When you feed in DC, the electromagnet functions like a conventional permanent magnet and creates a magnetic field that’s at all times pointing in the same direction. The commutator reverses 
the coil current every time the coil flips over, just like in a simple DC motor, therefore the coil at all times spins in the same direction.
When you feed in AC, however, the current flowing through the electromagnet and the existing moving through the coil both reverse, exactly in step, so the force upon the coil is at all times in the same direction and the motor always spins either clockwise or counter-clockwise. What about the commutator? The frequency of the existing changes much faster compared to the electric motor rotates and, since the field and the existing are always in stage, it generally does not actually matter what placement the commutator is in at any provided moment.
Small electrical motors are used in a multitude of applications in nearly every industry because they are cleaner and less costly to run than fuel-driven motors. They remain able to run at high speeds and effectively produce mechanical power; however it will be in much smaller amounts compared to larger electric motors. Little motors or miniature motors are typically used in welding, little centrifuge devices, pitching devices, wheel chair, door openers, pumps, and frozen yogurt devices. Another common usage of small electric motors can be in the auto accessory industry where EP motors are used to power gadgets such as electric home windows, windscreen wipers, mirrors and locking systems. In some instances, motors can still be categorized as fractional horsepower motors also if the horsepower exceeds one device. If the framework size of the motor is a 42, 48, or 56, the one horsepower guideline does not apply. Due to their size, it may at times be easier to simply replace a motor than to try and repair it, but because they are simple contraptions, small electric motors are reliable pieces of equipment when used for his or her intended purposes.
DC motors like this are great for battery-powered toys (things such as model trains, radio-controlled cars, or electric razors), nevertheless, you don’t find them in many household appliances. Small appliances (things such as coffee grinders or electric food blenders) tend to use what are known as universal motors, which may 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 requires its power from the DC or AC power you feed in:
The small electric motor spins in different directions based about how the battery potential clients are hooked up. These motors are typically single stage or three phase based on required output and intended application. Considerations to be made when identifying EP motor make use of include: whether a electric motor will be needed for constant or intermittent duty, voltage rankings, desired weight of electric motor, fan-cooling, adjustable speeds etc. Like all electrical motors, small electric motors convert electricity into mechanical energy. They modify electric powered energy into rotational motion by using the organic behavior of magnetism, or the attracting and repelling forces of a magnet solid enough to cause rotation. These little motors are typically low cost and easy maintenance options for motor needs.