LS704SCALE336978C6NIB

同步型交流伺服电机

同步型交流伺服电机虽较感应电动机复杂，但比直流电机简单。它的定子与感应电机一样，都在定子上装有对称三相绕组。而转子却不同，按不同的转子结构又分电磁式及非电磁式两大类。非电磁式又分为磁滞式、永磁式和反应式多种。其中磁滞式和反应式同步电机存在效率低、功率因数较差、制造容量不大等缺点。

  数控机床中多用永磁式同步电机。与电磁式相比，永磁式优点是结构简单、运行可靠、效率较高；缺点是体积大、启动特性欠佳。但永磁式同步电机采用高剩磁感应，高矫顽力的稀土类磁铁后，可比直流电机外形尺寸约小1/2，质量减轻60﹪，转子惯量减到直流电机的1/5。它与异步电机相比，由于采用了永磁铁励磁，了励磁损耗及有关的杂散损耗，所以效率高。又因为没有电磁式同步电机所需的集电环和电刷等，其机械可靠性与感应（异步）电机相同，而功率因数却大大高于异步电机，从而使永磁同步电机的体积比异步电机小些。这是因为在低速时，感应（异步）电机由于功率因数低，输出同样的有功功率时，它的视在功率却要大得多，而电机主要尺寸是据视在功率而定的。

GE General Electric Safety Disconnect Switch TH3225 400

GE 100A 600V THFP363 / QMR363 w Hardware Fusible Panelb

Square D QMB Switch 1200 Amp QMB368W Fusible 600V E

GE General Electric SKDA36AN1200 1200 Amp Switch 1200A

Square D QMB Switch 400 Amp QMB325W Fusible 240V Series

Square D QMB Branch Switch Panelboard 600 Amp 277/480 V

Electroswitch S1-801-MRLSZB 800A/600VAC/60H?z Switch Ele

Westinghouse JD3250KYD04 250 Amp Switch 600V JD3250K JD

Cutler Hammer 30A Panelboard Switch EESWR360030SB2

Siemens ITE V7F3204 200 Amp 240V Vacu Break Panelboard

Federal Pacific QMQB-4022 400 Amp Panelboard Switch 240

Siemens ITE FCI 1600 Amp 240V Bolt loc Panel Series 6 3

Siemens/ITE V7H3605 400 Amp 600V Panelboard Vacu-break

Westinghouse 400A 600V FDPW365R Fusible Panelboard Swit

GE ADS36030HS 30A/600V Spectra Series Fused Panelboard

Square D QMB 600 Amp QMB366W 600 VAC Fusible Branch Swi

Boltswitch Bolted Pressure Contact Switch EJ 466-N 600

Federal Pacific QMQB4026 Panelboard Switch 400 A QMQB 4

Zinsco QSF-1033B Disconnect Switch 100 Amp QSF1033B 100

Cutler Hammer 600A 600V M50ASR365 Fusible Panelboard Sw

Square D H224AWK 200A Safety Switch 240V Fusible 200 Am

Square D Class 9007 Series A Limit Switch Type C54B2

Federal Pacific QMQB6622 60A Panelboard Switch 240V QMQ

GE General Electric HPC 4000 Amp THPC3640 B High Pressu

Federal Pacific QMQB8036VL 800A Panelboard Switch FPE 8

Westinghouse FDPS3260 600 Amp 240V Panelboard Switch FD

General Electric 763B406G28 600 Amp 600V Fusible Panelb

Zinsco QSFT333B 30A Disconnect Switch QSF-T333-B 30 Amp

PCI 4.16 kV/200A 3R/Outdoor/Rain?proof Switch/Disconne?ct

Zenith 225 Amp Transfer Switch 277/480 V 3PH ZTS22E-7AA

Cutler-Hammer DH364UDK 200 Amp

Square D LAL36000M 400A Molded Case Switch 600V LAL 400

Siemens/ITE VMS325T 400 Amp Panelboard Switch 240V VMS3

Westinghouse Panelboard Switch FDP-326R 600 Amp FDP326R

ITE Siemens HP3S160 1600 Amp Molded Case Switch Breaker

Russelectric Model 2000 Automatic Transfer Switch Contr

Square D QMB 600 Amp QMB366W 600V Fusible Branch Switch

GE ADS32600HM 600A 240V Spectra Series Fusible Panelboa

Westinghouse FDPT-6210 100 Amp FDP Twin Panelboard Swit

Square D H365DS 400A Fusible Safety Switch Stainless 3R

Sylvania QSFT-1033R 100A/240V QSF Unit QSFT1033R 3 Pole

Siemens/ITE 400A Switch Panelboard 240/120V Vacu-Break

Westinghouse Panelboard Switch FDP-226R 600 Amp FDP226R

Square D MHP36000MMT6297 Molded Case Switch 1000A 600V

Westinghouse FDPS3240 400 Amp 240V Panelboard Switch FD

Federal Pacific QMQB7032R Panelboard Switch 600 Amp QMQ

Square D QMB325MW 400A Main Switch Fusible 240 V QMB Pa

Square D QMB326MW 600A Main Switch Fusible QMB 240 VAC

Siemens/ITE VMS325T 400 Amp 240V Panelboard Switch VMS3

Westinghouse Panelboard Switch FDPS-267 800 Amp FDPS267

Square D MHL360006M 600A Molded Case Switch 600V Shunt

Zenith 225 Amp Transfer Switch 480 V 3PH ZTS22EC-5AAT

Federal Pacific QMQB7032 Panelboard Switch 600 Amp QMQB

General Electric ADS32600HM 600 Amp 240V Spectra Series

Federal Pacific QMQB-4036 R 400 Amp Disconnect Switch Q

LS704SCALE336978C6NIB