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. 17, 2020
Filed:
Jan. 30, 2019
Applicant:
Okuma Corporation, Niwa-gun, Aichi, JP;
Inventor:
Satoshi Eguchi, Aichi, JP;
Assignee:
OKUMA CORPORATION, Niwa-Gun, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 1/00 (2006.01); H02P 1/28 (2006.01); H02P 3/00 (2006.01); H02P 7/06 (2006.01); H02P 21/22 (2016.01); H02P 27/08 (2006.01);
U.S. Cl.
CPC ...
H02P 21/22 (2016.02); H02P 27/08 (2013.01);
Abstract
A controller for a motor determines a voltage limit circle based on a velocity of the motor, a DC bus voltage of an inverter, calculates a q axis current limit value based on the voltage limit circle and a predetermined current limit circle, determines, as a q axis current command value, a value obtained through a limit process which is applied using the q axis current limit value to a q axis current value calculated in accordance with a torque command value, and determines a corresponding d axis current value based on the q axis current command value.