stepper motor sequencer

1. ICE 3015: CONTROL SYSTEM
COMPONENTS
Class 14: Stepper Motor Drivers
Dr. S. Meenatchisundaram
Email: meenasundar@gmail.com
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018

2. Driver circuit:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018
• To provide necessary voltage for energisation of stator winding
• To maintain proper sequence of energisation.
• The supply to the stator winding is neither dc nor conventional ac.
• It is in the form of train of pulses generated by some form of pulse
generator.
• Before controlling the stepper motor the programmer should know
the number of steps required per unit time or per revolution.
• It will decide the step size required.
• It also depends on motor construction type and specifications.
• At the same time the direction of motion should be specified.

3. Block diagram:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018

4. Sequencer:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018

5. Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018

6. Sequencer:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018
• Q1-Q2 → A1, A2 → A1 – N, A2 – S
• Q3-Q4 → A2, A1 → A1 – S, A2 – N
• Q5-Q6 → B1, B2 → B1 – N, B2 – S
• Q7-Q8 → B2, B1 → B1 – S, B2 – N

7. Logic Sequencer:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018
Step 1 Step 2 Step 3 Step 4
Q1 – Q2 ON
Q3 – Q4
Q5 – Q6
Q7 – Q8 ON
ON
ON ON
ON

8. Step Angle Calculation:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018

9. Driving Circuit:
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018

10. References:
• nptel.ac.in/courses/108105063/pdf/L-
32(SS)(IAC)%20((EE)NPTEL).pdf
Control System Components (ICE 3015)
Dr. S.Meenatchisundaram, MIT, Manipal, Aug – Nov 2018