| 摘要 |
PURPOSE:To simplify the configuration of the controlling device and to obtain a control characteristic same as an ordinary DC motor by a method wherein the actual speed signal of a brushless motor, the deviation signal between the actual speed signal and the speed setting signal and the inversion signal thereof are supplied to electric power control elements as a voltage or current command. CONSTITUTION:A setting value V1 of a speed setting device VR1 and a speed detection value V2 by means of a tachogenerator TG are compared and amplified in a deviation amplifier A4 and a deviation DELTAV is output. And further, the DELTAV is supplied to an inversion amplifier A5 of a gain -1 and a deviation -DELTAV is output. The DELTAV and the -DELTAV are alternately entered in analog switches SW1-SW6. And the analog switches SW1-SW6 are made open and closed by means of the output r-t of a pole sensor PS and the NOT output thereof inverse r-inverse t. And further, DELTAV and -DELTAV are output alternately, thus, driving signals are given to power transistors Tr1-Tr6, through pre-amplifiers A1-A3, thus, each of phase terminal voltages r2-t2 are fed back by means of a voltage minor loop. |
