Motor Drive Control Device Reverse Rotation Detection
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Solution Overview
Problem
Motor drive control devices using one-sensor drive systems struggle to accurately and swiftly detect abnormal conditions, such as reverse rotation, due to limitations in detecting external load-induced issues like strong outside winds or pressure differences, which can cause motors to rotate in unintended directions.
Innovation Solution
A motor drive control device with a control circuit section that determines the commanded rotational speed based on actual speed calculations from a position signal, monitors current and rotational speed, and uses predetermined thresholds to identify abnormal conditions like overcurrent or reverse rotation, allowing for timely motor shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-sensor drive is used to reduce device complexity, then the number of sensors is reduced, but the ability to detect abnormal conditions such as reverse rotation is lost
Solution Approach 1:
The patent implements feedback by continuously monitoring current values during motor operation and comparing them against predetermined thresholds. The control circuit section receives current information from the motor drive section and uses this feedback to detect abnormal conditions such as reverse rotation, thereby maintaining reliability while using only one sensor.
2Device complexity
If one-sensor drive is used to simplify the system, then hardware is reduced, but the speed and accuracy of abnormal condition detection deteriorates
Solution Approach 1:
The control circuit section continuously receives current information during motor operation and immediately compares it with predetermined thresholds, enabling real-time detection of abnormal conditions. This continuous feedback mechanism ensures rapid detection response without requiring multiple sensors or complex hardware.
3Adaptability or versatility
If external load is applied before motor starts, then the motor may rotate in reverse due to external forces, but the one-sensor system cannot detect this abnormal state
Solution Approach 1:
The patent uses feedback from current monitoring to detect reverse rotation caused by external loads. When the motor rotates in reverse due to external forces, the current characteristics change, and the control circuit section detects this through continuous current feedback and comparison with thresholds, enabling reliable detection despite the single-sensor limitation.
Data Source
AI summary
Provided is a motor drive control device capable of accurately and speedily detecting an abnormal condition of a motor. When the motor is started, the control circuit section determines the commanded rotational speed in accordance with an actual rotational speed calculated based on the position signal, the control circuit section determines whether or not the motor is in an abnormal condition based on a predetermined determination condition for a predetermined period, upon determining that the motor is in the abnormal condition, the control circuit section outputs the drive control signal to the motor drive section to stop the motor, and the abnormal condition includes a reversely rotating state. In the reversely rotating state the motor rotating in a direction opposite to a rotating direction when the motor is successfully started.