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| Cover for electric motor |
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| Motor having rotatable shaft coupled with worm shaft |
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| Rotary actuating drive and rotary switch |
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Multi-phase permanent-magnet type electric rotating machine
| Details |
Inventors: Sakamoto, Masafumi;
Assignee: Japan Servo Co., Ltd (Tokyo-to, JP)
Primary Examiner: LaBalle; Clayton
Assistant Examiner: Enad; Elvin G.
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
A multi-phase permanent-magnet type electric rotating machine comprising: a permanent magnet type rotor, the permanent magnet type rotor including pairs of magnetic bodies magnetized by an axially magnetized cylindrical permanent magnet and disposed so as to face each other in a manner so that different poles of the magnetic bodies are disposed alternately or including a cylindrical permanent magnet having a multi-polar-magnetized outer circumferential surface; and a stator disposed so as to face the rotor through an air gap therebetween, the stator having 6N or 10N (N being an integer not smaller than 1) main poles formed in a distributed fashion, the stator having coils wound on 3N or 5N in total of the 6N or 10N main poles selected every other one, wherein the coils wound on the 3N or 5N main poles are connected so as to form a star connection and at least one of the three or five terminals of the star connection of the coils is connected to a predetermined polarity of a power supply while all or part of the other terminals of the star connection are connected to the same opposite polarity of the power supply, whereby the polarity of one of the three or five terminals of the star connection is reversed sequentially by driving so that the rotor is made to rotate step by step. |
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DETAILED DESCRIPTION In order to solve the foregoing problems, according to the first aspect of the present invention, provided is a multi-phase permanent-magnet type electric rotating machine comprising: a hybrid rotor including an axially magnetized annular permanent magnet, and a pair of magnetic bodies each of which has a predetermined number of pole teeth formed at equal pitches on its outer circumferential edge, the pair of magnetic bodies being fixedly disposed in a manner so that the pole teeth of one of the magnetic bodies and the pole teeth of the other of the magnetic bodies are made opposite to each other while the former and the latter are circumferentially biased by 1/2 pitch relative to each other with the annular magnet put between the pair of magnetic bodies; and a stator disposed so as to face the rotor through an air gap therebetween, the stator having 6N (N being an integer not smaller than 1) main poles formed in a distributed fashion; wherein a three-phase permanent-magnet type electric rotating machine is arranged so that the stator has coils wound on 3N in total of the 6N main poles selected every other one.
According to the second aspect of the present invention, provided is a multi-phase permanent-magnet type electric rotating machine comprising: a permanent-magnet type rotor including a pair of comb-teeth-like magnetic bodies magnetized by an axially magnetized cylindrical permanent magnet and disposed so as to face each other in a manner so that different poles of the magnetic bodies are disposed alternately, or including a cylindrical permanent magnet having a multi-polar-magnetized outer circumferential surface; and a stator disposed so as to face the rotor through an air gap therebetween, the stator having 6N (N being an integer not smaller than 1) main poles formed in a distributed fashion; wherein a three-phase permanent-magnet type electric rotating machine is arranged so that the stator has coils wound on 3N in total of the 6N main poles selected every other one
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