选用变频器的类型，按照生产机械的类型、调速范围、静态速度精度、起动转矩的要求，决定选用那种控制方式的变频器合适。所谓合适是既要好用，又要经济，以满足工艺和生产的基本条件和要求 

需要控制的电机及变频器自身

1）电机的数。一般电机数以不多于(为宜，否则变频器容量就要适当加大。

2）转矩特性、临界转矩、加速转矩。在同等电机功率情况下，相对于高过载转矩模式，变频器规格可以降额选取。3）电磁兼容性。为减少主电源干扰，使用时可在中间电路或变频器输入电路中增加电抗器，或安装前置隔离变压器。一般当电机与变频器距离超过50m时，应在它们中间串入电抗器、滤波器或采用屏蔽防护电缆 

变频器功率的选用

系统效率等于变频器效率与电动机效率的乘积，只有两者都处在较高的效率下工作时，则系统效率才较高。从效率角度出发，在选用变频器功率时，要注意以下几点： 

1）变频器功率值与电动机功率值相当时合适，以利变频器在高的效率值下运转。 

2）在变频器的功率分级与电动机功率分级不相同时，则变频器的功率要尽可能接近电动机的功率，但应略大于电动机的功率。 

3）当电动机属频繁起动、制动工作或处于重载起动且较频繁工作时，可选取大一级的变频器，以利用变频器长期、地运行。 

4）经测试，电动机实际功率确实有富余，可以考虑选用功率小于电动机功率的变频器，但要注意瞬时峰值电流是否会造成过电流保护动作。 

5）当变频器与电动机功率不相同时，则相应调整节能程序的设置，以利达到较高的节能效果 

Pipe Bender & Guide Heavy Duty (MS124)

PIPE BENDER

pipe bender

Pines Tube Bender Dial-A-Bend Control Parts

Pines Tube Bender Dial-A-Bend Control Parts

Pines Tube Bender Dial-A-Bend Control Parts

Pines M34561 Vertical Bender w/Remote Pedestal Control 20HP Wired 460V

Pines Hydraulic Tube Bender Control Parts Dial-A-Bend, Leonard, PHI,

Pines Bender, Technology Hydraulic Rotary Machine, Owners Operations Manual 1996

Pines Bender, Hydraulic Rotary Owner Operation Schematics Parts & Tooling Manual

PINES BENDER SAFETY CIRCUIT BOARD          

Pines Bender Control Screen Tube (PHI, Conrac, Leonard)

Pines Bender Control Face Plate (PHI, Conrac, Leonard)d

PINES BENDER CIRCUIT BOARD LOT         

PINES BENDER CIRCUIT BOARD Rev. 0         

PINES BENDER CIRCUIT BOARD          

PINES BENDER CIRCUIT BOARD Rev. D         

PINES BENDER CIRCUIT BOARD          

Pines 3T Vertical Bender

Pines 3T Tube Bender

Pines #4 w/ #3 Cylinder Tube Bender Operator Manual

Pines #3 Tube Bender, Operators owner Manual 1948

PINES #2 hydraulic Tube Bender mandrel extractor eaton leonard crippa addison

PINES #2 High Speed Tube Bender w mandrel extractor,        1979 w updated controls

Pines #2 Bender Safety Guard NOS (PHI, Conrac, Leonard)

Pines #1 LH Bender Safety Guard NOS (PHI, Conrac, Leonard)

Pines #1 Bender Safety Guard (PHI, Conrac, Leonard) a

PINES # 1 (PR Machinery) Hydraulic Tube Pipe Bender with Leonard side winder

PIN WELDER / BENDER AUTOMATED MODEL 1BV w/ UNITEK SERIES 180 THIN LINE WELDER

PHI Bender Control          (Pines, Conrac, Leonard)

PHI 210 RH HYDRAULIC TUBE BENDER 1 1/2" 120" MAX TUB LENGTH, 8" MAX RADIUS 5 Hp

Pexto slip roller rolls roll former tube ring cone bender 381d

Pexto 36" Bar Folder w/Cheek Bender Attachment peck stow and Wilcox

PEXTO - ROPER WHITNEY HAND SEAMER SHEET metaL BENDER TOOL HVAC FABRICATION

PEDRICK PIPE AND TUBE BENDER MODEL A-3 / REBUILT (OC677)

Pedrick B 10 Tube Pipe Flats Bender Rotary Compression CNC Dies Price Lowered

PEDRAZZOLI TUBE PIPE TWIN HEAD BENDING MACHINE BEND MASTER 38 2T MRVIMS BENDER

Pedrazzoli CNC Tube Bender - Universal Brown 60

PECO 3/4" E.M.T. Conduit Bender Electrical Contractor ~ Electricians Tool #639

PBB04 SEALEY metaL BENDER BENCH MOUNTING [Benders, metal metal Benders]        !

Parker/Lakeland 632 Hydraulic Bender Vise Faces

PARKER Tubibg/Conduit Bender No. 10-2829 5/8" O.D.

Parker Tube Pipe bender 3/8" dia 15/16" Radius Good Condition

Parker Tube Pipe bender 102R 65115 Good Condition

Parker Tube Bender Model 412 Including 5 Radius Blocks

Parker Tube Bender Model 412 Including 4 Radius Blocks & Bench Mounting Adapter

PARKER TUBE BENDER MODEL 412

PARKER TUBE BENDER # 624 ?TUBING BENDER DIES PARKER PIPE BENDER

Parker Model 848 Tube Bender Instruction & Parts Manual

PARKER HANNIFIN TUBE BENDER NO. 6-2829R 3/8

Parker Hannifin No. 6 6-2829R 3/8" Tubing Bender

PARKER HANNIFIN 3/4" O.D 3 3/4" RADIUS HAND TUBE BENDER

PARKER HANNIFIN 3/4 OD 3-3/4 RADIUS PIPE BENDER NO. 12-2829R

PARKER HANNIFIN 1/2" TUBING BENDER

Parker Bender Lakeland bender 1-3/4 X 7 Bending shoe and Follow bar

Parker and Other 632 Hydraulic Bender Parts

PARKER 412 Tube Bender/Shoes & Blocks / Ridgid Tubing Cutter & Ridgid Flare Tool

Parker / Lakeland #6 3/8" OD Tube Bender Slide Block 5" Long         

Parker / Lakeland #6 3/8" OD Tube Bender Clamp Block         

PARKER & IMPERIAL HANDTUBE BENDERS

Pair of KBS Rollobend Long Radius Tube Benders #8100 1/2" - 5" R & # 4100 1/4"

PAIR OF Current Tools 670 Screw Type Reel Jack Stands          FREE SHIPPING

Pack of 5 Different Colored Electrical Tape by GB Gardener Bender GTPC-550

OX-400N Gb-Gardner Bender 4Oz Anti-Oxidant Compound OX-400N fresh LOT OF (2)

OX-400N Gb-Gardner Bender 4Oz Anti-Oxidant Compound OX-400N fresh

OUTER PIPE SPRING BENDER 16MM,20MM TOOLS PIPEWORK

Orthopedic Small Bone Plate Benders for Plates up to 2.7mm-Keebomed

Orthopedic Plate Bender Small Plate bending I