MNALAZIN-02
15
Products and System Requirements / System Requirements
Motor Specifications
AZ analog servo drives have a given current and voltage rating unique to each drive. Based on
the necessary application requirements and the information from the datasheet of the motor
being used, an AZ drive may be selected that will best suit the motor capabilities. Some general
guidelines that are useful when pairing an AZ servo drive with a motor:
•
The
motor
current
I
M
is the required motor current in amps DC, and is related to the
torque needed to move the load by the following equation:
I
M
Torque
K
T
-------------------
=
Where:
K
T
‐motor torque constant
The motor current will need to be calculated for both continuous and peak operation. The
peak torque will be during the acceleration portion of the move profile. The continuous
torque is the average torque required by the system during the move profile, including
dwell times.
•
The system voltage requirement is based on the motor properties and how fast and hard
the motor is driven. The system voltage requirement is equal to the
motor
voltage
,
V
M
,
required to achieve the move profile.
V
M
K
E
S
M
⋅
(
)
I
M
R
M
⋅
(
)
+
=
Where:
K
E
‐motor back EMF constant
S
M
‐motor speed (use the maximum speed expected for the application)
I
M
‐motor current (use the maximum current expected for the application)
R
M
‐motor line‐to‐line resistance
•
The motor inductance is vital to the operation of AZ servo drives, as it ensures that the DC
motor current is properly filtered.
A motor that does not meet the rated minimum inductance value of the
AZ drive may damage the drive! If the motor inductance value is less
than the minimum required for the selected drive, use of an external filter
card is necessary.
A minimum motor inductance rating for each specific AZ drive can be found in the
datasheet. If the drive is operated below the maximum rated voltage, the minimum load
inductance requirement may be reduced.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com