When you feed in DC, the electromagnet functions like a conventional long lasting magnet and creates a magnetic field that’s constantly 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 moving through the electromagnet and the existing flowing through the coil both invert, exactly in step, therefore the force on the coil is at all times in the same direction and the electric motor always spins either clockwise or counter-clockwise. What about the commutator? The frequency of the existing changes much faster than the engine rotates and, since the field and the current are always in step, it generally does not actually matter what position the commutator is definitely in at any given moment.
Small electric motors are found in a wide variety of applications in nearly every industry because they are cleaner and less costly to perform than fuel-powered motors. They remain able to run at high speeds and efficiently 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, little centrifuge devices, pitching machines, wheel chair, door openers, pumps, and frozen yogurt machines. Another common utilization of small electric motors is usually in the auto accessory industry in which EP motors are accustomed to power products such as electric home windows, windscreen wipers, mirrors and locking systems. In some cases, motors can be categorized as fractional horsepower motors even if the horsepower exceeds one device. 
If the body size of the engine is a 42, 48, or 56, the one horsepower guideline does not apply. Because of their size, it may at times be easier to merely replace a motor than to try and repair it, but as they are simple contraptions, small electric motors are reliable pieces of equipment when used because of their intended purposes.
DC motors like this are great for battery-powered toys (things like model trains, radio-controlled vehicles, or electric razors), but you don’t find them in many household appliances. Small devices (things like coffee grinders or electrical food blenders) tend to use what are called universal motors, which may be driven by either AC or DC. Unlike a straightforward DC motor, a universal motor has an electromagnet, instead of 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 about how the battery prospects are installed. These motors are usually single phase or three phase based on required result and intended application. Considerations to be made when identifying EP motor use include: whether a engine will be needed for continuous or intermittent duty, voltage ratings, desired weight of engine, fan-cooling, adjustable speeds etc. Like all electric motors, small electric motors convert electrical energy into mechanical energy. They modify electric powered 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.