Hey guys, I am beginig to make a three phase motor controller for my RC car with a dsPIC30F5015 microcontroller and I have a few questions, Im quite new at programming. Also, I need at least 256 Bytes of EEPROM, and I was wondering if there was any other PIC more suited for my application.
1. I looked at the datasheet for it and I found a mode called
"Complementary PWM Operation"; found here on page 100: http://ww1.microchip.com/downloads/en/DeviceDoc/70149D.pdf
, what does this mean? My interpritation was that it creates PWM
signals on the PWM pins that can power my three phase motor.
2. Is there a common method for approaching three phase generation on the PIC?

Thanks a Ton!!!!

 

Are you sure you have a three phase motor? Most RC car motors are permanent magnet DC types that are well suited to PWM speed control.

 

Yeah im sure. I forgot to mention that it is a sensorless motor. Most high speed after market rc cars have sensorless brushless 3 phase motors.

 

The PIC is really for DSP, so not really suited to the usage.

What specific motor are you using.

 

You can find it here; http://www.castlecreations.com/products/neumotors/1500/1515/1515-1y.html

 

Guess I'll have to take your word for it - the site gives zilch worth of useful information about the motors.

I was always under the impression that brushless DC motors had the DC to AC 3 phase circuitry built in. I would want to verify how those motors are made and controlled.

If you want to do your own motor controlling, look for a PIC (not a DSP) with at least 3 channels of PWM built in.

 

Thanks!!!!!!!!!!!!

 

I've never had any dealings with brushless motors so can't offer any advice, but the Microchip site has plenty of info on the subject including application notes and sample code.

Take a look at http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2125&param=en026745

 

Guess I'll have to take your word for it - the site gives zilch worth of useful information about the motors.

I was always under the impression that brushless DC motors had the DC to AC 3 phase circuitry built in. I would want to verify how those motors are made and controlled.

If you want to do your own motor controlling, look for a PIC (not a DSP) with at least 3 channels of PWM built in.

No the typical brushless sensorless R/C motor is just three windings in delta configuration and using permanent magnets for the rotating field. It is really an AC motor and the speed controller does the conversion of battery DC voltage to 3 phase drive to the motor windings. The many commercial R/C brushless motor speed controllers are very competively priced and it would be hard to duplicate their function at less total costs. You drive the controller just as if it were a R/C servo with PPM pulse control.

Lefty