| 摘要 |
PURPOSE:To simplify a composition and enable a device to be positioned at high precision, by multiplying position signal from a non-contact sensor contained in a motor, by position signal selected with an electronic switch means, to change the amplitude of phase exciting position signal, and by energizing coils. CONSTITUTION:The position of a rotor 7 is detected by a noncontact sensor 5, and the input of three-phase position signal output from the non-contact sensor 5, to an FV converter 15 and a first and a second phase advancers 16, 18 via amplifiers 8a-8c is provided. The first phase advancer 16 is controlled by the output of the FV converter 15, and the input of the output to a multiplier 9 is provided, and is multiplied by position signal from an electronic switch circuit 12. The output of the multiplier 9 is fed to a three-phase sine type driving circuit 10, and current to the coils 4a-4c is controlled. |
