The Shop > Electronics & IC Programing

Windscreep Wiper motor madmodding

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mattinker:
Very good point VT, I'll do a test when the controller arrives, I think I have a window winder motor some where. I don't have a seven year old, or electric windows!

Regards, Matthew

AdeV:

--- Quote from: raynerd on July 30, 2013, 05:17:26 PM ---
My understanding is that using a 5v or 7v supply will reduce the speed but then will reduce the torque and generate heat.


--- End quote ---

Just to go back to this for a moment.... I'm pretty sure that  you won't get extra heat running a motor at a reduced voltage. Reduced speed & torque, yes. If you use a resistor to drop the voltage, then the "wasted" volts will generate heat in the resistor.

Consider - reducing the voltage of a simple DC motor (which is all a windscreen or window motor is) is exactly how your old train set or scalextric cars work[ed]... (before the days of DCC & PWM).

Of course, PWM is better because a) the motor always generates peak torque for the speed it's going at, and b) it overcomes "stiction" much better than gradually increasing the voltage - which is why PWM train controllers do a much better job of controlling a train at low speed than a boggo rheostat.

vtsteam:
Chris -- I just tested the windscreen motor and speed controller setup. I get:

1.6 A @ full speed, 60 RPM
.55 A @ 30 rpm
.09 A @ lowest speed (3.5 RPM)

kayz1:
Chriss, i have a Nissan Micra rear screen motor and that controller on my mill as a table drive, it has had some abuse from me with no ill effects on it for the last year. Oh! and it runs from a piddley little transformer to.
 Lyn.

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