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三相籠型異步電動機降壓起動的方法有：定子繞組串電阻（電抗）起動； -Y —△降壓起動 ；延邊三角形降壓起動；自耦變壓器降壓起動。降壓起動的實質是，起動時減小加在電動機定子繞組上的電壓，以減小起動電流；而起動後再將電壓恢復到額定值，電動機進入正常工作狀態。
（ a ）為電動機定子繞組串電阻降壓自動起動控制線路。
電路的工作原理為：合上電源開關 QS ，按下起動按鈕 SB1 ， KM1 得電並自鎖，電動機定子繞組串入電阻 R 降壓起動，同時 KT 得電，經延時後 KT 常開觸頭閉合， KM2 得電主觸頭將起動電阻 R 短接，電動機進入全壓正常運行。
２．手動自動混合控制線路
二、自耦變壓器降壓起動控制線路
自耦變壓器降壓起動是指電動機起動時利用自耦變壓器來降低加在電動機定子繞組上的起動電壓。待電動機起動後，再將自耦變壓器脫離，使電動機在全壓下正常運行。
ACE INVERTER KST SERIES ACE-KST-460V-3P-1HP
ABB FISHER & PORTER CIRCUIT BOARD CARD 686B384-U05
ABB FISHER & PORTER CIRCUIT BOARD CARD 686B384U06
ABB FISHER & PORTER CIRCUIT BOARD CARD 686B384U07
ZM TECHNOLOGIES CARTRIDGE SEAL ANSI1370-01SK00-25V 1 3/8" ANSI1370
SIEMENS WALDRICH COBURG CIRCUIT BOARD 5.35200.00.020.0A 535200000200A
THOMSON MICRON TRUE PLANETARY GEARHEAD NT42-005-P00-P 34-613-153-5765
Siemens 3 Meter Module MM34U.A 1200a
Gemco Ametek Cam Rotating 6 Cam 19801206SPX
Honeywell Flame Detector 012C1042 120V 0.5WATTS
EATON IDT CIRCUIT BOARD CARD 40-11130-01 42-R11150-02
DYNAMATIC TRANSISTOR INVERTER CARD 70-205-2 15-564-106 1556410
SIEMENS HTP GENERATOR/MOTOR PCB P0008663C P0008664 SCH D0003129
General Electric GE Fanuc 24/48v 16PT IC660EBD021L IC660TBD023K
SIEMENS CPS HTP GENERATOR/MOTOR P0006945B P0006946 SCH D0001606
General Electric GE Fanuc IC660ELD021B 24/48vdc IC660TBD023K
RELIANCE ELECTRIC NETWORK COMMUNICATIONS 57404-1G
RELIANCE ELECTRIC 57412-2A
ABB Freelance 2000 Link Module P 37421-4-0369-652 P37421-4-0369-652 F6.11.9
FISHER Signal Converter Module KM1546 43A6829X0A2 E
ABB ASEA CIRCUIT BOARD CARD YYT102C YT212001-AK/5 2668 180-89/3
Kollmorgen Industrial Drive BDS4P 220v BD4SP-203H-9205/204A7 BD4SP-203H
Yokogawa DPharp Transmitter EJA430A Style S1 FAS1B-92DA/FF1/D1
NUMATICS VALVE 33DSA4410013T
Reliance Electric 0-54349-2G 54349-2G
HONEYWELL TEMPERATURE CONTROLLER UDC2300 MINI-PRO DC230B-E0-00-10-0000000-00-0
GENERAL ELECTRIC GE DC COIL 22D14G4
Ametek Patriot Gemco 925-1408 9251408
ABB YPO 103A YPO 103 YT204001-AC/1
SULLIVAN PALATEK COALESCING FILTER AUTO DRAIN AND DPG SPT-062GA-U 1-1/2" NPT
Allen Bradley AB ControlLogix DC Output 1756-OB8EI/A
NEWE SA POWERWARE EXIDE CIRCUIT BOARD NW4006E3 NW4006F
ABB ELEC. TRANSMITTER 503TB01261A0120-1000-804216 503TB01261A0120
DRAGER POLYTRON PYROLYZER 8314330 ARUF-0020
WESTINGHOUSE CIRCUIT BOARD CARD 5879C89G0 5879C89G01 Rev 10 1D77498H01
YOKOGAWA SC402G-E-1-E 110-120VAC 50/60Hz EXA SC402
WITTENSTEIN S-10001100-F LPK 050-M03-50-111 DMF 15/10
BERGER SERVO MOTOR VRDM3910/50LWC
I-Bus N88 PC/XT Bus 8088 Board MONI-CARD--700-AP-N88
GENERAL ELECTRIC GE CIRCUIT BOARD IC600CB516A
POWERWARE EXIDE BYPASS POWER MODULE 118400142 101073556.001 110720338
RELIANCE ELECTRIC SP500 DRIVE 1SU24001 1hp 200-230VAC 6.4A 3PH 50/60Hz
Reliance Common Memory Module 64K 57413-3D 57C413B
Schrader Bellows PAG122301 30.500
HITACHI BW001-A4 N-A/4 M 68E2.121953
HALMAR ROBICON 560238.03 560238-03 8628
Reliance FlexPak Plus VS Drive 14C102
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