永磁电机铁芯比YE2异步电动机铁芯短10%,异步电动机采用的是2/3节距,永磁电动机为削弱转矩脉动采用的是5/6的节距比 2极转速多高? I suppose the reasons as follows
The high speed motor with 2 pole numbers has long end winding, and it reduces the stiffness of the rotor which can cause the vibration and noise.
Also, the long end winding can induce much copper loss and deteriorate the efficiency.
Thus, 4 pole numbers is always selected.
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