Dynamic load for 3 Phase PMSM

[Harry D]

I am in the process of testing a Permanent Magnet Synchronous Motor driverof about 1 KW. I need a load for said test. I have a 3 phase VFD converter/controller that can control speed and torque with constant V/F ratio. Is it possible to couple an 3 phase AC induction motor (IM) driven by the VFD controller to the shaft of the PMSM and use it to load the PMSM? Let say I set the IM (load) to 1K RPM and then slowly bring up the PMSM and driver. The PMSM will act as a generator with it's back EMF charging its bridge driver bulk cap. As the PMSM driver exerts more power, will it force the IM to slip more and appear to be a load? As you can see I am not expert in this soI need more enlightenment?

Thanks, Harry

 

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Conservation of energy: that 1KW has got to go somewhere. The VFD
controller might be able to absorb the power steady-state, but it
might not. You could ask the manufacturer. If it has a small heat
sink, it probably won't work.

yeh it will probably go boom..

if not the PMSM driver from over voltage while generating
then the VFD driving the induction motor, once the slip gets negative

One nice mechanical load is an induction motor with DC applied to its
input. The rotor dissipates the power. We used to do that on reel-reel
tape drives, for drag on the feed reel and fast dynamic braking.

a car dyno is usually some combination of a big metal cylinder acting
as
a inertial load, and a magnetic brake as a static load

I guess dc on an induction motor sorta works like a magnetic brake

or just get another identical PM motor and some big resistors


-Lasse