Frequency Converter Direct User Control via Electrical Quantity Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current motor drives with frequency converters lack a natural and intuitive way for users to interact directly, relying on external interfaces which are not user-friendly and do not allow for direct control without additional devices.
Innovation Solution
A method that converts changes in electrical quantities caused by user actions into observations, selects control symbols based on matching sequences with valid patterns, and controls the frequency converter using these symbols, enabling direct user interaction and recognizing unintentional actions as safety features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external interfaces (front panel or communication interface) are used for user control, then the frequency converter can receive control parameters, but the user interaction is not natural or intuitive and requires additional external devices
Solution Approach 1:
The motor drive system performs self-diagnosis by automatically detecting and analyzing changes in electrical quantities (current, voltage, frequency) that occur when a user physically interacts with the load. The system converts these electrical changes into observations and matches them against stored action patterns to identify user intentions, eliminating the need for external control interfaces or devices.
Solution Approach 2:
The patent replaces traditional mechanical/electrical control interfaces (buttons, panels, communication protocols) with an electromagnetic sensing system. The frequency converter detects electromagnetic signals (changes in electrical quantities) generated by user actions on the load and translates them into control commands, substituting physical interface interactions with electromagnetic field-based detection.
2Adaptability or versatility
If traditional control interfaces are used, then control parameters can be received, but no direct user interaction with the motor drive is possible
Solution Approach 1:
The system introduces an intermediary layer that translates physical user actions into control commands. When a user performs an action on the load, the frequency converter detects the resulting electrical quantity changes, converts them into observations, and matches them against action patterns to generate the appropriate control symbol, serving as a mediator between the user's physical action and the motor drive's control system.
3Ease of operation
If external sensors are added for user interaction detection, then direct control becomes possible, but system complexity and cost increase
Solution Approach 1:
The frequency converter's existing electrical quantity sensing capabilities, originally designed for motor control, are repurposed to detect user actions on the load. The same sensors that monitor motor operation also capture changes caused by user interactions, eliminating the need for separate dedicated sensors and reducing overall system complexity.
Solution Approach 2:
The motor drive system uses its own existing measurement infrastructure to detect user actions. By monitoring changes in electrical quantities that occur during normal operation, the system independently identifies user interactions without requiring external sensing devices, performing the detection function using its own resources.
Data Source
AI summary
A motor drive and a method in connection with a motor drive including a frequency converter are provided. The motor of the drive is connected to a load, and the motor is controlled with the frequency controller. The method includes the steps of converting changes in electrical quantities of the motor caused by actions affecting the load into observations representing the changes, selecting control symbols on the basis of matching of the sequences of observations with a set of valid patterns, and controlling the converter based on the selected symbols.