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. 25, 2007
Filed:
Jul. 05, 2005
Shoji Sasaki, Chiyoda-ku, JP;
Ryoichi Kobayashi, Chiyoda-ku, JP;
Norio Moriyama, Chiyoda-ku, JP;
Hiroshi Ichige, Chiyoda-ku, JP;
Shoji Sasaki, Chiyoda-ku, JP;
Ryoichi Kobayashi, Chiyoda-ku, JP;
Norio Moriyama, Chiyoda-ku, JP;
Hiroshi Ichige, Chiyoda-ku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electric power steering drive system provided with a motor with its torque pulsation reduced, and a controller characterized by excellent manufacturability. The stator core of a motor is composed of an annular back core and a plurality of teeth created separately from the back core and secured on the inner periphery of the back core. An 8-pole/9-slot, 10-pole/9-slot or 10-pole/12-slot relationship is found between the number of the magnets of a rotor (number of poles) and the number of slots. The diameter of the stator coil is 1.0 mm or more. A motor controller comprises a power module, a conductor module and a control module. The terminal of the power module and the bus bar of the conductor module are connected by welding, whereas the terminal of the power module and terminal of the control module are connected by soldering.