Using Inductor and Electronic Load Instead of a Permanent Magnet Synchronous Motor (PMSM)
Electronic loads are non-linear and contain capacitors. They would not make good test loads. There is probably a way to control the power board that would allow limited testing with inductive loads. You may be able to program some fixed switching sequences.
You should also see if you could find some heating appliances that you could use for resistive loads. If you can find enough incandescent bulbs, they might work. The test load should have the same impedance for each phase. You might be able to construct resistors with pieces of stainless steel.