| 摘要 |
PURPOSE:To reduce a noise efficiently by setting a saturated voltage responsive to a torque command value, comparing it with an operating voltage, and correcting the current amount of a transistor drive control signal. CONSTITUTION:A driver for a brushless motor connects a P-N-P TrQ49 instead of a constant-current source to the common emitter side of transistors(Tr) Q13, Q15, Q17, and connects a N-P-N TrQ50 to the common emitter side of Trs Q14, Q16, Q18. A constant-current source 17 to be controlled by a current amount is provided by a control amplifier A1, and a current distributor having Trs Q39-Q48 is provided between the TrQ49 and Q59. It further has an error amplifier A2, a reference voltage power source 18, and an amplifier 19, and a saturated voltage setter 22 with constant-current sources 20-21, etc., a constant- current source 24 of drive TrQ21, etc., and a current correcting circuit 25 with Tr Q35-Q38. Thus, a saturated voltage responsive to the torque command value is set, and a motor is driven. |
