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:
Dec. 06, 2011
Filed:
Jul. 11, 2005
Satoru Kaneko, Naka, JP;
Kenta Katsuhama, Hitachinaka, JP;
Shigeru Akaishi, Isesaki, JP;
Kazuya Motegi, Ohta, JP;
Tatsuyuki Yamamoto, Hitachinaka, JP;
Satoru Kaneko, Naka, JP;
Kenta Katsuhama, Hitachinaka, JP;
Shigeru Akaishi, Isesaki, JP;
Kazuya Motegi, Ohta, JP;
Tatsuyuki Yamamoto, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A controller of a field winding type synchronous motor is provided that can stably output torque even if the d-axis current pulsates by reducing torque pulsation without causing fluctuation in the magnetic flux acting on the torque. A motor control unitperforms control so that a desired torque can be generated from a field winding type motorhaving a field windingon the rotor. Based on a current Id flowing in the d-axis direction out of the current flowing in a stator windingof the field winding type motor, the motor control unitcalculates an induced voltage Vfbeing induced in the field windingand compensates a field voltage Vf of the field winding based on the induced voltage Vf, thus suppressing pulsation of the field current flowing in the field winding of the field winding type motor