Speed control of DC motor with resistor starter

Controlling the speed of a DC motor using a resistor starter is a traditional method used in series or shunt DC motors

How to Model It (Step-by-Step in Simulink)

1. Insert DC Motor Block

• Use:Simscape > Electrical > Specialized Power Systems > Machines > DC Machine
• Set it to Motor Mode
• Choose Shunt Wound or Series Wound

2. Connect Power Supply

• Add a DC Voltage Source
• Connect the source to the armature via a series resistor

3. Add Resistor Starter

• Use a Series RLC Branch block, set to resistor
• Simulate resistor starter by either:
• Keeping resistance constant
• Reducing resistance after startup using switch (simulates starter cut-out)

4. Apply Mechanical Load

• Connect Ideal Torque Source or mechanical rotational load
• Add Inertia and friction if needed

5. Measure Speed and Current

• Use:
• Speed Measurement block
• Current Measurement block

6. Control Resistor (Optional Enhancement)

• Use a controlled switch or logic to:
• Automatically bypass the resistor after motor reaches certain speed

7. Run Simulation

• Add Scope to view:
• Armature current
• Speed
• Torque