Electric Motor Protection via Dynamic Current Voltage Ranges
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Solution Overview
Problem
Existing methods for protecting electric motors from critical operating states are costly and require specific temperature sensors, making them inefficient for widely differing electric motors.
Innovation Solution
Measuring and comparing motor current and voltage values with dynamically adjusted permissible operating ranges, eliminating the need for temperature sensors by using the monitored parameters to determine and adjust the operating ranges during both start-up and normal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are used to monitor motor operating states, then motor protection reliability is improved, but device cost and complexity increase
Solution Approach 1:
The patent extracts the temperature monitoring function from a dedicated temperature sensor and implements it through existing electrical parameter measurements (current and voltage). By measuring these electrical parameters and comparing them against pre-stored temperature-correlated reference values, the system achieves thermal monitoring without physically installing temperature sensors in the motor, thus reducing device complexity while maintaining protection reliability.
Solution Approach 2:
The patent introduces electrical parameter measurements (current and voltage) as intermediary indicators to indirectly monitor motor temperature and operating state. Instead of directly measuring temperature with sensors, the system uses electrical parameters that correlate with thermal conditions as mediators, enabling temperature monitoring functionality without the complexity of direct temperature sensing hardware.
2Measurement precision
If temperature sensors are positioned for accurate measurement, then measurement precision is improved, but ease of manufacture and installation deteriorates
Solution Approach 1:
The patent removes the requirement for physical temperature sensor installation and positioning within the motor. By extracting the temperature measurement function and replacing it with electrical parameter sensing at accessible terminals, the system achieves accurate thermal monitoring without the manufacturing and installation complexity of embedding temperature sensors in critical positions within the motor structure.
3Measurement precision
If individual calibration of motor parameters is performed, then measurement precision is improved, but productivity and ease of operation deteriorates
Solution Approach 1:
The patent creates a universal protection system that works across different motor types without requiring individual calibration. By storing multiple sets of reference values corresponding to different motor characteristics and automatically selecting the appropriate set based on motor identification, the system achieves motor-specific accuracy while maintaining universal applicability and operational simplicity.
Solution Approach 2:
The patent performs preliminary classification and storage of motor-specific reference values during system setup or manufacturing. By pre-storing multiple sets of current and voltage reference values that correspond to different motor types and conditions, the system eliminates the need for on-site individual calibration, thereby improving productivity while maintaining measurement precision through pre-configured accurate reference data.
Data Source
AI summary
Method for the protection of electric motors from critical operating states wherein, as the electric motor is operating, a motor current value and/or a motor voltage value is/are measured and compared with a permissible operating range wherein an output signal is generated when leaving the permissible operating range and, while the electric motor is operating, the permissible operating range is determined and adjusted continuously from the measured motor current value and/or from the measured motor voltage value.