Electrical Machine Rotor Braking Element and Overload Clutch
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Solution Overview
Problem
In rail and road vehicles equipped with electrical machines, a winding short-circuit can cause the rotor to continue rotating without external voltage, leading to induced voltage, arcing, and heat losses that can damage the stator insulation and conductor windings, necessitating a mechanism to prevent further damage and heating.
Innovation Solution
An electrical machine with a braking element and a release device, including a safety clutch triggered by the braking element, separates the rotor from the wheelset when a fault occurs, preventing induced voltage and heat buildup by allowing the braking element to generate a torque that activates the overload clutch, disconnecting the rotor from the drive train.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the rotor continues to rotate without external voltage supply, then the rotor can maintain its rotational motion, but induced voltage and heat losses occur that can damage the stator insulation and conductor windings
Solution Approach 1:
The braking element is extracted from the rotor and placed in the air gap to create a mechanical braking system that stops the rotor without electrical connection, eliminating induced voltage and heat losses while maintaining rotor rotation duration control
Solution Approach 2:
The braking element acts as an intermediary between the rotor and air gap, creating friction-based braking torque that stops the rotor mechanically rather than through electrical disconnection, thereby preventing harmful induced voltage and heat effects
2Reliability
If a braking element is released from the rotor into the air gap to generate braking torque, then the overload clutch can be triggered, but the device complexity increases
Solution Approach 1:
The braking element serves dual functions: it acts as both a braking mechanism to stop the rotor and a triggering mechanism for the overload clutch, combining multiple protective functions into a single component to reduce overall device complexity
Solution Approach 2:
The braking element is designed to perform multiple functions simultaneously: generating braking torque to stop rotor rotation, triggering the overload clutch mechanism, and providing fault protection, thereby reducing the need for separate dedicated components
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 solution effectively prevents further damage and heating by disconnecting the rotor from the wheelset, ensuring the electrical machine can be safely shut down and reducing the risk of insulation failure and overheating, thereby enhancing operational reliability and safety.
Implementation Method 1
By means of the braking element, a frictional force is generated, for example
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
The invention relates to an electrical machine (2) having a braking element (16) and a release device (14), wherein a rotor (4) of the electrical machine (2) comprises said braking element (16) and release device (14). The electrical machine (2) is located, for example, in a rail vehicle (10). In order to brake the rotor (4) of the electrical machine (2) in the event of an error in the drive train, an overload torque is generated by said electrical machine (2). An overload clutch (12) is triggered by this overload torque.