Product Details

FANUC A06B-0064-B203 is βiS B8/4000 AC servo motor with straight shaft and 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. Compared with βiS B6/4000 model we listed before, this B8 version delivers higher continuous torque and heavier load capacity, maintains 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 saves axis position data and avoids repeated homing after power restart. It is commonly matched with rigid coupling and ball screw for high-precision horizontal X, Y feed axes of heavy-duty high-speed machining centers.

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 position signal to servo amplifier, supporting high-bandwidth closed-loop position, speed and torque control for CNC feed axes. It adopts smooth straight shaft design, which minimizes transmission backlash and improves positioning repeatability. Without built-in brake, this variant cannot lock the shaft during power loss; external mechanical brake must be equipped 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 adopts long-life grease lubrication to sustain continuous high-speed reciprocating cutting cycles. The low inertia rotor provides outstanding dynamic response, shortening cycle time for high-speed milling and thread tapping. Users can adjust servo gain and soft limit parameters on CNC system to match heavy-load high-speed feed motion characteristics.

It serves as a direct replacement spare part for original straight shaft βiS B8/4000 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 heavy-load fast feed axis motion rapidly, avoid machine shutdown caused by machining interruption and positioning deviation. It is widely deployed in high-speed vertical machining centers, heavy mold milling machines, multi-axis tapping equipment and other precision CNC feed axis applications.