ABB TMA 2B Modules: 3HAC049856-003 & Full Series

Technical Dossier

Product Details And Specifications

ABB TMA 2B Series: Comprehensive Module Range and Technical Overview

The ABB TMA 2B series comprises the axis motor and drive train assemblies used in ABB's IRB 6640 industrial robot platform — one of the most widely deployed 6-axis articulated robots in heavy-cycle manufacturing environments including automotive body shops, chemical processing facilities, nuclear material handling cells, and petroleum refinery automation lines. The TMA 2B designation refers to the Teach Motor Axis 2B sub-assembly, which integrates a brushless AC servo motor with a precision-machined pinion gear for direct coupling to the robot's axis 2 gearbox. Installed base spans multiple continents, with documented deployments in Tier 1 automotive OEM plants across Europe, North America, and East Asia. The IRB 6640 platform, for which TMA 2B components are specified, carries a rated payload of 130–235 kg and a reach envelope of 2.55–3.2 m, making it a standard workhorse in high-duty-cycle arc welding, material handling, and press tending applications.

The Evolution of TMA 2B Architecture

The TMA 2B motor assembly is part of ABB's third-generation IRC5 controller ecosystem, introduced in 2005 as a successor to the S4C+ platform. The IRC5 architecture standardized the use of brushless AC servo motors across all six axes, replacing the earlier DC motor designs used in S4 and S4C systems. The TMA 2B unit specifically addresses axis 2 — the primary shoulder joint — which bears the highest static and dynamic load in the kinematic chain. Early IRC5-era TMA 2B units (pre-2010) used a single-cable motor feedback interface; post-2012 revisions integrated resolver-based absolute encoders with enhanced EMI shielding to comply with updated IEC 61800-3 emission standards. Compatibility between early and late TMA 2B revisions requires verification of the motor feedback connector pinout (12-pin vs. 17-pin variants) and the pinion module specification (M3 vs. M4 tooth profile). The IRB 6640 platform reached end-of-active-production in 2022; ABB's current equivalent is the IRB 6700 series, which uses a redesigned TMS motor family with incompatible mechanical interfaces. Operators maintaining IRB 6640 fleets must source TMA 2B components from authorized spare parts channels or certified secondary-market suppliers.

TMA 2B Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified TMA 2B and directly associated IRB 6640 axis motor and drive train components. Each entry reflects a distinct functional specification within the series.

3HAC049856-003: TMA 2B Rot AC motor incl. pinion — Axis 2 primary shoulder servo motor assembly with integrated pinion for IRB 6640/130–235 kg variants.
3HAC026268-001: IRB 6640 Axis 2 gearbox unit — Precision planetary gearbox mating directly to TMA 2B pinion output shaft.
3HAC14550-2: Motor cable axis 2 — Shielded power cable assembly, IRC5 controller to TMA 2B motor terminal.
3HAC14550-3: Resolver cable axis 2 — Feedback signal cable, resolver to IRC5 drive module, axis 2 specific.
3HAC031683-001: TMA 2B motor bracket — Precision-machined aluminum mounting bracket for axis 2 motor housing.
3HAC025562-001: Pinion gear M3 — Replacement pinion gear, M3 tooth profile, for early-revision TMA 2B units (pre-2012).
3HAC025562-002: Pinion gear M4 — Replacement pinion gear, M4 tooth profile, for post-2012 TMA 2B revision units.
3HAC028357-001: Axis 2 motor seal kit — O-ring and lip seal set for TMA 2B motor housing ingress protection (IP67).
3HAC026268-002: IRB 6640 Axis 2 gearbox — High-payload variant (235 kg) gearbox, increased torque rating vs. -001 revision.
3HAC14551-1: Motor cable axis 1 — Power cable for axis 1 base rotation motor; cross-reference for TMA 2B wiring harness routing.
3HAC031682-001: TMA 1 motor assembly — Axis 1 base rotation AC servo motor; functionally parallel to TMA 2B in IRC5 architecture.
3HAC049856-001: TMA 2B Rot AC motor — Base variant without pinion; used in configurations where pinion is sourced separately.
3HAC049856-002: TMA 2B Rot AC motor — Intermediate revision; modified resolver connector pinout (17-pin).
3HAC049856-004: TMA 2B Rot AC motor incl. pinion — High-ambient-temperature variant (rated to +55°C continuous), for foundry and press shop environments.
3HAC028356-001: Axis 2 encoder disc — Replacement resolver disc for TMA 2B absolute position feedback system.
3HAC031684-001: TMA 2B motor cover — Protective end-cap assembly for TMA 2B motor rear housing; prevents contamination ingress during storage and transport.

Sourcing Hard-to-Find & Obsolete TMA 2B Parts

The IRB 6640 platform entered end-of-active-production status in 2022. ABB's standard spare parts support window extends 10 years post-production, placing the TMA 2B series in a managed lifecycle phase through approximately 2032. However, high-demand SKUs such as 3HAC049856-003 and 3HAC026268-001 are subject to extended lead times through OEM channels due to reduced manufacturing volumes. DriveKNMS maintains a dedicated inventory of TMA 2B series components sourced from decommissioned IRB 6640 units, authorized distributor overstock, and factory-surplus channels. All units are cataloged by revision level and pinion profile variant. For operators running multi-robot IRB 6640 cells, DriveKNMS offers bulk reservation agreements to secure critical axis motor assemblies against unplanned downtime. Emergency same-day dispatch is available for in-stock SKUs. Contact the procurement team with your robot serial number and axis configuration to confirm exact part compatibility before ordering.

Quality Control for the TMA 2B Range

TMA 2B motor assemblies undergo a structured inspection and functional verification protocol prior to dispatch. Each unit is subject to: (1) visual inspection of motor housing, pinion gear tooth profile, and connector integrity; (2) insulation resistance test (megger test) at 500 VDC between motor windings and chassis ground, minimum acceptance threshold 100 MΩ; (3) winding resistance balance check across all three phases (±5% tolerance); (4) resolver signal output verification using a dedicated IRC5-compatible test bench, confirming absolute position feedback accuracy within ±0.1°; (5) pinion gear backlash measurement against OEM specification (maximum 0.05 mm at pitch circle); (6) dynamic run-in test at rated speed (typically 3,000 RPM) for 30 minutes with thermal monitoring. Units failing any criterion are quarantined and not offered for sale. Test records are retained and available upon request for quality-critical applications including nuclear and pharmaceutical environments.