Unified Resolver and Inductive Rotor Supply Magnetic Circuit
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Solution Overview
Problem
Existing electrical machines require separate components for contactless energy transmission and angular position measurement, leading to increased installation space, complexity, and costs, as well as wear-related issues with conventional brush-based systems.
Innovation Solution
A device that integrates inductive energy transmission and angular position detection using a single primary coil on the stator and secondary coils on the rotor, where the primary coil functions for both energy transfer and position measurement, allowing simultaneous energy supply and position determination without wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components are used for contactless energy transmission and angular position measurement, then each component can be optimized independently, but the installation space, complexity, and costs increase
Solution Approach 1:
The patent combines the energy transmission coils and position measurement coils into a single integrated stator winding structure. The stator produces both the magnetic field for contactless energy transmission to the rotor and the magnetic field for resolver-based angular position detection, eliminating the need for separate components and reducing overall system complexity
Solution Approach 2:
The stator windings serve multiple functions simultaneously: they provide contactless energy transmission to the rotor and enable angular position measurement through resolver functionality. This multi-functionality reduces the number of components needed while maintaining independent optimization capabilities for each function
2Reliability
If separate components are used for contactless energy transmission and angular position measurement, then functional performance is maintained, but installation space and costs increase
Solution Approach 1:
The patent merges the energy transmission and position measurement functions into a single stator structure, significantly reducing the installation space required in the stator. The integrated design eliminates redundant components and allows both functions to share the same magnetic circuit and physical space
3Device complexity
If conventional brush-based energy transmission is used, then structural simplicity is maintained, but wear and maintenance requirements increase
Solution Approach 1:
The patent replaces the mechanical brush-based contact system with a contactless inductive energy transmission system. The stator windings generate a magnetic field that induces current in rotor windings, eliminating mechanical contact and associated wear, while maintaining the essential function of power transmission to the rotor
4Device complexity
If integrated design is used for energy transmission and position measurement, then installation space and complexity are reduced, but component design becomes more challenging
Solution Approach 1:
The patent applies local quality by creating distinct winding regions within the stator: one region optimized for energy transmission to the rotor and another region optimized for position measurement. This allows each functional region to be designed and manufactured with appropriate characteristics while being part of an integrated structure
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 integration reduces installation space, complexity, and costs, while eliminating wear-related issues, enabling efficient and reliable contactless energy transfer and position measurement in electrical machines.
Implementation Method 1
at least one primary coil (12), in particular located on the stator side, for measuring the angular position of the rotor or the angle of rotation and/or for inductive transfer of electrical energy to a consumer on the rotor
Implementation Method 2
The secondary coil is permeated by the primary coil with the alternating magnetic field, which induces an alternating voltage in the secondary coil
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The invention relates to a device for the contactless transmission of electrical energy to a load arranged on a rotor 20 of an electric machine and for detecting the angular position of the rotor 20. The device comprises an inductive energy transfer path for the inductive transmission of electrical energy to the electrical load and a resolver for detecting the angular position of the rotor 20, wherein the inductive energy transfer path and the resolver utilize a magnetic circuit. The invention further relates to a corresponding method and a corresponding electric machine.