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Influence of thickness, width and chamfering of magnetic steel on motor performance

There are many factors that affect the operation of the motor, among which magnet (magnet steel) is also a very important one. Today I will tell you that the thickness, width and chamfering of the magnet steel have little effect on the performance of the motor.

1. Influence of magnetic steel thickness on motor performance
When the inner or outer magnetic circuit is fixed, when the thickness increases, the air gap decreases, and the effective magnetic flux increases. The obvious performance is that under the same remanence, the no-load speed decreases, the no-load current decreases, and the maximum efficiency of the motor increases. However, there are also disadvantages, such as the increase of commutation vibration of the motor, the efficiency curve of the motor is relatively steep. Therefore, the thickness of the motor magnetic steel should be as consistent as possible to reduce vibration.

2. The influence of the width of magnetic steel on the performance of motor
For the BLDCM magnet with dense row distribution, the total accumulated clearance shall not exceed 0.5mm. If it is too small, it will not be able to be installed. If it is too small, it will lead to motor vibration and efficiency reduction. This is because the position of Hall element measuring the position of magnet steel does not correspond to the actual position of magnet steel, and the consistency of width must be ensured, otherwise, the efficiency of motor is low and vibration is large.
For the brush motor, there is a certain gap between the magnets, which is left for the mechanical reversing transition area. Although there is a gap, most manufacturers have strict installation procedures to ensure the installation accuracy of the motor magnet in order to ensure the accuracy of the installation position. If the width of the magnetic steel exceeds, it will not be installed; if the width of the magnetic steel is too small, it will cause the magnetic steel positioning misalignment, increase the vibration of the motor and reduce the efficiency.

3. Does the chamfering size and non chamfering of magnet steel affect the motor performance?
If not chamfered, the change rate of the magnetic field along the magnetic field edge of the motor is large, which causes the motor pulse vibration. The larger the chamfering is, the smaller the vibration is. However, chamfering generally has a certain loss of magnetic flux. For some specifications, when chamfering to 0.8, the loss of magnetic flux is 0.5-1.5%. When the residual magnetism of the brush motor is low, it is beneficial to compensate the residual magnetism by properly reducing the chamfering size, but the pulse vibration of the motor increases. Generally speaking, when the remanence is low, the tolerance of the length direction can be properly enlarged, which can improve the effective flux to a certain extent and make the performance of the motor basically unchanged.

The above is about the influence of the thickness, width and chamfering of the magnetic steel on the performance of the motor. The content of this paper comes from the integration of network information. Welcome to consult and quote for the magnetic steel of the motor if necessary.

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