Mechanical input in asynchronous machine

Hi guys, i need help with basic problem

I have a asyncronous machine, squirrel-cage, i need to simulate the machine with Speed w in mechanical input When i simulate with Torque Tm, i dnt have problem, but i cant simulate with the parametres w.

Matlab help dont explain anything :( Mechanical input Select the torque applied to the shaft or the rotor speed as a Simulink® input of the block, or to represent the machine shaft by a Simscape™ rotational mechanical port.

Select Speed w to specify a speed input, in rad/s or in pu, and change labeling of the block input to w. The machine speed is imposed and the mechanical part of the model (Inertia J) is ignored. Using the speed as the mechanical input allows modeling a mechanical coupling between two machines.

What i need to put in gain??

sorry for my english :(

Answer 1

[Sebastian Castro]

The units of speed depend on whether you're using a pu or an SI block.

If using pu (Per Unit), then a speed of 1 pu will rotate the machine such that the electrical waveform generated is at the nominal machine frequency (e.g., 60 Hz).

If using rad/s , then you have to take care of the conversion yourself. To generate nominal frequency, the mechanical speed should be the nominal frequency (in rad/s, so factor of 2*pi is in there) divided by the number of pole pairs in the machine. For example, if you had 6 pole pairs and nominal frequency of 60 Hz, then angular velocity is 2*pi*60/6.

- Sebastian