Allen Bradley 1326AB high-performance AC servo motor

Allen Bradley 1326AB high-performance AC servo motor

Product Overview and Core Positioning

1. Product type and applicable scenarios

The 1326AB series is a three-phase brushless permanent magnet synchronous servo motor designed for high-precision motion control, compatible with Allen Bradley 1391 AC servo controller. It is widely used in machine tools, automated production lines, material handling and other scenarios that require precise positioning and high-speed response. It supports various mechanical structures such as screw drive, gear rack drive, conveyor belt drive, etc.

2. Core standard features

Performance Design:

Permanent magnet rotor structure improves servo response speed; Sine wave winding stator achieves low-speed smooth operation and efficient heat dissipation.

100% continuous rated locked rotor torque at zero speed, meeting the requirements for maintaining static load.

Feedback system:

Standard brushless rotary transformer, providing position, commutation, and speed feedback, without built-in electronic components, suitable for harsh environments.

Supports 1391 A Quad B encoder output (up to 2048 PPR), achieving high-precision position detection through rotary transformer signal conversion.

Protection and reliability:

TENV (fully enclosed non ventilated) structure, optional shaft seal kit (1326AB-MOD-SSV-xx) can achieve IP65 protection level (dustproof, anti pulsating water flow), but IP65 fails when external encoder/rotary transformer or fan is connected.

The winding is equipped with a normally closed thermal switch (115V AC/1A, 24V DC/1A) to achieve overheating protection, with a trigger temperature of about 150 ° C and a reset temperature of 90-100 ° C.

Installation and compatibility:

Supporting vertical/horizontal axis installation, the rotor dynamic balance accuracy reaches 0.0005 inches (0.0127mm) peak to peak displacement, reducing operational vibration.

Equipped with MIL standard connectors, the power and feedback cables support standard flexibility, high flexibility of drag chains (- T suffix), and ultra long (ES suffix, up to 300 feet/91.4m) versions, adapting to different installation distance requirements.

Model interpretation and optional configurations

1. Model coding rules (taking 1326AB-A1G-11-A4 as an example)

Explanation of the meaning of digit codes

1-4 Position 1326 Product Series AC Servo Motor

5th motor type A AC permanent magnet synchronous

6th B frame diameter A=4.25 inches (108mm), B=5.88 inches (149mm), C=7.63 inches (194mm)

The 7th position A is distinguished in alphabetical order based on the stacking length within the same framework (A<B<C<D, with increasing length and greater torque)

8th highest speed G=5000rpm, E=3000rpm, C=2000rpm, B=1600rpm

Installation of positions 9-10 and shaft type 11=NEMA British flange+keyway shaft; 21=IEC metric flange+metric shaft

The 11th to 12th positions of A4 can be selected with attachment A series=90V DC brake (A4=72 lb in/8.1N · m, A5=120 lb in/13.6N · m, A7=400 lb in/45.2N · m); K series=24V DC holding brake (K4/K5/K7 correspond to the same torque)

2. Key optional configurations

Configuration Type Model/Option Code Function Description

The 1326-MOD-BPS brake power supply converts 115V AC to 90V DC and is compatible with A-series brakes. A single unit can drive 4 brakes

Shaft seal kit 1326AB-MOD-SSV-xx on-site installation of Viton material shaft seal, no need to disassemble the motor, compatible with A/B/C series

Feedback component 1326AB-MOD-Vxxxx 4.25-inch (108mm) rotary transformer, supports absolute/fine adjustment format, compatible with 8600GP, IMC and other controllers

Junction box 1326AB-MOD-RJxx axial lead out connector (replacing radial default), maintaining IP65 protection, compatible with A/B/C series

Fan cooling 1326AB-MOD-G3/G4 G3=C2E/C4B motor rear fan; G4=C4B motor "saddle shaped" fan, increasing torque output by 35%

Cable 1326 CPxx (power supply), 1326 CFx (commutation) standard length 15-100 feet, ES version up to 300 feet, only compatible with 1391B-ES/DES driver

Performance parameters and characteristic curves

1. Core performance parameters (typical model examples)

Motor model: Continuous locked rotor torque (lb in/N · m), peak locked rotor torque (lb in/N · m), rated speed (rpm), rotor moment of inertia (lb in s ²/kg-m ²), rated power (kW), continuous current (A)

1326AB-A1G 16/1.8 48/5.4 5000（1391B）/6000（ES/DES） 0.004/0.0005 0.9 4.5

1326AB-B2E 102/11.5 204/23.0（1391B）/279/31.5（ES/DES） 3000（1391B）/4000（ES/DES） 0.05/0.006 2.5 16.4

1326AB-C3E 310/35.0 568/64.1 3000（1391B）/4000（ES/DES） 0.22/0.024 7.5 49.1

1326AB-C4B 420/47.5 840/94.8（1391B）/989/111.8（ES/DES） 1600（1391B）/2000（ES/DES） 0.29/0.032 5.6 38.2

2. Interpretation of speed torque curve

Curve type: divided into two curves: 1391B controller (regular mode) and 1391B-ES/DES (enhanced mode). The peak torque of the former is twice the continuous torque, while the latter can reach three times, and the highest speed is increased (such as A1G from 5000rpm to 6000rpm).

Operating area:

Rated operating zone: Both the motor and controller shall not exceed the RMS rated value, meeting the continuous operation requirements. The calculation formula is:

Torque (T pa=peak acceleration torque, T ss=steady-state torque, T pd=peak deceleration torque, T r=static torque)

Intermittent operation zone: suitable for acceleration and deceleration scenarios, with a duty cycle RMS torque ≤ rated torque to avoid overheating.

Installation and Dimensional Specifications

1. Mechanical installation requirements

Rail adaptation: The A/B/C series both support 35 × 7.5mm DIN rails (models 199-DR1, etc.). The top hook of the module is locked by rotation after being hooked in, and the grounding resistance should be ≤ 2 Ω (detected through the metal shell of the RS-232 port).

Axial load limit: Radial and axial loads must meet the bearing life requirements (B10 life of 15000 hours). Taking the C series as an example, the maximum radial load at 500rpm is 900lbs, and the axial load is 600lbs (refer to the load curve in Figure 8 for details).

2. Key dimensions (taking imperial flanges as an example)

Series length AD (inches) flange diameter O (inches) shaft diameter U (inches) keyway size (inches) with brake length increase (inches)

A1x-11 8.69 4.38 0.625 0.19×0.19×1.38 2.25

B2x-11 13.16 5.88 1.125 0.25×0.25×1.50 2.25

C3x-11 17.38 7.63 1.375 0.31×0.31×2.00 2.5

3. Cable installation

Wiring specifications: Power cables (1326-CPABxx) are wired by color (red=PWR, white=CAN_S, blue=CAN_L, black=COM, bare wire=shielded); The feedback cable (1326 CFUxx) needs to distinguish between the switching signal and the encoder signal, and the shielding layer should be grounded separately.

Bending radius: The standard cable has a single bending radius of ≥ 2 inches (50.8mm), and the high flexibility drag chain cable has a bending radius of ≥ 6.8 inches (172.7mm). Before installation, it needs to be laid flat for 24 hours to release internal stress.

Application Selection and Calculation Guide

1. Selection steps

Determine the speed requirement: Calculate the peak speed of the motor based on the mechanical transmission ratio (for example, if the lead screw is 2 inches and the slide table speed is 400ipm, then the motor speed=400/2=200rpm, with a 20% margin to be reserved).

Calculate continuous torque: Taking screw drive as an example based on load type (friction, cutting force, etc.):

T m=6.28 × e 1 × e 2 × G.R. (W 1 × u+Trust) × Lead × 1.1 (W 1=slide weight, u=friction coefficient, Lead=lead screw, e 1/e 2=lead screw/gearbox efficiency, G.R.=transmission ratio, 1.1 is safety factor)

Verify peak torque: Considering acceleration and deceleration requirements, the calculation formula is:

Peak torque (J total=total moment of inertia, Δ rpm=speed change, t accel=acceleration time, T l=load torque)

Match motor parameters: Ensure that the peak speed of the motor is ≥ the calculated value, the continuous torque is ≥ the required value, and the total inertia is ≤ 5 times the motor inertia (to avoid response lag).

2. Typical application calculation example (screw drive)

Known conditions: slide weight of 500lbs, friction coefficient of 0.05, lead screw of 1 inch, transmission ratio of 1:1, efficiency of 0.9, acceleration time of 0.5 seconds, and speed from 0 to 1000rpm.

Continuous torque calculation: T m=6.28 × 0.9 × 1 (500 × 0.05) × 1 × 1.1 ≈ 5.0 lb in, select A1G (16 lb in) to meet the demand.

Peak torque calculation: Total inertia=sliding table inertia (386500 × (6.281) 2 ≈ 0.0033 lb in ²)+motor inertia (0.004)=0.0073, peak torque=9.6 × 0.5 0.0073 × 1000+0 ≈ 1.52 lb in, which is less than the A1G peak value of 48 lb in and meets the requirements.

Maintenance and safety precautions

Thermal protection: The maximum temperature of the motor winding is 150 ° C (H-class insulation). When the ambient temperature exceeds 40 ° C, it needs to be de rated for use (for every 10 ° C increase, the torque is de rated by 10%).

Brake usage: The brake is only used for static load holding (switching ≤ 90 times per hour) and cannot be used for positioning or frequent braking. The 24V DC brake requires the user to provide their own power supply (0.88-1.2A).

Protection level: IP65 is only applicable to situations with shaft seals and no external feedback/fan. Additional protection is required in humid or corrosive environments.

Troubleshooting: When triggering the thermal switch, it is necessary to first investigate issues such as excessive load and poor heat dissipation. Resetting requires waiting for the winding temperature to drop to 90-100 ° C.