Electric Motor Torque Arm Vibration Damping
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Solution Overview
Problem
Existing electric motors with fan hoods and sensors face challenges in maintaining effective torque transmission and vibration damping due to vibrations in the axial and radial directions, which affect the accuracy and reliability of the angle sensor.
Innovation Solution
The electric motor incorporates a torque support part with a stiffening ring and deformation sections that create a preload by pressing tabs into recesses in the fan hood, providing axial elastic force and maintaining torque transmission, while damping parts help absorb vibrations, ensuring rigidity in the circumferential direction and damping in the axial and radial directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid torque support part is used to maintain torque transmission, then torque transmission effectiveness is improved, but the ability to dampen vibrations in axial and radial directions deteriorates
Solution Approach 1:
The torque support part has different rigidity characteristics in different directions: it is rigid in the circumferential direction to transmit torque effectively, but flexible in axial and radial directions to dampen vibrations. This directional differentiation of mechanical properties resolves the contradiction between torque transmission and vibration damping.
Solution Approach 2:
The wall thickness of the torque support part is specifically designed to be substantial in the axial direction (except at the deformation portion), creating anisotropic mechanical properties that enable simultaneous torque transmission and vibration damping.
2Strength
If the torque support part is made rigid in circumferential direction for torque transmission, then torque transmission is maintained, but deformability in axial direction is reduced
Solution Approach 1:
The torque support part exhibits direction-dependent mechanical properties: high rigidity in the circumferential direction for torque transmission, while maintaining deformability in the axial direction through controlled wall thickness distribution, particularly with substantial thickness except at the deformation portion.
3Stability of the object's composition
If the wall thickness of torque support part is increased to improve rigidity, then structural stability is improved, but ease of deformation in axial direction is reduced
Solution Approach 1:
The wall thickness is non-uniformly distributed: substantial in most axial regions to provide structural stability, but reduced at the deformation portion to enable controlled deformation and vibration damping, achieving both stability and deformability.
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 ensures consistent torque transmission and effective vibration damping, maintaining the motor's performance even under axial and radial vibrations, enhancing the accuracy and reliability of the angle sensor.
Implementation Method 1
the deformation section, in particular in the assembled state, is elastically deformed in such a way that an axially directed elastic force presses the tab towards and/or into the recesses
Implementation Method 2
at least one area of a damping part is arranged between the strip section and the further strip section... vibrations that propagate from the engine via the fan cover to the sensor are damped
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An electric motor with a fan cowl and sensor, wherein the sensor has a shaft and a sensor housing, and the fan cowl has recesses. The sensor shaft is connected for conjoint rotation with the rotor shaft of the electric motor. A torque arm part (1) has a securing bracket (15), which is connected to, particularly screwed to, the sensor housing or to a further housing part which is screwed together therewith, particularly an adapter housing. The torque arm part (1) has a strip section (14), the first end region thereof is connected to the securing bracket (15) and the other end region thereof is connected to a deformation section (13). The torque arm part has a stiffening ring (10), to which a first end region of a further strip section (11) is connected. At least one lug (12) is arranged on the further strip section (11) and the other end region of the further strip section (11) is likewise connected to the deformation section (13). The deformation section, particularly in the mounted state, is elastically deformed in such a manner that an axially directed elastic force presses the lug (12) towards and/or into the recesses, and/or prior to the fitting of the torque arm part (1) the radial distance of the securing bracket (15), particularly the radial distance to the stiffening ring axis, differs from the radial distance of the securing bracket (15) in the mounted state of the torque arm part (1), particularly the radial distance to the stiffening ring axis, such that in the mounted state of the torque arm part (1) an axially directed elastic force presses the lug (12) towards and/or into the recesses.