Circulator Blower Motor Speed Control 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, thereby optimizing motor speed and reducing the need for extensive sensor networks.
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 monitoring functions into a single controller that uses power consumption measurements to determine motor speed. Instead of using multiple discrete sensors to monitor different aspects of motor operation, the system merges these functions into one integrated solution that infers speed from electrical power data already present in the system.
Solution Approach 2:
The system uses the motor's own electrical characteristics (power consumption) to determine its operating speed, eliminating the need for external sensing devices. The motor effectively monitors itself through its electrical signature, reducing the need for additional measurement infrastructure.
2Measurement precision
If multiple discrete sensors are installed, then measurement precision is improved, but installation time increases
Solution Approach 1:
The patent combines multiple speed monitoring functions into a single controller that uses power consumption measurements to determine motor speed. Instead of using multiple discrete sensors to monitor different aspects of motor operation, the system merges these functions into one integrated solution that infers speed from electrical power data already present in the system.
Solution Approach 2:
The system uses the motor's own electrical characteristics (power consumption) to determine its operating speed, eliminating the need for external sensing devices. The motor effectively monitors itself through its electrical signature, reducing the need for additional measurement infrastructure.
3Measurement precision
If multiple discrete sensors are used, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent combines multiple speed monitoring functions into a single controller that uses power consumption measurements to determine motor speed. Instead of using multiple discrete sensors to monitor different aspects of motor operation, the system merges these functions into one integrated solution that infers speed from electrical power data already present in the system.
Solution Approach 2:
The system uses the motor's own electrical characteristics (power consumption) to determine its operating speed, eliminating the need for external sensing devices. The motor effectively monitors itself through its electrical signature, reducing the need for additional measurement infrastructure.
4Productivity
If motor runs at high speed continuously, then productivity is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic speed adjustment by allowing the motor to operate at different speeds based on actual system needs. The controller monitors conditions and adjusts motor speed accordingly, transitioning between low, medium, and high speed operations rather than maintaining a constant high speed, thereby optimizing both productivity and energy consumption.
Solution Approach 2:
The system changes the operational parameters of the motor by selecting from multiple discrete speed taps (different power consumption levels) based on environmental conditions and system demands. This allows the motor to operate at the minimum necessary speed for each situation rather than always at maximum capacity.
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.