1398-DDM-019 数控模块

低压通用变频输出电压为380～650V，输出功率为0.75～400kW，工作频率为0～400Hz，它的主电路都采用交-直-交电路。其控制方式经历了以下四代。

1.U/f=C的正弦脉宽调制(SPWM)控制方式

其特点是控制电路结构简单、成本较低，机械特性硬度也较好，能够满足一般传动的平滑调速要求，已在产业的各个领域得到广泛应用。但是，这种控制方式在低频时，由于输出电压较低，转矩受定子电阻压降的影响比较，使输出大转矩减小。另外，其机械特性终究没有直流电动机硬，动态转矩能力和静态调速性能都还不尽如人意，且系统性能不高、控制曲线会随负载的变化而变化，转矩响应慢、电机转矩利用率不高，低速时因定子电阻和逆变器死区效应的存在而性能下降，稳定性变差等。因此人们又研究出矢量控制变频调速。

2.电压空间矢量(SVPWM)控制方式

它是以三相波形整体生成效果为前提，以逼近电机气隙的理想圆形旋转磁场轨迹为目的，一次生成三相调制波形，以内切多边形逼近圆的方式进行控制的。经实践使用后又有所改进，即引入频率补偿，能速度控制的误差；通过反馈估算磁链幅值，低速时定子电阻的影响；将输出电压、电流闭环，以动态的精度和稳定度。但控制电路环节较多，且没有引入转矩的调节，所以系统性能没有得到根本改善。

GENERAL ELECTRIC DS3800HVDB1J1F PC BOARD **

GENERAL ELECTRIC DS3800HUMB1B1B   DS3800HUMB1B1B

GENERAL ELECTRIC DS3800HUMB1B1B MEMORY BOARD UNIVERSAL **

General Electric DS3800HUMB1B1B Board

GENERAL ELECTRIC DS3800HUMB1B1A CIRCUIT BOARD *OUT OF *

GENERAL ELECTRIC DS3800HUMB1A1A BOARD UNIVERSAL MEMORY **

GENERAL ELECTRIC DS3800HUMB1A1A BOARD UNIVERSAL MEMORY

GENERAL ELECTRIC DS3800HUMA1B1C   DS3800HUMA1B1C

GENERAL ELECTRIC DS3800HUMA1B1C MEMORY BOARD

GENERAL ELECTRIC DS3800HUMA1B1C HUMA WITH ROMS MODULE

GENERAL ELECTRIC DS3800HUMA1B1C 6BA03 MEMORY BOARD DS3800HUMA1B1C6BA03

GENERAL ELECTRIC DS3800HUMA1B1C 6BA03 MEMORY BOARD DS3800HUMA1B1C6BA03

GENERAL ELECTRIC DS3800HUMA1B1C 6BA03 BOARD DS3800HUMA1B1C

GENERAL ELECTRIC DS3800HSQDF1C CIRCUIT BOARD **

General Electric DS3800HSQD1J1G1F RepBoard With DS3800DSQD1A1A - Refurbished

GENERAL ELECTRIC DS3800HSQD1J1G W/ DS3800DSQD1A1A CIRCUIT BOARD **

GENERAL ELECTRIC DS3800HSQD1J1G   DS3800HSQD1J1G

GENERAL ELECTRIC DS3800HSQD1J1G PC BOARD

GENERAL ELECTRIC DS3800HSQD1J1G CIRCUIT BOARD **

GENERAL ELECTRIC DS3800HSQD1J1F   DS3800HSQD1J1F

GENERAL ELECTRIC DS3800HSQD1J1E   DS3800HSQD1J1E

GENERAL ELECTRIC DS3800HSQD1J1C   DS3800HSQD1J1C

GENERAL ELECTRIC DS3800HSQD1H1E   DS3800HSQD1H1E

General Electric DS3800HSQD1H1E Circuit Board 6BA06 C-ESS -

GENERAL ELECTRIC DS3800HSQD1G1E SEQUENCE CARD

General Electric DS3800HSQD1G1E Circuit Board DS3800DSQD1A1A -

GENERAL ELECTRIC DS3800HSQD1G1E 6BA06 C-ESS SEQUENCE CARD DS3800DSQD1A1A

GENERAL ELECTRIC DS3800HSQD1G1D   DS3800HSQD1G1D

GENERAL ELECTRIC DS3800HSQD1G1C   DS3800HSQD1G1C

GENERAL ELECTRIC DS3800HSQD1F1D SEQUENCE CARD **

GENERAL ELECTRIC DS3800HSQD1E1B   DS3800HSQD1E1B

GENERAL ELECTRIC DS3800HSQD1E1B LOW HP SEQUENCE BOARD **

GENERAL ELECTRIC DS3800HSPC1D1F   DS3800HSPC1D1F

GENERAL ELECTRIC DS3800HSPC1D1F SPEED POSITION INPUT BOARD **

GENERAL ELECTRIC DS3800HSHB1F1C PC CIRCUIT BOARD **

GENERAL ELECTRIC DS3800HSHA1D1D CIRCUIT BOARD **

General Electric DS3800HSHA1D1D Circuit Board -

GENERAL ELECTRIC DS3800HSHA1B1A PC BOARD

GENERAL ELECTRIC DS3800HSDD1F1G PC BOARD SOLENOID DRIVER **

GENERAL ELECTRIC DS3800HSDD1D1F PC BOARD SOLENOID DRIVER **

GENERAL ELECTRIC DS3800HSDD   DS3800HSDD

GENERAL ELECTRIC DS3800HSCG-1E1F   DS3800HSCG1E1F

General Electric DS3800HSCG1E1F Input Module

GENERAL ELECTRIC DS3800HSCG1D1E   DS3800HSCG1D1E

GENERAL ELECTRIC DS3800HSCG1C1C   DS3800HSCG1C1C

GENERAL ELECTRIC DS3800HSCG     DS3800HSCG

GENERAL ELECTRIC DS3800HSCD1J1G   DS3800HSCD1J1G

GENERAL ELECTRIC DS3800HSCD1J1G    DS3800HSCD1J1G

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GENERAL ELECTRIC DS3800HSCD1J1G BOARD DS3800HSCD

GENERAL ELECTRIC DS3800HSCD1G1E   DS3800HSCD1G1E

General Electric DS3800HSCD1G1D Circuit Board -

GENERAL ELECTRIC DS3800HSCD1G   DS3800HSCD1G

GENERAL ELECTRIC DS3800HSCD1F1D   DS3800HSCD1F1D

GENERAL ELECTRIC DS3800HSCD1F1C   DS3800HSCD1F1C

GENERAL ELECTRIC DS3800HSCD   DS3800HSCD

GENERAL ELECTRIC DS3800HSCC1D1D   DS3800HSCC1D1D

GENERAL ELECTRIC DS3800HSCC1D1D INPUT MODULE **

GENERAL ELECTRIC DS3800HSCC1D   DS3800HSCC1D

GENERAL ELECTRIC DS3800HSCA1E1C   DS3800HSCA1E1C

GENERAL ELECTRIC DS3800HSCA1C1A   DS3800HSCA1C1A

GENERAL ELECTRIC DS3800HSCA1B1A   DS3800HSCA1B1A

GENERAL ELECTRIC DS3800HSCA   DS3800HSCA

GENERAL ELECTRIC DS3800HSAB1D1B    DS3800HSAB1D1B

GENERAL ELECTRIC DS3800HSAA1U1N   DS3800HSAA1U1N

GENERAL ELECTRIC DS3800HSAA1U1N PC BOARD **

GENERAL ELECTRIC DS3800HSAA1U1M   DS3800HSAA1U1M

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GENERAL ELECTRIC DS3800HSAA1T1L   DS3800HSAA1T1L

GENERAL ELECTRIC DS3800HS0D1J1G DS3800S0D1A1A

General Electric DS3800HS0D1H1E 6BA06 Circuit Board

General Electric DS3800HRTA1A1B Circuit Board - Refurbished

GENERAL ELECTRIC DS3800HRTA1A1A   DS3800HRTA1A1A

GENERAL ELECTRIC DS3800HRRB1D1D   DS3800HRRB1D1D

GENERAL ELECTRIC DS3800HRRB1D1D OUTPUT BOARD **

GENERAL ELECTRIC DS3800HRRB1D1D OUTPUT BOARD **

General Electric DS3800HRRB1D1D Output Board

GENERAL ELECTRIC DS3800HRRB1D1D    DS3800HRRB1D1D

GENERAL ELECTRIC DS3800HRRB1D1D     DS3800HRRB1D1D

GENERAL ELECTRIC DS3800HRRB1D1D 6BA07 BOARD

GENERAL ELECTRIC DS3800HRRB1C1B   DS3800HRRB1C1B

GENERAL ELECTRIC DS3800HRRB1B1A   DS3800HRRB1B1A

GENERAL ELECTRIC DS3800HRRB   DS3800HRRB

GENERAL ELECTRIC DS3800HRRA1D1A   DS3800HRRA1D1A

GENERAL ELECTRIC DS3800HRRA1C1   DS3800HRRA1C1

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GENERAL ELECTRIC DS3800HRMD1B1A   DS3800HRMD1B1A

GENERAL ELECTRIC DS3800HRMB1G1D   DS3800HRMB1G1D

GENERAL ELECTRIC DS3800HRIA1A1A   DS3800HRIA1A1A

GENERAL ELECTRIC DS3800HRIA1A1A BOARD *IN A *