在提高工藝水平和產(chǎn)品質(zhì)量方面的應用
變頻器還可以廣泛應用于傳送、起重、擠壓和機床等各種機械設(shè)備控制領(lǐng)域，它可以提高工藝水平和產(chǎn)品質(zhì)量，減少設(shè)備的沖擊和噪聲，延長設(shè)備的使用壽命。采用變頻調(diào)速控制后，使機械系統(tǒng)簡化，操作和控制更加方便，有的甚至可以改變原有的工藝規(guī)范，從而提高了整個設(shè)備的功能。例如，紡織和許多行業(yè)用的定型機，機內(nèi)溫度是靠改變送入熱風的多少來調(diào)節(jié)的。輸送熱風通常用的是循環(huán)風機，由于風機速度不變，送入熱風的多少只有用風門來調(diào)節(jié)。如果風門調(diào)節(jié)失靈或調(diào)節(jié)不當就會造成定型機失控，從而影響成品質(zhì)量。循環(huán)風機高速啟動，傳動帶與軸承之間磨損非常厲害，使傳動帶變成了一種易耗品。在采用變頻調(diào)速后，溫度調(diào)節(jié)可以通過變頻器自動調(diào)節(jié)風機的速度來實現(xiàn)，解決了產(chǎn)品質(zhì)量問題。此外，變頻器能夠很方便地實現(xiàn)風機在低頻低速下啟動并減少了傳動帶與軸承之間的磨損，還可以延長設(shè)備的使用壽命，同時可以節(jié)能40%。
電壓空間矢量(SVPWM)控制方式
它是以三相波形整體生成效果為前提，以逼近電機氣隙的理想圓形旋轉(zhuǎn)磁場軌跡為目的，一次生成三相調(diào)制波形，以內(nèi)切多邊形逼近圓的方式進行控制的。經(jīng)實踐使用后又有所改進，即引入頻率補償，能消除速度控制的誤差；通過反饋估算磁鏈幅值，消除低速時定子電阻的影響；將輸出電壓、電流閉環(huán)，以提高動態(tài)的精度和穩(wěn)定度。但控制電路環(huán)節(jié)較多，且沒有引入轉(zhuǎn)矩的調(diào)節(jié)，所以系統(tǒng)性能沒有得到根本改善。
1" Sanitary Alfa Laval Actuated Valve with ThinkTop E7
ALFA LAVAL AH11-GC-E-1.5-?T316-HNDL NSPP AH11GCE15T316H?ND
Alfa Laval Valve Basic Top Type SRC 1 3/8" dia (3414)
Alfa Laval Valve Basic Top Type SRC 1 3/8" dia (3415)
Alfa Laval Valve Basic Top Type SRC 1 3/8" dia (3416)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3410)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3411)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3412)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3409)
Alfa Laval SattCon OP45 SCOP45/DX485G, Used, SCOP45DX485G, Fast Shipping
Alfa Laval SattCon OP45, Used, OP45SATTCON, Fast Shipping
Alfa Laval SattCon OP45 SCOP45/DX232, Used, SCOP45DX232, Fast Shipping
Alfa Laval Valve *New* SRC-W-3A-3-7-2?0-J
40504 New In box, Alfa Laval 9630856472 Replacement Kit-Seal
Alfa Laval SattCon RAM30T 940-120-211, New, RAM30T, Fast Shipping
Alfa Laval SattCon CU05-25/SD32D Slimline, Used, CU0525SD32DSLI?MLINE, Fast
Alfa Laval SattCon SC05-20B, Used, SC0520B, Fast Shipping
Alfa Laval XACV-B/24, Used, XACVB24, Fast Shipping
Alfa Laval Valve Basic Top Type SRC (3413)
Alfa Laval Saunders Multiport Diverter Valve w/ 5 ports
Alfa Laval SattCon CU32, Used, CU32SATTCON, Fast Shipping
Alfa Laval SattCon CU33, Used, CU33SATTCON, Fast Shipping
Alfa Laval SattCon CU35, Used, CU35SATTCON, Fast Shipping
Alfa Laval SattCon ROM30 512K, New, ROM30Sattcon, Fast Shipping
Alfa-Laval: NB 26-24 (B21, B21) Heat Exchanger. No: 5180391 W
ALFA LAVAL GHK11 G&H (3 WAY SANITARY VALVE) 3" SST NEW
Alfa Laval SattCon SD24D Slimline, Used, SD24DSLIMLINE, Fast Shipping
Alfa Laval SattCon SC05-10B 976-001-003, Used, SC0510B, Fast Shipping
ALFA-LAVAL SMU 2A SPEED MONITORING UNIT 551-131-20
ALFA LAVAL ECA50 C ECA50-0100 SATT PROCESS CONTROLLER DIGITAL ABB 498047 40760
Alfa-Laval 1-Way A3 Plug Valve w/Tri-Clamp Ends SS
Alfa Laval SattCon IDPN, New, IDPNSATTCON, Fast Shipping
ALFA LAVAL TT50-31 USPP TT5031
Alfa Laval SattCon SD32D, Used, SD32DSATTCON, Fast Shipping
ALFA LAVAL DE LAVAL ENAMEL PORCELAIN SIGN
Enlarge
Alfa Laval SattCon ODP.8, Used, ODP8SATTCON, Fast Shipping
Alfa Laval SattCon ODPLD, Used, ODPLDSATTCON, Fast Shipping
Alfa Laval MBOX2072, Used, MBOX2072, Fast Shipping
Alfa laval Salinometer DS20 Type DS 20 Rev. 2
ALFA-LAVAL LKB53A-6700-4A?-E-S
ALFA LAVAL LKLA-TNC NSFP LKLATNC
ALFA LAVAL THINK TOP 9612578901 *NEW IN BOX*
Alfa Laval - Heatpac Control Mod. 31830
Enlarge
Alfa Laval Sauders SS Valve System w/ M0A-N0M12-00 EC Piston Actuator 8 Bar max.
40508 New-No Box, Alfa Laval 9630048053 Pump Rotor 3L SS 10/130
39785 Old-Stock, Alfa Laval Seperation Inc 74693-00 Konsol Bracket, 3/8" Thread
ALFA LAVAL 550557-80 USPP 55055780
Alfa Laval SattCon DX485G, Used, DX485GSATTCON, Fast Shipping
2" ALFA-LAVAL KOLTEK 3AH 52-52 STAINLESS STEEL VALVE
*** FOOD GRADE ***
G&H Sanitary Remote Controlled Valve Alfa Laval Flow Tpye SRC 3"
ALFA LAVAL 700-P-012-K USPP 700P012K
ALFA LAVAL LKLANO NSPP LKLANO
ALFA LAVAL TS-150-B-01 USPP TS150B01
Alfa Laval Saunders 3" ID shutoff Valve late model great condition.
ALFA-LAVAL CBH25-50H (F1, F1) BRAZED PLATE HEAT EXCHANGER ~NEW~
25100 NEW ALFA LAVAL 9612129609 Pump Repair Kit 35mm K
ALFA LAVAL SRC-10 USPP SRC10
38495 New-No Box, Alfa Laval 9611416306 Actuator, 4"
ALFA LAVAL A-080M8200 K100200 ACTUATOR ECX D/A FOR VALVE 3 EPDM SAUND
ALFA LAVAL 9612129609 NSFP 9612129609
ALFA LAVAL 9612-6494-01 USPP 9612649401
ALFA LAVAL KMH5100-9626 USPP KMH51009626
ALFA LAVAL B7MP-3-304 NSPP B7MP3304
32864 New-No Box, Alfa Laval 9880-00 Bearing Sleeve 3-3/8" ID, 5" OD
ALFA LAVAL 70-212-00 NSFP 7021200
ALFA LAVAL 74565-00 NSFP 7456500
ALFA LAVAL 2CMP-3-316 NSPP 2CMP3316
Alfa Laval DXD DUB-SL, Used, DXDDUBSL, Fast Shipping
10195 NEW Alfa Laval 3149205511 Seal Set
ALFA LAVAL 32263-0814-6 NSPP 3226308146
ALFA LAVAL 32263-0914-4 NSPP 3226309144
ALFA LAVAL 32263-0914-6 NSPP 3226309146
ALFA LAVAL 32263-1804-6 NSPP 3226318046
ALFA LAVAL 17-109-U25 NSPP 17109U25
ALFA LAVAL 32330.1419.3 NSPP 3233014193
ALFA LAVAL 481295 NSPP 481295
ALFA LAVAL 9611926737 NSFP 9611926737
ALFA LAVAL 06-532072-01 NSPP 0653207201
ALFA LAVAL 9611-92-4055 NSFP 9611924055
ALFA LAVAL 9611-92-4055 NSPP 9611924055
ALFA LAVAL 9611-92-4055 USPP 9611924055
ALFA LAVAL 9611-92-4058 NSFP 9611924058
ALFA LAVAL 9611-92-4058 NSPP 9611924058
ALFA LAVAL GHK11-GC-POL-2 NSPP GHK11GCPOL2
ALFA LAVAL GHK76MH5000V NSFP GHK76MH5000V
ALFA LAVAL MB-00004 NSPP MB00004
ALFA LAVAL PC14081-2 NSFP PC140812
Alfa Laval/Saunders Butterfly Valve MXMP112TC 20"
Alfa Laval / Saunders Butterfly Valve / Gear MYNB 112TC
Alfa Laval GHPD 332RF Pump
Brand New Alfa Laval Tri Clover A3 Sanitary Pump
ALFA LAVAL GHPD-322 POSITIVE DISPLACEMENT ROTARY PUMP
ALFA LAVAL LKH-70/230 40hp CENTRIFUGAL PUMP
Used- Alfa Laval Thermal Plate Exchanger, 59.25 Square
Alfa Laval Plate Heather Exchanger Model M6-FD
11109-008 Alfa Laval model 10BFG plate style heat exchanger
ALFA LAVAL LKH-45/165 CENTRIFUGAL PUMP
Alfa Laval / Saunders Butterfly Valve 4"
ALFA LAVAL,3", 1X2 PLUG VALVE
Alfa Laval actuated Valve 7715-10m-14p-2?x15-e-316l-pl
ALFA LAVAL,3", 1X1 PLUG VALVE
Alfa Laval Air Actuator
Alfa Laval Rotary Pump
ALFA LAVAL SERVO DRIVE 31830-3350-1
ALFA LAVAL,2" 1X1 PLUG VALVE,STAINLES?S STEEL
Alfa Laval Think Top Replacement Control Top
45BY-3-02-SFY SPRINGER PARTS FOR ALFA LAVAL VALVES - BALL - OEM P/N 620377
ALFA LAVAL CPM-D-60-GC-?3 POL CONSTANT PRESSURE MODULATING INLET VALVE-NEW
882303760 CPM-I-D60 WITH MANUAL AND CONFORMITY CERT!!!
Enlarge
ALFA LAVAL FLOW SWITCH NSN 5930-01-448-26?32 NEW
ALFA LAVAL A3 PLUG VALVE 4"
TRI-CLOVER ALFA LAVAL BUTTERYFLY 3 WAY SHUTTER VALVES AIR OPERATED ETC
ALFA LAVAL SERVO DRIVE SS5
Alfa Laval Saunders DN 50 Valve
41212 Old-Stock, Alfa Laval Seperation 98 01 B Liner, 7-11/16" ID, 21-9/16" OD
SS ALFA LAVAL 1-WAY A3 PLUG VALVE 2"
45BY-3-02-SFY SPRINGER - BALL - ALFA LAVAL P/N 620377 VALVE REPLACEMENT BALL
Alfa Laval Refrigerant Heat Exchanger Type CB14-14H
ALFA LAVAL FILTERING DISK, FLUID PART # 1800-03365 NSN: 4330-14-479-43?89
ALFA LAVAL,PN10,1X1 2" PNUEMATIC VALVE,STAINLES?S STEEL
Alfa Laval Refrigerant Heat Exchanger, Model: CB76 - 40H S54
Alfa Laval Saunders Diaphragm Valve DN50 1.75" 34598 SS
Alfa Laval Saunders DN 25 Valve
2 Inch Tri Clamp Diaphram Valve Alfa Laval Saunders Stainless Steel USDA/A3/3A
ALFA LAVAL,SRC-W-3A?-2.5-9-20H W/HD SPRING,PLUG VALVE
45BY-21/2-02-S?FY SPRINGER - BALL - ALFA LAVAL P/N 620262 VALVE REPLACEMENT BALL
1.5 Inch Tri Clamp Diaphram Valve Alfa Laval Crane Saunders Stainless Steel 316L
1.5 In Valve Tri Clamp Alfa Laval Saunders Diaphram Stainless Steel 316L
ALFA LAVAL,SRC-W-3A?-2.5-7-20H W/HD SPRING, VALVE
Alfa-Laval model NB26-34H brazed plate heat exchanger
Enlarge
Alfa Laval Saunders EC Piston Actuator
ALFA LAVAL SAUNDERS EC PISTON ACTUATOR
45BY-21/2-02-S?FY SPRINGER - BALL - ALFA LAVAL P/N 620262 VALVE REPLACEMENT BALL
ALFA LAVAL LKLA PNEUMATIC VALVE WITH 2 1/2" BUTTERFLY
ALFA LAVAL,3"X 3"- 4" STAINLESS STEEL PNUEMATIC VALVE
Alfa Laval Heat Exchanger
Alfa Laval 10939820 Refrigerant Heat Exchanger
Caterpillar/Al?faLaval Plate Heat Exchanger Plate As-New
Caterpillar/Al?faLaval Plate Heat Exchanger Plate As-New
TRI-CLOVER AIR OP VALVE SANITARY ALFA LAVAL
New Alfa Laval A10b Heat Exchanger Channel Plate 304 SS
Saunders - Via Alfa Laval air actuator
Alfa Laval Tri Clover TSK5 Lip Seal Housing #2
Alfa Laval Tri Clover TSK3 Lip Seal Housing
Alfa Laval Tri Clover TSK5 Lip Seal Housing
Alfa Laval Saunders Module Remote Indicator
Alfa Laval Saunders EC Piston Actuator 8 bar Max Spring to Close 1/8" NPT (NEW)
Alfa Laval Tri Clover DuraMetallic Mechanical Seal Kit
Alfa laval 3/4 Hook Bolt for spiral heat transfer 737346181
NOS! ALFA LAVAL TEMPRESS RATE OF FLOW INDICATOR 543269-01 6680012775972
ALFA LAVAL SLEEVE PART # AB281-1 NSN: 4330-00-339-32?14
2x Alfa Laval Tri Clover Rotary Assembly 55mm Pump Part
For the TSR 5 Pumps, 160-70 / R7400-135
Alfa Laval Oil Pressure Switch M52363 1000psi
Custom Control Sensors Inc. P/N 610G2008 for Alfa Laval
NOS! ALFA-LAVAL PUMP SEAL KIT 31490-0551-5 GHP-601
NOS! ALFA LAVAL SHUT OFF VALVE P/N 535199-02 53519902
Alfa Laval Tri Clover Rotary Assembly 55mm Pump Part
Van Air Systems Regenerative Dryer Model: HB-900 with Ametek Blower
AMETEK AMETEK 241CEII-1A USPP 241CEII1A
Ametek RK-200 dead weight tester, certified
Ametek RK-200 dead weight tester, NIST-certified
AMETEK PA40894024589 *CALBRTD*
Ametek MK-100 dead weight tester, NIST-certified
Ametek Gemco 1991A116R12TX Quik-Set IV High Speed PLS
Ametek Gemco 1989A16R12SEKX Limit Switch NEW-NO BOX
AMETEK PKII PK2-MED-1B SELF-REGULATIN?G PNEUMATIC DEAD WEIGHT TESTER PK2 mm Hg
XANTREX SORENSEN AMETEK XDC100-60 XDC 100-60 100V 60A DC POWER SUPPLY GPIB
AMETEK PKII PK2-MED SELF-REGULATIN?G PNEUMATIC DEAD WEIGHT TESTER PK2 mm Hg
AMETEK RK 1100WC PNEUMATIC DEADWEIGHT PRESSURE TESTER NIST TRACEABLE EXCELLENT
Sorensen / Power Ten # P63C-28360J Variable DC Power Supply, Ametek 600W to 30kW
1 AMETEK 1995-L-6M-X MICRO-SET (E6)
Ametek PKII(2) Pneumatic Dead Weight Tester PK-II-30-SS
AMETEK 4000 PHOTOMETRIC ANALYZER
JOFRA AMETEK 650SE 122-1202degF 50-650degC Temperature Calibrator
AMETEK Dycor RGA, P/S HQ100F, M100F and Probe Head
AMETEK PA4089504241 *CALBRTD*
AMETEK PA40892724237 *CALBRTD*
AMETEK PA40894024503 *CALBRTD*
Dycor Ametek CG1000RTP Oxygen Analyzer , Applied Materials
Applied Materials, Ametek CG1101 Oxygen Analyzer
AMETEK ZF2-480-60-UB-?01 USPP ZF248060UB01
LOT OF 4 AMETEK/Applied Materials 15-100387-01N REV A
AMETEK ZF248060NC01 USPP ZF248060NC01
NIB AMETEK 1995-A-6M-X-X PROGRAMMABLE LIMIT SWITCH 6OUTPUT RELAY 10AMP 1995A6MXX
AMETEK 11KB36013300 USPP 11KB36013300
AMETEK 11KF7305-AGBL USPP 11KF7305AGBL
GEMCO AMETEK 1995-B-6M-P-X 1995-B6MP 1995B PLS/BRAKE MONITOR MICRO SET QUANTITY
AMETEK HLG-12 DEADWEIGHT TESTER 25-1000 PSI (CERTIFIED)
Ametek PK-30 dead weight tester, NIST-cal'd, guaranteed
在線咨詢 
