h bridge circuit for dc motor control pdf

... values within the test range are plotted with respect to time.  The values which yield the best curve will be used for the PID controller. PID Closed loop control system  PID controls the gain ... Tuning  How is the response of the PID system tested and measured?  How is the response of the PID system optimized?  How are the coefficients for P, I, and D determined? DC MOTOR CONTROL ... measurement  The behavior of most systems is measured by the system’s “Step response”  How can we measure a step response for our PID controller? Control systems  What is a control system?  What...

Ngày tải lên: 22/05/2014, 18:05

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Ngày tải lên: 07/03/2014, 13:20

... switch the high side driver to keep the charge pump refreshed. Even though this application does not use the charge pump type drivers, we will modulate the high side driver while leaving the low ... kHz. There are several ways to modulate the motor drivers. We could switch the high and low side drivers together, or just the high or low driver while leaving the other driver on. Some high side ... to switch- ing, and the effect that the PWM rate has on the motor. Higher PWM frequencies mean higher switching losses, but too low of a PWM frequency will mean that the current to the motor will...

Ngày tải lên: 30/03/2014, 07:20

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Ngày tải lên: 03/01/2014, 19:44

... PM Motors (BLDC motor) . Instead of conventional square-wave form, the method uses the principle of vector control to optimally design the wave-form of reference current in such a way that the ... sinusoidal rotor flux. High- performance PM synchronous motor drives are regulated by the well-known vector control method, in which motor currents are controlled in synchronously rotating d-q ... still controlled in the phase current control manner. For this raison, we have called the proposed approach Pseudo-vector Control. II. S YSTEM C ONFIGURATION The configuration of the control...

Ngày tải lên: 03/01/2014, 19:46

... search path with the command path(path,p) or path(p,path) where p is some new directory, for example, containing functions written by the user. There is specially designed software available which ... directory. MATLAB checks for MATLAB files in certain directories which are controlled by the command ‘path’. The command ‘path’ lists the directories in MATLAB’s search path. A new directory can ... Athena, has an Athena account, and has little or no experience with MATLAB. Other MATLAB help is available through Athena consulting which offers a number of more tutorial handouts and short courses...

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Ngày tải lên: 03/01/2014, 19:44

... This study has successfully demonstrated application of the proposed three-phase conduction direct torque control (DTC) scheme for BLDC motor drives. It is shown that the BLDC motor could ... to the prior two-phase conduction methods, this DTC technique can control both torque and stator flux of the BLDC motor simultaneously, therefore field-weakening operation is possible. The ... illustrate the validity and effectiveness of the sensorless three-phase conduction DTC of a BLDC motor drive with six-switch inverter. 2. The Proposed Sensorless DTC of Four-Switch BLDC Motor Drive...

Ngày tải lên: 03/01/2014, 19:45

... algorithm in both meth- ods (two-phase and three-phase conduction) is the same due to the similar machine model in which the back EMF shape sepa- rates the two from each other, in two-phase conduction ... table technique more sophisticated PWM method is used to drive the BLDC motor. Also, two phase conduction method instead of a three-phase one is used which is problematic in the high speed applications. In ... position-sensorless three-phase conduction DTC scheme for BLDC motor drives that is similar to the conventional DTC used for sinusoidal ac motors where both torque and flux are controlled, simultaneously. This...

Ngày tải lên: 03/01/2014, 19:46

... production, which is shown in the simulations. Solution to the above phenomenon is explained in detail below: For BLDC motor with two-phase conduction, one of the phase torque should be zero as shown ... to control the flux amplitude. Second, with the two-phase conduction mode sudden sharp dips in the stator flux linkage locus occur that complicate the control scheme. The size of these sharp ... operation of the freewheeling diodes. The same phenomenon has been noticed when the DTC scheme for a BLDC motor is used, as shown in Fig. 2. Due to the sharp dips in the stator flux linkage...

Ngày tải lên: 03/01/2014, 19:46

... direction with the direction determined by the right-hand rule applied to the direction of the current). miA= ˆ The motor used in this system is the Honeywell 22VM51-020-5 DC Motor with Tachometer. ... DC Motor / Tachometer Closed-Loop Speed Control System 3 • Define Through and Across Variables The through variables for this system are the current i in the electrical circuit flowing through ... system, shown in Figure 2 and typical of commonly used motors; is a fractional- horsepower, permanent-magnet, DC motor in which the commutation is performed with brushes. The load on the motor...

Ngày tải lên: 25/01/2014, 13:20

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Ngày tải lên: 26/01/2014, 07:20

... the Joint Staff; and others who have helped us with this work. The individuals contributing their time to these interviews are listed in Appendix A. Our research has been a team effort with the ... follow how the general principles are used at lower and lower levels. This approach helps track how individual tasks align with the higher-level desired functionality, and also helps highlight redundancies and ... It defines the types of information exchanged, the frequency of exchange, which tasks and activities are supported by the information exchanges, and the na- ture of information exchanges in sufficient...

Ngày tải lên: 15/03/2014, 18:20

... pages of Hilton’s text and/or the readings. Refer to the Hilton pages listed in the Study Schedule and use the index at the back of the text. Also note that this text has a web site with supplementary ... of the above 18 Section 2 Study Guide Self-test questions When you have studied the references for this module you should attempt the following questions, the solutions to which are ... calculate his total manufacturing overhead for the month of August, but is unsure exactly what it is. He maintains an inventory of manufacturing supplies which he valued at $600 at the start...

Ngày tải lên: 22/03/2014, 13:20

... their pain. They think that they’ll distract their doctors from working on ways to help treat their cancer. Or they worry that they won’t be seen as “good” patients. They also worry that they ... question why this could happen to them. They wonder what they did to deserve it. Others may turn to religion or explore their spirituality more, asking for guidance and strength. 1 CHAPTER 1 What ... talk with oncology social workers, health psychologists, or other mental health experts at your hospital or clinic. Your health care team can help you find a counselor who is trained to help people...

Ngày tải lên: 22/03/2014, 16:21

... Popula- tion Health and Public Health Practice Study Staff Study Sponsors The Centers for Disease Control and Prevention The Department of Health and Human Services Office of Minority Health The Department ... exposed to hepatitis B virus (HBV) or hepatitis C virus (HCV) which cause hepatitis B and hepatitis C, respectively. The diseases can become chronic, although this does not always happen and, ... related to hepatitis B and hepatitis C. Hepatitis B and hepatitis C can be either acute or chronic. The acute form is a short-term illness that occurs within the first six months after a person...

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