Fan Motor Torque Reversal for Fluid Path Restriction Detection
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Solution Overview
Problem
Existing systems for detecting restrictions in fluid flow paths, such as filters or piping, require additional sensors like pressure or flow sensors, which increase costs and complexity.
Innovation Solution
A motor controller that operates a fan in a restriction detection mode by reversing its rotation direction, allowing the controller to determine torque levels and detect restrictions without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors (pressure or flow sensors) are installed in the fluid flow path to detect restrictions, then the ability to determine the condition of the fluid flow path is improved, but the cost of the overall system increases
Solution Approach 1:
The motor controller uses the motor's own operating parameters (current, speed, power) to detect restrictions in the fluid flow path. The motor essentially monitors its own performance characteristics, eliminating the need for external sensors. The controller compares actual operating parameters against expected parameters to identify deviations indicating restrictions.
Solution Approach 2:
The motor controller performs multiple functions: it controls motor operation and simultaneously detects fluid flow path conditions using the same motor's operating data. This multi-functionality eliminates the need for separate detection sensors, reducing system complexity and cost while maintaining detection capability.
2Measurement precision
If additional sensors are installed to detect restrictions in the fluid flow path, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the detection function from separate physical sensors and integrates it into the existing motor controller. By analyzing motor operating parameters (current, speed, power) that are already being measured for control purposes, the system derives restriction detection capability without adding separate sensing components.
Solution Approach 2:
The motor controller combines motor control functions with fluid flow path condition monitoring functions. The same controller hardware and processing resources are used for both controlling motor operation and detecting restrictions, eliminating the need for separate detection devices and reducing overall system complexity.
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 cost-effective detection and characterization of restrictions in fluid flow paths without the need for pressure or flow sensors, reducing overall system costs while maintaining functionality.
Implementation Method 1
determine a torque associated with the motor while the motor is rotating the fan in the second direction
Data Source
AI summary
A motor controller configured to be coupled to a motor that is coupled to a fan is described. The motor controller includes a processor coupled to a memory, and is configured to operate the motor in a first operating mode in which the motor rotates the fan in a first direction at a first speed. The motor controller is further configured to operate the motor in a restriction detection mode in which the motor rotates the fan in a second direction that is opposite the first direction, determine a torque associated with the motor while the motor is rotating the fan in the second direction, determine that the torque is not within a predefined threshold range in the memory, and determine that a restriction exists in a fluid flow path associated with the motor in response to determining that the torque is not within the predefined threshold range.