Polyphase Stator Winding with Pointed Connection Heads
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Solution Overview
Problem
Conventional polyphase stators in rotating electrical machines face challenges in optimizing the length of the stator winding to balance cooling efficiency and material usage, as reducing the length of the winding can lead to reduced airflow and increased resistance, while increasing the length can compromise cooling.
Innovation Solution
The stator design features a polyphase stator with notches that accommodate a winding configuration where connection heads and feet have a pointed shape with a rounded apex, optimizing the axial length between 15 and 20 mm, allowing for reduced resistance and improved airflow through the buns for effective cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the axial length of the stator winding is reduced, then the resistance is lowered and material usage is optimized, but the airflow through the winding is reduced and cooling efficiency deteriorates
Solution Approach 1:
The invention changes the geometric parameters of the connection heads and feet by giving them a pointed shape with a rounded apex instead of conventional shapes. This parameter change allows the axial length to be reduced to 15-20 mm while maintaining adequate airflow passages, thereby reducing resistance without compromising cooling efficiency
Solution Approach 2:
The invention applies curvature by rounding the apex of the connection heads and feet. This rounded geometry optimizes the airflow path through the winding buns, ensuring that cooling air can effectively pass through the reduced axial length structure while maintaining proper ventilation and heat dissipation
2Temperature
If the axial length of the stator winding is increased, then the airflow and cooling efficiency are improved, but the resistance increases and material usage is excessive
Solution Approach 1:
The invention optimizes the axial length parameter to a specific range of 15-20 mm, avoiding excessive length. The pointed shape with rounded apex of the connection heads and feet is specifically designed to maximize airflow efficiency within this constrained length, achieving effective cooling without the resistance and material waste associated with longer windings
3Productivity
If the axial length of the connection heads and feet is reduced to 15-20 mm, then the resistance is lowered and the machine becomes more compact, but the airflow passage may be compromised
Solution Approach 1:
The rounded apex of the connection heads and feet creates optimized airflow passages within the compact 15-20 mm axial length. This curved geometry prevents flow restriction that would occur with sharp edges or flat surfaces, maintaining adequate air passage area despite the reduced overall dimensions
Solution Approach 2:
The invention applies different geometric qualities to different parts of the connection heads and feet. The pointed shape with rounded apex provides local optimization of airflow paths at critical locations, ensuring that the reduced axial length does not compromise the airflow passage area where it is most needed for cooling
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 reduces the axial length of the winding, lowering resistance and enhancing airflow, thereby increasing the machine's efficiency and flexibility in power output while maintaining efficient heat exchange.
Implementation Method 1
This circulation of air makes it possible to cool the buns of the winding 12 of the stator 13, as well as the current rectifying device 11 and the voltage regulator
Implementation Method 2
As is known when the excitation winding 5 of the rotor 4 is electrically energized and the shaft of the rotor rotates, the rotor is magnetized and an induced alternating current is generated in the winding 12 of the stator 13
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The polyphase stator for an internally ventilated rotating electrical machine comprises a body (14) provided with slots and carrying a coil (12) having at least one winding per phase, which comprises: a plurality of pairs of lateral branches each intended to be mounted in a slot of the body (14); a plurality of connecting heads (50 to 55) extending outside the body (14) so as to form a first lead-out (42) and interconnect each pair of lateral branches; a plurality of coupling feet (150 to 155) offset circumferentially with respect to the plurality of connecting heads and extending outside the body (14) so as to form a second lead-out (43) and interconnect each pair of lateral branches; one of said pluralities having a generally pointed shape and having an axial length of between 15 and 20 mm. The rotating electrical machine comprises such a stator. Application: Stator and alternator or an alternator-starter of a motor vehicle.