Electric Powered Wheelchair
Why would an electric wheelchair speed up when it's been used heavily?
A power wheelchair for the sport of power soccer uses gel batteries, and a motor controller with PWM output. The controller is programmed to give a maximum speed of 6 mph to meet game rules, but after half an hour of play, the forward speed has increased to over 6.5 mph, breaking the rules of the game.
The maximum speed of the chair is 8mph when programmed to 100%, but the programming does not change during the course of the game. What could be causing this drift in speed?
Edit- as of this evening I have measured the voltage after "warm up", and it was actually lower than the starting point. I thought voltage increasing with warming was a great suggestion, but with an averaged output of 15 to 20 amps, and a resistance of 0.003 ohms, the battery just doesn't heat up that much.
sometimes the programming fails. Just happens.
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