• Title/Summary/Keyword: Vibration Motor

Search Result 1,348, Processing Time 0.028 seconds

Transient Vibration Analysis of a Rotary Compressor Considering the Coupled Effects of Motor (모터의 연성을 고려한 로터리 압축기의 과도진동 해석)

  • 정의봉;김정훈;안세진;황선웅
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.12 no.11
    • /
    • pp.847-855
    • /
    • 2002
  • A rotary compressors are used most widely In air-conditioning systems. Noise and vibration of a rotary compressor is an important problems during turning on and off as well as during operating. To estimate the vibration occurring during turning on and off, vibration analysis of a motor-compressor coupled system is required. In this paper, through modeling the motor and solving the forces from the equations of motion of the moving parts, the analysis of vibration of the compressor taking into consideration of the effects of motor and moving parts was performed. The accelerations of accumulator during turning on. turning off and operation are simulated. And simulated accelerations are compared with those of experimental data.

The Experimental Analysis of Aerodynamic Sound for Fan Motor in a Vacuum Cleaner Using Laser 3-D Scanning Vibrometer and Microphone (레이저 3차원 진동측정기와 마이크로폰을 이용한 진공청소기용 팬모터의 실험적인 공력소음 분석)

  • Kwac Lee-Ku;An Jae-Sin;Kim Jae-Yeol
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.22 no.3 s.168
    • /
    • pp.46-51
    • /
    • 2005
  • The vacuum cleaner motor runs at very high speed for suction power. Specially, motor power is provided by the impeller being rotated at very high speed. The centrifugal fan consists of the impeller, the diffuser, and the circular casing. Due to the high rotating speed of the impeller and small gap distance between the impeller and the diffuser, the level of noise in the centrifugal fan is at BPF(Blade Passage Frequency) and its harmonic frequencies. In order to calculate the sound pressure of centrifugal fan, unsteady flow data are needed. The cause of noise is obtained by dividing the fluid noise by exhaust flow of fan and vibration noise by rotational vibration of vacuum cleaner fan motor. Until now, an accelerometer has been used to measure vibration. However, it can not measure vibration in some parts of brush and commutator because of motor construction and 3-D vibrating mode. This study was conducted to perform accurate analysis of vibration and aerodynamic sound for fan motor in a vacuum cleaner using a laser vibration analyzer. A silent fan motor can be designed using the data measured in this study.

A Study on the Characteristic of Noise and Vibration in 3-phase Induction Motor for the Forklift (전동 지게차용 3상 유도 모터의 소음 진동 특성에 대한 연구)

  • Kim, Woo-Hyung;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.19 no.1
    • /
    • pp.3-9
    • /
    • 2009
  • This paper presents the reduction of acoustic noise generated by electromagnetic force in an induction motor of the electrical forklift. After summarizing the electromagnetic excitation forces due to the interaction between the stator/rotor slot permeance and the stator winding magnetomotive force, the effects of the electromagnetic force on the noise and vibration of an induction motor are analyzed. In order to experimentally identify the noise sources of the motor, the signal analyses for noise and vibration are performed by using waterfall plots of noise and vibration spectrums. It is found that severe noise and vibration are caused by the electromagnetic force when the mode number of the excitation shape for a stator is low. Furthermore, it is verified that the motor noise is amplified if the excitation frequency of the electromagnetic force coincides with one of the natural frequencies of the stator. It is experimentally demonstrated that this severe noise can be considerably reduced by structure modifications. Finally, some design guidelines are suggested to develop an induction motor with a low level of noise.

Development of Vibration Motor Using Coreless Permanent Magnet DC Motor (무철심 영구자석 직류 모터를 이용한 진동자 개발)

  • Hwang, Sang-Moon;Chung, Shi-Uk
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.16 no.7
    • /
    • pp.15-23
    • /
    • 1999
  • With a remarkable expansion of communication industry, a pager or a cellular phone becomes a necessary communication device in modern society. However, a paging signal by a buzzer is often acted as an unpleasant noise in some places, thus necessitating a paging signal by a vibration motor. In this paper, a simpler type of a vibration motor, a coreless permanent magnet(PM) DC motor, is considered to substitute for the conventional vibration motors. Using an analytical method, electromagnetic field and operating torque were calculated for the given inner and outer PM type motors, and the results were confirmed by FEM analysis. As design parameters, number of PM poles, PM radial thickness, coil arc angle and number of winding stacks were chosen for sensitivity analysis. It shows that coil arc angle is the most important design parameter to increase the motor performance, without giving an adverse effect on motor weight, size and manufacturing cost. Based on the analysis of the outer PM type motor, an outer square PM type motor is proposed as the final design. Compared to the outer PM type, outer square type provides more flexibility to attach to the small size cellular phones. With the optimum design of square outer PM DC motor, it can successfully substitute the conventional types with less expensive manufacturing cost. better performance and smaller necessary space.

  • PDF

The vibration and noise characteristic analysis of the BLDC Axial-gap type motor by using Finite Element Method (FEM 을 이용한 BLDC Axial-gap type 전동기의 진동과 소음 특성 분석)

  • Lee, Taeck-Jin;Park, Jun-Hong;Lee, Sang-Ho;Hong, Jung-Pyo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.11a
    • /
    • pp.943-946
    • /
    • 2007
  • The vibration and noise characteristic of the Axial-gap motor for an air conditioner were analyzed. Experimental Modal Analysis was performed to understand the vibration characteristic of the motor. The noise of motor was measured in a dead room. Finite Element Method was performed to find the vibration characteristic of the motor by using ABAQUS program.

  • PDF

Optimum Design of Linear Motor by Using Taguchi Method (다구찌 기법을 이용한 선형 모터의 최적 설계)

  • Seol, Jin-Soo;Lee, Woo-Young;Rim, Kyung-Hwa
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2005.11a
    • /
    • pp.192-195
    • /
    • 2005
  • Nanometer operating linear motor is difficult to control the nano-positioning because of the vibration between structures changing of mechanical friction force happened by properties of the vibration and heat caused by operating of a mover. Therefore, it is required to analysis the vibration and heat about a mover. In this paper, we will analyze the property of vibration through analyzing by using FEM a mover of linear motor developed in the non-load situation and suggest the direction of optimal design about a mover by using method of DOE, also try to find the solution to operate the linear motor stabilized through the reducing weight of mover considering the vibration.

  • PDF

Study on Acoustic Resonance of Air-conditioner Fan BLDC Motor (에어컨 홴 BLDC 전동기의 음향공진에 관한 연구)

  • Lee, Hong-Joo;Kwon, Joong-Hak;Lee, Chang-Min;Hwang, Gun-Yong;Hwang, Sang-Moon
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.19 no.9
    • /
    • pp.863-869
    • /
    • 2009
  • Acoustic noises generated during motor operation in mechanical system are from electromagnetic, mechanical, aerodynamic and electrical sources. For identification of mechanical noise origins, misalignment, unbalance, fan shape, resonance, and vibration modes have been extensively considered to describe noise behavior. An experiment-based approach as well as a mathematical approach needs to be adopted for a realistic study into noise and vibration of the motor, because motor noise characteristics differ from type to type due to various noise sources. This paper analyzes noise characteristics of a brushless DC motor for air-conditioner fan, and proves that the test motor noise originates from acoustic modes of airspace in the motor. The motor noise sensitivity analysis by design of experiments reveals that the noise characteristics are closely related to switching frequency and frame thickness.

The countermeasure for the Vibration Problem of Turbo Chiller (300RT) (300RT급 터보냉동기 진동원인 분석 및 해결방안)

  • 김관영;홍제민;배종국
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.05a
    • /
    • pp.184-188
    • /
    • 2001
  • Severe vibration was detected during test operation in motor frame of the Turbo Chiller (300RT). To identify the vibration problem, vibration measurement and modal test were carried out. From the test results, it is concluded that the severe vibration occurred due to the resonance between the motor frame horizontal mode and the motor excitation frequency. Therefore the horizontal mode of the frame could be controlled by the sensitivity analysis results for the length of the supporting plate.

  • PDF

Vibration Analysis of Rotary Compressors Considering the Coupled Effect of Motor (전동기의 연성을 고려한 로터리 압축기의 진동 해석)

  • 정의봉;황선웅;안세진;김정훈
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.1055-1060
    • /
    • 2002
  • The noise and vibration of rolling piston-type compressors used in the most of the airconditional system is a serious and important problem occurred during turning on and off as well as during operating. To analyze the vibration occurred during turning on and oft, the vibration analysis of motor-compressor coupling is required. In this paper, through modeling of the motor, solving the force from the equations of motion of the moving parts and considering the stiffness of the rubber mounts, the analysis of vibration was performed.

  • PDF

A Study on the Characteristic of Noise and Vibration in 3-Phase Induction Motor for the Forklift (전동 지게차용 3 상 유도 모터의 소음 진동 특성에 대한 연구)

  • Kim, Woo-Hyung;Chung, Jin-Tai
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.11a
    • /
    • pp.764-769
    • /
    • 2007
  • This paper is studied the noise and vibration characteristics analysis of the three-phase induction AC motor of the electrical forklift. And we suggest the method which the reduction orders the noise and vibration to be the mechanical. In other to investigate these characteristics, we considered the mechanical characteristics, the electromagnetic effects, and these interactions. In mechanical, we studied the characteristic of the stator, the bearing supported condition of the rotor, and the sound radiation. In electronically, this paper is considered the harmonic effect which is related the magnetic motive force (mmf) with respect to the characteristic of the slot number of the rotor and the stator and the pole number of the motor. Finally we investigated the overall noise and vibration of the induction motor by relations between the electronically harmonic and the mechanical resonance of the stator. By the analysis of the generally three-phase induction motor, we suggest the design methodology to low noise and vibration.

  • PDF