“Is it possible to have an electric motor without a brush?”
The workings of most DC motor systems are simple and efficient, but with one serious flaw, their brushing infrastructure.
What does this mean?
Well,lets first look at how a D.C motor works. A circular structure of permanent magnets create a magnetic field, and an electromagnet based central rotor will interact with this magnetic field when current is applied to it. This magnetic field will be able to flip the rotor 180 degrees, by which time the polarity of the electromagnet must change to continue. This is accomplished by a mechanical brush located at the center of the rotor. Even though this brush is absolutely necessary for the electric motor to work, it comes with some large drawbacks. This added machinery effectively limits the speed of the motor, is very prone to wearing out (which makes upkeep much more expensive), and makes the temperature much harder to cool.
The solution? How about turn the whole machine inside out! By placing the electromagnets on the outside and the permanent magnets on the rotor and using a computer system to control everything, the motor will have a momentous increase in power generation. Engineers have termed this type of motor an electric motor.