Stator Position Adjustment for Motor Drive Vibration Control
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Solution Overview
Problem
Hybrid motor drive devices experience stator-induced vibration and resonance due to improper positioning of the stator within the motor case, leading to inefficiencies and noise generation.
Innovation Solution
A stator position adjustment method that sets specific tolerance ranges for the stator axis to maintain a predetermined gap between the stator and motor case, and between the stator and rotor, using a measurement and adjustment system to precisely position the stator within these ranges, thereby preventing contact and resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stator is positioned using conventional tolerance ranges, then the stator can be assembled without precise positioning, but the stator may contact the motor case or rotor causing vibration and resonance
Solution Approach 1:
The patent applies parameter changes by establishing specific tolerance ranges for the stator axis position (first tolerance range for gap with motor case, second tolerance range for gap with rotor) that are more precise than conventional tolerances. This resolves the contradiction by maintaining ease of manufacture through defined assembly parameters while ensuring reliability by preventing stator contact with motor case or rotor through controlled positioning within these parameter ranges.
2Stability of the object's composition
If the stator is tightly secured to the motor case, then the stator position is fixed, but the stator cannot be adjusted to achieve proper centering
Solution Approach 1:
The patent applies preliminary action by measuring and adjusting the stator axis position to within the specified tolerance ranges before final tightening of the securing bolts. This resolves the contradiction by enabling precise centering adjustment while maintaining stable fixation, as the stator is positioned accurately prior to being permanently secured to the motor case.
3Productivity
If the stator gap with motor case is reduced to improve efficiency, then the motor case space is utilized better, but the stator may contact the motor case causing resonance
Solution Approach 1:
The patent applies parameter changes by defining the first tolerance range that specifies the minimum acceptable gap between the stator outer circumference surface and motor case inner circumference surface. This resolves the contradiction by maintaining high productivity through efficient space utilization while preventing harmful resonance and vibration by ensuring the gap parameter remains within the specified tolerance range, avoiding stator contact with the motor case.
Data Source
AI summary
A stator position adjustment method for a motor drive device that includes a motor case, a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case, and a stator disposed at an outer circumference of the rotor concentrically with the rotor and having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis. The method includes the steps of setting a first tolerance range as a maximum tolerance range of a stator axis in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case; measuring a position of the stator axis; and adjusting the position of the stator axis within the first tolerance range based on a measured position of the stator axis.