Salient Pole Rotor Field Winding Support via Insulated Push-Up
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Solution Overview
Problem
The use of electrical insulation plates on the undersurfaces of field windings in salient-pole rotary electric machines hinders ventilation cooling, leading to heat generation, and existing support methods fail to ensure a safe electrical insulation creepage distance, especially when these plates are abolished.
Innovation Solution
A field winding support member comprising a coil support body made of electrical insulation material with abutment surfaces and an insertion hole, a bolt fixed to the rotor yoke, and an elastic body that presses the coil support body toward the field windings, ensuring a secure creepage distance through a spot-faced part with a larger diameter than the insertion hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical insulation plates are disposed on the undersurfaces of field windings, then electrical insulation is improved, but ventilation cooling is hindered causing heat generation
Solution Approach 1:
The patent removes the electrical insulation plates from between the field windings and rotor core, extracting the harmful insulating barrier that blocked cooling while maintaining electrical insulation through alternative means (insulated push-up device and creepage distance design)
Solution Approach 2:
The patent introduces an insulated push-up device as an intermediary component that provides mechanical support while maintaining electrical insulation through its insulating material construction, replacing the dual-function insulation plates
2Temperature
If electrical insulation plates are abolished and push-up device directly supports field windings, then ventilation cooling is improved, but electrical insulation creepage distance cannot be secured
Solution Approach 1:
The insulated push-up device acts as an intermediary between the metallic support structure and field windings, providing the necessary creepage distance through its insulating material while allowing direct mechanical support
Solution Approach 2:
The patent transitions from relying on radial insulation (insulation plates) to utilizing axial insulation (insulated push-up device length), changing the dimensional approach to achieving creepage distance
3Temperature
If insulated push-up device is used without electrical insulation plates, then ventilation cooling is improved, but device complexity increases
Solution Approach 1:
The patent merges the mechanical support function and electrical insulation function into a single integrated push-up device component, eliminating the need for separate insulation plates and reducing overall complexity
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 solution effectively supports rotor field windings while maintaining a desirable electrical insulation creepage distance, even without electrical insulation plates, thereby addressing heat generation and safety concerns.
Implementation Method 1
an elastic body that is interposed between the rotor yoke and the coil support body part and presses the coil support body part toward the field windings
Data Source
AI summary
A coil support (28) is configured to include a coil support body part (281) that is made of resin and that has abutment surfaces (281c, 281d) to be in respective direct abutments with radial inner surfaces of adjoining field windings (24) and an insertion hole (281a) that is formed along a radial direction of a rotary shaft (21), a bolt (282) with a hexagonal hole that has a base end part fixed to a rotor yoke (22) and a tip end part projecting outward in a radial direction and that is inserted into the insertion hole (281a) of the coil support body part (281), and a disc spring (283) that is interposed between the rotor yoke (22) and the coil support body part (281) and that presses the coil support body part (281) toward the field windings (24), and to have a spot-faced part (281b) that is formed on a radial outside of the insertion hole (281a) to have a larger diameter than the insertion hole (281a).