At Wm. F. McGraw & Co. in Riverview, MI, we produce precision-made materials that enhance the performance and longevity of electric motors. Our capabilities include insulation for both AC and DC motors, and custom materials made to stringent electrical, thermal, and mechanical specifications. Whether you’re repurposing legacy motors or manufacturing next-gen drives, our components provide uniformity and peace of mind.
We provide vital AC/DC motor insulation products engineered to operate at elevated temperatures, mechanical shock, and extended electrical loads. Each of our parts is engineered to maintain both structural memory and dielectric properties over time, even in the most severe conditions. In application to high-speed industrial drives, customized engine-driven motors, or simply small motor assemblies, we manufacture insulation materials tailored with uniformity and integrity.
We produce stator insulation components that are designed to improve mechanical stability, thermal performance, and insulation strength for all motor sizes. These customized solutions allow motors to run more reliably in extreme circumstances and are also critical to providing optimal performance throughout long operating cycles.
Wedges – provide firm support to the coils, securing windings in place, reducing mechanical wear from vibrations and the centrifugal force on the winding.
Filler Strips – occupy space tightly, doing the windings to improve coil stability and limit movement from magnetic flux interference.
Phase Separators – engage an electrical barrier across phases to prevent arc faults, providing a safety operating envelope in high-voltage motors.
Slot Liners – act as thermal and electrical barriers protecting windings from the sharp edges of slot liners, limiting any dielectric degradation over time.
Terminal Boards – anchor leads accurately, increasing structural support of the high-current termination with minimal dielectric stress for dissipation.
Rotating machinery has unique rotor insulation performance demands due to the extreme conditions in high-speed rotation and unnecessary heat caused by greater thermal cycling. At Wm. F. McGraw & Co., we fabricate rotor insulation for AC motor applications to enhance the longevity and performance of the motor. Each component is manufactured to within tight tolerances using high-temperature composites that minimize thermal expansion, friction, and thermal breakdown.
Slot Liners & Turn-to-Turn Insulation: They isolate wires from the metal core to prevent insulation failure and create insulation systems that isolate the inside wires between internal shorts and surround the outside carrier wiring for added safety under voltage stress.
Slot Filler & Slot Liners: Our fillers occupy empty slot spaces to stabilize windings, while liners act as an abrasion-resistant barrier, shielding wires from sharp core edges and thermal fluctuations.
Washer and Bushings: Provide consistent spacing and support for rotating and static parts. These pieces ensure alignment, absorb shock, and isolate vibration, contributing to mechanical integrity.
Shaft Seals & Threaded Rod: Shaft seals prevent ingress of debris and fluid around rotary elements, while threaded rods secure structural assemblies. Both are essential to maintaining operational cleanliness and stability.
Insulated Tubing: Encases leads and cables to guard against electrical faults and abrasion. Available in various materials, our tubing can meet voltage, heat, and flexibility requirements specific to your application.
We offer a broad range of thermal and electrical insulation materials tailored for high-performance motor systems. These materials are engineered to withstand demanding environments, ensuring reliability and safety. Our selection supports various motor designs and applications, helping improve energy efficiency and component longevity.
Applications: Used for high-load components such as terminal boards, spacers, and end blocks, where exceptional strength and dimensional stability are essential. These composites also perform well in environments subject to heat, moisture, and vibration, making them ideal for mission-critical motor insulation structures.
Benefits: Deliver exceptional high-temperature motor insulation, strength, and electrical isolation even in harsh environments. They resist thermal degradation and mechanical fatigue over extended operation. Designed for structural applications, they maintain dimensional stability and resist cracking under load.
Applications: Thermoplastic materials are ideally suited for components that demand precise geometries and flexibility during fabrication. These include parts like wire sleeves, electrical insulators, end caps, and coil separators. Their adaptability makes them essential for applications requiring consistent shapes across high-volume runs. Thermoplastics are also preferred for protective trays, covers, and molded guides where dimensional accuracy is critical for safe motor assembly and operation.
Benefits: Thermoplastics offer several advantages that enhance motor insulation systems. Their lightweight nature makes them easier to handle and integrate, while their excellent dielectric properties help prevent electrical faults even in compact or high-voltage configurations. These materials demonstrate strong resistance to moisture, oils, and chemical exposure, key benefits in industrial or outdoor motor environments.
Applications: Ideal for intricate parts like covers, insulators, and spacers that require dimensional precision and ease of shaping.
Benefits: Provide lightweight strength, good dielectric properties, and excellent resistance to moisture and chemicals. Their processability allows for custom forming and machining in tight spaces.
Applications: Also suitable where flexibility and cushioning are critical, such as protective trays and vibration-isolating parts.
Benefits: Their adaptability and resilience make them excellent choices for applications that demand both strength and give. Thermoplastics offer consistency across large production runs and are cost-effective solutions for a wide range of motor insulation needs.
Applications: Frequently used for seals, gaskets, and vibration pads in motors exposed to dynamic environments.
Benefits: Withstand a wide range of environmental conditions, from oil exposure to thermal cycling, while remaining flexible and durable. Elastomeric compounds also absorb mechanical shocks, protecting sensitive internal components from operational stress.
We’ve built our name on delivering precision and reliability. Located in Riverview MI, Wm. F. McGraw & Co. brings unmatched experience in fabricating electric motor insulation for both AC and DC systems. Our commitment to quality means every piece is crafted to endure, insulate, and perform. From quick turnarounds to tight-tolerance machining, we are your partner in reliable motor performance.
Whether you’re building new or maintaining old, we’re here to help. Contact Wm. F. McGraw & Co. in Riverview, MI, for tailored motor insulation components and engineered material solutions that support your system from the inside out. Let’s build something powerful together.
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