Insulation parts
Field Coil Insulation for Universal Motors
Field coil insulation sits in the stator of universal motors and power tools.
Power tool manufacturers use field insulation in the stators of their universal motors. The stator lamination geometry of these motors is complex: the insulation must follow several contours at once and must not shift during winding.
Our goal is to produce parts that fit this geometry as precisely as possible. Accurately embossed bend lines ease assembly without rework and support the winding process. Field insulation is available with or without a cuff.
Our expertise in folding and embossing electrical insulation is why leading power tool manufacturers have trusted Hauler & Hermann for over 60 years.
Why bend lines determine assembly cost
Field insulation without defined bend lines has to be shaped by hand during insertion. That costs cycle time and creates scrap when the insulation tears or slips. Our bend lines are precisely embossed in the tool, so the part folds itself onto the stator geometry during insertion. The result: assembly without rework and a smooth winding process, including on automated lines.
Manufacturing at Hauler & Hermann
The folding and embossing tools are made in our own tool shop using a folding tool system developed in-house, which lets us react extremely quickly to new stator geometries. On request we fit the insulation directly to your lamination stack and create the technical drawing. Depending on thermal class we use flexible sheet insulation such as polyester film, DMD laminate or NPN laminate.
Selection criteria for purchasing and design
Key inputs are the stator lamination geometry, the required thermal class, whether a cuff is needed for creepage distance, and the planned quantity. Universal motors are usually built in high volumes, so we design tools and process for series stability from the start. Samples are available at short notice via our contact form.
Product view
Top view, various shapes, variable lengths
Frequently asked questions
Where is field coil insulation used?
Field insulation sits in the stator of universal motors, as used in power tools and household appliances. It insulates the field coil against the stator lamination stack.
What is the benefit of embossed bend lines?
Embossed bend lines make the insulation fold itself onto the complex stator geometry during insertion. This saves cycle time, avoids rework and reduces scrap in the winding process.
Is field insulation available with a cuff?
Yes, we produce field insulation with or without a cuff. The cuff secures the creepage distance and prevents the insulation from slipping during winding. Whether it is needed depends on the motor's insulation concept.
Which materials does Hauler & Hermann use?
Depending on thermal class we process flexible sheet insulation such as polyester film, DMD laminate or NPN laminate. We match the material to thermal class, geometry and winding process.
Can the insulation be fitted to our lamination stack?
Yes. We fit the field insulation individually to your stator lamination stack, emboss the bend lines accordingly and create the technical drawing for the fitted part on request.
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Learn more →Do you have a specific requirement?
Talk to us. We will find the right insulation solution.