Motor Stator Cover Locking Structure for High-Voltage Insulation
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Solution Overview
Problem
Existing motors designed for low voltage operation experience a reduction in insulation distance and dielectric breakdown when used with high-voltage power supplies due to openings in the cover's top wall, which is insufficient for high-voltage applications.
Innovation Solution
The motor design includes a cover with locking fingers on its peripheral wall engaging with corresponding locking surfaces on the electrical insulator assembly, eliminating openings at critical positions to maintain insulation performance, and features projections and recesses for secure mounting and positioning, ensuring the cover is securely attached without reducing electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If openings are formed in the top wall of the cover for mounting mechanisms, then the cover can be securely mounted on the electrical insulator assembly, but the insulation distance is decreased leading to dielectric breakdown in high-voltage operation
Solution Approach 1:
The patent applies local quality by differentiating the top wall structure into two regions: a first region with openings for mounting mechanisms and a second region without openings for maintaining insulation. This localized differentiation allows the cover to simultaneously achieve secure mounting where needed while preserving insulation distance in critical high-voltage areas.
2Object-affected harmful factors
If the cover is designed without openings to maintain insulation distance, then dielectric strength is improved for high-voltage operation, but the cover cannot be securely mounted on the electrical insulator assembly
Solution Approach 1:
The patent segments the mounting function from the insulation function by providing multiple mounting mechanisms at different locations on the cover. The first mounting mechanism is positioned in the first region with openings, while the second mounting mechanism is positioned in the second region without openings, allowing secure mounting without compromising insulation.
3Device complexity
If a single mounting mechanism is used on the cover, then device complexity is reduced, but mounting reliability is insufficient for high-voltage applications
Solution Approach 1:
The patent merges multiple mounting mechanisms into a single integrated cover structure. The cover includes both a first mounting mechanism with claws engaging first engagement recesses and a second mounting mechanism with claws engaging second engagement recesses, combining multiple secure attachment points into one unified component without requiring separate mounting devices.
Data Source
AI summary
A motor includes a rotor and a stator having a tubular stator core and first and second electrical insulators on axially opposite ends of the stator core. The stator core includes a yoke and a plurality of radially inwardly extending teeth supporting winding parts of three phase stator windings and a cover mounted over the first electrical insulator. The cover includes a peripheral wall and a top wall, and the peripheral wall includes a locking finger having a radially outwardly extending claw that engages a locking surface of the first insulator assembly. The top wall of the cover at the location of the locking finger is imperforate.