1. The coil current density should not be too large or too small: the motor coil has a certain resistance. When the current passes through the coil, it will cause loss<br>When the winding temperature rises, the motor design hopes to reduce the resistance, so as to reduce the loss and improve the efficiency<br>Due to the increase of slot area, the magnetic density of the core increases, which makes the field current and iron density of the motor decrease<br>Generally, the induction motor J is 3 ~ 7a / mm 2 (the slot area is large, that is, the slot hole of the core is large when the chip is designed)<br>
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