IPM Motor Rotor Multi-Layer Magnet Design
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Solution Overview
Problem
The performance of Interior Permanent Magnet (IPM) Synchronous Motors is limited by the reliance on rare earth permanent magnets, which are non-renewable and expensive, and increasing their efficiency beyond current methods is challenging.
Innovation Solution
A motor rotor design with an iron core and arc-shaped permanent magnets distributed in circumferentially mounted slots, optimizing the thickness and distance relationships between magnets to enhance reluctance torque, reducing the need for rare earth magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rare earth permanent magnets are used to improve motor efficiency, then the permanent magnetic torque increases, but the cost increases and resource consumption increases
Solution Approach 1:
The patent changes the geometric parameters of permanent magnets (thickness, arc shape, distribution pattern) to optimize the ratio between permanent magnetic torque and reluctance torque. By adjusting the thickness of permanent magnets in different radial positions and creating multi-layer distributions, the design maximizes efficiency while reducing the quantity of rare earth materials needed.
Solution Approach 2:
The patent divides the rotor structure into multiple layers with permanent magnets distributed at different radial positions. Instead of using a single thick layer of permanent magnets, the design segments them into multiple thinner layers, which optimizes the magnetic field distribution and increases reluctance torque contribution, thereby reducing overall permanent magnet consumption.
2Power
If more permanent magnets are used to increase output torque, then the motor performance improves, but the cost and resource consumption increase
Solution Approach 1:
The patent creates a composite magnetic circuit structure combining permanent magnets with ferromagnetic materials in a multi-layer configuration. This composite design allows the ferromagnetic portions to contribute to the magnetic circuit, reducing the burden on permanent magnets and enabling higher output torque with less permanent magnet material.
Solution Approach 2:
The patent transitions from a single-plane permanent magnet arrangement to a multi-layer radial distribution. By utilizing the radial dimension to create multiple layers at different positions, the design increases the effective magnetic path and enhances both permanent magnetic torque and reluctance torque without proportionally increasing permanent magnet quantity.
3Loss of energy
If the performance of permanent magnets is improved to increase composite torque, then motor efficiency improves, but the reliance on non-renewable resources increases
Solution Approach 1:
The patent applies different thicknesses and configurations of permanent magnets at different radial positions within the rotor. By optimizing the local properties of permanent magnets in specific regions rather than uniformly across the entire rotor, the design achieves high efficiency while using less total permanent magnet material, thereby reducing dependence on rare earth resources.
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 design increases the motor's output torque and efficiency by maximizing reluctance torque, reducing rare earth magnet consumption, saving resources, and lowering production costs while minimizing environmental impact.
Implementation Method 1
An Interior Permanent Magnet (IPM) Synchronous Motor is a motor, in which a layer of permanent magnets are provided inside the rotor, and which mainly uses permanent magnetic torque, assisted with reluctance torque
Implementation Method 2
the performance of the motor can be improved by increasing the value of T; the first term, after T in the equation, is the reluctance torque
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Disclosed is a motor rotor, comprising an iron core (10) and permanent magnets (20) provided inside the iron core (10). A plurality of sets of mounting slots (30) are circumferentially distributed in the iron core (10). Each set of mounting slots (30) comprises two or more layers of mounting slots (30) provided at intervals in the radial direction of the iron core (10). There are a plurality of sets of permanent magnets (20), and the permanent magnets (20) of each set of permanent magnets (20) are correspondingly embedded into the mounting slots (30) of each set of mounting slots. Also disclosed is a motor, comprising the motor rotor described above. Through increasing the reluctance torque of the motor rotor, the output torque of the motor is increased and the efficiency of the motor is improved.