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My recent experience using a car alternator as a motor shows that they’re very inefficient, particularly above 24-36v, or around the 2400-3600rpm range. Extremely inefficient. You’ll be throwing away nearly half of your electric power(range) because of it. You’re also limited to 750 watts, realistically.
The up side is the cheapness of the “motor”.
An electric bike controller or other 3-phase, sensorless controller is required. You can get them up to about 1500 watts for under $50.
If you want real power - not electric bike power - you’ll need a real motor.
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