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After starting the drive, relying on its salient pole synchronous motor torque and rotor remanence, after a short acceleration and asynchronous full-step process (about 1-2 seconds) into the synchronous operation state. Since this time synchronous motor excitation current, relying only salient pole rotor torque and remanence run, and thus the stator current is large, about 2-3 times the rated motor current.

With the acceleration of the motor, the rotor excitation generator armature winding induced voltage gradually increased, and when it is higher than the minimum operating voltage of the rectifier rotating, rotating rectifier control on the power source. Since this time the synchronous motor operates in synchronous operation state, the rotor angle of a small swing in the field winding induces a lower frequency voltage, which satisfies the cycle slip frequency criterion. Rotating rectifier after the voltage is detected, immediately triggered thyristor rectifier, the synchronous motor rotor field winding excitation current inputs. Since this time the motor speed is still low, the excitation generator armature voltage is low, and therefore the output of the synchronous motor excitation current low. After the input excitation, synchronous motor stator armature current will be reduced, with the acceleration of the motor, the excitation generator output voltage is gradually increased, synchronous motor excitation current obtained by gradually increasing the synchronous motor stator armature current decreases to below the rated current.

When the motor speed is increased to the minimum operating speed (speed range lower bound), the inverter notice exciter stator excitation generator excitation current is adjusted to the generator excitation maximum continuous operating excitation current (or rated field current), motor starting process complete, the motor can run at the speed of loading, or according to process needs to accelerate to the desired speed operation.

Since the above motor was short (which is typically about 30 seconds), and usually before starting field generator and synchronous motor winding temperature is not high, so this process does not lead to excitation generators and synchronous motors overheating.

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