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Originally Posted by greencactus3
brushless motors only spin in one direction. it will be difficult for rookie teams to create a gearbox w/ a reverse to use with brushless motors. and also they tend to be costly.. its like asking why we cant have combalt magnet motors?
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There are brushless motors that spin in both directions. The capstan motor in your VCR is one (capstan drives the tape and yes it is a nautical term.) A brushless DC motor is simply an AC motor with all the drive electronics inside the case. These motors generally are multiphase (i.e.three phase or more) and are able to produce pretty high torques and very good speed control. The tradeoff is they are usually expensive so they are only used where the precise control is need. You will find many fans in the brushless variety these days. This is more to prevent brush noise (i.e. radio frequency hash) from entering sensitive electronic equipment than the need for precise control.
Everything has a tradeoff, you just need to use the right ones to your advantage.