A06B-1467-B123#0A21 Fanuc Servo Motor A06B1467B123#0A21 AO6B-I467-BI23#OA2I

FANUC A06B-1467-B123#0A21 | AiT Series AC Spindle Motor — 8,000 / 12,000 RPM, Flange Mount, Rear

Part Number: A06B-1467-B123#0A21

Cross Reference: A06B1467B123, A06B-1467-B123/0021

Manufacturer: FANUC Ltd. (Japan)

Product Type: AC Spindle Motor — AiT Series 

High-Speed CNC Spindle Power

The A06B-1467-B123#0A21 is an AiT series AC spindle motor from FANUC's A06B-1467 product line. "AiT" designates the Alpha i Turning series — FANUC's high-performance spindle motor family engineered for CNC turning centres, machining centres, and milling machines requiring high-speed, high-power spindle performance.

The 8/12,000 RPM speed specification defines this motor's operating range. At base speed (8,000 RPM), the motor delivers its rated torque under constant-torque control. Above 8,000 RPM, field weakening reduces flux to allow speeds up to 12,000 RPM under reduced-torque (constant-power) conditions. This two-range operating profile is standard for CNC spindle motors and matched to the cutting speed requirements of high-speed machining applications.

The flange mount and rear orientation specify the mechanical configuration: the motor is designed for flange mounting to the machine spindle head casting, with the cable exit and encoder connection at the rear. The #0A21 suffix encodes the encoder type, brake specification, and shaft configuration for this specific variant within the B123 motor frame.

AiT Series Compatibility

The A06B-1467-B123 series motors are designed for use with FANUC's Alpha i spindle amplifier modules — the A06B-6111 and A06B-6114 series. The amplifier and motor are matched through the spindle amplifier's motor selection parameters. Fitting the A06B-1467-B123#0A21 to the correct amplifier type is essential; mismatched amplifier-motor combinations cause overcurrent alarms or inadequate spindle performance.

Key Specifications

FAQ

Q1: The CNC shows spindle alarm AL-03 (overspeed) when commanding speeds above 8,000 RPM. Is the motor or the spindle amplifier the cause?

AL-03 above 8,000 RPM on this motor suggests the amplifier's speed range parameters may not be configured for the 12,000 RPM maximum. The spindle amplifier's maximum speed parameter must match the motor's rated maximum. If parameters are correctly set, check the spindle encoder feedback — an encoder fault produces erroneous speed readings that trigger AL-03.

Q2: What spindle amplifier is compatible with the A06B-1467-B123#0A21?

The A06B-1467-B123 series AiT motors are matched to FANUC Alpha i spindle amplifier modules in the A06B-6111 and A06B-6114 series. The specific amplifier model depends on the motor's power rating. Confirm the correct amplifier-motor combination from FANUC's spindle system configuration documentation before replacement.

Q3: The motor runs smoothly at low speed but vibrates at speeds above 6,000 RPM. Is this a motor fault or a balancing issue?

High-speed vibration on a spindle motor after service or installation is most commonly caused by insufficient dynamic balancing of the toolholder and cutting tool assembly — not the motor itself. Before suspecting the motor, verify the tool assembly is balanced for the operating speed. If the motor vibrates with no toolholder fitted, the motor's rotor balance may have been disturbed during transport or a previous repair.

Q4: The #0A21 suffix — how critical is it to match this exactly when sourcing a replacement?

The suffix defines encoder type, brake option, and shaft configuration. Fitting a motor with a different suffix may result in an encoder incompatibility (the CNC cannot correctly read position feedback), a missing or unexpected brake function, or a shaft diameter mismatch with the spindle coupling. Always match the complete part number including suffix.

Q5: Can the A06B-1467-B123#0A21 motor be rewound or refurbished rather than replaced if the winding has failed?

Yes. FANUC spindle motor rewinding is a specialist service offered by certified motor repair companies. A rewound motor with new windings, re-balanced rotor, and tested encoder is functionally equivalent to a replacement unit at a fraction of the cost of a new motor. Confirm the repair company has FANUC spindle motor experience and a dynamic load test rig before commissioning a rewind.