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:
Feb. 06, 2001
Filed:
Sep. 30, 1999
Yoshihito Kato, Fuchu, JP;
Tadamitsu Yoshikawa, Ome, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
According to this invention, there is provided a motor control apparatus comprising a field weakening device for converting a velocity feedback signal obtained from the rotational speed of a motor into a secondary magnetic flux reference signal by using a field pattern, a field pattern selector for comparing a predetermined signal with a q-axis torque current reference signal obtained on the basis of the secondary magnetic flux reference signal converted by the field weakening device, the velocity feedback signal, a velocity reference signal, and a torque reference signal, and outputting, on the basis of the comparison result, a control signal for switching the field pattern, and a field pattern storage section for switching, on the basis of the control signal output from said field pattern selector, the field pattern to be used in the field weakening device. Since the selector can switch the field pattern, an accurate torque output can be realized.