Synchronous Machine Exciter Winding Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The response behavior of drive devices with high inductance in the exciter winding is slow due to the lag in current build-up and dissipation, leading to delayed torque provision and poor performance in changing operating states.
Innovation Solution
Applying a voltage greater than the target voltage to the exciter winding using a voltage converter to rapidly build up and dissipate the exciter field, with the voltage being lowered to the target voltage after field establishment, and reversing polarity to further enhance speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a high inductance is used in the exciter winding to maintain stable operation, then the stability is improved, but the response behavior deteriorates due to slow current build-up and dissipation
Solution Approach 1:
The patent applies dynamic voltage control to the exciter winding, switching between different voltage levels (including negative voltage) based on the operational state. This dynamic approach allows the system to maintain stability during normal operation while achieving rapid response when needed, resolving the contradiction between stable operation and fast response behavior.
Solution Approach 2:
The patent changes the voltage parameter applied to the exciter winding from a constant positive value to a variable parameter that can take positive, zero, or negative values. This parameter change enables rapid current build-up and dissipation by overcoming the inductance effect, thereby improving response behavior while maintaining stability through controlled parameter transitions.
2Speed
If the voltage is increased to accelerate field build-up, then the response speed is improved, but the energy consumption increases
Solution Approach 1:
The patent employs periodic voltage application with specific timing - applying high voltage only during the transient phase when field build-up is needed, then switching to normal operating voltage. This periodic action pattern accelerates field build-up when necessary while minimizing energy consumption during steady-state operation, resolving the contradiction between speed and energy usage.
Solution Approach 2:
The patent maintains continuous control over the exciter winding voltage, ensuring that the field build-up process is optimized at every moment. By continuously adjusting the voltage based on the instantaneous state of the field, the system achieves rapid build-up without unnecessary energy waste, as the voltage is applied only when and where needed in the continuous operational cycle.
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 method improves the response behavior of the drive device by accelerating the build-up and breakdown of the exciter field, ensuring quicker torque provision and better responsiveness to operating state changes.
Implementation Method 1
an externally excited electrical synchronous machine for providing a drive torque and for generating an exciter field, an electrical voltage is applied to an exciter winding of the synchronous machine, wherein to build up the exciter field
Implementation Method 2
the drive device having an externally excited electrical synchronous machine for providing a drive torque and for generating an exciter field
Data Source
AI summary
The invention relates to a method for operating a drive device (1) for a motor vehicle. The drive device (1) has a separately excited electric synchronous machine (2) for providing a drive torque, and an electric voltage is applied to an excitation winding of the synchronous machine (2) in order to generate an excitation field. In order to generate the excitation field, the voltage applied to the excitation winding is selected so as to be temporarily greater than a target voltage and is lowered in the direction of the target voltage after the excitation field has been generated and/or the poles of the excitation winding are temporarily reversed in order to remove the excitation field. The invention additionally relates to a drive device (1) for a motor vehicle.