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. 20, 2022
Filed:
Oct. 10, 2018
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Takafumi Hara, Tokyo, JP;
Toshiyuki Ajima, Tokyo, JP;
Shigehisa Aoyagi, Tokyo, JP;
Hiroyuki Ota, Hitachinaka, JP;
Kenichiro Matsubara, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
Disclosed are a motor control device that can accurately estimate a rotor position based on a neutral point potential even when a load increases, and a brake control device that is driven by the motor control device. The motor control deviceincludes a three-phase synchronous motorincluding a three-phase winding, an inverterconnected to the three-phase winding, a control unitfor controlling the inverter based on a rotor position of the three-phase synchronous motor, and a rotational position estimation unitfor estimating a rotor position θd based on a neutral point potential Vn of the three-phase winding. The rotational position estimation unit estimates a rotor position selectively using one or more of a plurality of detected values of the neutral point potential according to a pre-estimated value of the rotor position and a voltage application state to the three-phase winding.