AC Motor Open-Circuit Fault Control With Rotor-Angle Current Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fault-tolerant control methods for open-circuit faults in three-phase alternating current motors require hardware modifications, increasing costs and system complexity, and often suffer from limited speed range, complex control strategies, low control accuracy, and reduced torque output capability.
Innovation Solution
A fault-tolerant control method and apparatus that constructs an optimization model considering quadrature-axis and direct-axis currents with the motor rotor electrical angle, determining phase current references using cost and limiting equations, without modifying the hardware circuit, to manage open-circuit faults in alternating current motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardware circuit modifications are made to achieve fault-tolerant control, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces hardware circuit modifications with a software-based control method. By using an optimization model with cost equations and limiting conditions to determine phase current references, the system achieves fault-tolerant control without any physical circuit changes, thereby maintaining reliability while reducing device complexity and cost.
Solution Approach 2:
The patent changes control parameters (phase current references) dynamically based on fault detection and optimization calculations. By adjusting electrical parameters through software rather than modifying hardware circuits, the system achieves adaptability to faults while keeping the hardware structure simple and cost-effective.
2Device complexity
If existing fault-tolerant control methods are used without hardware modification, then device complexity is reduced, but torque output capability and control accuracy deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of phase current references through an optimization model that continuously calculates optimal current values based on limiting conditions. This dynamic control approach maintains torque output capability without hardware modifications by adapting control parameters in real-time according to system constraints.
Solution Approach 2:
The patent uses feedback from fault detection and system state monitoring to adjust phase current references through the optimization model. By incorporating limiting conditions and cost equations that respond to actual system performance, the control system maintains high torque output capability while using only software-based fault tolerance.
3Reliability
If phase current references are adjusted to achieve fault-tolerant control, then reliability is improved, but copper consumption and efficiency worsen due to increased current peak values
Solution Approach 1:
The patent optimizes phase current reference parameters through an optimization model that explicitly considers limiting conditions. By carefully adjusting current parameters to satisfy constraints while maintaining torque requirements, the system achieves fault-tolerant operation with minimized current peak values, thereby reducing copper consumption and maintaining efficiency.
Data Source
Figure 1~2
Figure 3~4
AI summary
The present disclosure relates to the field of motor control, and in particular to a fault-tolerant control method and apparatus for an open-circuit fault in an alternating current motor, a computer device and a computer storage medium. The method comprises: A. constructing a fault-tolerant control optimization model, in consideration of a condition that quadrature-axis current and direct-axis current of a motor change along with a motor rotor electrical angle, wherein the fault-tolerant control optimization model comprises a cost equation generated based on a motor torque equation and a limiting condition consisting of one or more of a fault phase current equation, a motor phase current limiting equation, and a motor phase voltage limiting equation; and B. determining a phase current reference value at a current motor rotor electrical angle by using the fault-tolerant control optimization model.