Motor Inverter Layout With Parallel Shaft Assembly
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Solution Overview
Problem
Conventional motor driving systems face issues with inverter placement and connection, leading to inefficient use of space, complex assembly, and increased design and manpower requirements due to differing coupling directions and the need for separate bus bars, especially when the motor size increases horizontally.
Innovation Solution
A motor system design where the inverter is positioned parallel to the motor shaft, with the inverter's power module, cooler, and control board integrated in a hollow structure that includes a rotation angle detector and temperature detector, allowing direct connection to the motor bus bar and maintaining the initial connection structure even with increased motor size, thus simplifying assembly and reducing space constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the inverter is coupled to the upper portion of the motor, then the motor system can be assembled, but the upper space of the motor is blocked and cannot be utilized
Solution Approach 1:
The inverter is repositioned from the upper portion of the motor to a lateral position, changing the spatial arrangement from vertical stacking to horizontal parallel alignment. This dimensional change allows the upper space to remain open and usable while maintaining the inverter's functional connection to the motor through the shaft end portion.
2Ease of operation
If the reducer and inverter are disposed with different coupling directions, then both components can be installed, but assembly workability deteriorates due to different fastening directions
Solution Approach 1:
The inverter is positioned asymmetrically at the lateral side of the motor with its coupling direction aligned parallel to the motor shaft direction, rather than symmetrically at the upper portion. This asymmetric arrangement creates uniform coupling directions for both the reducer and inverter, improving assembly workability by allowing fastening bolts to be installed in the same direction.
3Power
If the motor size increases horizontally, then the motor can provide required torque, but the inverter installation position and connection structure must be changed
Solution Approach 1:
The inverter connection structure is designed to be universal by coupling it to the motor shaft end portion rather than the upper portion. This allows the inverter to be positioned laterally in parallel with the motor shaft, creating a standardized connection that remains valid regardless of motor size increases in the horizontal direction, eliminating the need for redesign.
4Productivity
If separate bus bars are used for inverter to motor connection, then electrical connection can be established, but assembly time and cost increase
Solution Approach 1:
The inverter and motor are positioned in close proximity with the inverter coupled directly to the motor shaft end portion, allowing the electrical connection to be integrated into the mechanical coupling structure. This merging of mechanical and electrical connection functions eliminates the need for separate bus bars and connectors, reducing assembly steps and cost.
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 design maintains the initial connection structure as the motor size increases, reduces design and assembly time, secures upper space for additional components, and improves assembly efficiency by eliminating separate connectors and simplifying bus bar connections, while reducing costs through integrated detectors and direct power transmission.
Implementation Method 1
a rotation angle detector disposed at a periphery of the permanent magnet, and configured to detect a magnetic field change due to rotation of the permanent magnet during rotation of the shaft to detect a rotation angle of the motor
Data Source
AI summary
A motor system includes a motor including a motor cover and a shaft of which a first end portion is exposed to an outside of the motor cover, a permanent magnet provided at the exposed first end portion of the shaft, and a rotation angle detector disposed at a periphery of the permanent magnet, and configured to detect a magnetic field change due to rotation of the permanent magnet during rotation of the shaft to detect a rotation angle of the motor.