HVAC Actuator Saturation Magnetization for Reliable Pulse Detection
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Solution Overview
Problem
Existing HVAC actuators generate inconsistent current pulse waveforms, making it difficult for climate control modules to accurately determine the position of airflow control doors, leading to undetected pulses and diagnostic trouble codes.
Innovation Solution
An HVAC actuator with a stator magnet magnetized to saturation, producing consistent and uniform current pulse waveforms upon rotation, facilitating precise position detection by climate control modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional actuator is used, then the actuator can rotate the axle and move the airflow control door, but the current pulse waveforms generated are inconsistent and difficult to detect
Solution Approach 1:
The patent applies parameter changes by magnetizing the stator magnet to saturation, which fundamentally changes the magnetic field strength parameter. This saturation magnetization ensures that the magnetic field remains constant and does not fluctuate, thereby generating consistent current pulse waveforms with uniform amplitude and shape that can be reliably detected by the climate control module, resolving both the reliability and measurement precision issues
2Loss of information
If the climate control module counts current pulse waveforms to determine door position, then position information can be obtained, but inconsistent waveforms cause pulses to go undetected and generate diagnostic trouble codes
Solution Approach 1:
By changing the magnetization parameter of the stator magnet to saturation level, the patent ensures that the magnetic field strength remains constant throughout operation. This eliminates waveform inconsistency, ensuring that every current pulse is uniformly shaped and detectable, thereby preventing pulse loss and diagnostic trouble codes while maintaining accurate position information
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
The consistent current pulse waveforms enable accurate determination of airflow control door positions, reducing diagnostic issues and improving system reliability.
Implementation Method 1
a stator magnet magnetized to saturation, which results in the actuator producing a consistent waveform in response to rotation of the actuator
Implementation Method 2
The actuator generates current pulse waveforms as the actuator rotates the axle
Data Source
AI summary
A heating, ventilation, and air conditioning (HVAC) system actuator including a stator magnet and a rotor magnet. The rotor magnet turns an axle connected to an airflow door such that rotation of the axle moves the door and generates waveforms. The number of waveforms generated corresponds to how much the axle has rotated. The stator magnet is magnetized to a saturated state, thereby providing the waveforms with a consistent shape that is consistently detectable by a climate control pulse count module.