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. 07, 2010
Filed:
Apr. 24, 2008
Kentaro Oi, Hitachinaka, JP;
Kazuaki Tobari, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Mitsuo Sasaki, Hadano, JP;
Tatsuo Matsumura, Atsugi, JP;
Kentaro Oi, Hitachinaka, JP;
Kazuaki Tobari, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Mitsuo Sasaki, Hadano, JP;
Tatsuo Matsumura, Atsugi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A motor control apparatus which controls an output voltage reference for an inverter driving a permanent magnet synchronous motor based on d-axis and q-axis current references, d-axis and q-axis current detected values, and a computed frequency value. When a torque reference specifying torque greater than maximum torque that the motor can output is input, a limit value for a phase angle that is a deviation between a rotation phase reference of control and a rotation phase value of the motor is varied depending on a quantity of the predetermined state.