Synchronous Reluctance Motor Rotor Layout for Low Torque Ripple
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current induction motors, particularly those below 30 horsepower, face high investment costs due to numerous models and lack of high-efficiency designs, leading to inefficiencies and environmental impact, with small and medium-sized manufacturers struggling to meet international energy efficiency regulations.
Innovation Solution
A synchronous reluctance motor design featuring a four-pole rotor and shared stator with an induction motor, utilizing specific geometric relationships between stator and rotor components to reduce development costs and enhance efficiency, power density, and torque ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If induction motors below 30HP are produced in multiple models (two-pole/four-pole/six-pole), then market coverage is improved, but investment cost of tools and dies increases significantly
Solution Approach 1:
The patent applies universality by designing a four-pole synchronous reluctance motor stator that can be shared with induction motors, creating a common platform that serves multiple functions. This allows the same stator structure to be used across different motor types and power ratings, eliminating the need for separate tooling and dies for each model variant.
Solution Approach 2:
The patent utilizes parameter changes by maintaining a fixed four-pole configuration and standardized stator design while varying only the rotor parameters and magnetic channel dimensions to achieve different performance requirements. This approach allows market coverage across multiple applications without requiring changes to the fundamental stator structure or tooling.
2Reliability
If traditional rotor designs with aluminum or copper die-casting are used, then magnetic performance is improved, but material usage and environmental impact increase
Solution Approach 1:
The patent extracts and eliminates the heavy metal die-casting materials (aluminum or copper) from the rotor structure. Instead of using these materials to create rotor bars or windings, the design relies on the magnetic properties of the rotor core itself and the arranged magnetic channels to achieve the required magnetic performance, thereby removing unnecessary material usage and associated environmental impacts.
Solution Approach 2:
The patent applies local quality by concentrating magnetic flux guidance in specific localized regions through the arranged magnetic channels within the rotor core. Rather than using bulk magnetic materials throughout the rotor, the design creates localized high-performance magnetic pathways where needed, achieving effective magnetic performance with minimal material usage.
3Ease of manufacture
If conventional synchronous reluctance motor designs are used, then manufacturing simplicity is improved, but torque ripple is high limiting application scope
Solution Approach 1:
The patent applies local quality by creating non-uniform magnetic channel dimensions within the rotor structure. The magnetic channels have varying widths and spacing arranged in a specific pattern, which locally modifies the magnetic flux distribution to smooth out torque variations. This localized structural variation reduces torque ripple while maintaining the overall simplicity of the synchronous reluctance motor manufacturing process.
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
The design reduces material usage, simplifies recycling, and enhances energy efficiency, enabling high-efficiency motors with low torque ripple suitable for high-level servo motion control and speed regulation applications.
Implementation Method 1
a rotor, comprising a plurality of motor poles, each of the motor poles comprising a plurality of rotor barriers and a plurality of magnetic channels, the magnetic channels comprising a first magnetic channel to an n-th magnetic channel
Implementation Method 2
A synchronous reluctance motor, comprising: a stator, comprising a plurality of stator slots, a plurality of stator teeth, and a stator edge... and a rotor, comprising a plurality of motor poles
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a synchronous reluctance motor, comprising: a stator including a plurality of stator slots, a plurality of stator teeth, a stator edge, and a stator yoke width (Wy); and a rotor including a plurality of motor poles, each motor pole includes a plurality of rotor barriers and the first to n-th magnetic channels. The first magnetic channel includes the first magnetic channel width (W1), the n-th magnetic channel includes the n-th magnetic channel width (Wn), n is a positive integer greater than 1, wherein, each motor poles includes a sum of the widths of the plurality of magnetic channels (ΣW). The formula for ΣW is ∑W=W12+ W2 + ··· + Wn-1 + Wn , wherein, the relationship between ΣW and the width of the stator yoke (Wy) is: 0.7≤∑WWy≤1.3. Furthermore, the present invention also provides a design method of a synchronous reluctance motor.