Electromagnetic Lock Monitoring for Rotor Housing State Detection
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Solution Overview
Problem
Existing monitoring solutions for rotor spinning machines are not sufficiently reliable in determining the proper closing state of the rotor housing, leading to risks of machine damage and operator injury due to manufacturing tolerances and temperature fluctuations.
Innovation Solution
A method involving generating two current pulses with opposite amplitudes to determine the state of a locking device for the rotor housing by evaluating the difference between measured values, compensating for temperature influences and manufacturing tolerances, using a control device with a switching unit and comparator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing monitoring solutions are used to determine the closing state of the rotor housing, then the device complexity is reduced, but the reliability of monitoring is insufficient due to manufacturing tolerances and temperature fluctuations
Solution Approach 1:
The patent applies parameter changes by using two different current pulses (first and second current pulses) with different amplitudes to excite the electromagnetic locking device. By measuring the current values during the switching operation and evaluating the difference between these measurements, the system compensates for temperature influences and manufacturing tolerances. This dual-pulse approach with parameter variation enables reliable state determination independent of environmental conditions.
2Measurement precision
If temperature compensation is implemented in the monitoring system, then the measurement precision is improved, but the device complexity increases due to additional sensors and processing
Solution Approach 1:
The system uses the electromagnetic locking device itself as the measurement object by generating current pulses through its coil and measuring the resulting current values. The locking device's own electromagnetic characteristics are exploited to determine its state, eliminating the need for separate temperature sensors or additional measurement components. The self-service approach achieves temperature compensation without external sensors.
Solution Approach 2:
By varying the current pulse parameters (amplitude, timing) and measuring the electrical characteristics of the locking device coil, the system extracts state information that is inherently temperature-compensated. The evaluation of current value differences during switching operations provides measurement precision independent of temperature fluctuations without requiring additional sensing hardware.
3Object-affected harmful factors
If the rotor housing closing state is not accurately monitored, then the ease of operation is improved, but harmful factors increase due to risk of machine damage and operator injury
Solution Approach 1:
The system continuously monitors the state of the electromagnetic locking device by measuring current values during switching operations and providing feedback to the control device. The control device uses this feedback to determine whether the rotor housing is properly closed and the rotor has stopped, enabling safe operation decisions. This feedback mechanism prevents machine damage and operator injury while maintaining ease of operation through automated monitoring.
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
Ensures accurate and reliable determination of the locking device state, independent of temperature and manufacturing variations, preventing machine damage and operator injury by ensuring safe rotor operation.
Implementation Method 1
The locking device (10) comprises an electromagnetic actuator (11).
Implementation Method 2
When current flows through the coil 12, this generates a magnetic field around the plunger core 13
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to methods for monitoring a state of a locking device for a spinning station of a rotor spinning machine, comprising the following steps: - generating two current pulses in a temporal sequence, wherein a second current pulse has an amplitude opposite in sign to a first current pulse, wherein the temporal sequence is controlled by a switching unit of a control device of the spinning station, - determining a measured value with regard to the respective current pulses as a function of a switching operation by the switching unit, - determining a difference between the respective measured values, - evaluating the difference on the basis of a comparison with a reference value range, wherein the reference value range is specific for whether the locking device is in a closed or open state, - determining a state of the locking device as a function of the result of the evaluation.Furthermore, the invention relates to a rotor spinning machine and a computer program.