Motor Efficiency Analysis via Current and Voltage Signals
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Solution Overview
Problem
Current methods lack the capability for real-time motor efficiency estimation in factories, where motors of various brands and types cannot be stopped for inspection, leading to inefficient energy management and increased maintenance costs due to reliance on experience-based operations rather than data-driven insights.
Innovation Solution
A motor efficiency analysis method using a measured primary current signal and voltage from a driving device, processed through algorithms to estimate rotational speed, torque, and stator resistance, enabling real-time efficiency calculations without requiring powerful core processing, and utilizing an embedded system coupled to the motor inverter for continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time motor efficiency monitoring is implemented using traditional methods, then measurement precision is improved, but device complexity increases due to requirement of powerful core processing and complex hardware systems
Solution Approach 1:
The patent extracts only the essential data elements needed for efficiency calculation (primary current signal and voltage from driving device) and processes them through simplified algorithms, eliminating the need for complex hardware systems while maintaining measurement precision
Solution Approach 2:
The patent replaces complex mechanical processing systems with software-based algorithms that run on standard microcontrollers, substituting hardware complexity with computational efficiency to achieve real-time monitoring without powerful processing requirements
2Reliability
If motors are stopped for inspection and maintenance, then reliability is improved, but productivity decreases due to production interruptions
Solution Approach 1:
The patent implements continuous real-time monitoring of motor efficiency parameters, providing ongoing feedback on motor condition without requiring shutdowns, enabling preventive maintenance scheduling that maintains both reliability and productivity
Solution Approach 2:
The patent performs preliminary detection of efficiency degradation trends through continuous monitoring, allowing maintenance to be scheduled in advance during planned downtime rather than requiring unexpected stoppages, thus maintaining productivity while ensuring reliability
3Ease of operation
If experience-based operations are used for energy management, then ease of operation is maintained, but loss of information increases due to lack of real-time data
Solution Approach 1:
The patent enables the system to automatically collect, process, and present motor efficiency data without requiring complex manual measurements or specialized knowledge, making real-time information available through simple interfaces that maintain ease of operation while eliminating information loss
Data Source
AI summary
The present invention discloses a motor efficiency analysis method for motor inverter. The method can be performed via a real-time motor operation efficiency display device. Based on the measured primary current signal and the voltage provided by the driving device, the device can estimate related data, such as the real-time efficiency, rotational speed, torque and stator resistance, by means of several algorithms. Besides, the device is designed to be applied to most motors; therefore, users can manage the efficiency of all motors of the factory without the need to stop the machines or the manufacturing process.