Hi!
I am trying to model a 2D short circuit squirrel cage induction motor in COMSOL v4.3a using the rotating machinery module. My goal is to get a nice distributed electromagnetic field in the motor. It works when I am making a stationary simulation. I have also tried to make a time varying sweep at no load which means that no current should be induced in the rotor bars and the rotor is moving synchronously. The field only gets nice distributed if I force the current to become zero by typing in 0A.
The problem is that I am not taking care of the short circuit ring as I am modeling in 2D. In order to include these effects, I want to couple an external circuit just as Hartman and Escarela-Perez did and couple it to the FEM model using a single turn coil domain. I have uploaded the links for their papers, see below.
Escarela-Perez, figure2 shows the equivalent circuit of the squirrel cage. The ciruict is short circuited in the figure. Is it enough to couple the gray fields (38 in my case because my motor has 38 rotor bars) to a “single turn coil domain”? I’ve got to put ground somewhere also, right?!
Hartman, figure4 shows a similar circuit. This circuit is harder for me to understand. I guess they are only modeling one pole but I don’t understand how to implement this at all.
I want to do this as simple as possible, I would prefer to use an external circuit instead of the “Global ODEs and DAEs” interface. I think that my main problem is that I don’t completely understand the circuit and how to implement it.
Hartman: www.comsol.com/offers/conferen.../file/14397_hartmann_paper.pdf
Escarela-Perez: www.comsol.com/papers/4959/
Thanks in advance, I really appreciate your help.
I am trying to model a 2D short circuit squirrel cage induction motor in COMSOL v4.3a using the rotating machinery module. My goal is to get a nice distributed electromagnetic field in the motor. It works when I am making a stationary simulation. I have also tried to make a time varying sweep at no load which means that no current should be induced in the rotor bars and the rotor is moving synchronously. The field only gets nice distributed if I force the current to become zero by typing in 0A.
The problem is that I am not taking care of the short circuit ring as I am modeling in 2D. In order to include these effects, I want to couple an external circuit just as Hartman and Escarela-Perez did and couple it to the FEM model using a single turn coil domain. I have uploaded the links for their papers, see below.
Escarela-Perez, figure2 shows the equivalent circuit of the squirrel cage. The ciruict is short circuited in the figure. Is it enough to couple the gray fields (38 in my case because my motor has 38 rotor bars) to a “single turn coil domain”? I’ve got to put ground somewhere also, right?!
Hartman, figure4 shows a similar circuit. This circuit is harder for me to understand. I guess they are only modeling one pole but I don’t understand how to implement this at all.
I want to do this as simple as possible, I would prefer to use an external circuit instead of the “Global ODEs and DAEs” interface. I think that my main problem is that I don’t completely understand the circuit and how to implement it.
Hartman: www.comsol.com/offers/conferen.../file/14397_hartmann_paper.pdf
Escarela-Perez: www.comsol.com/papers/4959/
Thanks in advance, I really appreciate your help.