Electromagnetic Brake Clutch Web Structure for Secondary Air Gap Removal
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Solution Overview
Problem
Existing electromagnetic brakes or clutches have inefficiencies in electrical control due to secondary air gaps that increase magnetic resistance and reduce the effective use of permanent magnet flux, leading to higher material usage and costs.
Innovation Solution
The design eliminates the secondary air gap by incorporating a web as a magnetic flux bridge between the inner and outer ring bodies, creating a continuous magnetic circuit and using a soft magnetic material for the magnet pot to enhance magnetic conductivity, thereby optimizing the use of magnet material and reducing installation space and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a secondary air gap is introduced between the outer ring body and inner ring body to accommodate the permanent magnet, then the permanent magnet can be positioned between the poles, but the magnetic resistance increases and coil efficiency decreases
Solution Approach 1:
A web structure is introduced as an intermediary magnetic flux bridge between the outer ring body and inner ring body. This web eliminates the secondary air gap while providing a dedicated path for permanent magnet flux, thereby maintaining coil efficiency while enabling proper permanent magnet positioning.
Solution Approach 2:
The magnet housing is segmented into three distinct components: the outer ring body, the inner ring body, and the connecting web. This segmentation allows the permanent magnet to be positioned between the ring bodies while the web provides a separate magnetic flux path, resolving the conflict between magnet positioning and magnetic resistance.
2Quantity of substance
If a secondary air gap is used to separate the ring bodies, then the permanent magnet can be disposed between them, but magnetic shunts are created that reduce the effectiveness of magnet material
Solution Approach 1:
The web acts as an intermediary magnetic flux bridge that prevents magnetic shunting through the magnet housing. By providing a dedicated low-reluctance path for permanent magnet flux, the web ensures that magnet material is used effectively to generate force at the pole faces rather than being short-circuited through the housing.
3Device complexity
If the magnet housing is made magnetically conductive to provide poles, then the housing can serve structural and magnetic functions, but it creates unwanted magnetic shunts that reduce control efficiency
Solution Approach 1:
The magnet housing is segmented to distinguish between structural housing components and active magnetic circuit components. The web is specifically designed as a magnetically conductive bridge, while other housing parts can be less conductive, thereby providing poles where needed while minimizing unwanted magnetic shunts elsewhere in the structure.
Solution Approach 2:
The web serves as an intermediary magnetic flux bridge that directs permanent magnet flux efficiently between the ring bodies. By concentrating magnetic conductivity in this specific location rather than throughout the entire housing, the design achieves effective pole provision while minimizing parasitic magnetic shunts that would reduce electrical control efficiency.
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 configuration increases the efficiency of electrical control, reduces material usage, and enhances the magnetic flux, resulting in improved performance and cost-effectiveness by eliminating undesirable magnetic shunts and secondary air gaps.
Implementation Method 1
the electromagnet comprising a magnet housing and a coil accommodated therein
Implementation Method 2
a ring-shaped permanent magnet is disposed whose cross-sectional thickness between its inner diameter and its outer diameter is less than its axial dimension
Implementation Method 3
a web which serves as a magnetic field bridge and which connects the inner ring body to the outer ring body is arranged between the inner ring body and the outer ring body
Implementation Method 4
an armature plate interacting with the electromagnet and arranged on a hub body so as to be rotatable but nevertheless axially displaceable
Data Source
AI summary
The disclosure relates to an electromagnetic brake or clutch having an electromagnet, a permanent magnet and an armature plate interacting with the electromagnet and the permanent magnet, which armature plate is arranged on a hub body so as to be non-rotatable but nevertheless axially displaceable, the electromagnet having a magnet housing and a coil received therein, wherein the magnet housing has, on the armature plate side, an outer ring body providing an external pole and an inner ring body providing an internal pole, characterized in that the inner ring body carries the permanent magnet on the armature plate side and that a web which serves as magnetic flux bridge and connects the inner ring body to the outer ring body is disposed between the inner ring body and the outer ring body.