FANUC A06B-0235-B202 AC Servo Motor
Alpha iS 8/4000, 2.5kW, IP67 Keyed Shaft
Solid Torque, Proven in the Field
When CNC axes require reliable performance across thousands of production hours, motor selection becomes critical. The FANUC A06B-0235-B202 AC servo motor from the Alpha iS 8/4000 series represents one of the most widely deployed FANUC servo motors in small to medium-format machine tools worldwide.
Key specifications include: 2.5 kW rated output, 8 Nm stall torque, 4,000 RPM maximum speed, and 11 A stall current. This motor operates on 3-phase 184V at 267Hz with amplifier input of 200-230 VAC. The B202 variant features a straight shaft with keyway, carries an IP67 protection rating (water-resistant to 1 meter immersion), and includes the FANUC Alpha i A16000 pulse coder (A860-2001-T321) for high-resolution position feedback. No integrated brake is included in this configuration.
Technical Specifications
| Parameter |
Value |
| Model |
Alpha iS 8/4000 |
| Rated Output |
2.5 kW |
| Stall Torque |
8 Nm |
| Maximum Speed |
4,000 RPM |
| Stall Current |
11 A |
| Motor Voltage |
3-phase 184V / 267Hz |
| Amplifier Input |
200-230 VAC, 3-phase, 50/60Hz |
| Encoder |
Alpha i A16000 (A860-2001-T321) |
| Shaft Type |
Straight with keyway |
| Electromagnetic Brake |
Not included |
| Protection Rating |
IP67 |
| Winding |
3-phase Y-connected, 8-pole |
| Power Factor |
97% |
IP67 Protection - More Than Just a Rating
The B202's IP67 rating provides superior protection compared to the IP65 rating found on other A06B-0235 variants. While IP65 handles coolant splash and directed water jets, IP67 covers temporary immersion up to one meter - crucial protection in CNC environments where coolant flooding occurs and motors may be exposed to liquid accumulation.
The Alpha i A16000 pulse coder delivers 16,000 pulses per revolution, providing the FANUC αi servo amplifier with the resolution needed for precision axis control in turning, milling, and machining center applications. This encoder generation communicates natively over FSSB (FANUC Serial Servo Bus) with αi amplifiers, ensuring seamless integration into FANUC CNC systems.
Application Compatibility
The Alpha iS 8/4000 series is engineered for small to medium CNC machine tools - including lathes, machining centers, and milling machines where axis power requirements fall within the 1.5 to 3 kW range and rapid traverse rates demand reliable torque at higher RPM ranges.
The keyed shaft on the B202 variant ensures positive mechanical interlock between shaft and coupling - essential at the torque levels this motor operates, where friction-only couplings risk slipping under reversing loads. For applications requiring a plain (non-keyed) shaft, the B100 and B200 variants within the same A06B-0235 family serve that requirement.
Frequently Asked Questions
What is the difference between the A06B-0235-B202 and other B-suffix variants like B100 or B502?
All variants share the same Alpha iS 8/4000 motor core with 2.5 kW, 8 Nm, and 4,000 RPM specifications. The suffix codes define shaft type, brake inclusion, and encoder. The B202 features a keyed straight shaft, no brake, and A16000 encoder with IP67 protection. The B100 has a plain straight shaft, while the B502 is IP65 rated. Always match the suffix to your machine's mechanical and environmental requirements.
Which FANUC amplifier is this motor designed for?
The A06B-0235-B202 is designed for FANUC αi series servo amplifiers using FSSB communication. The Alpha i A16000 pulse coder communicates natively with these drives. This motor is not directly compatible with older FANUC α (non-i) amplifiers or non-FANUC drives without additional interface hardware.
What does IP67 mean in practical terms for CNC installations?
IP67 certification means the motor is fully dust-tight and can withstand temporary water immersion to 1 meter depth. In CNC environments, this provides comprehensive protection against coolant flooding and splash exposure beyond IP65 standards. Note that the shaft penetration point and connector mating faces are excluded from the IP67 rating, requiring proper cable management.
Can the A06B-0235-B202 be repaired if the encoder fails?
Yes. Encoder replacement on Alpha iS series motors is a standard repair performed by FANUC-authorized service facilities and qualified third-party shops. The A16000 pulse coder can be replaced independently. Bearing replacement and winding inspection are also common service procedures. A full load-tested repair typically offers greater cost efficiency than new replacement for this motor class.
Is the A06B-0235-B202 still available new, or only as refurbished?
New stock availability depends on regional distribution channels and FANUC's current production status for this motor variant. Refurbished and exchange units are widely available through CNC parts markets and represent practical alternatives - provided sellers can confirm the motor has been load-tested on compatible FANUC systems, not merely visually inspected or bench-powered.
The FANUC A06B-0235-B202 is an OEM replacement component. Verify amplifier compatibility, shaft configuration, and encoder type against your machine documentation before installation.
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