1794-NM1

三相異步電動機要實現調速有多種方法，如采用變頻調速（YVP變頻調速電機配合變頻器使用），改變勵磁電流調速（使用YCT電磁調速電機配合控制器使用，可實現無極調速），也可通過改變電動機變極調速，即是通過改變定子繞組的連接方法達到改變定子旋轉磁場磁極對數，從而改變電動機的轉速。

根據公式；n1=60f/p可知異步電動機的同步轉速與磁極對數成反比，磁極對數增加一倍，同步轉速n1下降至原轉速的一半，電動機額定轉速n也將下降近似一半，所以改變磁極對數可以達到改變電動機轉速的目的（這也是常見的2極電機同步轉速為3000rpm，4極電機同步轉速1500rpm，6極電機同步轉速1000rpm等）。這種調速方法是有級的，不能平滑調速，而且只適用于鼠籠式電動機，這就是雙速電機的調速原理。

INDRAMAT RECO G.06/01-FW (8 SLOT I/O RACK) GOOD TAKEOUT

NEW INDUSTRIAL SCIENTIFIC ITRANS TOXIC SENSOR 7702-5286

FANUC A06B-0313-B672 #7008 SERVO MOTOR GOOD TAKEOUT

WESTINGHOUSE MC3800 CIRCUIT BREAKER (RECONDITIONED)

INDRAMAT NFD02.2-480-055 POWER LINE FILTER NEW IN BOX

SIEMENS 6FX1132-8BB01 CPU MODULE (XLNT CONDITION)

ITE GOULD TYPE ET KM 800 FRAME (400 AMP) TRIP 600V NOS

YASKAWA CACR-SR02AA2AH SERVOPACK (REFURBISHED)

ALLEN BRADLEY 1771-NIVR A HIGH RESOLUTION ANALOG

EDWARDS UNIVALVE D96128F22 SIZE 1/2 CLASS 4500 NOS

EMCO INLINE VORTEX FLOWMETER PHD90L30F150L0CT0T (NEW)

CUTLER HAMMER D730/T/S-FN-SH OPERATOR PANEL GOOD TAKEOU

ALLEN BRADLEY 2705-K12C2 SER. F REDI PANEL *XLNT*

LOMA SUPERSCAN METAL DETECTOR CONTROL BOX MD21-6926 

ALLEN BRADLEY 8600 5441 OSAI OS5441 XLNT CONDITION

FALK 4115J25C SHAFT MOUNT SPEED REDUCER 13.95 RATIO NEW

MTS AUTOMATION MPA-10 205L (1 PHASE) GOOD TAKEOUT

SIEMENS SINUMERIK 6FC 3741-0FB-Z CONTROL RACK (XLNT)

KUNKLE SAFETY RELIEF VALVE SIZE 4X6 TYPE 600P REPAIRED

SIEMENS 6ES5340-3KB41 SIMATIC MEMORY MODULE 

LEAR SEIGLER MEASUREMENT CONTROL CORP. DYNATRON 2100

OKUMA E4809-045-091-E OPUS 5000 II MAIN BOARD XLNT

ALLEN BRADLEY 1785-L60B/E ENHANCED PLC-5 CONTROLLER V01

SIEMENS 6ES5470-4UA12 ANALOG GOOD TAKEOUT

SUNDSTRAND 18 SERIES - 7004 NEW OLD STOCK

ULTRA OVAL LUS56C11-A400 GEARED FLOW METER (50 MM) SST

BARBER-COLMAN 80SA-30001-001-V-00 FACTORY RECONDITION

PACIFIC SCIENTIFIC SC103-001-T3 VELOCITY CONTROLLER 

ROSEMOUNT ANALYTICAL 1054AT TOROIDAL CONDUCTIVITY (NEW)

OKUMA SDU-600.W DC SPINDLE DRIVE (MODEL 4) 200/220V

YASKAWA SERVOPACK DR1B-01AC GOOD TAKEOUT

SUNDSTRAND SERIES 18-7004 NEW OLD STOCK

ITE/Siemens ET KM3B800 KM Frame Circuit Breaker *XLNT*

FANUC A16B-1500-0010 /03B MASTER PCB *XLNT CONDITION*

FANUC A16B-1500-0021 0/2B PCB, PS & I/O XLNT CONDITION

SIEMENS 6FX1121-4BA01 SERVO INTERFACE MODULE (XLNT)

GIDDINGS & LEWIS 810-21977-01 CONTROL MODULE W/POWER..

ROTORK PROCESS CONTROL ACTUATOR LA-2510-N-4-9/1600-12C

YASKAWA CACR-SR15SZ1SDY77 SERVOPACK *XLNT* CONDITION

BOSCH LT303 SERVO AMPLIFIER 0608750084 GOOD TAKEOUT!

RELIANCE VS DRIVE GP-2000 (2GU41005) 6.5 KVA , 5 HP

GIDDINGS & LEWIS 502-03846-00R4 (PIC900) PROCESSOR

FANUC A06B-0501-B204 SERVO MOTOR NEW OLD STOCK

AVTRON TRIMMER PROGRAMMER D14660 NEW OLD STOCK *LNC*

ABB ACH501-005-4-00P2 FREQUENCY AC DRIVE (5 HP)

ABB (ASEA DSPC 153) 2668 180-113/5 GOOD TAKEOUT

MITSUBISHI MELSEC AX80Y80C INPUT/OUTPUT UNIT 

ALLEN BRADLEY 209-DSD-010X-DN (ULTRA 3000I DRIVE) 

SIEMENS CFD63B100 CIRCUIT BREAKER GOOD TAKEOUT

MAYATECH CORPORATION 464290 BRAND NEW NOT IN BOX

MAYATECH CORPORATION 811077 EDGE OF WEB SENSOR NEW

MOORE APACS 39ACM24BAN (ACM MODULE) GOOD TAKEOUT

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FANUC A16B-1100-0280/05A SERVO AMPLIFIER BOARD (REMAN)

ALLEN BRADLEY 1336F-BRF100-AA-EN-HAS2-LA7-L4 

ALLEN BRADLEY 1326AB-B2E-11 SERVO MOTOR (REFURBISHED)

ABB ACS350-03U-09A8-2 DRIVE (3 HP) BRAND NEW!

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LANDMARK GRAPHIC INTERFACE PANEL LMG (115 VOLT)

SPEED SELECTOR 518-100-60 (BRAND NEW) SPEC # TB

OMRON C200H-NC211 (NC UNIT) NEW OLD STOCK

NIKKI DENSO ACTUS POWER NPSA-20NN-50E8 SERVO CONTROL

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HONEYWELL TRANSCEIVER 30752766-001 (XLNT COND)

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MITSUBISHI ENCODER RFH1024-22-1M-68 TYPE TSI508 N85 NEW

ABB AXEM DC MOTOR F9M4 57540 GOOD USED TAKEOFF!