A method for preparing an insulated wire

By using modified polyamide-imide varnish to form a multi-layer insulation structure, the problem of insufficient flexibility of polyamide-imide insulated wires at high temperatures is solved, enabling tight arrangement of wires in complex slots and lightweight motors.

CN121148824BActive Publication Date: 2026-03-10WELL ASCENT ELECTRONIC (GANZHOU) CO LTD
2 Cites 0 Cited by

Patent Information

Application Number
CN202511694936.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-11-19
Publication Date
2026-03-10
Estimated Expiration
2045-11-19

AI Technical Summary

Technical Problem

Polyamide-imide insulated wires lack flexibility at high temperatures, leading to cracking of the enamel film. This restricts the tight arrangement of insulated wires in complex slots, affecting the slot fill factor and power density of motors.

Method used

Modified polyamide-imide varnish is used as the topcoat layer. By mixing modified polyamide-imide intermediate with solvent, a multi-layer insulation structure is formed, including a base layer, an optional intermediate layer and a modified topcoat layer, which improves the flexibility and heat resistance of the insulated wire.

Benefits of technology

It maintains good electrical insulation performance at high temperatures, avoids cracking, adapts to complex slot arrangement, improves motor slot fill factor, reduces stator core volume and weight, and achieves lightweighting.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

This invention discloses a method for preparing insulated wires. Specifically, it includes annealing a rolled conductor to obtain an annealed conductor; coating the outer periphery of the annealed conductor with an insulating varnish to form a first pre-formed core wire; curing the first pre-formed core wire coated with the insulating varnish at high temperature to form an insulating layer, obtaining a second pre-formed core wire; coating the outer side of the insulating layer of the second pre-formed core wire with a topcoat containing a modified polyamide-imide intermediate to form a third pre-formed core wire; curing the third pre-formed core wire coated with the topcoat at high temperature to form a topcoat layer on the outer side of the insulating layer, and further obtaining an insulated wire. The insulated wire provided by this invention improves the flexibility of the wire, adapts to more compact arrangement of complex slots, thereby improving the slot fill factor of the motor, thus reducing the stator core volume at the same power, indirectly reducing the weight of the motor, and achieving the requirement of lightweighting.
Need to check novelty before this filing date? Find Prior Art