When you feed in DC, the electromagnet functions like a conventional permanent magnet and produces a magnetic field that’s constantly pointing in the same direction. The commutator reverses the coil current each time the coil flips over, just like in a simple DC motor, therefore the coil often spins in the same path.
When you feed in AC, however, the current moving through the electromagnet and the current flowing through the coil both invert, exactly in step, so the force upon the coil is at all times in the same direction and the engine always spins possibly clockwise or counter-clockwise. How about the commutator? The frequency of the existing changes much faster than the engine rotates and, because the field and the current are always in stage, it generally does not actually matter what position the commutator can be in at any given moment.
Small electric motors are found in a multitude of applications in almost every industry because they are cleaner and less expensive to run than fuel-run motors. They remain able to run at high speeds and effectively produce mechanical power; nonetheless it will maintain much smaller amounts in comparison to larger electric motors. Little motors or miniature motors are usually used in welding, little centrifuge devices, pitching machines, wheel chair, door openers, pumps, and frozen yogurt devices. Another common usage of small electrical motors is in the auto accessory industry in which EP motors are accustomed to power products such as electric windows, windscreen wipers, mirrors and locking systems. In some cases, motors can be classified as fractional horsepower motors even if the horsepower exceeds one device. If the frame size of the engine is a 42, 48, or 56, the one horsepower guideline does not apply. Because of their size, it may 
sometimes be easier to simply replace a engine than to repair it, but because they are basic contraptions, small electrical 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 appliances (things such as coffee grinders or electrical food blenders) have a tendency to use what are known as universal motors, which may be powered by either AC or DC. Unlike a straightforward DC engine, a universal motor comes with an electromagnet, rather than a long lasting magnet, and it takes its power from the DC or AC power you feed in:
The small electric motor spins in various directions based on how the battery leads are installed. These motors are typically single stage or three phase based on required output and intended application. Factors to be produced when identifying EP motor use include: whether a engine will be required for continuous or intermittent duty, voltage rankings, desired weight of electric motor, fan-cooling, adjustable speeds etc. Like all electric motors, small electrical motors convert electrical energy into mechanical energy. They modify 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 little motors are typically low priced and easy maintenance choices for motor needs.