Electric Motor Rotor Coil Support Structure
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Solution Overview
Problem
Conventional electric motors face issues with rotor coil short-circuits due to centrifugal forces during rotation and inadequate cooling, leading to reduced performance and output.
Innovation Solution
The electric motor incorporates coil supporting members with a hub, radial spokes, and reinforcing members to prevent rotor coil separation and enhance cooling by using materials with higher heat transfer performance, such as aluminum, and integrating insulation-coated non-magnetic metallic members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor rotates at high speed, then the motor output is improved, but the rotor coil may separate from the rotor core due to centrifugal force causing short-circuit
Solution Approach 1:
The coil supporting member is pre-installed on the rotor core before the rotor coil is wound. This preliminary action creates a mechanical constraint structure that prevents the rotor coil from separating due to centrifugal force during high-speed rotation, thereby maintaining reliability while enabling high power output.
Solution Approach 2:
The coil supporting member acts as an intermediary element between the rotor core and the rotor coil. It provides mechanical support and constraint to the rotor coil, preventing separation while allowing the rotor to rotate at high speeds for improved motor output.
2Temperature
If the rotor coil has large contact area with air for cooling, then heat dissipation is improved, but the rotor coil structure becomes complex and more prone to short-circuit
Solution Approach 1:
The coil supporting member serves multiple functions simultaneously: it provides mechanical support to prevent rotor coil separation, maintains the rotor coil's positional stability, and acts as a heat dissipation structure through its exposure to air flow. This multi-functionality improves cooling without significantly increasing structural complexity.
Solution Approach 2:
The coil supporting member's structure allows it to automatically serve as a heat dissipation element during rotor rotation. The rotational motion itself generates air flow that cools the coil supporting member and the rotor coil, eliminating the need for additional active cooling mechanisms.
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
Prevents rotor coil short-circuits and improves cooling efficiency, ensuring stable operation and prolonged lifespan by maintaining the rotor coil's position and effectively transferring heat away from the rotor core.
Implementation Method 1
configured to support the rotor coil such that the rotor coil is prevented from being separated from the rotor core in a radial direction when the rotor rotates
Implementation Method 2
capable of enhancing a cooling performance of the rotor coil... effectively transferring heat away from the rotor core
Data Source
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AI summary
An electric motor includes a stator; and a rotor disposed so as to be rotatable with respect to the stator, wherein the rotor includes: a rotor core having a plurality of poles and slots; a shaft coupled to a central portion of the rotor core; a rotor coil wound on the rotor core; and coil supporting members provided at the rotor core, and configured to support the rotor coil such that the rotor coil is prevented from being separated from the rotor core in a radial direction when the rotor rotates. Under such configuration, a short-circuit of the rotor coil due to a centrifugal force when the rotor rotates, can be prevented.