描述
直流电机的启动电流与直流电机的电枢回路的直流电阻有关。因为启动时电枢绕组的反电势(与电机转速、电枢磁通等成正比)为零,所以外加直流电压全部加在电枢绕组上,所以启动电流等于电源电压除以电枢绕组直流电阻,一般电枢绕组直流电阻数值较小,仅为电机额定负荷电阻的5%~10%,所以,如果不采取限流措施,直流电机启动电流高达额定电流的10~20倍,造成电枢绕组和电机换向器烧毁。一般因采用限流电阻分级启动方式或其他方式限制电机启动电流,使启动电流不超过额定电流的1.5~2倍。详细情况查阅相关电机资料,一般电机学、拖动类教材及电工手册中都有讲述。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
Symmetricom GPS Timing Antenna 58534A-H01
Symmetricom Model Z3827A Timing Receiver Unit
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Symmetricom DATUM X72
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HP AGILENT 58502A SYMMETRICOM DISTRIBUTION AMPLIFIER
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Symmetricom Telecom Solutions 090-40010-01 CI DCD
Symmetricom Telecom Solutions 090-40011-02 Iss A TOCA
Symmetricom Telecom Solutions 090-40022-07 iss A TOGA
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SYMMETRICOM 090-40013-01-IS?S-A
Symmetricom DS1 Output Module 23413017-000-0
Symmetricom TimeExpander Network Timing Expander Manual
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TrueTime Symmetricom NTS-200 Network Master GPS Clock
Symmetricom TrueTime NTS-200 Network Master GPS Clock
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TrueTime Symmetricom NTS-200 Network Master GPS Clock
TrueTime Symmetricom NTS-200 GPS Network Master Clock
TrueTime Symmetricom NTS-200 GPS Master Network Clock
HP/AGILENT/SYMM?ETRICOM 55412A ITH CARD FOR A 55400A NSU
HP/AGILENT/SYMM?ETRICOM 55481A CARD 55400A NETWORK UNIT
HP/AGILENT/SYMM?ETRICOM 55485B CARD 55400A NETWORK UNIT
HP/AGILENT/SYMM?ETRICOM 55482A CARD 55400A NETWORK UNIT
DATUM SYMMETRICOM GPS LC E1 FRAMER OCXO
ALVARION SYMMETRICOM 111-03850 AN1280 ANTENNA GPS L1
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Symmetricom NTBW50AA 090-03845-02 Voltage Timing Module
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Symmetricom 58529A GPS Line Amplifier with L1 Bandpass
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Bancomm/Symmetricom PC03V VMEbus Time Code Processor
Bancomm/Symmetricom PC26V VME LED Display PCB
Symmetricom 090-45190-01 DCD-519 SHELF DIGITAL CLOCK