變頻器對(duì)于
電機(jī)的影響還是有的，普通電機(jī)設(shè)計(jì)都是按恒頻恒壓設(shè)計(jì)的。不會(huì)完全適應(yīng)變頻調(diào)速的要求，那么變頻器怎么影響三相異步電動(dòng)機(jī)呢？
1、電動(dòng)機(jī)對(duì)頻繁啟動(dòng)、制動(dòng)的適應(yīng)力
采用變頻器供電后，電動(dòng)機(jī)可以在很低的頻率和電壓下以無沖擊電流的方式啟動(dòng)，并可利用變頻器所供的各種制動(dòng)方式進(jìn)行快速制動(dòng)，為實(shí)現(xiàn)頻繁啟動(dòng)和制動(dòng)創(chuàng)造了條件。因此，電動(dòng)機(jī)的機(jī)械系統(tǒng)和電磁系統(tǒng)處于循環(huán)交變力的作用下，給機(jī)械結(jié)構(gòu)和絕緣結(jié)構(gòu)帶來疲勞和加速老化問題。
2、低轉(zhuǎn)速時(shí)的冷卻
異步電動(dòng)機(jī)的阻抗并不理想，當(dāng)電源頻率較底時(shí)，電源中高次諧波所引起的損耗較大。
普通異步電動(dòng)機(jī)再轉(zhuǎn)速降低時(shí)，冷卻風(fēng)量與轉(zhuǎn)速的三次方成比例減小，致使電動(dòng)機(jī)的低速冷卻狀況變壞，溫升急劇增加，難以實(shí)現(xiàn)恒轉(zhuǎn)矩輸出。
3、諧波電磁噪音與震動(dòng)
變頻電源中含有的各次時(shí)間諧波與電動(dòng)機(jī)電磁部分的固有空間諧波相互干涉，形成各種電磁激振力。異步電動(dòng)機(jī)采用變頻器供電時(shí)，會(huì)使由電磁、機(jī)械、通風(fēng)等因素所引起的震動(dòng)和噪聲變的更加復(fù)雜。
由于電動(dòng)機(jī)工作頻率范圍寬，轉(zhuǎn)速變化范圍大，各種電磁力波的頻率很難避開電動(dòng)機(jī)的各構(gòu)件的固有震動(dòng)頻率。當(dāng)電磁力波的頻率和電動(dòng)機(jī)機(jī)體的固有振動(dòng)頻率一致或接近時(shí)，將產(chǎn)生共振現(xiàn)象，從而加大噪聲。
.jpg)
(8536) Festo Pneumatic Cylinder DZH-16-100-PPV-?A-S20 10
(4856) GE Circuit Breaker TED124010 10A 480 VAC 2 POLE
(8364) Reliance Reactor 69089-29-A (8364)
(8389) Furnas 100A Overload Relay 48HB11A 1P 1NC NEMA1
(8390) Pneumax Solenoid Valve 878 3.52 (8390)
(6240) Allen Bradley Relay 24VDC 700DC-F400 + 196-FTA 1
(5698) Allen Bradley Push Button Flush Head Green 800T-
(8629) Graco Seat Piston 189441
(N2-2) 2 MICRO SWITCH LSZ3A LIMIT SWITCHES N2-2
(Q5-4) 1 SQUARE D 8430-MPS PHASE RELAY Q5-4
(Q2-2) 1 TELEMECANIQUE V3 SWITCH BODY Q2-2
(K3) 1 WESTINGHOUSE FDB3015L CIRCUIT BREAKER 15A (K3)
(7183) Siemens Molded Case Circuit Breaker A01JLD64 800
(Q2-3) 1 ASCO L8262G202E VALVE KIT Q2-3
(4194) Giant Lot of 1125 Sprecher + Schuh Tag Strips Le
(L9) 1 CINCINNATI MILACRON 3-531-2139-A CIRCUIT BOARD L
(H2-2) 1 HUBBELL 67542-001 PUSHBUTTON STATION H2-2 "
(4759) Square D Dual RH Adder Pole Kit 8903-L3R NIB (4
(G1-5) 2 OMRON H3CA-A SOLID STATE TIMER. G1-5.
(N1-2) 1 AEG E-NR910-302-545?-22 CONTACTOR N1-2
(7268) GE Circuit Breaker TED136015 15A 600 VAC 3P (726
(6096) Banner Photoelectric Scanner Minibeam 26911 (60
(6457) Siemens 20 Amp Circuit Breaker QF120 20 Amp 1 Po
(N1-3) 1 WESTINGHOUSE FB3060L CIRCUIT BREAKER N1-3
(Q7-2) 6 NIB MICROSWITCH BZ-2RW826-A2 SWITCH ROLLER LEV
(6750) Cutler Hammer Indicating Light 10250T181HLP 120V
(6751) Cutler Hammer Indicating Light 10250T181HGP 120V
Cutler Hammer Indicating Light 10250T181HRP 120V Red (6
(O4-4) 1 BANNER MB5-14 MODULE O4-4
(7350) Allen Bradley 190E-MND2-CA440?X Starter .25-.4A 1
(O4-5) 1 ALLEN BRADLEY 800MR-D9 PUSHBUTTON O4-5
(5140) Lot of 7 Allen Bradley Contact Blocks 895-BO 800
(5953) Asco Valve DX80304513813 1/2" 15.4 Watts 15 Psi
(O1-13) 1 GENERAL ELECTRIC TEF136015 CIRCUIT BREAKER O1
(Q8-1) 1 GE FANUC IC693MDL930E OUTPUT MODULE RELAY Q8-1
(5164) ABB Push to test Pilot White CBG-MFLP-TL8W (51
(8586) TB Woods Synch Sprocket P448M20SDS 44Grv 7/8" B
(H3) 1 CUTLER-HAMMER PROXIMITY SWITCH E51-DT6 h3
(L27-4) 1 MICRO SWITCH AS445C1 MERCURY SWITCH WITH
(Q4-3) 1 FUJI EG33C CIRCUIT BREAKER Q4-3
(L5) 1 SYLVANIA KPM10 SERVICE KIT L5
(D2) 2 BANNER SM2A31R MINI BEAM SCANNERS (D2)
(A9) 1 NIB HUBBELL WPFA20BK EXHAUST GRILLE & FILTER A9
(A9) 1 NIB PIAB 3222188/1 VACUUM PUMP CHIP A9
(T2-2) 1 OMAL J9CPN1644 VALVE. T2-2.
(X5-22) 1 NIB FURNAS 48DC31AA3 OVERLOAD RELAY X5-22
(B1) 1 SIEMENS 6ES5 430-8MD11 INPUT MODULE B1
(Q1-6) 1 KEYENCE FS-M1P AMPLIFIER Q1-6
(Q5-3) 1 ALLEN BRADLEY 800H-QRAH24G PUSH BUTTON Q5-
(Q5-3) 1 ALLEN BRADLEY 800H-QRAH24W PUSH BUTTON Q5-
(4420) Lot of 4 Polybus IDC Cable Adapters C1A95R (44
(Q1-6) 1 LOCHINVAR PLT2905 PILOT INT IGNITION Q1-6
(Q1-6) 1 NUMATICS F10D02C FILTER Q1-6
(N2-3) 1 REGENT CONTROLS TM2200 TIMER N2-3
(N2-3) 1 PARKER K17803549 VALVE N2-3
Lot 10 Lumberg Cordset Mini Receptacle RSF50-677 4140 C
(4068) Allen Bradley AC Relay 700-P600A1 600 VAC 6P (
(4071)C Allen Bradley Limit Switch 802T-BP 60 A 120/600
.jpg)
在線客服