V-Shaped Permanent Magnet Rotor for High-Speed Torque Density
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Solution Overview
Problem
Existing rotors of permanently excited synchronous machines face challenges in achieving high maximum speeds, high torque, and high power while maintaining a compact design, particularly in high-performance vehicles.
Innovation Solution
A rotor design featuring radially outwardly open pocket-like recesses with permanent magnets arranged in a V-shape and chamfered ends to increase magnetic mass and torque, supported by a drum on the outer circumference, allowing for increased power and torque density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If permanent magnets are arranged in radially outwardly closed recesses, then the rotor structure is simplified and manufacturing is easier, but the magnetic mass and torque density are reduced
Solution Approach 1:
The patent inverts the conventional closed recess design by using radially outwardly open pocket-like recesses. This inversion allows the permanent magnets to be arranged in a V-shape with chamfered outer surfaces, increasing the effective magnetic mass while maintaining manufacturing simplicity through the open recess structure that facilitates magnet insertion.
Solution Approach 2:
The patent transitions from a conventional radial arrangement to a V-shaped arrangement with chamfered surfaces. The chamfers extend in the tangential direction, adding a dimensional component to the magnet geometry that increases the magnetic mass per pole without significantly increasing the rotor radius, thereby enhancing torque density.
2Power
If the rotor size is increased to provide high torque and power, then the torque density improves, but the installation space requirement increases
Solution Approach 1:
The patent changes the geometric parameters of the permanent magnet arrangement by using V-shaped recesses with chamfered outer surfaces. The chamfers extend in the tangential direction, optimizing the magnetic mass distribution within the available rotor volume. This parameter optimization increases power output without proportionally increasing the rotor's external dimensions.
3Speed
If the maximum speed is increased to improve performance, then the power capability improves, but the centrifugal forces and structural stability deteriorate
Solution Approach 1:
The patent incorporates a drum structure on the outer circumference of the rotor base body as a preliminary structural reinforcement. This drum provides preemptive structural support to counteract centrifugal forces that will act during high-speed rotation, ensuring stability is maintained before the centrifugal forces become problematic.
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 enhances the rotor's ability to provide high torque and power at high maximum speeds with reduced installation space, supporting high circumferential speeds and torque density.
Implementation Method 1
an electric machine has a housing and a stator. The stator is also referred to as the stand. Furthermore, an electric machine has a rotor. The rotor is rotatably mounted in the housing.
Implementation Method 2
permanent magnets positioned in the recesses, and poles which, viewed in a circumferential direction, are arranged alternately next to one another and form pole pairs
Data Source
AI summary
A rotor including a rotor base body having radially outwardly open pocket-like recesses and permanent magnets positioned in the recesses, and poles which, viewed in a circumferential direction, are arranged alternately next to one another and form pole pairs. At least one permanent magnet group including the permanent magnets arranged in the recesses is positioned in a V-shape formed in a region of each pole, the permanent magnets diverging radially outwards. Radially outward ends of the permanent magnets positioned in the V-shape, which extend adjacent an outer circumference of the rotor base body, have an outer surface with a chamfer, which extends at a respective circumferential position of a respective radially outer end in a tangential direction or parallel to the tangential direction of the outer circumference of the rotor base body. The rotor base body supports a drum on the outer circumference.