Patent ID: 8217603
Filing Date: 2012-07-10
Classification: H02P

Abstract:
1. A rotary machine driving apparatus comprising: a power conversion circuit including switching elements and rectifying elements connected in parallel with the switching elements respectively to control connection of a power supply to a rotary machine; a drive control circuit for detecting a time point when an electrical angle of the rotary machine becomes equal to a predetermined electrical angle based on an induced voltage of the rotary machine and thereby set a specified time point providing a basis for operation of the switching elements, wherein the drive control circuit includes: a permitted period setting means for setting a permitted period for which detection of the predetermined electrical angle based on a detected value of a terminal voltage of the rotary machine is permitted; and a determining means for determining that a rotating state of the rotary machine is abnormal, when the number of times the predetermined electrical angle continuously occurs either ahead of or behind the permitted period becomes equal to or higher than a threshold value, under a condition that the rotary machine is in the rotating state.