Demonstration of PWM technique for motor speed control

Technical Analysis & Power Efficiency Demonstration

1. Oscilloscope View

— PWM Signal (Pulse) | --- Integration (V-Avg)

2. System Parameters

Duty Cycle (D) 50%
Switching Frequency (f) 500 Hz
Vavg = D × Vcc
Vavg = 0.50 × 12V = 6.00V

3. Thermal Insight (Power Loss)

Comparing MOSFET Heat (PWM) vs. Rheostat Heat (Linear) at current speed:

MOSFET
(PWM)

Efficiency: ~95%

vs
RHEOSTAT
(Linear)

Efficiency: 50%

4. Mechanical Response

Estimated Speed: 1500 RPM