System and method for detecting a loose blower wheel of a heating, ventilation, and air conditioning system
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Solution Overview
Problem
Existing HVAC systems lack the ability to self-diagnose issues, requiring multiple technician visits for diagnosing and repairing a loose blower wheel, leading to extended downtime.
Innovation Solution
A monitoring system that includes a processor communicatively coupled to a thermostat and an HVAC system, using electrical voltage and current sensors to detect a loose blower wheel by measuring torque, speed, and time thresholds to send a notification for timely repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a technician inspects the HVAC system to diagnose issues, then the issue can be identified, but the system experiences extended downtime due to multiple trips
Solution Approach 1:
The monitoring system continuously measures blower wheel torque and speed parameters in advance, detecting loose blower wheel conditions before they cause system failure. This preliminary detection eliminates the need for multiple technician trips, as the issue is identified proactively rather than reactively after failure occurs.
Solution Approach 2:
The HVAC system performs self-diagnosis through the monitoring system that automatically detects loose blower wheels by analyzing torque and speed parameters. This self-service capability eliminates the need for external technician inspection for routine diagnostics, reducing downtime while maintaining accurate issue identification.
2Ease of operation
If the HVAC system provides only a general error alert, then the system is simple to operate, but the technician cannot prepare appropriate parts and tools in advance
Solution Approach 1:
The monitoring system provides specific feedback about blower wheel conditions by continuously measuring torque and speed parameters and comparing them against expected ranges. This feedback mechanism delivers precise diagnostic information (e.g., 'loose blower wheel detected') while maintaining simple operation through automatic analysis, allowing technicians to prepare appropriately without complex user interaction.
Solution Approach 2:
The monitoring system acts as an intermediary between the blower components and the technician, translating raw torque and speed measurements into specific diagnostic information about loose blower wheels. This intermediary function preserves operational simplicity while delivering detailed diagnostic data that enables proper preparation.
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
Reduces HVAC system downtime by allowing early detection of a loose blower wheel, ensuring technicians arrive prepared with necessary equipment, thus minimizing operational disruptions.
Implementation Method 1
An electrical current sensor that is coupled to the blower senses an electrical current provided to a motor of the blower
Implementation Method 2
An electrical voltage sensor that is coupled to the blower senses an electrical voltage provided to a motor of the blower
Implementation Method 3
The monitoring system determines a torque applied to a blower wheel of the blower based on the sensed electrical current and the sensed electrical voltage
Implementation Method 4
the monitoring system determines a speed of the blower wheel based on the sensed electrical current and the sensed electrical voltage
Data Source
AI summary
A method includes operating a motor to impart rotary motion to a load, and receiving electrical data indicative of operation of the motor. The method proceeds by determining, based on the electrical data, a torque value applied by the motor to the load and a speed value of the load, comparing the torque value to a torque threshold, and, in response to the torque value meeting or exceeding the torque threshold, comparing the speed value to a speed threshold. The method concludes by determining, in response to the speed value being less than the speed threshold for at least a predetermined time interval after the torque value meets or exceeds the torque threshold, that the load is loosely coupled to the motor, and generating an indication of the loose coupling condition.