Reconfigurable Synchronous Machine With Series-Parallel Windings
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Solution Overview
Problem
Conventional winding reconfiguration methods for synchronous machines require numerous contactors or switches, increasing system size, weight, and potentially decreasing reliability, while failing to efficiently accommodate varying power and torque demands and battery voltage changes.
Innovation Solution
A synchronous machine design with a first and second set of n-phase windings, each set offset by 180 degrees, using three two-pole switches and inverter circuitry to switch between parallel and series configurations, reducing the number of switches required and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional winding reconfiguration methods are used, then the machine can adjust parameters for different operating conditions, but the number of contactors or switches increases system size and weight
Solution Approach 1:
The patent merges the functions of multiple switches into a single three-position switch that can simultaneously configure both sets of windings (first and second n-phase windings) between series and parallel connections. This consolidation reduces the number of individual contactors and switches needed, directly addressing the weight reduction goal while maintaining full reconfiguration capability.
Solution Approach 2:
The three-position switch serves multiple functions: it can switch the first set of windings between series and parallel connections, switch the second set of windings between series and parallel connections, and coordinate both switching operations simultaneously. This multi-functionality eliminates the need for separate switches for each winding set, reducing overall system weight while preserving adaptability.
2Adaptability or versatility
If conventional winding reconfiguration methods are used, then the machine can adjust parameters for different operating conditions, but the number of contactors or switches increases device complexity
Solution Approach 1:
The patent combines multiple switching functions into a single three-position switch mechanism. Instead of using separate contactors for each winding set and connection type, one unified switch performs all configuration tasks, significantly reducing device complexity while maintaining the ability to adjust parameters for different operating conditions.
Solution Approach 2:
The three-position switch is designed with universal functionality to handle both winding sets simultaneously. Each position of the switch corresponds to a specific configuration state for both the first and second sets of n-phase windings, eliminating the need for multiple independent switching devices and simplifying the overall control architecture.
3Adaptability or versatility
If more switches are used for reconfiguration, then the machine can accommodate varying power and torque demands, but reliability decreases
Solution Approach 1:
By merging multiple switching functions into a single three-position switch, the patent reduces the total number of potential failure points in the system. Fewer individual contactors and switches mean fewer components that could fail, thereby improving reliability while still accommodating varying power and torque demands through the switch's multiple positions.
Solution Approach 2:
The universal three-position switch handles all reconfiguration needs for both winding sets, reducing reliance on multiple specialized switches. This consolidation improves reliability by minimizing the number of critical components while maintaining the ability to adapt to different operating conditions through coordinated switching of both winding sets.
Data Source
AI summary
A synchronous machine includes a first set of windings, including a first winding and n−1 other windings. The synchronous machine also includes a second set of windings, including a first winding and n−1 other windings. The synchronous machine further includes first inverter circuitry electrically coupled to a second end of each of the n−1 other windings of the first set, a first switch electrically coupled between the first inverter circuitry and a second end of the first winding of the first set, second inverter circuitry electrically coupled to a second end of each of the n−1 other windings of the second set, and a second switch electrically coupled between the second inverter circuitry and a second end of the first winding of the second set. In addition, the synchronous machine includes a third switch electrically coupled between the second ends of the first windings and control circuitry configured to switch the machine between parallel and series configurations.