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ACCURACY
25
CURRENT PROFILE OPTION
The options described in this section apply to a very small percentage of applications and
should not be specified unless required. The standard Sine-Cosine profile will provide
the best performance for most motors and applications.
The non-linear microstep size of a step motor can be offset by distorting the current
profile to compensate for the mechanical characteristics of the motor. Two options are
offered for step motors that cannot be adequately compensated or applications requiring
exceptional smoothness.
The first option is the 3rd Harmonic profile. This provides improvement for step motor
designs that exhibit distortions that are 3rd harmonic in nature. Centent Company will
assist in evaluating a motor for this option.
The second option is the Compensated Current Profile. A specific model of step motor is
run on a dynamometer to empirically generate the current profile necessary for even
microstep size. This provides maximum smoothness and accuracy but will not work well
with another model of step motor.
The CN0165 may be ordered with different current profiles in the same drive. The eight
selections (see Option Header, page
X
14
X
) may be any combination of current profiles and
step resolutions, provided the step resolutions are all selected from the same column of
the Resolution Options Table on page
X
14
X
.
MOTOR SPEED-TORQUE CURVES
The following speed-torque and speed-power curves were plotted using a Centent
CN0165 and various manufacturers' motors. Two sets of curves are plotted per motor.
One set was taken with a 54 VDC power supply voltage, the other with a 27 VDC power
supply voltage. The dynamometer’s moment of inertia was adjusted to be equivalent to
the motor’s moment of inertia. The test data was collected at 100 points between zero
and 10,000 full steps per second. The CN0165 was set to 10 microstep resolution and the
motors configured for high performance (parallel) operation.
The data set for 27 volts DC power supply is also representative of a series configured
motor run at 54 volts DC power supply. The solid line graph is the motor torque,
measured in ounce/inches. The dotted line graph is the mechanical power output of the
motor, measured in watts.
Содержание CN0165
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