Motor Driving Device Miswiring Detection via Magnetic Pole Position
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Solution Overview
Problem
Existing multi-axis motor driving systems face challenges in preventing unintended motions due to miswiring between motors and encoders, which can lead to unstable operation and incorrect drive control, especially during the start-up of automatic machines with multiple servo-controlled axes.
Innovation Solution
The system employs a magnetic pole position detection unit to determine the actual motor position, allowing for feedback control and preventing unintended motions by comparing the magnetic pole position signal with encoder detection results, thereby securely identifying and addressing miswiring between axes and phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If encoder detection is used for motor control, then position feedback control is achieved, but miswiring between motor and encoder causes unintended motion and unstable operation
Solution Approach 1:
The patent introduces a magnetic pole position detection unit as an intermediary mechanism to verify the correctness of encoder wiring. This unit independently detects the magnetic pole position of the motor rotor, providing a reference value to compare against encoder detection results. By using this intermediary verification method, the system can identify miswiring conditions without compromising the primary encoder-based feedback control, thus resolving the contradiction between maintaining measurement precision and ensuring operational reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the magnetic pole position detection results are continuously compared with encoder detection results. When discrepancies are detected, the system generates warnings or error signals to indicate potential miswiring. This feedback loop allows the system to monitor wiring correctness in real-time and take corrective actions, thereby maintaining both position detection accuracy and operational stability.
2Reliability
If miswiring detection is performed by comparing detection results, then wiring correctness can be identified, but additional detection mechanisms increase device complexity
Solution Approach 1:
The magnetic pole position detection unit serves multiple functions: it detects the magnetic pole position for motor control, verifies encoder wiring correctness, and provides a reference for comparing against encoder detection results. By making this detection unit multi-functional, the patent reduces the need for separate dedicated verification mechanisms, thereby identifying wiring correctness without proportionally increasing device complexity.
Solution Approach 2:
The system uses its own magnetic pole position detection capability to verify the correctness of encoder wiring. Rather than requiring an entirely separate external verification system, the motor control device leverages its inherent detection functions to perform self-verification. This self-service approach enables wiring correctness identification while minimizing additional complexity.
3Measurement precision
If magnetic pole position detection is used for control, then feedback control is achieved, but determining actual motor position requires additional processing
Solution Approach 1:
The patent performs magnetic pole position detection as a preliminary action before executing the main motor control based on encoder feedback. By detecting the magnetic pole position in advance and comparing it with encoder detection results, the system establishes a reference framework that simplifies subsequent control processing. This preliminary detection and comparison process ensures accurate motor position determination without significantly increasing overall control complexity.
Data Source
AI summary
This disclosure discloses a motor driving system including a motor with an encoder and a motor driving device configured to control and drive the motor based on a motor control command. The motor driving device includes a first position detection unit configured to perform a magnetic pole position detection process for the motor to detect a position of the motor. When determining whether miswiring is present between the motor driving device and the motor, the motor driving device controls and drives the motor using a first detection result of the first position detection unit and determines miswiring of the motor based on a second detection result that is a position detection result of the motor by the encoder.