AC motor control with PIC ???

Guest · Posted: Sun Jul 03, 2005 10:11 am

hey people i wanna use PIC16F877a to control speed of AC induction motor/pump (single-phase) with constant V/Hz method. i will use DC/AC PWM full bridge inverter so i'll need to write c code for pulse width modulation which will send appropriate signal to mosfets which will further produce AC neccessery to run the motor. the speed will be adjustible by using variable resistor.
so i would honestly appreciate if someone could help me with c code or some helpfull pwm examples related to thing mentioned above

thanks in advance

valemike · Guest

I'm just a software person, but i've never heard of a full-bridge inverter to drive an AC motor. I always thought those the configuration was to drive a DC motor.

Guest · Posted: Mon Jul 04, 2005 2:25 am

yes you can use it to drive an AC motor. but can you help with the C or Asm code??? those webpages can be usefull to understand the principle:

http://www.ece.osu.edu/ems/MotorDrive/spra284a.pdf
http://www.ab.com/drives/techpapers/PWMDrives01.pdf

libor · Joined: 14 Dec 2004 Posts: 288 Location: Hungary

There are lots of application notes on the Microchip website, including general motor control, AC induction motor control, etc. look here
Most are for 3-phase motor, but you can easily adapt the ideas simplifying it to 1-phase.
Or look for the Motor Control Design Center on their website.

Or look here for a huge collection of links for motor control (including PIC applications) ePanorama

Bee sure to consider the motor control family of PIC microcontrollers for your application, these have several channels of full bridge driving delay timed 14-bit resolution PWM outputs in hardware: those PICs that end with a 1 in their names, like the 18F2431, etc.