| 摘要 |
PCT No. PCT/SE97/00929 Sec. 371 Date Nov. 30, 1998 Sec. 102(e) Date Nov. 30, 1998 PCT Filed May 29, 1997 PCT Pub. No. WO97/45943 PCT Pub. Date Dec. 4, 1997A self-starting brushless electric motor comprises a first motor part (stator) (11) and a second motor part (rotor) (16), each motor part having plurality of pole units (12U, 12V) arranged in a pole row. The motor parts are supported for relative movement with the pole rows confronting one another across an air gap. The poles of each row include first-type poles (13, 19) and/or second-type poles (14), each row having at least one pole type, either a reluctance pole or a permanent-magnet pole magnetized transversely across the air gap, which is included in all pole units of the row. At least one of the pole rows includes such a second-type pole. At least one pole unit of at least one of the pole rows includes a pole which is magnetically asymmetric to establish a preferential direction of rotation of the motor parts (11, 16). A polyphase winding system comprises first-phase and second-phase winding coils (15U, 15V) disposed around the pole units (12A, 12V) of the first motor part (11). The common-type poles (13, 14) of the pole units on the first motor part are spaced-apart such that whenever a common-type pole associated with a first-phase winding coil (15U) is in an attracted (magnetically aligned) position with respect to a common-type pole (19) on the second motor part (16) when the winding coil is energized, all common-type poles associated with a second-phase winding coil (15V) are in a non-attracted position with respect to all common-type poles of the second motor part. |
