Motor Interface Assembly for Temperature-Based Blower Speed Control
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Solution Overview
Problem
HVAC systems with electronically commutated motors (ECMs) face inefficiencies and increased costs due to the need for complex communication controls to modulate air flow, and single-stage thermostats fail to utilize motor efficiency effectively.
Innovation Solution
A motor interface assembly that measures discharge air temperature and adjusts the blower assembly's speed taps using a temperature sensing device and computing element to operate the switching device, allowing for variable air flow control without expensive communication controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If communication controls through wire harness are used to modulate air flow, then air flow control capability is improved, but system cost and complexity increase
Solution Approach 1:
The patent extracts the communication interface and wire harness from the system, replacing them with a simpler temperature-based control mechanism. The motor interface assembly directly senses discharge air temperature and adjusts motor speed taps without requiring complex communication protocols or additional wiring between thermostat and motor.
Solution Approach 2:
The invention uses inexpensive temperature sensing and basic switching components instead of expensive communication modules. The control system achieves variable air flow functionality using simple, cost-effective parts that do not require complex integration or programming.
2Ease of operation
If single stage thermostat is used with ECM motor, then system simplicity is maintained, but motor efficiency is not fully utilized
Solution Approach 1:
The motor interface assembly implements a feedback mechanism by continuously monitoring discharge air temperature and using this information to automatically adjust motor speed taps. This closed-loop control enables the system to optimize motor efficiency based on actual operating conditions while maintaining compatibility with simple single-stage thermostats.
Solution Approach 2:
The system performs self-adjustment by using the motor interface assembly to autonomously select appropriate speed taps based on temperature differential calculations. The system serves itself by automatically optimizing motor operation without requiring complex thermostat communication or manual intervention.
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 efficient and cost-effective control of air flow in HVAC systems by selecting appropriate speed taps based on temperature differences, enhancing motor utilization and simplifying system complexity.
Implementation Method 1
a temperature sensing device in electrical communication with a computing element
Data Source
AI summary
A motor interface assembly configured to be operably coupled to a blower assembly, wherein the motor interface assembly is configured to measure a discharge air temperature, determine a difference between the discharge air temperature and a predetermined temperature, and operate the blower assembly based in part on the difference between the discharge air temperature and a predetermined temperature.