Hi, i have bought two water cooled car alternators, for remake a rotor with magnets. But i measured parameters like no load current, revs and BEMF. And its not bad at all. I wonder if it's not worth using as is and not remake it. Because I will have a variable "magnet strength" = variable BEMF, and variable losses. BLDC and PMSM motors have a cogging effect, and stable magnetic field of magnets doing eddy currents when free spinning. In alternator i can turn off power to magnet winding and there are only bearing losses so vehicle will slow down very long => very low losses. So I thing acceleration will be bad to compare with PMSM - I tested with my second remaked alternator on tricycle motor can handle 3kg weight on 110mm diameter with 23W consuption with magnet rotor, i tested same load with same diameter wheel, and i must put almost 200W to magnet coil, and about 5W to stator coil - i dont have a controller yet so its only approximate test.
But at cruising speed i thing its better to have a variable magnetic field, so losses can be smaller. And Variable BEMF / RPMS are also better, you dont need shifting gears, at standstill you can send 200W to magnet coil, and with speed decreasing that magnet coil power which will decrease losses in iron. BEMF is sine shaped. So what do you thing ? its better to modify it and not have any wasted energy in magnetic field or leave it as its and try it in real conditions? I think this water cooled alternator can handle 20kW of power like nothing
But at cruising speed i thing its better to have a variable magnetic field, so losses can be smaller. And Variable BEMF / RPMS are also better, you dont need shifting gears, at standstill you can send 200W to magnet coil, and with speed decreasing that magnet coil power which will decrease losses in iron. BEMF is sine shaped. So what do you thing ? its better to modify it and not have any wasted energy in magnetic field or leave it as its and try it in real conditions? I think this water cooled alternator can handle 20kW of power like nothing
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