ABB 3HAC021758-001 AC Servo Motor – IRB 140 Series

ABB 3HAC021758-001 AC Servo Motor for IRB 140 Robot Series

The ABB 3HAC021758-001 is a rotational AC servo motor engineered specifically for the IRB 140 compact industrial robot platform. Within the IRB 140’s six-axis kinematic chain, this motor functions as the primary torque-generating element at one of the wrist or arm joints, delivering closed-loop position and velocity control through the robot’s S4C+ or IRC5 controller. Its mechanical and electrical interface is factory-matched to ABB’s drive unit architecture, ensuring deterministic torque response with sub-millisecond latency across the full operating envelope.

The IRB 140 is rated for a 6 kg payload at 0.8 m reach and operates at a TCP speed of up to 2.5 m/s. Achieving that dynamic profile demands servo motors with high torque density, low rotor inertia, and tight encoder resolution. The 3HAC021758-001 satisfies all three requirements through its permanent-magnet rotor construction and integrated multi-turn absolute encoder, which feeds real-time angular position data back to the drive unit without requiring a homing cycle after power restoration.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 3HAC021758-001 employs a surface-mounted permanent-magnet (SMPM) rotor topology. Compared to interior permanent-magnet (IPM) designs, the SMPM configuration yields a lower d-axis inductance differential, which simplifies the field-oriented control (FOC) algorithm executed in the IRC5 drive module and reduces torque ripple at low speeds — a critical factor when the IRB 140 performs precision assembly or arc-welding path interpolation.

The integrated multi-turn absolute encoder eliminates the need for a battery-backed position memory at the axis computer level. On power-up, the encoder transmits the accumulated turn count and fine angular position over the EnDat or Hiperface serial protocol directly to the axis computer board (DSQC 374 or equivalent). This architecture removes the single-point failure risk associated with external battery modules and reduces the axis computer’s boot-to-ready time by approximately 1.2 seconds per axis.

EMC performance is addressed through a combination of motor-side shielding and the cable assembly’s drain wire topology. The motor housing is machined from die-cast aluminium alloy with a continuous ground path to the robot arm structure, providing a Faraday enclosure that attenuates radiated emissions from the PWM switching harmonics (typically 4–16 kHz carrier frequency in IRC5 drives). Conducted emissions on the power leads are suppressed by the drive unit’s output filter, but the motor’s low winding inductance (typically 0.8–1.2 mH per phase) is deliberately matched to that filter’s corner frequency to maintain a flat impedance profile across the audible frequency band.

Thermal management relies on the motor’s aluminium housing acting as a heat spreader into the robot arm casting. The Class F winding insulation provides a 30 °C thermal margin above the Class B rating, accommodating intermittent duty cycles where peak current demand exceeds the continuous rating by up to 2.5× for periods not exceeding 2 seconds — consistent with the IRB 140’s acceleration profile during pick-and-place cycles at maximum payload.

System Integration Benefits

• Zero-homing startup: The multi-turn absolute encoder retains axis position through power cycles, eliminating calibration routines and reducing cell restart time after an e-stop event.
• Deterministic torque response: SMPM rotor geometry combined with IRC5 FOC delivers torque rise times under 2 ms, supporting path accuracy (RP) values of ±0.01 mm as specified in the IRB 140 datasheet.
• Plug-and-play replacement: The M23 combined power/feedback connector and factory-matched encoder parameters mean no drive re-commissioning is required after motor swap — the IRC5 reads the new motor’s electronic nameplate automatically.
• Diagnostic transparency: The encoder’s serial interface exposes temperature, error flags, and turn-count integrity data to the IRC5 axis computer, enabling predictive maintenance alerts before mechanical failure occurs.
• IP67 sealing: The motor body withstands wash-down environments and coolant mist, making the IRB 140 suitable for food-grade and light foundry applications without additional motor enclosures.
• Reduced spare-parts inventory: ABB’s modular motor family shares connector and mounting interfaces across multiple IRB 140 joint positions, allowing a single spare unit to cover multiple axes in some configurations.
• Low rotor inertia: The SMPM topology’s compact rotor diameter minimises reflected inertia at the joint, allowing the IRC5 motion planner to achieve higher acceleration setpoints without exceeding drive current limits.
• Winding thermal monitoring: An embedded PTC thermistor in the stator winding feeds a continuous resistance signal to the drive unit, triggering a controlled deceleration rather than an abrupt e-stop when winding temperature approaches the Class F limit — preserving path integrity and reducing mechanical shock on the gearbox.

Quality Assurance & Global Logistics

Every 3HAC021758-001 unit supplied by siemensplc.com is sourced through verified ABB Robotics distribution channels. Each unit undergoes incoming inspection that includes encoder signal integrity verification, winding resistance balance measurement (phase-to-phase tolerance ±2%), insulation resistance testing at 500 VDC (minimum 100 MΩ), and visual inspection of the M23 connector pins and sealing O-ring. Units that do not pass all four checkpoints are quarantined and returned to the supply chain — none are reworked or re-labelled.

Shipments originate from our warehouse in Xiamen, Fujian Province, China. Xiamen’s Gaoqi International Airport and the Port of Xiamen provide daily freight connections to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East. Standard export packaging uses anti-static foam inserts inside double-wall corrugated cartons, with desiccant sachets to protect the encoder electronics during sea freight transit. DHL Express and FedEx International Priority are the default carriers for air freight, with typical transit times of 3–5 business days to Europe and 2–4 business days to North America. Sea freight consolidation is available for orders of five or more units, with ETA of 18–25 days to European ports.

All units ship with a 12-month warranty covering manufacturing defects in materials and workmanship. Warranty claims are processed within 5 business days of receipt of the defective unit at our Xiamen facility, with a replacement unit dispatched by air freight at no additional charge.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.