Electric Motor Safety Monitoring with Redundant Speed Comparison
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Solution Overview
Problem
Existing safety devices for monitoring electric motor speed require multiple independent components, occupying significant space, complicating installation and increasing the risk of human error, and can provide inconsistent information due to potential faults, thereby reducing safety.
Innovation Solution
A safety device that integrates detection means to monitor both voltage and frequency on the power supply and rotation speed of the electric motor, using redundant channels for comparison to ensure accurate fault detection and increase safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple independent safety devices are used to monitor motor speed and voltage, then measurement accuracy is improved, but device complexity increases and installation becomes more difficult
Solution Approach 1:
The patent combines multiple independent safety devices into a single integrated safety device that monitors both voltage/frequency and motor speed through a unified processing unit, reducing the number of separate components while maintaining comprehensive monitoring capabilities
Solution Approach 2:
The integrated safety device performs multiple functions simultaneously: it monitors voltage, frequency, and motor speed through a single device with a universal processing unit that handles all measurement and comparison operations, eliminating the need for separate specialized devices
2Measurement precision
If multiple independent safety devices are installed, then measurement precision is improved, but ease of operation deteriorates due to complicated wiring
Solution Approach 1:
The patent merges multiple independent safety devices into one integrated unit with a single processing unit that handles all monitoring functions, significantly simplifying installation and wiring operations while maintaining comprehensive safety monitoring
Solution Approach 2:
The unified safety device provides universal monitoring capabilities for voltage, frequency, and speed through a single integrated system, eliminating the need for separate installation of multiple specialized devices and reducing wiring complexity
3Reliability
If redundant monitoring channels are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent integrates redundant monitoring channels into a single processing unit that simultaneously processes voltage, frequency, and speed data, maintaining reliability through multiple measurement approaches while avoiding the complexity of separate independent devices
Data Source
AI summary
A safety device (10) for monitoring an electric motor (101) connected to a power supply line (100) and equipped with a drive shaft (102). The safety device (10) comprises a control unit (12) having detection means, adapted to detect at least two physical quantities related to and associated with the operation of the electric motor (101), signaling means configured to transmit a control signal (C) generated by a first processing unit (17), which is connected to the detection means and the signaling means and configured to transmit the control signal (C) by means of the signaling means. The processing unit (17) is configured to compare the at least two physical quantities with each other, in order to detect faults or anomalies and to generate the control signal (C) on the basis of the aforementioned comparison.