Patent ID: 9231510
Filing Date: 2016-01-05
CPC Classification: H02P

Claim Text:
1. A control device for rotary machine, comprising: a voltage instruction generation section for generating a voltage instruction; a voltage application section for applying voltage to a rotary machine based on the voltage instruction; a current detection section for detecting rotary machine current of the rotary machine; and an inductance calculation section for calculating an inductance of the rotary machine from the voltage instruction and the rotary machine current, wherein the voltage instruction generation section generates voltage instructions of constant DC voltages which are a first voltage instruction for inductance measurement preparation and a second voltage instruction for measurement, the voltage application section sequentially applies voltages to the rotary machine based on the first and second voltage instructions, and the inductance calculation section calculates the inductance from the voltage instruction for measurement arbitrarily selected from the voltage instructions, and the rotary machine currents detected by the current detection section before and after application of the voltage instruction for measurement.