8051 based dc motor speed control through push switches

Ngày tải lên: 25/01/2014, 13:20

... Đặc tính tải Thêm Radd nối tiếp cuộn dây phần ứng Example 1: Example 2: Example 3: Đặc tính động DC kích từ nối tiếp Example 4: Example 5: ...

Ngày tải lên: 17/12/2013, 14:15

... speed control method 38 4.3.2 Open Loop V/f speed control method using PI controller 42 4.3.3 Closed Loop V/f speed control method using PI controller 44 4.4 Vector Control ... e Simulation and Speed Control of Induction Motor Drives 2012 CHAPTER ANALYSIS OF VARIOUS METHODS FOR SPEED CONTROL OF IM The various methods of speed control of 3- Induction motor are as under: ... constant throughout the speed range This makes constant V/f method the most common speed control method of an induction motor 4.3.1 Closed Loop V/f speed control method The basis of constant V/f speed...

Ngày tải lên: 18/12/2013, 22:06

... difficulty of the flux control if it is used in the control scheme The steady-state speed is 30 mechanical rad/s and the dc- link voltage Vd, equals 33.94 V Since the speed is controlled a better ... inductance, motor speed, snubber circuit, and the amount of load torque If a BLDC motor has an ideal trapezoidal back-EMF having a 120 electrical degree flat top, one current sensor on the dclink ... two-phase switching states of the inverter voltage space vectors for a BLDC motor Usually the overall control system of a BLDC motor drive includes three hall-effect position sensors mounted on the...

Ngày tải lên: 03/01/2014, 19:44

... current control schemes for PWM inverters feeding BDCM have been studied and reported in the litterature, mainly: the hysteris controller and the linear controller [ 101 In the hysteresis current control ... Characterization ofthe studied motor IV CONTROL SCHEME FOR BDCM In this paper, two different control schemes are studied They are simulated using data corresponding to a motor with a very simple design ... performances can be obtained at low and medium speeds A high speed, the phase shift introduced by the t controller may become unacceptable A large bandwith controller is thus needed to minimize the...

Ngày tải lên: 03/01/2014, 19:44

... 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 Control of Brushless DC Motor ... 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 BLDC motor in [7] which is suitable ... 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 region by properly...

Ngày tải lên: 03/01/2014, 19:45

... FLUX CONTROL OF BRUSHLESS DC MOTOR TABLE I SWITCHING TABLE FOR DTC OF BLDC MOTOR USING THREE-PHASE CONDUCTION indirectly kept at its optimum level, while the motor speed is less than the base speed ... programming -based control of brushless motors,” IEEE Trans Control Syst Technol., vol 11, no 1, pp 139–146, Jan 2003 [19] S J Kang and S K Sul, “Direct torque control of brushless dc motor with ... 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 DC MOTOR...

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 ... FOUR-SWITCH DTC OF BLDC MOTOR DRIVE (CCW) (a) (b) (c) factors such as sampling time, dc- link voltage, hysteresis bandwidth, motor parameters especially the winding inductance, motor speed, snubber ... Time base: 16.07 ms/div (a) BLDC Motor Hysteresis Brake Position Encoder (b) Figure 10 Experimental test-bed (a) Four-switch inverter and DSP control unit (b) BLDC motor coupled to dynamometer...

Ngày tải lên: 03/01/2014, 19:46

... 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 and 3, the currents are controlled by current controllers in stationary ... comparison, a typical Vector Control scheme for synchronous motors (sine type machines) is depicted in Fig 1, followed by a typical Phase Current Control scheme for brushless DC motors (trapezoidal type ... currents * i generation q + − + − + − Current Controller Current Controller Current Controller INVERTER * va * vb * vc Load Hall sensors Position θe eq BLDC motor PWM Measured currents ed − ia ib =...

Ngày tải lên: 03/01/2014, 19:46

Ngày tải lên: 30/03/2014, 07:20

Ngày tải lên: 22/05/2014, 18:05

Ngày tải lên: 09/07/2014, 20:20

Ngày tải lên: 02/08/2015, 13:21

Ngày tải lên: 09/09/2015, 18:56

Ngày tải lên: 04/10/2015, 10:25

... be controlled” [16] The implications of this theorem are significant due to the fact that a complex system “…to be controlled has n variables [and therefore] the controller must be able to control ... system’s approach to cancer control can be highlighted by Ashby’s theorem of requisite variety that states that “…for effective control the variety available to the controller should be the same ... significant risk of leaving some subset of those variables uncontrolled” [16] The enormity of controlling all cancer variables, as looked at through Ashby’s theorem, can be seen in considering the...

Ngày tải lên: 26/10/2012, 10:04

... thành loại sau: + Động điện DC kích từ nam châm vĩnh cửu + Động điện DC kích từ độc lập + Động điện DC kích từ nối tiếp + Động điện DC kích thích song song + Động điện DC kích từ hỗn hợp (Gồm cuộn ... 330R Control GND ADT1 +12v D5 1N4007 GND Control Control 2 SIL1 CONN-SIL4 ADAPTER VCC Hình 4.15 Sơ đồ nguyên lý mạch công suất Nhược điểm lớn mạch cầu H dùng BJT công suất BJT thường nhỏ, với motor ... so sánh cho ADC - Chân 32 : AREF điện áp so sánh tín hiệu vào ADC - Chân 33 đến 40 : Cổng vào liệu song song A ( PORTA ) tích hợp chuyển đổi tín hiệu tương tự sang tín hiệu số ADC ( analog to...

Ngày tải lên: 23/04/2013, 14:48

... 12/2002 DC Motor - Speed Control PHƯƠNG PHÁP ĐIỀU CHỈNH TỐC ĐỘ ω= U ng Kφ − R f + Ru Kφ Rf I ω ω1 Rf1 ω2 Rf2 M Ung Rư,K, φ Mt M ω Rf Ung ω1 Ung1 ω2 M Ung2 Rư,K, φ Mt M By Lê Anh Tuấn 12/2002 DC Motor ... đổi Analog Filter V* + Bề rộng xung thay đổi By Lê Anh Tuấn 12/2002 DC Motor - PWM illustration By Lê Anh Tuấn 12/2002 DC Motor - Practical1 VI MẠCH 555/556 Tạo xung nhau, tần số f = 1.49 ( RA ... Tuấn 12/2002 DC Motor - Practical2 PWM SỬ DỤNG IC 555 Mạch dùng điều khiển động 6V, 0.5 A với đầu vào Vin=9V U1: tạo nhịp, tần số làm việc U2: Chu kỳ làm việc By Lê Anh Tuấn 12/2002 DC Motor - Practical3...

Ngày tải lên: 28/10/2013, 05:15

... to SWDC motors is that they not have precise speed control like PMDC and SHWDC motors have FIGURE 4: DC Voltage Supply SERIES-WOUND DC MOTORS Series Field Armature Brush PERMANENT MAGNET DC MOTORS ... Figure 5, CWDC motors employ both a series and a shunt field The performance of a CWDC motor is a combination of SWDC and SHWDC motors CWDC motors have higher torque than a SHWDC motor while ... electric motor types (i.e., brushless DC, AC induction), BDC motors not require a controller to switch current in the motor windings Instead, the commutation of the windings of a BDC motor is...

Ngày tải lên: 22/12/2013, 14:15

... describes how the various control algorithms can be realized on a digital computer or a microcontroller Finally, Chapter describes a complete microcontroller -based temperature control system The system ... microcontrollers 1.2 Microcontroller systems Microcontrollers are general purpose microprocessors which have additional parts that allow them to control external devices Basically, a microcontroller ... over a suitable bus structure 6 Microcontroller -based Temperature Monitoring and Control In-circuit programming In microcontroller development cycle, a microcontroller is normally removed from...

Ngày tải lên: 22/12/2013, 21:15