Wound-Field Rotor Annular Coil-End Restraint
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Solution Overview
Problem
In wound-field rotors, the field coil can experience displacement at both the coil side part and coil end parts due to centrifugal force during rotation, necessitating improved stabilization.
Innovation Solution
The field coil is wound on main pole portions of the rotor core, with an annular member provided radially outer to the coil end part to suppress displacement, ensuring the coil is held in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holding members are provided between main pole portions to restrict coil movement, then coil side part displacement is suppressed, but coil end part displacement cannot be prevented
Solution Approach 1:
The patent transitions from two-dimensional holding members between main pole portions to a three-dimensional annular member that completely surrounds the coil end part. This annular structure extends in the axial direction beyond the rotor core, creating containment in multiple spatial dimensions (radial and axial) rather than just radial restriction between poles.
Solution Approach 2:
The annular member acts as an intermediary structure between the field coil and the external environment. It provides a mediating containment mechanism that directly supports the coil end part, distributing centrifugal forces across the annular structure rather than relying solely on the holding members between main pole portions.
2Reliability
If the field coil is tightly wound on main pole portions, then magnetic performance is improved, but centrifugal force during rotation causes displacement at coil end parts
Solution Approach 1:
The annular member is pre-installed to counteract the centrifugal force before rotation begins. During operation, this pre-positioned structure provides immediate resistance to the outward centrifugal force acting on the coil end parts, preventing displacement without affecting the tight winding of the coil on the main pole portions.
Solution Approach 2:
The patent divides the coil support function into two segments: holding members between main pole portions for radial restriction, and an annular member for axial and circumferential containment of the coil end part. This segmentation allows each component to specialize in addressing specific displacement vectors caused by centrifugal force.
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 annular member effectively prevents coil end part displacement, maintaining the field coil's proper state within the wound-field rotor.
Implementation Method 1
under the centrifugal force acting on the field coil during rotation of the rotor
Data Source
AI summary
A rotor, which is applicable to a wound-field rotating electric machine, includes: a rotor core having main pole portions provided respectively for magnetic poles aligned in a circumferential direction, each of the main pole portions protruding in a radial direction; and a field coil wound on the main pole portions of the rotor core. Moreover, the field coil has a coil end part located axially outside the rotor core. An annular member is provided, on a radially outer side of the coil end part, in such a manner as to surround the coil end part.