Precautions for demagnetization of permanent magnet motor
Improved Design
1: Appropriate increase in the thickness of the permanent magnet
From the perspective of design and manufacture of permanent magnet synchronous motors, the relationship between armature response, electromagnetic torque and permanent magnet demagnetization should be considered.
Under the action of the magnetic flux generated by the torque winding current and the magnetic flux generated by the radial force winding, the rotor surface permanent magnet is liable to cause demagnetization.
In the case that the air gap of the motor is constant, the most effective way to ensure that the permanent magnet does not demagnetize is to appropriately increase the thickness of the permanent magnet.
2: There is a ventilation slot circuit inside the rotor to reduce the temperature rise of the rotor
An important factor affecting the reliability of permanent magnet motors is permanent magnet demagnetization.
If the temperature rise of the rotor is too high, the permanent magnet will produce irreversible loss of magnetism.
In the structural design, the internal ventilation circuit of the rotor can be designed to directly cool the magnetic steel. Not only reduces the temperature of the magnetic steel, but also improves the efficiency.
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