Universal Motor Rotor Winding Segmentation for Commutation
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Solution Overview
Problem
The commutation performance of existing universal motors, particularly those with a large number of rotor winding turns, is not optimal, leading to inefficiencies and reduced motor life.
Innovation Solution
The design incorporates rotor winding units with at least two subcoils connected in series, separated by a tooth, and connected to adjacent commutator segments, along with a stator configuration that forms alternating primary and auxiliary magnetic poles to improve magnetic flux paths and reduce stator core and winding material requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of turns of rotor windings is increased to maintain torque capability, then the torque output is improved, but the commutation performance deteriorates
Solution Approach 1:
The rotor winding is divided into multiple separate winding units, each connected to adjacent commutator segments. This segmentation allows each winding unit to have fewer turns, improving commutation performance while the combined effect of multiple winding units maintains the overall torque output capability.
2Device complexity
If traditional rotor winding configuration is used to simplify structure, then the device complexity is reduced, but the magnetic flux path efficiency deteriorates
Solution Approach 1:
The stator is configured with alternating primary and auxiliary magnetic poles, creating different local magnetic field characteristics. The auxiliary poles generate magnetic flux that supplements the primary poles, improving overall flux path efficiency without requiring complex winding structures.
3Weight of moving object
If conventional stator configuration is used to reduce material requirements, then the weight and cost are reduced, but the magnetic flux path length increases
Solution Approach 1:
The auxiliary magnetic poles are integrated into the stator core structure alongside the primary poles, sharing the same magnetic circuit path. This merging allows the auxiliary flux to supplement the primary flux without requiring separate magnetic paths, thereby reducing overall material requirements while maintaining efficient flux paths.
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 commutation performance, prolongs motor life, and reduces material costs by optimizing flux paths and balancing initial winding unbalances, while maintaining high rotating speed and torque capabilities.
Implementation Method 1
each of the rotor winding units comprises at least two subcoils directly connected in series to each other and separated from each other by at least one tooth, and an initial subcoil and a final subcoil of each rotor winding unit are directly connected to a pair of adjacent segments respectively
Implementation Method 2
a stator configured to form 2P magnetic poles
Data Source
AI summary
An electric motor has a stator and a rotor magnetically coupled to the stator. The rotor has a shaft, a rotor core fixed to the shaft and having a plurality of teeth, a commutator fixed to the shaft adjacent the rotor core and having a plurality of segments, and rotor winding units wound about the teeth and connected to the segments. Brushes arranged in sliding electrical contact with the commutator transfer power to the rotor. Each of the rotor winding units has at least two subcoils directly connected in series to each other and separated from each other by at least one tooth. An initial subcoil and a final subcoil of each rotor winding unit are respectively directly connected to two adjacent segments.