Motor Thermal Protection Using Capacitor Timing for Heat Tracking
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Solution Overview
Problem
Current motor thermal protection devices cannot accurately track and monitor accumulative heat accumulation in real time, leading to potential overheating accidents due to their inability to determine remaining heat accumulation when the motor is powered on, relying on operator experience or prolonged cooling times.
Innovation Solution
A motor thermal protection device utilizing a capacitor timing circuit to measure power-off time and calculate remaining heat accumulation upon power-on, incorporating a power-off time determining unit and a heat accumulation calculating unit to ensure real-time monitoring and accurate tracking of heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the accumulative heat accumulation of the motor is judged based on the experience of the operator, then the operation is simple, but the accuracy is low and unnecessary accidents may occur
Solution Approach 1:
The patent replaces manual operator judgment with an automated electronic thermal protection device that uses a microcontroller, capacitor timing circuit, and calculation unit to automatically track and determine heat accumulation based on power-on and power-off timing, thereby improving measurement precision while managing device complexity through integrated circuit design
Solution Approach 2:
The thermal protection device performs self-monitoring and self-protection by automatically tracking its own operational state through the capacitor timing circuit that records power-on and power-off times, eliminating the need for external operator intervention and improving judgment accuracy through continuous automated monitoring
2Reliability
If the motor is waited to cool completely for enough time (generally, at least 50 minutes), then the heat accumulation is fully dissipated, but the productivity is reduced due to long idle time
Solution Approach 1:
The patent performs preliminary calculation of remaining heat accumulation before the motor is actually powered on again. The capacitor timing circuit continuously tracks power-on and power-off times, and the calculation unit computes remaining heat accumulation in advance, allowing the system to determine whether the motor is ready for operation without requiring the full 50-minute cooling period, thus improving productivity while maintaining thermal safety
Solution Approach 2:
The thermal protection device implements feedback by continuously monitoring the motor's operational state through the capacitor timing circuit and using the calculation unit to determine remaining heat accumulation, then providing real-time information about motor thermal status to control whether the motor should be powered on, thereby balancing reliability and productivity through dynamic decision-making
3Measurement precision
If the motor thermal protection device cannot know the remaining heat accumulation when the motor is powered on, then the device structure is simple, but the measurement precision of heat accumulation tracking is insufficient
Solution Approach 1:
The patent introduces a capacitor timing circuit as an intermediary element that indirectly measures the motor's thermal state. The capacitor charges and discharges during power-on and power-off cycles, and its voltage level serves as a mediator to represent the elapsed time and remaining heat accumulation, enabling accurate thermal tracking without requiring direct temperature sensing, thus improving measurement precision with moderate device 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 real-time monitoring and protection of motors and electromechanical equipment by determining the remaining heat accumulation when the motor is powered on, preventing overheating and ensuring safe operation by automatically powering off the motor when heat accumulation thresholds are met.
Implementation Method 1
a capacitor timing circuit, configured to time after the motor is powered off
Data Source
AI summary
It is disclosed a motor thermal protection device and operation method thereof. The motor thermal protection device utilizes a power supply of a motor for power supplying and comprises: a capacitor timing circuit, configured to time after the motor is powered off; a power-off time determining unit, configured to perform a reading operation of reading an output voltage of the capacitor timing circuit after the motor is powered on, and determine a power-off time from when the motor is powered off to when the motor is powered on according to the output voltage; and a heat accumulation calculating unit, configured to calculate a remaining heat accumulation when the motor is powered on according to the power-off time and a heat accumulation when the motor is powered off.