Three-phase PWM

[toudenter]

Hello,

How to use CAL_PWM or PWM(Internal) to generate three-phase PWM signals using dsPIC30F for inverters ?

Thank you

[BenR]

Hello,

A simple way is to use a brushless ESC and the servo motor controller component.

A more advanced way giving more control would be to have a look up table containing duties for a sine wave output. Values below 0 would be set to 0. You would then have three pointers to the lookup table each 120 degrees out of phase which assign PWM duties to each of your PWM outputs. You would advance the pointers on a regular time interval and speed up or slow down the motor by altering the interval.

[toudenter]

Thanks for reply.
My application is a three-phase PWM inverter. To generate generate 5 kHz PWM signals with programmable deadtimes for each H bridge leg, I am used to configure PWM registers in other compliers but it is quite complicated. So I try Flowcode which is easy to use and students like it. If Flowcode can provide a component macro to do that task it would be great.

[BenR]

Hello,

Flowcode currently has a hbridge component if you do a component search, however it currently only supports the 8-bit PIC devices. Which dsPIC30F device are you looking at and I may be able to add support for this quite easily.

[artan]

Can someone find me some brushless engine project in the flowcode?

[artan]

Hello, I'd be honored if you find me a brushless engine control project, I'm looking everywhere but I don't see an example like that, thankyou ...

[chipfryer27]

Hi

FC doesn't have a component so you will need to create your own control program.

This link may help

http://ww1.microchip.com/downloads/en/A ... 00857B.pdf

Regards

[artan]

thank you. And once again if you can help me, I need to convert this part of the code into the flow code and I have no idea how to do the option for conversion say a syntax error, can you write me correctly or submit me to the flow code

[chipfryer27]

Hi

In Ben's post above he recommends using a brushless ESC and the PWM component. Many examples in wiki of using the PWM.

Regards