Re: Hey, Wingerr , got PWM ?? - Saab 9000 Bulletin Board - Saabnet.com
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Re: Hey, Wingerr , got PWM ??
Posted by udderslate (more from udderslate) on Mon, 10 Sep 2007 14:26:44
In Reply to: Re: Hey, Wingerr , got PWM ??, Wingerr, Mon, 10 Sep 2007 07:20:47
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Excellent point about the transition time of the lm324 and FET heating .
In the car , the motor is high side , the respack is between it and gnd.
The dash switch moves GND across the series res stack .
The respack is 3 series resistors , 1.9, 0.8, 0.35 .
Position 1 is 3.05 ohms
Position 2 is 1.25 ohms
Position 3 is 0.35 ohms .
Position 4 is direct to the motor .
Assuming blower at full speed is full battery voltage ( or close enough )
the remaining resistance is 13.2v/18a = 0.73 ohms . motor resistance,
wiring,switch losses...
too bad the motor changes its load as RPM changes , otherwise the restwould simple .
gotta go dinner time .
Nice chatting .
posted by 137.71.2...
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