Slipring Unit Actuator Mechanism for Wound Rotor Motor
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Solution Overview
Problem
Wound rotor motors with slipring units have complex mechanisms for short-circuiting rotor windings and raising brushes, leading to high setup and maintenance costs.
Innovation Solution
A simplified mechanism using a rotatable short-circuiting bushing and linear actuator with main levers and lanyards to move brushes and short-circuiting bushing between positions, allowing easy setup and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex mechanism is used for short-circuiting rings and raising brushes, then the motor can achieve the required functions, but the setup and maintenance costs increase
Solution Approach 1:
The patent combines the short-circuiting bushing and brush support structure into a single integrated component that rotates together with the shaft. This merging eliminates the need for separate complex mechanisms to control both functions, reducing device complexity while maintaining functional reliability through the unified rotational movement.
Solution Approach 2:
The rotatable short-circuiting bushing serves multiple functions simultaneously: it short-circuits the rings during rotation and provides support for the brushes. This multi-functionality reduces the number of separate components and mechanisms needed, thereby simplifying the overall device structure while ensuring reliable operation.
2Reliability
If brushes remain in contact with rings during operation, then electrical connection is maintained, but wear and dirt accumulation increase
Solution Approach 1:
The patent implements periodic contact between brushes and rings by rotating the short-circuiting bushing, which brings brushes into contact with rings only during specific phases of rotation. This periodic action maintains necessary electrical connections while minimizing continuous contact, thereby reducing wear and dirt accumulation compared to constant contact systems.
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
A slipring unit (1) for a wound rotor motor comprises: - a support plate (12); - a stator; - a rotatable shaft (3) comprising a rotor having one or more rotor windings; - a ring bushing (5) integrally coupled to the shaft (3) and carrying one or more electrically conductive rings (6), each electrically connected to one of said one or more rotor windings; - one or more brushes assemblies (9), each comprising one or more brushes (10), and a brushes lifting mechanism (21) for moving said one or more brushes (10) between a lowered position, wherein said one or more brushes (10) are in contact with a respective one of said one or more electrically conductive rings (6), and a raised position, wherein said one or more brushes (10) are at a distance from the respective one of said one or more electrically conductive rings (6); - a short-circuiting bushing (11) integrally rotatable with and slidingly movable relative to the shaft (3) between a short-circuiting position, wherein the short-circuiting bushing (11) interacts with the ring bushing (5) such that the one or more electrically conductive rings (6) and the one or more rotor windings are short-circuited, and a non-short circuiting position, wherein each of the one or more rotor windings is electrically insulated from the others of the one or more rotor windings and from the one or more electrically conductive rings (6); - an actuator (16) fixedly connected to the support plate (12); - at least a main lever (14) hinged to the support plate (12), so to be rotatable relative to the support plate (12) between a first position and a second position, and connected directly or indirectly to the actuator (16), wherein the main lever (14) is further connected to the short-circuiting bushing (11) and to the brushes lifting mechanism (21) such that, when the main lever (14) is in the first position, the brushes (10) are in the lowered position and the short-circuiting bushing (11) is in the non-short-circuiting position, and, when the main lever (14) is in the second position, the brushes (10) are in the raised position and the short-circuiting bushing (11) is in the short-circuiting position.