对于变频器，可能大多数人局限于变频空调了，都知道这种空调是在常规空调的结构上增加了一个变频器，从而达到省电的目的。其实，变频器除了能节能外，还有调速及过流、过压保护等功能。下面我们一起来了解下变频器的工作原理及接线图吧。
什么是变频器
变频器（VFD）是应用变频技术与微电子技术，通过改变电机工作电源频率方式来控制交流电动机的电力控制设备。变频器主要由整流（交流变直流）、滤波、逆变（直流变交流）、制动单元、驱动单元、检测单元微处理单元等组成。变频器靠内部IGBT的开断来调整输出电源的电压和频率，根据电进而达到节能、调速的目的，变频器还有很多的保护功能，如过流、过压、过载保护等等。
PCB加速度计 ; PCB加速度传感器 ；PCB振动传感器 ； PCB变送器：
301A10 301A11 301A12 317A61 320C02 320C03 320C04 320C11320C14
320C15 320C16 320C17 320C18 320C20 320C33 320C34 333B333B30
333B31 333B32 333B33 333B35 333B40 333B41 333B42 333B43333B45
333B50 333B51 333B52 333B53 333B55 337A30 337A31 338B34338B35
338C04 338B04 338C24 338B24 339A30 339A31 340A15 340A16340A50
340A65 340A66 340A75 3501A1220KG 350A13 350A14 350B03350B04
350B21 350B23 350B24 350B50 350B96 350A96 350C02 350B02350C31
351B03 350B31 351B04 351B11 351B14 351B31 351B32 351B41351B42
352A21 352A24 352A25 352A56 352A60 352A70 352A71 352A72352A73
352A78 352B352B01 352B10 352B30 352C03 352C04 352C15352C16
352C17 352C18 352C22 352C23 352C33 352C34 352C41 352C42352C43
352C44 352C65 352C66 352C67 352C68 353B01 353B02 353B03353B04
353B11 353B12 353B13 353B14 353B15 353B16 353B17 353B18353B31
353B32 353B33 353B34 353B43 353B44 353B51 353B52 353B77353M192
354B20 354B21 354B22 354B33 354C02 354C03 354C10 355A40355B02
355B03 355B04 355B12 355B33 355B34 356A01 356A02 356A12356A13
356A14 356A15 356A16 356A17 356A22 356A24 356A25 356A26356A30
356A31 356A32 356A33 356A34 356A35 356A36 356A61 356A63356A66
356A67 356A70 356A71 356A72 356B07 356A07 356B08 356B10356B11
356B18 356B20 356B21 356B41 356B40 357A05 357A07 357A08357A09
357A19 357B01 357B02 357B03 357B04 357B06 357A06 357B11357B12
357B14 357B21 357B22 357B33 357B34 357B40 357B45 357B53357B54
357B61 357B65 357B81 357B82 357B83 357B90 357C10 357C71357C72
357C73 3701D1FA3G 3701D1FB3G 3701G2FA3G 3701G2FB3G3701G3FA3G
3701G3FB3G 3703D1FD3G 3703D1FE3G 3703G2FD3G 3703G2FE3G3703G3FD3G
3703G3FE3G 3711A03 3711A05 3711D1FA200G 3711D1FA20G3711D1FA3G
3711D1FA50G 3711D1FB200G 3711D1FB20G 3711D1FB3G3711D1FB50G
3713D1FD200G 3713D1FD20G 3713D1FD3G 3713D1FD50G3713D1FE200G
3713D1FE20G 3713D1FE3G 3713D1FE50G 3741D4HB100G3741D4HB10G
3741D4HB200G 3741D4HB2G 3741D4HB30G 3741D4HB50G 393A03393B04
393B05 393B12 393B31 393B32 393C 3991A1020KG 3991F3JB203991A1120KG
3991A3020KG 3991M02 600A02 600A03 600A06 600A07 600A08600A09
600A12 600A13 600A14 601A01 601A02 601A11 601A12 601A21601A22
601A31 601A32 601A61 601A62 601A71 602D00 602D01 602C01602D10
602D11 602C10 602c11 602D61 602C61 603C00 603C01 603A01603C02
603C05 603C11 603C21 603C61 604B11 604B31 604B61 605B01605B02
605B11 605B61 606B01 606B11 606B21 606B31 606B61 607A01607A11
607A61 608A10 608A11 612A01 621B40 621B41 621B51 622A11622A01
622A21 622A31 622A61 622B01 622B11 622B61 623C00 623C01623C10
623C11 623C20 623C21 623C30 623C31 623C60 624A01 624A11624A21
624A31 624A61 624B01 624B11 624B21 624B61 625B00 625B01625B02
625B10 625B11 625B12 625B13 625B20 625B21 625B22 625B30625B31
625B32 625B60 625B61 625B62 626A04 626A34 626B01 626B02626B03
626B11 626B12 626B13 626B21 626B31 626B32 626B33 626B61626B62
626B63 627A01 627A11 627A21 627A61 627A71 628F01 628F11628F21
628F31 628F61 628F71 629A10 629A11 629A30 629A31 629A61631A80
635A01 640B00 640A00 640B01 640A01 640B02 640A02 640B09640B10
640B11 640A10 640A11 640B12 640A12 640B60 640A60 640B61640A61
640B62 640B71 640B72 641B00 641A00 641B01 641A01 641B02641A02
641B10 641A10 641B11 641A11 641B12 641A12 641B60 641A60641B62
641B71 641A62 645B01 645A01 645B02 645A02 645B10 645A10645B11
645B12 645A11 645B60 645A60 645B61 645A61 645B70 646B01646A01
646B02 646A02 646B10 646A10 646B11 646A11 646B12 646A12646B62
646B71 646B72 CS607A61 EX640B70 EX640B71 EX640B72 EX641B70EX641B71
EX641B72 EX645B70 EX646B71 HT622A01 HT623C01 HT624B01HT625B01
HT628F01 HT635A01 HT640B01 HT640B02 HT640B71 HT641B00HT641B12
HT641B62 HT641B71 HT645B01 VO622A01 VO622A11 VO622A31
PCB压力传感器：
101A 101A02 101A03 101A04 101A05 101A06 102A02 102A05102A07 102A08
102A09 102A10 102A11 102A12 102A13 102A14 102A17 102A21102A43 102A44
102A45 102B 102A 102B03 102A03 102B04 102A04 102B06 102A06102B15 102A15
102B16 102A16 102B18 102A18 102M206 103B01 103B02 103B03103B11 103B12
103B13 105C02 105C03 105C12 105C13 105C22 105C23 105C33105C43 106B
106B50 106B51 106B52 106C10 106C20 106M160 108A02 108A04108B01 108B03
108B11 108B13 109B01 109B02 109C11 109C12 111A21 111A22111A23 111A24
111A26 112A03 112A05 112A21 112A22 112A23 112B10 112B11112B13 113B03
113B21 113A03 113A21 113B22 113A22 113B23 113A23 113B24113A24 113A26
113B26 113B27 113A27 113B28 113A28 113B31 113B32 113B33113B34 113B36
113B37 113B38 116B 116B02 116B03 117B01 117B65,117B101 &SUB 117B03
117B10 117B104 117B106 117B107 117B108 117B111 117B118117B12 117B125
117B13 117B141 117B17 117B171 117B18 117B181 117B184117B188 117B199
117B205 117B221 117B222 117B223 117B224 117B227 117B228117B229 117B230
117B232 117B235 117B237 117B238 117B242 117B243 117B25117B28 117B30
117B31 117B37 117B38 117B39 117B41 117B42 117B43 117B44117B58 117B66
117B66 117B100 117B67 117B69 117B70 117B71 117B72 117B73117B75 117B97
118A02 118B01 118B03 118B06 118B11 118B13 119B 119B02119B11 119B12
121A21 121A22 121A23 121A31 121A32 121A33 121A41 121A44121A45 122A
122A21 122A22 122A24 123A123A21 123A22 123A23 123A24 124A124A21
124A22 124A24 132A31 132A32 132A35 132A36 132A37 134A134A02 134A22
134A23 134A24 134A27 136A137A21 137A22 137A23 137A24 138A138A01
138A02 138A05 138A06 138A10 138A11 138A24 138A25 138A26138A32 138A33
138A34 138A35 138A38 138A50 138A51 140A14 1501A01EZ100PSIG1501A01EZ200PSIG
1501A01EZ2KPSIG 1501A01EZ5KPSIG 1501A01EZ60BARG1501A01FB6KPSIA 1501A01FG30PSIA
1501A01FJ150PSIA 1501A01FJ200PSIG 1501A01FJ2KPSIS1501A01FJ30PSIA 1501A01FJ500PSIG
1501A01FJ5KPSIG 1501A02EZ100PSIG 1501A02EZ10PSIG1501A02EZ150PSIG 1501A02EZ15V15GPSI
1501B22FB6KPSIS
1501B22FG2KPSIS 1501B31FB60BARA 1501B41FJ50PSIA1501B42GL2.5BARG 1502A01EZ0.7BARG
1502A01EZ100PSIG 1502A01EZ15PSIG 1502A01EZ2KPSIG1502A01EZ3.5KPSIG 1502A01EZ500PSIG
1502A01EZ5KPSIG 1502A01FJ20PSIA 1502A01FJ300PSIS1502A01GC3KPSIG 1502A02EZ100PSIG
1502A02EZ10PSIG 1502A02EZ10V10GPSI 1502A02EZ150PSIG1502A02EZ15V45GPSI
1502A02EZ200PSIG 1502A02EZ20PSIG 1502A02EZ30PSIG1502A02EZ400BARG 1502A02EZ5KPSIG
1502A02FB30PSIA 1502A02FB3KPSIS 1502A02FB500PSIA1502A02FG1KPSIG 1502A02FG1KPSIS
1502A02FG200PSIG 1502A02FG2KPSIG 1502A02FG30PSIA1502A02FG500PSIG 1502A02FJ15V45GPSI
1502A02FJ1KPSIG 1502A02FJ1KPSIS 1502A02FJ20PSIA1502A02FJ250PSIG 1502A02FJ5KPSIG
1502A02FJ6KPSIG 1502A02HG200PSIG 1502A03EZ5KPSIG1502A21FB100PSIA 1502A21FB30PSIA
1502A21FB500PSIA 1502A22FG100PSIS 1502A22FG200PSIS1502A31EZ5BARG 1502A31EZ5KPSIG
1502A41EZ10BARG 1502A41EZ400BARG 1502A41FG100PSIA1502A84FG200PSIS 1502B01EZ100PSIG
1502B01EZ15V15GPSI 1502B01EZ15V45GPSI 1502B01EZ500PSIG1502B01EZ50PSIG
1502B01EZ5V20GPSI 1502B01FG100PSIA 1502B01FG15PSIA1502B01FG30PSIA 1502B01FG50PSIA
1502B01FJ100PSIS 1502B01FJ500PSIG 1502B01GC15PSIA1502B01GL15V30GPSI 1502B01GL15V45GPSI
1502B01GL50PSIG 1502B02EZ10PSIG 1502B02EZ15V45GPSI1502B02EZ300PSIG 1502B02EZ3KPSIG
1502B02EZ50PSIG 1502B02EZ5KPSIG 1502B02FB10PSIS1502B02FB1KPSIA 1502B02FG15V30GPSI
1502B02FG15V500GPSI 1502B02FG20PSIA 1502B02FG300PSIA1502B02FG30PSIA 1502B02FJ100PSIS
1502B02FJ1BARA 1502B02FJ1V3GBAR 1502B02FJ500PSIG1502B02GC1KPSIA 1502B02GC5KPSIS
1502B02GL10PSIG 1502B02GL15V50GPSI/20 1502B02GL400BARG1502B02HG100PSIG
1502B03EZ500PSIG 1502B03FJ100PSIG 1502B03FJ30PSIG1502B03FJ50PSIG 1502B03HG10PSIG/30
1502B03HG15PSIG/30 1502B12EZ300BARG 1502B12FB50PSIA1502B12FJ500PSIG 1502B12GD1KPSIS
1502B21EZ100BARG 1502B21FB50PSIA 1502B21FG15PSIG1502B21FG200PSIA 1502B21FG2KPSIG
1502B21FG3KPSIG 1502B21FG50PSIG 1502B21FG5KPSIS1502B21FJ200PSIA 1502B22FJ15V45GPSI
1502B22FJ200PSIG 1502B22FJ3KPSIG 1502B22FJ50PSIA1502B41EZ1V1GBAR 1502B41EZ3BARG
1502B41FB100BARS 1502B41FB250BARS 1502B42EZ10BARG1502B62FG3BARG 1502B62GL1BARG
1502B62GL6BARG 1502B71GL15V50GPSI/20 1502B71GL1BARG1502B71GL6BARG 1502B80EZ10PSIG
1502B81EZ100PSIG 1502C02HG10BARG 1502C02HG5BARG1502C02HG5KPSIG 1503A01FG100PSIG
1503A01FK100PSIG 1503A02EZ100PSIG 1503A02EZ10PSIG1503A02EZ150PSIG 1503A02EZ15V200GPSI
1503A02EZ15V35GPSI 1503A02EZ15V45GPSI 1503A02EZ1KPSIG1503A02EZ1V10GBAR
1503A02EZ250PSIG 1503A02EZ50PSIG 1503A02EZ5BARG1503A02EZ60BARG 1503B62FK100PSIA 1503B71EZ100PSIG1503B71FH200PSIA 1503B71GL15V45GPSI 167A11 175A01
1503B81FK15PSIA 1503B81GL150PSIG 1503B81GL30PSIG 165A01165A02 165A03 165A05 165B02