When you feed in DC, the electromagnet functions like a conventional permanent magnet and creates 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 simple DC motor, so the coil usually spins in the same path.
When you feed in AC, however, the 
existing flowing through the electromagnet and the current flowing through the coil both invert, exactly in step, therefore the force on the coil is usually 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 than 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 can be in at any provided moment.
Small electric motors are found in a multitude of applications in almost every industry because they’re cleaner and less costly to run than fuel-driven motors. They are still 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, little centrifuge devices, pitching machines, wheel seats, door openers, pumps, and frozen yogurt devices. Another common usage of small electrical motors is certainly in the automobile accessory industry where EP motors are accustomed to power gadgets such as electric windows, windscreen wipers, mirrors and locking systems. In some instances, motors can be categorized as fractional horsepower motors even if the horsepower exceeds one device. If the body size of the electric motor is a 42, 48, or 56, the main one horsepower guideline does not apply. Due to their size, it may at times be easier to just replace a engine than to try and repair it, but as they are simple contraptions, small electrical motors are reliable pieces of equipment when used for their intended purposes.
DC motors like this are great for battery-powered toys (things like model trains, radio-controlled cars, or electric razors), but you don’t find them in lots of household appliances. Small home appliances (things like coffee grinders or electric food blenders) have a tendency to use what are called universal motors, which can be run by either AC or DC. Unlike a straightforward DC motor, a universal motor has an electromagnet, instead of a long lasting magnet, and it requires its power from the DC or AC power you feed in:
The tiny electric motor spins in different directions based on how the battery prospects are installed. These motors are usually single phase or three phase depending on required result and intended application. Factors to be made when determining EP motor use 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 electrical motors convert electricity into mechanical energy. They change 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 trigger rotation. These little motors are typically low cost and easy maintenance choices for motor needs.
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