| 摘要 |
PURPOSE: To obtain linearity and low-noise property in a large current by using a multiple power stage current source, wherein sufficient current distribution is performed, independently of circuit characteristics of an amplifier, in a current control loop controlling motor torque. CONSTITUTION: Individual linear current source amplifiers 12, 14, 16 for generating a desired wiring current are installed in stator windings 56A, 56B and 56C of a motor. A current command signal is inputted in an amplifier 24 via a terminal 18, and a feedback signal generated in a resistor 54 is inputted in an adding point 26 via an amplifier 58. The adding point 26 is connected with a bipolar current source switch 30 via an amplifier 28. A current source switch 30 is inserted between a positive voltage source +V and a negative voltage source -V, in series with a resistor 32 and a resistor 34, and generates a current which passes a resistor 32 or a resistor 34, according to the polarity of an error signal, and is proportional to a servo loop error. Respective current followers 36, 38, 40 and 42, 44, 46 supply currents, which are in proportional to the voltage drop applied to an output current bus 60. |
