Quote:
Originally Posted by hcarry
The intent would not to be to place the circuit between a speed controller and a motor. Rather, it would only reverse the effective battery polarity to a motor. Our intent is to build a telescopic arm to hook the bar so we can winch ourselves up. In order to do so, I need to spin a motor in one direction to extend and then reverse the polarity to retract it. The motor wouldn't even be connected to a speed controller. In this case, if the answer is still NO, can this functionality be accomplished with simple 12V relays?
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That would be illegal. Per the rules, ALL motors must be driven through an approved motor controller (victor, jaguar, spike, or digital sidecar PWM outs for servo's). See <R55>.
The motor you use and the power requirements will determine what motor controller you need to use. If it'll draw under 20 Amps (which is possible for an arm if the winch that holds the robot's weight is separate), use a Spike relay - that will do exactly what you want. If it's over 20 Amps (for example the motor is part of the winch that holds the robot up as well), then you'll have to use a Victor or Jaguar, as the Spikes are only rated to 20 Amps.