Electric Motor Control Device for Fan Abnormality Overheat Prevention
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Solution Overview
Problem
Existing electric motor systems face challenges in continuing operation without overheating when a fan abnormality occurs, leading to potential shutdowns that disrupt work processes.
Innovation Solution
A control device for electric motors that acquires cooling operation information and running information, determining if the cooling operation is normal, and adjusts the motor's operation to prevent overheating by reducing the current value if an abnormality is detected, allowing for continued operation without immediate shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric motor continues to operate at normal power when fan abnormality occurs, then productivity is maintained, but the motor temperature rises causing overheating damage
Solution Approach 1:
The control device dynamically adjusts the motor output power based on real-time temperature monitoring and fan operation status. When fan abnormality is detected, the system transitions from normal power operation to reduced power operation, and further to stop operation when temperature exceeds thresholds, creating a dynamic response that balances productivity with temperature control
Solution Approach 2:
The system implements a feedback control mechanism where temperature sensors continuously monitor motor temperature and feed this information back to the control device. The control device processes this feedback along with fan operation status to determine appropriate power adjustment levels, creating a closed-loop control system that prevents overheating while maximizing continuous operation capability
2Reliability
If the electric motor is stopped immediately when fan abnormality is detected, then overheating is prevented, but work process interruption occurs reducing productivity
Solution Approach 1:
The control device performs preliminary actions by detecting fan abnormalities early through monitoring fan rotation status. Upon detection, it proactively reduces motor power before temperature reaches dangerous levels, and establishes a staged response protocol that allows continued operation at reduced power for a period, thereby preventing overheating while maintaining work continuity
Solution Approach 2:
The system implements beforehand cushioning by creating temperature and time buffers through staged power reduction. Instead of immediate shutdown, the system first reduces power to a lower level that generates less heat, providing a cushion period during which the motor can continue operating without immediate shutdown, thereby maintaining productivity while preventing overheating
3Temperature
If the motor power is reduced when fan abnormality occurs, then temperature is controlled, but output power decreases affecting productivity
Solution Approach 1:
The control device changes operational parameters by adjusting motor output power levels based on detected fan abnormality conditions. It transitions the motor from normal power mode to reduced power mode, and subsequently to stop mode based on temperature thresholds, thereby controlling temperature while accepting temporary power reduction as a trade-off for preventing damage
Data Source
AI summary
A control device capable of continuously operating an electric motor even when an abnormality occurs in a fan. The control device includes: a cooling operation information acquisition section configured to acquire cooling operation information of the fan; a cooling operation determination section configured to determine whether the cooling operation information indicates a normal cooling operation; a running information acquisition section configured to acquire running information of the electric motor; and a running control section configured to, in accordance with a determination that the cooling operation information does not indicate the normal cooling operation, control an operation of the electric motor to be in an overheat-prevented state by referring to the running information.