Genuine Atlas Copco Motor 1091631955: 5.5 kW High-Efficiency Three-Phase Asynchronous Drive Motor

1. Product Overview & Identity Verification

Selecting authentic replacement components is paramount to maintaining the peak operational efficiency, mechanical integrity, and long-term reliability of industrial compressed air systems. The Genuine Atlas Copco Motor (Part Number: 1091631955) serves as the heavy-duty driving heart within mid-to-small-sized industrial oil-injected screw air compressors. As an authentic factory-supplied component, this premium three-phase AC asynchronous motor converts electrical energy into precise mechanical power, driving the screw element directly or via targeted transmission systems. Furthermore, this component offers seamless cross-brand compatibility across various brands under the Atlas Copco Group umbrella, providing engineering teams with a standardized solution for fleet maintenance.

2. Verified Technical Specification Matrix

To assist procurement managers and electrical engineers with precise part matching, the matrix below details the certified electrical and operational specifications derived directly from the authentic manufacturer nameplate. This technical data represents verified factory configurations:

3. Mechanical Design & Physical Interchange Features

Beyond electrical compatibility, field engineers must verify physical mounting dimensions to ensure seamless replacement without modifying the compressor chassis. This unit features a highly optimized, high-power-density mechanical structure:

• Frame Size: 112M. The compact 112M frame provides superior space efficiency compared to generic standard 132S frames, making it ideal for tight, enclosed compressor canopies.
• Mounting Configuration: IM B34. This design incorporates a foot-mounted base combined with a small face-flange containing tapped holes, allowing for versatile and rigid mechanical coupling.
• Bearing Specifications: Premium 6306-2Z/C3 high-clearance, double-shielded precision bearings are pre-installed at both the Drive End (DE) and Non-Drive End (NDE). This standardized configuration simplifies inventory management for maintenance facilities.
• Net Weight: 28 Kg. The low physical weight indicates a refined engineering layout that optimizes heat dissipation without adding unnecessary structural mass to the machine frame.

4. Operating Principle & Heavy-Duty Performance

The motor utilizes a precision-wound 2-pole electrical configuration to meet the high rotational speed requirements of screw compressor air ends. When operating on a 50Hz grid, the motor regulates its rated speed at 2910 r/min, and it accelerates smoothly to 3500 r/min when connected to a 60Hz power source. This ultra-low slip performance ensures that the compressor maintains stable volumetric flow and constant discharge pressure during peak facility operations.

In addition, standard commercial motors typically cap their ambient temperature limits at +40°C. In contrast, Atlas Copco specifies an advanced +46°C maximum ambient threshold (AMB) for this customized unit. This engineering buffer allows the stator windings to withstand high-temperature environments inside enclosed compressor cabinets without suffering from premature insulation breakdown or thermal degradation.

5. Application Range & Brand Compatibility

Part number 1091631955 is a centralized, group-wide standard component designed for fixed-speed industrial screw air compressors. Because the Atlas Copco Group streamlines parts management across its subsidiary global brands, this drive motor provides direct, non-modifiable mechanical compatibility with the following platforms:

• Primary Applications: Fixed-speed工频 screw air compressors, most notably the classic Atlas Copco GX5 and GA5 (Constant Speed) series.
• Cross-Brand Fleet Compatibility: Fits equivalent identical generation machinery from Ceccato, Chicago Pneumatic (CP), Ekomak, Alup, Abac, and Fiac.

6. Engineering Verification & Replacement Guidance

To ensure a safe installation process and prevent operational failures, maintenance teams must adhere to the following technical guidance during onsite replacement:

Electrical Configuration: Electricians must strictly configure the junction box terminal bridges according to the specific starting method utilized by the compressor control cabinet. On a standard 380V/400V industrial grid, configuration requires standard Delta wiring for direct or variable frequency operation, while alternative setups require careful matching to Star-Delta starter cabinets. Incorrect terminal layout will permanently destroy the stator windings upon startup.

Mechanical Verification: Although electrical profiles may match, physical measurements of the shaft diameter, center height, and flange bolt-hole circles must be cross-checked against the B34 installation standard before final torque is applied to the mounting bolts.

7. Frequently Asked Questions (FAQ)

Q1: Is this motor a genuine original Atlas Copco part or an aftermarket alternative?

A: It is a 100% genuine original spare part supplied directly through the factory network. The unit is custom-manufactured by Marathon® Motors exclusively under precise engineering specifications for the Atlas Copco Group, ensuring exact matching with the original machinery design.

Q2: Why is this specific part number not searchable on the public commercial catalog of Marathon Motors?

A: This component is a proprietary, system-integrated spare part custom-engineered for factory equipment. The technical data and procurement paths are restricted to the official parts system to safeguard machinery engineering integrity and prevent facilities from installing non-compliant, standard commercial motors that lack the necessary +46°C thermal limits.

Q3: Can this motor be utilized on a standard 380V 50Hz local power grid?

A: Yes. For standard 380V or 400V 50Hz industrial grids, technicians must connect the internal winding bridges in a Delta configuration inside the motor junction box, provided that the machine configuration supports this deployment.

Q4: Can I use this motor to replace a faulty drive unit in a Chicago Pneumatic compressor?

A: Yes, absolutely. Because the Atlas Copco Group utilizes a shared component strategy across subsidiary brands, part number 1091631955 functions as a universal group cross-reference. If your unit’s original factory parts manual lists this exact number, it will fit perfectly regardless of the cabinet logo.

Q5: How can our procurement team guarantee a 100% precise mechanical fit before placing an inquiry?

A: We highly recommend locating the 10-digit serial number found on the air compressor’s main chassis data plate (not just the old motor tag). Providing this serial number allows us to cross-reference the original factory blueprints to verify absolute compatibility regarding shaft dimensions and specific batch configurations.

If you need other Atlas Copco air compressor motors, we provide more models in the table below or you can submit your requirements to us directly.