Electric Compressor Active Vibration Control Without Cooling Loss
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Solution Overview
Problem
Existing vibration/noise reduction methods for electric compressors, which involve installing a damping member between the stator and housing to reduce stator vibrations, hinder heat transfer and cooling of the stator, potentially leading to overheating of components with low heat resistance.
Innovation Solution
A vibration/noise reduction device that detects the frequency of stator vibrations and generates a vibration signal with a frequency that is an integral multiple of the electrical angle frequency, allowing for cancellation of stator vibrations without the need for a damping member, thereby maintaining stator coolability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a damping member is installed between the stator and housing to reduce stator vibrations, then vibration/noise is reduced, but heat transfer and cooling of the stator are hindered
Solution Approach 1:
The patent replaces the mechanical damping member with an active vibration control system using exciters and sensors. The exciters generate counter-vibrations to cancel stator vibrations, eliminating the need for physical damping materials that would block heat transfer paths between the stator and housing.
Solution Approach 2:
The patent introduces exciters as intermediary devices that generate opposing vibrations to cancel the harmful stator vibrations. These exciters are mounted on the housing and create counter-frequency vibrations that neutralize the stator's vibration without requiring direct contact with the stator, thus preserving thermal pathways.
2Object-generated harmful factors
If a damping member is installed to reduce stator vibrations, then vibration/noise is reduced, but heat may be transmitted to bearing and other low heat resistance components
Solution Approach 1:
The active vibration control system replaces passive damping members, eliminating the thermal insulation effect that would redirect heat toward bearings. The housing remains thermally conductive, allowing heat to flow naturally away from the stator without being funneled toward heat-sensitive components.
Solution Approach 2:
The housing serves dual functions: as a structural support and as a heat dissipation path. By removing damping members that would interfere with thermal flow, the housing's inherent thermal conductivity is utilized to manage stator heat, preventing it from concentrating on bearings and other low heat resistance components.
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 effectively reduces stator-induced vibrations and noise in electric compressors without impairing the coolability of the stator, allowing for improved heat transfer and reduced risk of overheating.
Implementation Method 1
a detector for detecting a frequency related to a vibration of the stator
Implementation Method 2
generating a vibration signal that is a predetermined integral multiple of an electrical angle frequency obtained from the frequency related to the vibration of the stator and has a signal wave canceling the vibration of the stator
Data Source
AI summary
With an electric compressor including a rotational shaft, a compressor wheel disposed on the rotational shaft, and an electric motor for applying a rotational force to the rotational shaft including a rotor fixed to the rotational shaft, and a stator disposed around the rotor, for applying the rotational force to the rotor by an electromagnetic force, a vibration/noise reduction device includes a detector for detecting a frequency related to a vibration of the stator, and a signal generator for generating a vibration signal that has a frequency of a predetermined integral multiple of an electrical angle frequency, which is obtained from the frequency detected by the detector, and has a signal wave attenuating the vibration of the stator, and a vibrator for vibrating the electric compressor based on the vibration signal.