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Servo-Tek Distributor: DC Tachometer Generators. A Servo-Tek DC tachometer generator provides a convenient and economical means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control. Combining high accuracy with low driving torque, Servo-Tek tach generators are ideal for use in servo systems. Tach Generators are particularly suited to application in precision integrators and velocity servos, both of which require a highly linear speed/voltage relationships with minimum ripple.
Nov 22, 1999 | Electronic Design. Many dc servo motors provide an ac tachometer output for speed measurement or regulation. The circuit in Figure 1 uses such a tachometer output (output frequency proportional to motor speed) to create a speed controller with high-efficiency pulse-width-modulated (PWM) drive. The motor speed is precisely proportional to the input control voltage (VIN).