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. 15, 2000
Filed:
Mar. 10, 1998
Yasutomo Kawabata, Aichi-ken, JP;
Yoshiaki Taga, deceased, late of Aichi-ken, JP;
by Shigeo Taga, heir, Tokorozawa, JP;
by Takiko Taga, heir, Tokorozawa, JP;
by Tomoyo Taga, heiress, Nagoya, JP;
Masatoshi Uchida, Toyota, JP;
Akihiko Kanamori, Okazaki, JP;
Yukio Inaguma, Nagoya, JP;
Toshinobu Arakawa, Aichi-ken, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
A synchronous motor control system which can freely regulate n-phase electric currents in a synchronous motor to control the characteristics of the synchronous motor. The synchronous motor control system can enhance the output torque per unit weight of a synchronous motor (40) simultaneously with reducing torque ripples. The waveform of three phase alternating currents is freely corrected over a range of +30 degrees from a specified electrical angle, at which a target phase current drawing a sine-wave curve reaches its peak value. It is assumed that this range of .+-.30 degrees corresponds to a range of 0 degree to 60 degrees. By way of example, the waveform is controlled to the peak value of the phase current in a range of 0 degree to 28 degrees. The correction of the phase current is carried out for the target phase which produces the primary magnetic flux of a revolving magnetic field. This improves a fall in torque due to the phase shift and reduces torque ripples while keeping the mean torque at a high level. The system of the invention can arbitrarily regulate the torque waveform of the synchronous motor (40), thereby freely controlling the torque characteristics of the synchronous motor (40).