Motor Winding Control Synchronization to Prevent Overcurrent
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Solution Overview
Problem
Existing rotary electric machine control devices face issues with overcurrent due to misalignment in control units when coordinating multiple systems, particularly when one control unit fails to perform instruction calculations in time, leading to imbalanced current sums and differences.
Innovation Solution
A rotary electric machine control device with multiple control units, including a main and sub-control unit, coordinates energization control by sharing electric current instruction values, performing feedback control using current sums and differences, and limiting feedback control amounts to prevent overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple control units perform independent instruction calculations, then control flexibility and parallel processing capability are improved, but current misalignment and overcurrent occur due to lack of synchronization
Solution Approach 1:
The patent introduces a main control unit as an intermediary that centralizes instruction value calculation and distributes it to sub-control units. This mediator role ensures all control units use synchronized instruction values, preventing current misalignment while maintaining the parallel processing structure of multiple control units.
Solution Approach 2:
The patent merges the instruction value calculation function into a single main control unit, while sub-control units focus on execution. This functional merging eliminates redundancy in calculation logic and ensures all units operate from the same instruction values, resolving the synchronization issue.
2Speed
If one control unit fails to perform instruction calculations in time, then response speed is improved for other units, but current sum and difference become unbalanced causing overcurrent
Solution Approach 1:
The patent implements feedback control where control units monitor current sums and differences, and adjust their operation based on this feedback. When imbalance is detected, the system corrects the instruction values to prevent overcurrent, allowing individual units to operate at different speeds without causing harmful effects.
Solution Approach 2:
The patent prepares compensatory measures in advance by establishing feedback mechanisms that detect and correct current imbalances before they lead to overcurrent conditions. This cushioning approach allows the system to tolerate timing variations in instruction calculation.
3Adaptability or versatility
If control units use different electric current instruction values, then individual optimization is improved, but coordinated control deteriorates leading to system instability
Solution Approach 1:
The patent segments control functions into instruction value calculation (main control unit) and execution (sub-control units). This segmentation allows the main unit to maintain centralized coordination for stability while sub-units can optimize their local execution, achieving both individual optimization and system stability.
Data Source
AI summary
A rotary electric machine control device is configured to drive a rotary electric machine including multiple motor windings. The rotary electric machine control device includes a main control unit and a sub-control unit provided for respective motor windings and mutually-communicable to perform a coordinated drive control by sharing at least one parameter to perform energization control. Each of the main control unit and the sub-control unit calculates a voltage instruction value of a voltage to be applied to the motor winding based on an electric current detection value and an electric current instruction value, and perform the energization control of the motor winding based on the voltage instruction value. The sub-control unit performs the energization control by using the electric current instruction value that has been transmitted from the main control unit. The main control unit performs the energization control by using the same electric current instruction value.