vector drives direct torque controlled drives

... Bibliography 182 vii Summary Direct method of torque control is a major research area for control of speed and torque of AC machine drives The advantages of classical direct torque control (DTC) methods ... current vector is not directly controlled Current vector dynamics are studied for a dynamic condition in torque Using fundamental equations of the machine, it is shown how the current vector is ... Current error vector for a step in torque 138 4.45 Current limiting direct torque control control 138 4.46 Torque step with no limit on the flux error vector magnitude,...

Ngày tải lên: 16/09/2015, 17:13

... II DIRECT TORQUE CONTROL OF BLDC MOTOR DRIVES USING Two-PHASE GONDUCTION MODE The key issue in the DTG of a BLDG motor drive in the constant torque region is to estimate the electromagnetic torque ... as zero and only the torque error r is used depending on the error level of the actual torque from the reference torque If the reference torque is bigger than the actual torque, within the hysteresis ... conduction direct torque control (DTC) scheme for BLDC motor drives in the constant torque region A look-up table for the two-phase voltage selection is designed to provide faster torque response...

Ngày tải lên: 03/01/2014, 19:44

... ‘Position sensorless direct torque control of brushless DC motor based on back-EMF vector , ELECTROMOTION pp 128-138, 2009 [7] S B Ozturk and H A Toliyat, “Sensorless Direct Torque and Indirect Flux ... synchronous motor drives, ” IEEE Trans Power Electron., vol 12, no 3, pp 528 536, May 1997 [4] Y Liu, Z Q Zhu, and D Howe, Direct torque control of brushless dc drives with reduced torque ripple,” ... Principles of the Proposed Method Title Block Indirect torque control method of BLDC motor explained in [9] was extended to a direct torque and indirect flux control technique for six-switch inverter...

Ngày tải lên: 03/01/2014, 19:45

... Principles of the Proposed Method In this study, indirect torque control method of BLDC motor explained in [29] is extended to a direct torque and indirect flux control technique, which is suitable ... the voltage vectors directly from a simple look-up table depending on the outcome of hysteresis torque and indirect flux controllers, thus the overall control is much simpler and faster torque response ... DTC scheme for BLDC motor drives that is similar to the conventional DTC used for sinusoidal ac motors where both torque and flux OZTURK AND TOLIYAT: DIRECT TORQUE AND INDIRECT FLUX CONTROL OF BRUSHLESS...

Ngày tải lên: 03/01/2014, 19:46

... four-switch voltage vector topology for twophase conduction DTC of BLDC motor drives (a) V1(1000) vector, (b) V2(0010) vector, (c) V3(0110) vector, (d) V4(0100) vector, (e) V5(0001) vector, (f) V6(1001), ... 2048 pulses/revolution), therefore a good torque estimation can be obtained in (1) C Torque Control Strategies of the Uncontrolled Phase-c For direct torque control, Fig 3(g) and (h) are not applicable ... Phase-c torque Temc effect 0.2 0.4 0.6 Time (s) 0.8 Figure Simulated electromagnetic torque when just torque is controlled without flux control under 0.5 N·m load using actual back-EMFs (reference torque...

Ngày tải lên: 03/01/2014, 19:46

... four milestones of variable speed drives, namely: • • • • DC Motor Drives AC Drives, frequency control, PWM AC Drives, flux vector control, PWM AC Drives, Direct Torque Control 10 12 We examine ... No.1- Direct Torque Control Evolution of Direct Torque Control A DC machine is able to produce a torque that is: • Direct - the motor torque is proportional to the armature current: the torque ... are simulated - “Motor Model” • Closed-loop drive • Torque controlled INDIRECTLY Technical Guide No.1- Direct Torque Control Evolution of Direct Torque Control To emulate the magnetic operating...

Ngày tải lên: 28/12/2015, 14:04

... Motor Drives - A Review”, IEEE Tran on Ind Electronics, vol 43, no 2, April 1996, pp 321– 330 Yong Liu, Z Q Zhu and David Howe, Direct Torque Control of Brushless DC Drives With Reduced Torque ... of the proposed Pseudo -vector Control for BLDCM drives III PRINCIPLE OF PSEUDO -VECTOR CONTROL In the conventional square-wave phase current control (Fig 2), for a given torque command, the reference ... Control for 1537 BLDCM drives is reported in Fig in the order from top to bottom: (a) Motor speed, (b) Three phase currents, (c) Torque, (d) Zoomed current, (e) Zoomed torque The torque ripple is clearly...

Ngày tải lên: 03/01/2014, 19:46

... 165 6.6 Cogging Torque Minimization 169 National University of Singapore IV Table of Contents 6.6.1 6.6.2 6.7 Peak Cogging Torque 169 Peak Cogging Torque to Running Torque Ratio ... some retail drives in 5.25" the mid-to-late 1990s Now obsolete Standard platter size for the most 3.74 3.5" 3.0 3.5" common hard disk drives used in PCs High-end 10,000 RPM drives Laptop drives (2.5" ... running torque 153 Figure 5.42 Calculated running torque using ideal current waveform 154 Figure 5.43 Measured phase current waveform 154 Figure 5.44 Calculated running torque...

Ngày tải lên: 15/09/2015, 22:03

... VFD022CP4EA-21 VFD037CP4EA-21 VFD040CP4EA-21 VFD055CP4EA-21 VFD075CP4EA-21 Cỡ dây tối đa Cỡ dây tối thiểu Torque (±10%) AWG (8.4mm2) 14 AWG (2.1mm2) 14 AWG (2.1mm2) 12 AWG (2.1mm2) 10 AWG (5.3mm2) 10 AWG ... (13.3mm2) AWG (21.2mm2) AWG (8.4mm2) AWG (8.4mm2) AWG (13.3mm2) AWG (8.4mm2) AWG (8.4mm2) AWG (13.3mm2) Torque (±10%) M5 35kg-cm (30.4 lb-in.) (3.434Nm) Lắp đặt theo tiêu chuẩn UL phải sử dụng dây 600V, ... VFD300CP23A-21 VFD220CP43A-21 VFD300CP43A-21 VFD370CP43A-21 VFD220CP4EA-21 VFD300CP4EA-21 VFD370CP4EA-21 Torque (±10%) M8 80kg-cm (69.4 lb-in.) (7.85Nm) Lắp đặt theo tiêu chuẩn UL phải sử dụng dây 600V,...

Ngày tải lên: 05/12/2015, 23:37

... Providing feedback on ABB Drives manuals Your comments on our manuals are welcome Go to www.abb.com /drives and select Document Library – Manuals feedback form (LV AC drives) Introduction 11 Overview ... navigating to www.abb.com /drives and selecting Sales, Support and Service network Product training For information on ABB product training, navigate to www.abb.com /drives and select Training ... 05.06.2008 ABB Oy AC Drives P.O Box 184 FIN-00381 HELSINKI FINLAND Telephone +358 10 22 11 Telefax +358 10 22 22681 Internet www.abb.com ABB Inc Automation Technologies Drives & Motors 16250...

Ngày tải lên: 20/10/2013, 02:15

... generation within variable-speed drives A.C drives D.C drives Effect of loading The effects of harmonics Calculation of harmonics Individual drives D.C Individual drives A.C Systems Isolated ... circuits (logic modes) Unipolar switching Bipolar switching High-speed stepping L/R drives Chopper drives Bilevel drives Application notes Effect of inertia Resonance Special products Stepper/encoders ... operation Reference-frame generation Performance and applications Direct torque control D.C motor drive control Flux controller Torque controller Performance and applications Analysis of and set...

Ngày tải lên: 20/10/2013, 02:15

Ngày tải lên: 25/10/2013, 21:20

Ngày tải lên: 12/12/2013, 22:01

... Motor Drives 2012 Torque (N-m) Rotor Speed (rpm) Figure 4.6 Torque- Speed Characteristics with Starting Load Torque 1.5 Nm and Reference Speed 500 rpm Torque (N-m) Rotor Speed (rpm) Figure 4.7 Torque- Speed ... machine T Torque Developed by the motor sm Slip at maximum torque Tmax Maximum Torque Vd DC Link Voltage ωref Reference Speed IX | P a g e ωsl Slip Speed ωf Rotor Speed at Frequency f Yd Space Vector ... Speed at Frequency f Yd Space Vector in d-axis Yq Space Vector in q-axis Ya Space Vector of a-phase Yb Space Vector of b-phase Yc Space Vector of c-phase Vqs q-axis Stator Voltage with stationary...

Ngày tải lên: 18/12/2013, 22:06

Ngày tải lên: 23/12/2013, 18:15

Ngày tải lên: 03/01/2014, 19:45

... information If instantaneous torque control is desired, then the torque feedback must accurately reflect the developed instantaneous torque It can be directly measured by torque transducers, such ... inductances become 4.1 Torque estimation In the torque control scheme, the direct axis current i, is controlled at zero at all times Therefore, by assuming i, = 0, the torque equation, eqn 15, ... results o torque control with average estlmated f torque feedback Fig 10 microcomputer DC input c Phase currenl, A a Torque, Nrn h Speed, rad/s sinusoidal The developed torque contains torque ripples...

Ngày tải lên: 03/01/2014, 19:52

... Mounting Faces It is sometimes necessary to connect the motor directly to the equipment it drives In the following example a motor is connected directly to a gear box C-face The face, or the end, of ... equivalent long shaft motor Short shaft motors are intended for use only on direct coupled centrifugal pumps and other direct coupled loads where there will not be a side pull (overhung load) exerted ... 2010 Edition Electric Motors & Drives Technical Manual Through the initiative of: International Copper Association – South East...

Ngày tải lên: 12/01/2014, 10:43

Ngày tải lên: 25/01/2014, 02:20

... Iron Fig 2.14 insulation Laminated steel TORQUE AND FORCE 27 2.7 TORQUE AND FORCE Calculating these is quite more complex, since Maxwells equations not refer directly to them The most reasonable ... DC Machines 81 81 81 82 82 Line Controlled Rectiers 8.1 1- and 3-Phase circuits with diodes 8.2 One -Phase Full Wave Rectier 8.3 Three-phase Diode Rectiers 8.4 Controlled rectiers with Thyristors ... Thyristors 84 88 94 94 99 99 100 102 103 CONTENTS 8.5 8.6 8.7 One phase Controlled Rectiers 8.5.1 Inverter Mode Three-Phase Controlled Converters *Notes Inverters 9.1 1-phase Inverter 9.2 Three-phase...

Ngày tải lên: 25/01/2014, 13:20