1
Download Servo - December 2012
Transcript
minimize any discrepancy between a desired and an actual position. In actuality, a simple DC motor servo loop would have been the ideal approach using a DC motor with position feedback. However, the unique servo loop in Figure 3 was implemented making use of a stepper motor in lieu of a DC motor, and vastly improved tracking performance using the same motor, was less complex, and cheaper. Figure 3. DC servo block diagram using a stepper motor. Electronic Circuitry for a DC Servo Using a Stepper Motor Figure 4 shows the electronic circuitry needed to implement the simple positioning servo using a stepper motor instead of a DC motor. Figure 5. Summing electronics. Figure 4. Circuitry required to implement the “DC Servo.” SERVO 12.2012 69
