| 摘要 |
PURPOSE:To obtain a highly accurate electromotor control system by reducing position and speed ripples, by modulating a comparing level by angle of rotation at the time of the shaping of a resolver detection signal. CONSTITUTION:Signals Valpha, Vbeta having 90 deg. phase difference are supplied to a resolver 2 and a compensation circuit 5 from an exciting circuit 1 and the signal Valpha is further sent to a wave from shaping circuit 4. The angle-of-rotation signal detected by the resolver 2 is sent to a wave form shaping circuit 3 and the compensation circuit 5. In the circuit 5, each exciting signal is introduced into a phase shift adjusting part 8 to form predetermined voltage with respect to amplitude, frequency and a phase and said voltage is multiplied by the angle- of-rotation signal in an analogue multiplier 9 and voltage of a predetermined phase is obtained through LPF (filter) 10, a gain adjusting part 11 and an offset adjusting part 12 to be supplied to the comparator of the shaping circuit 3. A comparing level is modulated by the angle-of-rotation signal in the circuit 3 to perform the shaping of a wave form and an output signal Ptheta is converted to a speed signal through a F/V converter circuit 6 and sent to a position operation part 7. Then, by counting from the rising of the output signal of circuit 4 to the rising of the signal Ptheta, a position signal is obtained. |
