Energization Control System for Three-Phase Motor Switching Elements
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Solution Overview
Problem
Existing energization control systems for three-phase motors, which use switching elements, face inefficiencies due to measurement errors from temperature sensors, leading to suboptimal usage of switching elements' capabilities.
Innovation Solution
An energization control system incorporating a sensor unit with a magnetic detection portion to measure magnetic flux density and a temperature detection portion to correct temperature characteristics, along with a control unit that adjusts current flow in heating elements based on temperature information, thereby minimizing errors and optimizing switching element performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are used to measure the temperature of switching elements, then the temperature can be monitored, but measurement errors increase leading to suboptimal usage of switching elements' capabilities
Solution Approach 1:
The patent introduces a magnetic field sensor as an intermediary device to indirectly measure the temperature of switching elements. Instead of directly measuring temperature with contact sensors that introduce errors, the system uses the magnetic field characteristics of the switching elements (which change with temperature) to infer temperature, thereby eliminating direct contact measurement errors while maintaining monitoring reliability
Solution Approach 2:
The patent replaces the mechanical/thermal contact-based temperature sensing system with a magnetic field-based sensing system. By substituting direct thermal measurement with magnetic field measurement, the system eliminates the measurement errors inherent in contact-based temperature sensors while preserving the ability to monitor switching element temperature for reliable operation
2Reliability
If margins are included in electric characteristics and rating to account for measurement errors, then reliability is improved, but the capability of switching elements cannot be fully utilized
Solution Approach 1:
The patent implements a feedback mechanism using magnetic field sensors to continuously monitor the actual temperature of switching elements in real-time. This accurate feedback allows the control system to adjust operating parameters dynamically, ensuring reliable operation at the true temperature limits rather than conservative estimated limits, thereby maximizing switching element capability utilization without compromising reliability
Solution Approach 2:
The patent changes the measurement parameter from direct temperature sensing to magnetic field sensing. This parameter change enables more accurate temperature determination, allowing the system to operate switching elements at their true capability limits with appropriate safety margins, thus improving both reliability and productivity by eliminating the need for excessive conservative margins
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
The system effectively reduces measurement errors and optimizes the usage of switching elements by accurately controlling current and temperature, preventing overheating and ensuring full capability utilization.
Implementation Method 1
a magnetic detection portion detecting a magnetic flux density of a magnetic flux generated at a surrounding of a conductor in response to a current flowing in the conductor
Implementation Method 2
a temperature detection portion detecting a temperature level within a package in which the magnetic detection portion is disposed
Implementation Method 3
a correction portion correcting a temperature characteristic of a detection result of the magnetic detection portion based on the detected temperature level
Implementation Method 4
a control unit including a control portion controlling a current flowing in a heating element of the electrical apparatus based on the temperature information
Data Source
AI summary
An energization control system includes a sensor unit including a magnetic detection portion detecting a magnetic flux density of a magnetic flux generated at a surrounding of a conductor in response to a current flowing in the conductor of an electrical apparatus, a temperature detection portion detecting a temperature level within a package in which the magnetic detection portion is disposed, a correction portion correcting a temperature characteristic of a detection result of the magnetic detection portion based on the detected temperature level, and an output portion outputting temperature information indicating the detected temperature level. The energization control system further includes a control unit including a control portion controlling a current flowing in a heating element of the electrical apparatus based on the temperature information.