Electrical motor | Wikipedia audio article
Channel: Subhajit Sahu
Date: 2019-01-15

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electric_motor


00:02:07 1 History
00:02:16 1.1 Early motors
00:04:54 1.2 DC motors
00:10:16 1.3 AC motors
00:15:10 2 Components
00:15:19 2.1 Rotor
00:15:50 2.2 Bearings
00:16:20 2.3 Stator
00:16:49 2.4 Air gap
00:17:27 2.5 Windings
00:18:31 2.6 Commutator
00:19:26 3 Motor supply and control
00:19:36 3.1 Motor supply
00:20:07 3.2 Motor control
00:20:42 4 Major categories
00:24:51 5 Self-commutated motor
00:25:01 5.1 Brushed DC motor
00:25:29 5.1.1 Electrically excited DC motor
00:30:13 5.1.2 Permanent magnet DC motor
00:31:56 5.2 Electronic commutator (EC) motor
00:32:06 5.2.1 Brushless DC motor
00:35:40 5.2.2 Switched reluctance motor
00:36:37 5.3 Universal AC/DC motor
00:39:30 6 Externally commutated AC machine
00:40:13 6.1 Induction motor
00:40:22 6.1.1 Cage and wound rotor induction motor
00:43:53 6.1.2 Torque motor
00:45:42 6.2 Synchronous motor
00:47:56 6.3 Doubly-fed electric machine
00:49:02 7 Special magnetic motors
00:49:12 7.1 Rotary
00:49:20 7.1.1 Ironless or coreless rotor motor
00:52:18 7.1.2 Pancake or axial rotor motor
00:55:46 7.1.3 Servo motor
00:57:50 7.1.4 Stepper motor
01:01:55 7.2 Linear motor
01:02:45 8 Comparison by major categories
01:02:55 9 Electromagnetism
01:03:05 9.1 Force and torque
01:04:12 9.2 Power
01:07:02 9.3 Back emf
01:08:10 9.4 Losses
01:08:40 9.5 Efficiency
01:10:50 9.6 Goodness factor
01:13:21 10 Performance parameters
01:13:30 10.1 Torque capability of motor types
01:18:14 10.2 Continuous torque density
01:19:54 10.3 Continuous power density
01:20:13 11 Acoustic noise and vibrations
01:20:57 12 Standards
01:23:06 13 Non-magnetic motors
01:24:59 14 See also



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SUMMARY
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An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and winding currents to generate force in the form of rotation. Electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators. An electric generator is mechanically identical to an electric motor, but operates in the reverse direction, accepting mechanical energy (such as from flowing water) and converting this mechanical energy into electrical energy.
Electric motors may be classified by considerations such as power source type, internal construction, application and type of motion output. In addition to AC versus DC types, motors may be brushed or brushless, may be of various phase (see single-phase, two-phase, or three-phase), and may be either air-cooled or liquid-cooled. General-purpose motors with standard dimensions and characteristics provide convenient mechanical power for industrial use. The largest electric motors are used for ship propulsion, pipeline compression and pumped-storage applications with ratings reaching 100 megawatts. Electric motors are found in industrial fans, blowers and pumps, machine tools, household appliances, power tools and disk drives. Small motors may be found in electric watches.
In certain applications, such as in regenerative braking with traction motors, electric motors can be used in reverse as generators to recover energy that might otherwise be lost as heat and friction.
Electric motors produce linear or rotary force (torque) and can be distinguished from devices such as magnetic solenoids and loudspeakers that convert electricity into motion but do not generate usable mechanical force, which are respectively referred to as actuators and transducers.