The more I think on this, given the situation, the more I think @LowQCab is right. It is a simpler approach. The question is now how to instrument it to give you the output needed. On at least 1 of the stator windings you need to measure current and generated voltage; ideally do it on all 3 since they wont be perfectly identical. The easiest way to measure the current is with a 75mV shunt, eg https://www.ebay.co.uk/itm/164828952645 inserted in one of the shorting link
You also need to measure the voltage generated, from the centre join to the shorted connection, like this...
Then you can measure current & voltage across the cycle and calculate Power Out. From that and revs you can calculate torque load.
But you will need to calibrate it,. One way is with a pulley and dropped weight.
You also need to measure the voltage generated, from the centre join to the shorted connection, like this...
Then you can measure current & voltage across the cycle and calculate Power Out. From that and revs you can calculate torque load.
But you will need to calibrate it,. One way is with a pulley and dropped weight.