1, hub motor rotor of the stepper motor acceleration is slower than the rotating magnetic field, that is lower than the phase velocity change arising. This is because the lack of input electrical power, generated in the stepper motor torque can not make synchronous rotor speed to follow the stator magnetic field rotation rate, causing loss of step. And any high frequency than when the frequency is bound to work out of step. This illustrates the step-step motor drag is not enough. Once the reduced load, or increase the winding excitation current, it is possible to overcome the loss of step.
2, hub motor rotor speed is higher than the average of the average rotation speed of the stator magnetic field. Then the stator excitation power for longer periods, than the time required for the rotor step further, the rotor step process to get too much energy, resulting in pediment and the backlash of the swing oscillations. When severe enough to cause oscillation of step.
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