When you feed in DC, the electromagnet functions like a conventional long term magnet and produces a magnetic field that’s at all times pointing in the same direction. The commutator reverses the coil current each time the coil flips over, just like in a straightforward DC motor, therefore the coil always spins in the same direction.
When you feed in AC, however, the existing moving through the electromagnet and the existing moving through the coil both reverse, exactly in step, so the force upon the coil is always in the same direction and the engine always spins either clockwise or counter-clockwise. How about the commutator? The frequency of the existing changes much faster than the electric motor rotates and, since the field and the existing are always in step, it doesn’t actually matter what position the commutator is in at any given moment.
Small electric motors are used in a multitude of applications in almost every industry because they are cleaner and less expensive to perform than fuel-powered motors. They are still able to run at high speeds and efficiently produce mechanical power; nonetheless it will be in much smaller amounts in comparison to larger electric motors. Little motors or miniature motors are usually used in welding, small centrifuge devices, pitching machines, wheel chair, door openers, pumps, and frozen yogurt machines. Another common utilization of small electrical motors is certainly in the automobile accessory industry where EP motors are used to power devices such as electric home windows, windscreen wipers, mirrors and locking systems. In some instances, motors can be classified as fractional horsepower motors even if the horsepower exceeds one unit. If the frame size of the 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 basically replace a electric motor than to try and 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 excellent 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 such as coffee grinders or electrical food blenders) have a tendency to use what are called universal motors, which can be driven by either AC or DC. Unlike a straightforward DC electric motor, 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 tiny electric motor spins in various directions based about how the battery potential clients are hooked up. These motors are typically single stage or three phase depending on required output and intended application. Considerations to be produced when identifying EP motor use include: whether a electric motor will be needed for constant or intermittent duty, voltage ratings, desired weight of motor, fan-cooling, adjustable speeds etc. Like all electric motors, small electric motors convert electrical energy into mechanical energy. They modify electrical 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 small motors are typically low priced and easy maintenance options for motor needs.
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