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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. In this article we'll look at both types. By understanding how a motor works you can learn a lot about magnets, electromagnets and electricity in general.
- A very small electric motor has two small permanent magnets, a commutator, two brushes, three poles, and an electromagnet made by winding wire arou...
- A DC electric motor converts direct current electrical energy into mechanical energy unlike the AC version that uses alternating current.
- A simple motor has six parts: an armature or rotor, a commutator, brushes, an axle, a field magnet, and a DC power supply of some kind.
- Under test conditions an electric motor can last between 15 to 20 years, provided it is used under normal operating conditions.
- AC motors are generally more powerful and require less maintenance, however, DC motors tend to be highly efficient. The application of the electric...
- How An Electric Motor Works—In Theory
- How An Electric Motor Works—In Practice
- Universal Motors
- Other Kinds of Electric Motors
The link between electricity, magnetism, and movement was originallydiscovered in 1820 by French physicist André-MarieAmpère(1775–1867) and it's the basic science behind an electric motor. But ifwe want to turn this amazing scientific discovery into a more practicalbit of technology to power our electric mowers and toothbrushes, we've got to take i...
There are two ways to overcome this problem. One is to use a kind ofelectric current that periodically reverses direction, which is knownas an alternating current (AC).In the kind of small, battery-poweredmotors we use around the home, a better solution is to add a componentcalled a commutator to theends of the coil. (Don't worry about the meaningl...
DC motors like 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 appliances (things like coffee grinders or electric food blenders) tend to use what are called universal motors, which can be powered by either AC or DC. Unlike a ...
Photo: Electric motors come in all shapes and sizes. This school bus hashad its old dirty diesel engine replaced with a large electric motor(white box) to reduce air pollution.Photo by Dennis Schroeder courtesy of NREL (National Renewable Energy Laboratory). In simple DC and universal motors, the rotor spins inside the stator. The rotor is a coil c...
Electric motors operate on one of three physical principles: magnetism, electrostatics and piezoelectricity. In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise to a force and thus a torque on the motor shaft. One or both of these fields changes as the rotor turns.
Learn about and revise electromagnetism, the motor effect and its applications in motors with GCSE Bitesize Physics.
Sep 11, 2024 · Electric motor, any of a class of devices that convert electrical energy to mechanical energy, usually by employing electromagnetic phenomena. Most electric motors develop their mechanical torque by the interaction of conductors carrying current in a direction at right angles to a magnetic field.
- Gordon R. Slemon
Feb 25, 2021 · These motors are used everywhere from pumping the water we drink, to powering elevators and cranes, even cooling nuclear power stations. So, we’re going to look inside one and learn in detail, exactly how they work in this article.
An electric motor is a device used to convert electricity into mechanical energy —opposite to an electric generator. They operate using principles of electromagnetism, which shows that a force is applied when an electric current is present in a magnetic field.
