A06B-0114-B075 Fanuc AC Servo Motor A06B0114B075 AO6B-OII4-BO75

FANUC A06B-0114-B075 | BM0.4/4000 AC Servo Motor — BA64B Encoder, Straight Shaft / Keyway

Part Number: A06B-0114-B075

Manufacturer: FANUC Corporation (Japan)

Product Type: AC Brushless Servo Motor — BM Series

Motor Model: BM0.4/4000 

A Compact Motor for High-Speed Precision

The A06B-0114-B075 is FANUC's BM0.4/4000 — a compact, high-speed AC brushless servo motor from the BM series. At 4,000 rpm rated speed and 0.13 kW output, it is sized for light-duty servo axes on small CNC machine tools, coordinate measuring machines, and automation equipment where a compact motor with reliable encoder feedback is needed.

The BM series preceded FANUC's Alpha generation and was widely deployed across Series 0, 3, and 6 CNC systems. Machines built on these platforms remain in service at many facilities, and the A06B-0114-B075 continues to be sourced as a maintenance item for those installed bases.

The BA64B encoder is a built-in incremental encoder — 64 signal periods per revolution, processed by the CNC's servo interface to provide position and velocity feedback. On machines running FANUC Series 0 or 3 controls, the servo drive interprets this signal directly through the axis control card.

The straight shaft with machined keyway provides a positive torque drive to the coupled component. Unlike a friction-clamp coupling, a keyway arrangement does not require periodic re-torquing and will not slip under reversal or vibration loading over the motor's service life.

Key Specifications

FAQ

Q1: What FANUC CNC systems is the A06B-0114-B075 compatible with?

The BM series motors were designed for FANUC Series 0, 3, and 6 CNC systems using analogue or early serial servo interfaces. Confirm the servo drive and CNC generation match the BM motor's interface requirements — later Alpha-series servo amplifiers use different motor feedback protocols.

Q2: The BA64B encoder shows a feedback alarm on the CNC. Is the motor encoder the first thing to replace?

No. First inspect the encoder connector at both the motor and the servo drive for loose contacts, corrosion, or damaged pins. Then check the encoder cable for damage along its length. Cable and connector faults produce identical alarm conditions to a failed encoder. Only replace the encoder (or motor) after ruling out the cable and connector.

Q3: Is the keyway mandatory, or can a friction-clamp hub be used on the straight shaft?

A friction-clamp hub is mechanically compatible with a straight shaft. However, at 4,000 rpm with frequent reversals, a friction clamp must be correctly torqued at installation and periodically re-checked. A keyway provides a more positive drive path. If the driven component already has a keyway bore, use a key. If not, either configuration is acceptable as long as the clamp is correctly maintained.

Q4: The A06B-0114-B075 motor shaft has runout after a crash event. Can the shaft be repaired?

Shaft replacement on BM series motors is a specialist service offered by FANUC-qualified motor repair companies. If the stator windings and encoder are intact, shaft repair or replacement is usually more economical than sourcing a replacement motor — particularly for a discontinued part with limited surplus availability.

Q5: Where is the A06B-0114-B075 sourced?

FANUC BM series motors are available through the industrial CNC spare parts aftermarket — surplus from decommissioned machines and tested refurbished units from motor repair companies. Confirm the encoder and shaft condition are verified before accepting any used unit.