[DeTomaso] NPC: Electric validation
Dave Londry
davel at emspace.com
Fri Jan 21 17:09:40 EST 2011
That only works at the high voltage end of the range Paul.
A 12V DC motor will run faster as you wind the voltage up,
probably to 16 V or more until something decides it doesn't like the
volts and quits.
When you try to slow it down, you run into a problem,
it maybe works down to 9 or10 V and then says tohellwithit and stalls.
To do manageable speed-control you need pulsewidth modulated control (PWM)
that fires full voltage pulses at varying duty cycles.
That works down to maybe 20% of normal speed and then friction just
stalls it,
but it's really good above that.
12V ____ ____ ____
_| |_| |_| |_ Fast
0V
12V __ __ __
_| |____| |____| |_ Slow
0V
There is variation between brushless and non-brushless motors,
plus the bigger they are, the finer you can control them.
dave
On 1/21/2011 1:33 PM, Paul - Home wrote:
> I have buddy looking to use a car window motor to control a valve and
> its been too long since I last worked with any motors so I need a memory
> boost.
>
> The voltage applied to the motor (like the one that drives our windows)
> will control the speed of the motor, more voltage = more speed, with
> some limits, right?
>
> Paul
> #9270
>
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