Manual Motor Starter Trip Unit With Integrated Coil Mounting
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Solution Overview
Problem
The existing manual motor starter trip devices have a complex configuration with multiple components, leading to decreased workability, productivity, and increased assembly defects.
Innovation Solution
A streamlined trip device for manual motor starters is designed with a reduced number of components, featuring a coil attachment portion on the trip unit body to facilitate coil assembly, thereby simplifying the assembly process and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional trip device configuration with multiple components (trip body, fixed contact, heater assembly, coil assembly, core units, terminal rod, instant trip lever) is used, then the device can perform all necessary functions, but the device complexity increases and assembly defects occur frequently
Solution Approach 1:
The patent integrates the coil assembly directly onto the trip unit body by providing a coil attachment portion on the trip unit body, eliminating the need for a separate bobbin component. This merging of functions reduces the total number of components from 7 to 6, simplifies assembly procedures, and reduces assembly defects while maintaining all necessary functional capabilities of the trip device
Solution Approach 2:
The trip unit body is designed with multi-functionality by incorporating the coil attachment portion directly into its structure. This allows the trip unit body to serve both as the structural base for mounting all components and as the direct mounting surface for the coil assembly, eliminating the need for a dedicated bobbin and reducing overall device complexity
2Productivity
If a traditional assembly process with multiple components is used, then all necessary components can be installed, but the productivity decreases due to increased assembly time
Solution Approach 1:
By merging the coil assembly directly onto the trip unit body through an integrated coil attachment portion, the patent reduces the number of assembly steps. The coil can be installed directly onto the trip unit body without requiring separate bobbin assembly and attachment steps, thereby reducing assembly time and improving productivity
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
The simplified design shortens assembly time, reduces assembly defects, and improves component management, enhancing the overall efficiency and reliability of the manual motor starter trip device.
Implementation Method 1
a heater assembly inserted and coupled into the trip unit body and configured to detect a heat variation
Implementation Method 2
a coil assembly (a coil 21 and a bobbin 23) coupled to an upper portion of the bimetal supporter 17, core units (an upper core 31, a lower core 33, and a core spring 35) inserted into the coil 21
Data Source
AI summary
The present disclosure relates to a manual motor starter and, more specifically, to a trip device for a manual motor starter. A trip device for a manual motor starter according to an embodiment of the present disclosure comprises: a trip unit body forming the base of a trip unit; a fixed contact coupled to the lower portion of the trip unit body; a heater assembly inserted and coupled to the trip unit body and detecting the heat variation; a coil coupled to the upper portion of the trip unit body; a core unit inserted into the coil; a terminal rod coupled to the core unit and the trip unit body, and having one end portion forming a terminal unit; and an instant trip lever which is rotatably coupled to the trip unit body and is operated by the core unit, wherein a coil attachment portion in which the coil is inserted and installed protrudes from the trip unit body.