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Sinusoidal PWM Control for PMSM Motor

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Marimuthu

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Hi friends,
I am working in electric vechicle controller segment. Already, I have done my bldc controller using six step ( trapezoidal ) control method. I was completed my project using STM32f103c8t6 controller.

I need to control the PMSM motor using sinusoidal PWM control method.

My requirement is,

1. How to generate sinusoidal PWM.
2. What is the commution state for sinusoidal PWM control .
3. How to apply sinusoidal pwm logic in PMSM motor controlling program.
 

Hi,

1. How to generate sinusoidal PWM using program ?
Click to expand...
There are many threads here in the forum, more in the web.
Even tutorials.

Klaus
 

Marimuthu said:
1. How to generate sinusoidal PWM.
Click to expand...

At each point on the sine cycle, the length of a pulse is based on the sine at that mark.

Say at 90 degrees your pulse length is max.
Then at 1 degree your pulse length is max times sine(1), that is, max times .017.
At 2 degrees the length is max times sine(2), or max times .035.
Etc.
 

see my post "Sine PWM calculating instead of table" or something like that, I don't know exactly if this works but it seem it does. I'm waiting a guru answer. You would have to add a factor in the program to control the width. I tryed to do the control signal analogical (comparing a triangle signal with a sine one) and I did the circuit, but there were too much elements and factors that I could'n control, so the signal was not what I expected.
 
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