
34
Curtis 1230 Manual,
Rev. C
MOTOR CONTROL PARAMETERS
The 1230 controls the motor using a combined V/f and slip control algorithm,
which is summarized in Figure 15.
Fig. 15
Overview of motor control algorithm.
The V/f characteristic increases the motor voltage proportional to the motor
speed. The V/f profile is normally adjusted to achieve a constant no-load flux
in the motor, which means that the no-load motor current is more or less
constant over the whole speed range.
The slip control mechanism takes the throttle request (scaled to the motor
speed) and compares it with the actual motor speed (measured by means of the
speed encoder). The error output is fed into a standard PI control algorithm
that controls the slip frequency and slip voltage. Slip voltage is proportional to
the slip frequency to compensate for voltage drop across the motor resistance
caused by motor current. As the voltage drop is different during acceleration
and regeneration, two independent parameters, Max Accel Slip Voltage and
Max Regen Slip Voltage, are used to adjust the maximum slip voltage and the
resulting maximum motor currents.
3 — PROGRAMMABLE PARAMETERS:
Motor Control Parameters
+
×
+
+
-
f
sync
f
slip
f
sync
V
min
V
nom
V
sync
f
nom
Nominal Motor Voltage
Min. Motor Voltage
Nominal Motor Freq.
Vsync
f
sync
V
slip
f
slip
Max Accel Slip V
Max Regen Slip V
Max Slip
V
slip
V
motor
Mod. index
Number of motor poles
Encoder pulses per rev.
0
1
0
0
P Gain
I Gain
PI Control
Throttle request
Encoder Pulses
Speed Measurement
f
nom
1
Accel Compensation
Regen Compensation
f
sync
f
slip
Pull Out Slip
Slip Boost
Motor Frequency
Motor Voltage
0
Field Weakening
Содержание MultiMode 1230
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