Blower Motor Failure Prevention via Airflow Detection
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Solution Overview
Problem
Blowers used to deflate pneumatically inflated structures can cause motor failure due to sudden loss of airflow, leading to increased rotational frequency and heat buildup when air is completely evacuated, as the motor load decreases and heat dissipation is impaired.
Innovation Solution
A blower design incorporating a housing with suction and discharge ports, a motor, fan, motor drive circuit, and control circuit that detects insufficient airflow based on operation parameters such as rotational frequency and drive current, allowing for preventive measures like reducing or stopping the motor to prevent failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blower is used to completely evacuate air from a pneumatically inflated structure, then the deflation function is achieved, but the motor rotational frequency abruptly increases and heat is not released, leading to motor failure
Solution Approach 1:
The control circuit detects airflow amount in advance before motor failure occurs. When insufficient airflow is detected (indicating the pneumatically inflated structure has been completely evacuated), the control circuit proactively reduces or stops the motor operation, preventing the abrupt increase in rotational frequency and heat buildup that would lead to motor failure.
Solution Approach 2:
The control circuit continuously monitors the airflow amount as feedback from the blower operation. Based on this feedback, the control circuit adjusts the motor operation dynamically - reducing or stopping the motor when airflow becomes insufficient, thereby preventing motor failure while maintaining effective deflation performance.
2Duration of action of moving object
If the motor continues to operate after air evacuation is complete, then continuous operation capability is maintained, but heat generated in the motor is not released and motor failure occurs
Solution Approach 1:
The control circuit uses airflow amount as a feedback signal to monitor the operational state. When airflow becomes insufficient (indicating complete evacuation), the control circuit receives this feedback and automatically reduces or stops motor operation, preventing continuous operation under no-load conditions that would cause heat accumulation and motor failure.
Solution Approach 2:
The blower system performs self-protection through the control circuit that automatically detects the evacuation completion state and adjusts motor operation accordingly. The system serves itself by monitoring its own operational parameters and taking corrective action to prevent damage, eliminating the need for external intervention or complex thermal management systems.
Data Source
AI summary
A blower in one aspect of the present disclosure includes: a housing including a suction port and a discharge port; a motor in the housing; a fan in the housing; a motor drive circuit; and a control circuit. The control circuit detects an insufficient airflow from the suction port to the discharge port based on an operation parameter. The operation parameter is associated with an operation of the motor.