General purpose velocity feedback drivers have usually two
adjustments: tachometer gain and compensation (
Figure 5.52
).
Figure 5.52: DC Motor Tachometer Gain and Compensation
The tachometer gain is used to set the ratio between the control
voltage and the velocity. The compensation adjustment reduces the
bandwidth of the amplifier to avoid oscillations of the closed loop.
5.7.3.1 PWM
Drivers
M
T
E
V = velocity
control signal
±
10V
tach. gain
compensation
tachometer
gain
Even though linear amplifiers are simpler and cleaner (do not
generate noise), their low efficiency makes them impractical to be
used with medium and larger motors. The most common types of DC
drivers use some kind of PWM (
P
ulse-
W
idth
M
odulation) techniques
to control the current and/or voltage applied to the motor. This allows
for a more efficient and compact driver design.
5-38
Section
5
–
Motion
Control
Tutorial
Содержание ESP300 Series
Страница 1: ...ESP300 Motion Controller Driver User s Manual...
Страница 4: ...ESP300 1999 EU Declaration of Conformity iv Preface...
Страница 29: ...This page is intentionally left blank Section 2 Modes of Operation 1 15...
Страница 30: ......
Страница 230: ...4 16 Section 4 Advanced Capabilities...
Страница 274: ...This page is intentionally left blank 6 6 Section 6 Servo Tuning...
Страница 290: ...This page is intentionally left blank B 6 Appendix B Trouble Shooting and Maintenance...