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三相笼型异步电动机降压起动的方法有：定子绕组串电阻（电抗）起动； -Y —△降压起动 ；延边三角形降压起动；自耦变压器降压起动。降压起动的实质是，起动时减小加在电动机定子绕组上的电压，以减小起动电流；而起动后再将电压恢复到额定值，电动机进入正常工作状态。

（ a ）为电动机定子绕组串电阻降压自动起动控制线路。

　电路的工作原理为：合上电源开关 QS ，按下起动按钮 SB1 ， KM1 得电并自锁，电动机定子绕组串入电阻 R 降压起动，同时 KT 得电，经延时后 KT 常开触头闭合， KM2 得电主触头将起动电阻 R 短接，电动机进入全压正常运行。

　　２．手动自动混合控制线路

二、自耦变压器降压起动控制线路

　　自耦变压器降压起动是指电动机起动时利用自耦变压器来降低加在电动机定子绕组上的起动电压。待电动机起动后，再将自耦变压器脱离，使电动机在全压下正常运行。

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