Fanuc Servo Motor A06B-0151-B576 A06B0151B576 A06B-0151-B576

FANUC A06B-0151-B576 | Alpha α30/1200 AC Servo Motor — 30 Nm / 3.3 kW / Taper Shaft / αA64 + Supercapacitor

Part Number: A06B-0151-B576

Manufacturer: FANUC Corporation (Japan)

Product Type: AC Brushless Servo Motor — Fanuc Alpha Series

 Maximum Speed: 1,200 rpm

Motor Voltage: 191V, 80 Hz, 3-phase (from servo amplifier) 

Compatible CNC: Series 0, 0C, 15, 16, 18, 21, 16i, 18i, 21i, 0i

30 Nm at 1200 rpm — Built for Heavy Axis Drives

The A06B-0151-B576 is FANUC's α30/1200: 30 Nm stall torque at 1,200 rpm maximum speed. The low speed ceiling is not a constraint — it is the design intent. This motor was engineered for sustained high-torque drives at moderate shaft velocity: B-axis rotary pallets, W-axis quill feeds, column Z-axis travels on large horizontal machining centres, radial feed axes on boring mills, and rotary table drives where the load mass demands 30 Nm and precision positioning at low speed is the priority over rapid traverse.

At 41 kg, this motor requires crane or hoist handling. FANUC's documentation is explicit — the motor lifting eyebolt is for the motor only, not for any connected assembly.

The 191V / 80Hz motor terminal specification is the servo amplifier's output to the motor under rated conditions. The machine connects to standard 200–230V AC three-phase mains at the amplifier input. Applying mains voltage directly to the motor terminals destroys the windings.

Key Specifications

A06B-0151 Variant Summary

The B576 is the combination for: positive taper-shaft coupling, absolute position without homing, and no brake — the standard specification for horizontal heavy-axis drives where servo lock is sufficient at rest.

FAQ

Q1: What is the difference between the B576 (αA64+S.C.) and the B577 (αI64)?

The B576 carries an absolute pulsecoder — it knows shaft position at power-up without a reference return. The B577 uses an incremental pulsecoder — it requires a reference return at every startup. These are not interchangeable without CNC and amplifier parameter changes. A machine originally commissioned with B576 that receives a B577 will require a supervised reference return before every production run.

Q2: The motor has been in storage for months. Will absolute position data be valid?

Not necessarily. The supercapacitor discharges over weeks without power. After extended storage, treat absolute position data as lost. Connect the motor to its amplifier, power up in idle state, allow the supercapacitor to recharge, then perform a full reference return to re-establish machine coordinates before resuming production.

Q3: What amplifier is required, and can the motor run on an Alpha i SVM?

The motor pairs with the SVM2-40/80: A06B-6079-H207 (original Alpha, standard bus) or A06B-6096-H207 (Alpha i, FSSB). The motor is electrically compatible with both generations. The critical factor is the CNC: Alpha i FSSB amplifiers require a FSSB-capable CNC (16i, 18i, 0i etc.), while original Alpha amplifiers suit older Type-A/B interface CNCs. Verify the CNC generation before selecting the amplifier.

Q4: Why does the motor nameplate show 191V rather than the 200-230V mains supply voltage?

The 191V / 80Hz is the servo amplifier's output to the motor at rated operating conditions — not the incoming mains supply. The amplifier rectifies 200–230V AC mains to a DC bus, then inverts to variable-frequency variable-voltage output matched to the motor's requirements. The motor must always be driven through a matched FANUC Alpha servo amplifier. Applying mains voltage directly to the motor terminals destroys the windings.

Q5: What are the priority checks on a used A06B-0151-B576?

Verify that 41 kg crane handling equipment is available before removal. Inspect the taper shaft surface for fretting or scoring. Rotate the shaft by hand for bearing smoothness. Check the encoder connector for pin integrity and sign of coolant ingress. After connection to its amplifier, verify the supercapacitor has recharged and absolute position data is valid before returning the axis to production. Measure three-phase winding resistance and insulation resistance to earth with the encoder cable disconnected.