PIC Microcontoller Input / Output Methods

For Perminant Magnet Motors

PIC based PM motor drive controller by Christopher Eddy of Pioneer Microsystems, Inc. Pittsburgh, Pa. (412)-369-9920

PIC based RC ECM by Johan Viktor

High Voltage PWM Prototyping tool: PWM Generator, Variable Freqency, Duty Cycle and Voltage, Potentiometer controlled, 2x16 LCD Display by Jinx

See:

• Speed / torque regulation
• Tachometer, RPM Sensors
• Easy Vision Systems : "Think about this: Would you rather pay for high precision bearings, drive trains, and encoders for each joint in an arm, or pay for two high precision servos for a tiny little eye that will track the end point of the arm?"

See also:

• http://www.botkin.org/dale/projects/speed Pushbutton PWM motor speed control with a 12CE674, 1 transistor or MOSFET or whatever, 1 resistor and a switch or two for UP/DN. Remembers last speed set and powers up at the same speed.
• Helge Buen refers to " http://www.piclist.com/techref/member/HB-operamail-885/index.htm For AC 3 phase motors: A simple 8 bit sine generator."
• http://www.ezy.net.au/~fastvid/encoder.htm (cached 20010413100503) Roman Blacks notes on using the back EMF spikes from the commutation in a DC motor for speed feedback.

Archive:

• PICList post "TRIPLE DC MOTOR CONTROL"

Questions:

• of rd asks:

  i want to have ra3(pin 1) on 16f84a alternate high and low at 30 second intervals to control motor direction through an lmd18200. can someone give me code for this? thanks

• celiktun at TakeThisOuTyahoo.com asks:

  Hi everyone: Am doing MS project on SRM. Using PIC16F877 as the controller. need to find out how I will accelerate and decelerate the machine. Cannot simply increase/decrease the switching freq. Need to implement a PI controller digitally. At the same time need to change between current chopping regulation (using chopping strategy) and single pulse operation as the machine speeds up. Say up to 1500rpm current chopping and above this single pulse operation.At very high speeds need to advance the switching angle. Hard stuff I have. Anyone knows anything e-mail to celiktun@yahoo.com pls... Cheers.

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