Stator Coil Configuration for Electric Vehicle Charging Control
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Solution Overview
Problem
Rotating electrical machines used in electric vehicles face challenges in controlling currents in stator coils when connected to an electrical power supply, particularly during charging, due to mismatched temporal orders of currents and coil arrangements, which complicates the operation and control of the machine.
Innovation Solution
Configuring the stator coils such that the order of currents around the axis matches or inversely matches the order of the coils, with each coil receiving a specific current input from a complementary 'dual coil', ensuring balanced currents and a static magnetomotive force wave, allowing for effective control and reduced rotor movement during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the stator coils are arranged in a fixed order on the carcass, then the machine structure is simplified, but the control of currents becomes complex when connected to a power supply device
Solution Approach 1:
The patent applies inversion by reversing the traditional approach: instead of arranging coils to match current temporal order, the coils are arranged in a fixed spatial order on the carcass, and the connection to the power supply device is configured to provide currents in the correct temporal sequence. This decouples the spatial arrangement from the temporal current sequence, simplifying both the stator structure and the control system.
2Ease of operation
If the coils are connected to match the temporal order of currents, then current control is simplified, but the rotor experiences unnecessary movement during charging
Solution Approach 1:
The patent segments the connection configuration into two independent parts: the fixed spatial arrangement of coils on the carcass and the configurable connection to the power supply device. This segmentation allows the connection to be specifically configured for charging operations to produce balanced currents that eliminate rotor movement, while the coil arrangement remains simple and fixed.
3Productivity
If the stator is configured for optimal charging performance, then charging efficiency is improved, but the machine cannot be used for propulsion
Solution Approach 1:
The patent implements multi-functionality by designing a stator with a fixed coil arrangement that can operate effectively in both propulsion mode and charging mode. The universal design allows the same stator structure to serve dual purposes: driving the rotor during propulsion and enabling efficient battery charging when connected to a power supply device, eliminating the need for separate configurations.
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 simplifies the control of currents, reduces rotor movement, and enables efficient charging without decoupling the rotor or applying brakes, enhancing the operational performance of the rotating electrical machine.
Implementation Method 1
electrical conductors forming the coils of the stator are wound... current flowing through each coil... static magnetomotive force wave
Data Source
Figure 1~2
Figure 3~4
AI summary
The method involves providing a stator (2) having a yoke (5) on which electrical conductors are wound so as to form coils (6-1-6-6). The coils are connected to a power supply device e.g. power grid, so that each coil is crossed by electric current (i2) delivered by the device. The stator is connected to the device, so that a phase shift between another electric current (i1) traversing one of the coils i.e. reference coil, and the former current at other coils varies in a strictly monotonous way as displacement of the reference coil when the reference coil is moved around a stator axle (X). Independent claims are also included for the following: (1) a method for charging a battery from a power supply device (2) a system comprising a stator and a power supply device.