Externally Excited Synchronous Machine Rotor Demagnetization Circuit
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Solution Overview
Problem
Existing externally excited electric synchronous machines face challenges in reliably demagnetizing the machine rotor coil, particularly in scenarios of defects or overvoltage, which can lead to energy storage issues and increased complexity in design and installation.
Innovation Solution
A protection circuit is employed in parallel with the rectifier circuit and machine rotor coil, featuring a switch that disconnects the rotor coil from the rectifier circuit for demagnetization, allowing the protection circuit to consume stored energy and simplify the demagnetization process, while also protecting the rectifier circuit from overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate demagnetization circuit is added to the protection circuit, then the demagnetization function is improved, but the device complexity increases
Solution Approach 1:
The protection circuit is designed to serve dual functions: overvoltage protection and demagnetization. By integrating the demagnetization capability into the existing protection circuit structure, the patent eliminates the need for a separate demagnetization circuit, thereby reducing device complexity while maintaining reliable demagnetization function. The switch and energy consumption path are shared between both functions.
2Reliability
If additional components are added for demagnetization, then the demagnetization capability is improved, but the installation space increases
Solution Approach 1:
The patent merges the demagnetization components with the protection circuit components. The switch, energy consumption path, and control logic are combined into the existing protection circuit structure, eliminating redundant components and reducing the overall installation space required for both functions.
3Device complexity
If the protection circuit is used for both overvoltage protection and demagnetization, then the device complexity is reduced, but the overvoltage protection reliability may be compromised
Solution Approach 1:
The protection circuit is segmented into distinct functional paths: one for overvoltage protection and another for demagnetization. This segmentation allows each function to operate independently through its dedicated energy consumption path, ensuring that the dual-function design does not compromise the reliability of either function while maintaining circuit simplicity.
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 solution enables reliable and efficient demagnetization of the machine rotor coil with reduced component count and installation space, ensuring safe operation and simplified construction by using the protection circuit for both overvoltage protection and demagnetization.
Implementation Method 1
an AC voltage is induced in a secondary coil during the operation. The induced AC voltage is converted via a rectifier circuit into the required DC voltage
Implementation Method 2
the energy stored in the machine rotor coil is consumed during the demagnetization by means of the protection circuit
Data Source
AI summary
An externally excited electric synchronous machine may include a machine rotor, a rectifier circuit, a protection circuit, a switch, and a trigger circuit. The machine rotor may include a rotor shaft and a machine rotor coil non-rotatably arranged on the rotor shaft. The machine rotor coil may provide a magnetic rotor field during operation. The rectifier circuit may be configured to convert a transformer voltage into a DC voltage, which may be provided to the rotor coil. The protection circuit may be configured to protect the rectifier circuit from overvoltage and may be connected in parallel between the machine rotor and the rectifier circuit. The switch may be arranged between the rectifier circuit and the protection circuit. The trigger circuit may be connected to the switch and may be configured to open the switch for demagnetizing the machine rotor coil.