What factors can affect the iron loss of a motor?
Factors can affect the iron loss of a motor
TECHNICAL ARTICLES
Many factors can affect the iron loss of a motor.
1. Magnetic induction intensity. Generally, the higher the magnetic induction intensity of a motor, the higher its iron loss.
2. The frequency of magnetic field changes is directly proportional to the eddy current losses of the motor and the exponent of the frequency of magnetic field changes. Therefore, the higher the alternating frequency, the higher the iron loss of the motor.
3. Stress, especially compressive stress, increases the area of the hysteresis loop of the iron core and increases hysteresis loss.
4. Temperature, which can decrease the conductivity of the iron core, can to some extent reduce the eddy current loss of the iron core.
5. The skin effect causes the eddy current of the motor to only exist on the surface of the steel sheet, thus reducing the eddy current loss of the motor to a certain extent.
6. A small hysteresis loop is formed in the iron core of the motor when we modulate it with PWM. These small hysteresis will also increase the hysteresis loss of the motor.
7. DC bias. When calculating a switched reluctance motor, we will find that the magnetic field in its core is an alternating magnetic field with DC bias, which increases the difficulty of calculating the motor's iron loss.
8. Processing methods, such as laser cutting, have the greatest impact on the wear of the motor body, followed by electric discharge cutting. The impact of waterjet cutting on the iron wear of the motor core can be almost negligible.