Motor Stator Yoke Flat Surfaces Winding Space
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Solution Overview
Problem
Conventional stators for motors have limited space volume for winding wires due to the curved shape of the yoke, restricting the configuration of the excitation winding section and reducing mechanical strength, which hinders the flow of magnetic flux and torque generation.
Innovation Solution
A stator design featuring an annular yoke with flat-surface portions on the inner peripheral surface, allowing the winding wire to regularly turn and increasing the space volume occupied by the winding wire, while maintaining mechanical strength by fitting the bobbin's flange portion into recesses formed by inclined surfaces, thus enhancing magnetic flux flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inner peripheral surface of the annular yoke is curved in a fan shape to receive the excitation winding section, then the winding wire can be accommodated, but the space volume occupied by the winding wire is limited and the configuration of the excitation winding section is restricted
Solution Approach 1:
The patent applies the reverse of this principle by using flat surfaces instead of curved surfaces. The inner peripheral surface of the annular yoke is designed with flat surfaces that extend in the circumferential direction, allowing the winding wire to be wound in a regular pattern without following a curved path, thereby increasing the effective space volume for the winding wire.
2Ease of operation
If the yoke is formed with a curved inner peripheral surface, then the excitation winding section can be mounted, but the mechanical strength of the yoke-side flange portion of the bobbin is reduced
Solution Approach 1:
The patent applies this principle by providing flat surfaces at specific locations (inner peripheral surface of the annular yoke) where the winding wire contacts, while other portions of the yoke can maintain their curved shape for structural integrity. This localized flat surface design allows the winding wire to be properly mounted while preserving the mechanical strength of the bobbin's flange portion.
3Ease of operation
If the inner peripheral surface of the yoke is curved, then the excitation winding section can be accommodated, but magnetic flux flow through the yoke is hindered
Solution Approach 1:
The patent applies this principle by changing the geometric parameters of the yoke's inner peripheral surface from curved to flat. This parameter change optimizes both the space for winding wire accommodation and the magnetic flux flow path, allowing magnetic flux to flow more readily through the yoke while still accommodating the excitation winding section.
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
The design increases the space volume for winding wires, improves magnetic flux flow through the yoke, and maintains mechanical strength by optimizing the cross-sectional area and configuration of the stator core.
Implementation Method 1
a stator for motors, which comprises a stator core including an annular yoke (7) and a magnetic pole constituent member (9) arranged inside the annular yoke (7), and N excitation winding sections (5) arranged at the magnetic pole constituent member (9)
Data Source
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AI summary
The present invention provides a stator for motors in which a space volume occupied by the winding wire of an excitation winding section can be increased, thereby allowing magnetic flux to readily flow through the yoke. On an inner peripheral surface portion of the yoke 7, a pair of flat-surface portions 7b are respectively formed in the circumferential direction on either sides of six fitted recesses 7a so that the flat-surface portions are continuous with the inner surfaces of the fitted recesses 7a. The pair of flat-surface portions 7b are located on the same virtual plane and have a side of an identical dimension that extends in the circumferential direction. The inner surface of the fitted recess 7a is constituted by a pair of inclined flat surfaces 7c respectively continuous with the pair of flat-surface portions 7b. The first flange portion 23b of the bobbin 23, which is in contact with the inner peripheral surface of the yoke 7, includes a flat plate-like body 23d and a pair of ribs 23e. With the excitation winding section 5 being mounted onto the stator core 3, the pair of ribs 23e are fitted into a pair of spaces 19 formed between the yoke 7 and the magnetic pole constituent member 9.