Inductive Synchronous Machine Demagnetizing Circuit for Fault Response
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Solution Overview
Problem
Conventional inductively electrically excited synchronous machines face challenges in quickly demagnetizing the rotor coil without overheating during machine faults, leading to potential thermal overload and prolonged reaction times.
Innovation Solution
Incorporating a stator-side demagnetizing circuit with dynamo windings on the stator, which induces voltage from the rotor field to dissipate energy externally, allowing for rapid demagnetization and avoiding additional heat input to electronic components, controlled by the machine controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotor-side braking circuit is used to demagnetize the rotor coil during machine faults, then the rotor coil can be demagnetized, but the reaction time is large and thermal overload of electronic components occurs
Solution Approach 1:
Instead of using a rotor-side braking circuit that dissipates energy within the rotor, the patent inverts the approach by using a stator-side demagnetizing circuit with dynamo windings that inductively transfer energy from the rotor to the stator, where it can be dissipated externally without delaying the demagnetization process
Solution Approach 2:
The patent introduces a stator-side demagnetizing circuit as an intermediary system between the rotor coil and the external environment. This circuit includes dynamo windings on the stator that couple inductively with the rotor coil, allowing energy transfer and dissipation without direct rotor-side electronic components, thus reducing reaction time and avoiding thermal overload
2Reliability
If a rotor-side braking circuit is used to demagnetize the rotor coil during machine faults, then the rotor coil can be demagnetized, but thermal overload of electronic components occurs
Solution Approach 1:
The patent extracts the demagnetization function from the rotor side to the stator side. By placing the demagnetizing circuit with dynamo windings on the stator, the energy dissipation occurs outside the rotor, removing the thermal stress from rotor-side electronic components while maintaining effective demagnetization capability
Solution Approach 2:
The stator-side demagnetizing circuit acts as an intermediary that transfers energy from the rotor coil through inductive coupling via dynamo windings. This intermediary system allows energy dissipation in the stator where cooling is more effective, preventing thermal overload of rotor electronic components
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
Enables quick and efficient demagnetization of the rotor coil during faults, reducing the risk of thermal overload and improving response times by dissipating energy externally, thus protecting the synchronous machine from overheating.
Implementation Method 1
The machine controller (4) is designed in such a way that it demagnetizes the respective rotor coil (5) in the event of a machine fault of the synchronous machine (1). For this purpose, at least one dynamo winding (16) is provided on the stator (3)
Implementation Method 2
The rotor (2) has at least one rotor coil (5) for generating a magnetic rotor field
Data Source
AI summary
An inductively electrically excited synchronous machine is disclosed. The synchronous machine includes a rotor including at least one rotor coil for generating a magnetic rotor field, a stator, on which the rotor is rotatably mounted about an axis of rotation, and including at least one stator coil for generating a magnetic stator field, and a rotary transformer for inductively transmitting electrical energy to the at least one rotor coil. The rotary transforming includes at least one stator-fixed transformer primary coil and at least one rotor-fixed transformer secondary coil. A machine controller is coupled to the stator coil and to the at transformer primary coil for operation as a motor and/or as a generator. A demagnetizing circuit is provided that includes at least one dynamo winding arranged on the stator. The demagnetizing circuit has at least one switching device for activating and deactivating the demagnetizing circuit.