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Brush motors

The magnetic field comes from either wound coils or a permanent magnet. This type of motor has a mechanical switch or commutator which reverses the current in the armature of the machine. The "speed per torque" characteristic is constant and the slope of the speed/torque curve depends on the strength of the magnetic field.

Universal motors

Universal Motors are commutator fitted machines adapted to work with AC voltage. They can achieve high speeds. However, the speed is sensitive to the load applied. The main advantage is the flexibility to adjust speed to an appliance needs. This type of motor is widely used to drive horizontal axis washing machines and vacuum cleaners.

Permanent magnet DC motors

Permanent magnet DC Motors are commutator fitted machines in which the magnetic field source is a permanent magnet. They require a DC power source and therefore are typically used in cordless appliances. In addition speed control can be made available.

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