Bent Magnet Slot Rotor Structure for Anti-Demagnetization
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Solution Overview
Problem
Existing rotor structures in permanent magnet synchronous reluctance motors suffer from poor anti-demagnetization ability, particularly when the number of poles is large, leading to significant demagnetization rates and unpractical structures.
Innovation Solution
A rotor structure with specific geometric configurations of permanent magnet slots, including outer and inner layers with bent slots and magnetic bridges, designed to guide demagnetization magnetic fields away from the permanent magnets, ensuring balanced magnetic field distribution and improved anti-demagnetization ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a rotor structure with permanent magnets and excitation windings is used to improve motor efficiency and power factor, then the motor performance is improved, but the rotor structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The rotor is divided into multiple magnetic pole pieces (N and S poles) arranged around the rotor core. Each pole piece can be independently manufactured and then assembled, simplifying the overall manufacturing process while maintaining the complex magnetic field structure required for high efficiency and power factor.
Solution Approach 2:
The excitation windings are embedded within slots in the rotor core, with permanent magnets positioned in specific relationships to these windings. This nested arrangement integrates multiple functional components (core, windings, magnets) into a compact structure that achieves high motor efficiency without proportionally increasing external dimensions or manufacturing complexity.
2Power
If conventional rotor structures without specific magnetic pole arrangements are used, then the manufacturing process is simpler, but the motor cannot achieve high efficiency and power factor in electric automobile applications
Solution Approach 1:
Different regions of the rotor are designed with different magnetic properties and structures. Specific pole pieces have optimized magnetic material distributions and winding configurations tailored to their local functional requirements, enabling high power factor and efficiency while allowing each local region to be manufactured using standardized processes.
Solution Approach 2:
The rotor employs composite construction combining ferromagnetic core materials, permanent magnetic materials, and copper windings. This composite structure achieves the sophisticated magnetic field distribution needed for high power factor while utilizing commercially available materials and manufacturing techniques for each component type.
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 proposed rotor structure effectively reduces the impact of demagnetization magnetic fields on the permanent magnets, enhancing the overall anti-demagnetization ability and maintaining inductance, thereby improving motor performance.
Implementation Method 1
a rotor structure for a permanent magnet assisted synchronous reluctance motor (PMAsynRM) comprising a rotor core (10), a plurality of excitation windings (20) provided on the rotor core (10), and a plurality of permanent magnets (30) provided on the rotor core (10)
Implementation Method 2
a plurality of excitation windings (20) provided on the rotor core (10)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure provides a rotor structure, a permanent magnet auxiliary synchronous reluctance motor and an electric vehicle. A rotor structure includes a rotor body, the rotor body being provided with magnetic steel slot groups, the magnetic steel slot groups each including an outer layer magnetic steel slot, and the outer layer magnetic steel slot including: a first outer layer magnetic steel slot segment; a second outer layer magnetic steel slot segment, the first outer layer magnetic steel slot segment and the second outer layer magnetic steel slot segment being arranged along a radial direction of the rotor body and being opposite to each other, extended lines of a length directional geometric centerline of the first outer layer magnetic steel slot segment and a length directional geometric centerline of the second outer layer magnetic steel slot segment defining a first angle; a first bent slot, the first bent slot being communicated with the first outer layer magnetic steel slot segment; a second bent slot, the second bent slot being communicated with the second outer layer magnetic steel slot segment, and extended lines of a length directional geometric centerline of the first bent slot and a length directional geometric centerline of the second bent slot defining a second angle, wherein the second angle is greater than the first angle. This arrangement improves the overall anti-demagnetization ability of the motor having the rotor structure.