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:
Oct. 26, 2010
Filed:
Mar. 25, 2008
Shinji Ishii, Yokohama, JP;
Shinji Ishii, Yokohama, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
Size and weight reduction of a motor-driven vehicle, robot or the like is achieved. A current command Iref from a speed feedback gain is supplied to each of circuits with coefficients of sin(θm), sin(θm+2π/3) and sin(θm−2π/3) to generate three-phase signals. The three-phase signals are respectively supplied to current control gains through adder-subtracters. Further, signals from motor constants are added together by an adder to produce motor torque. Furthermore, coil voltages output from adders pass through diodes and are then added together by an adder, and the signal is supplied to a regenerative voltage determiner. When a regenerative voltage becomes excessive, in-phase current Idc is supplied through a regeneration control gain to adder-subtracters.