Method and device for inductively heating a stator or armature of an electric machine
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Solution Overview
Problem
Current methods for heating stators or armatures of electric machines during impregnation are inefficient, leading to prolonged production times and increased energy costs due to indirect heating and temperature control challenges, especially when dealing with components of varying electrical conductivities.
Innovation Solution
An inductively-operating heating device that uses electromagnetic fields of different frequencies to heat components uniformly and efficiently, with the option of simultaneous or sequential application of medium-frequency and high-frequency fields, and coaxial or axial movement of the inductor to ensure thorough heating and temperature maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If indirect heating methods are used for stators or armatures, then the heating process can be implemented with simple equipment, but the heating efficiency is low and production time is prolonged
Solution Approach 1:
The patent replaces indirect mechanical heating methods with direct inductive heating using electromagnetic fields. The inductive heating device generates electromagnetic fields that directly induce eddy currents in the conductive components (stator or armature), converting electrical energy to thermal energy efficiently without requiring complex heating mechanisms or prolonged contact time.
Solution Approach 2:
The patent utilizes the electrical conductivity parameter of the stator or armature components to enable selective inductive heating. By applying electromagnetic fields at appropriate frequencies, the system exploits the conductive properties of the metal components to generate heat directly within them, transforming the heating approach from external thermal transfer to internal electromagnetic energy conversion.
2Manufacturing precision
If uniform heating of all components is achieved, then the impregnation quality is improved, but the energy consumption and process time increase
Solution Approach 1:
The patent applies inductive heating selectively to specific components (stator or armature) based on their local electrical conductivity properties. The electromagnetic fields are configured to target conductive regions directly, inducing eddy currents and generating heat only where needed, rather than heating the entire assembly uniformly. This localized approach achieves sufficient thermal distribution for impregnation while minimizing overall energy consumption.
3Productivity
If inductive heating with electromagnetic fields is used, then heating speed and uniformity are improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical heating systems with an inductive heating device that uses electromagnetic fields. This substitution simplifies the overall system by eliminating the need for direct thermal contact mechanisms, temperature sensors, and complex control systems required for uniform heating, while achieving faster and more uniform heating through electromagnetic energy direct coupling.
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 approach allows for faster and more uniform heating of all components, reducing the impregnation process duration and manufacturing costs by optimizing heat penetration and distribution across varying materials.
Implementation Method 1
a device for heating the stator or armature, having at least one electromagnetic inductor by means of which the stator or armature can be inductively heated
Implementation Method 2
the inductive heating takes place by means of electromagnetic fields of different frequency
Data Source
AI summary
The invention relates to a method and a heating device (1c) for inductively heating a stator (2) or armature (3) of an electric machine, in particular before and during trickle impregnation thereof. In addition, the invention relates to an impregnating device (50) in which this heating device (1c) is integrated. According to the invention, it is provided that the heating takes place inductively by electromagnetic fields of different frequencies. For this purpose, it is provided in the case of the heating device (1c) that it has at least one electromagnetic inductor (18, 21, 24) which is disposed coaxially or axially parallel with respect to the longitudinal axis (7) of the stator (2) or armature (3) and which inductively heats said stator or armature, and that the at least one inductor (18, 21, 24) is designed to generate at least two electromagnetic fields of different frequencies.