Variable speed control of multiple dc motors

  • Thread starter dubya_80
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  • #26
NascentOxygen
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I am uneasy at your plan to use relays to reverse the load. Without spike suppression, opening the motor under load may produce switching transients which could kill the PWM controller.

Some controllers apparently have an inbuilt reversing switch, if I read this advert correctly. http://www.ebay.com.au/itm/Hot-Reve...Regulator-Controller-Switch-New-/331614500577
 
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  • #27
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I guess I'll just test this unit in one direction and if it tests out ok just order a second one for reverse. .
 
  • #28
NascentOxygen
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Did you ask the seller for a link to a data sheet? It's hard to believe he would be buying these from a supplier who has no additional information on them.
 
  • #29
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Well i just went by the info on the ad itself. I added a cooling fan to be safe and crossed my fingers! I got lucky with the 4 motors seeming to cancel each others electrical noise! I put the car on crates and when I put load on two wheels the other two just slowed to match and there was barely any voltage spike at all!
Thanks everyone for your help!
 

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