Compressor Motor Insulation Assembly for Compact High-Voltage Isolation
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Solution Overview
Problem
Conventional electrically driven compressors for climate-control systems in motor vehicles face challenges in achieving sufficient insulation resistance and preventing short-circuits at high voltage levels, particularly due to defects and porosities in the insulation system, which increases the risk of flashovers and requires significant installation space.
Innovation Solution
The proposed solution involves a compact insulation assembly for an electric motor with a stator core, using multiple insulation elements arranged between conducting wires and the stator core, and a cover element to ensure minimal expansion and hermetic sealing, utilizing a potting material to fill cavities and extend creepage paths, thereby reducing the risk of short-circuits and meeting high-voltage insulation requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation distances are increased to prevent flashovers at high voltage levels, then insulation reliability is improved, but installation space increases
Solution Approach 1:
The patent applies thin film insulation layers (coating layers) on the stator core and insulation papers between conducting wires to achieve sufficient insulation resistance without increasing the overall dimensions of the motor. These thin film structures provide the necessary creepage paths and insulation distances while maintaining compact motor geometry suitable for vehicle installation space constraints.
Solution Approach 2:
The patent employs composite insulation structures combining multiple materials with different properties: coating layers on the stator core, insulation papers between conducting wires, and potting material filling the stator cavity. This composite approach achieves high insulation reliability at high voltage levels (up to 1000 V) while maintaining compact dimensions by optimizing the contribution of each material layer.
2Reliability
If insulation distances are increased to prevent short-circuits, then electrical safety is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple insulation functions into an integrated insulation system where the coating layer on the stator core, the insulation papers between conducting wires, and the potting material work together as a unified structure. This combined approach provides comprehensive electrical safety (creepage paths, insulation distances, and flashover prevention) while avoiding the complexity of separate, discrete insulation components through systematic integration.
3Volume of stationary object
If compact motor design is implemented to reduce installation space, then space requirements are reduced, but insulation resistance deteriorates
Solution Approach 1:
The patent utilizes thin film insulation structures (coating layers on stator core, insulation papers) that provide sufficient insulation resistance within the compact motor dimensions. These thin films maximize the insulation effectiveness per unit thickness, enabling high voltage operation (up to 1000 V) in a space-constrained environment typical of vehicle climate control systems.
Solution Approach 2:
The patent optimizes insulation parameters (thickness, material properties, arrangement) to achieve the required insulation resistance in a compact design. By carefully controlling the parameters of the coating layers and insulation papers, the system achieves adequate creepage paths and insulation distances without increasing the overall motor volume beyond vehicle installation constraints.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances insulation resistance, reduces space requirements, prevents short-circuit currents, and minimizes production scrap and costs, while ensuring compliance with high-voltage insulation standards, thereby extending the service life of the compressor.
Implementation Method 1
utilizing a potting material to fill cavities and extend creepage paths, thereby reducing the risk of short-circuits
Data Source
AI summary
An electric motor having has a rotor and a stator with a stator core as well as an insulation assembly, which extend along a common longitudinal axis from a first end face to a second end face of the stator. The stator core is formed with bars arranged uniformly distributed on the circumference to accommodate conducting wires wound into coils. The insulation assembly has a first insulation element, second insulation elements, and a third insulation element. The first insulation element is arranged between conducting wires and the stator core; a respective second insulation element is arranged in an intermediate space formed between coils arranged to fit closely to one another; and the third insulation element is arranged on an inner side of the stator, the inner side pointing inward in the radial direction, in a manner so as to seal the inner side.