Motor Control Board Temperature Sensing for Winding Estimation
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Solution Overview
Problem
The existing method for estimating motor winding temperature requires measuring terminal-to-terminal resistance at reference temperature and storing values in non-volatile memory, increasing manufacturing costs and process complexity.
Innovation Solution
The solution involves disposing temperature detecting portions on a control board at two locations with different temperature change tendencies, allowing for accurate temperature estimation of an electric motor without the need for additional sensors near the motor and simplifying the logic for temperature estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminal-to-terminal resistance is measured at reference temperature and stored in non-volatile memory for each product, then motor winding temperature estimation accuracy is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The control board serves itself by using its own internal temperature detecting portions to measure temperatures at multiple locations. This eliminates the need for external temperature sensors near the motor and the complex process of measuring and storing terminal-to-terminal resistance for each product, while still enabling accurate motor winding temperature estimation through the established temperature relationship between the control board and motor
Solution Approach 2:
The control board acts as an intermediary element that indirectly measures motor temperature through temperature detecting portions placed on its own surface. By measuring temperatures at multiple locations on the control board and using the predetermined temperature relationship, the system estimates motor winding temperature without requiring direct measurement at the motor or complex resistance measurements
2Ease of manufacture
If temperature detecting portions are disposed on control board at two locations with different temperature change tendencies, then motor temperature estimation is simplified and manufacturing cost is reduced, but temperature measurement directness decreases
Solution Approach 1:
The control board's temperature detecting portions serve multiple functions: they monitor the control board's own temperature for thermal management and simultaneously enable motor winding temperature estimation. This multi-functionality eliminates the need for separate temperature sensors at the motor, reducing manufacturing cost while maintaining estimation accuracy through the predetermined temperature relationship established during system design
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
This approach reduces manufacturing costs by eliminating the need for complex initial resistance measurements and provides accurate temperature estimation, enabling effective motor protection without increasing the number of components or manufacturing steps.
Implementation Method 1
temperature detecting portions disposed on a control board that controls driving of an electric motor at least at two locations that differ in temperature change tendency
Data Source
AI summary
An electric motor control device includes a control board that controls the driving of an electric motor and temperature detecting portions disposed on the control board at least at two locations that differ in temperature change tendency.