Quote:
Originally Posted by NISFAN
Perhaps because a starter motor spins the engine at aprox. 200rpm during cranking. Don't expect it will last long at 9000rpm, lol - - - Obviously a differential gearing system would need to be employed.
Years ago, cars used to use a device called a generator, which looked just like a starter motor. However the alternator became the chosen device because it was far superior in terms of output and efficiency.
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It's only turning slowly because it is designed for low speed high torque to crank the engine using battery power,- the bearings could be replaced with high speed ones I would think?.
The other point is that it is a DC motor like the dynamo (generator) in my old car which are basically the same thing,- spin them and they produce electric power, apply electric power and they spin. Alternators produce AC which has to be rectified to DC to keep the battery charged and run everything.