| 摘要 |
PURPOSE:To improve magnetic balance so as to improve the generating characteristic of an electric motor by providing flowing easiness of magnetic flux different between the magnetic fluxes flowing in a rotor iron core and a magnetic pole piece. CONSTITUTION:A rotor iron core 1 consists of soft iron or high silicon steel such as a magnetic material of high relative magnetic permeability. A magnetic pole piece 3 is constituted of magnetic material of low relative magnetic permeability to consist of nickel or the like. Accordingly, in a magnetic pole where repulsive force is generated in the rotor core by same poles (S pole) of permanent magnets, a magnetic path is generated long but a magnetic material is provided with high relative permeability, so that magnetic flux density can be increased by allowing magnetic flux to easily flow. In a magnetic pole(N pole) generated in the magnetic pole piece, a magnetic path is generated short, but flux density can be decreased because of low relative magnetic permeability. Accordingly, magnetic balance between the rotor core and the magnetic pole piece can be attained. |
