JPS55100093A - Detecting system for synchronous signal - Google Patents

Abstract

PURPOSE: To detect the phase of the secondary slide voltage of the induction motor by a method wherein the difference of the rotation angle of the induction motor and the rotation angle of the synchronous motor, which is composed of the revolving magnetic pole and the revolving armature coupled with the same revolving shaft of the induction motor and connected to the same power source, is detected.

CONSTITUTION: The revolving armature 41 of the synchronous motor 4 is coupled with the revolving shaft of the induction motor 2 and the revolving armature 41 is connected to the same power source of the induction motor 2 and further, the reduction ratio of the speed change gear 3 is set in proportion to the polarity number ratio of two motors 2 and 4. The phase detection disk 5 possessing the projection 51 is coupled with the revolving magnetic pole 42 of the synchronous motor 4 and the phase detectors 61∼66 are installed around the disk 5. The revolution of the rotor of the motor 2 makes the revolving armature 41 revolve by the same angle of an electrical angle and the difference between the rotation angle made by revolving magnetic field and the rotation angle of the motor 2 is transmitted to the revolving magnetic pole 42 to obtain from the detectors 61∼66, the detection signals corresponding to any optional phase of the slide voltage.

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