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Windscreep Wiper motor madmodding

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raynerd:
I`m after a small motor turning at approximately 20-30rpm - no too much torque required as I`m attempting to make a penny pusher (arcade/slot machine style game).

I believe others have used "a 12v windscreen motor off 5v" to get an appropriate speed but I thought there would be more to it than just hooking up a dc voltage to get one of these running - can anyone any advice? My understanding is that using a 5v or 7v supply will reduce the speed but then will reduce the torque and generate heat. Is PWM the only way to go...if so what sort of a pwm controller would work?

Any help appreciated

Chris

awemawson:
Almost any small dc motor and driven by a simple pulse width modulation circuit. 555 timer giving variable mark space driving a VFET to switch the motor. Tweak the mark space to get the speed you want.

raynerd:
Cheers.
This looks cheap and may do the job!
http://www.ebay.co.uk/itm/12V-40V-10A-Pulse-Width-Modulation-PWM-DC-Motor-Speed-Control-Switch-Governor-UK-/121111837420?pt=UK_Computing_Other_Computing_Networking&hash=item1c32d3faec


I just need to find a wiper motor off ebay now. I presume any will do?

Chris

chipenter:
Have a look in Maplins http://www.maplin.co.uk/components/motors-and-servos/motors-and-gearboxes various ratios available .

Bluechip:
Chris
 
I have some similar to this:
 
http://cpc.farnell.com/mfa/940d1001/motor-gear-4-5-15v-100-1/dp/HK00908
 
Built on g/box, 12V IIRC ( dunno about the output revs ..can check tomorrow re: volts/o/p revs if you like ).
 
Ripped out of scrapped machines when I was at work  on someone's payroll.
 
Dave BC
 
 
EDIT  Done it ...  :thumbup:
 
Found one
 
PITTMAN with  96:1 G/box
 
13V   about 70mA    26 and a few scratty bits  RPM
 
?????

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