Patent ID: 6400118
Filing Date: 2002-06-04
Classification: H02P

Abstract:
A magnetic-pole position detecting apparatus for detecting position of a rotor of a synchronous motor comprising:a circuit unit which applies voltage vectors to an nth (where n is a natural number and at least 3 ) phase winding of a synchronous motor based on a voltage vector command; a detecting unit which detects currents on the nth phase winding generated by voltage vectors applied from the circuit unit; and an arithmetic unit which outputs the voltage vector command to the circuit unit, applies a trigger signal to the detecting unit immediately after an application of the voltage vectors based on the voltage vector command, so that the detecting unit detects currents on the nth phase winding, and calculates magnetic-pole positions of the synchronous motor based on the currents detected, and outputs the magnetic-pole positions calculated, wherein the arithmetic unit outputs to the circuit unit the voltage vector command for applying 2n kinds of voltage vectors with equal amplitudes and equal-interval phases to the nth phase winding over the same time period, and calculates and outputs magnetic-pole positions at every 60/(2k) degrees (where k is a natural number) based on the current in the phases detected by the detecting unit.