Servo motor magnet is named according to the specific magnet application of servo motors. Servo motor applications are mostly commonly used in closed loop systems, where precise position control is commonly found in industrial and commercial applications. The servo motor utilizes a regular permanent magnet motor and couples it with a hall sensor for positional feedback.
According to the specific design of the servo motor rotor assembly, two different shapes of neodymium magnets are utilized. They are neodymium arc magnet and rectangular neodymium magnets. Nickel and epoxy are two most common coating types used in servo motor applications. Both coating types provide good corrosion resistance.
Another important consideration when choosing servo motor magnet is the maximum operating temperature of the designated servo motor. Engineers should be aware of the maximum temperature that the rotor magnets may experience in the extreme operating condition. Because neodymium magnets will demagnetize at certain temperature depending on the coercivity (coercive force Hcj). Common neodymium magnet grades for servo motor application are N33UH, N35SH, N35UH, N38SH, N38UH, N42UH, etc.
Different neodymium magnets can be used for servo motors, but they are not equal. Sintered neodymium magnets provide more power in less space than bonded neodymium ring magnets. However. the latter is compression molded and belongs to isotropic magnets. Therefore, bonded neodymium magnets are more flexible in shapes and magnetization patterns
Tengye Magnetic provides consultancy and technical support in servo motor magnets. We manufacture sintered neodymium magnets since 2014. We can also supply magnet rotor assemblies. Get in touch with us for your magnet inquiry.
