VEX motors question - Chief Delphi

06-12-2005, 18:26

billbo911

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Re: VEX motors question

Quote:

Originally Posted by JasonQ

Hi,

Why do the VEX motors have 3 wires? There are the positive and common leads, but what is the third for?

Thanks,

Jason

The third wire, I believe it is white, is the control signal wire. It carries a PWM signal. It is a pulse train at about 50-60 Hz. Each pulse will vary from 1ms to 2ms with neutral being 1.5ms. 1ms pulses drive the motor at full speed reverse, 2ms drives the motor at full speed forward. The positive wire caries the battery voltage at a constant dc voltage approximately equal to the 7.2v battery.

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