How to control a DC Brushless motor

[maquiza]

Hello, I have a 17.5V Lincoln laser Co. DC Brushless motor, 4 poles, with differential halls and BEI encoder. This motor rotates 8 small mirrors to make a line with a laser.( I want to make it work for David laser scanner tests)
Can someone tell me if I can use only the encoder for feedback or how to make it just spin.

Regards,

Jorge

[maquiza]

this is the picture

[Al_The_Man]

Not sure what you are looking to do, but if you just want to rotate the motor, you could use a A-M-C drive as a variable speed drive using a pot.
You will however need the commutation feedback, but do not need an encoder.
BTW if you were to hook up an identical motor, the 3 stator lead to each other, turning one shaft will rotate the other in the same degree (providing no great load is on the motor). servo action.
Al.