External Rotor Motor with Inverted Structure for Direct Inner Rotor Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric appliances primarily use inner rotor motors, which are structurally and installation-wise different from external rotor motors, necessitating a novel external rotor motor that can directly replace inner rotor motors without altering installation methods to enhance product performance.
Innovation Solution
An external rotor motor design comprising a front end cover, rear end cover, sleeve casing, rotary shaft, stator assembly, and external rotor assembly, with integrated bearings, a plastic-packaged stator assembly, and air blades for improved cooling, allowing direct substitution of inner rotor motors with simple and stable installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external rotor motors are used to replace inner rotor motors, then product performance is improved, but installation compatibility is lost
Solution Approach 1:
The patent inverts the conventional motor structure by placing the rotor outside the stator, creating an external rotor motor that maintains the same installation interface as traditional inner rotor motors. This inversion allows the motor to deliver improved performance while maintaining compatibility with existing appliance installations.
Solution Approach 2:
The motor design achieves universality by making the external rotor motor compatible with both external rotor and inner rotor motor installation positions. The standardized installation interface allows the same motor design to replace different types of motors across various appliance applications.
2Reliability
If external rotor motors are designed with different structure from inner rotor motors, then performance is improved, but installation complexity increases
Solution Approach 1:
By inverting the rotor-stator configuration while maintaining standardized installation dimensions and mounting interfaces, the patent achieves improved performance without increasing installation complexity. The external rotor structure is designed to fit existing installation spaces.
Solution Approach 2:
The motor is divided into distinct modular components including the external rotor assembly, stator assembly, and installation interface, allowing for simplified assembly and maintenance while maintaining overall structural integrity and performance.
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
Enables convenient installation, enhances product performance, improves cooling efficiency, and maintains motor stability, allowing the external rotor motor to replace inner rotor motors effectively in conventional electric appliances.
Implementation Method 1
The external rotor assembly comprises a sleeve and a plurality of permanent magnets; the plurality of permanent magnets is circumferentially disposed on the side wall
Implementation Method 2
the external rotor assembly comprises air blades
Data Source
AI summary
An external rotor motor, including: a front end cover; a rear end cover; a sleeve casing; a rotary shaft; a stator assembly; and an external rotor assembly. The front end cover includes a first bearing chamber in which a front bearing is disposed. The front end cover and the rear end cover are disposed at two ends of the sleeve casing, respectively. The external rotor assembly is disposed on and integrated with the rotary shaft. The rear end cover includes a cover body and a sleeve base. The sleeve base includes a second bearing chamber in which a rear bearing is disposed. The external rotor assembly is disposed in the sleeve casing and sleeves the stator assembly. The rotary shaft includes a head, a middle part, and a tail. The tail of the rotary shaft is supported by the rear bearing on the rear end cover.