Product Details

FANUC A06B-0061-B203 is βiS B2/4000 AC servo motor with straight shaft, no built-in 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. Different from the low-speed B6 series we listed previously, this iS variant is designed for high-speed small feed axes, with 4000rpm rated speed and low rotor inertia, ideal for high-speed tapping and small milling equipment requiring fast axis reciprocating motion. It adopts 200V three-phase AC power supply, rated power 0.5kW, continuous torque 2Nm, equipped with high-resolution absolute encoder, which can retain axis position data and avoid repeated homing after power restart.

This servo motor integrates stator winding, low-inertia rotor assembly and absolute encoder inside compact red-capped aluminum housing. The absolute encoder feeds back precise angle signal to servo amplifier, supporting high-bandwidth closed-loop position, speed and torque control. It adopts smooth straight shaft structure, matched with rigid coupling for direct connection to ball screw, reducing transmission backlash and improving positioning repeatability. Since there is no built-in brake, this model is generally used for horizontal X and Y axes, and cannot be used alone for vertical Z-axis without adding external mechanical brake. Two independent locking connectors are arranged at the rear end, separately for power cable and encoder cable, following standard FANUC 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 metal cutting workshops. The internal bearing assembly adopts long-life grease lubrication, stable under frequent high-speed reciprocating movement. The optimized low-inertia rotor greatly improves acceleration and deceleration response, which is the core advantage for tapping cycles requiring rapid forward and reverse movement. Users can adjust servo gain and soft limit parameters on CNC system to match high-speed feed motion characteristics of small machining centers.

It serves as a direct replacement spare part for original βiS B2/4000 servo motors suffering from bearing abnormal noise, encoder signal loss, shaft runout and winding burnout. Every unit will pass winding insulation test, encoder position reading test and servo amplifier matching test before shipment, ensuring stable high-speed regulation and precise positioning performance. Replacing this high-speed servo motor can quickly restore fast feed axis motion, avoid machine shutdown caused by tapping and milling cycle interruption. It is widely deployed in CNC tapping machines, small high-speed milling machines, automatic engraving equipment and other high-speed precision CNC feed axis applications.