The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2019
Filed:
Jun. 27, 2016
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Takuro Kanazawa, Tokyo, JP;
Kimihisa Furukawa, Tokyo, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
Magnetic flux generated when a current flows through a main circuit wiring serves as disturbance of a magnetic sensor, and accurate rotor position information is obtained. A motor drive apparatus controls an operation of a power conversion device outputting a current to an AC motor on the basis of a desired torque command value, and includes a main circuit wiring that is electrically connected to a switching element forming the power conversion device, and through which a DC current or an AC current is transmitted thereto, a magnetic sensor that detects a magnetic flux change of a sensor magnet attached to a rotor of the AC motor, and a controller that calculates a current command value which is output from the power conversion device to the motor on the basis of position information of the rotor detected by the magnetic sensor, in which the controller includes a magnetic flux error correction unit that detects or calculates a magnetic flux component generated by a current flowing through the main circuit wiring.