Motor generator developing low torque at high-speed revolutions without cogging

摘要

A motor generator is disclosed, comprising a cylindrical controller member(7) arranged between a permanent-magnet member(5) and a stator core(15). Circumferentially moving the cylindrical controller member(7) relatively of a stator core(15) contributes to achieving a low torque at high-speed revolutions with no occurrence of cogging. The cylindrical controller member (7) is supported in a frame(1) for relative rotation inside the stator core(15) and composed of permeable pieces(17) and non-permeable pieces(18), which alternate in arrangement circularly. The cylindrical controller member(7) is moved circumferentially by means of a stepping motor(8) according to the operational phase of the rotor(3). To get the rotor generator stopped, the permeable pieces(17) of the cylindrical controller member (7) are moved to an angular position where they face adjacent teeth(20) of the stator core(15) across slots(21) formed between the adjacent teeth(20), allowing the magnetic flux from the permanent-magnet member(5) to pass uniformly in the circumferential direction to thereby suppressing the occurrence of cogging.