Electric Motor Rebuild

PERFORMANCE WORK STATEMENT (PWS) FOR One-Time Off Base 300hp Electric Motor Rebuild Serv C26-104 Prepared April 20, 2026 By OC-ALC/OBCA -- 1 of 13 -- Commanders Safety Intent: The safety of everyone on Tinker AFB is our top priority. All Individuals must accept personal responsibility for safety and seek opportunities for improving the safety of our work environment. Everyone working on Tinker AFB is challenged to find, fix (if able) and report all hazards and near-misses. It is our shared duty to take every reasonable step and precaution to prevent accidents and preserve the health/safety of each contractor and government employee. Section One 1.0 Scope: The Contractor shall provide all labor, tools, equipment, test equipment, material, parts, quality control, transportation and inspection manuals necessary to perform the One-Time Repair on Autoclave, Composite Curing 300hp Electric Motor Rebuild for the Oklahoma City–Air Logistics Complex (OC-ALC). The equipment is listed in Appendix B (Off-Base). 1.1.2 The Contractor shall be responsible for ensuring all services, parts and Original Equipment Manufacturer (OEM) components provided under this contract are in accordance with (IAW) the terms and conditions outlined herein, conform to the manufacturer’s equipment specifications and this PWS. 1.2 Known Problems: The electric motor sustained a thermal failure due to overheating, resulting in a short-to-ground condition across two of the three phases. This failure has rendered the motor, and consequently the autoclave, inoperable. 1.3 Requested Services: A one-time service contract to rebuild the electric motor for the Aerospace Service & Controls composite curing autoclave (Model No. EC 15X30). Restoring this equipment to full operational capacity is essential to support 76th Commodities Maintenance Group (76 CMXG) mission- critical operations. The scope of the required service includes the following tasks: • The Contractor shall perform all electric motor repairs, rewinds, and rebuilds in strict accordance with ANSI/EASA AR100 (Recommended Practice for the Repair of Rotating Electrical Apparatus) standards. Upon completion of repairs, the Contractor shall provide a repair report detailing the tests, measurements, and materials used, confirming adherence to EASA AR100 guidelines. • To prevent transit-induced bearing damage from road vibration, the Contractor’s repair facility should be located within a 120-mile radius of Tinker Air Force Base, Oklahoma. If a Contractor's facility is located outside this radius, the Contractor must submit a Formal Motor Transport Plan with their proposal. This plan must detail strict vibration mitigation measures, including mandatory shaft blocking and the use of air-ride suspension trailers to prevent damage to the motor/bearings during transit. -- 2 of 13 -- A: Electric Motor Reconditioning Services a. Definition: Full inspection, cleaning, testing, minor repair (e.g., bearing and seal replacement, lubrication), reassembly, and final testing to restore the motor to original operating specifications without a full winding replacement. b. Detailed Tasks: The contractor shall perform the following: (1) Disassemble and thoroughly clean all components. (2) Inspect stator windings for insulation integrity, connection quality, and signs of overheating. (3) Inspect the rotor for cracks, balance, and bearing journals. (4) Inspect bearings and replace as necessary (to be quoted separately based on motor condition). (5) Replace seals, gaskets, and other wear items. (6) Measure critical dimensions and run-outs. (7) Dynamically balance the rotor assembly. (8) Conduct testing to include: Megger insulation resistance test, surge test, high potential (hipot) test, and no-load test (evaluating amps, volts, speed, and vibration). (9) Repaint the exterior and perform final quality control. B: Electric Motor Rewind Services a. Definition: Complete replacement of stator windings and associated insulation, along with all comprehensive reconditioning steps. b. Detailed Tasks: In addition to all reconditioning services listed under paragraph 1.3.b, the contractor shall perform the following: (1) Remove existing stator windings and insulation. (2) Conduct core loss testing prior to winding removal, after winding removal (if possible), and after the rewind process. (3) Manufacture and install new stator windings using high-quality magnet wire and insulation materials compliant with National Electrical Manufacturers Association (NEMA) standards. (4) Perform winding encapsulation via Vacuum Pressure Impregnation (VPI) or a dip- and-bake process. -- 3 of 13 -- C. Required Scope of Work The contractor shall execute the following specific requirements: a. Full Stator Rewind: Completely remove old windings and perform a full rewind of the stator. b. High-Temperature Insulation System: Utilize a Class H (180°C) or higher corona- resistant insulation system. c. Vacuum Pressure Impregnation (VPI): Treat the rewound stator using a VPI process with a 100% solids epoxy resin to ensure a void-free, sealed winding. Note: A standard dip- and-bake process is unacceptable for this requirement. d. Rotor Balancing: Dynamically balance the rotor to a G2.5 specification or better. e. Bearing and Seal Upgrades: (1) Install new, severe-duty C3 clearance sealed bearings from a major premium manufacturer (e.g. SKF, FAG, NSK or NTN). (2) Install upgraded labyrinth or magnetic bearing isolators (e.g., Inpro/Seal or equivalent) on both the drive-end and non-drive-end shafts. f. Protective Coating: Prepare the motor exterior and coat it with a high-performance, corrosion-resistant epoxy paint. g. Complete Test Report: Conduct comprehensive final testing upon completion. The contractor shall provide a final test report that includes, at a minimum: (1) Insulation resistance (Megger) readings (phase-to-phase and phase-to-ground). (2) Winding resistance readings. (3) Surge test results. (4) No-load run…