Fanuc A06B-0202-B000 AC Servo Motor — αiF 1/5000, Taper Shaft, Absolute A1000, Good Condition

Product Overview

Part Number: A06B-0202-B000

Also Searched As: A06B0202B000, FANUC A06B-0202-B000, Fanuc A06B0202B000

Motor Model: αiF 1/5000

Condition: Good — used, inspected, operationally verified

Classification: Fanuc Alpha iF Series AC Brushless Servo Motor — 1 Nm Stall Torque, 5,000 rpm Max Speed, Taper Shaft with Key, No Brake, Alpha i A1000 Absolute Pulse Coder, IP65

About This Unit

The A06B-0202-B000 listed here is in good condition — a used motor that has been inspected and confirmed serviceable. For facilities running Fanuc-controlled equipment that needs a working replacement now rather than waiting on new stock lead times, a good-condition unit at a realistic price point is often the right practical answer.

Good condition means the motor has been physically inspected for shaft integrity, seal condition, and encoder housing damage. It operates correctly. It is not a new motor, and it is not represented as one. What it is — a properly functioning αiF 1/5000 ready to go back on machine — is exactly what a maintenance team pulling a failed motor off an axis needs.

Technical Specifications

The αiF 1/5000 — Compact, Fast, Precisely Positioned

Some axes simply do not require large stall torques. Tool magazine indexing mechanisms, compact ATC arm drives, small rotary positioning tables, and secondary positioning axes on multi-axis machining centres are built around light loads that move quickly and stop precisely. For these applications, a motor with 10 or 15 Nm of stall torque is overkill — what the design actually needs is a motor that fits the mechanical envelope, reaches speed rapidly, and delivers repeatable positioning accuracy in a small, light package.

That is the αiF 1/5000.

One Newton-metre of stall torque matches the sustained load demands of lightweight CNC auxiliary axes. Five thousand rpm maximum speed makes this one of the faster motors in the αiF family — on a 5mm pitch ball screw in direct coupling, 4,000 rated rpm produces 20 m/min of traverse. For a compact axis with limited load mass, that combination of modest torque and high speed gives genuine axis performance without the bulk of a larger motor.

0.5 kW at 95% power factor means the motor draws less reactive current than competing designs of similar output. On machines with multiple servo axes drawing from a common supply, the compounded effect of high power-factor motors contributes meaningfully to supply loading and panel thermal management.

Good Condition — The Honest Assessment

The word "good" carries specific meaning here. This is not surplus-warehouse stock that sat untouched for a decade. It is a used motor in serviceable condition — one that has been checked by personnel who understand what to look for on an αiF series motor before it goes back into service.

What good condition covers on this motor:

Shaft geometry — the taper shaft has been inspected. A taper shaft that has been repeatedly removed and reinstalled with improper tooling, or that has suffered physical impact, can lose dimensional integrity and make reliable coupling engagement impossible. This unit's taper is intact.

Encoder housing and connector — the A1000 pulse coder housing is undamaged and the connector body is clean with no bent or corroded pins. The encoder is the most expensive serviceable component on this motor; one with a damaged connector is worth significantly less than one with the connector in clean condition.

IP65 sealing — the motor body shows no evidence of seal failure or coolant ingress. At IP65, the motor is protected against dust and directed water; seals that have degraded allow coolant to reach the windings and end up producing insulation failures.

Rotation and bearing condition — the motor turns freely with no roughness or dragging that would indicate a bearing in need of replacement.

This is a practical, honest inventory description. The motor is used. Buyers who need absolute certainty of zero accumulated hours and factory-calibrated encoder alignment should specify a new unit. Buyers who need a working αiF 1/5000 on a short timeline at a competitive price — this is it.

Taper Shaft and Key: Secure Coupling for Precision Axes

Every A06B-0202-B000 carries a precision-ground taper shaft with key. This coupling standard is the machine tool industry norm for good reasons — the taper geometry self-centres the coupling hub during installation, and the key transmits torque through positive mechanical engagement rather than friction clamping alone.

At 1 Nm stall torque, the key is transmitting a modest load relative to the shaft geometry. The practical benefit of the taper-plus-key configuration at this torque level is coupling repeatability: when the motor is removed and reinstalled — during servicing, bearing replacement, or encoder swap — the coupling hub reseats in the same geometry every time. The axis coupling position is repeatable, which means axis calibration and following error checks after a motor swap are straightforward.

For machines where the driven coupling requires a smooth bore without keyway engagement, the A06B-0202-B100 variant within the same αiF 1/5000 family carries a straight smooth shaft. The torque, speed, encoder, and all other specifications are identical — only the shaft geometry differs.

No Brake: Right for the Majority of Applications

The B000 suffix means no electromagnetic brake. This is the standard baseline configuration for horizontal auxiliary axes and the majority of positioning axes where no net gravitational force acts along the shaft rotation direction.

On these axes, position at rest is maintained by the Fanuc αi servo amplifier's servo lock. With the A1000 reporting 1,000,000 counts per revolution, the amplifier continuously corrects to the commanded shaft angle — reliable, accurate, and requiring no additional 24V brake circuit, brake relay, or brake timing in the CNC startup sequence.

Vertical axes or inclined feeds that carry a gravitational load along the direction of shaft motion are a different matter. On those axes, servo lock alone is not safe at servo-off, and the motor specification must include a brake. The brake variant for this motor is the A06B-0202-B300 (taper shaft, 24V spring-applied brake, A1000 absolute). Before fitting a B000 replacement, confirm the axis orientation and load characteristics are consistent with a brakeless motor.

Alpha i A1000 Absolute Pulse Coder: No Homing Required

The A06B-0202-B000 carries the Alpha i A1000 serial absolute pulse coder — 1,000,000 pulses per revolution, with multi-turn absolute position retained through power-off by the backup battery in the Fanuc αi servo amplifier.

The operational consequence is straightforward and significant: power up the CNC, the axis coordinate is known immediately. No reference-return cycle. No supervised homing traverse. No waiting for the axis to find its reference marker before production can start. For machines that cycle power between shifts, restart after an alarm, or recover from a power interruption, the absolute encoder means the machine resumes where it stopped — which is particularly valuable on multi-axis machines where homing all axes sequentially takes meaningful time.

On a used motor like this A06B-0202-B000, the A1000 multi-turn counter is retained by the battery in the amplifier, not in the motor itself. When a replacement motor is installed, the CNC's current position data may need to be re-referenced once to synchronise the absolute counter to the machine coordinate system — a standard commissioning step that the machine's service documentation covers. After that initial synchronisation, the absolute position retention operates normally.

Battery maintenance reminder: the backup battery is in the servo amplifier, not in the motor. Replace it when the Fanuc CNC issues a low battery alarm — a depleted battery resets the multi-turn counter and forces a re-homing operation.

A06B-0202 Series Variants at a Glance

The B000 is the no-brake, taper-shaft, absolute encoder baseline — the cleanest and most common configuration in this motor family. Match the exact suffix to the motor being replaced; encoder type and brake configuration are not interchangeable between variants on the same machine without parameter changes and wiring modifications.

Typical Applications

Tool magazine and ATC mechanism drives. Random-access tool magazine indexing, ATC arm positioning, and tool chain drive mechanisms on Fanuc-controlled machining centres where the light mechanism load fits within the 1 Nm torque budget and the 5,000 rpm maximum speed allows fast magazine cycle times.

Compact CNC machining centre feed axes. X, Y, and Z drives on small drill-tap centres, desktop CNC machining centres, and compact 3-axis machines where the load mass and cutting force demands align with the αiF 1/5000's capability envelope.

Rotary and indexing positioning axes. Rotary table drives, B-axis tilting mechanisms, and auxiliary indexing axes on multi-axis machining centres and turn-mill centres where precise angular positioning at speed is the primary requirement.

Secondary and subsidiary axes on multi-axis systems. U, V, W, and other subsidiary linear axes, as well as gang-slide positioning drives on multi-spindle turning centres, where the axis load is secondary and the αiF 1/5000's compact size is a packaging advantage.

Fanuc robot peripheral axis drives. Seventh-axis traversal units, positioner subsidiary axes, and peripheral drive mechanisms in Fanuc robot cells where the αiF 1/5000's αi compatibility allows integration into the same servo network as the primary robot axes.

FAQ

Q1: What does "good condition" mean for this motor — has it been tested?

Good condition means the motor has been physically inspected and confirmed serviceable. The shaft, encoder housing, sealing, and bearing feel have all been checked. It is a used motor — not new, not rebuilt to new specification — but it is one that has passed inspection and is ready to return to service. For buyers who require new-from-factory condition with zero accumulated hours, a new unit is the appropriate choice. For facilities that need a functioning αiF 1/5000 quickly at a competitive price, this motor is the practical option.

Q2: Does this motor require a homing cycle after every CNC power-up?

No. The Alpha i A1000 is a serial absolute encoder. Multi-turn shaft position is retained through power-off by the backup battery in the Fanuc αi servo amplifier. When the CNC powers up, the axis coordinate is re-established immediately without any axis movement. This is one of the key advantages of the absolute encoder over the incremental i1000 variant (B001), which requires a reference-return on every power-up. Note that after installing a replacement motor, a one-time position synchronisation is typically required to match the absolute counter to the machine coordinate — this is a standard commissioning step, not a recurring homing requirement.

Q3: Which Fanuc amplifier pairs with the A06B-0202-B000?

This motor requires a Fanuc αi series servo amplifier (αiSV). At 0.5 kW / 1 Nm, the αiSV 4 covers the power level. Compatible CNC platforms include Fanuc Series 0i-D, 0i-F, 16i, 18i, 21i, 30i, 31i, and 32i. The A06B-0202-B000 is not compatible with original α series (non-i) amplifiers or Fanuc β series drives. When replacing a failed motor, verify the amplifier's axis parameter settings match the αiF 1/5000 motor type before running production.

Q4: Can a B000 (no brake) replace a B300 (brake version) in a machine?

Not without a full assessment of the axis. The B300 brake variant is fitted on axes where mechanical holding is required at servo-off — typically vertical or inclined axes where gravity would cause movement without the brake. Replacing a B300 with a B000 removes that safety function. Servo lock alone is not adequate on such axes when the amplifier is de-energised. If the failed motor is confirmed to have been a B000 originally, this replacement is straightforward. If the original motor was a B300, consult the machine documentation or builder before fitting a brakeless replacement.

Q5: Is the αiF 1/5000 the smallest motor in the Fanuc αiF series?

Yes, the αiF 1/5000 is the entry-level model of the Fanuc αiF series by stall torque. The αiF family steps up through αiF 2/5000 (2 Nm), αiF 4/5000 (4 Nm), αiF 8/3000, and larger models. All share the same αi serial encoder interface and amplifier platform. If the machine axis demands more than 1 Nm of sustained stall torque, the next step up is the αiF 2/5000 (A06B-0205 series). If the existing axis was originally fitted with a 1 Nm motor, replacing it with a larger motor requires verifying that the amplifier current rating and axis parameter settings are compatible with the new motor — not simply a mechanical swap.