Vista Sensors and Motors.pdf - 第27页
SENSORS AND MOTORS MOTORS Chapter Issue 1 Sep 02 Technical Reference Manual 20.27 Figure 20-27 DC Motor Schematic Machine Controller I/O Breakout Board C T ransport Belts USC Paper Feed NOTE The CAN Bus forms part of the…
SENSORS AND MOTORS
MOTORS
20.26 Technical Reference Manual Chapter Issue 1 Sep 02
Feedback Position feedback is provided by an optical incremental encoder which is an
integral part of the servo motor.
The encoder is basically a glass disk attached to the motor shaft with a mirrored
finish into which, dependent on type, 500 or 1000 lines have been etched.
Bi-directional motion is sensed via two channels, 90° out of phase. The
NextMove card interprets these channels, quadruplicating resulting in 2000 or
4000 counts per encoder revolution, (Encoder figure refers).
DC Motor A simple moving coil motor is used in the following functions:
• Transport Belts
• USC Paper Feed
Figure 20-26 DC Motor System Basic Layout
Machine PC
NextMove
+/- 24V PWM
MultiMove
Control Enclosure
DC
Motor
SENSORS AND MOTORS
MOTORS
Chapter Issue 1 Sep 02 Technical Reference Manual 20.27
Figure 20-27 DC Motor Schematic
Machine Controller
I/O Breakout Board
C
Transport Belts
USC Paper Feed
NOTE
The CAN Bus forms part of the 100 way connection
between the Machine PC and Controller enclosures
DC Motors
M
16 I/Ps, O/Ps
Multi-
Move
CAN Bus
X12
Host
Comms
Parallel
Printer
PCI Bus
ISA Bus
Machine PC
P.S.U.
HDD
Keyboard
Touchscreen
Camera
24v (U/S)
PCI 3
Vision
Card
Vision
P. C.
Adaptor
ISA 5
CDROM
FDD
P
r
o
c
e
s
s
o
r
ISA 3
Mouse
Lighting
Monitor
ISA 10
N
e
x
t
m
o
v
e
SENSORS AND MOTORS
MOTORS
20.28 Technical Reference Manual Chapter Issue 1 Sep 02
Motor Comparison
Stepper Servo DC Motor
Features Good for position or
speed control of high
precision but unsuitable
for high speed or high
torque control
Enables positioning and
speed control at higher
torque
Fairly constant speed
rotation
Stability Stable Control must feature
some kind of damping
Unstable.
Unsuitable for precision
speed control as loading
slows down motor
Motor Simple 8 wire (4 phase)
stepper
More complicated (inte-
gral encoder) /expen-
sive
Simple moving coil
motor