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Permanent magnet field-type rotating machine
| Details |
Inventors: Mita, Masahiro; Sasaki, Takashi;
Assignee: Hitachi Metals, Ltd. (Tokyo, JP)
Primary Examiner: Laballe; Clayton E.
Assistant Examiner: Williams; Timothy A.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner
Disclosed is a permanent magnet field-type rotating machine of a high efficiency having an internal magnet-type rotor. The rotating machine comprises an internal magnet-type rotor having a plurality of permanent magnets embedded in a rotor yoke, and a stator disposed in opposed, spaced relationship to the rotor, with an air gap formed between the rotor and the stator. The rotor yoke comprises a member in which ferromagnetic regions and non-magnetic regions coexist, and the non-magnetic regions are disposed respectively at those positions of the rotor yoke where leakage magnetic flux is liable to be generated. |
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DETAILED DESCRIPTION With the above problems in view, it is an object of this invention to provide a permanent magnet field-type rotating machine of a high efficiency having an internal magnet-type rotor which is simple in construction, can be easily assembled, and has a high durability, and has such a magnetic circuit construction in which a leakage flux is very few.
According to a first aspect of the present invention, there is provided a permanent magnet field-type rotating machine comprising: an internal magnet-type rotor having a plurality of permanent magnets embedded in a rotor yoke; and a stator disposed in opposed, spaced relationship to the rotor, with an air gap formed between the rotor and the stator; wherein the rotor yoke comprises a member in which ferromagnetic regions and non-magnetic regions coexist, and the non-magnetic regions are arranged respectively at those positions of the rotor yoke where leakage magnetic flux is liable to be generated.
The followings are preferable variances of the above features.
The member, in which the ferromagnetic regions and the non-magnetic regions coexist, is formed of a single material comprising the ferromagnetic regions and the non-magnetic regions in which the both groups are different from each other in crystal structure.
The member, in which the ferromagnetic regions and the non-magnetic regions coexist, is of an integral construction.
The member, in which the ferromagnetic regions and the non-magnetic regions coexist, is composed of at least two components each of which has the ferromagnetic regions and the non-magnetic regions, the components being combined together to form the rotor yoke.
The permanent magnets are embedded in the components in each of which the ferromagnetic regions and the non-magnetic regions coexist.
The permanent magnets are disposed at boundaries between the components in each of which the ferromagnetic regions and the non-magnetic regions coexist.
The member comprising the ferromagnetic regions and the non-magnetic regions is composed of a first component which comprises the ferromagnetic regions and the non-magnetic regions, and a second component made of a ferromagnetic material, the both components being combined together to form the rotor yoke
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Generators or Motors 
