why do some dishwashers reverse the rotation of the motor
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Brushes and commutators are used on the Universal motor which is similar to a series wound DC motor but designed to run on AC or DC. This motor is used in small appliances, portable electric tools, etc. When you run your drill motor in reverse, you reverse the polarity of the field or the armature winding.
This is not quite the same thing as reversing the polarity of the start windings on a split phase. There is also a permanent magnet DC motor which has no field winding. You merely reverse the polarity of the supply to reverse rotation. Oh, and synchronous motors use brushes and slip rings.
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