| 摘要 |
PURPOSE:To obtain a pulsating voltage free from a fundamental wave by a method wherein a compensating linear ring is wound around the root of a stator tooth located in the position of the fixed electric angle facing to a revolution detection coil wound around the rotor side end of a stator tooth and from both terminals of said coil the output pulsating voltage is obtained. CONSTITUTION:A rotor 6 is rotatably held by a stator 1, while on the stator 1 a stator tooth 2 and a coil groove 4 are formed and through the coil groove 4 the stator tooth 2 is wound around by a main exciting coil 3. The rotor side end of the stator tooth 2 is wound around by a revolution detecting coil 9 and facing the linear ring 9 the root of stator tooth 2 located in the position of an electric angle npi is wound around by a compensating coil 10, then these are connected in the manner that the signal (a) generating from the coil 9 cancels the fundamental wave signal (b) generating from the coil 10. Thereby at both terminals of both coils the pulsating frequency (c) through the rotor tooth 8 free from the fundamental wave can be obtained. |
