Specifications

Design Ver. 0002 DS - 5
The typical values for t
AC
, t
P
, and t
C
in machine-tool cycle are:
Calculation of the motor peak torque (M
PEAK
)
The required maximum torque is the sum of the Friction, Weight and Acceleration torques:
For a given acceleration time, we will need specific acceleration torque and maximum torque.
The motor must be able to provide a Peak Torque equal to or greater than the calculated
maximum torque.
Verify that the motor chosen in previous selections meets the following condition:
Peak torque equal to or greater than the calculated maximum torque: M
PEAK
> M
MAX
Rated torque equal to or greater than the calculated RMS value: M
RATED
> M
RMS
Summary of the three pre-selections:
Maximum speed equal to or greater than calculated value ( RPM
MOTOR
)
Stall torque equal to or greater than calculated continuous value ( M
CONTINUOUS
)
Motor inertia equal to or greater than inertia: ( J
LOAD
/ K )
Peak torque equal to or greater than calculated value ( M
MAX
)
Rated torque equal to or greater than calculated RMS value ( M
RMS
)
DS.1.4 DRIVE SELECTION
Once the motor has been selected, check the tables on electrical characteristics at the
chapter SM. There are several drives available for each motor and the peak torque obtained
with each one of them will be different. A drive has to be chosen whose peak current is greater
than the one calculated for the application.
t
T
C
= 06.
t
T
P
= 04.
t
T
AC
≅ 0
MMMM
MAX F W AC
=++
M
t
AC
t
P
t
C
t
AC
t
T
t
S