Product Details

FANUC A06B-0062-B503 is βiS B4/4000 AC servo motor with keyway shaft and built-in 24V holding brake, belonging to FANUC high-response Beta iS servo family, compatible with βiS servo amplifiers and FANUC 0i-MF, 0i-MF Plus CNC systems. Comparing with the no-brake A06B-0062-B203 base model, this B503 variant adds integrated power-off electromagnetic brake, which locks the shaft securely once servo power is cut and prevents vertical Z-axis dropping on vertical machining centers and tapping machines. It adopts 200V three-phase AC power supply, rated speed 4000rpm, low inertia rotor design for fast acceleration and deceleration, fitted with B128iA absolute encoder to retain axis position data and skip repeated homing after power restart. The keyway shaft is designed for timing belt and pulley transmission to realize stable torque transfer and avoid slipping under cyclic load.

This servo motor integrates stator winding, low-inertia rotor assembly, B128iA absolute encoder and spring-type static holding brake 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. The built-in brake is power-release structure, intended only for static shaft holding instead of dynamic braking during high-speed movement. 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 reciprocating movement. Low inertia rotor delivers excellent response for tapping cycles and high-speed milling, shortening machining cycle time. Users can adjust servo gain, soft limit and brake delay parameters on CNC system to match gravity balance of vertical axes and elastic characteristics of belt transmission.

It serves as a direct replacement spare part for original keyway shaft βiS B4/4000 servo motors suffering from bearing abnormal noise, encoder signal loss, brake slip, shaft wear 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 high-speed regulation and reliable static locking performance. Replacing this servo motor can restore fast heavy-load feed axis motion rapidly, avoid machine shutdown caused by positioning deviation or vertical axis sliding. It is widely deployed in vertical machining centers, multi-axis tapping machines, mold engraving equipment and other belt-driven CNC feed axis applications.