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. 03, 2012
Filed:
Oct. 28, 2008
Tiecai LI, Guangdong, CN;
Yamei Qi, Guangdong, CN;
Zhaoyong Zhou, Guangdong, CN;
Xiang Kong, Guangdong, CN;
Weilong Lan, Guangdong, CN;
Feipeng Xu, Guangdong, CN;
Tiecai Li, Guangdong, CN;
Yamei Qi, Guangdong, CN;
Zhaoyong Zhou, Guangdong, CN;
Xiang Kong, Guangdong, CN;
Weilong Lan, Guangdong, CN;
Feipeng Xu, Guangdong, CN;
Shenzhen Academy of Aerospace Technology, High-Tech Industrial Park, Shenzhen, Guangdong, CN;
Abstract
This invention relates to a three-phase square-wave permanent magnet brushless DC motor for solving problems of the existing square-wave permanent Magnet Motor and sine-wave permanent magnet motor. In this invention, the number 2P of magnetic poles on the said rotor core is 8; the slot number Z of the said stator core is 12, accordingly there are 12 teeth, including three big teeth, three medium teeth and six small teeth; the ratio of their mechanical angles is 50° (±5°) for big teeth: 40° (±5°) for medium teeth: 15° (±5°) for small teeth, and the sum of the mechanical angles of one big tooth, one medium tooth and two small teeth must be 120°. Three-phase concentrated windings are respectively wound on the big teeth and the medium teeth, in which there are only two concentrated windings for each phase, thus there are only 6 concentrated windings for the three-phase motor. With driven by three-phase square-wave current, the said motor can produce a smooth torque which ripple index corresponds to that of the sine-wave permanent magnet servo motor, at the same time, it also has a plurality of advantages including windings end minimization, air-gap minimization, material minimization, cogging torque minimization and loss minimization and so on.