PCB Motor Control Using Posture-Aware Temperature Thresholds
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Solution Overview
Problem
Existing motor control devices struggle to accurately control motors based on the heat generation state of components mounted on printed circuit boards, due to errors in temperature detection and inability to account for changes in installation posture.
Innovation Solution
A motor control device with acceleration and temperature sensors disposed on the printed circuit board, which calculates posture information and temperature information to control the inverter circuit and adjust power supply to the motor based on set temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a temperature sensor is disposed in a heat sink to detect temperature, then the temperature detection range is extended, but a large error is caused between the detected temperature and the actual temperature of the part
Solution Approach 1:
The temperature sensor is extracted from the heat sink and repositioned directly on the printed circuit board adjacent to the inverter circuit. This extraction eliminates the thermal distance and intermediate structures that caused measurement errors, allowing the sensor to directly detect the temperature of the target component without the large errors that occurred when mounted on the heat sink.
Solution Approach 2:
The printed circuit board serves as an intermediary substrate that positions the temperature sensor in close proximity to the inverter circuit. By using the PCB as the mounting platform for both the sensor and the power electronics, the system achieves accurate temperature monitoring while maintaining a compact structure that eliminates the need for separate heat sink mounting.
2Adaptability or versatility
If an acceleration sensor is disposed in a housing to detect inclination, then the installation posture detection is performed, but the motor control device cannot acquire the installation posture of the printed circuit board when it changes independently or when the housing is not included
Solution Approach 1:
The acceleration sensor is merged with the printed circuit board structure, being disposed directly on the PCB rather than in a separate housing. This integration ensures that the sensor always accurately reflects the PCB's installation posture, eliminating the reliability issues that occurred when the PCB could change posture independently from the housing or when no housing was present.
Solution Approach 2:
The printed circuit board itself serves as the mounting platform for the acceleration sensor, making the system self-sufficient for posture detection. The PCB's own structure provides the reference frame for angle calculation, eliminating dependency on external housings and enabling reliable posture detection in all installation scenarios.
3Measurement precision
If the temperature sensor is disposed on the printed circuit board, then the temperature detection accuracy is improved, but the heat dissipation mechanism becomes more complex
Solution Approach 1:
The printed circuit board is given multiple functions: it serves as the structural support for mounting components, as the platform for electrical connections, and as the reference frame for temperature and posture sensing. By making the PCB multi-functional, the system achieves accurate temperature detection without adding separate heat dissipation structures, thereby avoiding increased complexity.
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
Enables accurate control of motors according to the actual heat generation state of components on the printed circuit board, reducing errors in temperature detection and effectively managing heat generation across various installation postures.
Implementation Method 1
an acceleration sensor to be disposed on a printed circuit board, detect an acceleration corresponding to a posture of the printed circuit board
Implementation Method 2
a temperature sensor to be disposed on the printed circuit board, detect a temperature on the printed circuit board
Implementation Method 3
the inverter circuit generates heat during an operation of the inverter circuit, and the temperature in the motor control device increases
Data Source
AI summary
A motor control device includes, on a printed circuit board, an acceleration sensor that detects an acceleration corresponding to a posture of the printed circuit board, and outputs, as acceleration information, the acceleration detected, a temperature sensor that detects a temperature on the printed circuit board, and outputs, as detected temperature, the temperature detected, an inverter circuit that drives a motor, and a control circuit that calculates posture information indicating the posture of the printed circuit board on the basis of the acceleration information, calculates temperature information indicating a temperature of a part disposed on the printed circuit board on the basis of the detected temperature, and controls the inverter circuit by outputting, to the inverter circuit, a power supply command for the motor based on a temperature threshold set for each piece of the posture information, the posture information, and the temperature information.