Motor Terminal Box Data Transmission Over Three-Phase Cable
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing three-phase motors require complex and costly installations and maintenance, with a high probability of defects and failures, and lack efficient condition monitoring without separate power supplies.
Innovation Solution
A three-phase motor system with a terminal box containing a data collector and sensors, using the three-phase cable for data transmission and modulation, allowing condition monitoring via internet-connected computers without a separate power supply, and utilizing signal electronics in the control cabinet for evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate power supply is provided for the data collector, then the data transmission reliability is improved, but the device complexity and installation cost increase
Solution Approach 1:
The patent combines the power supply function and data transmission function into a single three-phase cable. The data collector is powered from the three-phase cable while simultaneously using it for modulated data transmission, eliminating the need for separate power supply lines and reducing installation complexity
Solution Approach 2:
The three-phase cable is made multi-functional by using it both for power supply to the data collector and for data transmission through modulation. This universal usage of the existing cable infrastructure avoids additional wiring while maintaining system reliability
2Productivity
If a powerful computer is installed in the motor, then the data processing capability is improved, but the device complexity and cost increase
Solution Approach 1:
The system is segmented into two parts: a simple data collector with minimal processing capabilities installed in the motor, and a powerful computer located remotely that performs computationally intensive operations. This segmentation allows the motor to remain simple while still achieving high data processing capability through the remote computer
Solution Approach 2:
The patent introduces an intermediary communication system (modulated voltage components transmitted via the three-phase cable) that connects the simple data collector in the motor to the remote powerful computer. This intermediary enables the motor to leverage remote computing power without housing a powerful computer internally
3Reliability
If additional cables are used for data transmission, then the data transmission reliability is improved, but the installation cost and complexity increase
Solution Approach 1:
The patent merges the data transmission function with the existing power supply cable (three-phase cable). By modulating data onto the voltage components of the power cable, the system eliminates the need for separate data transmission cables while maintaining reliable communication
Solution Approach 2:
The three-phase cable is made multi-functional by using it both for power supply and for data transmission through modulation. This universal usage of the existing cable infrastructure avoids additional wiring while maintaining system reliability
4Productivity
If the modulation frequency is increased, then the data transmission rate is improved, but the interference from motor current increases
Solution Approach 1:
The patent employs periodic action by modulating data during specific time windows when motor current is absent or minimal (such as during inverter switching intervals). This periodic modulation approach allows higher data transmission rates while avoiding continuous interference from motor current
Solution Approach 2:
The system dynamically adjusts the modulation timing and frequency based on the motor's operational state. By synchronizing data transmission with periods when motor current interference is minimal, the system achieves higher effective data transmission rates while managing interference
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
Enables simple and cost-effective installation and maintenance, reduces defects, and facilitates high system availability with contactless data transmission and interference reduction, while allowing computationally intensive evaluations on remote servers.
Implementation Method 1
a data collector (6) is arranged in the terminal box (5) of the electric motor (3), which has a data storage device and which is electrically connected to at least one sensor (4) arranged in and/or on the electric motor (3), wherein the data collector (6) has an electronic circuit for modulating and demodulating voltage components
Implementation Method 2
an electronic circuit for modulating and demodulating voltage components
Data Source
Figure 1
AI summary
The invention relates to a system, in particular equipment, comprising an electric motor, wherein the electric motor has a terminal box into which a three-phase power cable is guided and in which the stator winding, in particular the wire ends of the winding wire of the stator winding, of the electric motor is electrically connected to electrical lines of the three-phase power cable, wherein a data collector is arranged in the terminal box of the electric motor, which has a data store and which is electrically connected to at least one sensor arranged in and/or on the electric motor, wherein the data collector has an electronic circuit for the modulation and demodulation of voltage portions.