Motor Winding Backup Control for Communication Fault Stability
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Solution Overview
Problem
Existing motor control devices require dedicated storage areas and complex configurations to handle communication abnormalities between control units, leading to increased complexity and potential motor torque issues during communication disruptions.
Innovation Solution
A motor control device with a master and slave control unit configuration, where the slave unit generates backup control command values using information from alternative paths, reducing the need for dedicated storage and minimizing communication-related abnormalities, and allowing for stable motor torque maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated storage areas are provided to hold backup control command values during communication abnormalities, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the backup control command value storage function with the normal operation storage area. The same storage area in the slave control unit is used for both holding control command values during normal communication and during communication abnormalities, eliminating the need for separate dedicated storage areas while maintaining reliability.
Solution Approach 2:
The storage area in the slave control unit is designed to serve multiple functions: it stores control command values received from the master control unit during normal operation, and automatically retains these values for backup control when communication abnormalities occur. This multi-functional design reduces device complexity while ensuring control stability.
2Measurement precision
If control command values are updated frequently through communication between control units, then control precision is improved, but vulnerability to communication abnormalities increases
Solution Approach 1:
The slave control unit is pre-configured with the capability to retain control command values in its storage area. When communication abnormalities are detected, the slave control unit can immediately switch to using these retained values for backup control, preventing control instability without requiring frequent updates or complex error handling protocols.
Solution Approach 2:
The system implements a feedback mechanism where the slave control unit continuously monitors communication status between control units. When communication abnormalities are detected, the slave control unit automatically transitions to backup control mode using retained values, and when communication is restored, it resumes normal control command updates, ensuring both precision and reliability.
Data Source
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AI summary
A motor control device includes a plurality of control units corresponding to a plurality of windings (14, 15) which is provided in a motor (12). The plurality of control units includes a master control unit (20), a slave control unit (30), and at least one abnormality monitoring unit (53, 62, 64). The slave control unit (30) is configured to generate a power supply control command value using information which is acquired through a path other than communication between the control units and which is held for use in control of supply of electric power to the windings (14, 15) in a normal state in which an abnormality in communication between the control units is not detected and to perform backup control for holding the power supply control command value until the abnormality monitoring unit (53, 62, 64) fixes an abnormality in communication between the control units after detecting the abnormality in communication.