Adaptive Extractor Hood Blower Control With Torque-Speed Curves
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Solution Overview
Problem
Existing extractor hoods with asynchronous motors have limited flexibility in controlling torque-speed characteristics, restricting their ability to adapt to varying system conditions and user preferences, such as noise levels and extraction capacity.
Innovation Solution
The use of an electronically commutated synchronous motor with a control device that allows for flexible adjustment of torque-speed characteristics, enabling multiple operating modes (normal, power, eco, and boost) by storing and selecting different torque-speed curves, which can be adapted based on system characteristics and user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an asynchronous motor is used in the extractor hood, then the construction is cost-effective, but the torque-speed characteristic can only be changed to a limited extent
Solution Approach 1:
The patent applies parameter changes by switching from an asynchronous motor with fixed torque-speed characteristics to an electronically commutated synchronous motor where the torque-speed characteristics can be dynamically adjusted through electronic control parameters. The control device stores multiple torque-speed characteristic curves and can select different curves based on operating conditions, thereby changing the motor's performance parameters without physical modification.
2Device complexity
If the torque-speed characteristic is fixed by motor design, then the motor construction is simple, but the delivery volume-pressure difference characteristic of the extractor hood is also fixed
Solution Approach 1:
The patent applies dynamics by transforming the static torque-speed characteristic of traditional motors into a dynamic, adjustable characteristic. The electronically commutated synchronous motor allows real-time modification of torque-speed curves through electronic control, enabling the extractor hood to adapt its delivery volume-pressure difference characteristic to match varying system requirements such as different duct configurations or cooking intensities.
Solution Approach 2:
The control device stores multiple torque-speed characteristic curves as selectable parameters and can switch between them based on operating conditions. This parameter change capability allows the same motor hardware to produce different performance characteristics, effectively decoupling the physical motor construction from the operational characteristics.
3Adaptability or versatility
If multiple torque-speed characteristic curves are stored in memory, then the extractor hood can be adapted to individual customer needs, but the control device complexity increases
Solution Approach 1:
The patent manages control device complexity by implementing a memory-based parameter storage system that holds multiple pre-defined torque-speed characteristic curves. The control device can select and apply different parameter sets (characteristic curves) based on simple selection signals or operating conditions, achieving high adaptability without requiring complex real-time calculation or adjustment mechanisms.
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
This approach provides a high degree of flexibility in controlling delivery volume and pressure difference, allowing the extractor hood to be tailored to individual customer needs, improving extraction capacity or reducing noise levels as required.
Implementation Method 1
The blower motor is therefore designed as an electronically commutated synchronous motor, which is operated with direct current
Data Source
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AI summary
The invention relate to an extractor hood (2) comprising an electronically commutated blower motor (14) and a control (21) which is designed to control the blower motor (14) with a first or a second speed-torque characteristic curve (DK1, DK1a), the speed-torque characteristic curves (DK1, DK1a) having at least one common point (MA1, MS1).