Rotary Electric Machine Non-Contact Magnetic Pole Positioning
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Solution Overview
Problem
Existing brushless wound field type rotary electric machines face design restrictions and limited output performance due to the coaxial positioning of stator, rotor, and field coil, which necessitates a solution to maintain magnetic poles in a non-contact state while allowing for increased design freedom and performance.
Innovation Solution
A rotary electric machine design featuring a stator with alternating current windings, a rotor with annular magnetic poles and claw/projection configurations, and a field coil that maintains magnetic poles in a non-contact state through radial, circumferential, and axial gaps, utilizing non-magnetic gap arrangement members for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If stator, rotor, and field coil are disposed coaxially in a narrow space, then the machine fits within compact dimensions, but the degree of freedom of design is restricted and output performance is limited
Solution Approach 1:
The invention transitions from traditional coaxial arrangement to a configuration where the rotor is disposed radially inside the stator with the field coil positioned at the center, utilizing radial and axial spatial dimensions more effectively. This dimensional reorganization allows for improved design freedom and output performance while maintaining compact overall volume.
2Power
If magnetic poles are positioned in close proximity to increase magnetic flux, then output performance improves, but contact between poles causes mechanical wear and loss of magnetic flux
Solution Approach 1:
A non-magnetic material is introduced as an intermediary substance between the first and second magnetic poles. This intermediary maintains a precise radial gap that prevents direct contact between magnetic poles, eliminating mechanical wear and magnetic flux loss while allowing the poles to be positioned close enough to maintain strong magnetic coupling for high output performance.
3Reliability
If magnetic poles are maintained in a non-contact state with gaps, then mechanical wear is eliminated and magnetic flux is preserved, but positioning precision and structural stability become challenging
Solution Approach 1:
The non-magnetic material serves a dual function: it maintains the radial gap between magnetic poles to prevent contact while simultaneously acting as a positioning structure that ensures precise and stable positioning. This self-service approach integrates the gap-maintaining and positioning functions into a single component, achieving both reliability and manufacturing precision.
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 the degree of design freedom and output performance by allowing non-contact positioning of magnetic poles, increasing magnetic flux and centrifugal strength, and enabling the machine to function as both a motor and generator.
Implementation Method 1
a stator (3) having a stator winding (14) that generates a rotating magnetic field by an alternating current
Implementation Method 2
a field coil (7) that excites the rotor (2) by a direct current
Implementation Method 3
a rotor (2) that is rotatably held about a rotation axis (10) with respect to the stator (3)
Data Source
AI summary
A rotary electric machine includes a stator, a rotor, and a field coil; the rotor includes a first magnetic pole having a first annular portion and a plurality of claw portions and a second magnetic pole having a second annular portion and a plurality of projection portions; in the rotor, the claw portions and the projection portions are circumferentially alternately positioned, and the first magnetic pole and the second magnetic pole are maintained in a non-contact state by providing a radial gap, a circumferential gap, and an axial gap between the first magnetic pole and the second magnetic pole; and the gap arrangement member has an axial positioning portion that is axially locked with respect to at least one of the first magnetic pole and the second magnetic pole, and axially positions the first magnetic pole and the second magnetic pole.