Patent ID: 8314579
Filing Date: 2012-11-20
Classification: B60L,H02P,Y02T

Abstract:
1. A sensorless motor control device comprising: a magnetic pole position estimating unit that does not use a sensor to detect a magnetic pole position of a motor having a salient rotor, and overlays a high-frequency current on the motor to estimate the magnetic pole position of the rotor of the motor; and a high-frequency current control unit for changing a magnitude of the high-frequency current based on a magnitude of one of a torque or a current of the motor, wherein the high-frequency current control unit includes a high-frequency generating unit for generating a high-frequency current signal; a table that is a collection of current level specification data that correspond to each value of one of the torque or the current of the motor; and a unit for generating the high-frequency current by amplifying the high-frequency current signal to a level specified by the current level specification data in the table that corresponds to one of the present torque and current.