• Title/Summary/Keyword: Motor Acoustic Noise

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Reduction Characteristics of Vibration and Acoustic Noise of SRM Using Hybrid Excitation Method (하이브리드 여자방식을 이용한 SRM의 진동 소음 저감 특성)

  • Kim, Chang-Seop;O, Seok-Gyu;An, Jin-U
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.9
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    • pp.438-444
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    • 2001
  • The simple motor construction and low cost, fault tolerant power electronic drive has made the switched reluctance drive a strong contender for many applications. But the switched reluctance drive does exhibit higher levels of vibration and acoustic noise than that of most competing drives. The main source of vibration in the switched reluctance drive is generated by rapid change of radial force when phase current is extinguished during commutation action. In this paper, a hybrid excitation method is proposed to reduce vibration and acoustic noise of the switched reluctance drive. The hybrid excitation has 2-phase excitation by long dwell angle as well as conventional 1-phase excitation. The vibration and acoustic noise are reduced because the scheme reduces abrupt change of excitation level by distributed and balanced excitation.

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Acoustic Noise Reduction and Power Factor Correction in Switched Reluctance Motor Drives

  • Rashidi, Amir;Saghaiannejad, Sayed Mortaza;Mousavi, Sayed Javad
    • Journal of Power Electronics
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    • v.11 no.1
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    • pp.37-44
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    • 2011
  • In this paper, a four-phase 8/6-pole 4-kW SR motor drive model is presented. Based on experimental data, the model allows an accurate simulation of a drive in dynamic operation. Simulations are performed and a laboratory type set-up is built based on a TI TMS320F2812 platform to experimentally verify the theoretical results obtained for a SR motor. To reduce acoustic noise and to correct the power factor of this drive, a two-stage power converter is proposed that uses a current source rectifier (CSR) as the input stage for the asymmetrical converter of the studied SRM. Employing the space-vector modulation (SVM) method in matrix converters, the CSR switching allows the dc link's capacitors to be eliminated and the power factor of the SRM drive to be improved. As the electrical motive force (emf) is directly proportional to the rotor speed, the input voltage to the machine can be programmed to be a function of the speed with the modulation index of the CSR, leading to a reduction in the acoustic noise of the SRM drive. Simulation of the whole SRM drive system is performed using MATLAB-Simulink. The results fully comply with the required conditions such as power factor correction with an improvement in the THD.

A Permanent-Magnet Linear Motor Shape Optimal Design Using Coupling Particles Swarm Optimization

  • Baatar, Nyambayar;Pham, Minh-Trien;Koh, Chang-Seop
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.788_789
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    • 2009
  • The cogging force of a permanent-magnet linear motor is a major component of the detent force, but unfortunately makes a ripple in the thrust force and induces undesired vibration and acoustic noise. In this paper, Coupling Particles Swarm Optimization is applied to optimization the shape of permanent magnet linear motor by minimizing the undesired vibration and acoustic noise in the thrust force and also considering the maximum thrust force. The result shows that the 9-pole 10-slot PMLM removes almost of the cogging force while giving a big thrust force.

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Simulation and Design of Surface Acoustic Wave Motor with Wide Bandwidth (IDT 구조변경을 통한 광대역 표면 탄성파 선형 모터의 시뮬레이션)

  • Kim, Jae-Geun;Lim, Soo-Cheol;Lee, Taek-Joo;Park, Na-Cheol;Park, Young-Pil;Park, Kyaung-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.223-225
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    • 2008
  • In this study. we propose a wide bandwidth surface acoustic wave (SAW) motor by design of Inter Digital Transducer (IDT). SAW motor has several benefits compared with preexisted actuator. But it has narrow bandwidth, which causes the lower performance. To widen the bandwidth, the change of IDT structure was proposed, which is slanted IDT and since function apodization. The frequency responses were compared original uniform IDT and changed IDT. And the time responses were compared original uniform IDT and changed IDT. As a result, the feasibility of wide bandwidth SAW motor was certified.

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Characteristics Analysis and Comparison of Careless and Slotless BLDC Motor used in Digital Lightening Processor Motor with Air-Dynamic Bearing (공기 동압 베어링을 갖는 디지털 라이트닝 프로세서 모터용 코어리스 및 슬롯리스 BLDC 모터의 특성 분석 및 비교)

  • Yang, Iee-Woo;Kim, Young-Seok;Kim, Sang-Uk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.6
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    • pp.1039-1046
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    • 2007
  • This paper presents the analysis for power consumption, mechanical vibration and acoustic noise characteristics of the Coreless and Slotless Brushless DC motor in Digital Lightening Processor(DLP) Motor with the Air-Dynamic Bearing. The Coreless BLDC motor has not the stator yoke as well as the stator slot to remove the unbalance force by the interaction between the stator yoke and Air-Dynamic Bearing clearance. The assembling tolerance and the processing error make the air-gap difference between the magnet and the stator yoke .which occurs the unbalanced electro-magnetic force in the Slotless BLDC motor. It imposes the air-dynamic bearing on the disturbance force and makes the Air-Dynamic Bearing vibrated and noised. Also, The attractive force between the magnet and the silicon steel stator yoke increases the power consumption. In this paper, the power consumption, mechanical vibration and acoustic noise of the Coreless BLDC motor and the Slotless BLDC motor with the silicon steel stator yoke are simulated, analyzed, and tested using the manufactured proto-type motors with Air-Dynamic bearing. The simulated and tested results present that the Coreless BLDC motor without the silicon steel stator yoke has the lower mechanical vibration and noise ,and lower power consumption than the Slotless BLDC motor with the silicon steel stator yoke in Digital Lightening Processor Motor with Air-Dynamic Bearing.

Acoustic Noise Reduction of A SRM for Fan in Air conditioner (에어컨 팬 모터용 SRM의 소음 저감)

  • Lee, Dong-Il;Shin, Hyoun-Jeong;Lim, Jun-Young;Han, Seung-Do
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.816-821
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    • 2002
  • It is getting more important that energy efficiency and manufacturing cost of the electric motor in appliance. The SRM has been alternative choice. But acoustic noise and harshness in this motor was widely known. So this paper had been studied on the noise reduction of a SRM in air conditioner. This works include some parameters regarding to blown noise sources like a reluctance torque ripple, air gap eccentricity, Especially, it was focused on dynamic characteristics of the system based on mechanical viewpoint. It came to successful results. Besides, this gave us a validity of phase excitation in experimental measurements.

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A New Three-Phase Lead-Lag Random Pulse Position PWM Scheme for Decreasing Audible Acoustic Noise of Motor Drives (모터 구동 장치의 가청 소음 저감을 위한 새로운 3상 Lead-Lag 랜덤 펄스 위치 PWM 기법)

  • Wi, Seok-O;Jeong, Yeong-Guk;Im, Yeong-Cheol;Na, Seok-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.7
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    • pp.387-398
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    • 2002
  • In this paper, a new Three-Phase Lead-Lag Random Pulse Position PWM(LL-RPWM) scheme is proposed and implemented for decreasing audible acoustic noise of motor drives. In the proposed RPWM(Random PWM), each of three phase pulses is located randomly in each switching interval. Based on the space vector modulation technique, the duty ratio of the pulses is calculated. Along with the randomization of the PWM pulses, we can obtain the effects of spread spectra of voltage, current as in the case of randomly changed switching frequency. To verify the validity of the proposed LL-RPWM, the simulation and experimental study was tried. Along with the randomization PWM pulses, the space vector modulation is also executed in the C167 micro-controller. The simulation and experimental results show that the voltage and current harmonics are spread to a wide band area and that the audible acoustic noise is reduced by the proposed RPWM method.

A Comparative Study on the Performance of Two-Phase and Three-Phase Randomized Pulse Position PWM Scheme for Mitigation of Audible Switching Acoustic Noise in Motor Drives (모터 구동 장치의 가청 스위칭 소음 저감을 위한 2상 및 3상 랜덤 펄스 위치 PWM기법의 성능 비교)

  • 정영국;위석오;나석환;임영철
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.3
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    • pp.224-236
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    • 2002
  • In this paper, a comparative study on the performance of two-phase and three-phase randomized pulse position PWM scheme for mitigation of audible switching acoustic noise in motor drives is done. In the randomized Pulse Position PW, each of two-Phase or three-phase PWM Pulses is located randomly in each switching interval. Simulation and experimental efforts were executed to investigate the spread effects of Power spectra of inverter output voltage, waveforms of ripple current and audible switching acoustic noise. As results, two-phase RP% scheme is more effective from the viewpoint of switching loss and ease of implementation while the three-phase RPWM scheme is more effective from the viewpoint of the spread effects of power spectra. Also, from the view point of the audible switching acoustic noise in motor drives, two-phase and three-phase RPW schemes are nearly the same.

A Study On The Acoustic Noise Characteristics of Hard Disk Drive Due To The Structural Excitation Of Spindle Motor (하드디스크 드라이브에 있어서 스핀들모터의 구조적 가진에 따른 시스템의 소음 특성에 관한 연구)

  • Son, Young;Hwang, Tae-Yeon;Kang, Seong-Woo;Han, Yun-Sik;Koo, Ja-Choon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1549-1554
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    • 2000
  • HDD structure is excited by the dynamic motion of disk-spindle motor components. Those excitations which are generated at stator and magnet rotor, at bearings and from disk dynamics, are transmitted through motor spindle and flange to HDD cover and base. The operational deflection shape measurement can show the structural excitation patterns at the most influent frequency on the acoustic noise level. One of those components is the axial excitation along spindle, and the other is the local orbital excitation at contact area of motor flange and base. To make a reduction of those structural transmission excitations, the structure of spindle motor is modified to the direction of reinforcement at transmission path without change of bearings, magnet and coil. Some excitation of spindle motor component carrying out essential function is unavoidable. So it is the efficient way of HDD noise improvement to control the structural transmission of excitation.

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