MVI56E-LDM

MVI56E-LDM

直流電機的優點是可以方便地通過改變電壓調節轉速，并可以提供較大的轉矩。適用于需要頻繁調節轉速的負載，如鋼廠的軋機，礦山的提升機等。但現在隨著變頻技術的發展，交流電機也可以通過改變頻率來實現調節轉速。不過雖然變頻電機價格比普通電機貴不了多少，但變頻器價格在整套設備中占據主要部分，所以直流電機還有一個優點是便宜。

直流電機的缺點在于結構復雜，任何設備只要結構復雜，必然導致故障率增加。直流電機相比于交流電機，除了繞組復雜（勵磁繞組、換向極繞組、補償繞組、電樞繞組），還增加了滑環、電刷和換向器。

不僅對制造商的工藝要求高，而且后期維護成本也相對較高。因此直流電機在工業應用中是處在一個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，建議選擇交流電機配變頻器的方案，畢竟使用變頻器也帶來很多好處，這個不細說了。

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