Speed control of DC motor based on pi and hysteresis control

These are often used together in inner-outer loop control architecture, especially in high-performance motor drives.

Concept Overview

🔹 Outer Loop: PI Speed Controller

• Compares desired speed (setpoint) with actual motor speed.
• Outputs a reference current (torque-producing current).
• Provides smooth speed tracking.

🔹 Inner Loop: Hysteresis Current Controller

• Maintains actual motor current within a narrow band around the reference current.
• Provides fast dynamic current control, ideal for torque control.
• Controls chopper/converter switching.

Example Application Scenarios

• Electric vehicles (torque control + speed regulation)
• Servo systems
• Industrial DC drives requiring fast and accurate control

Implementation Options

• PI: Use in microcontroller, Simulink, or DSP code
• Hysteresis: Can be implemented using:
• Comparator + reference band (analog)
• Logic-based PWM controller (digital)