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:
Mar. 29, 2022
Filed:
Jan. 17, 2019
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Shigehisa Aoyagi, Tokyo, JP;
Takafumi Hara, Tokyo, JP;
Yoshitaka Sugiyama, Hitachinaka, JP;
Masaki Kashima, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
An applied voltage decision unitperforms in parallel, a process of determining three-phase AC commands V* to V* of a voltage applied to a motor by an inverter based on a position, of a rotor of a motor, detected by a position sensor with an output A, and a process of determining three-phase AC commands V* to V* of the voltage applied to the motor by the inverter based on a neutral point voltage VN of the motor. A PWM modulatoralternately outputs a PWM signal according to the three-phase AC commands V* to V* and a PWM signal according to the three-phase AC commands V* to V* to the inverter. A control device determines whether or not the position sensor with the output A has failed by comparing the position, of the rotor, detected by the position sensor with the output A with a position, of the rotor, estimated from a neutral point voltage VN of the motor.