Starting Process Research Of Wound-Rotor Permanent Magnet Synchronous Motor

Nowadays, reducer-asynchronous motor system is widely used in the drive of cranes.The characteristic of cranes is frequently starting under the heavy load, while mostlyrunning under the light load; the rate of average load is low. The asynchronous motor’sefficiency reduces along with load rate decrease. The crane’s total efficiency is low.Permanent Magnet Synchronous Motor (PMSM) has the character of high power factorand efficiency, and both of them are irrelevant to load rate. But Squirrel cage Line-startPermanent Magnet (Squirrel cage LS-PMSM) can’t be connected to rotor externalresistance, so difficult to apply to crane. In addition, with the starting system of switchinggradually the rotor external resistance, the motor will produce an impact torque, whichshould be avoided for security. So PWM chopper regulation of fixed value resistance inWR LS-PMSM has theoretical significance and practical engineering value.Comparative analysis shows that connecting rotor external resistance in rotor-sidecontributed to reduce starting current and improve starting torque, which has a betterstarting performance than Squirrel cage LS-PMSM. WR LS-PMSM as the crane’s drivingnot only improves the efficiency, but also has a stable start. Furthermore, due to thecongenital advantage of PMSM, WR LS-PMSM has more superiority to be the drivesystem of the crane.This paper mainly does the torque analysis for wound rotor of permanent magnetsynchronous motor starting process, established the mathematical model of the process ofstarting, according to the mathematical model of wound rotor permanent magnet motor hascarried on the matlab simulation analysis, and contrasted the cage rotor permanent magnetmotor, design the hardware circuit of motor starting control.