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:
Jan. 07, 2014
Filed:
Nov. 19, 2009
Kazuto Sakai, Kanagawa, JP;
Yutaka Hashiba, Kanagawa, JP;
Norio Takahashi, Yokohama, JP;
Kazuaki Yuuki, Saitama, JP;
Kazuto Sakai, Kanagawa, JP;
Yutaka Hashiba, Kanagawa, JP;
Norio Takahashi, Yokohama, JP;
Kazuaki Yuuki, Saitama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An increase of the magnetization current can be prevented during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotor () is configured by a rotor core (), a variable magnetic force magnet () and a fixed magnetic force magnet (). A variable magnetic force magnet () and a fixed magnetic force magnet () are overlapped in the magnetization direction thereof to form a series of magnets. The series of magnets is located within the rotor core at a position where the magnetization direction is in the direction of a d-axis. On either side of the series of magnets of the variable magnetic force magnet () and the fixed magnetic force magnet (), fixed magnetic force magnets () are located at a position where the magnetization direction is in the direction of the d-axis. When the flux linkage of the variable magnetic force magnet is reduced, a current of an armature coil allows a magnetic field to act in the reverse direction to the magnetization direction of the variable magnetic force magnet. When the flux linkage of the variable magnetic force magnet is increased, a current of the armature coil allows a magnetic field to act in the same direction as the magnetization direction of the variable magnetic force magnet.