Fanuc A06B-0243-B100 AC Servo Motor
αiF 12/3000, Straight Shaft, A1000 Absolute, No Brake
Product Overview
Part Number: A06B-0243-B100
Also Searched As: A06B0243B100, FANUC A06B-0243-B100, Fanuc A06B0243B100
Motor Model: αiF 12/3000
Classification: Fanuc Alpha iF Series AC Brushless Servo Motor -- 12 Nm Stall Torque, 3.0 kW, 3,000 rpm, Straight Smooth Shaft, No Brake, Alpha i A1000 Absolute Pulse Coder, IP65
Technical Specifications
| Part Number | A06B-0243-B100 |
| Motor Model | αiF 12/3000 |
| Net Weight | 42.6 lbs (~19.3 kg) |
| Stall Torque | 12 Nm |
| Rated Output | 3.0 kW |
| Maximum Speed | 3,000 rpm |
| Input Voltage | 200-240V AC |
| Frequency | 50/60 Hz |
| Phases | 3-phase |
| Rated Current | 14 A |
| Pulse Coder | Alpha i A1000 (serial absolute) |
| Encoder Resolution | 1,000,000 pulses/rev |
| Shaft Type | Straight smooth (SLK -- no keyway) |
| Electromagnetic Brake | None |
| Protection Rating | IP65 |
| Insulation Class | Class F |
| Operating Temperature | 0°C to +40°C |
| Compatible Amplifiers | Fanuc αi series servo amplifiers (αiSV) |
| Compatible Controls | Fanuc Series 0i, 15i, 16i, 18i, 21i, 30i, 31i, 32i |
| Origin | Japan |
Twelve Newton-Metres – The Right Motor for Mid-Range Machine Tool Axes
The A06B-0243-B100 occupies the productive mid-tier in the αiF motor family. With 12 Nm of continuous stall torque and 3.0 kW rated output, it's perfectly suited for small to medium CNC machine tools where axis loads fall comfortably within the 12 Nm sustained torque budget.
The 3,000 rpm ceiling enables rapid traverse speeds appropriate for this machine category, while the 14A rated current fits standard three-phase electrical infrastructure. At 42.6 lbs (19.3 kg), proper lifting support is recommended during installation and maintenance.
Straight Smooth Shaft – Coupling Without Keyway
The straight smooth shaft (SLK) transmits torque exclusively through friction clamping force. This design requires properly specified split-hub clamp couplings or hydraulic expansion hubs to handle the 12 Nm stall torque and peak acceleration demands.
This configuration offers straightforward hub removal using standard gear pullers, providing maintenance advantages in constrained machine environments. For applications requiring keyed engagement, the A06B-0243-B200 variant with keyway is available.
No Brake – Standard Configuration for Horizontal Axes
The B100 designation indicates no electromagnetic brake, which is standard for horizontal CNC feed axes. Position at rest is maintained by the αi servo amplifier's servo lock functionality, where the position loop remains active and the encoder provides continuous feedback.
This configuration eliminates the need for brake circuits, relays, and timing logic, reducing panel complexity and component count. Braked variants (B300 and B400) are reserved for vertical axes where gravity requires additional holding security.
A1000 Absolute Encoder – Position Retention Through Power Cycles
The Alpha i A1000 serial absolute pulse coder with 1,000,000 pulses per revolution maintains multi-turn position through power-off events via the backup battery in the Fanuc αi servo amplifier.
This eliminates daily homing cycles, allowing immediate coordinate availability at startup and enabling seamless recovery from mid-program stops. The high resolution supports exceptional dimensional accuracy and surface finish quality.
Battery Maintenance: The A1000 backup battery resides in the αiSV servo amplifier. Replace it when the Fanuc CNC issues a low battery alarm to prevent multi-turn counter reset and forced axis re-referencing.
A06B-0243 Series Configuration Reference
| Part Number | Shaft | Keyway | Brake | Sealing |
| A06B-0243-B000 | Taper | Yes | None | IP65 |
| A06B-0243-B100 | Straight smooth | No | None | IP65 |
| A06B-0243-B100#0100 | Straight smooth | No | None | IP67 |
| A06B-0243-B200 | Straight | Yes | None | IP65 |
| A06B-0243-B300 | Taper | Yes | 24V spring | IP65 |
| A06B-0243-B400 | Straight smooth | No | 24V spring | IP65 |
| A06B-0243-B101 | Straight smooth | No | None | IP65 (i1000 encoder) |
Amplifier and CNC Compatibility
The A06B-0243-B100 operates with Fanuc αi series servo amplifiers (αiSV) – specifically αiSV 40 or αiSV 80 modules. Compatible CNC platforms include Fanuc Series 0i-D, 0i-F, 15i, 16i, 18i, 21i, 30i-A, 30i-B, 31i-A, 31i-B, and 32i.
When installing replacement motors, verify CNC axis parameters match the αiF 12/3000 motor type specification to prevent unstable axis behavior or amplifier faults.
Typical Applications
- Medium CNC vertical machining centre feed axes – X, Y, and Z drives on compact and mid-format VMCs
- CNC turning centre carriage and cross-slide drives – Z-axis carriage and X-axis cross-slide drives
- Drill-tap and compact machining centre primary axes – High-cycle production machines with short, fast moves
- Multi-axis machining centre secondary drives – B-axis rotary drives and rotary table positioning axes
Frequently Asked Questions
What is the difference between the B100 (straight smooth shaft) and the B000 (taper shaft)?
The B000 has a taper shaft with keyway for self-centering coupling, while the B100 has a straight smooth shaft for friction-clamped hub engagement. Motor performance is identical – selection depends on the existing coupling hub on your machine.
Does the A06B-0243-B100 need a homing cycle every time the CNC powers up?
No. The Alpha i A1000 absolute encoder retains multi-turn position through power-off via the backup battery. Axis coordinates are immediately available without homing movement after installation and one-time position synchronization.
Which Fanuc amplifier module is required for the A06B-0243-B100?
The motor requires a Fanuc αi series servo amplifier (αiSV) – specifically αiSV 40 or αiSV 80 modules for the 3.0 kW / 14A rating. Compatible with Fanuc Series 0i-D, 0i-F, 16i, 18i, 21i, 30i, and 31i controls.
Why is the motor weight (42.6 lbs) relevant to maintenance planning?
At over 19 kg, the motor requires two-person handling or proper lifting support during installation and removal, especially in restricted machine enclosures. Solo handling risks damage or injury.
When should the IP67 sealed variant (#0100) be specified instead of the standard B100?
Specify IP67 when the motor is mounted where coolant can pool around or directly contact the motor body. For protected, well-drained locations away from direct coolant exposure, standard IP65 is adequate.
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