US Patent 7638920 Brushless motor and electric power steering system

Patent 7638920 was granted and assigned to JTEKT on December, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

JTEKT

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

76389200

Patent Inventor Names

Noboru Niguchi0

Naotake Kanda0

Date of Patent

December 29, 2009

Patent Application Number

117538180

Date Filed

May 25, 2007

Patent Primary Examiner

‌

Quyen Leung

Patent abstract

A brushless motor including a rotor which has ten permanent magnets each containing rare earth neodymium and provided around a rotor yoke and an outside diameter of 45 mm to 55 mm, and a stator which has a stator core having twelve slots and an outside diameter of 75 mm to 85 mm and whose magnetomotive force at maximum current is 700 AT or more. The stator core is configured such that a teeth width b is 0.14 times or more of the outside diameter of the rotor.