Motor Control Unit Integration via Mid Shield for Heat Dissipation
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Solution Overview
Problem
Existing electronically commutated motors face challenges in heat dissipation and increased complexity and cost due to the need for separate compartments for electronic circuitry and end shields, which complicates servicing and increases costs.
Innovation Solution
A mid shield is introduced, featuring a circular center section with leg portions and enclosure engaging members, allowing the motor control unit to be integrated within the motor enclosure without disturbing the winding assembly, providing a one-piece enclosure configuration that maintains alignment and symmetry, and allows for easy replacement of the motor control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electronic circuitry is attached to a heat sink and positioned adjacent an outer wall or surface of an end shield, then heat dissipation is promoted, but device complexity and cost increase due to needing another compartment to protect the electronic circuitry
Solution Approach 1:
The patent merges the end shield and motor control unit housing into a single integrated structure. The end shield serves dual purposes: as a structural component of the motor enclosure and as the housing for the motor control unit. This eliminates the need for separate compartments while maintaining heat dissipation functionality through the integrated heat sink attachment to the end shield.
2Temperature
If the electronic circuitry is attached to a heat sink and positioned adjacent an outer wall or surface of an end shield, then heat dissipation is promoted, but manufacturing cost increases
Solution Approach 1:
The integration of the end shield and motor control unit housing reduces the total number of parts that need to be manufactured, assembled, and sealed. This consolidation decreases manufacturing complexity and associated costs while maintaining the heat dissipation function through the heat sink attached to the integrated structure.
3Ease of repair
If the end shield is removed for servicing, then access to electronic circuitry is gained, but the windings and rotating shaft become free to move about the motor enclosure
Solution Approach 1:
The patent segments the motor control unit from the motor enclosure by providing it with a separate access cover that can be removed independently. This allows servicing of the electronic circuitry without removing the end shield, thereby maintaining the positional stability of the windings and rotating shaft within the motor enclosure.
4Reliability
If a separate compartment is added to protect the electronic circuitry, then protection is improved, but device complexity and cost increase
Solution Approach 1:
The end shield is designed to serve as both a motor enclosure component and the protective housing for the motor control unit. This merged structure provides the necessary protection for the electronic circuitry while avoiding the added complexity of a separate compartment. The integrated design maintains structural efficiency and reduces assembly complexity.
Data Source
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AI summary
An electric motor includes a motor enclosure, a motor-bearing assembly, a motor control unit, a mid shield, and a bearing. The motor-bearing assembly is configured for placement within the motor enclosure and has a shaft extending therefrom. A portion of the motor control unit is configured for placement within the motor enclosure. The mid shield is configured for placement within the motor enclosure between the motor control unit and the motor-bearing assembly and further configured to engage the shaft. The bearing is configured to seat within the mid shield and provide at least a portion of the engagement between the shaft and the mid shield.