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:
Nov. 02, 2004
Filed:
Jul. 14, 2003
Yutaka Takahashi, Wako, JP;
Nobuyuki Imai, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Toyko, JP;
Abstract
An angle detector sets a q-axis command current to a first magnetic pole detecting current Iq_p and a second magnetic pole detecting current Iq p and performs a magnetic pole detecting process to calculate a first magnetic pole reference value A and a second magnetic pole reference value A (t -t , t -t ), and detect the orientation of the magnetic poles of a rotor of a motor based on the sign of the difference &Dgr;A (=A -A ) between the first magnetic pole reference value A and the second magnetic pole reference value A . The angle detector effects a proportional process only on the difference between the q-axis command current and a detected q-axis current and the difference between a d-axis command current and a detected d-axis current to calculate a current difference (t -t ) under current feedback control when the magnetic pole detecting process is carried out, and effects a proportional plus integral process on the above differences to calculate a current difference (t -t , t -) under current feedback control when the magnetic pole detecting process is not carried out.