Permanent Magnet Motor Segmented Flux Paths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing permanent magnet motors require multiple radial magnets, increasing cost and reducing magnetic pole included angle, leading to low output due to inefficient magnetic flux distribution and air gap coordination with d-axis and q-axis flux paths.
Innovation Solution
A permanent magnet motor design featuring alternately arranged circumferential and radial magnet placement slots with strategically positioned air gaps to optimize flux paths, allowing for adjustable magnet placement and reduced armature reaction, enhancing magnetic flux distribution and output performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two radial magnets are disposed between two adjacent magnetic poles, then the magnetic field is provided for single magnetic pole, but the cost is increased and the magnetic pole included angle is decreased
Solution Approach 1:
The rotor is segmented into multiple independent magnet placement slots (radial slots and circumferential slots) that can be selectively configured. This allows the magnetic circuit to be divided into multiple flux paths, enabling single radial magnet placement per pole while maintaining reliable magnetic field provision through the segmented flux paths.
Solution Approach 2:
The patent introduces circumferential magnet placement slots in addition to radial slots, adding a circumferential dimension to magnet placement. This dimensional expansion allows magnets to be positioned at different locations (radial vs. circumferential slots) to optimize flux paths without increasing the number of magnets per pole.
2Reliability
If two radial magnets are disposed between two adjacent magnetic poles, then the magnetic field is provided for single magnetic pole, but the magnetic pole included angle is decreased resulting in low output
Solution Approach 1:
The magnetic circuit is segmented into multiple independent flux paths through radial and circumferential slots. This segmentation allows each magnet to contribute to multiple flux paths simultaneously, maintaining reliable magnetic field provision while increasing the effective magnetic pole included angle and improving power output.
Solution Approach 2:
Each magnet placement slot (radial or circumferential) is designed to serve multiple functions: providing magnetic field, defining flux paths, and contributing to both d-axis and q-axis magnetic components. This multi-functionality allows single magnets to achieve reliable field provision while maximizing output through optimized flux distribution.
3Device complexity
If air gaps are introduced in the rotor, then the structure is modified, but the q-axis flux path is blocked and preferable speed and torque cannot be obtained simultaneously
Solution Approach 1:
The air gap structure is segmented and strategically positioned to create separate d-axis and q-axis flux paths. Radial air gaps are positioned to define d-axis flux paths while circumferential air gaps define q-axis flux paths, allowing both speed and torque requirements to be met simultaneously without blocking either flux path.
Solution Approach 2:
The patent uses both radial and circumferential air gaps, adding a circumferential dimension to air gap configuration. This multi-dimensional air gap arrangement allows independent control of d-axis and q-axis flux paths, enabling simultaneous optimization of speed and torque 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
The design achieves improved flux path planning, minimizing armature reaction and magnetic flux leakage, resulting in higher efficiency, stable operation, and adjustable performance for varying speed and torque requirements.
Implementation Method 1
Magnetic flux density and magnetizing direction on the d-axis and q-axis may be defined by placing the magnets with different materials in the circumferential and radial magnet placement slots
Implementation Method 2
The plurality of air gaps are adjacent to a part of the plurality of magnet placement slots and distributed to be on a d-axis flux path of the rotor
Implementation Method 3
The stator has a plurality of windings. The rotor has a plurality of magnet placement slots and a plurality of air gaps
Data Source
AI summary
A permanent magnet motor is provided, including: a stator and a rotor. The stator has a plurality of windings. The rotor has a plurality of magnet placement slots and a plurality of air gaps. The plurality of magnet placement slots include a plurality of circumferential magnet placement slots circumferentially arranged and a plurality of radial magnet placement slots radially extending. The circumferential magnet placement slots and the radial magnet placement slots are circumferentially alternately arranged. The plurality of air gaps are adjacent to part of the plurality of magnet placement slots and distributed to be on a d-axis flux path of the rotor.