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Use asynchronous machine block as a generator

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Harry Knoblauch
Harry Knoblauch on 7 Jul 2020
Answered: Joel Van Sickel on 4 Aug 2020
I am trying to model a motor for a crane, and as part of that am looking to model regenerative braking capabilities of the motor, upon lowering an object. Currently however, I can't manage to output any generated power from the asynchronous machine block, despite the fact that I am inputting a negative speed, hence it should be operating in a generator mode.
The above screenshots show my model, and my asynchronous machine parameters. It is a squirrel cage motor, witha rotor reference frame. I am inputting a speed curve made by my speed controller, however, the no voltage is developed in the asynchronous machine, despite the fact that it recognises an input speed.
Any advice on how i can use this machine as a generator would be greatly appreciated.

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Answers (1)

Joel Van Sickel
Joel Van Sickel on 4 Aug 2020
Hello Harry,
that topology cannot generate electricity as the motor needs an external source of electricity to generate a magnetic field. You might consider a PMSM for this topology if you want it to act as a generator. That or consider a bi-directional inverter instead of a rectifier.
Regards,
Joel

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