Kollmorgen TT2931-1011-AA DC Servo Motor (with Tachometer Generator)

I. Product Overview

TT2931-1011-AA is a high-performance brushed DC servo motor from Kollmorgen's Inland TT series, integrating a coaxial DC tachometer generator for analog speed feedback. This model is a NEMA 34 frame, 48VDC-powered, with a rated torque of 5.2Nm, a maximum speed of 4500rpm, IP65 protection, standard keyway shaft, military-grade connectors, and is a precision drive unit. It is mainly characterized by high torque density, ultra-smooth low-speed operation, pure analog tachometer feedback, wide temperature reliability, natural cooling, and is designed for high-precision analog servo closed-loop systems, aerospace, military, precision machine tools, special automation, etc., which have strict requirements for stability and anti-interference.

II. Model Code Interpretation (TT2931-1011-AA)

TT: Kollmorgen DC servo motor + built-in coaxial tachometer generator Standard Series

2931:

29: Frame diameter (2.93 inches / 74.4mm, corresponding to NEMA 34 standard)

31: Motor stack length (standard medium-long rotor, high-torque configuration)

1011:

10: Armature winding specification (10-number winding, 48VDC medium-high current characteristics)

11: Tachometer generator specification (11-number high-sensitivity low-distortion output)

AA:

A: Installation type (NEMA 34 standard flange installation, B5 equivalent)

A: Shaft end / Feedback / Protection / Connection (standard shaft + keyway, IP65 housing, tachometer feedback, military circular connector)

III. Core Technical Parameters

(1) Electrical Parameters (DC Servo)

Rated Voltage: 48VDC (compatible with 24~60VDC)

Continuous Power: 250W (natural convection cooling)

Continuous Stalling Torque: 5.2Nm

Peak Torque: 15Nm (3× overload, short time)

Continuous Current: 10.5A

Peak Current: 31.5A

Torque Constant (Kt): 0.495Nm/A

Reverse Electromotive Force Constant (Ke): 5.0V/1000rpm

Armature Resistance: 0.38Ω

Armature Inductance: 0.85mH

Rated Speed: 3000rpm

Maximum Speed: 4500rpm

Regulation Method: Precious metal brushes (long-life, low-spark)

Insulation Class: F Grade (155℃)

Thermal Protection: Built-in PTC thermistor (over-temperature protection at 155℃)

(2) Tachometer Generator (Tach) Parameters

Feedback Type: Coaxial DC tachometer generator (pure analog, no electronic components)

Output Sensitivity: 5.0V/1000rpm (±1% linearity)

Output Ripple: <1.5% (peak-to-peak) (ultra-low ripple)

Linearity: ±0.4% (full speed range)

Output Impedance: <100Ω (low-resistance direct drive analog controller)

(3) Mechanical Parameters

Frame Size: NEMA 34 (86mm × 86mm flange)

Shaft Diameter: 14mm (standard 5×5×20mm keyway, shaft)

Rotor Inertia: 0.00045kg·m² (low inertia, high dynamics)

Overall Weight: 2.3kg

Bearings: Double-row precision ball bearings

Mechanical Life: ≥20,000 hours (rated conditions)

Cooling Method: Natural convection (no fan)

(4) Environment and Connection

Protection Grade: IP65 (full housing sealing, oil-proof, dust-proof, splash-proof)

Operating Temperature: -40℃ ~ +85℃ (military-grade wide temperature)

Storage Temperature: -55℃ ~ +125℃ Connector: 2×MIL-C-5015 military circular connector

Power: 2 pins (armature +, armature -)

Feedback: 4 pins (speed measurement +, speed measurement -, brush monitoring, ground)

Certifications: CE, UL, cURus, MIL-STD-810 military certifications

IV. Core Product Characteristics

NEMA 34 high-torque DC servo

74mm small body output 5.2Nm continuous torque, torque density >2.26Nm/kg, natural cooling without fan, 48VDC low-voltage safe power supply, suitable for equipment with limited space, requiring low-voltage high-torque, without cooling duct. 

Ultra-low ripple analog speed feedback

11th high-specification speed sensor, 5.0V/krpm output, <1.5% ripple, ±0.4% linearity, pure analog without batteries, never loses data, resistant to strong electromagnetic interference, perfectly suitable for old-fashioned analog servo systems, military fire control, aviation onboard, without digital bus scenarios.

Precious metal brush long-life reliable

Using precious metal composite brushes, sparking is minimal, lifespan 5000~10000 hours, low-speed zero pulsation, ultra-smooth operation, supports point movement, micro movement, frequent start-stop, ultra-low speed (<1rpm) precise positioning.

Military-grade wide-temperature IP65 protection

-40℃~+85℃ wide temperature, IP65 fully sealed, military connector, resistant to vibration impact, resistant to salt fog and oil stains, suitable for harsh environments such as aviation, ships, vehicle-mounted, field, extreme industry, 24-hour continuous operation.

Low inertia high dynamic response

Rotor inertia only 0.00045kg·m², torque response <1ms, maximum 4500rpm, acceleration / deceleration extremely fast, suitable for high-speed positioning, rapid reciprocation, high dynamic response precision servo systems.

Standard interface plug-and-play

NEMA 34 standard flange, 14mm keyway shaft, 48VDC, 5.0V/krpm speed sensor, military connector, directly replace TT series motors of the same specification, no need for modification, plug-and-play, system compatibility is extremely strong.

V. Typical Application Scenarios

Aerospace: onboard radar / optical sight, satellite antenna, flight simulator, valve control

Military equipment: fire control system, optical turntable, vehicle servo, ship stability platform, weapon drive

Precision machine tools: coordinate boring machine, external grinding machine, optical processing, ultra-precision positioning, dividing head

Simulation system: old-fashioned servo retrofit, analog closed-loop, without digital bus, highly reliable control

Semiconductor equipment: probe table, dicing machine, packaging machine, inspection instrument (low-speed stable, high precision)

Medical equipment: surgical robot, imaging equipment, life support instrument (quiet, reliable)

Special automation: packaging machinery, printing equipment, textile machinery, robot joints (low-voltage safe)

VI. Suggested Accessories and Selection

Compatible drivers: Kolmos Goldline, S300, B-200/B-400, AX-2000; third-party 48VDC analog DC servo drivers

Recommended cables: military specification 2×1.5mm² (power), 4×0.5mm² (feedback), shielded twisted pair

Maintenance: Brushes can be replaced on-site, supports precision grinding of commutators, extends the overall machine lifespan

Comparison selection: Compared with TT2931-1010-AG, torque increases by 189%, power increases by 38%, speed sensing sensitivity increases by 67%, it is the upgraded model for heavy-load precision analog servo systems

VII. Summary of Product Advantages TT2931-1011-AA is a top-level DC servo with NEMA 34, 48VDC, 5.2Nm, 4500rpm, 5.0V/krpm ultra-low ripple speed measurement, IP65, military wide temperature range, natural cooling. Core advantages: high torque density, ultra-smooth at low speeds, pure analog zero failure, military-grade reliability, low voltage safety, low inertia high dynamics, IP65 protection, standard interface easy integration. It perfectly meets the military/aerospace/precision industrial requirements of analog closed-loop, high precision, high reliability, extreme environments, low voltage large torque. It is the preferred model for heavy-load precision analog servo systems, upgrading old equipment, and high-reliability special drives.