Polymeric Industrial Electrical Machine Housing with Embedded Metallic Reinforcement
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Solution Overview
Problem
Existing electrical machines, particularly those used in industrial settings, face challenges in withstanding washdown procedures without corrosion or contamination, often requiring expensive stainless steel housings, and existing solutions do not adequately address the need for mechanical strength and thermal dissipation in harsh environments.
Innovation Solution
A polymeric industrial electrical machine with a polymeric housing made from materials like thermoplastics and composite materials, featuring a stator band and endplates that are overmolded with a metallic structure to enhance mechanical strength and stiffness, and a design that includes a labyrinth seal and ferrofluidic seal to prevent fluid ingress during washdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stainless steel housings are used to withstand washdown procedures without corrosion, then corrosion resistance is improved, but cost increases
Solution Approach 1:
The patent employs composite materials consisting of polymeric housing material reinforced with embedded metallic structures (such as steel or aluminum ribs, frames, or stiffeners). This composite construction provides the corrosion resistance and mechanical strength of metal while maintaining the cost benefits and chemical resistance of polymers, thereby resolving the contradiction between corrosion resistance and cost.
Solution Approach 2:
The patent applies local reinforcement by embedding metallic structures only in specific areas where mechanical strength is required (such as mounting flanges, bearing support areas, or structural ribs), rather than using solid metal throughout the entire housing. This localized approach provides necessary structural integrity while minimizing material cost and maintaining polymer housing benefits.
2Ease of manufacture
If polymeric housing is used to reduce cost, then cost decreases, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite structure where polymeric material is combined with embedded metallic reinforcement elements. The polymer provides the base structure and cost benefits, while the embedded metal ribs, frames, or stiffeners provide the necessary mechanical strength and stiffness, thus resolving the contradiction between cost and mechanical strength.
Solution Approach 2:
The patent reinforces the polymeric housing with metallic structures placed strategically in areas requiring high mechanical strength (such as mounting surfaces, bearing supports, and structural joints), while leaving other areas as simple polymer to maintain cost efficiency and chemical resistance.
3Ease of manufacture
If polymeric housing is used to reduce cost, then cost decreases, but stiffness deteriorates
Solution Approach 1:
The patent utilizes composite construction with polymeric base material and embedded metallic stiffening structures. The metallic elements act as internal reinforcement that significantly increases the housing's stiffness and rigidity without requiring solid metal construction, thereby resolving the contradiction between cost and stiffness.
Solution Approach 2:
The patent incorporates metallic reinforcement elements (ribs, frames, or stiffeners) at specific locations where structural stiffness is critical, such as mounting flanges, end plate attachments, and bearing support areas, while maintaining polymeric construction in other areas to preserve cost benefits.
Data Source
Figure 1~2
Figure 3
Figure 4A~4D
AI summary
An electrical machine comprises a polymeric housing (22) having a stator band (34), the polymeric housing (22) formed by a polymeric material and constructed to house components of the electrical machine, structurally support the electrical machine and react torque loads generated by the electrical machine; a stator (18, 30) overmolded into and partially encapsulated by the stator band (34), the stator (18, 30) including a laminated stator core (30) and a plurality of stator windings (20); a rotor (14) in magnetic communication with the stator (18, 30); a first endplate (36) integral with the polymeric housing (22); and a second endplate (38), the second endplate (38) being a polymeric endplate (36, 38), the second endplate (38) including a plurality of ribs (72) and a metallic structure (61), wherein the electrical machine is constructed as an industrial electrical machine.