Circulator Blower Motor Tap Selection Using Power Consumption Mapping
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Solution Overview
Problem
The existing HVAC systems face challenges in efficiently monitoring and controlling the circulator blower motor speeds, leading to increased costs and installation time due to the need for multiple discrete sensors, which are costly and time-consuming to install and operate.
Innovation Solution
A circulator blower controller that includes an interface to receive demand signals from a thermostat, a switching circuit to connect power to multiple taps of the motor, and a processor to determine the optimal speed based on observed power consumption, allowing for adaptive speed control and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple discrete sensors are used to monitor motor speeds, then measurement precision is improved, but device complexity and installation time increase
Solution Approach 1:
The patent combines multiple speed measurement functions into a single monitoring system that uses one sensor to detect motor speed across multiple taps. The controller integrates speed monitoring and tap selection functions, eliminating the need for separate sensors for each speed level and reducing installation complexity while maintaining measurement precision.
Solution Approach 2:
The monitoring system is designed to be multi-functional, capable of measuring motor speed at multiple taps and automatically selecting the appropriate tap based on system conditions. This universal system replaces multiple dedicated sensors, reducing device complexity while preserving the ability to precisely monitor and control motor speeds.
2Measurement precision
If multiple discrete sensors are used to monitor motor speeds, then measurement precision is improved, but installation time increases
Solution Approach 1:
The patent merges multiple speed sensing functions into a single integrated monitoring system. By using one sensor to monitor motor speed across multiple taps rather than installing separate sensors for each speed level, the installation time is significantly reduced while the system maintains the precision needed for accurate speed measurement and control.
3Loss of energy
If adaptive speed control is implemented, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements adaptive speed control through a feedback mechanism where the monitoring system continuously measures motor speed and system conditions, and the controller adjusts motor tap selection based on this feedback to optimize energy efficiency. This feedback-based approach achieves energy savings while keeping the control system relatively simple by using existing motor taps rather than requiring complex variable speed drives.
Solution Approach 2:
The system performs self-adjustment of motor speed based on monitored conditions without requiring complex external control. The controller automatically selects appropriate taps based on system state, enabling energy-efficient operation through self-service control that minimizes the need for complex additional control hardware.
Data Source
AI summary
A circulator blower controller for a circulator blower of a heating, ventilation, and air conditioning (HVAC) system of a building includes an interface configured to receive a demand signal with an operating mode from a thermostat. A switching circuit selectively connects power to a tap of a motor of the circulator blower. A data store configured to store a mapping from a speed to the tap. For each tap, a processor observes power consumed by the circulator blower while power is connected to the tap by the switching circuit. The processor determines the mapping by sorting the taps based on observed power consumption. The processor selects a first speed based on the demand signal from the thermostat. The processor identifies a first tap from the mapping based on the first speed and generates the tap selection signal to control the switching circuit to connect power to the first tap.