Permanent-magnet electric motor | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-16

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Brushed_DC_electric_motor


00:01:04 1 Simple two-pole DC motor
00:08:52 2 The commutating plane
00:09:28 2.1 Compensation for stator field distortion
00:10:49 3 Motor design variations
00:11:00 3.1 DC motors
00:11:17 3.2 Wound stators
00:12:15 3.3 Permanent-magnet motors
00:13:27 3.4 Axial field motors
00:14:19 4 Speed control
00:14:35 4.1 Series-parallel
00:15:24 4.2 Field weakening
00:16:22 4.3 Chopper
00:17:05 4.4 Ward Leonard
00:20:17 5 Torque and speed of a DC motor
00:22:40 5.1 Basic properties
00:23:16 5.2 Counter EMF equation
00:24:02 5.3 Voltage balance equation
00:24:21 5.4 Torque equation
00:24:25 5.5 Speed equation
00:24:54 6 Torque and speed characteristics
00:24:59 6.1 Shunt wound motor
00:25:25 6.2 Series wound motor
00:25:29 6.3 Permanent magnet motor
00:26:00 7 Protection
00:26:04 8 DC motor starters
00:26:16 8.1 Manual-starting rheostat
00:26:52 8.2 Three-point starter
00:28:39 8.3 Four-point starter
00:29:09 9 See also
00:32:14 10 References
00:33:19 11 Bibliography
00:34:49 12 External links
00:36:25 Four-point starter
00:37:18 See also



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SUMMARY
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A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. Brushed motors were the first commercially important application of electric power to driving mechanical energy, and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. Brushed DC motors can be varied in speed by changing the operating voltage or the strength of the magnetic field. Depending on the connections of the field to the power supply, the speed and torque characteristics of a brushed motor can be altered to provide steady speed or speed inversely proportional to the mechanical load. Brushed motors continue to be used for electrical propulsion, cranes, paper machines and steel rolling mills. Since the brushes wear down and require replacement, brushless DC motors using power electronic devices have displaced brushed motors from many applications.