Product Details

FANUC A06B-0121-B075 is βiS B4/4000 AC servo motor with keyway shaft and no built-in holding brake, belonging to FANUC Beta iS servo series, compatible with βiS servo amplifiers and FANUC 0i-MF, 0i-MF Plus CNC systems. It adopts 200V three-phase AC power supply, rated power 1.0kW, rated speed 4000rpm, stall torque 4.0Nm. This medium inertia servo motor delivers stable continuous torque output for medium and heavy load cutting tasks. The high-resolution serial encoder provides precise real-time position feedback for closed-loop motion control. The keyway shaft is designed for timing belt and pulley assembly, offering solid torque transmission and avoiding slippage during milling cycles. It is widely deployed on X/Y feed axes and rotary fourth axes of vertical machining centers and medium-sized CNC milling machines for routine milling, drilling and tapping operations.

This servo motor integrates stator winding, medium inertia rotor assembly and high-resolution serial encoder inside aluminum housing. The encoder transmits high-precision angle feedback signals to servo amplifier to realize closed-loop position, speed and torque control. It comes with keyway shaft matched with synchronous pulley for belt-driven mechanical layout. Without built-in brake, this unit cannot lock shaft position during power outage; external brake assembly must be installed if used on vertical Z-axis. Two separate connectors are reserved at the rear for power cable and encoder cable, following FANUC standard pin definition for convenient wiring and maintenance.

The front shaft sealing structure reaches IP65 protection grade, resisting coolant splashes, cutting oil mist and fine metal dust in CNC workshops. The internal bearing set uses long-life grease lubrication to support continuous medium-speed cyclic operation. Its moderate rotor inertia balances acceleration performance and cutting anti-interference, suitable for stable heavy-load cutting and repeated positioning. Users can adjust servo gain and soft limit parameters on CNC system to match medium-heavy-load medium-speed feed and the elastic property of belt transmission.

It serves as a direct replacement spare part for original keyway shaft βiS B4/4000 servo motors suffering from bearing abnormal noise, encoder signal loss, shaft wear and winding burnout. Every unit will pass winding insulation test, encoder position reading test and servo amplifier matching test before shipment, ensuring stable torque output and precise positioning performance. Replacing this servo motor can restore medium-heavy-load medium-speed feed axis motion rapidly, avoid machine shutdown caused by cutting interruption and positioning deviation. It is widely deployed in vertical machining centers, medium CNC milling equipment and other belt-driven CNC feed axis applications.