Radial blower
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Solution Overview
Problem
The existing radial blowers with external rotor electric motors suffer from suboptimal operating characteristics due to electromagnetic interference between the rotating motor and control electronics, leading to non-smooth motor control.
Innovation Solution
A metallic cover element is integrated into the attachment housing to shield the control electronics from electromagnetic radiation, providing grounding and acting as a semiconductor cooling element, while also serving as a mechanical stiffening component to enhance the blower's structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control electronics is placed in the attachment housing close to the electric motor, then the device complexity is reduced and ease of operation is improved, but electromagnetic interference occurs causing non-optimal motor control
Solution Approach 1:
A metallic partition wall is introduced as an intermediary element between the control electronics and the electric motor. This partition wall acts as a shield that blocks electromagnetic radiation from the motor from interfering with the control electronics, while allowing both components to remain in close proximity in the attachment housing.
Solution Approach 2:
The attachment housing is segmented into different zones using the metallic partition wall. The control electronics are separated from the electric motor by this partition, creating distinct electromagnetic zones that prevent interference while maintaining the compact integrated structure.
2Device complexity
If the control electronics is positioned close to the electric motor in the attachment housing, then the device structure is simplified, but electromagnetic radiation from the motor adversely affects the control electronics
Solution Approach 1:
The metallic partition wall serves as a protective intermediary that shields the control electronics from electromagnetic radiation generated by the nearby electric motor. This allows the simplified housing structure to be maintained while ensuring reliable operation of the control electronics.
Solution Approach 2:
The metallic partition wall, which adds some structural complexity, converts the harmful electromagnetic radiation into a contained field that does not interfere with control electronics. The partition transforms the potential harm of close proximity into a beneficial shielded arrangement.
3Ease of manufacture
If the control electronics is located near the electric motor, then the attachment housing design is simplified, but electromagnetic coupling occurs leading to non-smooth motor operation
Solution Approach 1:
The metallic partition wall acts as a physical and electromagnetic intermediary that prevents coupling between the motor and control electronics. This allows the attachment housing to remain a simple integrated structure while eliminating electromagnetic coupling effects.
Solution Approach 2:
The partition wall segments the internal space of the attachment housing, separating the electromagnetic fields of the motor and control electronics. This segmentation maintains manufacturing simplicity while preventing harmful electromagnetic coupling.
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 solution effectively reduces electromagnetic interference, improves motor control performance, and enhances the blower's mechanical stability, allowing for improved operational characteristics and efficient heat management.
Implementation Method 1
the cover element protects against the electromagnetic radiation produced by the electric motor, so that its coupling into the control electronics is avoided. Thus the cover element forms an 'EMV shield' (EMV=electromagnetic tolerance or electromagnetic interference 'EMI' shield).
Implementation Method 2
the cover element can exhibit at least one form-stamped contact area which in the mounted state contacts a semiconductor component part of the control electronics for heat transfer. The heat loss produced from each semiconductor component is thus absorbed by the cover element and released to the environment.
Implementation Method 3
it can also be advantageous for the cover element to exhibit surface areas which are fitted to contact the shape of the blower housing. As a result thereof, a heat transfer is achieved inside the housing walls in the flowing air moved across the housing walls.
Data Source
AI summary
A blower (1) with a blower housing (2), a blower wheel (4) positioned so as to rotate inside a blower housing (2), an electric motor (6) for the rotational drive of the blower wheel (4), as well as with a saucer-shaped attachment housing (8) positioned externally on the blower housing (2). The attachment housing (8) contains motor-control electronics (10) and exhibits in its connection area facing the blower housing (2) a metallic cover element (14) covering the motor control electronics (10) and protects against an electromagnetic radiation from the electric motor (6).