Product Details

FANUC A06B-0063-B203 is βiS B6/4000 AC servo motor with straight shaft and without 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. Compared with βiS B4/4000 version we listed before, this B6 model provides larger continuous torque and heavier load capacity while keeping 4000rpm high rated speed and low inertia rotor for rapid acceleration and deceleration. It adopts 200V three-phase AC power supply, fitted with B128iA absolute encoder, which can store axis position data and skip repeated homing after power restart. It is mainly used for horizontal X and Y feed axes of high-speed machining centers and precision milling equipment.

This servo motor integrates stator winding, low-inertia rotor assembly and B128iA absolute encoder 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. 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 variant cannot lock the shaft when power cuts off; external mechanical brake is required if deployed on vertical Z-axis. 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, resisting coolant splashes, cutting oil mist and fine metal dust in metal cutting workshops. The internal bearing assembly uses long-life grease lubrication to sustain continuous high-speed cyclic movement. The low inertia rotor ensures excellent dynamic response for high-speed milling cycles and fast reciprocating feed movement. Users can adjust servo gain and soft limit parameters on CNC system to match high-speed heavy-load feed motion characteristics.

It serves as a direct replacement spare part for original straight shaft βiS B6/4000 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 servo motor can restore fast heavy-load feed axis motion rapidly, avoid machine shutdown caused by machining interruption and positioning deviation. It is widely deployed in high-speed vertical machining centers, mold milling machines, multi-axis tapping machines and other precision CNC feed axis applications.