Product Details

FANUC A06B-0076-B203 is βiS B12/3000 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. Compared with βiS B8/3000 model, this B12 version delivers higher continuous torque for heavier cutting workload while keeping 3000rpm rated speed for stable medium-speed operation. It adopts 200V three-phase AC power supply, fitted with B128iA absolute encoder that retains position data after power failure and eliminates homing routine. The keyway shaft is engineered for timing belt and pulley transmission, maintaining steady torque output and preventing slippage under heavy cyclic cutting load. It is widely used for horizontal X and Y feed axes of heavy-duty vertical machining centers and large mold milling machines.

This servo motor integrates stator winding, moderate inertia rotor assembly and B128iA absolute encoder inside red-capped aluminum housing. The B128iA absolute encoder transmits high-precision angle feedback to servo amplifier, supporting closed-loop position, speed and torque control. It comes with keyway shaft matched with synchronous pulley and gear coupling for belt-driven mechanical layout. 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 separate connectors are arranged 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 sustain continuous medium-speed reciprocating cutting cycles. Its moderate rotor inertia balances high torque capacity and stable dynamic response, delivering smooth feed movement for heavy mold roughing and finishing. Users can adjust servo gain and soft limit parameters on CNC system to match 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 B12/3000 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 heavy-load medium-speed feed axis motion rapidly, avoid machine shutdown caused by cutting interruption and positioning deviation. It is widely deployed in heavy vertical milling centers, large mold processing equipment and other belt-driven CNC feed axis applications.