When you feed in DC, the electromagnet works like a conventional long term magnet and produces a magnetic field that’s always pointing in the same direction. The commutator reverses the coil current each time the coil flips over, just like in a straightforward DC motor, so the coil constantly spins in the same path.
When you feed in AC, however, the current moving through the electromagnet and the current moving through the coil both invert, exactly in step, so the force upon the coil is always in the same direction and the electric motor always spins possibly clockwise or counter-clockwise. What about the commutator? The frequency of the current changes much faster compared to the motor rotates and, since the field and the current are always in stage, it doesn’t actually matter what position the commutator is in at any provided moment.

Small electric motors are found in a wide variety of applications in almost every industry because they are cleaner and less costly to run 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 in comparison to larger electrical motors. Small motors or miniature motors are typically used in welding, little centrifuge devices, pitching machines, wheel seats, door openers, pumps, and frozen yogurt machines. Another common usage of small electric motors is usually in the automobile accessory industry where EP motors are accustomed to power devices such as electric windows, windscreen wipers, mirrors and locking systems. In some instances, motors can still be classified as fractional horsepower motors actually if the horsepower exceeds one device. If the body size of the motor is a 42, 48, or 56, the one horsepower guideline will not apply. Because of their size, it may sometimes be easier to simply replace a electric motor than to try and repair it, but because they are simple contraptions, small electric motors are reliable devices when used because of their intended purposes.
DC motors such as this are great for battery-powered toys (things like model trains, radio-controlled cars, or electric shavers), 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 known as universal motors, which can be powered by either AC or DC. Unlike a simple DC motor, a universal motor comes with 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 on how the battery network marketing leads are installed. These motors are typically single stage or three phase depending on required result and intended application. Factors to be made when determining EP motor make use of include: whether a motor will be needed for continuous or intermittent duty, voltage rankings, desired weight of engine, 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 natural behavior of magnetism, or the attracting and repelling forces of a magnet solid enough to trigger rotation. These little motors are typically low priced and easy maintenance choices for motor needs.