Compressor Motor Stator Insulation Layout for High-Voltage Clearance
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Solution Overview
Problem
Conventional electrically driven compressors for motor vehicle air-conditioning systems face challenges in achieving sufficient insulation clearances at high voltage levels, leading to risks of electrical flashover and short-circuits due to narrow clearances and manufacturing imperfections in the insulation system.
Innovation Solution
The design incorporates a stator with enamelled copper wire coils, a hollow-cylinder-shaped insulation element, and a cover element with potting compound to ensure electrical insulation between conducting wires and conductive components, reducing the risk of flashover and short-circuits by increasing insulation resistance and creepage distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the clearances between stator and housing are reduced to minimize mounting space, then the device size is reduced, but the insulation resistance decreases leading to higher risk of electrical flashover
Solution Approach 1:
An insulation element is introduced as an intermediary component between the stator and housing. This insulation element extends in the radial direction and provides the necessary electrical insulation, allowing the stator to be positioned closer to the housing while maintaining sufficient creepage distances and insulation resistance for high voltage operation.
Solution Approach 2:
The insulation element extends axially beyond the stator core on the end face, utilizing the axial dimension to provide additional insulation path length. This allows the radial clearance to be reduced while maintaining adequate insulation through the combined axial and radial insulation paths.
2Ease of manufacture
If conventional insulation methods are used, then manufacturing is simpler, but sufficient insulation clearances cannot be achieved at high voltage levels
Solution Approach 1:
The insulation element is produced as an integral part of the stator core, combining the stator core and insulation element into a single composite component. This ensures consistent insulation quality and eliminates the need for separate insulation installation steps, maintaining ease of manufacture while achieving reliable high-voltage insulation clearances.
3Device complexity
If connecting cables are routed along end faces without insulation coverage, then device complexity is reduced, but the risk of electrical flashover increases due to insufficient insulation
Solution Approach 1:
The insulation element serves multiple functions simultaneously: it provides electrical insulation for the stator, extends the insulation coverage to areas where connecting cables are routed along the end face, and maintains structural integrity. This multi-functional design ensures comprehensive insulation without significantly increasing device complexity.
Data Source
AI summary
A device and a method for manufacturing the device for driving a compressor, in particular an electric motor, with a rotor and a stator with a stator core, which are arranged along a longitudinal axis. The stator exhibits connecting cables produced as sections of conducting wires of coils, and connection lines, that are arranged on a first end face of the stator, one insulation element whose wall that is produced essentially with a hollow-cylinder shape projects beyond the stator core on the first end face of the stator in the axial direction, as well as one cover element with mounting elements with connection passages for mounting plug-in connectors, which each are fully enclosed by a wall. A volume enclosed by the stator core, the cover element and the wall of the insulation element which projects beyond the stator core is filled at least zonally with potting compound.