The advantages and disadvantages of three phase type PM stepping motor

1. Advantages: (1) a resolution of 1 the PM motor. More than 5 times. (2) the vibration and noise than two phase PM motor or two phase HB. (3) high-speed torque is bigger than two phase PM motor. (4) is much cheaper than HB type. (5) of three-phase motor driver advantage is only 6 power tube driver. 2. Disadvantages: more complicated than the structure of the PM motor.
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