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| Re: How Do AC Motors Provide DC Power During Regenerative Braking? (1648016) | |||
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Re: How Do AC Motors Provide DC Power During Regenerative Braking? |
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Posted by Stephen Bauman on Wed Apr 29 20:47:35 2026, in response to Re: How Do AC Motors Provide DC Power During Regenerative Braking?, posted by AlM on Wed Apr 29 17:22:05 2026. If electric voltage is applied to a motor, it can make wheels move forward and accelerate a train.Other than a permanent magnet DC motor, there are 2 windings. One is stationary, the other is on the rotor. The stationary winding produces a magnetic field that is equivalent to the permanent magnet motor. When a voltage is also applied to the rotor winding, then it becomes a motor. If voltage is applied only to the non-moving winding and the rotor is rotated, it becomes a generator. If current is drawn from the rotor winding, then the rotor will encounter a torque that will oppose the rotor's continued rotation. The magnitude of the torque is proportional to the rotor's rotating speed. If the rotor winding is not connected to anything (open circuit), there will be no opposing torque within the motor other than bearing friction. The automobile equivalent would be taking your foot off the gas pedal, but not stepping on the brake. There is still engine braking, if the car is in gear. The equivalent would be for the driver to place the car in neutral or depress the clutch. Keeping the car in gear and releasing the accelerator is equivalent to either dynamic or regenerative braking. The difference between dynamic and regenerative braking is where the generator's power is dissipated. If it's used to store energy energy that can be converted back into electrical energy, or directly powers another motive device, then it's regenerative braking. If it's dissipated as heat into atmosphere then it's dynamic braking. |
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