Magnetic Couplings

magnetic power transmission through barrier

Non-Contact Magnetic Couplings Enable Clean, Quiet, and Safe Power Transmission

No particle generation from tooth surface wear
Barrier transmission allows for seal-less designs
Low noise and vibration due to non-contact power transmission
Easier assembly with high angular and eccentric misalignment tolerance
Magnetic slip under overload enhances safety conditions
Vibration Transmission Reduction
Reduced Heat Transfer

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What Is a Magnetic Coupling? – How It Works

Conventional Couplings vs Magnetic Couplings

Conventional couplings and magnetic couplings are products with different characteristics and functions, and are not intended to be compared simply in terms of which is better or worse. Each is suited to different applications and operating environments, so it is important to select the appropriate type based on the required performance.

Comparison	Conventional Couplings	Magnetic Couplings
Torque Transmission	Torque is transmitted through mechanical connection between components.	Torque is transmitted without physical contact using magnetic force.
Wear & Particle Generation	Wear and wear particles may occur at contact points.	No contact wear or wear particles are generated in the torque transmission section.
Lubrication	Lubrication may be required depending on the type.	No lubrication is required in the torque transmission section.
Noise & Vibration	Vibration can be transmitted through mechanical contact.	Non-contact transmission helps reduce the direct transmission of noise and vibration.
Misalignment	Must be used within the allowable misalignment range of the coupling.	Non-contact transmission provides greater tolerance for certain types of misalignment.
Torque Transmission Across a Barrier	A rotating shaft must pass through the barrier, typically requiring a shaft seal.	Torque can be transmitted without contact across a non-magnetic barrier.
Overload	Excessive loads may be applied to the coupling or surrounding components.	Magnetic slip occurs when the maximum transmissible torque is exceeded, helping limit the transmission of excessive torque.
Positioning	Some types are suitable for high-precision positioning.	Lost Motion occurs depending on the transmitted torque, so careful consideration is required for high-precision positioning applications.
Typical Applications	General power transmission applications.	Applications requiring clean operation, sealed structures, low noise and vibration, or overload protection.

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Potential Applications by Industry

Semiconductor Manufacturing Equipment Industry
Robotics Industry
Medical Device Industry
Food Processing Machinery Industry

Magnetic Coupling Lineup

Cylindrical and Disc-Type Magnetic Couplings

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Versatile Standard Magnetic Couplings

Unless your application has special requirements, Cylindrical and Disc-Type Magnetic Couplings are a practical standard option to consider first. Because torque is transmitted without physical contact, there is no contact wear or particle generation. They require no shaft seal and can also transmit power across a barrier. Other key advantages include low noise and vibration, as well as tolerance for a certain degree of misalignment. A wide range of cylindrical and disc-type models is available to suit different applications and installation requirements. They are suitable for a broad range of applications, from general power transmission that requires no special specifications to equipment where cleanliness and ease of maintenance are important. As standard products, they also offer the advantages of easy selection and short lead times. Even for first-time users of magnetic couplings, an appropriate model can be selected according to the application and required torque.

Cylindrical Coaxial Magnetic Couplings

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Reduced Axial Thrust

Magnetic couplings transmit power without physical contact, eliminating contact wear and particle generation while requiring no lubrication. They can also transmit torque across a barrier and provide a torque-limiting function by slipping magnetically under overload. In conventional magnetic couplings, the magnets on the input and output sides typically face each other in the axial direction. The magnetic force acting between them can therefore generate axial thrust. In contrast, Cylindrical Coaxial Magnetic Couplings feature a coaxial structure in which an outer cylinder with magnets on its inner surface surrounds an inner cylinder with magnets on its outer surface. This structure utilizes the magnetic interaction primarily in the radial direction, reducing the magnetic force acting in the axial direction and thereby minimizing axial thrust. Reducing axial thrust helps decrease the load on bearings and can simplify additional structures that would otherwise be required to accommodate thrust loads.

Cylindrical Coaxial Structure for Higher Torque and Smaller Diameters

Another advantage of the cylindrical coaxial structure is that it makes it easier to achieve higher torque while maintaining a smaller diameter. With conventional magnetic couplings, increasing transmissible torque may require a larger magnet arrangement diameter, resulting in a larger overall diameter. With Cylindrical Coaxial Magnetic Couplings, although factors such as loads on shafts, bearings, and supporting structures must also be considered, the radially arranged magnets can be extended in the axial direction to increase transmissible torque without increasing the coupling diameter. This makes it possible to achieve compact designs capable of transmitting high torque even in machines and equipment where radial space is limited.

Sealed Magnetic Couplings

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Non-Contact Power Transmission Across a Barrier

One of the major advantages of magnetic couplings is their ability to transmit power without physical contact across a barrier. In applications where the driven component operates in environments such as water or chemical solutions, it may be necessary to isolate the motor or other power source from the driven component. In such cases, power must be transmitted across a barrier. Provided that conditions such as the material and thickness of the barrier are suitable, magnetic couplings can transmit power without physical contact through magnetic force, without requiring a shaft to penetrate the barrier. By using a non-magnetic material that does not significantly interfere with the magnetic field, the magnets on both sides of the barrier can remain magnetically coupled and transmit power through the barrier. Because no shaft penetration through the barrier is required, a seal around a rotating shaft is unnecessary. This helps prevent leakage of liquids or gases while keeping the power source isolated from the driven component. This structure is particularly suitable for applications requiring a high degree of isolation that can be difficult to achieve with conventional mechanical sealing arrangements.
To fully benefit from power transmission across a barrier, however, the magnetic coupling itself must also be able to withstand the operating environment. Even if the barrier isolates the power source from the driven component, the advantages of this configuration cannot be fully realized if the magnetic coupling itself cannot withstand exposure to water, chemicals, or other environmental conditions. Our Sealed Magnetic Couplings are available with resin (PVC) covers for acidic environments and stainless steel (SUS) covers for underwater applications. Both use non-magnetic cover materials, enabling non-contact power transmission through magnetic force across the cover. We also offer custom-designed covered magnetic couplings tailored to customers' specific operating environments and performance requirements.

SmoothSlip Magnetic Coupling

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Reducing Jerky Motion During Slip

One of the major advantages of magnetic couplings is their torque-limiting function. When a load exceeding the coupling's maximum transmissible torque is applied, for example due to jamming, a large phase shift occurs between the magnets on the input and output sides, causing the coupling to slip. This torque-limiting function helps prevent excessive load torque from being transmitted back to the input side, protecting the motor and drive mechanism from overload.
However, another issue can arise while the coupling is slipping. During slip, repeated magnetic attraction and repulsion between the magnets can cause jerky motion, resulting in vibration and noise. For machines that utilize the torque-limiting function of magnetic slip, it is therefore important to reduce this jerky motion during slip. The SmoothSlip Magnetic Coupling addresses this issue by using a hysteresis material to produce smoother slipping behavior. With a hysteresis-based system, the magnetization state of the hysteresis material changes in response to changes in the surrounding magnetic field, and torque is transmitted through magnetic hysteresis. This helps reduce the abrupt torque fluctuations that can occur in couplings using permanent magnets on both sides. As a result, even when slip occurs, the coupling can slip smoothly while minimizing torque fluctuations. In other words, the SmoothSlip Magnetic Coupling retains the inherent torque-limiting benefit of a magnetic coupling—slipping under overload to protect the machine—while reducing the jerky motion that can otherwise occur during slip.

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Key Features of Magnetic Couplings

No particle generation caused by tooth surface wear

No particle generation from contact surfaces

In conventional couplings, mechanical contact between components can generate minute wear particles over time. In applications requiring high levels of cleanliness, such as semiconductor manufacturing equipment, these particles can become a source of contamination and may affect equipment performance and product quality.
In contrast, magnetic couplings transmit power through magnetic force without physical contact, eliminating mechanical wear and the resulting wear particles. This makes them particularly suitable for cleanrooms and other applications requiring high levels of cleanliness.

Barrier transmission enables seal-less structures

A mixer with a separated drive system that enables quick and easy agitator removal for cleaning and maintenance

Achieves a seal-less design through non-contact power transmission across a barrier

Magnetic couplings transmit torque without physical contact between the input and output sides. This allows power to be transmitted through a non-magnetic barrier made of materials such as resin or stainless steel, eliminating the need for a shaft to penetrate the barrier and enabling a hermetically sealed, seal-less structure without conventional sealing mechanisms. This makes magnetic couplings particularly suitable for pumps and other equipment where leakage prevention and isolation of the driven system are important. For example, in food processing equipment, power can be transmitted without contact from a motor located outside a sealed container to a mixing mechanism inside. This can help reduce contamination risks and improve cleanability. Power can also be transmitted into containers holding liquids without requiring through-holes, helping reduce the risk of leakage and simplify equipment design. The transmissible torque varies depending on factors such as the gap between the coupling halves and the material and thickness of the barrier. These factors should therefore be considered during the design process.

Low Noise and Vibration Through Non-Contact Power Transmission

In mechanical design, reducing vibration and noise in drive systems is an important challenge that directly affects machine performance and added value. Conventional couplings transmit power through mechanical contact, and depending on the coupling design and operating conditions, this contact may contribute to vibration and noise.
In contrast, magnetic couplings transmit power through magnetic force without physical contact between the input and output sides. As a result, vibration and noise associated with mechanical contact can be reduced, enabling quieter and smoother operation compared with conventional mechanical couplings.
This characteristic makes magnetic couplings an effective option for applications where low noise, low vibration, and stable operation are important requirements.

Easier assembly with high angular and eccentric misalignment tolerance

Tolerant of parallel and angular misalignment

Conventional mechanical couplings transmit power through mechanical contact between the input and output sides, requiring proper alignment and assembly. Accurate shaft alignment is important, as excessive angular, parallel, or axial misalignment can lead to increased wear, vibration, noise, and even reduced service life of the coupling and surrounding mechanical components.
In contrast, magnetic couplings transmit torque without physical contact and can tolerate a certain degree of angular, parallel, and axial misalignment, making assembly and maintenance easier. However, if the air gap between the input and output sides becomes too large, the transmissible torque decreases and loss of synchronization (slip) may occur.

Torque Limiting Function Under Overload Conditions

Magnetic couplings feature a torque limiting function based on non-contact power transmission using permanent magnets. During normal operation, torque is transmitted synchronously between the input and output shafts through magnetic force. When the load exceeds the transmissible torque, however, slip occurs between the input and output sides, limiting the transmission of excessive torque.
This helps reduce the load on the motor and surrounding mechanical components in the event of an overload caused by sudden stoppage, foreign object intrusion, or similar conditions.
In addition, because the magnetic coupling itself functions as a torque limiter, there is no need for a separate mechanical torque limiter, helping reduce the number of components and simplify the overall system design.

Vibration Transmission Reduction

With conventional couplings, the input and output sides are physically connected, so vibrations generated on the input side may be directly transmitted to the output side. In contrast, magnetic couplings transmit power without physical contact, with an air gap between the input and output sides. As a result, vibrations generated on the input side are less likely to be transmitted directly to the output side, helping reduce vibration transmission.

However, if the input and output sides are mechanically connected through another path, such as a common base or housing, vibrations may still be transmitted through that path.

Reduced Heat Transfer from the Input Shaft

As shown on the left side of the illustration, with a conventional coupling, the input and output shafts are physically connected through the coupling. Therefore, heat generated on the input side can be directly transferred to the output side. This heat transfer may become an issue in applications where equipment or workpieces connected to the output shaft require precise temperature control.

In contrast, as shown on the right side of the illustration, a magnetic coupling transmits power magnetically without physical contact between the input and output sides. Since an air gap exists between them, direct heat transfer from the input side to the output side can be reduced. This feature is beneficial for applications where the thermal influence on the output side needs to be minimized. Furthermore, when power is transmitted through a barrier placed between the input and output sides, an even higher degree of thermal isolation can be achieved.

Long-Lasting Magnetic Performance

Magnets are often thought to lose their magnetic strength over time; however, the demagnetization of the magnets used in our magnetic couplings is extremely small. According to our data, the maximum rate of demagnetization is only 0.1% per year, resulting in a magnetic strength reduction of only about 1% even after 10 years.

As a result, the effect on transmitted torque is negligible, allowing stable power transmission over long periods of operation. In addition, the need for replacement or adjustment due to performance degradation is minimized, helping to reduce maintenance requirements and lower the total cost of ownership (TCO).

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Working Principle of Magnetic Couplings

Magnetic couplings differ from conventional couplings in that they transmit power without physical contact between the input and output sides. Instead, they utilize the magnetic force generated by permanent magnets, such as neodymium magnets, to transmit power.
The following sections explain the basic operating principles of magnetic couplings while introducing the key technical terms needed to understand how they work.

1. Torque Transmission Mechanism

For simplicity, the following explanation uses a simplified model of a magnetic coupling.
A magnetic coupling consists of a pair of rotors with alternating north (N) and south (S) magnetic poles arranged around their circumference. These magnetic poles interact with each other across an air gap, generating attractive forces between opposite poles and repulsive forces between like poles. As the input rotor rotates, these magnetic forces transmit torque to the output rotor, allowing both rotors to rotate synchronously without any physical contact.

Examples of magnetic gears magnetized with 12 poles

2. Synchronous Rotation

Magnetic couplings normally use the same number of magnetic poles on both the input and output rotors. As a result, the input and output rotors rotate synchronously at a 1:1 speed ratio.
When torque is applied, a phase difference (lost motion), as described later, develops between the two rotors. This phase difference enables torque to be transmitted while maintaining synchronous rotation.
If the transmitted torque exceeds the maximum transmissible torque of the magnetic coupling, the two rotors lose synchronization and slip relative to each other. This slip characteristic can be utilized to help protect machinery from overload.

3. Air Gap

In magnetic couplings, the transmissible torque depends on the size of the air gap (the distance between the magnetic poles on the input and output sides). As the air gap increases, the magnetic flux density within the air gap decreases, weakening the magnetic interaction (attractive and repulsive forces) between the input and output sides. As a result, the transmissible torque also decreases.
Therefore, when using a magnetic coupling, it is important to maintain an appropriate air gap, taking into account factors such as the required transmissible torque and assembly tolerances.

4. Lost Motion

What Is Lost Motion?

In magnetic couplings, Lost Motion refers to the phase difference (rotational displacement) that occurs between the input and output sides. When torque is transmitted through a magnetic coupling, a phase difference develops between the input and output sides according to the applied load torque. This phase difference generates a magnetic restoring torque (a torque that acts to return the phase difference to zero), and this restoring torque is what enables torque transmission.

Zero Phase Difference

Please refer to Figure 1.
For simplicity, the following explanation uses a simplified 8-pole model. In the stationary state (zero torque), the input-side S pole and the output-side N pole, highlighted by the red circles, are directly aligned with each other, resulting in a phase difference of 0°. At first glance, it may seem that this 0° phase difference represents the strongest magnetic coupling and therefore the maximum torque transmission. In reality, however, this is not the case. As explained above, magnetic couplings transmit torque by generating a phase difference between the input and output sides under load. This phase difference creates the magnetic restoring torque required for torque transmission. In other words, when the phase difference is 0°, no magnetic restoring torque is generated, and therefore no torque is transmitted.

Relationship Between Phase Difference and Transmitted Torque

Please refer to Figure 2.
For simplicity, the magnetic pole geometry and magnetic flux distribution have been simplified in this illustration. In this 8-pole model, one pole pitch corresponds to 45° (360° ÷ 8). As the load torque increases, the phase difference gradually increases from 0°. The input-side magnetic pole (the S pole highlighted by the red circle) gradually moves away from the opposite output-side N pole, while simultaneously approaching the adjacent output-side S pole. As a result, the attractive force between opposite poles and the repulsive force between like poles act simultaneously. The combination of these forces produces a magnetic restoring torque that acts to reduce the phase difference. In this simplified 8-pole model, when the phase difference reaches approximately 22.5°, which is half of one pole pitch (45°), the combined rotational effect of the attractive and repulsive forces becomes greatest, producing the maximum magnetic restoring torque. Consequently, the maximum transmissible torque is achieved at approximately 22.5°. If the load torque increases further, synchronous rotation can no longer be maintained, causing the input and output sides to lose synchronization and resulting in pole slip (loss of synchronism).

Points to Consider Regarding Lost Motion

During actual operation, the phase difference continuously changes in response to variations in load torque. As a result, a certain amount of phase difference may always exist between the input and output sides of a magnetic coupling. For applications requiring high positioning accuracy or precise synchronization, the effects of Lost Motion should be carefully considered.

Summary

Lost Motion is the phase difference (rotational displacement) between the input and output sides.
Magnetic couplings transmit torque by utilizing the magnetic restoring torque generated by this phase difference.
As the load torque increases up to the maximum transmissible torque, both the phase difference and the corresponding magnetic restoring torque increase.
In the simplified 8-pole model presented here, the maximum transmissible torque is reached at a phase difference of approximately 22.5°.
If the load torque exceeds the maximum transmissible torque, pole slip (loss of synchronism) occurs.
For applications requiring high positioning accuracy, the effects of Lost Motion should be taken into account.
Lost Motion is an inherent operating characteristic of magnetic couplings that occurs as torque is transmitted.

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Potential Applications of Magnetic Couplings by Industry

Cleanroom Conveying System

Semiconductor Manufacturing Equipment Industry

1. Particle Generation and Contamination Control

Potential Challenge:
In semiconductor manufacturing, microscopic particles such as wear debris from mechanical components, as well as lubricant mist, can reduce production yield.

Solution:
Magnetic couplings transmit torque without physical contact, eliminating wear particles from contact surfaces. They provide clean power transmission and help improve production yield by reducing particle generation.

2. Reduced Maintenance and Downtime

Potential Challenge:
Wear of mechanical components and periodic maintenance of shaft seals can result in equipment downtime and reduced productivity.

Solution:
Because magnetic couplings transmit torque without physical contact between the input and output sides, wear associated with direct mechanical contact can be reduced. In addition, power can be transmitted through a barrier, enabling seal-less designs that eliminate the need for dynamic shaft seals. These characteristics can help reduce maintenance requirements and equipment downtime while lowering total cost of ownership (TCO).

3. Support for Vacuum and Sealed Processes

Potential Challenge:
In vacuum chambers and special gas environments, leakage through rotary shaft seals and outgassing can become issues.

Solution:
Magnetic couplings can transmit torque across a barrier without physical contact, eliminating the need for a rotating shaft to penetrate the barrier. This helps maintain a high level of airtightness and improves the reliability of vacuum equipment and sealed processes.
The feasibility of non-contact torque transmission and the transmissible torque depend on factors such as the material and thickness of the barrier.

Robotics Industry

1. Wear and Maintenance

Potential Challenge:
Continuous operation of robots can lead to wear of drive components, requiring component replacement and other maintenance work.

Solution:
Since magnetic couplings transmit torque without physical contact between the input and output sides, wear associated with direct mechanical contact can be reduced. This can help reduce maintenance requirements associated with wear.

2. Damage Caused by Collisions and Overloads

Potential Challenge:
If a robot collides with a workpiece or surrounding equipment, or is subjected to an unexpected overload, drive components such as motors, reducers, and gears may be damaged.

Solution:
When the maximum transmissible torque is exceeded, the magnetic poles can slip relative to each other without mechanical contact. This helps limit excessive torque from being transmitted to surrounding drive components, reducing the risk of damage.

3. Vibration and Noise

Potential Challenge:
Vibration and noise generated by motors and drive mechanisms can be transmitted to the robot itself and surrounding equipment, affecting quiet operation and equipment performance.

Solution:
Since the input and output sides of a magnetic coupling are not physically connected, direct vibration transmission from the input side to the output side can be reduced compared with conventional mechanical couplings. In addition, the absence of mechanical contact between the input and output sides can help reduce vibration and noise associated with mechanical contact.

Medical Device Industry

1. Reduced Maintenance and Downtime

Potential Challenge:
Medical devices may require periodic replacement of worn components and maintenance of shaft seals, which can result in increased equipment downtime and higher maintenance costs.

Solution:
Magnetic couplings transmit torque without physical contact between the input and output sides, helping reduce wear associated with direct mechanical contact. In addition, power can be transmitted through a barrier, enabling seal-less designs that eliminate the need for dynamic shaft seals. These characteristics can help reduce maintenance requirements, improve equipment uptime, and lower the total cost of ownership (TCO).

2. Improved Cleanliness and Hygiene

Potential Challenge:
Medical devices require a high level of hygiene. The generation of wear particles may increase the risk of contamination and add to the burden of cleaning and sterilization.

Solution:
Because magnetic couplings transmit power without physical contact between the input and output sides, wear particle generation associated with direct mechanical contact can be reduced. As a result, they provide clean power transmission and can contribute to improved hygiene and cleaner operation of medical devices.

3. Quieter and Lower-Vibration Operation for a More Comfortable Medical Environment

Potential Challenge:
In hospital rooms, examination rooms, and consultation rooms, noise and vibration from medical equipment may affect patient comfort and the working environment for healthcare professionals.

Solution:
Because magnetic couplings transmit power without physical contact between the input and output sides, vibration and noise associated with mechanical contact can be reduced. They can contribute to a more comfortable medical environment while also supporting the stable operation of precision equipment.

Food Processing Machinery Industry

1. Reducing the Risk of Product Contamination

Potential Challenge:
In food processing, wear particles generated by mechanical components can become sources of product contamination, potentially leading to reduced product quality and product recalls.

Solution:
Magnetic couplings transmit torque without physical contact between the input and output sides, helping reduce wear particle generation associated with direct mechanical contact. This can help reduce the risk of product contamination caused by wear particles, contributing to a cleaner food processing environment.

2. Reducing Cleaning and Maintenance Workload and Minimizing Downtime

Potential Challenge:
Food processing equipment requires frequent cleaning to maintain a high level of hygiene, which can increase equipment downtime. In addition, equipment shutdowns caused by component wear and periodic replacement can reduce productivity and increase maintenance costs.

Solution:
Magnetic couplings can transmit torque through a barrier, making it possible to achieve a sealed product-side structure. In addition, because torque is transmitted without physical contact between the input and output sides, wear associated with direct mechanical contact can be reduced. These characteristics can help improve cleanability and hygiene while reducing maintenance workload, increasing equipment uptime, and lowering the total cost of ownership (TCO).

3. Reducing the Risk of Equipment Damage Caused by Overload

Potential Challenge:
In food processing equipment, products or foreign objects may become jammed, or sudden load fluctuations may occur, resulting in excessive loads being applied to drive components such as gears and motors. As a result, components may be damaged, equipment may stop unexpectedly, and repair costs may increase.

Solution:
When the applied load exceeds the maximum transmissible torque, magnetic couplings can slip magnetically, limiting the transmission of excessive torque. This helps reduce the risk of damage to drive system components, protecting equipment and preventing unexpected downtime.

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FAQ

Q.
Are there any official or widely recognized product standards for magnetic couplings?
A.
No such product standards have been identified. However, individual manufacturers offer standard products with their own specifications for dimensions, shapes, functions, transmissible torque, air gap, and other parameters.

Q.
What is the maximum operating speed of KHK magnetic couplings?
A.
Although no specific maximum operating speed is defined, as a general guideline, KHK MOTION DRIVES standard magnetic couplings can typically be used at speeds of approximately 3,000 rpm.
However, the allowable operating speed varies depending on operating conditions, such as temperature, and this figure is therefore not guaranteed.
If you provide us with details of your operating environment and conditions, we can evaluate your application individually.

Q.
Is the performance of magnetic couplings affected by the ambient temperature?
A.
Yes. The transmissible torque of magnetic couplings varies depending on the ambient temperature and generally decreases as the temperature increases. The maximum operating temperature of our standard magnetic couplings is 80°C.

Q.
Can magnetic couplings be used for precise positioning applications?
A.
During power transmission with magnetic couplings, Lost Motion occurs depending on the transmitted torque. (For more information, please see the “Lost Motion” section on this page.) Therefore, magnetic couplings may not be suitable for high-precision positioning applications. Please contact us to discuss the suitability for your application.

Q.
Can magnetic couplings transmit higher torque than conventional couplings?
A.
No. In general, conventional couplings that physically connect the driving and driven shafts can transmit higher torque. If the torque applied to a magnetic coupling exceeds its maximum transmissible torque, the coupling will lose synchronization (slip). On the other hand, magnetic couplings offer various advantages that conventional couplings do not. The important point is not which type is better, but to understand the characteristics of each and select the appropriate coupling for the application.

Q.
How much torque can a magnetic coupling transmit?
A.
The transmissible torque varies depending on factors such as the size and type of magnets used. For standard products, the transmissible torque is specified for each product. Please refer to the individual product pages or PDF catalog for details. For custom products, please contact us for further information.

Q.
Can magnetic couplings be used in environments where magnetic fields are present?
A.
If magnetic fields are present in the operating environment, they may affect the magnetic coupling between the driving and driven sides, potentially impairing torque transmission or rotational synchronization. If you have any concerns, please check the strength of the magnetic field and consult us in advance.

Q.
What materials can be used for a barrier when transmitting torque through a barrier with magnetic couplings?
A.
The barrier should be made of a non-magnetic material that does not significantly interfere with magnetic torque transmission. For metallic barriers, non-magnetic stainless steel can be used. If aluminum or copper is used, please consult us in advance, as these materials may affect product performance depending on the operating conditions. For non-metallic barriers, materials such as plastic and glass can be used.

Q.
What happens if the air gap (mm) between the magnetic couplings is increased?
A.
As the air gap increases, the magnetic coupling between the two sides becomes weaker, resulting in a decrease in transmissible torque. For standard products, data showing the relationship between the air gap and transmissible torque is available for each product. Please refer to the individual product pages or PDF catalog for details.

Q.
Do magnetic couplings experience demagnetization over time?
A.
Yes. Some demagnetization occurs over time, but under normal operating conditions, it is approximately 0.1% per year.

Q.
What is the lead time for magnetic couplings?
A.
For standard products that are in stock, the lead time from order placement to shipment is approximately 2–3 weeks. For custom products and other cases, please contact us for lead time information.

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