VEIM XIAMEN MOTOR MACH CO.LTD Language：中文版
What is the relationship between the vibration and noise of different types of motors and the air gap?
Release time: 2023-03-07
The air gap is an element that ensures the relative independence of the stator and rotor of the motor product in physical space, and is an important part of the magnetic circuit of the motor. The size and uniformity of the air gap directly affect the performance index of the motor product. From a theoretical analysis, the air gap of the motor is determined by the inner circle size of the stator punch and the size of the rotor after turning. The air gap size is given in the product design stage. When the air gap of the motor changes due to some factors , it will cause some performance indicators of the motor directly related to the air gap to change. When the air gap of the motor becomes larger, the stator and rotor harmonic leakage reactance and chute leakage reactance of the motor will decrease, and the reactance current will decrease, but the positive effect on the power factor is far less than the negative effect of the excitation current increase. At the same time, it also has a certain impact on the efficiency level of the motor. In addition, the size and uniformity of the air gap of the motor also have varying degrees of influence on the vibration and noise of the motor.
The air gap of the asynchronous motor is relatively small, and the size and uniformity of the air gap have a more obvious impact on the performance of the motor, while the permanent magnet synchronous motor has a larger air gap, so the relative error will be smaller, so the degree of influence on the performance of the motor is also Relatively smaller.
To solve this problem, we start with the analysis of the motor's bore failure. When the coaxiality or processing size of the motor parts does not meet the requirements, the stator and rotor will not be concentric after the motor is assembled. The final result is the motor's gas If the gap is uneven, it will lead to mechanical failure of the stator and the rotor in severe cases. When the motor has not yet reached the severity of bore sweeping, there is an obvious low-frequency electromagnetic sound after the motor is powered on, and the higher the voltage, the more serious the electromagnetic sound. In order to solve the problem of uneven air gap, it is necessary to strengthen the control of dimensional tolerance and coaxiality requirements of motor related parts. If necessary, it is necessary to adjust the relative uniformity of the air gap by correcting the motor air gap, but the final consequence is that the motor The overall air gap increases.
Compared with asynchronous motors, permanent magnet synchronous motors have a larger air gap, so the relative degree of air gap unevenness caused during the manufacturing process is generally smaller, so it will not have a great impact on its vibration and noise.
