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Reluctance motor having magnetic poles formed by laminating steel plates in circumferential direction
| Details |
Inventors: Kawabata, Yasutomo; Miura, Tetsuya; Hirako, Masaru;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Nguyen; Tran N
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Directional electromagnetic steel plates are laminated, and a plurality of stator and rotor core segments are produced by generating into an approximate U-shape so as to provide a U-shaped cross section of the lamination. The direction of high magnetic permeability of the directional electromagnetic steel plates is aligned during lamination with the direction along said U-shape. The side portions of the U-shape adjoin each other and are arranged along the circumference to produce the stator and rotor cores. As the electromagnetic steel plates are laminated, fluctuation in the components in the circumferential direction of the magnetic flux within the magnetic poles and salient poles can be reduced, and iron loss can thus be lowered. In addition, the direction of high magnetic permeability of the directional electromagnetic steel plates coincides with the direction of the magnetic flux creating a much stronger magnetic flux. |
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DETAILED DESCRIPTION The present invention has been made to solve the problem as stated above and its object is to reduce the iron loss and provide a reluctance motor having compactness, a high efficiency and a high output.
To achieve the objects as stated above, the reluctance motor related to the present invention has a fixed portion core formed by a magnetic material, has a fixed portion for generating a shifting magnetic field and a moving portion core formed by a magnetic material; at a portion opposite to said fixed portion, part of the moving portion core is arranged along the moving direction of the shifting magnetic field at predetermined intervals, and has a moving portion moving as a result of the interaction with the shifting magnetic field.
Moreover, at least one of the fixed portion core and the moving portion core has a pole laminated along the moving direction of the shifting magnetic field with grain oriented electromagnetic steel plates having magnetic permeability varying depending upon the direction, and the direction of the high magnetic permeability of the grain oriented electromagnetic steel plate within the pole coincides with the direction in which the fixed portion core is opposite to said moving portion core.
Since the magnetic flux cannot be generated easily in a direction through an electronic magnetic steel plate, a change in the moving direction component of a magnetic field of the magnetic flux in the pole can be reduced.
By doing this, the occurrence of iron loss created by a change in magnetic flux can be restricted and accordingly the efficiency and output of a motor can be enhanced.
Also, since the direction of high magnetic permeability of the grain oriented electromagnetic steel plate coincides with the direction in which the fixed portion core is opposite to the moving portion core, the direction of the high magnetic permeability almost coincides with the direction of the magnetic flux generated.
By doing this, the magnetic resistance of a polar portion becomes smaller, and the difference in magnetic permeability between the polar portion and other portions becomes larger
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