What is a magnetic gear?
A magnetic gear (non-contact gear) is a gear-like transmission component without teeth that transmits rotational speed and torque between two shafts without physical contact, using the magnetic force (attraction and repulsion) generated by powerful permanent magnets such as neodymium magnets. Because power is transmitted without contact, it generates no dust and requires no lubrication, while also reducing noise and vibration—thereby overcoming the drawbacks of conventional gears that rely on tooth contact.
In addition, when excessive force is applied during power transmission, the magnetic gears slip relative to each other, allowing them to function as a torque limiter. Furthermore, since power can be transmitted through a non-magnetic barrier, it is possible to separate the environments of the driving side (motor side) and the driven side.
These features make magnetic gears particularly effective in applications such as cleanrooms, where dust generation and lubrication oils must be avoided, as well as in environments with stringent hygiene requirements.
Key Features of Magnetic Gears
Magnetic gears are non-contact power transmission devices that offer a range of unique advantages over conventional mechanical gears.
- Ultra-Low Noise and Vibration :
With no physical tooth contact, magnetic gears significantly reduce noise and vibration, enabling smoother and quieter operation. - Maintenance-Friendly Design :
Eliminating mechanical contact removes the need for lubrication, reducing maintenance requirements and associated downtime. - Particle-Free Operation :
The absence of frictional wear prevents the generation of particles, making magnetic gears ideal for clean and controlled environments. - Built-in Overload Protection :
Under excessive load, magnetic coupling naturally slips, functioning as an inherent torque limiter and helping protect connected equipment. - Through-Barrier Transmission :
Torque can be transmitted across non-magnetic barriers, allowing complete physical separation between drive and driven components—ideal for sealed or hygienic applications. - High Transmission Efficiency :
Optimized magnetic circuit design enables high efficiency, typically in the range of 90–95%, depending on operating conditions. - Tolerance to Misalignment :
Magnetic gears can accommodate a certain degree of shaft misalignment, offering greater flexibility in system design and assembly.
Applications of Magnetic Gears
Typical applications of magnetic gears include:
- Semiconductor manufacturing equipment
- Medical devices
- Food processing machinery