IC640HWP771，IC640HWP771，IC640HWP771
感應式雙速異步電動機變速控制電路
由電動機的原理可知，感應式異步電動機的轉速表達式為：
（ 2-4 ）
由此可知電動機的轉速與電源頻率 f 、轉差率 s 及定子繞組的磁極對數 p 有關，改變異步電動機的轉速可通過三種方法來實現：一是改變電源頻率 f ；二是改變轉差率 s ；三是改變磁極對數 p 。本節主要介紹通過改變磁極對數 p 的方法來實現電動機變極調速的基本控制線路。
１．變極式電動機的接線方式
變極式電動機是通過改變半相繞組的電流方向來改變極數，圖 2-27 為常用兩種接線圖，即△ -YY 和 Y-YY 。
（ 1 ）△ -YY 連接
如圖 2.27 （ a ）所示，連接成△形時，將 U1 、 V1 、 W1 端接電源， U2 、 V2 、 W2 端懸空。連接成 YY 形時，將 U1 、 V1、 W1 端接成 Y 點，將 U2 、 V2 、 W2 端接電源。
（ 2 ） Y-YY 連接
如圖 2.27 （ b ）所示，連接成 Y 形時，將 U1 、 V1 、 W1 端接電源， U2 、 V2 、 W2 端懸空。連接成 YY 形時，將 U1 、 V1、 W1 端和中性點 O 連接在一起，將 U2 、 V2 、 W2 端接電源。
２．感應式雙速異步電動機按鈕控制的調速
WOW !
Allen Bradley 8520-AA12 Servo Amplifier 3 AXIS ! WOW !
Allen Bradley 8520-1S5A-BAT-EX4-T1-Y-4-5-7 3Ph Servo Drive 380/480VAC ! WOW !
Allen Bradley 8510A-A11-A2 Drive Spindle 230V WOW
Allen Bradley 6186-M12ALTR Versaview 12" Touch Panel ! WOW !
Allen Bradley 6185-CBZABZZ Panelview Operating Interface ! WOW !
Allen Bradley 6182H-12KEH4D Versaview 6189-RPRH ! WOW !
Allen Bradley 6181F-17TPXPSS 6181F17TPXPSS 17'' Industrial Computer * Test*
ALLEN BRADLEY 6181-CHBBFAZFZ SER B VERSAVIEW (2E5)
ALLEN BRADLEY 6181-CGCCBZZZZ *TESTED* Industrial Computer Panelview
ALLEN BRADLEY 6181-CGCCBBZZA *TESTED* Industrial Computer Panelview
ALLEN BRADLEY 6160-PCD2 OPERATOR INTERFACE TERMINAL T60 SER. C
Allen Bradley 2771-TC1 Touchscreen Panel View ! WOW !
Allen Bradley 2711-T9A5 Operator Interface Panel 9" ! WOW !
Allen Bradley 2711-T6C8L1 Operator Interface Panel View 600 24VDC 17W ! WOW !
Allen Bradley 2711-T14C9 Panelview 1400 BRAND
Allen Bradley 2711-T10C8 Operator Interface Touchscreen Colour ! WOW !
Allen Bradley 2711-T10C20 PanelViewPlus 1000 Touch Color Terminal ! WOW !
Allen Bradley 2711P-T7C4B2 Panelview Plus 700 Touch Screen Operator WOW
Allen Bradley 2711P-T12C4D2 PV Plus 1250 Colour Touch Display Module ! WOW !
Allen Bradley 2711P-T10C4D1 PanelView Plus 1000 Terminal 64MB ! WOW !
Allen Bradley 2711P-T10C4B2 PanelViewPlus 1000 Touch Operator Interface ! WOW !
Allen Bradley 2711P-RDT10C PanelViewPlus Display Touch Screen 10.4" Color ! WOW
ALLEN BRADLEY 2711P-RDB15C, RP2AX, K15C4A2, RN6 PANELVIEW PLUS 1500 (1C4)
Allen Bradley 2711P-K10C4B2 PanelViewPlus Operator Interface ! WOW !
Allen Bradley 2711P-B7C4D2 Panelview Plus 700 Touch ! WOW !
Allen Bradley 2711P-B15C4D1 Panelview Plus 1500 Key/Touch ! WOW !
Allen Bradley 2711P-B10C4D8 PanelViewPlus1000 Keypad/Touch Color Terminal ! WOW
Allen Bradley 2711P-B10C4D1 Keypad/Touch Operator Interface Panel 10.4" ! WOW !
Allen Bradley 2711-KA1X Panelview 1200 Operator Interface Station ! RFB !
Allen Bradley 2711-K9A5 Panel View 110V 50/60HZ .85A ! !
Allen Bradley 2711-K5A2X Panel View 550 Keypad WOW
Allen Bradley 2711-K14C8 Operator Interface PV1400 Colour ! WOW !
Allen Bradley 2711-K10C9 Operator Interface Panelview RS232 ! WOW !
Allen Bradley 2711-K10C3 Panelview 1000 Operator Interface ! WOW !
Allen Bradley 2711E-T14C6X 1400E Panelview Series E Rev B FRN5.16 ! WOW !
ALLEN BRADLEY 2711E-T10C6 PANELVIEW 1000E
Allen Bradley 2711-B6C5 Panel View 600 Operator Interface ! !
Allen Bradley 2711-B6C20 PanelView600 Key/Touch Color Terminal 6-Inch ! WOW !
Allen Bradley 2711-B5A20 /H PanelView 550 Mono/Touch/Key/EtherNet FRN 4.41
Allen Bradley 2711-B5A2 Monochrome Touchpad Display 5.5" *Parts Only* ! AS IS
Allen Bradley 2711-B5A10X Panelview 550 ! WOW !
Allen Bradley 2711-B5A10X Panelview 550 - AS IS !
Allen Bradley 2711-B5A10 5.5" Monochrome Touch Screen Keypad Display ! WOW !
Allen Bradley 2707-L8P2 Operator Interface Panel LCD Control ! !
Allen Bradley 2706-P42C InView Message Marquee Display WOW
Allen Bradley 2705-P22C3 Pushbutton Station Panel !
Allen Bradley 22D-E9P9N104 IP20 AC Drive 9.9A 3Ph 600 VAC ! WOW !
Allen Bradley 22C-D072A103 PowerFlex AC Drive 480VAC 50HP 3PH 72A IP30 ! WOW !
Allen Bradley 22BE032A0AYNANC0 PowerFlex700 AC Drive 3PH 32A IP20 600VAC ! !
Allen Bradley 20DE022A3EYNANCNL PowerFlex700S AC Drive 3Ph 20/15HP 600VAC ! WOW
Allen Bradley 20BE022A0AYNAND0 AC Drive 20HP 600V ! !
Allen Bradley 20BD052A0AYNAND0 PowerFlex700 AC Drive 3Ph 52A 480VAC ! WOW !
Allen Bradley 20BD040A0AYNAND0 Power Flex AC Drive 25/30HP 120V 480VAC ! WOW !
Allen Bradley 20AE6P1A0AYNNNNN AC Drive 3PH 600VAC ! WOW !
Allen Bradley 20AE6P1A0AYNNNNN *For Parts Only* ! AS IS
Allen Bradley 20AE3P9A0AYNNNNN AC Drive 600V PF70 ! WOW !
