Solid-State Switching Device for Motor Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switching devices experience delays and arcing issues when opening and closing, leading to torque and current oscillations, and lack flexibility in controlling electric power distribution to electric motors, particularly in wye-delta starters, which affects motor efficiency and lifespan.
Innovation Solution
Implementing a single-pole, single current-carrying path switching device with advanced control mechanisms that allow for precise timing of switching based on current zero-crossings and predicted zero-crossings, enabling independent control of each phase of three-phase power to minimize arcing and oscillations, and modular configuration for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switching devices are opened and closed to control electric power distribution, then electric power can be connected and disconnected to loads, but delays occur between make/break instructions and actual switching, causing torque and current oscillations
Solution Approach 1:
The patent replaces traditional mechanical switching mechanisms with solid-state electronic switching devices (such as transistors, MOSFETs, or IGBTs) that can be controlled by electronic signals. This substitution eliminates mechanical inertia and contact delays, enabling near-instantaneous switching response to control signals, thereby resolving the contradiction between switching speed and switching delay.
2Ease of operation
If switching devices are used to control electric power to motors, then motor operation can be controlled, but electric arcing and current oscillations occur during switching, reducing device lifespan
Solution Approach 1:
The patent replaces mechanical contact-based switching with solid-state electronic switching components. These electronic switches do not have moving contacts that can arc or wear, eliminating the harmful effects of electric arcing and contact erosion. This substitution maintains full motor control capability while significantly improving the reliability and lifespan of the switching devices.
3Adaptability or versatility
If traditional switching devices are used in wye-delta starters, then motor starting and operation control is possible, but flexibility in controlling electric power distribution is limited, affecting motor efficiency
Solution Approach 1:
The patent segments the three-phase power distribution into independently controllable phases using individual solid-state switching devices for each phase. This segmentation allows precise control over which phases are active and at what power levels, enabling flexible transition between wye and delta configurations and optimizing motor efficiency across different operating conditions, thereby resolving the contradiction between control flexibility and energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces arcing and oscillations, enhances operational flexibility, and extends the lifespan of switching devices and electric motors by ensuring precise control over electric power distribution, minimizing wear and tear on components.
Implementation Method 1
an operator coil 112 disposed within the yoke 106 such that the yoke 106 channels flux generated by the operator coil 112 when energized
Data Source
AI summary
One embodiment describes a method that includes determining, using a control circuitry, temperature of a switching device before a make operation by applying a measurement current to an operating coil of the switching device, wherein the measurement current is insufficient to make the switching device; and determining voltage at the operating coil when the measurement current is applied, in which the voltage at the operating coil is directly related to the temperature. The method further includes determining, using the control circuitry, when to apply a pull-in current to the operating coil to close the switching device based at least in part on the voltage at the operating coil, such that the switching device makes at a desired time.