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The primary function of this tab is to define the parameters for the given motor that is to be connected to the Unidrive SP/
Digitax ST. Depending on whether the user selects Servo mode or Closed-loop Vector mode (Unidrive SP only), the motor
parameters on this tab will be very different. This is because servo motors and vector motors are very different in design and
operation.
Following is a description of all the different functions on the Motor Tab.
Use Motor Data From .ddf File Check Box
When selecting a motor for use with the drive and EZMotion, the user has two basic options:
1.
Use a motor that already exists in the standard motor file (SPStdMotor.ddf) or custom motor file (SPMotor.ddf).
2.
Create a custom motor that has not been used before.
When selecting option 1 from above (use an existing motor), the user simply selects one of the motors from the Motor Type list
at the top of the Drive/Encoder view. Once the user selects a motor from the Motor Type list, the data for that motor is read
from the pertinent .ddf file and then is displayed in the Motor Parameters column on the Motor tab (see Figure 59). The
parameters in this column will be dimmed and unavailable because the motor information comes directly from the .ddf file.
If the user wishes to edit one or more of the parameters read from the .ddf file, it is necessary to clear the "User Motor Data
From .ddf File" check box. Clearing the check box will break the "link" between the motor data displayed on this view, and the
motor data in the .ddf file. This is necessary because as soon as the user changes any of the values, it no longer matches the
.ddf file, and is now in effect a "custom motor". When the "User Motor Data From .ddf File" check box is cleared, all of the
values in the Motor Parameters column will become available, and the Motor Name will be changed to "New Motor" so that
there is no association with the existing motor that was previously selected. The user can now change any of the values as
desired and give the motor a new name. Once the values have been changed, the motor data only exists within the active
configuration. To save the new values into the .ddf file, the user must click the Save .ddf Values button on the right side of the
tab.
8.2.2
Motor Parameters Column
Motor Parameters column is a column of data displayed on the Motor tab within the Drive/Encoder view (See Figure 59). This
column of data contains the values for each of the motor data parameters. The values in this column are unavailable if the
"Use Motor Data From .ddf File" check box is selected. This means that since the data is associated with the .ddf file, it cannot
be changed. The values in this column become available when the "Use Motor Data From .ddf File" check box is cleared. The
user can then change one or more of the parameter values because there no longer linked to data in the .ddf file.
If the user does edit motor parameter values on this tab, then those values are only stored within that particular configuration
file. In order to save the values to the .ddf file, the user must click the "Save .ddf Values" button on the right side of the tab.
The parameters displayed in the Motor Parameters column will change depending on what is selected (Servo or Closed-loop
Vector) in the Drive mode list box on the Drive/Encoder view.
8.2.3
Servo Motors
When Servo is selected from the Drive mode list box or the application file is for a Digitax drive, the user must either select one
of the pre-configured servo motors from the Motor Type list or create a new servo motor data file by editing the Motor
Parameters column.
Following list of parameters and descriptions are necessary for configuration of a servo motor:
Motor Name
The motor name is limited to 12 characters and must begin with an alpha character (non-numeric character). This is the motor
name that will appear in the "Motor Type" list box on the Drive/Encoder view in PowerTools Pro.
Peak Current
Specifies the peak current allowed by the motor. The range is 0.00 to 9999.99 Amps (rms). The motor manufacturer typically
provides the peak current data.
If a system is "drive limited" (meaning that the motor can handle more current than the drive can deliver), the peak current
actually used by the system may be lower than the value specified here.
Continuous Current
Specifies the continuous current allowed by the motor. It is used to determine the Unidrive SP/Digitax ST continuous current
and peak current limits. The drive can also limit the continuous current to the motor based on the drive capacity. The range is
0.00 to 9999.99 Amps (rms). The motor manufacturer typically provides the continuous current data.
If a system is "drive limited" (meaning that the motor can handle more current than the drive can deliver), the continuous
current actually used by the system may be lower than the value specified here.
Motor Poles
Specifies the number of magnetic poles on the motor. The supported values are 4 to 120. The motor manufacturer typically
provides the motor pole information.
Rotor Inertia
This parameter specifies the inertia of the motor rotor. The range is 0.000010 to 90.000000 kg*m^2. The SM-EZMotion
module uses this parameter to interpret the "Inertia Ratio" parameter found on the Tuning view. "Inertia Ratio" is specified as a
ratio of reflected load inertia to motor inertia.
Motor Ke
Specifies the Ke of the motor. The units are Vrms/ kRPM. The line-to-line voltage will have this RMS value when the motor is
rotated at 1000 RPM. The range is 1.0 to 5000.0. The motor manufacturer will typically provide the Ke data.
EZMotion User/Programming Guide
Revision A8
www.controltechniques.com
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