Motor Terminal Box Data Modulation Over Three-Phase Power Cable
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Solution Overview
Problem
Conventional three-phase motor systems lack efficient and cost-effective solutions for condition monitoring and data transmission, often requiring separate power lines and complex computational resources, which increases installation and maintenance costs and reduces system availability.
Innovation Solution
A three-phase motor system with a terminal box that integrates a data collector and signal electronics for modulating and demodulating voltage portions over the same three-phase power cable, allowing for contactless data transmission and condition monitoring without a separate power supply, using the Internet-connected signal electronics for evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power lines and computational resources are used for condition monitoring, then monitoring capability is improved, but installation and maintenance costs increase
Solution Approach 1:
The patent combines power transmission and data communication functions into a single three-phase power cable. The data collector modulates sensor data onto voltage portions of the power cable, allowing both power delivery to the motor and wireless data transmission through the same cable infrastructure, eliminating separate communication lines and reducing installation complexity
Solution Approach 2:
The three-phase power cable serves dual purposes: delivering electrical power to the motor and transmitting modulated sensor data to external systems. This multi-functional use of existing infrastructure eliminates the need for dedicated communication cables and reduces overall system complexity
2Productivity
If a powerful computer is installed in the motor for data evaluation, then data processing capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the powerful computer and data evaluation functions from the motor itself and relocates them to external systems connected via the Internet. The motor retains only minimal data collection and modulation capabilities, while complex processing is performed remotely, reducing motor complexity and cost
Solution Approach 2:
The patent introduces an Internet connection as an intermediary between the motor's data collector and external processing systems. This allows the motor to transmit data without requiring local processing power, delegating computational tasks to remote servers while maintaining real-time monitoring capabilities
3Speed
If modulation frequency is increased for faster data transmission, then data transmission speed is improved, but interference with motor operation increases
Solution Approach 1:
The patent employs periodic modulation of voltage portions at frequencies higher than 1 kHz, synchronized with the motor's operational cycles. By modulating during specific time windows and using periodic bursts rather than continuous modulation, the system achieves fast data transmission while minimizing interference with motor operation
Solution Approach 2:
The patent changes the frequency parameter of voltage portions to be higher than 1 kHz, enabling faster data transmission. This parameter change allows the system to transmit more data per unit time while the high frequency ensures the modulation cycles are complete well before affecting motor operation, reducing harmful 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
This solution reduces the need for additional lines and computational resources, lowers installation and maintenance costs, enhances system availability, and simplifies condition monitoring by enabling data transmission and evaluation through existing electrical lines, while minimizing interference and allowing for real-time monitoring of physical parameters.
Implementation Method 1
an electronic circuit for modulation and demodulation of voltage portions
Data Source
AI summary
A system includes an electric motor having a terminal box into which a three-phase power cable is guided and in which the stator winding, e.g., 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. 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, and the data collector has an electronic circuit for the modulation and demodulation of voltage portions.