FANUC A06B-0235-B605 AC Servo Motor
AiS8/4000 Tapered Shaft with 90V Brake
Precision Engineering for Critical Applications
The FANUC A06B-0235-B605 is an AiS8/4000 AC servo motor featuring a tapered shaft (TPR) and 90V DC electromagnetic holding brake. This specialized configuration delivers reliable performance for vertical axes, counterweighted spindle heads, and applications where gravity or residual spring force requires secure position holding.
Key Features
- 2.5 kW rated output with 8 Nm stall torque
- 4,000 RPM maximum speed for high-performance operation
- Tapered shaft (TPR) for secure mechanical coupling
- 90V DC electromagnetic holding brake for fail-safe operation
- a64iA encoder with 64,000 pulses per revolution
- IP65 protection rating for industrial environments
Technical Specifications
| Parameter |
Value |
| Model |
AiS 8/4000 |
| Rated Output |
2.5 kW |
| Stall Torque |
8 Nm |
| Stall Current |
11 A |
| Rated Current |
8.3 A (continuous) |
| Maximum Speed |
4,000 RPM |
| Motor Voltage |
184V, 3-phase |
| Frequency |
267 Hz |
| Amplifier Input |
200-240V AC, 50/60Hz |
| Poles |
8 |
| Power Factor |
97% |
| Shaft Type |
Tapered (TPR) with key |
| Electromagnetic Brake |
90V DC |
| Encoder |
a64iA (64,000 ppr incremental) |
| Protection Rating |
IP65 |
| Insulation Class |
F |
| Ambient Temperature |
0-40°C |
| Weight |
Approx. 10 kg |
| Origin |
Japan |
Application Areas
This motor configuration is specifically designed for applications requiring precise speed and positioning control with fail-safe holding capability:
- Vertical machining center Z-axes
- CNC boring machines and quill drives
- Robotic cells with vertical joint axes
- Pallet changers and automated loading systems
- 5-axis rotary tilt tables
Encoder Technology
The a64iA incremental encoder provides 64,000 pulses per revolution, delivering the high-resolution feedback required for precise closed-loop position control across the entire operating speed range. This ensures accurate position tracking during rapid acceleration and deceleration phases.
Frequently Asked Questions
What is the purpose of the tapered shaft compared to straight shaft variants?
The tapered shaft (TPR) creates a mechanical interference fit that distributes clamping force across the entire taper surface. This provides superior resistance to loosening under bidirectional torque reversals and vibration, making it more reliable for high-cycle CNC applications than friction-only straight shaft couplings.
How does the 90V DC brake work and is it safe for vertical axis use?
The brake operates on a spring-engaged, power-released principle. Applying 90V DC releases the brake for normal operation. Removing voltage (during shutdown, emergency stop, or power fault) causes immediate spring engagement, mechanically locking the shaft. This fail-safe design is specifically engineered for vertical axis applications where gravity loading requires secure holding.
Is the a64iA encoder an absolute or incremental type?
The a64iA is an incremental encoder providing 64,000 pulses per revolution. It does not retain position data through power cycles, requiring a homing or zero-return operation at startup. For applications needing absolute position retention, select a variant with an absolute pulse coder.
What amplifier is compatible with this motor?
This motor is designed for FANUC αi series servo amplifiers communicating via FSSB. Use standard 200V-class αi SVM amplifiers and verify the amplifier's current rating accommodates the motor's 11A stall current requirement.
What are the key maintenance considerations for this motor?
Primary maintenance focuses on brake wear (monitor holding torque degradation), tapered shaft fretting (ensure proper coupling torque during installation), and encoder performance (watch for positioning alarms or velocity feedback errors). All components are serviceable through qualified repair facilities.
Note: The FANUC A06B-0235-B605 is an OEM replacement servo motor. Verify amplifier compatibility, brake voltage supply, and shaft coupling design against your machine documentation before installation.
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