 # Lab Experiment for Transfer Function of Ac Servo Motor

## Aim

To determine the motor constant K2.

## Equipments Required

Two phase A.C servo motor with Load setup.

☞PS-CS-TAS modules.

☞Patch chords.

## Experimental Procedure

1. Initially keep potentiometer is minimum position.

2. Connect banana connectors “ P1” to “C1” and “P2” to C2

3. Connect 9 pin D-connector from motor feed back into input of, the module.

4. Switch ON the 230V AC supply to the motor setup.

5. Switch ON the power ON/OFF switch.

6. Switch ON the S2 (main winding) and S1 (control winding).

7. Vary the control voltage by using potentiometer and set the rated voltage (230V) to control phase winding.

8. Apply the load on the motor step by step up to motor will run at 0 rpm. For each step note the readings (Load and Speed) as shown in the table 1. Speed is measured from LCD display.

9. To calculate the torque value.

10. Plot the graph Speed Vs Torque.

11. The slope of speed – torque curve given the motor constant K2.

## Formula to be Used

Torque (T) = 9.81 × r × s NM.

S = Applied Load in Kg. r = Radius of shaft in m. = 0.068 meter

## Result

Thus the motor constant K2 was obtained.

## AIM

To determine the motor constant K1.

## Equipments Required

Two phase A.C servo motor with Load setup.

☞PS-CS-TAS modules.

☞Patch chords.

## EXPERIMENTAL PROCEDURE

1. Initially keep potentiometer is minimum position of this module.

2. Connect banana connectors “ P1” to “C1” and “P2” to C2

3. Connect 9 pin D-connector from motor feed back into input of the module.

4. Switch ON the 230V AC supply to the motor setup.

5. Switch ON the power ON/OFF switch.

6. Switch ON the S2 (main winding) and S1 (control windings).

7. Vary the control voltage by using potentiometer and set the rated voltage (230V) to control phase winding.

8. Apply the load on the motor step by step up to motor will run at 0 rpm

9. For each step note the load and control winding voltage is shown in the table 2.

10. To calculate the torque value.

11. Plot the graph Torque Vs Control voltage.

12. The slope of torque – control voltage curve gives the motor constant K1.

## Formula to be Used

Torque (T) = 9.81 × r × s Nm

S = Applied Load in Kg. r = Radius of shaft in m. 0.068 m