| 摘要 |
A radial gap brushless electric machine ( 30 ) having a stator ( 31 ) and a rotor ( 32 ) and a main air gap ( 34 ) also has at least one stationary excitation coil ( 35 a, 36 a) separated from the rotor ( 32 ) by a secondary air gap ( 35 e, 35 f , 36 e , 36 f) so as to induce a secondary flux in the rotor ( 32 ) which controls a resultant flux in the main air gap ( 34 ). Permanent magnetic (PM) material ( 38 ) is disposed in spaces between the rotor pole portions ( 39 ) to inhibit the second flux from leaking from the pole portions ( 39 ) prior to reaching the main air gap ( 34 ). By selecting the direction of current in the stationary excitation coil ( 35 a , 36 a) both flux enhancement and flux weakening are provided for the main air gap ( 34 ). Improvements of a laminated rotor, an end pole structure, and an arrangement of the PM elements for providing an arrangement of the flux paths from the auxiliary field coil assemblies are also disclosed.
|
