| 摘要 |
The servo amplifier is used for driving power transistors supplying current to a D.C. servo motor. The servo amplifier includes a control signal input; a tach signal input; circuitry coupled to the inputs for creating an error signal between the control signal and the tach signal; a triangular wave generator for generating a triangular wave form; a summing network for summing the error signal with the triangular wave; a modulator for modulating the resultanat signal; tri-state drive logic circuitry; and power transistor drive circuitry adapted to be coupled to the power transistors. The triangular wave modulator is coupled to the output of the summing network for supplying modulated signals to the tri-state drive logic circuitry and the drive logic circuitry having outputs coupled to the drive circuitry. The tri-state drive logic circuitry provides fast response to the error signals indicating a desired change in speed of the D.C. motor, and without over-shoot or hunting of the D.C. servo motor.
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