This shows you a step by step on how to take an alternator apart and convert it into a brush less motor. This alternator is wired in a delta configuration.
used alternator
https://www.ebay.com/itm/224601902788...
new alternator
https://www.ebay.com/itm/362756133812...
12V 40A speed controller
https://rover.ebay.com/rover/1/71153...
36V/48V Speed Controller 350W
http://rover.ebay.com/rover/1/711532...
12V 40A speed controller
https://www.ebay.com/itm/274535173696...
36v Battery
https://www.ebay.com/itm/123932954313...