Electric Machine Segmented Stator Winding
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Solution Overview
Problem
Electrical machines with distributed windings face manufacturing complexity and higher material costs, despite offering good electrical properties like low noise and low rotor losses, due to their complex end windings and high harmonic content in magnetomotive force.
Innovation Solution
The proposed electrical machine uses a stator with multiple slots for accommodating conductor sections, where these sections are short-circuited on one side with a one-piece short-circuit ring, allowing for individual or grouped phase control via a power supply unit, eliminating the need for distributed windings and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If distributed windings are used, then the magnetomotive force has low harmonic content resulting in low noise and low rotor losses, but the manufacturing complexity and material costs increase due to complex end windings
Solution Approach 1:
The distributed winding is segmented into individual conductor sections, each placed in separate slots and short-circuited at one end. This segmentation allows each section to be manufactured and positioned independently, eliminating the complex interconnections required in traditional distributed windings while maintaining the spatial distribution needed for low harmonic content.
Solution Approach 2:
Multiple conductor sections are merged by short-circuiting them at one end to a common short-circuit means, creating a simplified winding structure. This merging eliminates the need for complex end windings and long connecting wires, reducing manufacturing complexity while preserving the distributed configuration that produces low harmonic magnetomotive force.
2Reliability
If distributed windings are used, then good electrical properties are achieved, but the manufacturing effort and material costs increase
Solution Approach 1:
The winding system is divided into discrete conductor sections that can be manufactured as simple straight elements and inserted into slots independently. This segmentation dramatically reduces manufacturing effort compared to traditional distributed windings, while the segmented structure maintains the electrical performance characteristics of low harmonic content and low noise.
Solution Approach 2:
The conductor sections are designed as simple, inexpensive straight conductors that can be easily manufactured and replaced if needed. This approach uses simple, low-cost components rather than complex wound structures, reducing both material costs and manufacturing effort while achieving the desired electrical performance.
3Ease of manufacture
If conductor sections are short-circuited on one side, then manufacturing is simplified, but individual control of each conductor section is required
Solution Approach 1:
The short-circuited conductor sections are segmented into controllable groups or phases, with each group connected to the power supply unit. This segmentation allows simplified manufacturing through short-circuiting while the group-based control structure manages the complexity of individual section control through modular power electronics.
Solution Approach 2:
The control system is made dynamic and adaptable, allowing the power supply unit to selectively energize different groups of conductor sections based on operational requirements. This dynamic control approach manages the complexity by enabling flexible configuration rather than requiring simultaneous control of all sections, simplifying both manufacturing and operation.
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 achieves low noise, low rotor losses, and cost-effective production while maintaining good electrical properties, with reduced manufacturing effort and lower harmonic content in magnetomotive force, resulting in a more efficient and cost-effective machine.
Implementation Method 1
The stator has electrical windings that connect to a power system that is often polyphase. Distributed windings are often used for applications with more than two coils per pole per phase.
Implementation Method 2
A conductor section of the stator winding is inserted into each of the slots, with the conductor sections being electrically connected to one another at one end, that is to say on one side of the stator, so that they form a short circuit with one another.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Disclosed is an electric machine comprising a stator (1) and a rotor (21) that is mounted so as to be movable in relation to the stator, the stator being provided with a plurality of slots (2) for receiving a stator winding. Exactly one conductor portion (3) of the stator winding is inserted into each slot. The conductor portions (3) are mutually short-circuited in a short-circuiting means on a first side (5) of the stator and are made as a single piece with said short-circuiting means. On a second side (6) of the stator, the conductor portions (3) are each connected to a terminal of a power supply unit (8) supplying adequate phase currents.