Patent ID: 9329023
Filing Date: 2016-05-03
CPC Classification: G01B,G01R,H02P

Claim Text:
1. A rotation control apparatus comprising: a controller configured to supply test currents to a plurality of different paths of a motor including a stator having a plurality of coils and a magnetic rotor when the motor is stopped, the plurality of different paths including the plurality of coils; and a stop position detector including: the stop position detector determining an order of the detection voltages for the plurality of different paths and detecting a rotational position of the motor based on a combination of a path having a highest detection voltage and a path having a second-highest detection voltage in the order, wherein the controller is further configured to supply one of the test currents to flow through one of the plurality of different paths, measure a time taken until the corresponding detection voltage reaches a reference voltage, and set an electrical conduction time of the test currents based on a result of the measurement.