Product Details

FANUC A06B-0075-B403 is βiS B8/3000 AC servo motor with straight taper shaft and built-in 24V 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 the no-brake A06B-0075-B003 model, this variant adds integrated power-off electromagnetic brake to lock the shaft securely when power is cut off, preventing vertical Z-axis dropping on vertical machining centers and mold milling machines. It adopts 200V three-phase AC power supply, rated power 1.2kW, rated speed 3000rpm, stall torque 7Nm, equipped with B128iA absolute encoder, which retains position data after power outage and eliminates homing operation. The straight taper shaft is matched with rigid coupling for direct connection with ball screw to reduce backlash and improve positioning repeatability.

This servo motor integrates stator winding, moderate inertia rotor assembly, B128iA absolute encoder and spring static holding brake 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. The built-in brake is power-release type, only for static shaft holding instead of dynamic braking during high-speed movement. 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 torque capacity and dynamic response, delivering smooth feed movement for heavy mold cutting. Users can adjust servo gain, soft limit and brake delay parameters on CNC system to match vertical axis gravity balance and medium-speed heavy cutting feed characteristics.

It serves as a direct replacement spare part for original straight shaft βiS B8/3000 servo motors suffering from bearing abnormal noise, encoder signal loss, brake slip, shaft runout and winding burnout. Every unit will pass winding insulation test, encoder position reading test, brake holding force verification and servo amplifier matching test before shipment, ensuring stable torque output and reliable static locking performance. Replacing this servo motor can restore heavy-load medium-speed feed axis motion rapidly, avoid machine shutdown caused by cutting interruption and vertical axis sliding. It is widely deployed in vertical milling machines, mold processing centers, heavy tapping equipment and other CNC feed axis applications.