Understanding the flux function of the in built speed controller(AC) block in Simulink

I was hoping to use the speed controller block with flux reference in Simulink and the flux function has an expression "bs*nf/u(1)". Where "nf" is a specified nominal flux value and "u" is the input to the function block. My problem here is the parameter "bs". The speed controller doesn't allow for this parameter value to be set if you were to double-click the block. And I don't know what the description is. The parameter "bs" is also used in a previous saturation as a lower limit hence it must be important but again I reiterate there is no description of this parameter or I have not seen it. Please attached images.

Image 1: Inner block diagram of the speed controller

Image 2: Inner block of Flux table (Please pay attention to the expression in the function block)

Image 3: Function Block Parameter of the Saturation block

I look forward to any helpful answers or referrals.

Answer 1

[pravin borkar]

The bs stands for base speed. when IM is operated in field weakening mode the approximate equation will be base speed * nominal flux divided by rotor speed. if the speed is less than or equal to rated, the flux is kept at its rated value. However, for speeds higher than rated, the flux should be reduced to run the machine in a constant-power mode by field weakening. Go through any field weakening article for more reference.

[quentin hay]

love your work