Slanted Permanent Magnet Rotor for Compact Electric Machine Design
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Solution Overview
Problem
Electric machines with rotors having permanent magnets often have a larger diameter than desired due to conventional magnet configurations, which can affect the rotor's magnetic field strength and structural integrity.
Innovation Solution
The electric machine features a rotor with an annularly-shaped rotor body and permanently fixed permanent magnets positioned at angles between 15° and 75° relative to the radial axis, allowing for a smaller diameter while maintaining a strong and symmetric magnetic field, achieved through segmentation and specific magnet positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional permanent magnet configurations are used in the rotor, then the rotor can maintain adequate magnetic field strength, but the rotor diameter becomes larger than desired
Solution Approach 1:
The patent transitions from conventional radial magnetization to slanted magnetization where the magnetic dipole axis is oriented at an angle between 15° and 75° relative to the radial direction. This angular reorientation in a new dimensional configuration allows the magnetic field to be more effectively utilized within a smaller rotor diameter, resolving the contradiction between compact size and magnetic field strength
Solution Approach 2:
The patent changes the magnetization angle parameter from the conventional radial orientation (0°) to a slanted orientation (15°-75°). This parameter modification optimizes the magnetic field distribution and interaction with stator poles, enabling reduced rotor diameter while maintaining or improving power output
2Strength
If conventional permanent magnet configurations are used in the rotor, then the rotor can be structurally simple, but the structural integrity and vibration performance deteriorate
Solution Approach 1:
The rotor is divided into multiple identical magnet assemblies arranged symmetrically around the rotor circumference. Each assembly contains permanent magnets with slanted dipole axes. This segmentation allows for modular construction, balanced weight distribution, and reduced vibrations while maintaining structural integrity without excessive 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
This configuration enables the electric machine to generate equal or greater power compared to prior art machines with larger rotors, while reducing vibrations and improving structural integrity, allowing for a more compact design.
Implementation Method 1
Each of the plurality of permanent magnets creates a magnetic dipole. Each magnetic dipole extends along a dipole axis that passes through the respective permanent magnet.
Data Source
AI summary
An electric machine including a rotor and an annularly-shaped first stator is provided. The rotor includes an annularly-shaped rotor body and permanent magnets positionally-fixed relative to the rotor body. The first stator includes circumferentially-spaced stator poles. The rotor and the first stator are concentric and axially-aligned relative to an axial centerline of the electric machine. Each of the permanent magnets creates a magnetic dipole. Each magnetic dipole extends along a dipole axis that passes through the respective permanent magnet. Each dipole axis extends in a first plane. The centerline of the electric machine extends in a second plane that is at least substantially perpendicular to the first plane. Each of the permanent magnets is positioned so that a magnet angle that is between 15° and 75° is defined between the respective dipole axis and a radial axis that extends between the respective permanent magnet and the centerline.