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:
Feb. 01, 2022
Filed:
Mar. 14, 2019
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Noriya Nakao, Tokyo, JP;
Kazuaki Tobari, Tokyo, JP;
Fumikazu Takahashi, Hitachinaka, JP;
Shingo Nishiguchi, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
Stable current control is performed even at the time of occurrence of disturbance, while the steadily occurring current pulsation is suppressed. A motor drive deviceincludes a power conversion circuitthat drives an alternating-current motorand a controllerthat controls the power conversion circuitThe controllerincludes a voltage command calculation unita control state judgement unitand a control gain change unitWhen the determination signal output from the control state judgement unitis switched from a determination signal representing a steady state to a determination signal representing a transient state, the control gain change unitimmediately changes the control gain to a value of normal setting, and when the judgement signal output from the control state judgement unitis switched from a determination signal representing the transient state to a judgement signal representing the steady state, the control gain change unitchanges, with a predetermined delay time, the control gain to a value of high-gain setting.