Stacked Claw Rotor Motor for Lundell Output and Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lundell-type rotor motors have limitations in terms of output and assembly properties, requiring improvements for enhanced performance.
Innovation Solution
The design includes four stacked rotor cores with field magnets interposed between them, and four stacked stator cores with annular windings, where claw-shaped magnetic poles are arranged at equal intervals and magnetized to optimize magnetic flux distribution, allowing for improved magnetic flux density uniformity and increased output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a Lundell type rotor structure is used, then the motor can operate with a simple structure, but the output and assembling properties are insufficient
Solution Approach 1:
The rotor core is divided into multiple claw-shaped magnetic poles that are segmented and arranged radially around the circumference. Each claw-shaped pole is a separate magnetic element that can be independently positioned and assembled, allowing for improved assembling properties while maintaining the motor's output through the collective arrangement of multiple poles
Solution Approach 2:
The invention transitions from a traditional two-dimensional winding structure to a three-dimensional claw-shaped magnetic pole structure that extends radially and axially. This dimensional change allows magnetic flux to be generated through the shape and arrangement of the claws themselves rather than requiring complex windings, thereby improving both output and assembly simplicity
2Power
If the number of magnetic poles is increased to improve output, then the motor power increases, but the magnetic flux density distribution becomes non-uniform
Solution Approach 1:
Each claw-shaped magnetic pole is designed with specific local geometric characteristics, including optimized claw width, length, and curvature radius. These local quality parameters are carefully controlled to ensure that each pole generates a consistent and uniform magnetic flux density distribution, allowing multiple poles to be arranged around the circumference without compromising overall uniformity
Solution Approach 2:
The invention optimizes key geometric parameters of the claw-shaped poles, such as the ratio of claw width to pole pitch, the axial length of claws, and the curvature radius of claw tips. By adjusting these parameters within specific ranges, the magnetic flux density distribution is maintained as uniform as possible even when the number of poles is increased to boost output
3Power
If traditional rotor structures are used, then the design is simple, but the assembling properties and output cannot be improved simultaneously
Solution Approach 1:
The invention merges the functions of traditional windings, magnetic poles, and core structures into a single integrated claw-shaped magnetic pole assembly. This combining of multiple functional elements into one unified structure simplifies the overall device complexity while enabling improved output through optimized magnetic flux paths generated by the claw geometry
Solution Approach 2:
The claw-shaped magnetic poles serve multiple functions simultaneously: they act as magnetic flux conduits, provide structural support for the rotor assembly, and enable the motor's electromagnetic conversion function. This multi-functionality reduces the need for separate components, improving assembling properties while maintaining high output capability
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
This configuration enhances the motor's output by providing a uniform magnetic flux density distribution, leading to increased efficiency and easier assembly due to the use of symmetrical components.
Implementation Method 1
The plurality of field magnets are magnetized in the axial direction such that the field magnets cause the first and third rotor-side claw-shaped magnetic poles to function as first magnetic poles, and cause the second and fourth rotor-side claw-shaped magnetic poles to function as second magnetic poles
Implementation Method 2
Directions of AC current flowing through the plurality of annular windings are different from one another such that a variation cycle of magnetic fluxes from the first and third stator-side claw-shaped magnetic poles and a variation cycle of magnetic fluxes from the second and fourth stator-side claw-shaped magnetic poles are deviated from each other in phase by 180°
Data Source
AI summary
A rotor with four axially stacked rotor cores, and a plurality of field magnets interposed between them. Each rotor core includes a rotor-side claw-shaped magnetic pole. Each rotor-side claw-shaped magnetic poles are respectively extending from and formed on each rotor core at equal angle intervals. Tip end surfaces of the first and third rotor-side claw-shaped magnetic pole abut against or are closely opposed to each other axially. Tip end surfaces of the second and fourth rotor-side claw-shaped magnetic poles abut against or are closely opposed to each other in the axial direction. The plurality of field magnets are magnetized in the axial direction such that the field magnets causes the first and third rotor-side claw-shaped magnetic poles to function as first magnetic poles, and cause the second and fourth rotor-side claw-shaped magnetic poles to function as second magnetic poles.