Rotor Magnet Layout for Higher Torque and Easier Magnetization
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Solution Overview
Problem
Rotating electrical machines with arc-shaped magnetic paths face challenges in enhancing output torque and magnet production ease.
Innovation Solution
The rotating electrical machine incorporates a magnet unit with alternating magnetic poles, linearly parallel easy axes of magnetization, and a rotor design that enhances magnetic flux density near the d-axis, using discrete magnets with higher back electromotive force constants, and includes chamfered corners to facilitate demagnetization and reduce material volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnets are designed with arc-shaped magnetic paths to enhance torque output, then the density of magnetic flux around the d-axis is improved, but the ease of magnet production deteriorates
Solution Approach 1:
Instead of bending the magnetic path into an arc shape, the patent inverts the approach by using linearly parallel easy axes of magnetization that extend radially outward from the rotor center. This inversion maintains the beneficial effect of concentrated magnetic flux near the d-axis while using straightforward linear magnetization directions that are easier to manufacture.
Solution Approach 2:
The patent changes the magnetization direction parameter from arc-shaped orientations to linearly parallel orientations that extend radially. This parameter change allows the magnetic flux density near the d-axis to be enhanced through proper magnet arrangement and linear magnetization, avoiding the complexity of creating arc-shaped magnetic paths while maintaining high torque output.
2Power
If magnets are oriented with arc-shaped easy axes of magnetization to concentrate magnetic flux, then torque output is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent inverts the conventional arc-shaped magnetization approach by using linearly parallel easy axes that extend radially. This inversion achieves concentrated magnetic flux near the d-axis through proper magnet placement and linear orientation, significantly reducing the complexity of magnet fabrication and assembly while maintaining enhanced torque output.
Solution Approach 2:
The patent applies local quality by orienting the easy axes of magnetization radially outward from the rotor center, creating localized concentration of magnetic flux near the d-axis where it is most effective for torque generation. This localized approach achieves high torque output without requiring complex arc-shaped orientations across the entire magnet structure.
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 torque output and simplifies magnet production by optimizing magnetic flux distribution and reducing material requirements.
Implementation Method 1
a magnet unit which is equipped with a plurality of magnetic poles whose polarities alternate in a circumferential direction of the magnet unit
Implementation Method 2
The easy axes of magnetization define a plurality of magnetic paths extending therealong
Implementation Method 3
The magnets of the magnet unit are configured to have a back electromotive force constant
Data Source
AI summary
A rotating electrical machine equipped with a magnetic field-producing unit which includes a magnet unit having magnets each of which has easy axes of magnetization oriented to extend linearly parallel to each other and defines a plurality of magnetic paths along the easy axes of magnetization. The magnets are discrete from each other through a d-axis defined on the center of the magnetic pole and a q-axis defined on a magnetic boundary between the magnetic poles. The magnets are configured to have a back electromotive force constant which is higher than that of parallel-oriented magnets when an angle of rotation of the rotor lies in a first angle range including the gravity center of the magnets. The parallel-oriented magnets are designed to have magnetic paths which are different from those of the magnets of the magnet unit and oriented along easy axes of magnetization extending linearly parallel to the d-axis.