The 1326AB-B520E-21 is a three-phase brushless AC permanent magnet synchronous servo motor manufactured by Allen-Bradley, a brand of Rockwell Automation. It belongs to the Bulletin 1326AB series and is engineered for high-precision motion control in industrial applications. Equipped with a resolver for position and speed feedback, this totally enclosed motor features solid mechanical structure and stable running performance. It is a discontinued legacy model, and refurbished or surplus units are widely used for equipment maintenance and replacement.

1326AB stands for the series of high-performance AC servo motors. B indicates the motor frame size. 520 represents the specifications of power rating and core stack length. E refers to the designed maximum operating speed. 21 denotes the installation form and shaft type with standard IEC metric flange and keyway shaft.

This servo motor is powered by three-phase AC voltage ranging from 380 VAC to 460 VAC with a frequency of 50 Hz and 60 Hz. Its rated operating speed reaches 3000 revolutions per minute under 460 VAC input. The motor adopts totally enclosed non-ventilated structure and complies with standard industrial protection grade. It uses brushless resolver as the feedback component to transmit position and speed signals. The motor winding applies Class F insulation with good heat resistance. The working ambient temperature is from 0 degrees Celsius to 40 degrees Celsius, and the relative humidity ranges from 5 percent to 95 percent without condensation. It is designed for standard panel and flange installation, and runs steadily with low vibration and noise.

It is fitted with a junction box for connecting three-phase main power cables and grounding wire. A dedicated connector is reserved for the resolver to output position, commutation and speed feedback signals. The motor adopts standard IEC flange and keyway shaft as mechanical connection interface to link with loads. It is fully compatible with Allen-Bradley matching servo drives to realize signal interaction and motion control. All wiring ports have basic anti-interference design to adapt to complex industrial electromagnetic environment. There is no independent external communication port, and all control and data transmission are completed through the matched servo drive.

It delivers accurate speed and position control to meet the requirements of high-precision processing and positioning. It maintains stable torque output within the full speed range and provides reliable power for various loads. The built-in resolver ensures continuous and accurate feedback signals for long-term operation. The totally enclosed structure effectively prevents dust and foreign matter from entering the motor interior. It has excellent dynamic response to realize quick start, stop and speed adjustment. The internal thermal protection structure can effectively avoid winding damage caused by overheating during overload operation.

This motor is suitable for various precision automation equipment and machine tools including CNC machining centers, lathes and grinding machines. It is widely applied in automated assembly lines, packaging machinery and material handling equipment. It can also be used in printing and textile equipment that requires stable high-speed operation. It is an ideal replacement part for maintenance and renovation of existing Allen-Bradley servo control systems. It works normally in general factory workshops with moderate dust and vibration.

Cut off the power supply completely before installation. Fix the motor firmly on the equipment base or mounting surface, and keep enough space around for heat dissipation. Connect power cables and feedback cables strictly in accordance with terminal definitions, and ensure reliable grounding. Use standard couplings to connect the motor shaft with the load and avoid shaft misalignment. Complete parameter configuration on the supporting servo drive according to motor specifications. After checking all wiring and settings, power on the system, perform jog test to confirm the rotation direction, and then carry out formal operation.

Carry out regular inspection every three to six months to check the motor appearance, mounting status and cable connection. Cut off power before cleaning, and wipe the motor surface and junction box with dry cloth. Check all wiring terminals regularly and tighten loose connections in a timely manner. Inspect the resolver connector and signal lines to guarantee stable signal transmission. The motor adopts sealed bearings which need no regular lubrication; replace the bearings once abnormal noise or excessive vibration occurs. Store spare motors in cool, dry and dust-free environment. Do not disassemble the motor without authorization, and all inspection and repair work shall be handled by professional technical personnel.