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:
Jul. 10, 2007
Filed:
Jun. 14, 2004
Shigeki Nagase, Mie, JP;
Masahiko Sakamaki, Nara, JP;
Katsutoshi Nishizaki, Mie, JP;
Toshiaki Oya, Osaka, JP;
Takeshi Ueda, Nara, JP;
Shigeki Nagase, Mie, JP;
Masahiko Sakamaki, Nara, JP;
Katsutoshi Nishizaki, Mie, JP;
Toshiaki Oya, Osaka, JP;
Takeshi Ueda, Nara, JP;
Koyo Seiko Co., Ltd., Osaka-shi, Osaka, JP;
Abstract
In a current control system for a cylindrical permanent magnet synchronous motor as the drive source of an electric power steering apparatus, proportional gain Kdp and integral gain Kdi of a d-axis current PI control portionare respectively set to K1·Ld and K1·Rd on the basis of d-axis inductance Ld and d-axis resistance Rd of the motor. Further, proportional gain Kqp and integral gain Kqi of a q-axis current PI control portionare respectively set to K2·Lq and K2·Rq on the basis of q-axis inductance Lq and q-axis resistance Rq of the motor (K1 and K2 are optional coefficients). In this case, both of the d-axis resistance Rd and the q-axis resistance Rq have values resulting from adding the external resistance R' including wiring resistance to the internal resistance R of the motor.