電機(jī)運行電磁噪音增加。變頻器輸出的是矩形波電壓，存在高頻分量，因此電機(jī)會產(chǎn)生刺耳的高頻噪音，該噪音明顯大于風(fēng)機(jī)的噪音，給噪音測量帶來了難題。

廈門岳航計算機(jī)工程有限公司

聯(lián)系人：李素云

企業(yè)QQ：2851195446，2851195466

手機(jī)：18965423501

座機(jī)：0592-5165501

(3)電機(jī)溫升升高。變頻器輸出電壓波形不是正弦波，而是畸形波，在額定扭矩下的電機(jī)電流比工頻時要多出約10%左右，所以溫升比工頻時略有提高(低次電流諧波使銅損增大，高次諧波使鐵損增大)，給電機(jī)溫升試驗帶來不便，使得溫升試驗結(jié)果偏差較大。

(4)普通電磁、數(shù)字測試儀表失靈。變頻器的輸入電流和輸出電流中都有頻率較高的高次諧波成分，高次諧波電流所產(chǎn)生的電磁場具有輻射能力，使其他設(shè)備(尤其是通信設(shè)備)因接收到電磁波信號而受到干擾，使得電磁式儀表、數(shù)字式儀表都不能用來直接測量交流電壓和電流，必須采用整流式儀表才能進(jìn)行較為準(zhǔn)確的測量。

變頻器是可以改變頻率和電壓的電源。變頻器是由交流-直流-交流(調(diào)制波)等電路構(gòu)成的，將電網(wǎng)三相交流電經(jīng)過三相橋式整流成脈動直流，再通過電解電容和電感濾波成平滑直流，*后通過逆變器，逆變成電壓和頻率可調(diào)的三相交流電。變頻器標(biāo)準(zhǔn)叫法為變頻調(diào)速器。

變頻器的輸入電路是三相交流電源經(jīng)全波整流后向濾波電容器充電的電路，輸入電流總是出現(xiàn)在電壓的振幅值附近，呈不連續(xù)的沖擊波形式，如圖2所示，變頻器的輸出電路是把直流變成頻率連續(xù)可調(diào)的三相調(diào)制交流電壓的逆變橋電路，其輸出電壓波形是正弦調(diào)制spwm波，如圖3所示。

Olympus HMTV-1 X1.5 C-Mount Lens

Justrite 10208 Plunger Can, 2 QT CAP(US) / 1.9 Liters

Honeywell CR71B1054 Four Stage Chiller, 120V, 60Hz

Melles Griot 59 LGF 412-S Lens

Melles Griot 59 LGF 412-L Lens

New Box of 6 CART-GAC20-IND-SHR 155111-03 Granular Activated Carbon Filter

Olympus H100-012-090 HMTV-1 Probe

Mitutoyo 378-801 M Plan Apo 2 Lens (for parts)

Olympus PE 3.3X 125 Microscope Photo Eyepiece 27mm x 51mm Overall

Flanders Pureform 0-007-F-02-03 HEPA Filter 1000CFM 24" x 24" x 11.75"Thick

Combustion Engineering Fulscope ER/C Circular Chart Recorder 120/240V 50/60Hz

Electrothermal CM1000C Heating Mantle 110/120V 50/60Hz, 300W, 450C Max

R&D BOX OVEN 36" x 36" x 22.5" 120V

JPSA Mask Mount Block Adjustable 2-Axis 6.5mm Range 1 3/4" Aperture

JPSA A00014-MIC Focus Lens Mount 3-Axis Control 1 1/2" Aperture Diameter

JPSA A00560 Homogenizer Lens in Mount 1/2" x 1" 2" ID Mount

Opto Sigma 014-1400 Fused Silica liano Convex Lens with Mount 500mm Focal Length

JPSA UVM-2-.375-248HR45 Turning Mirror 90° 2-Axis Adjustable 1 3/4" Diameter

SPX / Blue M Oven Door 29 3/4" x 42 3/4" x 4 1/2" Thick 3 Latch 1 Handle 3 Hinge

Vented Enclosure Attached to Workbench 41" x 28" x 16 3/4" Enclosure 3/4" Thick

Parker LT10V Single Filter Cartridge Vessel 3" Inner Diameter 10" Depth 3/4" NPT

Filter Housing 3" Inner Diameter, 10" Depth 3/4" NPT Outlet/Inlet w/Metal Filter

Filter Housing 5-1/4" Inner Diameter, 10-1/4" Depth, 1" NPT Outlet/Inlet

Filter Housing 3" Inner Diameter, 9" Depth, 1/2" NPT Outlet/Inlet

Filter Housing 3-1/2" Inner Diameter, 9" Depth, 3/4" NPT Outlet/Inlet

Associated Environmental Systems SD601SLC Environmental Chamber w/AES 86648

Winthrop Pharmaceuticals 712214 Contrast Media Warmer *For Parts, Not Working*

Drucker 853VES Fisher Heal Horizon Plasmafuge-12 *For Parts, Not Working*

Lab-Line 4682 Digital Reciprocating Water Bath Shaker, 120VAC, 11.66A, 1400W

Neslab Shandon Histobath 2 Low Temperature Freezing Bath *Parts Only*330106-05-30-05-02-00

330106-05-30-10-02-05

330130-040-00-00

330130-040-01-00

330130-045-00-00

9563-810

9853-610

DSAI110 57120001-DP

M3575R-H33BF

M68CPU CPU

MC-4/11/01/400

S-D4006-D

S-D4006-D S-D4006

S-D4008-A S-D4008

SM 25/50-TCT DC 560V 25A 06231-103

SR 469 469-P5-HI-A20

1336F-BRF200-AN-EN

1336F-BRF200-AN-EN

BS206 BIO420 BIO420/00

BS204 BIO246 BIO246/00

BS205 BIO413 BIO413/00

1336-BDB-SP6A

Olympus Training Adapter for Microscopes (no eyepieces)

Techniquip TLC-5 Fluorescent Ring Light 120V

Nikon 10x/21 10x Microscope Eyepiece (light scratches on lens)

Nikon 10x/21 10x Microscope Eyepiece

Aerotech A0M105-2 Gimbal Optical Mount for 2" Dielectric Lens

Aerotech A0M105-2 Gimbal Optical Mount with 2" Dielectric Lens

NIB Cleanline M3636-6B Blue Cleanroom Mats 36" x 36" 6 Packs of 40 240 Total

WF20X/10 Microscope Eyepiece 20x Widefield