全新Allen-bradley罗克韦尔模块1756-OC8

由于电机产生的转矩与供电电压的平方成正比,降低端电压将减少转矩.降低电压实际上是降低了电机的额定输出功率.也意味着所需磁场能量的减少.利用这一原理.Powerboss(节电宝)可以在从空载至多数负载情况下保持恒定的电机效率.
Powerboss(节电宝)采用智能化的微处理器控制,*人工调节.在轻负载的情况下电机的电压自动降至较低需求,而转速保持恒定,因此降低了不必的损耗.如果负载增加,电压将自动上升以防止电机失速.

Powerboss (节电宝)通过闭环反馈系统控制,其感应电路比较通过电机的电压和电流波形.由于是电感电路,电压和电流波形存在时间差,负载越轻,电流波形的滞后越大.空载时电机的效率较低,波形间的间隔也越大.微处理器将监测波形间的间隔并相应地调整可控硅的触发脉冲,其速度为每秒钟改变100次.这一速度比电机所能响应的速度要快得多,但对防止电机在任何负载工况出现失速是十分必要的.
原则上,在轻载条件下,如果可以将过剩的励磁电流减少到仅仅与保持负荷的恒定转矩相匹配,则可使电机的运行效率提高.
Powerboss(节电宝)通过改变电机的相位角来实现控制.下图中,电压V和电流I均以相量形式表示.两者之间的夹角即相位角.可定为电流**前或滞后电压的量.对于感应电机,电流通常滞后于电压.功率因数(QPF)是量化的电流—电压滞后的三角关系.

电机功率因素与相位角关系之描述

在不同的负荷条件下,相位角将随之改变.下图是电机电压和电流在不同负荷条件下的说明.请注意:在部分负荷条件下,相位角或电压电流之间的时间滞后将增加.通常在负载情况下,电机的电流滞后于电压30度﹔在空载情况下,电机电流滞后于电压80度.

CHROMATE 91487 1 TAPER PIN SPIRAL STEEL REAMER D594235

MORSE ADJUSTABLE SIZE C STEEL 19/32-21/32IN REAMER D594187

CHROMATE 91486 #0 SPIRAL TAPER PIN STEEL REAMER D594200

MORSE 2A ADJUSTABLE STEEL 7/16-15/32IN REAMER D594212

CLEVELAND #5 HIGH SPEED STEEL REAMER D594199

MR&T #901 HIGH SPEED STEEL 9/16IN REAMER D594201

CLEVELAND G310 HIGH SPEED STEEL 11/32IN REAMER D594197

MR&T #7 HIGH SPEED STEEL REAMER D594196

MORSE STEEL 1/2IN REAMER D594190

ADJUSTABLE HIGH SPEED STEEL 23/32-25/32IN REAMER D594214

CLEVELAND 29 PEERLESS HIGH SPEED STEEL 21/32IN REAMER D594216

CLEVELAND 35261 PEERLESS HIGH SPEED STEEL 5/8IN REAMER D594218

CHROMATE 91488 #2 TAPER PIN SPIRAL STEEL REAMER D594231

MORSE 3A ADJUSTABLE STEEL 7/16-15/32IN REAMER D594213

MR&T HIGH SPEED STEEL 9/16IN REAMER D594230

CLEVELAND 06649 PEERLESS HIGH SPEED STEEL 11/16IN REAMER D594226

10354 30 DEGREE TAPERED STEEL REAMER D594181

153 15 DEGREE TAPERED REAMER D594163

033 45 DEGREE TAPERED STEEL REAMER D594178

10355 30 DEGREE TAPERED STEEL REAMER D594180

1IN-82 HIGH SPEED STEEL COUNTERSINK D594485

DTC EX9 1-1/16 SCREW EXTRACTOR STEEL D594481

STRAIGHT FLUTE TAPER PIN STEEL REAMER D594432

CLEVELAND 16701 PEERLESS HIGH SPEED STEEL 19/32IN REAMER D594425

MORSE EDP25741 1/4 X 13/32 STEEL SHANK D594501

CHAMPION 798-6 7/32IN COUNTERSINK STEEL D594516

APT 10 HIGH SPEED TYPE-1 STEEL REAMER D594507

CLEVELAND 6406 PEERLESS HIGH SPEED STEEL 29/32IN REAMER D594499

MORSE 1785A 7/16 X 11/16 TAPER SHANK STEEL D594439

DTC 5/32-1/2IN STEEL TAP AND REAMER WRENCH D594420

CLEVELAND 32157 PEERLESS HIGH SPEED STEEL 13/16IN REAMER D594418

UNION TWIST HS-12 HIGH SPEED STEEL 15/32IN REAMER D594210

DUMONT GREENFIELD 33364 KEYWAY BROACH BUSHING D STYLE 2-7/16 IN STEEL D546543

DUMONT GREENFIELD 33366 KEYWAY BROACH BUSHING D STYLE 2-9/16 IN STEEL D546544

DUMONT GREENFIELD 33365 KEYWAY BROACH BUSHING D STYLE 2-1/2 IN STEEL D546545

DUMONT GREENFIELD 33368 KEYWAY BROACH BUSHING D STYLE 2-11/16 IN STEEL D546546

DUMONT GREENFIELD 33371 KEYWAY BROACH BUSHING D STYLE 2-7/8 IN STEEL D546549

DUMONT GREENFIELD 33363 KEYWAY BROACH BUSHING D STYLE 2-3/8 IN STEEL D546552

DUMONT GREENFIELD 33350 KEYWAY BROACH BUSHING D STYLE 1-9/16 IN STEEL D546560

DUMONT GREENFIELD 33361 KEYWAY BROACH BUSHING D STYLE 2-1/4 IN STEEL D546554

DUMONT GREENFIELD 33360 KEYWAY BROACH BUSHING D STYLE 2-3/16 IN STEEL D546555

DUMONT GREENFIELD 33345 KEYWAY BROACH BUSHING C STYLE 1-7/16 IN STEEL D546558

PRECISION 209 29/32 IN STEEL DRILL BIT D552598

DUMONT GREENFIELD 33345 KEYWAY BROACH BUSHING C STYLE 1-7/16 IN STEEL D546566

HIGH SPEED STEEL 3/4IN REAMER D594678

CLEVELAND PEERLESS HIGH SPEED STEEL 23/32IN REAMER D594680

MORSE AV10 170109 MASTER COBALT BI-METAL HOLE SAW 16MM 5/8 IN D575796

MORSE ADJUSTABLE STEEL REAMER 27/32-15/16 D594626

NATIONAL HIGH SPEED STEEL 29/32IN REAMER D594602

SF-11 STANDARD CUT CARBIDE BURR 1/8IN D586784

SF-11 DOUBLE CUT CARBIDE BURR 1/8IN D586783

CHROMATE HEAVY DUTY HIGH SPEED TWIST STEEL 3/8IN X 12IN DRILL BIT D587968

DEWALT DW5700 ROTARY HAMMER 10 IN 3/8 IN CARBIDE DRILL BIT D546768

CLEVELAND 04638 HIGH SPEED SHANK 47/64 IN STEEL DRILL BIT D568480