Commutator Motor Winding Segmentation for Noise Reduction
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Solution Overview
Problem
Conventional commutator motors with alternating magnet elements and winding wires experience noise issues due to the need for different winding directions across adjacent magnet elements, resulting in inefficient noise behavior and reduced efficiency.
Innovation Solution
The winding wires of the two sections intersect such that one section is placed in armature slots between those of the other section, minimizing the intersection area and optimizing interaction with magnet elements, with additional armature slots separating them to achieve a more homogeneous distribution and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the two winding-wire sections are arranged in the same armature slot, then the winding structure is simplified, but noise increases and efficiency decreases
Solution Approach 1:
The armature slots are segmented into different types (first armature slots and second armature slots) that are spatially separated. The first winding-wire section is placed in first armature slots while the second winding-wire section is placed in second armature slots, preventing their overlap. This segmentation resolves the contradiction by maintaining structural simplicity through clear slot assignment while eliminating noise through spatial separation of the winding sections.
2Device complexity
If the two winding-wire sections are arranged in the same armature slot, then the device structure is simplified, but efficiency decreases
Solution Approach 1:
The armature slots are divided into distinct first and second armature slots that are spatially separated around the armature circumference. This segmentation allows each winding-wire section to be optimally positioned in its designated slots without interference, maintaining efficient magnetic interaction while simplifying the overall winding arrangement through clear spatial assignment.
Solution Approach 2:
The solution transitions from a two-dimensional planar arrangement where both winding sections could occupy the same slot to a three-dimensional circumferential distribution where first and second armature slots are separated around the armature. This dimensional change allows both winding sections to be optimally positioned without overlapping, resolving the efficiency-complexity contradiction.
3Adaptability or versatility
If the winding directions of the two winding-wire sections are configured differently, then the motor operates with alternating magnet elements, but noise behavior deteriorates
Solution Approach 1:
The armature slots are segmented into first and second armature slots with different orientations relative to the magnet elements. The first winding-wire section is placed in first armature slots with a first winding direction, while the second winding-wire section is placed in second armature slots with a second winding direction. This segmentation allows adaptation to alternating magnet elements while reducing noise through optimized spatial arrangement and direction configuration.
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 noise performance and efficiency by ensuring optimal winding interaction with magnet elements, resulting in a commutator motor with satisfactory noise behavior and high efficiency.
Implementation Method 1
a first winding-wire section is assigned to a first magnet element and a second winding-wire section is assigned to a second magnet element which adjoins the first magnet element in the circumferential direction
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a commutator motor (10), particularly as part of a windscreen-wiper motor (100), having at least four magnet elements (11 to 14) which are arranged on a reference-circle diameter around an axis of rotation of an armature shaft (2) with polarity that alternates in the circumferential direction, and having an armature (15) with armature slots (N1 to N18) and armature teeth (Z1 to Z18), wherein winding wires (20) having a multiplicity of windings (27, 28) in each case for constructing coils (C1 to C9) are arranged in the armature slots (N1 to N18), wherein a start (21) and an end (22) of a winding wire (20) is electrically conductively connected to a commutator hook (H1 to H18) in each case, wherein a winding wire (20) has two winding-wire sections (25, 26), which are arranged in the region of different magnet elements (11 to 14) in such a manner that a first winding-wire section (25) with a first number of windings (27) in a first winding direction is assigned to a first magnet element (11 to 14) and is located in two armature slots (N1 to N18), and that a second winding-wire section (26) with a second number of windings (28) in a second winding direction, opposite to the first winding direction, is assigned to a second magnet element (11 to 14) and is located in two armature slots (N1 to N18), and wherein the two magnet elements (11 to 14) have different polarities.