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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Motorman on February 25, 2020, 06:37:00 PM

Title: Motor Drag
Post by: Motorman on February 25, 2020, 06:37:00 PM

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Title: Re: Motor Drag
Post by: Tim Wescott on February 25, 2020, 07:28:05 PM

Because -- Science!

Any permanent-magnet motor will act like a generator if you spin it.  When the leads are open, the voltage generated just sits there on the wires, but when you short them, it goes to developing current in the windings.  That current makes torque, which resists you turning the motor.

Title: Re: Motor Drag
Post by: John Rist on February 25, 2020, 10:43:04 PM

That's how the brakes in an ESC works.  It shorts the leads together causing the motor to become a generator.