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I really don't think I get it.. I don't want to use a gearbox/speed reducer as suggest in the paper. If I understood you correctly you mean that I should get a 55kW/3000rpm that is rated for lower voltage 208V or 240V. For example here are 2 motors I found locally, if I would run the first...

I am free for a couple of months and I have much to do, so you can say my time doesn't worth much..

The systems I was quoted are easily 20 times the cost of doing it by myself, so it is indeed worth the trouble.

These systems are quite costly and sadly I can't afford them..

So I need a bigger VFD than the motor to overvolt the motor to get enough torque. A motor that can handle 55KW at 4000 rpm and can handle 29kW at 1500rpm. For example a 380V, 50Hz, 1500rpm, 30kW, Y connected, and rewire it as delta for half the nominal voltage which doubles the current...

I don't want to use a gearbox but the author suggests that to make the speed of the motor to be within the speed range of the engine he has at the maximum torque:

Thank you very much for the very important details. I came across a paper that describes almost exactly what I need: Paper He uses the same assumptions I made and picks a motor that is rated at 1000rp/400V even though the engine to be tested is 3800rpm while using 2:1 speed reducer/gearbox...

Wow this reply came in the right time, I actually went for a hunt locally for an induction motor and a VFD, and I did find a surplus that are really affordable.. I also did more digging and I found research someone did about almost exactly the same as I need.. and I would like to confirm what I...

I would like to make some It was intimidating for me ngl, because I've never worked with such high power (for me at least) application so I don't want to face any surprises. The tests to be carried are: Speed Control: Constant Speed, rpm increase/decrease, RPM sweep at constant load. Torque...

Thank you again. TugboatEng I see now that I need either an AVR or a fixed 60KW load bank with a DC power supply. Did you mean a constant current or a constant voltage DC power supply?. This is needed because the "Voltage drops significantly with increasing load due to armature reaction and...

Thank you guys, it is relieving to know that it can be done. As waross said I thought I would just connect the sync machine to the load bank directly. I can control the load bank with about 1KW steps, and I can control the excitation current. I am more worried about the control unit now, I...

Hello guys I am planning to make an AC dynamometer for research purposes to test PSA 4-cylinder diesel engines with the following specifications: - Power max.: 60KW. - Torque max.: 220 N.m. - Speed max.: 4500rpm speed. * Can't use the grid. * Going to use dynamic torque sensor to log power...