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:
May. 16, 2017
Filed:
Apr. 16, 2012
Applicants:
Tadashi Kawaguchi, Hiratsuka, JP;
Kazuki Takehara, Hiratsuka, JP;
Jun Morinaga, Yokohama, JP;
Inventors:
Assignee:
Komatsu Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 17/32 (2006.01); H02P 7/06 (2006.01); E02F 9/12 (2006.01); E02F 9/20 (2006.01); H02P 3/02 (2006.01); E02F 9/22 (2006.01); H02P 23/20 (2016.01);
U.S. Cl.
CPC ...
H02P 7/06 (2013.01); E02F 9/123 (2013.01); E02F 9/2095 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); H02P 3/02 (2013.01); H02P 23/20 (2016.02);
Abstract
A control device of an electric motor includes: an operating state setting unit configured to set an operating state; a maximum output acquiring unit configured to acquire maximum output of the electric motor that is preset according to the operating state set; a speed detecting unit configured to detect a speed of the electric motor; a torque limit value calculating unit configured to calculate a torque limit value based on the speed and the maximum output; and a torque limiting unit configured to limit torque of the electric motor by the torque limit value when accelerating the electric motor.