Integrated Solid-State Contactor for Motor Control
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Solution Overview
Problem
Traditional motor control systems are bulky, complex, and costly due to the use of multiple discrete components for power conversion and bypass operations, which hinders accessibility and efficiency.
Innovation Solution
A motor control system integrating a multi-functional solid-state contactor and relays on a printed circuit board (PCB) that allows for selective power routing between power conversion and bypass modes, reducing the number of discrete components and minimizing wiring, with a control system managing the switching of solid-state switches and relays to control power flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional discrete components (input contactor, bypass contactor, soft-starter, output relay) are used for bypass assembly, then system redundancy and bypass capability are provided, but the system becomes expensive, complicated, bulky, and impractical
Solution Approach 1:
The patent combines multiple discrete components (input contactor, bypass contactor, soft-starter, output relay) into a single integrated solid-state contactor with unified housing and control circuitry. This merging eliminates the need for separate housings, mounting arrangements, and inter-component wiring, thereby reducing system complexity while maintaining bypass capability and redundancy.
Solution Approach 2:
The solid-state contactor is designed to perform multiple functions that previously required separate components: it provides input switching, bypass switching, soft-start functionality, and output relay operations. This multi-functionality is achieved through integrated solid-state switching devices and control logic that can selectively route power through different paths and control motor starting operations.
2Adaptability or versatility
If multiple discrete components with separate housings are used, then each component can be independently controlled, but the overall system footprint becomes large and wiring requirements become excessive
Solution Approach 1:
The patent integrates multiple independently controllable functions into a single compact housing, eliminating the need for separate component housings and their associated mounting spaces. The integrated design maintains independent control capability through internal circuitry and control logic while dramatically reducing the overall system footprint and eliminating extensive inter-component wiring.
3Adaptability or versatility
If traditional bypass assembly with separate components is used, then bypass functionality is achieved, but the system becomes bulky and accessibility to components is hindered
Solution Approach 1:
The patent integrates bypass functionality into the solid-state contactor housing, eliminating the need for separate bypass components and their associated wiring. This integration maintains full bypass capability while improving component accessibility by consolidating all controls and interfaces into a single accessible housing, eliminating the need to navigate around multiple discrete components.
Data Source
AI summary
A motor control system includes a motor switching assembly comprising a power converter positioned on a converter path, a first relay positioned on the converter path upstream of the power converter, a second relay positioned on a bypass path that is in parallel with the converter path, and a solid-state switching unit positioned upstream from the converter path and the bypass path. The motor control system also includes a control system that controls operation of the motor switching assembly, with the control system programmed to operate the solid-state switching unit in one of a conducting mode, a non-conducting mode, and a ramping mode, so as to selectively control and condition power flow therethrough. The control system is also programmed to control switching of the first and second relays between open and closed positions to selectively route power along the converter path or the bypass path.