Starter Motor Offset Coil Asymmetry Space Utilization
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Solution Overview
Problem
The existing starter motor designs with coaxial drive and magnetic-switch coils result in terminal assemblies being disposed outside the housing's outer diameter, leading to inefficiencies in space utilization and increased material usage, which affects compactness, cost-effectiveness, and safety.
Innovation Solution
The starter motor incorporates an offset magnetic-switch coil within the housing, allowing for a more compact design by creating space for the drive coil's positive lead and reducing plastic material usage, while maintaining functionality through the shifting of terminals and contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If both drive and magnetic-switch coils are coaxial with the central longitudinal axis, then the coils can be easily manufactured and assembled, but the terminal assembly is disposed outside the housing's outer diameter, resulting in poor space utilization and increased material usage
Solution Approach 1:
The patent applies asymmetry by offsetting the magnetic-switch coil from the central longitudinal axis of the housing. This asymmetric arrangement allows the terminal assembly to be positioned within the housing's outer diameter, improving space utilization without compromising manufacturing ease. The drive coil remains coaxial for ease of manufacture, while the magnetic-switch coil's offset position resolves the spatial conflict.
2Device complexity
If both coils are coaxial with the central longitudinal axis, then the structural design is simple and symmetric, but the starter motor assembly is less compact and uses more plastic material
Solution Approach 1:
The patent introduces asymmetry in the coil arrangement by offsetting the magnetic-switch coil from the central axis. This design change enables a more compact housing that uses less plastic material while maintaining manageable structural complexity. The asymmetric layout optimizes space efficiency without significantly complicating the overall device structure.
3Ease of operation
If the terminal assembly is disposed outside the housing's outer diameter, then the coaxial coil arrangement is maintained, but the space utilization is poor and the design is less efficient
Solution Approach 1:
The patent resolves the area utilization issue by offsetting the magnetic-switch coil from the central axis. This asymmetric positioning allows the terminal assembly to fit within the housing's outer diameter, improving area utilization. The drive coil maintains its coaxial position for operational simplicity, while the offset magnetic-switch coil enables efficient space use.
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 configuration results in a more compact, cost-effective, and electrically safer starter motor assembly with improved space utilization, reducing material consumption and enhancing environmental friendliness.
Implementation Method 1
a magnetic-switch coil disposed within the housing and offset from the central longitudinal axis and configured to control an application of current to a motor
Implementation Method 2
a drive coil configured to control engagement of the driveshaft and the ring gear
Data Source
AI summary
A starter motor of a vehicle is provided and includes a housing having a central longitudinal axis and at least first and second coils disposed within the housing. One of the at least first and second coils is configured to control driveshaft and ring gear engagement and the other one of the at least first and second coils is offset from the central longitudinal axis and configured to control an application of current to a motor disposed to drive rotation of a driveshaft of the vehicle.