Interconnectable Rotor Coil Units for Variable Winding Efficiency
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Solution Overview
Problem
Electrically excited drive machines for motor vehicles face inefficiencies due to losses dependent on electric resistance, which are not optimized at every operating point.
Innovation Solution
A rotor design for electrically excited drive machines featuring multiple coil units per pole, with an interconnecting device that adjusts the number of windings based on the operating point, allowing for efficient configuration of the rotor winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of windings is increased to provide necessary torque and power output, then the power output is improved, but the electric resistance losses increase and efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the number of windings adjustable rather than fixed. The rotor winding system can dynamically change the number of effective windings based on operating conditions through the interconnecting device that selectively connects coil units in series or parallel, allowing optimization between power output and efficiency at different operating points
Solution Approach 2:
The patent changes the electrical parameter of winding number to optimize performance. By varying the number of windings through different connection configurations (series/parallel) of multiple coil units, the system adapts to different operating requirements, reducing energy losses while maintaining necessary power output
2Force
If the number of windings is increased to provide necessary torque, then the torque is improved, but the electric resistance losses increase and efficiency decreases
Solution Approach 1:
The system dynamically adjusts the winding configuration based on torque requirements. The interconnecting device enables real-time reconfiguration of coil units between series and parallel connections, allowing the rotor winding to provide optimal torque while minimizing resistive losses at different operating conditions
Solution Approach 2:
The patent varies the winding number parameter to optimize torque production. By selectively connecting multiple coil units in different configurations, the system achieves the necessary torque output while reducing energy losses through optimized electrical resistance at each operating point
3Adaptability or versatility
If multiple coil units are added per pole to enable winding configuration variation, then the adaptability to different operating points is improved, but the device complexity increases
Solution Approach 1:
The rotor winding is segmented into multiple independent coil units per pole, each with predetermined windings. This segmentation allows flexible reconfiguration through the interconnecting device, enabling adaptability to different operating points while managing complexity through modular, standardized units that can be systematically connected
Solution Approach 2:
Multiple coil units are designed with universal characteristics, each having predetermined windings and standardized connection interfaces. This multi-functionality allows the same coil unit design to serve different purposes by changing connection configurations, achieving adaptability without proportionally increasing design complexity
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 design improves the efficiency of electric drive machines by optimizing the number of windings at different operating points, particularly reducing hysteresis losses.
Implementation Method 1
electrically excited drive machine without permanent magnets which have a stationary stator with an energizable stator winding, and a rotor which is mounted rotatably with regard to the stator and has an energizable rotor winding
Data Source
AI summary
A rotor for an electrically excited drive machine includes: a coil per rotor pole with, in each case, one first energizable coil unit, and a rotor core for holding the coils of the rotor poles. The coils have, in each case, at least one second energizable coil unit per rotor pole. The rotor has an interconnecting unit which is designed to interconnect the at least two coil units per coil in a manner which is dependent on an operating point of the electric drive machine in order to set the number of windings of the coil, and in order to electrically connect the coils of the rotor poles for configuring a rotor winding with an overall number of windings which is dependent on the numbers of windings of the coils.