Error in SPWM Motor PWM Output

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kanchibhotla14
Posts: 3
Joined: Tue Mar 27, 2012 7:34 pm

Error in SPWM Motor PWM Output

Postby kanchibhotla14 » Mon Apr 09, 2012 6:40 pm

Hello Sir,
I want to generate the SPWM and simple PWM to GPIOs ... SPWM of fundamental frequency 50Hz and Switching frequency 5kHz .....but when we build and run the program i am getting the switching frequency is of around 63Hz and fundamental frequency 2Hz ....simple PWM is of least frequency...
Ts = 2e-6 and Fixed step size is of 2e-6 (in solver) and MIPS 20e6 (in master).....even the fixed step size (in solver) is every time is resetting to 0.01..... I am attaching the simulation file...can you check and please tell me how to get the my required pwm frequency and spwm....even i tried with rate transition box but no use...
Attachments
PWM.mdl
SPWM Motor PWM Output
(30.23 KiB) Downloaded 182 times

LubinKerhuel
Site Admin - Expert
Posts: 616
Joined: Wed Mar 07, 2007 11:23 pm
Location: Marseille - France
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Re: Error in SPWM Motor PWM Output

Postby LubinKerhuel » Fri Apr 27, 2012 1:13 am

Hello,

You will not generate a PWM efficiently using digital output blocks.
Use the PWM like block, or Output Compare block.

You might find some examples on the website or within blockset example folder.

Lubin

pakerjon
Posts: 1
Joined: Thu Feb 21, 2013 6:44 am

Re: Error in SPWM Motor PWM Output

Postby pakerjon » Thu Feb 21, 2013 6:59 am

Thanks LubinKerhuel for giving the correction & new idea...

:) 8)

Casper
Posts: 2
Joined: Thu Oct 03, 2013 8:16 am

Re: Error in SPWM Motor PWM Output

Postby Casper » Mon Dec 09, 2013 12:25 pm

Thanks for making me understand about the exact issue. I was not aware about not to generate a PWM efficiently using digital output blocks. I usually use the PWM for the output blocks. Now on wards I will make use of the Output Compare block.





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