MVI56E-LDM

MVI56E-LDM

直流電機(jī)的優(yōu)點(diǎn)是可以方便地通過改變電壓調(diào)節(jié)轉(zhuǎn)速，并可以提供較大的轉(zhuǎn)矩。適用于需要頻繁調(diào)節(jié)轉(zhuǎn)速的負(fù)載，如鋼廠的軋機(jī)，礦山的提升機(jī)等。但現(xiàn)在隨著變頻技術(shù)的發(fā)展，交流電機(jī)也可以通過改變頻率來實(shí)現(xiàn)調(diào)節(jié)轉(zhuǎn)速。不過雖然變頻電機(jī)價(jià)格比普通電機(jī)貴不了多少，但變頻器價(jià)格在整套設(shè)備中占據(jù)主要部分，所以直流電機(jī)還有一個(gè)優(yōu)點(diǎn)是便宜。

直流電機(jī)的缺點(diǎn)在于結(jié)構(gòu)復(fù)雜，任何設(shè)備只要結(jié)構(gòu)復(fù)雜，必然導(dǎo)致故障率增加。直流電機(jī)相比于交流電機(jī)，除了繞組復(fù)雜（勵(lì)磁繞組、換向極繞組、補(bǔ)償繞組、電樞繞組），還增加了滑環(huán)、電刷和換向器。

不僅對(duì)制造商的工藝要求高，而且后期維護(hù)成本也相對(duì)較高。因此直流電機(jī)在工業(yè)應(yīng)用中是處在一個(gè)逐漸沒落但過渡階段仍有用武之地的尷尬境地。如果用戶資金比較充裕的話，建議選擇交流電機(jī)配變頻器的方案，畢竟使用變頻器也帶來很多好處，這個(gè)不細(xì)說了。

HP AGILENT 3779C PRIMARY MULTIPLEX ANALYZER OPTION 001

HP Agilent 70843A/UHF Error Detector

AGILENT/HP 70909A RF Section, 100 Hz to 26.5 GHz

Agilent DSO6034A Oscilloscope: 300 MHz, 4 channels

HP Agilent 4195A Network & Spectrum Analyzer 500MHz

HP Agilent 8510A 20 GHz Network Analyzer w/ 8514B Cal'd

Hp Agilent 86111U 750-860 nm Optical Module Opt 202

HP/Agilent 85052C Precision Mechanical Calibration Kit

HP / Agilent 8530A Network Analyzer w/ Opts. 005 / 011

Agilent - HP 4352B VCO/PLL Signal Analyzer

HP/Agilent E6000C Mini-OTDR

HP Agilent 8453 G1103A UV/Vis UV-Vis Spectrophotometer

HP Agilent 8594E Spectrum Analyzer 9kHz-2GHz Calibrated

Agilent HP 71200A/001/002/003/004 26.5GHz SA Refurbed

HP/Agilent EMI System 8568B/85650A/85685A with 85867A 

HP AGILENT 8510C NETWORK ANALYZER W/ 8514A S PARAMETER

HP Agilent 8665A Signal Generator 100KHz - 4.2GHz

HP/Agilent 8593E Spectrum Analyzer, 9 kHz to 22 GHz

Agilent HP E4422B /1E5/ Analog RF Signal Generator

HPAgilent 8595E 6.5 GHz Spectrum Analyzer 050 101 105

AGILENT HP 86121A WDM CHANNEL ANALYZER

AGILENT / HP 4145B SEMICONDUCTOR PARAMETER ANALYZER

Agilent - HP J6801A Distributed Network Analyzer

AGILENT/HP 8350B SWEEP OSCILLATOR w/ 83572A RF PLUG-IN

AGILENT/HP 8592L OPT /041 ...9KHz TO 22GHz CALIBRATED 

HP / Agilent Technologies 85309A LO/IF DistributionUnit

Agilent / HP 8648D Signal Generator

HP AGILENT 8595E 6.5 GHZ SPECTRUM ANALYZER 004 101 -J

HP Agilent 8970A Noise Figure Meter

HP Agilent 8562A Spectrum Analyzer 9 khz- 25 GHZ-40 

Agilent DSO6034A 300MHz 2GSa/s Oscilloscope 4 Channel

HP Agilent E4437B opts 202 UN8 UN9 UNA Signal Generator

AGILENT HP 89431A VECTOR SIGNAL ANALYZER 89410A 89441A

HP/Agilent V11644A Calibration Kit WR-15, 50-75 GHz

HP Agilent N3280A, NEW OPEN BOX w/ Opt 120 / 8ZJ

HP AGILENT 8595E 6.5 GHZ SPECTRUM ANALYZER 105 151 -I

Agilent HP 41501B/opt-420 Pulse Generator/Expander Unit

HP Agilent 8594E Spectrum Analyzer 9kHz-2GHz Calibrated

HP Agilent 8665A Synthesized Signal Generator 

HP/Agilent E4433B - Digital RF Signal Generator

HP/ AGILENT E4422B ESG SERIES SIGNAL GENERATOR

AGILENT HP 8594E 2.9 GHZ SPECTRUM ANALYZER 101 151 130

HP AGILENT 8166B LIGHTWAVE MULTICHANNEL SYSTEM

AGILENT HP U2002A USB Power Sensor 50MHz-24GHz OPT 100

Agilent HP 8562A Spectrum Analyzer

AGILENT hp 16900A LOGIC ANALYZER (3) 16754A MODULES #1

AGILENT hp 16900A LOGIC ANALYZER (3) 16754A MODULES #2

Agilent DSO5034A Oscilloscope: 300 MHz, 4 channels

HP Agilent 8902A + 11722A Measuring Receiver + Sensor

HP/Agilent E4434B RF Signal Generator 250kHz to 1GHz

HP/Agilent E4430A ESG-D1000A Signal Generator 1GHz

HP Agilent 4352B VCO/PLL SIGNAL ANALYZER Refurbished

HP/Agilent 81655A Laser Source Module (FP) 1310nm 13

HP Agilent 8562A Spectrum Analyzer, 9KHz to 22GHz