H12VXBG0B9B
变频器
变频器是利用电力半导体器件的通断作用将工频电源变换为另一频率的电能控制装置,能实现对交流异步电机的软起动、变频调速、提高运转精度、改变功率因数、过流/过压/过载保护等功能。
PWM和PAM的不同点
PWM是英文Pulse Width Modulation(脉冲宽度调制)缩写,按一定规律改变脉冲列的脉冲宽度,以调节输出量和波形的一种调制方式。PAM是英文Pulse Amplitude Modulation (脉冲幅值调制) 缩写,是按一定规律改变脉冲列的脉冲幅度,以调节输出量值和波形的一种调制方式。
3、电压型与电流型有什么不同?
变频器的主电路大体上可分为两类:电压型是将电压源的直流变换为交流的变频器,直流回路的滤波是电容;电流型是将电流源的直流变换为交流的变频器,其直流回路滤波是电感。
4、为什么变频器的电压与频率成比例的改变?
任何电动机的电磁转矩都是电流和磁通相互作用的结果,电流是不允许超过额定值的,否则将引起电动机的发热。因此,如果磁通减小,电磁转矩也必减小,导致带载能力降低。
由公式E=4.44*K*F*N*Φ 可以看出,在变频调速时,电动机的磁路随着运行频率fX是在相当大的范围内变化,它极容易使电动机的磁路严重饱和,导致励磁电流的波形严重畸变,产生峰值很高的尖峰电流。
因此,频率与电压要成比例地改变,即改变频率的同时控制变频器输出电压,使电动机的磁通保持一定,避免弱磁和磁饱和现象的产生。这种控制方式多用于风机、泵类节能型变频器。
5、电动机使用工频电源驱动时,电压下降则电流增加;对于变频器驱动,如果频率下降时电压也下降,那么电流是否增加?
频率下降(低速)时,如果输出相同的功率,则电流增加,但在转矩一定的条件下,电流几乎不变。
6、采用变频器运转时,电机的起动电流、起动转矩怎样?
采用变频器运转,随着电机的加速相应提高频率和电压,起动电流被限制在150%额定电流以下(根据机种不同,为125%~200%)。用工频电源直接起动时,起动电流为额定电流6~7倍,因此,将产生机械电气上的冲击。采用变频器传动可以平滑地起动(起动时间变长)。起动电流为额定电流的1.2~1.5倍,起动转矩为70%~120%额定转矩;对于带有转矩自动增强功能的变频器,起动转矩为100%以上,可以带全负载起动。
7、V/f模式是什么意思?
频率下降时电压V也成比例下降,这个问题已在回答4说明。V与f的比例关系是考虑了电机特性而预先决定的,通常在控制器的存储装置(ROM)中存有几种特性,可以用开关或标度盘进行选择。
8、按比例地改V和f时,电机的转矩如何变化?
频率下降时完全成比例地降低电压,那么由于交流阻抗变小而直流电阻不变,将造成在低速下产生地转矩有减小的倾向。因此,在低频时给定V/f,要使输出电压提高一些,以便获得一定地起动转矩,这种补偿称增强起动。可以采用各种方法实现,有自动进行的方法、选择V/f模式或调整电位器等方法。
9、在说明书上写着变速范围60~6Hz,即10:1,那么在6Hz以下就没有输出功率吗?
在6Hz以下仍可输出功率,但根据电机温升和起动转矩的大小等条件,**使用频率取6Hz左右,此时电动机可输出额定转矩而不会引起严重的发热问题。变频器实际输出频率(起动频率)根据机种为0.5~3Hz。。
10、对于一般电机的组合是在60Hz以上也要求转矩一定,是否可以?
通常情况下时不可以的。在60Hz以上(也有50Hz以上的模式)电压不变,大体为恒功率特性,在 高速下要求相同转矩时
11、所谓开环是什么意思?
给所使用的电机装置设速度检出器(PG),将实际转速反馈给控制装置进行控制的,称为“闭环 ”,不用PG运转的就叫作“开环”。通用变频器多为开环方式,也有的机种利用选件可进行PG反馈.无速度传感器闭环控制方式是根据建立的数学模型根据磁通推算电机的实际速度,相当于用一个虚拟的速度传感器形成闭环控制。
12、实际转速对于给定速度有偏差时如何办?
开环时,变频器即使输出给定频率,电机在带负载运行时,电机的转速在额定转差率的范围内(1%~5%)变动。对于要求调速精度比较高,即使负载变动也要求在近于给定速度下运转的场合,可采用具有PG反馈功能的变频器(选用件)。
13、如果用带有PG的电机,进行反馈后速度精度能提高吗?
具有PG反馈功能的变频器,精度有提高。但速度精度的值取决于PG本身的精度和变频器输出频率的分辨率。
14、失速防止功能是什么意思?
如果给定的加速时间过短,变频器的输出频率变化远远超过转速(电角频率)的变化,变频器将因流过过电流而跳闸,运转停止,这就叫作失速。为了防止失速使电机继续运转,就要检出电流的大小进行频率控制。当加速电流过大时适当放慢加速速率。减速时也是如此。两者结合起来就是失速功能。
15、有加速时间与减速时间可以分别给定的机种,和加减速时间共同给定的机种,这有什么意义?
加减速可以分别给定的机种,对于短时间加速、缓慢减速场合,或者对于小型机床需要严格给定生产节拍时间的场合是适宜的,但对于风机传动等场合,加减速时间都较长,加速时间和减速时间可以共同给定。
16、什么是再生制动?
电动机在运转中如果降低指令频率,则电动机变为异步发电机状态运行,作为制动器而工作,这就叫作再生(电气)制动。
17、是否能得到更大的制动力?
从电机再生出来的能量贮积在变频器的滤波电容器中,由于电容器的容量和耐压的关系,通用变频器的再生制动力约为额定转矩的10%~20%。如采用选用件制动单元,可以达到50%~100%。
18、请说明变频器的保护功能?
保护功能可分为以下两类:
(1)检知异常状态后自动地进行修正动作,如过电流失速防止,再生过电压失速防止。
(2)检知异常后封锁电力半导体器件PWM控制信号,使电机自动停车。如过电流切断、再生过电压切断、半导体冷却风扇过热和瞬时停电保护等。
19、为什么用离合器连接负载时,变频器的保护功能就动作?
用离合器连接负载时,在连接的瞬间,电机从空载状态向转差率大的区域急剧变化,流过的大电流导致变频器过电流跳闸,不能运转。
20、在同一工厂内大型电机一起动,运转中变频器就停止,这是为什么?
电机起动时将流过和容量相对应的起动电流,电机定子侧的变压器产生电压降,电机容量大时此压降影响也大,连接在同一变压器上的变频器将做出欠压或瞬停的判断,因而有时保护功能(IPE)动作,造成停止运转。 21、什么是变频分辨率?有什么意义?
对于数字控制的变频器,即使频率指令为模拟信号,输出频率也是有级给定。这个级差的**小单位就称为变频分辨率。 变频分辨率通常取值为0.015~0.5Hz.例如,分辨率为0.5Hz,那么23Hz的上面可变为23.5、24.0 Hz,因此电机的动作也是有级的跟随。这样对于像连续卷取控制的用途就造成问题。在这种情况下,如果分辨率为0.015Hz左右,对于4级电机1个级差为1r/min 以下,也可充分适应。另外,有的机种给定分辨率与输出分辨率不相同。
22、装设变频器时安装方向是否有限制。
变频器内部和背面的结构考虑了冷却效果的,上下的关系对通风也是重要的,因此,对于单元型在盘内、挂在墙上的都取纵向位,尽可能垂直安装。
23、不采用软起动,将电机直接投入到某固定频率的变频器时是否可以?
在很低的频率下是可以的,但如果给定频率高则同工频电源直接起动的条件相近。将流过大的起动电流(6~7倍额定电流),由于变频器切断过电流,电机不能起动。
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ALLEN BRADLEY W35 W35
Allen Bradley W35 Heater Element
Allen Bradley W34 Overload Thermal Unit Heating Element (Pack of 3) -
ALLEN BRADLEY W34 W34
Allen Bradley W34 Heater Element
ALLEN BRADLEY W33 W33
Allen Bradley W33 Heater Element
Allen Bradley W32 Heater Element
ALLEN BRADLEY W31 W31
Allen Bradley W31 Heater Element
Allen Bradley W30 Heater Element
ALLEN BRADLEY W29 W29
Allen Bradley W29 Heater Element
ALLEN BRADLEY W28 W28
ALLEN BRADLEY W26 W26
Allen Bradley W26 Heater Element
ALLEN BRADLEY W24 W24
Allen Bradley W23 Heater Element
Allen Bradley W20 Heater Element
ALLEN BRADLEY W18 W18
ALLEN BRADLEY W17 W17
ALLEN BRADLEY W16 W16
ALLEN BRADLEY W15 W15
ALLEN BRADLEY W14 W14
ALLEN BRADLEY W13 W13
ALLEN BRADLEY W12 W12
ALLEN BRADLEY W11 W11
ALLEN BRADLEY W10 W10
ALLEN BRADLEY TYPE-P 10A 600V AC RELAY SER.A 700-Y732738/1 104393
Allen Bradley Type P Second Deck Cat. Model 700-PB40
ALLEN BRADLEY TYPE P AC RELAY 700-P600A1
ALLEN BRADLEY TYPE N ConTROL RELAY 700DC-N410A1 SER C
Allen Bradley Type J JA1L040S104UC Potentiometer
Allen Bradley Type J 38252 Potentiometer
ALLEN BRADLEY TYPE H ConTROL RELAY NIB 700-HB33A1 SER A 99551
Allen Bradley Twist to Release 40mm E stop Button Pt no 800FP-MT44PX01S
Allen Bradley TTL Output Module 1771-OCG (+5V)
Allen Bradley TTL Input Module 1771-IGC #68748
Allen Bradley Transparent Boot 800H-N11 For Watertight Push to Test Pilot Light
ALLEN BRADLEY TRANSISTOR CIRCUIT BOARD CARD 135655 135656 REV 02
ALLEN BRADLEY TRANSFORMER KIT INDUCTOR 15HP 15 HP 460V SP-135782 120766-7-02
ALLEN BRADLEY TRAILER FUSE BLOCK X-400656
Allen Bradley Trailer Fuse Block Kit w/Bracket 149V-FS30 SERIES A
ALLEN BRADLEY TOWER STACK LIGHT 855T-B10DN4 SER. B * *
Allen Bradley Top Wired NEMA Size 0 Motor Contactor 500-AOD930 120VAC Coil
Allen Bradley Time Delay Relay 700-NT200A1 Ser C #14358
ALLEN BRADLEY TIME DELAY RELAY 700-HT12AA1 120VAC CNC CINCINNATI MILACRON
Allen Bradley Time Delay Relay 700-HT12AA1
Allen Bradley Thermal Overload Element W65
Allen Bradley Terminal Blocks Lot Of 11 1492-W10
ALLEN BRADLEY TERMINAL BLOCK ACCESSORY 1492-N2 NIB LOT OF 32
ALLEN BRADLEY TERMINAL BLOCK 1492-U *LOT OF 5*
ALLEN BRADLEY TERMINAL base SER A REV B01 1794-TB3 99153
Allen Bradley Terminal base 3Wire 1794-TB3 Series A
Allen Bradley Terminal base 1794-TBN Ser A #68514
Allen Bradley Terminal base 1794-TBN Ser A #60415
Allen Bradley Terminal base 1794-TB3 Ser A #53950
Allen Bradley TA-862 200V 60Hz Coil IN BOX
Allen Bradley Sz 0 Motor Starter # 509-AOD, No Heaters, , WARRANTY
ALLEN BRADLEY SWITCH, 800T-16HL2KB6, ORANGE, SER T, 120VAC, .27 WATTS
Allen Bradley Switch 1494V-M40 Ser A #47077
Allen Bradley Switch 1494V-M40 Ser A #47076
ALLEN BRADLEY SWITCH #800T-B2 SERIES B
ALLEN BRADLEY SURGE SUPPRESSOR LOT OF 3 199-FSMA1 SER B
ALLEN BRADLEY SURGE SUPPRESSOR 199-FSMA9 SER. B NIB
ALLEN BRADLEY STRAIGHT FEMALE ConNECTOR 871A-TS5-D1
Allen Bradley Stereo-Potentiometer, 2x 250 Ohm lin, Type J, mit Schalter, NOS
Allen Bradley Steady Incandescent Stack Light 855T-B10DN4, Red, , WARRANTY
ALLEN BRADLEY STATIonARY ConTACT BLOCK ASSEMBLY X-355647 X355647 (NIB)
ALLEN BRADLEY STATION ConNECTOR 1770-SC
Allen Bradley Starter Overload 193-EB1DB 1.0 - 2.9A
Allen Bradley starter coil 240V 69A83
Allen Bradley starter coil 120V 69A86
ALLEN BRADLEY STARTER 709-BOD103 SER K