Fanuc A06B-0253-B400 AC Servo Motor
αiF 30/4000, Straight Shaft, 24V Brake, A1000 Absolute
Product Overview
Part Number: A06B-0253-B400
Also Searched As: A06B0253B400, FANUC A06B-0253-B400, Fanuc A06B0253B400
Motor Model: αiF 30/4000
Classification: Fanuc Alpha iF Series AC Brushless Servo Motor -- 30 Nm Stall Torque, 4,000 rpm Maximum Speed, Straight Smooth Shaft, 24V Spring-Applied Brake, Alpha i A1000 Absolute Pulse Coder, IP65
Technical Specifications
| Parameter |
Value |
| Part Number |
A06B-0253-B400 |
| Motor Model |
αiF 30/4000 |
| Stall Torque |
30 Nm |
| Peak Torque |
40 Nm |
| Maximum Speed |
4,000 rpm |
| Phases |
3-phase |
| Pulse Coder |
Alpha i A1000 (serial absolute) |
| Encoder Resolution |
1,000,000 pulses/rev |
| Shaft Type |
Straight smooth (SLK -- no keyway) |
| Electromagnetic Brake |
24V spring-applied |
| Sealing |
IP65 (standard) |
| 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 |
| Shipping |
Freight required (large frame) |
| Origin |
Japan |
30 Nm Stall Torque – Built for Heavy-Axis Duty
The A06B-0253-B400 delivers 30 Newton-metres of continuous stall torque and 40 Nm peak torque during acceleration, positioning it at the high end of the αiF range. This motor is engineered for heavy primary feed axes on large-format CNC machine tools where sustained torque under cutting load is essential.
With 30 Nm stall torque, this motor can sustain over 10 kN of continuous axial thrust on a 16mm pitch ball screw, making it ideal for saddle drives on large horizontal machining centers, table drives on heavy vertical machining centers, or cross-slide axes on large CNC turning centers handling meter-diameter forgings.
24V Spring-Applied Brake: Engineered Safety
The B400 suffix confirms a 24V spring-applied electromagnetic brake that operates on fail-safe principles. When power is applied, the brake releases; when power is removed, the spring engages immediately without any control signal required.
On vertical axis applications, this brake prevents gravitational movement of heavy assemblies during shutdown, E-stop events, or power interruptions, protecting workpieces and tooling from falling axis damage.
Straight Smooth Shaft: High-Torque Coupling
The straight smooth shaft (SLK – no keyway) transmits torque entirely through friction between the hub bore and shaft outer diameter. At 40 Nm peak torque, proper coupling specification and installation are critical to prevent slipping under full acceleration.
A1000 Absolute Encoder: Position Retention
Featuring the Alpha i A1000 serial absolute pulse coder with 1,000,000 pulses per revolution, this motor maintains multi-turn position through power-off via backup battery. This eliminates the need for homing cycles after every power-up and provides immediate position verification for safe machine recovery.
Shipping Note
The A06B-0253-B400 is a large-frame servo motor requiring freight carrier shipping. Plan for freight transit time and confirm delivery requirements such as liftgate service or scheduled delivery appointments.
A06B-0253 Series Configuration Reference
| Part Number |
Shaft |
Keyway |
Brake |
Encoder |
Sealing |
| A06B-0253-B000 |
Taper |
Yes |
None |
A1000 absolute |
IP65 |
| A06B-0253-B100 |
Straight |
Yes |
None |
A1000 absolute |
IP65 |
| A06B-0253-B400 |
Straight smooth |
No |
24V spring |
A1000 absolute |
IP65 |
| A06B-0253-B400#0100 |
Straight smooth |
No |
24V spring |
A1000 absolute |
IP67 |
| A06B-0253-B300 |
Taper |
Yes |
24V spring |
A1000 absolute |
IP65 |
Typical Applications
- Primary table and saddle drives on large horizontal machining centers
- Vertical axis drives on large VMCs and gantry machines
- Heavy turning center carriage and cross-slide drives
- Large-format 5-axis machining center primary feeds
Frequently Asked Questions
Why is a 24V brake essential on this motor for vertical axis applications?
Servo lock requires active amplifier power to hold position. The 24V spring-applied brake provides mechanical holding independent of amplifier power, automatically engaging when power is removed to prevent gravitational movement of heavy axes.
What is the difference between IP65 and IP67 variants?
The standard B400 has IP65 sealing (dust and water jet protection). The B400#0100 variant upgrades to IP67 (temporary immersion protection up to 1 meter depth) for high-coolant-exposure environments.
Does this motor require homing after every power-up?
No. The Alpha i A1000 absolute encoder retains multi-turn position through power-off via backup battery, eliminating the need for reference-return traverses after normal power cycles.
What amplifier does this motor pair with?
The A06B-0253-B400 requires a Fanuc αi series servo amplifier (αiSV) with matching current rating. Compatible CNCs include Fanuc Series 0i-D/F, 16i, 18i, 21i, 30i, and 31i.
Can the smooth shaft be substituted with a keyed shaft version?
No. The shaft configuration must match the existing coupling hardware. For keyed couplings, use A06B-0253-B100 (straight keyed, no brake) or A06B-0253-B300 (taper keyed, with brake).
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