Universal Rotor Assembly for Multi-Size Electric Motors
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Solution Overview
Problem
The high cost and complexity of manufacturing multiple motor sizes with different components and tooling lead to increased costs and inefficiencies in motor production, as each size requires separate components and tooling, necessitating a method to reduce costs while minimizing design compromises.
Innovation Solution
A method and kit for fabricating electric motors that utilize common components and tooling for different sizes by selecting and assembling rotor and stator parts to achieve desired frame sizes, such as NEMA standards, using common rotor and stator diameters to share tooling and minimize additional costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate components and tooling are used for each motor size, then manufacturing precision and reliability are maintained, but device complexity and manufacturing cost increase substantially
Solution Approach 1:
The patent applies universality by designing a common rotor assembly that can be used across multiple motor sizes. The rotor assembly including the rotor core, permanent magnets, and retaining covering is configured to fit different stator assemblies, allowing one rotor design to serve multiple motor frame sizes (e.g., NEMA 42, 48, 56). This reduces the number of unique components and tooling required while maintaining manufacturing precision through standardized interfaces and dimensions.
2Manufacturing precision
If separate tooling is used for each motor size, then manufacturing precision is maintained, but productivity decreases due to multiple manufacturing lots
Solution Approach 1:
The patent merges the rotor components (rotor core, permanent magnets, retaining covering) into a single integrated rotor assembly that can be manufactured as one unit. This consolidation allows the rotor to be produced in larger batches that can serve multiple motor sizes, reducing the number of separate manufacturing lots and tooling changes required. The standardized rotor assembly can be stored and distributed to different assembly lines, improving overall manufacturing efficiency while maintaining precision through consistent design specifications.
3Reliability
If separate components are manufactured for each motor size, then reliability is improved through optimized design, but loss of substance increases due to higher inventory requirements
Solution Approach 1:
By designing a universal rotor assembly that can be used across multiple motor sizes, the patent reduces the total inventory of unique components needed. Instead of maintaining separate inventories of rotor cores, magnets, and retaining coverings for each motor size, a single inventory of standardized rotor assemblies can serve multiple product lines. This reduces material waste and inventory carrying costs while maintaining reliability through consistent quality standards applied to the universal design.
Data Source
AI summary
A method for fabricating a rotor for an electric motor is provided. The method includes the steps of fabricating a first set of rotor parts for use in a motor having a first frame size and fabricating a second set of rotor parts for use in a motor having a second frame size. The second frame size is substantially different from the first frame size. The method further includes the steps of fabricating a third set of rotor parts for use in the motor having the first frame size and for use in the motor having the second frame size, ascertaining the desired motor frame size, and selecting one of the first set of rotor parts and the second set of rotor parts in accordance with desired motor frame size. The method also includes the steps of selecting the third set of rotor parts and assembling a rotor with one of the first set of rotor parts and the second set of rotor parts and with the third set of rotor parts, such that a rotor for use with the desired motor frame size is substantially provided.