Product Details

FANUC A06B-0061-B503 is βiS B2/4000 AC servo motor with keyway shaft and 24VDC holding brake, belonging to FANUC high-response Beta iS servo series, compatible with βiS servo amplifiers and FANUC 0i-MF, 0i-MF Plus CNC systems. It is upgraded on the basis of A06B-0061-B203#0100 no-brake version, the built-in power-off electromagnetic brake can lock the shaft position when servo power is cut off, preventing vertical Z-axis sliding on vertical machining centers and tapping machines. It adopts 200V three-phase AC power supply, rated power 0.5kW, rated speed 4000rpm, low inertia rotor design for fast acceleration and deceleration, equipped with B128iA absolute encoder, which retains axis position data and eliminates repeated homing after power restart.

This servo motor integrates stator winding, low-inertia rotor assembly, B128iA absolute encoder and spring static holding brake inside compact aluminum housing. The B128iA absolute encoder feeds back high-precision angle signal to servo amplifier, supporting high-bandwidth closed-loop position, speed and torque control for CNC feed axes. The built-in brake is power-release type, only suitable for static shaft holding and not for dynamic braking during high-speed movement. The keyway shaft structure is matched with timing pulley and gear coupling, which can transfer torque steadily and avoid slipping under frequent fast reciprocating motion. Two independent locking connectors are arranged at the rear end, separately for power cable and encoder cable, following FANUC standard pin definition for convenient wiring and maintenance.

The front shaft sealing structure reaches IP67 protection grade, with better dust and splash resistance, resisting coolant splashes, cutting oil mist and fine metal dust in tapping and engraving workshops. The internal bearing assembly uses long-life grease lubrication to sustain continuous high-speed cyclic movement. The low inertia rotor is the core advantage for tapping cycles, shortening cycle time and improving thread machining consistency. Users can adjust servo gain, soft limit and brake delay parameters on CNC system to match the gravity balance of vertical axes and the elastic characteristics of belt transmission.

It serves as a direct replacement spare part for original keyway shaft βiS B2/4000 servo motors suffering from bearing abnormal noise, encoder signal loss, brake slip, shaft wear and winding burnout. Every unit will pass winding insulation test, encoder position reading test, brake holding force verification and servo amplifier matching test before shipment, ensuring stable high-speed regulation and reliable static locking performance. Replacing this servo motor can restore fast feed axis motion rapidly, avoid machine shutdown caused by tapping and milling cycle interruption or vertical axis sliding. It is widely deployed in CNC tapping machines, high-speed engraving equipment, small milling machines and other belt-driven high-precision CNC feed axis applications.