Rotation Driving Device Eccentricity Adjustment for Axial Blower
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to increase the rotation speed of axial blowers in laser oscillators while preventing a decrease in the bending natural frequency, which is hindered by the lowering of the bending natural frequency as rotation speed increases.
Innovation Solution
A rotation driving device is designed with a rotating shaft, rotor, stator, and magnetic bearings, where the rotor and stator are concentrically arranged with an eccentricity adjusting mechanism to maintain alignment and reduce magnetic attraction force, allowing for high-speed operation without lowering the bending natural frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotation speed of the axial blower is increased to improve cooling performance, then the cooling efficiency is improved, but the bending natural frequency decreases
Solution Approach 1:
The motor is divided into separate components (rotor, stator, magnets) that can be independently positioned and adjusted. This segmentation allows for precise alignment of the rotor and stator axes while maintaining high rotation speed, thereby preventing the decrease in bending natural frequency that would normally occur with increased speed.
Solution Approach 2:
The position of the rotor relative to the stator is adjusted in advance during assembly using the adjustment member (screw). This preliminary positioning ensures that the central axes are aligned before operation begins, preventing vibration and frequency degradation that would otherwise occur at high rotation speeds.
2Productivity
If the rotation speed is increased to improve gas circulation, then the cooling performance is improved, but magnetic attraction force increases causing alignment issues
Solution Approach 1:
The rotor position is preliminarily adjusted during assembly using the adjustment member to ensure proper alignment between the rotor and stator central axes. This preliminary positioning compensates for any misalignment that would be exacerbated by magnetic attraction forces during high-speed operation, maintaining both gas circulation efficiency and alignment precision.
Solution Approach 2:
The adjustment member (screw) acts as an intermediary mechanism between the rotor and stator, allowing for precise control of the rotor position. This intermediary device enables fine-tuning of the alignment to counteract the effects of magnetic attraction forces that occur during high-speed rotation, maintaining both productivity and precision.
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 solution enables high-speed rotation of the axial blower, improving gas circulation and cooling performance while reducing the size and weight of magnetic bearings, thus preventing a decrease in bending natural frequency and maintaining efficient operation.
Implementation Method 1
attraction force between the permanent magnet of the rotor and the stator core that is a magnetic member
Data Source
AI summary
A rotation driving device includes: a casing; a stator holding part; a cylindrical member; a flange extending from an end of the cylindrical member in the axial direction toward a rotating shaft, and facing an end of the stator holding part in the axial direction; and a fastening member fastened to the end of the stator holding part in the axial direction via the flange. The flange has a through-hole extending through the flange in the axial direction, and in which the fastening member is inserted. The through-hole has a diameter smaller than that of a head of the fastening member, and larger than that of a screw part of the fastening member. The rotating shaft, the rotor, the stator, the stator holding part, and the cylindrical member are arranged in this order in the radial direction in the casing, and are concentrically arranged.