| 摘要 |
A motor control system utilizing a phase control power amplifier with controlled rectifiers which include circuit means to vary the magnitude of the actuating signals to said power amplifier as a function of the magnitude of a back EMF signal from the motor to compensate for gain variations occuring in the phase control power amplifier. In order to linearize the relationship between motor current and input control signal applied to the motor control system for all conditions of motor EMF, a voltage amplifier having a gain which varies nonlinearly with said input control signal is placed between the source of these input signals and the power amplifier itself. The gain of this voltage amplifier is appropriately varied by an associated circuit network. A positive feedback signal proportional to the motor back EMF value is combined with the output signal from the variable gain amplifier.
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