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Discussions Question and Answer Forums Electric Scooter, Bike, and Go Kart Repair Forum

EVT 168 horrible motor noise

Hello I have an EVT 168 electric scooter that had a bad controller so I replaced it with one of those 24-60v universal controllers it's a 1500w brush motor and the controller it rated to 2000w well the motor works but makes a transformer sound at 1/4-3/4 throttle but totally smooth at full throttle every connection is soldered and heat shrink so it's not a bad connection could it be just a bad controller

Those lower-cost 24-60V universal controllers with one connector for the throttle and three or four thick wires that go to the battery and motor are designed with a low pulse width modification (PWM) frequency which causes most motors to make a humming or buzzing sound at lower speeds. The lower the controller's PWM frequency is the cooler the controller runs, so using the lower frequency is how they are able to make those controllers for a lower cost because they require fewer and smaller electrical components and a smaller case. The higher-cost controllers run at a higher PWM frequency that is above what humans can hear so motors run quiet at all speeds with them however these type of controllers require more and larger electrical components and larger cases so their price is higher.

that's what I figured I don't normally use these lower-cost controllers but I got it for free I like to use the Curtis 12xx series but they are expensive even used thanks

OK I see you sell a 2000w 48v brush controller I give that one a try then use the other one on my 500w bike
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