Allen‑Bradley H-4050-P-H04AN Brushless Servo Motor

Product Overview

Model Code Decoding

• H: Low inertia H-series brushless servo motor family
• 4050: Frame size 4050 (4-inch NEMA frame, medium stack length)
• P: Motor winding voltage grade (230V AC class)
• H: Encoder resolution = 2000 lines incremental optical encoder
• 04: Integrated 24VDC electromagnetic holding brake
• AN: Standard NEMA 56C round mounting flange, keyed solid output shaft

Core Electrical & Mechanical Specifications

Electrical Performance

• Pole count: 6 poles
• Rated continuous stall torque: ~12.8 N·m
• Peak torque: ~32.2 N·m
• Rated speed: 3000 RPM; Maximum mechanical speed: 4000 RPM
• Rated power output: ~3.8 kW
• Rotor inertia: Low-inertia rotor design for fast dynamic response
• Winding insulation: Class F high-temperature magnet wire
• Brake: 24VDC spring-applied holding brake, static holding torque matches stall torque rating
• Encoder: 2000-line differential incremental optical encoder with index pulse, high noise immunity for long cable runs

Mechanical Construction

• Mounting standard: NEMA 56C round flange
• Shaft: Keyed solid steel output shaft, standard shaft sealing
• Connectors: Separate circular bayonet power connector and encoder feedback connector
• Enclosure: TENV totally enclosed non-ventilated housing, IP54 standard shaft protection
• Net weight: ~9.6 kg
• Friction torque: 0.068 N·m; Damping coefficient: 0.045 N·m/(krpm)
• Phase-to-phase winding inductance: 3.3 mH

Environmental Ratings

• Operating ambient temperature: 0 °C ~ +40 °C (full load without derating)
• Storage temperature: -30 °C ~ +70 °C
• Humidity: 5%–95% non-condensing
• Vibration & shock: Compliant with industrial IEC 60068 mechanical test standards
• Certifications: UL/cUL, CE industrial automation certified

Compatibility

• Matching servo drives: Allen‑Bradley 1398 Digital Servo Amplifier series
• Control platform: Legacy SLC 500, ControlLogix with 1398 motion modules
• Servo cables: Standard H-series motor power & encoder extension cables

Main Functions

1. High Dynamic Reciprocating Motion Control

    

   Low-inertia rotor delivers ultra-fast acceleration/deceleration and short settling time, ideal for high-cycle repeated positioning axes on CNC, cutting and packaging machinery. Sinusoidal winding minimizes torque ripple for smooth low-speed constant-torque operation.
2. Precision Closed-Loop Position & Velocity Feedback

    

   2000-line differential optical encoder transmits real-time position, speed and index pulse signals to the 1398 drive, supporting micron-level positioning accuracy for indexing, contouring and gantry synchronization.
3. Static Load Holding via Integrated 24V Brake

    

   Spring-applied holding brake engages automatically when motor power is cut, locking vertical axes, gantry arms and heavy tooling to prevent gravity drop during power loss or equipment shutdown.
4. Stable Continuous Heavy-Duty Operation

    

   TENV fully sealed housing blocks workshop dust, oil mist and coolant ingress; Class F windings sustain long-duration continuous torque output without thermal overheating for 24/7 production lines.
5. Legacy Motion System Coordination

    

   Works with 1398 drive systems to execute electronic gearing, cam profiling and multi-axis interpolation motion logic for older CNC machine tools and custom automated equipment.
6. Full Diagnostic Compatibility

    

   Encoder fault, brake circuit and motor winding error signals are transmitted to the drive for PLC fault logging and on-site troubleshooting.

Key Advantages

• Low-inertia rotor design delivers superior dynamic response vs medium/high inertia motors for high-speed cycling equipment
• Built-in factory-matched 24V brake eliminates separate brake assembly installation and wiring
• Robust 6-pole heavy-duty torque output handles high static and peak dynamic loads
• Standard NEMA 56C flange for drop-in replacement of legacy H-series servo motors without mechanical rework
• Differential encoder wiring resists electromagnetic interference near inverters and high-power drives
• Discontinued OEM model available as fully load-tested refurbished units for equipment maintenance
• Sealed TENV construction eliminates cooling fan failure points and reduces routine maintenance
• Fully compatible with the entire 1398 servo drive ecosystem, consistent programming logic within Rockwell motion control software

Typical Applications