Motor Drive System Synchronous Transfer Control
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Solution Overview
Problem
In motor driving systems, synchronous transfer to commercial driving and capture from commercial driving to variable speed driving require setting external speed references and involve delay times, leading to non-instant switching and complex control logic.
Innovation Solution
A motor driving system that performs commercial synchronous transfer and capture using a drive speed reference, eliminating the need for ON/OFF control of the commercial driving command by integrating a system controller to manage switching between drive variable speed and commercial driving modes based on predefined speed references and delay times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronous transfer and capture control is performed using external commercial driving commands, then switching between drive variable speed driving and commercial driving can be achieved, but the system complexity and wiring requirements increase
Solution Approach 1:
The patent extracts and eliminates the external commercial driving command signal from the control system. By using the drive speed reference that already exists in the variable speed drive system, the need for separate external commands is removed, simplifying the control architecture and reducing wiring requirements while maintaining the ability to switch between drive modes
Solution Approach 2:
The drive speed reference signal is made multi-functional by using it for both variable speed control and as the trigger for synchronous transfer and capture operations. This eliminates the need for dedicated external command signals, as the existing speed reference serves dual purposes, thereby reducing system complexity
2Ease of operation
If external speed references are used for synchronous transfer and capture, then motor speed control during switching is achieved, but delay times occur leading to non-instant switching
Solution Approach 1:
The system uses its own internal drive speed reference signal to trigger synchronous transfer and capture operations, eliminating the need for external command processing and associated delays. The drive system serves itself by utilizing existing internal signals for control functions, achieving instantaneous switching response
3Adaptability or versatility
If commercial driving command ON/OFF control is implemented, then switching between drive modes is controlled, but the control logic becomes complex
Solution Approach 1:
The patent removes the commercial driving command ON/OFF control logic from the system by utilizing the drive speed reference signal instead. This extraction of the external command requirement simplifies the control logic while maintaining the ability to switch between drive modes through the existing speed reference mechanism
Data Source
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AI summary
In a motor driving system, a motor driving system is provided which simplifies the system by ceasing ON/OFF control of a commercial driving command, and by performing commercial synchronous transfer and capture control based on a drive speed reference. A system controller 20 performs synchronization control so as to make a drive output coincident with a phase/amplitude of a commercial AC power source when a rotation speed of a motor 10 exceeds a drive speed reference n2, and when a prescribed requirement is satisfied, the commercial AC power source is synchronously transferred, and the motor 10 is driven by the commercial AC power source. In addition, when the drive speed reference is set to n1, and a drive output side switch 3 is closed, the drive output is connected to the commercial AC power source, and when a prescribed requirement is satisfied, the motor 10 is started to be driven at a variable speed (t7), and thereby the synchronous capture is performed.