Why insulation thickness shapes your power tool motor’s performance

Inside every motor, insulation plays a bigger role than many realize. It protects the windings, but it also determines how much copper you can place in the slots and how effectively thermal energy is dissipated from the system. When the insulation becomes thinner, these two factors shift in your favor.

Why insulation is a critical design lever

Your motor’s output depends heavily on how much copper you can fit into the stator slots. Every fraction of a millimeter taken by insulation reduces the available space for windings. Traditional materials such as PA66 or PBT typically require insulation walls around 0.4 to 0.5 millimeter. These are proven, but they limit copper fill and increase thermal resistance.

Thinner insulation allows more active material in the same geometry. The challenge is to find a material that maintains stable mechanical and electrical performance at elevated temperatures and can be processed into thin, dimensionally precise structures.

High temperatures demand more from insulation materials

Modern brushless motors run hotter than ever, especially at high speeds and under continuous load. In these conditions, conventional materials approach their mechanical limits. When insulation softens or deforms, winding stability and long term reliability are put at risk.

To give you more freedom in compact designs, you need an insulation material that withstands high temperatures, maintains strength under stress and allows consistent thin wall molding.

A material designed for thin walls and high heat

Stanyl® PA46 offers a combination of properties that make thin wall insulation practical in demanding power tool motors. Its molecular structure provides:

• Melting point around 295 °C and heat deflection temperature of 290 °C
• Continuous use temperature up to 170 °C
• Mechanical strength maintained under long term heat and vibration

These characteristics allow you to reach insulation thicknesses around 0.25 millimeter while maintaining reliability.

How thinner insulation improves your motor design

A reduction from 0.5 to 0.25 millimeter creates enough extra room to consider a thicker wire gauge. Even a small increase in wire diameter can raise the copper cross section significantly, lowering the electrical resistance. The result is a e-motor that can:

• Deliver higher torque
• Run cooler at the same load

Better heat transfer is an additional benefit. Thinner insulation shortens the thermal path, allowing heat from the windings to reach the stator steel more efficiently. Compared with paper based systems, PA46 also benefits from higher thermal conductivity due to its consolidated structure.

A production friendly solution

You need a material that performs reliably, not only in application, but throughout the manufacturing process. Stanyl® PA46 offers exceptional flow, enabling strong weld lines and stable processing even in very thin sections. The good weld line strength will result in a low scrap rate during the winding process.

For applications where sustainability targets matter, PA46 grades without PFAS and options with reduced environmental impact are available, supporting your long term compliance goals.

What this means for your next power tool platform

By incorporating Stanyl® PA46 in your motor insulation design, you can:

• Increase copper fill and torque density
• Handle higher temperatures without failure due to fatigue
• Reduce overall size and weight
• Extend durability in demanding environments

These advantages help you meet user expectations for smaller, lighter and more capable tools.

Ready to explore new design options

If you want to re-evaluate your insulation approach or explore what thinner walls could mean for your motor design, we invite you to learn more.

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