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Electric rotating machine and manufacturing process thereof
| Details |
Inventors: Maeda, Naohide; Asao, Yoshihito; Fujita, Masahiko;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Lam; Thanh
Assistant Examiner:
Attorney, Agent or Firm: Sughrue Mion, PLLC
In an electric rotating machine, a rotor can be manufactured relatively easily at reasonable cost without high working accuracy for pole cores, and a permanent magnet can be assembled without impairing cooling efficiency of the rotor. A magnet-holding member 7 is separately fixed to a claw-shaped magnetic pole 21 of at least one of a pair of pole cores 2, 3; each magnet-holding member 7 is provided with a magnet mounting part 72 on which a permanent magnet 5 is mounted on two sides of the claw-shaped magnetic pole 21 in circumferential direction; and each magnet mounting part 72 is formed so as to be located between the claw-shaped magnetic poles 21, 31 engaged with each other. |
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DETAILED DESCRIPTION To accomplish the foregoing objects, an electric rotating machine according to the present invention includes a rotor having a rotor core and a rotor coil magnetizing the rotor core, and in which the mentioned rotor core is arranged such that a number of claw-shaped magnetic poles covering the mentioned rotor coil are oppositely disposed so that a pair of pole cores formed at a predetermined pitch along circumferential direction are engaged with each other.
A magnet-holding member is separately fixed to each of the claw-shaped magnetic poles of at least one of the mentioned pair of pole cores.
Each magnet holding member is provided with a magnet mounting part on which a permanent magnet is mounted on two sides of the claw-shaped magnetic poles in circumferential direction, and each magnet mounting part is formed so as to be located between the claw-shaped magnetic poles engaged with each other.
In the above arrangement, the mentioned magnet-holding member is preferably fixed to each claw-shaped magnetic pole of both of the two pole cores.
Further, it is preferable that the mentioned magnet-holding member is fixed to the claw-shaped magnetic pole by at least one of welding, caulking or adhesion.
Furthermore, the mentioned magnet-holding member is preferably composed of spring steel.
A manufacturing method of an electric rotating machine according to the invention includes the steps of: fixing separately a magnet holding member, in which a magnet mounting part for mounting a permanent magnet is formed on two sides of each of claw-shaped magnetic poles in circumferential direction, to the mentioned each of the claw-shaped magnetic poles of at least one of a pair of pole cores formed at a predetermined pitch along circumferential direction covering a rotor coil; mounting a permanent magnet on the mentioned magnet mounting part; and engaging the pair of pole cores with each other so that the magnet mounting part, on which the permanent magnet is mounted, is located between the claw-shaped magnetic poles where the pair of pole cores are adjacent
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