Spoke-Plate Motor Rotor Layout for Higher Reluctance Torque
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Solution Overview
Problem
Axial flux motors have a low reluctance torque, leading to inadequate torque output capability and high costs due to the need for a large number of permanent magnets.
Innovation Solution
Incorporating a spoke plate with lower reluctance than air or permanent magnet material between adjacent permanent magnets in the motor rotor, increasing quadrature-axis inductance and reluctance torque, while reducing the number of permanent magnets required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large number of permanent magnets are used to increase torque output capability, then the torque output capability is improved, but the manufacturing cost increases
Solution Approach 1:
The invention changes the magnetic circuit parameters by introducing a spoke plate with specific magnetic conductivity between adjacent permanent magnets. This modifies the magnetic field distribution and increases reluctance torque without requiring additional permanent magnets, thereby resolving the contradiction between torque output capability and quantity of permanent magnets
Solution Approach 2:
The spoke plate acts as an intermediary element between adjacent permanent magnets, creating an additional magnetic conduction path. This intermediary structure enhances the magnetic circuit efficiency and increases reluctance torque, allowing reduced permanent magnet quantity while maintaining torque output capability
2Power
If the reluctance torque is increased by modifying the magnetic circuit, then the torque output capability is improved, but the device complexity increases
Solution Approach 1:
The spoke plate serves multiple functions simultaneously: it acts as a structural support element, provides a magnetic conduction path, and creates the necessary magnetic circuit geometry for increased reluctance torque. This multi-functionality avoids additional complexity while achieving improved torque output capability
Solution Approach 2:
The invention merges the spoke plate structure with the existing permanent magnet arrangement, combining structural support and magnetic circuit functions into a unified design. This integration increases reluctance torque without adding separate complex components, thereby resolving the contradiction between torque improvement and device complexity
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
Enhances torque output capability and reduces manufacturing costs by leveraging the reluctance torque, improving structural strength and stability of the motor rotor.
Implementation Method 1
Reluctance of the spoke plate is less than that of air, or reluctance of the spoke plate is less than that of a permanent magnet material
Data Source
AI summary
A motor rotor, a motor, and an electric vehicle are disclosed. The motor rotor includes an iron core yoke, a spoke plate, and at least two permanent magnets. The at least two permanent magnets are fastened to the iron core yoke and sequentially spaced apart in the circumferential direction. The spoke plate is located between adjacent permanent magnets. A quadrature-axis magnetic circuit is reserved between adjacent permanent magnets, and the spoke plate whose reluctance is less than that of air or the permanent magnet material is disposed on the quadrature-axis magnetic circuit, that is, the spoke plate is disposed between the adjacent permanent magnets. In this way, reluctance of the quadrature-axis magnetic circuit may be reduced, and quadrature-axis inductance may be increased. Accordingly, a reluctance torque is increased, and a torque output capability of the motor is improved.