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| Re: How Do AC Motors Provide DC Power During Regenerative Braking? (1648012) | |||
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Re: How Do AC Motors Provide DC Power During Regenerative Braking? |
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Posted by Bill West on Wed Apr 29 16:26:27 2026, in response to Re: How Do AC Motors Provide DC Power During Regenerative Braking?, posted by AlM on Wed Apr 29 13:29:28 2026. It’s a language weakness.In the 1840s railroads had hand brakes that created mechanical friction between the shoe and the wheel. Although never called resistance it was indeed friction “resistance” braking. In the 1880s? Westinghouse used air to wind up the brakes, it was called air brakes. In the 1920s? catenary powered locomotives reconnected the motors to back feed into the catenary. It was called regenerative braking. In the 1940s? diesel electric locomotives reconnected the motors to an electric resistance (resistors) arranged in a grid. It was called dynamic braking. In the present era, power electronics allows several combinations of these ideas to be applied on a loco or MU car. Given that flexibility it has now become common to distinguish whether an MU car uses regenerative or dynamic braking by referring to the “feeding the motors to the resistor grids” mode as having the electrical resistance as the destination for the energy. IE when in dynamic braking, the car uses “resistance braking” equipment. This is electrical “resistance”. I think there are many places now where a new person, not knowing enough history, invents new word uses when perfectly good phrases already exist. Bill |
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