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Servo motor magnet

Permanent magnet materials are commonly used as rotors for servo motors.

The driving of the three phase power source controls the electromagnetic field, and the rotor rotates under the action of the magnetic field, and the motor sends a feedback signal to the encoder to drive the driver according to the feedback value and the target value to adjust the rotation angle of the rotor. Depends on servo motor encoder accuracy (number of lines)

Servo motor rotor magnet

AC servo brushless motors are also divided into synchronous motors and asynchronous motors. Motion control generally uses synchronous motors, which can do a lot of power in a high power range. The inertia is large, the maximum speed is low, and it decreases rapidly with the increase of power, so it is suitable for running low speed applications.

The most widely used magnetic materials in electric motors are sintered NdFeB materials and SmCo materials. The sintered NdFeB magnet has a large magnetic field strength and can bring a large torque to the rotor and the stator. In the sintered NdFeB grade, the H, SH, EH and UH series are used more because they can withstand operating temperatures of up to 120-200 degrees Celsius without losing magnetism.

However, since a considerable number of motors are used at higher temperatures working environment, Samarium Cobalt magnets have a magnetic strength comparable to that of sintered Neodymium magnet, and their maximum operating temperature is 250-300 degrees Celsius. Therefore, the use of SmCo magnets is also widely used in motor.

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