PURPOSE: To provide an electromagnetic pump driving power supply device which performs the wide range flow control including residual heat removing operation with variable-speed operation on high speed side at normal operation and performs the constant velocity operation on low speed side at residual heat removing operation, with an MG set composed of a number-of-poles converting motor.
CONSTITUTION: The driving power supply device of an electromagnetic pump 10 comprises an MG set 22, which is composed of a number-of-poles converting motor 22a and a synchronous motor 22b, a power source 8 for normal operation, which is connected to the high speed side of the number-of-poles converting motor 22a, a revolution controller 23 for a variable-voltage variable-frequency power source, which is supplied with power from the power source for normal operation, being connected to the synchronous generator, a coast down start switch 14, which operates by a coast down start signal and a high-speed and low-speed changeover signal, a power source 11 for residual heat removing operation, and a residual heat removing operation switch 24, which operates by the coast down signal and a coast down taking-over signal, being connected on the low speed side.
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