1. Jianming Yao ECE734 Project Fall 2000
Single Phase Induction Motor Adjustable Speed Control Using DSP and Micro-Controller
Jianming Yao
ECE734 Project Fall 2000

2. Requirements for Single Phase Induction Motor Drives
Voltage ratio Vaux/Vmain is approximately equal to the effective turns ratio , Naux/Nmain
Current ratio is Iaux/Imain=1/
Vaux leads Vmain by 90º at rated frequency
Constant V/Hz for adjustable speed drive

3. Topology and Control Signals

4. Pulse Width Modulation (PWM)
PWM is used to generate sinusoidal power output

5. PWM & Dead Time Generation

6. DSP Approach

7. Programming with TMS320F240

8. Micro-Controller Approach
Testing points
PWM for a & b
PIC17C756
PWM for c
Speed control

9. Programming with PIC17C756

10. Hardware implementation
AC~ 2 3 12
Control signals or
Microcontroller
DSP

11. Experimental Results Motor currents PWM signals for IGBT
1A/div, 5ms/div
PWM signals for IGBT
10V/div, 0.1ms/div