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罗宾康高压变频器培训班培训资料(完全版)-PART2
单元串联型
POWER CELL B1
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POWER CELL A1
三相高压输入
POWER CELL C1 POWER CELL A2 POWER CELL B2 POWER CELL C2 POWER CELL A3
功率单元
单元控制板
POWER CELL 体式 变压器
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罗宾康高压变频技术的领导者
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电机调速的方法
电机调速基本公式: N = 60 f (1-s)/ p f = 电机供电频率 S = (n0-n)/n0 转差率 P = 电机极对数
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PWM波形图
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罗宾康高压变频技术的领导者
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罗宾康高压变频器原理
该变频器为单元串联,移相式PWM,电压源 型高压变频器,36脉波整流,13电平输出(相 电压,对6KV变频器而言)
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高压变频技术简介
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罗宾康高压变频技术的领导者
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PWM-电流源型输出波形
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罗宾康高压变频技术的领导者
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电力电子器件
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变频器的基本原理
• • • • • VVVF- 变压变频同时进行是电机正常运行的需要 E=4.44 f K N Ø F, 电机频率。 N- 每相绕组匝数 Ø- 电机气隙磁通
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PWM电流源结构
From SCR Converter Typical GTO/SGCT Snubber 缓冲电路
SERIES GTO's/ SGCT’s 3个6500V器件串联直接使用
INDUCTION MOTOR
From SCR Converter
Output Capacitors
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电力电子器件
二极管广泛应用与各种整流电路中。
二极管
晶闸管是一种半可控器件,只允许电流 在其中单方向流动。
SCR
三极管(BJT)是一种电流型控制型全控器件 ,可工作在截止,放大,完全导通三种状态。
三极管
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罗宾康高压变频器原理及结构
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单相变频器结构图
Q1 + 1 T2 2 + 3 Q2 Q4 T1 Power Output of Cell Q3 IGBTs Q1-Q4
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通用变频器的分类
• 按主回路结构形式: 1. 电流源型 2. 电压源型 按控制方式分: 1. U/F控制 2. 转差频率控制 3. 矢量控制 4. 直接转矩控制
•
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变频器基础
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罗宾康高压变频技术的领导者
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保持磁通恒定的必要性
• 电机在任何速度下都应保持磁通恒定。 • 磁通太强-电机励磁电流过大 • 磁通太弱-电机铁芯利用不充分,输出力矩下降。
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SPWM
• 调制信号为正弦波 • 载波信号为三角波 • 单极性调制,双极性调制。
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三电平输出电压波形
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电力电子器件
C
IGBT-绝缘栅型双极晶体管。是一种广泛应用 于变频器中的电压控制型全控器件,开关速度 高,电压,电流等级已超过BJT
G
E
IGBT
IGCT
IGCT(SGCT)门极换流晶闸管,是一种新 型的电力电子器件,其突出优点是反向耐 压高,通态电流大,开关速度高,在中点 钳位式三电平高压变频器中得到应用。
罗宾康高压变频技术的领导者
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三电平结构
y p i c a l S n u b b e r
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