Wireless Excitation Transformer Detection Without Rotor Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless excitation systems for electric vehicle motors face challenges in accurately detecting electrical parameters due to parameter deviations and installation errors, making fault detection inconvenient and costly, and existing solutions are complex and unreliable in high-speed, high-temperature environments.
Innovation Solution
A wireless excitation system that injects current excitations into the stator winding of an electrical excitation motor to alter the load characteristic of the excitation transformer, using response signals from the primary side to determine electrical parameters by short-circuiting and open-circuiting the secondary side, allowing for fault detection without additional hardware on the rotor side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical parameters are detected using conventional methods in wireless excitation systems, then parameter deviations and installation errors can be identified, but the detection system becomes complex and unreliable in high-speed, high-temperature environments
Solution Approach 1:
The patent extracts the detection function from the rotor side to the stator side by detecting the electrical parameters of the excitation transformer through the primary side only. This eliminates the need for additional detection hardware on the rotor, simplifying the overall system while maintaining detection accuracy through signal injection and response analysis methods
Solution Approach 2:
The existing power conversion circuits and controllers are made multi-functional by enabling them to perform both motor control and parameter detection functions. The first controller controls current injection for detection, while the second controller processes response signals, allowing the same hardware to serve dual purposes without adding dedicated detection equipment
2Measurement precision
If additional detection hardware is added to the rotor side to detect electrical parameters, then detection accuracy improves, but system complexity and cost increase
Solution Approach 1:
The detection function is extracted from the rotor side to the stator side, eliminating the need for additional detection hardware on the rotor. This simplifies installation and maintenance while maintaining detection accuracy through alternative detection methods using existing components
Solution Approach 2:
The system uses its own existing power conversion circuits and controllers to perform detection functions. The first controller and second controller work together to inject test currents and analyze response signals, allowing the system to self-diagnose without external detection equipment
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
Accurately detects electrical parameters of the excitation transformer, reducing costs and improving reliability by eliminating the need for complex circuits on the rotor side and enabling efficient fault detection.
Implementation Method 1
The excitation transformer is configured to transmit energy required by an excitation winding of the electrical excitation motor from a stator to a rotor
Implementation Method 2
The excitation rectifier circuit is configured to convert an alternating current received by a secondary side of the excitation transformer into a direct current and then transmit the direct current to the excitation winding
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This application discloses a wireless excitation system, a detection method, and an electric vehicle; and relates to the field of electronic and electric technologies. An input end of a first power conversion circuit of the system is connected to a power supply, and an output end of the first power conversion circuit is connected to a stator winding of an electrical excitation motor. An input end of a second power conversion circuit is connected to the power supply, and an output end of the second power conversion circuit is connected to a primary side of an excitation transformer. The excitation transformer transmits energy required by an excitation winding of the electrical excitation motor from a stator to a rotor. A first controller controls the first power conversion circuit to inject a current excitation into the stator winding, so that a current is generated on the excitation winding. A detection circuit obtains a response signal of the primary side of the excitation transformer and sends the response signal to a second controller. When the current generated on the excitation winding causes the secondary side of the excitation transformer to be short-circuited, and when the current generated on the excitation winding causes the secondary side of the excitation transformer to be open-circuited, the second controller controls the second power conversion circuit to inject a pulse current excitation into the primary side of the excitation transformer, and determines an electrical parameter of the excitation transformer by using the response signal. An electrical parameter of the wireless excitation system can be detected by using this system.