... 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 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 the Proposed Four -Switch ... BLDC motor drive using four -switch inverter with
faster torque response due to the fact that the voltage space
vectors are directly controlled. Therefore, the direct torque
controlled four-switch...
... schematic diagram of a DCmotor is shown in Figure 6.
Figure 6. Schematic Diagram of a DCMotor
Mechatronics Kevin Craig
DC Motor / Tachometer Closed-Loop SpeedControl System 10
• ... root-locus domain.
Mechatronics Kevin Craig
DC Motor / Tachometer Closed-Loop SpeedControl System 24
Mechatronics
DC Motor / Tachometer Closed-Loop SpeedControl
System
1. Introduction
This ... Experiments
Mechatronics Kevin Craig
DC Motor / Tachometer Closed-Loop SpeedControl System 23
2. Physical System
A DCmotor converts direct-current (DC) electrical energy into rotational...
...
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,
fast torque ... 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 ... 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
2.1 Principles...
... force (EMF), position-sensorless
control, stator flux control, torque pulsation.
I. I
NTRODUCTION
T
HE permanent-magnet synchronous motor (PMSM) and
brushless dc (BLDC) motor drives are used extensively ... instantaneously
controlled by the torque controller using the integral variable
structure control (IVSC) and the space-vector PWM (SVPWM).
However, this technique increases the complexity of the control
system.
The ... INDIRECT FLUX CONTROL OF BRUSHLESS DCMOTOR 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 motorspeed is
less...
...
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 3
current controllers ... motor that is fed by square-wave
current and it is often called Brushless DCMotor
(BLDCM).
The main difference between two kinds of motors from
the control viewpoint resides on current control ... machine, Vector control,
Pseudo-vector control, Torque ripple minimization.
I. I
NTRODUCTION
A. Sine-wave PM Motor vs. Square-wave Motor: Vector Control
vs. Phase Current Control
With the...
...
reading
;**********************************************************************
;*
;* Main control loop
;*
Loop
call ReadADC ; get the speedcontrol from the ADC
incfsz ADC,w ; if ADC is 0xFF we’re at full speed - skip timer add
goto PWM ; add Timer0 to ADC for PWM
movf ... 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 ... the speedcontrol potentiometer
;* and start the next reading
;*
btfsc ADCON0,NOT_DONE ; is ADC ready?
return ; no - return
movf ADRESH,w ; get ADC result
bsf ADCON0,GO ; restart ADC
movwf ADC...
... loại AVR tốc độ cao, tích
hợp sẵn ADC 10 bit.
- AVR tích hợp sẵn LCD driver : Atmega169, 329.
- AVR có tích hợp SC (power stage controller): AT9 0PWM thường dùng trong các
ứng dụng ... thay vì nhập xuất dữ liệu.
- Chân 30 : AVCC cấp điện áp so sánh cho bộ ADC.
- Chân 32 : AREF điện áp so sánh tín hiệu vào ADC.
- Chân 33 đến 40 : Cổng vào ra dữ liệu song song A ( PORTA ) ngoài ... tín hiệu số ADC ( analog to digital
converter)
b. Vào ra của vi điều khiển
PORTA ( PA7 … PA0 ) : là các chân số 33 đến 40. Là cổng vào ra song song 8 bít
khi không dùng ở chế độ ADC. Bên trong...
... cổng.
VD3: Sử dụng thanh ghi CC 80C537, có thể đạt 5kHz.
DC Motor - PWM illustration
By Lê Anh Tuấn 12/2002
DC Motor - Brushless DC
Động cơ một chiều không chổi than không được cấp liên tục ... 12/2002
DC Motor - Practical2
PWM SỬ DỤNG IC 555
Mạch dùng điều khiển động cơ 6V, 0.5 A với đầu vào Vin=9V
U1: tạo nhịp, chính là tần số làm việc
U2: Chu kỳ làm việc
By Lê Anh Tuấn 12/2002
DC Motor ... ứng dụng
By Lê Anh Tuấn 12/2002
DC Motor - Practical3
PWM BẰNG VI ĐIỀU KHIỂN
By Lê Anh Tuấn 12/2002
VD1: Sử dụng hai timer T0,T2 của AT89C52
T0: chu kỳ của xung PWM
T2: thời gian xung làm việc
VD2:...
... drawback to SWDC motors is that they do not
have precise speedcontrol like PMDC and SHWDC
motors have.
FIGURE 4: SERIES-WOUND DC
MOTORS
Armature
Brush
Permanent
Magnet Poles
DC
Voltage
Supply
Armature
Brush
Shunt
Field
DC
Voltage
Supply
Armature
Brush
Series
Field
DC
Voltage
Supply
... electric motor types (i.e., brushless DC,
AC induction), BDC motors do not require a controller
to switch current in the motor windings. Instead, the
commutation of the windings of a BDC motor is ... generally more robust than PMDC motors.
FIGURE 3: SHUNT-WOUND DC
MOTORS
Series-Wound
Series-wound Brushed DC (SWDC) motors have the
field coil in series with the armature. These motors are
ideally suited...
...
Overview of Gas Springs
2
.
21369
.
2007
.
1
Speed Control
TM
«
SPC Gas Springs,
cushioned 2486.12.
FIBRO SPC Gas Springs Speed Control
TM
« are designed to
reduce or eliminate the ... caused by the increased return travel speed
in high speed presses (link drive presses).
SPC Gas Springs feature an integral return travel delay which
reduces the speed of the gas spring to 0.4 m/s ... 2
.
21370
.
2007
.
1
3
Speed Control
TM
«
SPC Gas Springs,
2486.12. cushioned
subject to alterations
Force in daN at Piston...
... 18
Contents
9715E Issue 2 DC Motors
2
Page
Introduction
DC motor range 3
DC motor selection
MKlll range 4
Which DC motor? 4
Standards and Environment
Enclosure 5
Insulation 5
Thermal Rating 5
Motor Cooling ... 13
9715E Issue 2 DC Motors
12
MKlll Range
General
The MKIII range of dc metric motors
provides exceptionally high outputs per
unit weight combined with complete
flexibility of speed control. MKIII ... see page 24
9715E 8/4/05 2:42 pm Page 25
9715E Issue 2 DC Motors
13
Brushwear derection system for MKlll DC motors
All the benefits of DC drives
with low maintenance
The Bull Electric Brushwear...