Quote:
Originally Posted by timytamy
The only non-symetric motor that I can think of are the window motor/snow blower/van door style motors. I can't visualize how the mechanics of it would change their characteristics in CW or CCW but I'd be curious to know if anyone has tested/has any data on this.
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In directionally biased motors, the angles at which the coils are switched on and off are optimized for one direction. this leads to degraded performance in the opposite direction. In unbiased motors, performance is degraded equally in both directions since it isn't optimised for either direction.
The drill motors used in most drivetrains prior to 2005 had a CCW bias when viewed from the the shaft end. This is because most drill bits are designed to cut in that direction. As a result, it was common to see the drive motors mounted on the inside of one side and the outside of the other. This allowed the motors on both sides to turn in the same direction (and thus provide similar amounts of power) while driving straight forward.