12 V DC motor with following features
A) Maximum speed 3000 rpm
B) Motor diameter smaller the better
C) Motor height maximum 25-35 mm
D) Motor shaft diameter 7 mm 25 mm useable shaft length mounted on ball bearings
E) PWM electronic speed controller with battery drain protection operated by rechargeable 12 V lead acid battery.
F) Speed control required 0 -100%

Speed controller can be separate from the motor.