Series-Interconnected Six-Phase Motor Control for Fault Resilience
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Solution Overview
Problem
Existing systems for controlling polyphase motors are not adequately robust to both open-circuit and short-circuit failures, particularly for six-phase motors, leading to inefficiencies and increased costs due to electrical losses.
Innovation Solution
A device comprising two six-phase motors interconnected in series with independent power sources and inverters, allowing for independent control of each motor through Id and Iq current components, with redundant power and inverter configurations to manage failures without additional neutral point creation or fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If series redundancy of inverter electronic switches is implemented to protect against short-circuit failures, then reliability is improved, but electrical losses and cost increase due to doubled switches
Solution Approach 1:
The invention divides the six-phase motor into two independent three-phase motors, each controlled by its own inverter. This segmentation allows each inverter to operate independently with only three switches per inverter, avoiding the need for series redundancy (six switches) that would be required to protect a single six-phase inverter against short-circuit failures. The segmentation thus maintains reliability while reducing electrical losses.
2Reliability
If duplication of inverter with separate power sources is implemented to protect against short-circuit failure, then reliability is improved, but cost and complexity increase
Solution Approach 1:
The invention segments the six-phase motor control into two independent three-phase motor controls, each with its own inverter and power source. This segmentation naturally provides redundancy against short-circuit failures while maintaining manageable complexity through standardized inverter designs.
Solution Approach 2:
The invention uses universal three-phase inverters and three-phase motor control techniques for both six-phase motors, leveraging existing proven technology rather than requiring specialized six-phase inverters. This universality reduces device complexity while maintaining reliability.
3Reliability
If additional phase is added to make inverter robust to open-circuit failure, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention segments the six-phase motor into two independent three-phase motors, each with its own inverter. This segmentation provides inherent robustness to open-circuit failures because each three-phase inverter-motor pair can operate independently. If one phase fails in one three-phase motor, the other three-phase motor remains fully operational, and the failed three-phase motor can still operate in reduced capacity.
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 simultaneous independent control of two six-phase motors with reduced costs and minimized electrical losses, maintaining operational reliability in the event of open-circuit and short-circuit failures.
Implementation Method 1
The two six-phase motors are interconnected in series, with two-by-two connections of respective successive branches, said connections being alternately in phase and in phase opposition
Data Source
Figure 1~3
Figure 2
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AI summary
The control device for two polyphase motors comprises a first and a second six-phase motors (MH1, MH2) with six branches corresponding to six spatially uniformly distributed phases, interconnected in series, and said series interconnection of the two six-phase motors (MH1, MH2) comprising pairwise connections of successive respective branches of the two six-phase motors (MH1, MH2), said connections being alternately in phase and in opposite phase.