描述
轉(zhuǎn)差頻率控制
轉(zhuǎn)差頻率是施加于電動(dòng)機(jī)的交流電源頻率與電動(dòng)機(jī)速度的差頻率。根據(jù)異步電動(dòng)機(jī)穩(wěn)定數(shù)學(xué)模型可知,當(dāng)頻率一定時(shí),異步電動(dòng)機(jī)的電磁轉(zhuǎn)矩正比于轉(zhuǎn)差率,機(jī)械特性為直線(xiàn)。
轉(zhuǎn)差頻率控制就是通過(guò)控制轉(zhuǎn)差頻率來(lái)控制轉(zhuǎn)矩和電流。轉(zhuǎn)差頻率控制需要檢出電動(dòng)機(jī)的轉(zhuǎn)速,構(gòu)成速度閉環(huán),速度調(diào)節(jié)器的輸出為轉(zhuǎn)差頻率,然后以電動(dòng)機(jī)速度與轉(zhuǎn)差頻率之和作為變頻器的給定頻率。與U/f控制相比,其加減速特性和限制過(guò)電流的能力得到提高。另外,它有速度調(diào)節(jié)器,利用速度反饋構(gòu)成閉環(huán)控制,速度的靜態(tài)誤差小。然而要達(dá)到自動(dòng)控制系統(tǒng)穩(wěn)態(tài)控制,還達(dá)不到良好的動(dòng)態(tài)性能。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門(mén)子系列產(chǎn)品)》
⑥銷(xiāo)售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門(mén)子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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MANNESMANN REXROTH A2V-SL1000HS 0R5 GP PUMP,USED
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Rexroth Indramat Servo Drive Controller TDM3020300W0
Rexroth Proportional Valve 4WRE 6 W08-12/24K4/M New
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Rexroth Brushless Permanent Magnet Motor Pt#1070076709
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REXROTH R900568613 HYDRAULIC PUMP
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REXROTH Hydraulic Pump Power Unit 5 HP#6224SO4LR2
NEW Rexroth MKD071B-035-KG0?-KN MKD071B035KG0KN Motor
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New Rexroth Indramat MHD093B Servomotor
(3057-fc)Rexroth Hydraulic Pump Unit
BOSCH REXROTH TOUCHSCREEN DISPLAY SD301 0608830194 NEW
REXROTH,HDD02.2?-WO40N,A/C CONTROLLER
MINT Indramat Rexroth RD52.1-4N-001-L?-NN RD5214N001LNN
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Rexroth Variable Displacment 45cc Hydraulic Motor A10VM
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REXROTH LINEAR BEARING CARTRIDGES,P/N:R165341410
◥◣REXROTH INDRAMAT MAGNET MOTOR MKD025B-144-GG0?-KN◢◤
Expedited shipping available
HUGE LOT REXROTH HYDRAULIC DIRECTIONAL VALVES
Rexroth Indramat AC Servo Power supply TVM24050220 15 A
REXROTH FE25C20/LN9M USPP FE25C20LN9M
INDRAMAT REXROTH DAE1.1 DAE11 I/O CARD**XLNT**
REXROTH VT1600S3X1EES43?A81845 USPP VT1600S3X1EES43?A
REXROTH R416001186 NSPP R416001186
Rexroth Servo ECO Drive DKC06.3-040-FW
Rexroth#MNR:R900583910 Replaces Cannon#32-40-042
Bosch Rexroth Mill Type Cylinder R407999226
2139 Rexroth 1PV2V4 Variable Vane Hydraulic Pump