FANUC A97L-0218-0929#450N-270 AC Servo Motor – 2000iD Series

FANUC A97L-0218-0929#450N-270 — Joint-Axis AC Servo Motor with Integrated Pinion for 2000iD Heavy-Payload Robots

The FANUC A97L-0218-0929#450N-270 is a rotary AC servo motor with a factory-assembled pinion gear, purpose-engineered for joint-axis drive duty on the FANUC 2000iD heavy-payload robot series. Within the 2000iD kinematic chain — which spans payload ratings from 900 kg to 1,700 kg — each joint axis demands a motor capable of sustaining high continuous torque output while maintaining sub-arc-minute positional fidelity under dynamic load reversals. This unit fulfills that requirement through a combination of FANUC’s proprietary winding geometry, a high-resolution absolute encoder, and a precision-ground pinion interface that eliminates backlash at the reducer input stage.

The #450N-270 suffix designates the 270° mechanical rotation range variant of the A97L-0218-0929 motor body. This range parameter is determined at the joint design level and governs the axis travel envelope; the motor itself is electrically and mechanically identical to the #450N-290 variant, differing only in the pinion engagement geometry that corresponds to the specific joint’s reducer input specification. Both variants are fully compatible with FANUC’s αiF-series servo amplifier modules and the R-30iB / R-30iB Plus / R-30iB Mate Plus controller families.

In automotive body-in-white welding cells, aerospace large-structure assembly fixtures, and heavy-payload palletizing lines, the A97L-0218-0929#450N-270 is the OEM-specified replacement unit. There is no aftermarket equivalent that satisfies FANUC’s torque ripple specification, encoder protocol compatibility, and pinion tooth-profile tolerance simultaneously. Substitution with non-OEM components introduces TCP (Tool Center Point) drift, amplifier fault codes, and accelerated reducer wear — outcomes that are operationally and financially unacceptable in continuous-production environments.

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Technical Parameters

Hardware Logical Analysis

The A97L-0218-0929#450N-270 operates within FANUC’s αi servo drive architecture, where the servo amplifier and motor form a closed-loop torque control system with a cycle time of 125 µs at the current control loop level. The αi Pulse Coder embedded in this motor outputs absolute position data via FANUC’s proprietary serial encoder interface (FSSB — FANUC Serial Servo Bus), eliminating the need for a separate resolver or incremental encoder track. This single-cable feedback architecture reduces wiring complexity at the joint and removes a common failure point in high-vibration environments.

The motor’s stator winding is configured for low cogging torque, a design parameter that is particularly significant in the 2000iD’s low-speed, high-load operating regime. At joint velocities below 5°/s — common during precision placement of heavy workpieces — cogging torque in a poorly designed motor manifests as velocity ripple that propagates through the kinematic chain and degrades TCP accuracy. FANUC’s winding geometry and rotor pole configuration suppress this effect to levels below the amplifier’s current control resolution threshold.

The integrated pinion gear is ground to DIN 5 tolerance class, with a tooth profile matched to the specific harmonic drive or RV reducer input shaft used at the corresponding 2000iD joint. This factory-matched assembly eliminates the field alignment step that would otherwise be required if the motor and pinion were supplied as separate components. The result is a direct-replacement unit that restores the original backlash specification of the joint without requiring reducer disassembly or shimming.

EMC performance is addressed at the motor design level through a combination of shielded stator slots, a grounded motor frame with low-impedance bonding to the robot arm structure, and a ferrite-core filter integrated into the encoder cable exit point. These measures suppress common-mode noise injection into the FSSB feedback line — a critical consideration in welding cells where high-frequency inverter switching from adjacent welding power sources creates a hostile electromagnetic environment.

System Integration Benefits

• Zero re-mastering on identical replacement: Because the αi Pulse Coder retains absolute position data through battery backup, replacing this motor with the same part number — while maintaining encoder battery continuity — does not require robot re-mastering, reducing maintenance downtime to the mechanical swap time only.
• Direct FSSB compatibility: The motor’s encoder communicates natively over FANUC Serial Servo Bus at 16 Mbps, ensuring deterministic feedback latency that the R-30iB controller’s motion planner depends on for accurate trajectory interpolation.
• Amplifier current loop stability: The motor’s electrical time constant and back-EMF coefficient are matched to the αiF amplifier’s current controller gain settings, eliminating the need for amplifier parameter re-tuning after replacement.
• Thermal margin in sustained duty: Class F insulation with a 155°C thermal rating provides a substantial margin above the motor’s continuous operating temperature in standard 2000iD duty cycles, supporting 24/7 production schedules without thermal derating.
• IP67 motor body sealing: The motor body’s IP67 rating permits operation in wash-down environments and protects against coolant mist ingress in machining-adjacent installations — a common deployment scenario for 2000iD robots in die-casting extraction applications.
• Pinion pre-alignment eliminates field error: Factory-assembled and ground pinion removes the risk of field misalignment during installation, which is a documented cause of premature reducer wear and joint backlash growth in non-OEM replacement scenarios.
• Dual-variant inventory simplification: The #450N-270 and #450N-290 share the same motor body, encoder, and amplifier interface. Facilities operating mixed 2000iD configurations can maintain a single motor body as a common spare, with only the pinion sub-assembly differentiating the two variants.
• Diagnostic transparency via FANUC controller: The αi Pulse Coder’s absolute position data enables the R-30iB controller to detect encoder battery low-voltage conditions, absolute position data errors, and communication faults with specific alarm codes (AL-300 series), providing actionable diagnostic information rather than generic drive fault indications.

Quality Assurance & Global Logistics

Every FANUC A97L-0218-0929#450N-270 unit dispatched from our Xiamen facility undergoes a structured pre-shipment verification process. Part number and date code are cross-referenced against FANUC’s official parts catalog. The encoder connector, motor shaft, and pinion tooth profile are inspected dimensionally. Units sourced from decommissioned OEM equipment are accompanied by traceability documentation identifying the originating installation. New-old-stock (NOS) units are verified for encoder battery charge retention and connector integrity.

Packaging is anti-static foam-lined with a moisture-barrier inner bag and a rigid outer carton rated for international air freight handling. Export documentation — commercial invoice, packing list, and HS code declaration — is prepared to the import requirements of the destination country, minimizing customs clearance delays. Shipment is via DHL Express, FedEx International Priority, or UPS Express, with typical transit times of 3–5 business days to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East. A tracking number is provided upon dispatch. The 12-month warranty covers manufacturing defects and encoder data integrity; it does not cover damage resulting from incorrect installation or operation outside FANUC’s specified parameters.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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