... detect the outputs of an induction motor, we
can use this motor controller to control an induction machine.
• TMS320F243 DSP controller. This is manufactured by the Texas Instruments
Company ...
3.1. The basiccontrol format
In essence, we are endeavoring to design a controller that can vary the torque induced in
the rotor of the motor. To do this, the induction motor controller ... Roberts
4. The Induction Machine
4.1 The fundamental operating principles for an induction
motor
An induction motor is an asynchronous AC (alternating current) motor. The least
expensive...
... signal-conditioning circuitry into a single
package.
In most motorcontrol systems, several sensors are
used to provide feedback information on the motor.
These sensors are used in the control loop ... conditions that
may damage the motor. As an example, Figure 1 pro-
vides a block diagram of a DC motorcontrol system to
show the sensor feedback provided for a typical motor
control.
A list of the sensors ... efect tachometer
• Back EMF/Sensorless control method
FIGURE 1: Typical DC Motor Block Diagram.
Author: Jim Lepkowski
Microchip Technology Inc.
Power Management
Input
Microcontroller
Driver
Motor
Feedback
Torque
Speed
Direction
Current
Sensor
Sensors
*...
... or nonsinusoidal back emf waveforms.
Machines with sinusoidal back emfs may be controlled so as to achieve nearly con-
stant torque; however, machines with a nonsinusoidal back emf may be less ... structure of the controls
Figure 14.1-1. Permanent-magnet acmotor drive.
Electrical
System
Command
Signal
Power
Converter
Control
PM
AM
Mechanical
System
Sensors
566 PERMANENT-MAGNET ACMOTOR DRIVES
... particular, eventually, the
back emf of the machine will rise to the point where the inverter cannot achieve the
current command due to the fact that the back emf of the machine becomes too large....
... ; Wait for Drive On, wait Tacq, set ADC GO
btfss DriveOnFlag ; is Drive active?
return ; no - remain in current STATE
call Tacq ; motor Drive is active - wait ADC Tacq time
bsf ADCON0,GO ; start ... Notes: Sensorless brushless motorcontrol *
; *
; Closed loop 3 phase brushless DC motor control. *
; Two potentiometers control operation. One potentiometer (A0) *
; controls PWM (voltage) and ... 3: THREE PHASE BRIDGE
To A
-V
M
+V
M
A High
control
A Low
control
To B
-V
M
+V
M
B High
control
B Low
control
To C
-V
M
+V
M
C High
control
C Low
control
AN857
DS00857A-page 42 2002 Microchip...
... electric motors.
Feeder Busway
Motor Control Center
Switchboard
Panelboard
Transformer
Panelboard
480 VAC
480 VAC
480 VAC
120 VAC
480 VAC
480 VAC
From Utility
Outdoor
Feeder
Busway
Basic MotorControl ... 47
Combination MotorControl Units
Motorcontrol centers principally contain combination motor
control units. A combination motorcontrol unit takes all the
elements required to control an ACmotor ... type of ACmotor control, involves
turning the motor on and off. This is often accomplished using a
motor starter made up of a contactor and an overload relay.
The contactor’s contacts are...
... 4.7K
U6A
74HC86
1
2
3
U6D
74HC86
12
13
11
U6C
74HC86
9
10
8
R10
10K
C15
0.001uF
C14
0.001uF
R11
10K
U27A
74HC14
1
2
U27B
74HC14
3
4
U27D
74HC14
9
8
U27C
74HC14
5
6
U27F
74HC14
13
12
U27E
74HC14
11
10
Tach Input A
Tach Input B
Tach Input A
Tach Input B
L. MotorR. Motor
Proportional term
Simple proportional coefficient Kp is multiplied ... speed control
Reasons for accurate speed control
Motor speed should
be independent of
load.
Differential drive
platforms need to
synchronize wheel
speed to go in a
straight line.
Motor control ...
a step response for
our PID controller?
Control systems
What is a control system?
What are some examples?
What are the types of control systems?
How are control systems represented?
PID...
... immunity.
Product highlights
17
Control
supply
AC switch
M
Microcontroller
Direct-reverse speed induction motor drive
AC switch
M
Control
supply
Microcontroller
Multi-winding on/off induction motor drive
The ... low-cost circuit is popular for low-power
and intermittent-use equipment.
➤
M
AC switch
Current
sensing
Microcontroller
AC universal motor drive
DC universal motor drive
Voltage
7
Universal motor
➤
➤
➤
IGBT
Diode
Rectifier
bridge
M
Power ... is connected to the mains through an AC switch. The AC voltage varies across the motor in phase control mode
by means of a microcontroller which sets the triac triggering time.
Main applications
■
Food...
... character is a backslash
or, with dpic, if the backslash is followed immediately by the # character. A blank after the
backslash, for example, produces a pic error.
12. Scaling: Pic and these macros ... The macro
switch(,,,D) is a wrapper for the comprehensive dswitch macro.
draws two diodes to the right, but the second one points left. Similarly, the macro
resized(factor,‘macro name’,macro ... with macro names is required, then one possibility is
to replace the strings by macros to be expanded by L
A
T
E
X, for example the diagram
.PS
box "\stringA"
.PE
with the LaTeX macro
\newcommand{\stringA}{
Circuit...