Electromechanical Transducer with Segmented Rotor and Offset Stator Projections
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Solution Overview
Problem
Existing electromechanical converters face challenges with low efficiency and complex manufacturability, particularly due to the use of ironless permanent magnets leading to lower power density and the need for intricate production processes.
Innovation Solution
The design features a rotor with alternating north and south poles and non-magnetic webs for increased stability, along with stators that have radially extended support beams and projections forming a circular ring around the rotor axis, allowing for a high number of poles and efficient magnetic flux, and a segmented stator structure for easier assembly and higher magnetic force density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ironless permanent magnets are used in the rotor, then the production process is simplified, but the power density and efficiency decrease
Solution Approach 1:
The rotor is segmented into multiple independent permanent magnets arranged in a star pattern, allowing simplified production while maintaining high power density through optimized magnetic pole configuration. The segmentation enables easier manufacturing of individual magnets while achieving superior overall performance.
Solution Approach 2:
The rotor combines non-magnetic rotor body material with permanent magnets to create a composite structure. This allows the rotor to benefit from the simplified production of non-magnetic materials while incorporating the high power density characteristics of permanent magnets in a strategic arrangement.
2Stability of the object's composition
If individual permanent magnets are introduced into the rotor in a suitable manner, then the rotor structure is optimized, but the production technology becomes complex
Solution Approach 1:
The rotor structure is divided into discrete permanent magnet segments that can be independently positioned and secured. This segmentation simplifies the introduction process while maintaining structural optimization, as each magnet can be placed in its designated location without requiring complex integrated manufacturing.
Solution Approach 2:
The permanent magnets are pre-positioned and secured in the rotor during the manufacturing process before final assembly. This preliminary action ensures optimal rotor structure is achieved while simplifying subsequent production steps, as the magnetic pole configuration is already established.
3Device complexity
If forces act on only one side of the rotor disks, then the motor principle is simplified, but the efficiency and performance are reduced
Solution Approach 1:
The invention merges the force-generating capability to both sides of the rotor by positioning stators on both sides, with permanent magnets arranged to interact with both stators simultaneously. This combination doubles the effective force generation while maintaining a relatively simple motor principle based on electromagnetic interaction.
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 enhances power density, stability, and manufacturability, enabling the production of high-torque motors with reduced weight and increased efficiency by minimizing magnetic short circuits and parasitic stray fields.
Implementation Method 1
permanent magnets are arranged concentrically in a radiating manner... magnetically active surfaces of the stators are end faces of projections... forming a circular ring around the rotor axis
Implementation Method 2
electromechanical converter with at least one disk-shaped or ring-shaped rotor... and at least two stators provided on both sides of the rotor
Implementation Method 3
an annular winding slot for receiving at least one winding is provided between these stator sections
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to an electromechanical transducer having at least one disc-like or annular rotor, in and/or on which permanent magnets are arranged in a concentrically radiant manner, and having at least two stators which are provided on either side of the rotor, wherein the stators are at least partially produced from soft-magnetic material; each stator has a first stator section with radially outer supporting bars for first magnetic active surfaces of the stator which are situated opposite the rotor and has a second stator section with radially inner supporting bars for second magnetic active surfaces of the stator which are situated opposite the rotor; an annular winding slot for receiving at least one winding is provided between said stator sections; the supporting bars are each arranged in an annular manner and each extend parallel to the rotor axis in the direction of the rotor; the magnetic active surfaces of the stators are end surfaces of projections which are uniformly spaced apart from one another and which project from the supporting bars in the direction of the rotor; the projections which are in each case provided on the radially outer supporting bars are offset at an angle in relation to the projections which are in each case provided on the radially inner supporting bars in respect of the projection spacing by half a distribution dimension, and, in the case of at least one of the stators, the projections which are provided on the radially outer supporting bars and/or the projections which are provided on the radially inner supporting bars extend at least partially over the winding slot with a radial orientation, so that the winding slot is formed between stator backs which hold the supporting bars, the supporting bars and the projections, wherein a respective air gap which extends parallel to the circumferential direction of the rotor is provided between the projections. The object of the present invention is to provide an electromechanical transducer of the above-mentioned generic type which has a high degree of efficiency and can be produced in a technologically simple manner. The object is achieved by an electromechanical transducer of the above-mentioned generic type, in which the radius at which the radially inner supporting bars are spaced apart from the rotation axis of the electromechanical transducer is greater than the radial extent of the magnetic active surfaces of the stators.