Pump Rotor Segmented Driver for Torque Transmission
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Solution Overview
Problem
Existing pump designs with small but powerful electric motors face challenges in maintaining torque transmission due to adhesive bond fatigue and corrosion issues, requiring high-quality and expensive bonding, and complex balancing processes that can lead to reduced service life and increased production complexity.
Innovation Solution
A rotor design where the magnet is positively connected to the shaft using a driver with projections or recesses, surrounded by a rotor shell, and equipped with a separate balancing element made of stainless steel to prevent corrosion and simplify assembly, allowing for a compact, high-performance, and long-lasting pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If adhesive bonding is used to connect magnet to shaft, then compact design is achieved, but torque transmission reliability deteriorates due to adhesive bond fatigue
Solution Approach 1:
The rotor is divided into distinct components: shaft, driver element, and magnet. The driver element acts as an intermediate segment that provides both mechanical connection and balancing functionality, eliminating the need for adhesive bonding while maintaining compact dimensions.
Solution Approach 2:
The driver element serves as an intermediary component between the shaft and magnet. It provides form-fitting connections to both components, enabling reliable torque transmission without adhesive bonds while also serving as the location for balancing elements.
2Stability of the object's composition
If balancing holes are drilled into the magnet, then rotor balancing is achieved, but corrosion resistance deteriorates due to corrosion processes affecting the entire magnet
Solution Approach 1:
The balancing function is extracted from the magnet component and relocated to the driver element. Balancing elements are attached to the driver element instead of drilling holes in the magnet, preserving the magnet's integrity and corrosion resistance while achieving rotor balance.
Solution Approach 2:
The driver element acts as an intermediary that carries balancing elements, separating the balancing function from the magnet. This prevents corrosion from affecting the magnet while still achieving the necessary rotor balance through the driver element.
3Reliability
If high-quality adhesive bonding is used to ensure torque transmission, then torque transmission reliability is improved, but manufacturing cost increases
Solution Approach 1:
The rotor is segmented into shaft, driver element, and magnet components connected through form-fitting mechanical interfaces. This eliminates the need for expensive high-quality adhesive bonds while maintaining reliable torque transmission through precise geometric connections.
Solution Approach 2:
The driver element serves as a cost-effective intermediary that provides mechanical connection between shaft and magnet through form-fitting interfaces, eliminating the need for expensive adhesive bonding while ensuring reliable torque transmission.
4Manufacturing precision
If multiple work steps are used to produce rotor with permanent magnets fixed by bandage and end caps, then rotor assembly precision is improved, but production complexity increases
Solution Approach 1:
The driver element combines multiple functions into a single component: mechanical connection to shaft, support for magnet assembly, and carrier for balancing elements. This merging reduces the number of separate work steps and components while maintaining assembly precision through integrated form-fitting connections.
Solution Approach 2:
The driver element is designed as a multi-functional component that provides mechanical coupling, structural support, and balancing functionality. This universality simplifies production by eliminating the need for separate bandage and end cap components, reducing overall production complexity while maintaining precision.
Data Source
Figure 1~C
Figure 3a~3f
Figure 4a~5e
AI summary
The invention relates to a pump with an electric motor comprising a rotor containing a shaft (1) and a magnet surrounding the shaft, wherein the magnet is positively connected to the shaft (1). In particular, the magnet segments (5) are connected to at least one end cap (8) to form a magnet assembly (6). The rotor can have at least one balancing element (9) on its end face for providing balancing bore(s).