Motor Drive Device Phase Anomaly Detection Segmentation
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Solution Overview
Problem
Conventional motor drive devices for vehicles lack effective anomaly detection capabilities, particularly in identifying which phase of a multi-phase motor is experiencing an anomaly, such as overcurrent or open load issues, which can lead to safety concerns and complex monitoring sequences.
Innovation Solution
The motor drive device incorporates dedicated overcurrent and open load detection circuits for each phase, along with an anomaly detection flag signal output circuit that notifies an external micro control unit (MCU) through specific output terminals, allowing for easy identification of anomalous phases without the need for external current detection circuits or complex monitoring sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional anomaly detection functions are used to detect overcurrent and open load, then basic safety detection is achieved, but the ability to identify which specific phase has an anomaly is lost
Solution Approach 1:
The patent divides the detection function into separate detection circuits for each phase (first detection circuit for Phase A, second detection circuit for Phase B). Each detection circuit independently monitors its assigned phase, enabling precise identification of which phase has an anomaly while keeping each individual detection circuit relatively simple in structure.
2Measurement precision
If external current detection circuits are used to identify anomalous phases, then phase identification capability is improved, but device complexity and external component requirements increase
Solution Approach 1:
The patent combines the detection circuits and the motor drive function into a single integrated device. The detection circuits are built-in components that work together with the drive circuitry to monitor and identify phase anomalies, eliminating the need for separate external current detection circuits and simplifying the overall system architecture.
Solution Approach 2:
The motor drive device is designed to perform multiple functions: it both drives the motor and detects anomalies in the motor phases. The integrated detection circuits serve dual purposes by monitoring phase conditions while being part of the drive system, reducing the need for dedicated external monitoring equipment.
Data Source
AI summary
A motor drive device of an embodiment includes a first drive circuit, a second drive circuit, a first detection circuit, a second detection circuit, a third detection circuit, a fourth detection circuit, and an output circuit. The first drive circuit drives a first phase of a motor. The second drive circuit drives a second phase of the motor. The first detection circuit detects a first anomaly of the first phase. The second detection circuit detects the first anomaly of the second phase. The third detection circuit detects a second anomaly of the first phase. The fourth detection circuit detects the second anomaly of the second phase. The output circuit outputs an occurred anomaly as a flag signal based on results of detection by the first to fourth detection circuits.