Rotor Core Heating Shield Plate Layout to Prevent Local Overheating
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Solution Overview
Problem
In induction-heating devices for rotor cores, manufacturing variations can lead to non-uniform contact between magnetic flux shielding jigs and the rotor core, causing localized overheating due to magnetic flux concentration.
Innovation Solution
The use of magnetic flux shielding plates with protruding inner regions that contact the rotor core's central hole area, reducing gaps and enhancing contact, and optionally supported by a pressing device to ensure closer adhesion and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If magnetic flux shielding jigs are configured to contact the entire axial end faces of the rotor core, then complete coverage is achieved, but manufacturing variations cause non-uniform contact and local overheating
Solution Approach 1:
The magnetic flux shielding plate is designed with different regions having different contact characteristics: a first contact region that contacts the rotor core and a second contact region that does not contact the rotor core. This local differentiation allows the plate to ensure adequate contact area while accommodating manufacturing variations, preventing both excessive and insufficient contact in different locations.
2Area of stationary object
If magnetic flux shielding jigs contact the entire axial end faces, then full coverage is achieved, but gaps around through holes cause magnetic flux concentration and local overheating
Solution Approach 1:
The magnetic flux shielding plate differentiates between contact and non-contact regions, with the first contact region positioned to prevent gaps around through holes. This local quality approach ensures that critical areas prone to magnetic flux concentration are properly shielded while maintaining overall shielding coverage.
Solution Approach 2:
The magnetic flux shielding plate acts as an intermediary component between the rotor core and the heating coil, mediating the magnetic flux distribution. By strategically designing which regions contact the rotor core, it prevents direct magnetic flux concentration at problematic locations while maintaining overall shielding function.
3Object-affected harmful factors
If magnetic flux shielding plates with selective contact regions are used, then local overheating is prevented, but device complexity increases
Solution Approach 1:
The magnetic flux shielding plate incorporates a simple geometric differentiation between contact and non-contact regions rather than complex mechanisms. This approach prevents local overheating through strategic regional design while maintaining manufacturing simplicity and avoiding excessive device 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 configuration prevents local overheating of the rotor core by ensuring uniform contact and reducing maximum temperature and strain on non-magnetic plates, while maintaining the same performance as conventional heating devices.
Implementation Method 1
a heating device configured to induction-heat a rotor core (10) of an electric motor
Implementation Method 2
induction-heating a rotor core (10)
Implementation Method 3
a first magnetic flux shielding plate (20A) located on the first end face (10A) of the rotor core (10)
Data Source
AI summary
A heating device for induction-heating a rotor core of an electric motor includes an induction heating coil disposed in a central hole of the rotor core, an alternating current power supply for supplying an alternating current to the induction heating coil, and a first magnetic flux shielding plate disposed on a first end face of the rotor core and having a first opposing surface opposed to the first end face of the rotor core. The first opposing surface of the first magnetic flux shielding plate has a first inner region and a first outer region located radially outward of the first inner region. The first inner region protrudes more toward the first end face than the first outer region. Clearance is formed between the first outer region and the first end face of the rotor core when the first inner region abuts the first end face of the rotor core.