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:
Apr. 11, 2017
Filed:
Feb. 21, 2013
Applicants:
Yoshiyuki Amemiya, Tokyo, JP;
Satoru Terashima, Tokyo, JP;
Inventors:
Yoshiyuki Amemiya, Tokyo, JP;
Satoru Terashima, Tokyo, JP;
Assignee:
Mitsubishi Electric Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 6/12 (2006.01); H02P 21/22 (2016.01); H02P 21/05 (2006.01); H02P 21/00 (2016.01); H02P 6/18 (2016.01); H02P 27/08 (2006.01);
U.S. Cl.
CPC ...
H02P 21/22 (2016.02); H02P 6/181 (2013.01); H02P 21/0021 (2013.01); H02P 21/05 (2013.01); H02P 27/085 (2013.01); H02P 2207/05 (2013.01);
Abstract
To achieve smooth switching of control without fluctuations in speed and torque, an excitation current command is allowed to transit linearly or in accordance with the function of speed between a value under sensorless vector control and a value under low-speed region control in accordance with a speed command or estimated speed in a speed region where the control is switched or in an adjacent speed region where sensorless vector control is performed. Therefore, abrupt variations in excitation current are reduced before and after the switching of the control.