Multi-Phase Motor Control Apparatus for Reverse Force Handling
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Solution Overview
Problem
Existing control systems for multi-phase rotating electric machines face challenges in managing adverse effects such as increased phase currents and unstable responsiveness due to reverse external force inputs, which can lead to erroneous fault determinations and control fluctuations.
Innovation Solution
A control apparatus that includes an electric power converter, a command value calculator, and an input voltage determiner to assess and manage input voltage within normal operation ranges, ignoring or suppressing voltage and current changes caused by reverse external forces, and discontinuing overcurrent abnormality determinations when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If field-strengthening control is performed to reduce rotation angular speed when external force is input reversely, then mechanical impulsive force is suppressed, but phase currents increase and control stability deteriorates
Solution Approach 1:
The control apparatus applies preliminary anti-action by detecting reverse external force input through voltage monitoring and proactively switching to a special control mode before adverse effects fully manifest. The system predicts potential control instability and mechanical impulsive forces, and preemptively adjusts control parameters to prevent these issues while maintaining system reliability.
Solution Approach 2:
The control apparatus dynamically adjusts control parameters based on real-time voltage monitoring. When reverse external force is detected, the system transitions from normal control to a special control mode with modified parameters, and switches back when voltage returns to normal range. This dynamic adaptation resolves the contradiction by optimizing control stability while suppressing mechanical impulsive forces.
2Reliability
If phase current monitoring is performed for fault detection, then short-circuit faults can be identified, but reverse external force causes erroneous overcurrent fault determination
Solution Approach 1:
The control apparatus introduces an intermediary mechanism by using input voltage as an additional diagnostic parameter alongside phase current monitoring. The voltage information acts as a mediator to distinguish between genuine overcurrent faults and temporary current increases caused by reverse external force, thereby preventing erroneous fault determination while maintaining accurate fault detection capability.
Solution Approach 2:
The system implements feedback by continuously monitoring input voltage and using this information to modulate fault determination logic. When voltage exceeds the normal range, the system adjusts its interpretation of phase current measurements, preventing false overcurrent fault indications while maintaining sensitivity to actual faults. This feedback mechanism resolves the contradiction between fault detection accuracy and prevention of erroneous determination.
3Speed
If normal control is maintained during reverse external force input, then control responsiveness is preserved, but mechanical impulsive force and control fluctuation increase
Solution Approach 1:
The control apparatus dynamically switches between normal control and special control modes based on real-time voltage monitoring. When voltage remains within the normal range, normal control is maintained for optimal responsiveness. When voltage exceeds the normal range indicating reverse external force, the system transitions to special control with adjusted parameters to suppress control fluctuation and mechanical impulsive forces, then switches back when voltage returns to normal.
Solution Approach 2:
The system resolves the contradiction by changing control parameters dynamically. Normal control parameters are used during stable operation for responsive control. When reverse external force is detected through voltage monitoring, parameters are modified in the special control mode to reduce control fluctuation and mechanical impulsive forces, while maintaining adequate responsiveness. This parameter adaptation allows the system to optimize performance under different operating conditions.
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
Effectively suppresses adverse effects on control systems due to reverse external force inputs, preventing erroneous fault determinations and maintaining stable operation by managing input voltage and current fluctuations.
Implementation Method 1
The at least one electric power converter is configured to convert, through operation of a plurality of switching elements, DC power into multi-phase AC power and supply the multi-phase AC power to the rotating electric machine
Implementation Method 2
The rotating electric machine is configured to output torque to a load during normal operation of the rotating electric machine
Data Source
AI summary
A control apparatus for a multi-phase rotating electric machine includes at least one electric power converter, a command value calculator and an input voltage determiner. The at least one electric power converter converts DC power into multi-phase AC power and supplies the multi-phase AC power to the rotating electric machine. The command value calculator calculates command values for operating the at least one electric power converter. The input voltage determiner determines whether an input voltage of the at least one electric power converter is within a normal operation range. When the input voltage is determined by the input voltage determiner to be outside the normal operation range, the control apparatus switches control to ignore voltage change or current change caused by the reverse input of an external force to the rotating electric machine from a load side or suppress control fluctuation caused by the reverse input of the external force.