Electric motors are everywhere in your house, almost every mechanical movement that you see around you is caused by an AC (alternating current) or DC (direct current) electric motor. A simple motor has six parts :
Armature or rotor
DC power supply of some sort Major types of electric motors are DC motors (direct current) and AC motors (Alternating current). Direct current generators produce electric current that always flows in the same direction while Alternating current generators or alternators produce electric current that reverses direction many times every seconds. An electric motor is all about magnets and magnetism: A motor uses magnets to create motion. The fundamental law of all magnets is opposites attract and likes repel. Inside an electric motor, these attracting and repelling forces create rotational motion. In the diagram, we can see two magnets in the motor: The armature (or rotor) is an electromagnet, while the field magnet is a permanent magnet (the field magnet could be an electromagnet as well, but in most small motors it isn't in order to save power).
The physical principle of production of mechanical force by the interactions of an electric current and a magnetic field was known as early as 1821. Electric motors of increasing efficiency were constructed throughout the 19th century, but commercial exploitation of electric motors on a large scale required efficient electrical generators and electrical distribution networks. Some devices, such as magnetic solenoids and loudspeakers, although they generate some mechanical power, are not generally referred to as electric motors, and are usually termed actuators and transducers.
1. To identify the characteristics of Alternating Current (AC) and Direct Current (DC) motor.
2. Determine the operation of Alternating Current (AC) and Direct Current (DC) motor.
The rotating magnetic induction field principle used in...