MVI56E-LDM 通讯MVI56E-LDM模块

MVI56E-LDM

MVI56E-LDM

直流电机的优点是可以方便地通过改变电压调节转速，并可以提供较大的转矩。适用于需要频繁调节转速的负载，如钢厂的轧机，矿山的提升机等。但现在随着变频技术的发展，交流电机也可以通过改变频率来实现调节转速。不过虽然变频电机价格比普通电机贵不了多少，但变频器价格在整套设备中占据主要部分，所以直流电机还有一个优点是便宜。

直流电机的缺点在于结构复杂，任何设备只要结构复杂，必然导致故障率增加。直流电机相比于交流电机，除了绕组复杂（励磁绕组、换向极绕组、补偿绕组、电枢绕组），还增加了滑环、电刷和换向器。

不仅对制造商的工艺要求高，而且后期维护成本也相对较高。因此直流电机在工业应用中是处在一个逐渐没落但过渡阶段仍有用武之地的尴尬境地。如果用户资金比较充裕的话，建议选择交流电机配变频器的方案，毕竟使用变频器也带来很多好处，这个不细说了。

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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

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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

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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

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Agilent DSO6034A 300MHz 2GSa/s Oscilloscope 4 Channel

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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

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

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

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