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:
Oct. 18, 2011
Filed:
Oct. 15, 2007
Shigeki Nagase, Nabari, JP;
Takeshi Ueda, Kashiba, JP;
Akira Sugimoto, Ohtsuki, JP;
Kimihito Chino, Hokuto, JP;
Shigeki Nagase, Nabari, JP;
Takeshi Ueda, Kashiba, JP;
Akira Sugimoto, Ohtsuki, JP;
Kimihito Chino, Hokuto, JP;
JTEKT Corporation, Osaka-shi, JP;
Koyo Electronics Industries Co., Ltd., Kodaira-shi, JP;
Abstract
When stopping operation of an electric power steering apparatus, a motor relay is kept in an on-state even after a power supply relay is in an off-state. A drive control portion sets a target value of a d-axis current to a value other than zero and sets a target value of a q-axis current to zero, and performs a processing same as that at the time of rotating a motor. MOS-FETs contained in a motor driving circuit are controlled such that each of driving currents of the two phases or more is not zero and the brushless motor does not rotate even supplied with these driving currents. Electric charge accumulated in a capacitor is discharged via the MOS-FETs each in an on-state, a motor relay and the windings of the brushless motor. The electric charge accumulated in the capacitor may be discharged via the excitation coil of the motor relay.