POWER CONVERTER, MOTOR, MOTOR DRIVE SYSTEM AND MAINTENANCE METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To suppress the deterioration of insulation between turns of a motor winding caused by a surge voltage generated in an inverter driven motor.

SOLUTION: For solving the problem, an optimum rising time is determined for suppressing partial discharge generated between the turns of the winding of the motor driven by an inverter from a relation between a rising time of the surge voltage and a surge-resistant voltage, and an optimum reactor capacity is determined from a relation between the rising time of the surge voltage and the inductance of an inserted reactor. The reactor having the optimum capacity is arranged between the inverter and the motor winding. The reactor may be the one only wound with wiring, an air-core reactor or the like.

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