About this item Air Cooled Spindle-- Power: 500W; Idling Speed: 2000-12000r/min; Torque：0.5NM; Diameter: 52mm. Speed Controller-- Armature output voltage: DC0 ~ 100V adjustable; Input Voltage: AC100-AC220V±10% Global voltage 50/60Hz(User can change the power supply to 110V according to their needs); Current Limit: 6A; Wiring: Terminal type (Convenient and fast). Adopt pulse width technology to make the speed more stable, and the speed is high under low speed. With overcurrent protection cut-off device to make performance more reliable; With a soft start device to eliminate motor starting current is too large. Note: This motor has quiet operation, small volume and high speed, and the rear end of the motor is reinforced with a cooling fan, which can be safely worked for a long time!