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From: Meral on 21 May 2010 10:47
Hello everyone

I am implementing a three phase inverter. I have eZdsp f2812 kit. I use Simulink Target Support Package TC2 for software. But I don't understand the PWM block exactly. "Simulation of FOC Using PMSM Model" and "Permanent Magnet Synchronous Motor Field-Oriented Control" demos in PWM bock;
Waveform Period: (2^12)+1
Waveform Period Unit:clock cycle

What does this mean? What is the frequency of PWM generated?

Regards....
From: Philip Chu on 21 May 2010 11:43
When PWM Waveform Period Unit is set to "clock cycle ", the period is
calculated using the high speed peripheral clock, which is usually CPU
clock / 2, and for F2812, it is 150Mhz /2 = 75Mhz.

So when the Waveform Period is (2^12)+1 = 4097, the PWM period is 4097 * 1/
75000000 = 66.27 ms, and PWM waveform frequency is 18.3Khz.

Hope this helps.

Philip


"Meral " <meralozarslan(a)yahoo.com> wrote in message
news:ht66d7$bat$1(a)fred.mathworks.com...
> Hello everyone
>
> I am implementing a three phase inverter. I have eZdsp f2812 kit. I use
> Simulink Target Support Package TC2 for software. But I don't understand
> the PWM block exactly. "Simulation of FOC Using PMSM Model" and "Permanent
> Magnet Synchronous Motor Field-Oriented Control" demos in PWM bock;
> Waveform Period: (2^12)+1 Waveform Period Unit:clock cycle
> What does this mean? What is the frequency of PWM generated?
> Regards....


From: Meral on 24 May 2010 03:20
Thank you very much Philip

It is very useful for me. Thanks...
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