The non-cogging MLL series of AC servomotors has no teeth in the stators, so there is no reluctance variation in the 360° motor rotation.
The absence of slots is claimed to improve motor performance because the magnetic flow is not modulated by stator teeth. As a result, ripple torque and current fluctuations are minimised.
Other advantages of non-cogging motors are the removal of eddy currents typically produced by stator teeth, which impact on torque and generate heat spot, while magnets do not have a preferential situation of static balance compared to classic stators with teeth.
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