When you feed in DC, the electromagnet functions like a conventional long term magnet and generates a magnetic field that’s generally pointing in the same direction. The commutator reverses the coil current each time the coil flips over, exactly like in a straightforward DC motor, so the coil always spins in the same path.
When you feed in AC, however, the current flowing through the electromagnet and the existing flowing through the coil both invert, exactly in step, so the force on the coil is at all times in the same direction and the engine always spins possibly clockwise or counter-clockwise. What about the commutator? The frequency of the existing changes much faster compared to the motor rotates and, since the field and the current are always in step, it doesn’t actually matter what position the commutator is definitely in at any provided moment.
Small electrical motors are found in a multitude of applications in nearly every industry because they are cleaner and less expensive to run than fuel-powered motors. They remain able to operate at high speeds and successfully produce mechanical power; however it will be in much smaller amounts compared to larger electric motors. Small motors or miniature motors are typically used in welding, small centrifuge devices, pitching machines, wheel chair, door openers, pumps, and frozen yogurt machines. Another common usage of small electrical motors is usually in the automobile accessory industry where EP motors are used to power products such as electric windows, windscreen wipers, mirrors and locking systems. In some instances, motors can be classified as fractional horsepower motors also if the horsepower exceeds one unit. If the frame size of the engine is a 42, 48, or 56, the one horsepower guideline will not apply. Due 
to their size, it may at times be easier to basically replace a engine than to repair it, but as they are simple contraptions, small electric motors are reliable devices when used because of their intended purposes.
DC motors like this are great for battery-powered toys (things such as model trains, radio-controlled vehicles, or electric shavers), but you don’t find them in lots of household appliances. Small devices (things such as coffee grinders or electric food blenders) tend to use what are called universal motors, which can be powered by either AC or DC. Unlike a simple DC motor, a universal motor has an electromagnet, rather than a permanent magnet, and it takes its power from the DC or AC power you feed in:
The small electric motor spins in different directions based about how the battery prospects are installed. These motors are typically single phase or three phase based on required result and intended application. Factors to be made when identifying EP motor make use of include: whether a motor will be needed for continuous or intermittent duty, voltage ratings, desired weight of motor, fan-cooling, adjustable speeds etc. Like all electric motors, small electric motors convert electricity into mechanical energy. They change electric energy into rotational movement by using the organic behavior of magnetism, or the attracting and repelling forces of a magnet strong enough to trigger rotation. These small motors are typically low priced and easy maintenance options for motor needs.