Winding Switching Device Perpendicular Electrode Contact
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Solution Overview
Problem
Existing winding switching devices face reliability issues due to wear and damage from sliding electrodes and loss of driving force, which degrades electrical contact reliability between movable and fixed units.
Innovation Solution
A winding switching device with a movable unit and a regulating portion that maintains contact by displacing conductors away from electrodes, ensuring reliable switching between series and parallel connections, even when external power is lost, using a combination of convex and concave portions and a tension spring for fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable body slides with respect to the electrode of the device main body to switch connection states, then the switching operation can be performed, but wear or damage of the electrode occurs and reliability degrades when external power is lost
Solution Approach 1:
Instead of having the movable body slide along the electrode surface, the invention inverts the approach by having the movable body move perpendicular to the electrode surface. The movable body includes a movable electrode that approaches and contacts a fixed electrode, with the connection state determined by the position in the approaching direction rather than sliding direction. This eliminates wear from sliding friction while maintaining reliable electrical contact.
Solution Approach 2:
The invention changes the dimension of movement from lateral sliding (parallel to electrode surface) to approach movement (perpendicular to electrode surface). The movable body moves in the direction approaching the fixed electrode, and the switching is achieved by the position in this approaching direction. This dimensional change eliminates the harmful sliding action while preserving the switching function.
2Productivity
If sliding contact is used for switching, then the switching function is achieved, but wear and damage occur reducing operational lifespan
Solution Approach 1:
The invention inverts the contact mechanism from sliding to approach movement. The movable electrode approaches the fixed electrode perpendicularly to establish electrical connection, eliminating the sliding friction that causes wear. This approach movement preserves the switching function while significantly extending the lifespan of both movable and fixed electrodes.
Solution Approach 2:
The invention changes the movement dimension from lateral sliding to perpendicular approach. By moving the movable electrode in the direction approaching the fixed electrode rather than sliding parallel to it, the switching function is achieved without the harmful wear effects, thereby extending operational lifespan.
Data Source
AI summary
An object of the present invention is to provide a winding switching device capable of enhancing the reliability of electrical contact between a movable unit and a fixed unit, and a rotating electrical machine drive system including such a winding switching device. A winding switching device switches a connection state of a plurality of windings, and includes a plurality of electrodes to which the plurality of windings are connected; a movable unit that includes a plurality of conductor portions in contact with the plurality of electrodes, and that is driven in a predetermined direction in which the plurality of electrodes are arranged; and a fixed unit including a regulating portion that regulates movement of the movable unit in the predetermined direction; where the connection states of the plurality of windings are switched according to the position of the movable unit; and when the movable unit moves in the predetermined direction, the plurality of conductors are displaced in a direction of moving away from the plurality of electrodes by the regulating portion.