In order to improve the quality of the motor, in recent years, the motor noise has been included in one of the quality assessment indexes, especially for the motor operating environment with close contact with people, the motor noise has become a very important assessment requirements.
In order to control the asynchronous motor noise, in addition to the design of the stator and rotor slot with the appropriate selection of the stator and rotor slot with the exception of the use of oblique grooves can be used in order to reduce the electromagnetic noise of the motor. But exactly how much slot slope is more appropriate, it is necessary to further test and verify.
In general, asynchronous motor rotor slot slope can be taken as a stator pitch, can also basically meet the requirements. But in order to further improve the motor noise, need to explore the best slot slope, which requires a lot of calculation and verification.
From the manufacturing point of view of analysis, straight slot motor production and processing to be relatively simple, but when necessary, it will need to be the stator slot or rotor slot torsion. The stator slot torsion is relatively difficult, and therefore, in most cases, the rotor slot tilting. Rotor slot torsion generally through the shaft machining torsion of the keyway to achieve, the more advanced equipment enterprises, the use of spiral punching, in the rotor core manufacturing process to achieve.
