How to generate constant torque
How to generate constant torque
(OP)
I have an asynchronous machine.
I want to use it as a brake, it means it has to set a constant torque.
How can i do this?
I have to modulate a load resistance or capacitor? How?
I want to use it as a brake, it means it has to set a constant torque.
How can i do this?
I have to modulate a load resistance or capacitor? How?





RE: How to generate constant torque
The motor must be disconnected in good time from the mains so that it does not again accelerate in the new rotational field direction. This is mainly made automatically.
However, in order to reduce the current, suitable resistance has to be inserted in series with the supply.
See [for instance:]
http://kmc.co.rs/sites/default/files/2112f-Brake%2...
RE: How to generate constant torque
What about if I want to use Active brake?
I mean, if I want to brake setting the motor at a lower (or at worst case, reverse) speed than the other motor.
In this case, how can I control the constant torque?
How can I manage the frequency (or voltage) of the motor to control the torque?
RE: How to generate constant torque
The rotor speed (I have an encoder)
The output voltage and current
I don't have the angle or the cosphi
RE: How to generate constant torque
http://www.geindustrial.com/publibrary/checkout/DE...
RE: How to generate constant torque
If your plan is to brake continuously, as in speed control on a down hill conveyor or something, then Dynamic Braking may not be the best choice, in that case, I would look into using a more expensive vFD that is capable of Line Regenerative Braking. Line Regen Braking puts the energy from the moving load back onto the line source (energy recovery), which can be done continuously without regard to duty cycle as long as you don't exceed the current rating of the motor.
"Will work for (the memory of) salami"
RE: How to generate constant torque
RE: How to generate constant torque
Your the person they elected to do this project so they need to listen to your judgment here. Because all the discussion in the world will matter very little to the person who falls in there...
Regards,
Matt