| 摘要 |
PROBLEM TO BE SOLVED: To realize high speed, small size and low price by converting the output signal from a mover position detector into a three-phase constant amplitude sine wave signal thereby producing a high quality analog signal, i.e., a sine wave signal, and performing sine wave driving using the high quality sine wave signal. SOLUTION: A mover position detection means 2 detects the position of a mover and outputs three-phase sine wave signals CU, CV, CW having phase difference of 120 deg. electric angle corresponding to the position. The zero point voltage is controlled constant for the three-phase sine wave signals CU, CV, CM outputted from the mover position detection means 2 thus outputting three- phase constant amplitude sine wave signals RU, RV, RW from an amplitude regulation means 3. A multiplier means 5 then multiplies the three-phase constant amplitude sine wave signals RU, RV, RW by an external torque command signal to produce three-phase current control signals representative of the ratio of driving current or voltage for respective phases of a three-phase brushless motor 1. |
