state three methods of dc motor speed control

Ngày tải lên: 11/08/2014, 05:22

Ngày tải lên: 13/08/2014, 16:21

... B r e r v r B r I r F r B r v r e r B r I r F r Đặc tính cơ của động cơ DC kích từ nối tiếp Example 4: Example 5: Đặc tính cơ 4 phần tư...

Ngày tải lên: 17/12/2013, 14:15

Ngày tải lên: 18/12/2013, 22:06

Ngày tải lên: 03/01/2014, 19:44

Ngày tải lên: 03/01/2014, 19:44

... 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 Using Three- Phase Conduction ... proposed three- phase conduction DTC of BLDC motor drive with six-switch inverter scheme. Keywords: Brushless dc (BLDC) motor, sliding mode observer, direct torque control (DTC), stator flux control, ... 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 also operate in the field-weakening...

Ngày tải lên: 03/01/2014, 19:45

... AND P ARAMETERS OF THE BLDC M OTOR A PPENDIX II OZTURK AND TOLIYAT: DIRECT TORQUE AND INDIRECT FLUX CONTROL OF BRUSHLESS DC MOTOR 357 Fig. 7. Steady state and transient behavior of the experimental. ... applications of the proposed sensorless three- phase conduction DTC of BLDC motor drive scheme are verified through simulations and experimental results. Index Terms—Brushless dc (BLDC) motor, direct ... INDIRECT FLUX CONTROL OF BRUSHLESS DC MOTOR 355 TAB L E I S WITCHING T ABLE FOR DTC OF BLDC M OTOR U SING T HREE - PHASE C ONDUCTION indirectly kept at its optimum level, while the motor speed is less...

Ngày tải lên: 03/01/2014, 19:46

... only the torque is controlled without speed control, the time range of control system under transient state is selected short. The motor speeds up to a very large value if the motor is run longer ... effectiveness of the two-phase four-switch DTC of a BLDC motor drive in the constant torque region. II. T HE P ROPOSED FOUR - SWITCH D IRECT T ORQUE C ONTROL OF BLDC M OTOR D RIVE A. Principles of ... regulation are showed in Fig. 4 for four-switch DTC of BLDC motor drive. The overall block diagram of the closed-loop four- switch DTC scheme of a BLDC motor drive in the constant torque region is...

Ngày tải lên: 03/01/2014, 19:46

... A schematic diagram of a DC motor is shown in Figure 6. Figure 6. Schematic Diagram of a DC Motor Mechatronics Kevin Craig DC Motor / Tachometer Closed-Loop Speed Control System 10 ... such as high torque, speed controllability over a wide range, portability, well-behaved speed- torque characteristics, and adaptability to various types of control methods. DC motors are classified ... Furthermore, the control of AC actuators was a difficult task at that time. Today, AC motors are also widely used as servo-motors, employing modern methods of phase- voltage control and frequency control...

Ngày tải lên: 25/01/2014, 13:20

... development of the shipbuilding industry all the way. One of the examples of ship's automation is the three stages of main engine control, which denote hand control, central control and bridge control ... into the details of the three- stage M. E. control one by one. 1. Hand Control By the hand control, the function of the remote control maneuvering console is the same as that of an ordinary electrictelegraph. ... central control is to be realized from the centralized control room, whereas the bridge control may be termed as remote control and executed in the wheelhouse. The mentioned three stages of M.E. control...

Ngày tải lên: 28/10/2013, 08:15

... Illustration of various types of load torques. 2. SEPARATELY EXCITED DC MOTOR Excitation winding and armature winding of a separately excited DC motor are supplied from two independent DC power sources. ... enables examination of available speed control methods for a separately excited DC motor, that are beyond the scope here. As can be seen from the speed torque characteristic, speed slightly decreases, ... excitation current) and to the speed of rotation, through a constant determined with constructional features of the machine. Speed of rotation ω is the so-called angular speed of rotation in [rad/s]...

Ngày tải lên: 17/12/2013, 14:15

... main concern of the BLDCM because it limits this kind of motor from many applications. There are three main sources of torque production (and therefore of the torque ripple) in BLDCMs: cogging ... ripple in Square-wave 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 ... the same as of the conventional control system for BLDC motor (Fig. 2). The motor is fed by a PWM-controlled MOSFET inverter. As we can see in Figs. 2 and 3, the currents are controlled by...

Ngày tải lên: 03/01/2014, 19:46

... Parameter Setting of Analog Speed Controllers 3.1.2 Current controllers In most traditional DC drives, the driving torque T em is controlled by means of a minor (local) current control loop. ... designing the structure of the speed controller and setting the control parameters. In this chapter, an insight is given into traditional DC- drives with analog speed controllers, along with ... complexity of the open-loop and closed-loop transfer functions. Each of the transfer functions W P , W SC , W M , – , , , , 3.2 The impact of secondary dynamics on speed- controlled DC drives...

Ngày tải lên: 27/01/2014, 15:20

... management of treatment side effects with state of the art therapies throughout the continuum of cancer care. Goal: Ensure that citizens of the State of Tennessee (including diverse populations) ... caregiver, and health care professional awareness of palliation quality of life issues and options; and increase access to and utilization of palliation and pain control techniques. Objective ... Cancer Control Plan for 2009-2012 is a collaboration of professionals in healthcare, social work, higher education, government, non-profit agencies and citizens who have first-hand knowledge of...

Ngày tải lên: 14/02/2014, 22:20

... Phase2, Set ADC GO, RA3->ADC sOffsetRead equ sOffsetSetup+1 ; Wait for ADC nDONE, Read ADC->ADCOffset sVSetup equ sOffsetRead+1 ; Wait for Phase4, Drive On, wait 9 uSec, Set ADC GO sVIdle ... No Is PWMThreshold >0xFD? Set FullOnFlag Clear FullOnFlag State = VSetup Clear SpeedStatus Set ADC input to PWM Pot State = RPMSetup Is motor drive active ? Wait for ADC acquisition time Start ADC State = VRead SM4 SM5 SM3 State = VRead ? Yes No No Yes No Yes No Yes Is ... Setup ADC (bank1) movlw B’00001110’ ; ADC left justified, AN0 only movwf ADCON1 banksel ADCON0 ; setup ADC (bank0) movlw B’11000001’ ; ADC clock from int RC, AN0, ADC on movwf ADCON0 bsf ADCON0,GO...

Ngày tải lên: 30/03/2014, 07:20

... volume control  Electric drill speed control Reasons for accurate speed control  Motor speed should be independent of load.  Differential drive platforms need to synchronize wheel speed ... 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 SYSTEMS FOR ... control system GAIN INPUT PLANTSUM FEEDBACK OUTPUT = (INPUT – OUTPUT) X GAIN PID tuning (BLACK MAGIC METHODS)  Mathematical methods  Mathematical representation of the plant  Root locus methods ...

Ngày tải lên: 22/05/2014, 18:05

... the validity of the API (0.643) was somewhat smaller than that of the two questionnaires (0.710 and 0.711). Following the method of Hanley and Mc Neil [22], the validity of the three instruments ... practice? Which of the three instruments could best be used if no actometers are available? Although the validity of the three instruments appeared to be fair, and hence in fact none of the instru- ments ... patient of phys- ical activity. Another option could be to include the opin- ion of a direct partner of the patients in the reporting of daily activities. Conclusion To conclude, the results of this...

Ngày tải lên: 18/06/2014, 19:20

... understanding of the mechanism underlying speech motor control. However, there is a lack of literature in quantitative measures of motor control, which may potentially characterize the nature of the ... study of speech motor control in children with CP. The lack of this type of research on CP children may be due to the technical difficulty of managing movement artifacts due to head or trunk control ... conduct speech motor control ana- lysis in children with CP for several reasons. First, quan- titative measures of motor control are considerably more sensitive than conventional methods in determin- ing...

Ngày tải lên: 19/06/2014, 08:20