Multi-Phase Stator Assembly With Short-Circuit Rings
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Solution Overview
Problem
The manufacturing of electric drives with a high number of electrical phases is complex and costly due to the precise insertion of conductive rods into stator slots, leading to increased complexity and potential errors in the assembly process.
Innovation Solution
The electric drive incorporates a stator with multiple conductor sections connected to separate short-circuiting means, allowing for independent control and reduced complexity in assembly by distributing conductor sections symmetrically and using power electronics to generate rotating fields, thereby simplifying the manufacturing process and enabling efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of electrical phases in the stator is increased, then the power and performance of the electric drive is improved, but the manufacturing complexity and effort are significantly increased
Solution Approach 1:
The stator winding is divided into multiple independent phase windings, each with its own conductor sections connected to separate short-circuiting means. This segmentation allows for modular assembly where conductor sections can be inserted into slots and connected to short-circuiting rings in a systematic manner, reducing the overall manufacturing complexity despite the high number of phases
Solution Approach 2:
Conductor sections from different phases are connected to common short-circuiting means (short-circuiting rings) at the ends of the stator slots. This merging approach reduces the total number of connection points and simplifies the assembly process by allowing multiple conductor sections to be connected to a single short-circuiting ring rather than requiring individual connections for each conductor section
2Power
If the number of electrical phases in the stator is increased, then the power output is improved, but the precision required for inserting conductive rods into slots is significantly increased
Solution Approach 1:
The stator winding is divided into multiple independent phase windings, each with its own conductor sections. This segmentation allows for systematic insertion of conductor sections into slots, where each section can be positioned and connected to short-circuiting means in a modular fashion, reducing the precision requirements compared to a monolithic winding structure
Solution Approach 2:
Conductor sections are pre-assembled and connected to short-circuiting means before being installed in the stator slots. This preliminary assembly allows for quality control and precision checking to be performed on smaller, more manageable components, reducing the overall precision requirements during final installation
3Ease of manufacture
If conductor sections are distributed symmetrically in the stator, then the manufacturing process is simplified, but the design flexibility is reduced
Solution Approach 1:
The stator winding is segmented into multiple independent phase windings with conductor sections that can be independently configured. This segmentation provides design flexibility by allowing different numbers of conductor sections per phase while maintaining symmetric distribution patterns, enabling both manufacturing simplicity and design adaptability
Solution Approach 2:
The design allows for dynamic configuration of conductor sections, where the number and arrangement of conductor sections per phase can be adjusted based on specific application requirements. This dynamic approach maintains symmetric distribution for manufacturing simplicity while enabling design flexibility through configurable parameters
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 approach reduces the number of conductor sections connected to each short-circuiting means, simplifies the assembly process, and allows for flexible design adaptations, enhancing manufacturing efficiency and operational flexibility while maintaining high slot filling factors and reducing installation space.
Implementation Method 1
Adjacent conductor sections are each designed to be supplied with their own phase current from the power supply unit. The phase currents are each generated such that they generate rotating fields in the stator which induce alternating currents in the other phase windings.
Implementation Method 2
The alternating currents induce electromagnetic force between adjacent conductor sections, causing the rotor to be accelerated and rotate in the direction of the rotating field.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to an electric drive (20) having an electric machine (10). The electric machine (10) comprises a stator (21) and a rotor (22) mounted so as to be movable with respect to the stator (21), wherein: the stator (21) has at least two first conductor sections (23) and at least two second conductor sections (24); the stator (21) has at least one first short-circuit means (25) and at least one second short-circuit means (26); the first conductor sections (23) are electrically connected to the first short-circuit means (25); the second conductor sections (24) are electrically connected to the second short-circuit means (26); and the first conductor sections (23) and the second conductor sections (24) are each designed to be supplied by means of their own electric phase. The invention further relates to a supply system (46) for the electric drive (20) and to a method for operating the electric drive (20).