| 摘要 |
PROBLEM TO BE SOLVED: To achieve cost reduction and downsizing by eliminating the use of a special actuator when allowing a rotor and a stator to relatively displace axially for change of characteristics of a rotating electrical machine. SOLUTION: To drive the rotating machine, a drive current for a few-pole rotor 8 and a drive current for a multipole rotor 11 are combined for supply to an armature coil row 14. At this time, a difference arises between the magnetic attraction of the few-pole rotor 8 and that of the multipole rotor 11, and a thrust force arises for energizing the rotor 1 right and left in the figure. While the drive current for the few-pole rotor 8 has a smaller amplitude than that of the drive current of the multipole rotor 11, the thrust force to the rotor 1 is small, and the rotor 1 is kept in a low-speed rotational position shown in the figure by an elastic means 16. By reducing the amplitude of the drive current for the multipole rotor 11 simultaneously while increasing the amplitude of the drive current for the few-pole rotor 8, the thrust force to the rotor 1 enlarges, and the rotor 1 is stroked, resisting the elastic means 16, and finally put in a high-speed rotational position. COPYRIGHT: (C)2010,JPO&INPIT
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