REXROTH EcoDrive Cs Project Planning Manual page 130

8-8
Motors
Maximum speed n
Theoretical maximum torque
Moment of inertia of the rotor J
Mass m
Thermal time constant T
Mechanical parameters
Maximum permissible speed of the motor. Limiting factors can have
max
mechanical (centrifugal forces, bearing stress) or electrical (DC link
voltage) causes.
Maximum torque that can be output for approx. 400 ms at a peak current
M of I (guaranteed value which, owing to production tolerances, may be
max
max
higher by 20%). The achievable maximum torque depends on the drive
controller used. Only the maximum torques M
lists for the motor-controller combination are binding.
Moment of inertia of the rotor without the optional holding brake. Unit
M)
(kgm²).
Motor mass without the optional holding brake and optional motor fan,
M
specified in kg.
Time of the temperature rise to 63% of the final temperature of the motor
th
housing with the motor loaded with the permissible S1 continuous torque.
The thermal time constant is destined for the size of the motors and the
used method of cooling.
100%
63%
0%
(1): Course of the motor housing temperature over time
Θ
: Highest temperature (motor housing)
max
T : Thermal time constant
th
Fig. 5-3: Thermal time constant
Θ
~ 5x T th
Θ
max
T th
1
DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
Rexroth EcoDrive Cs Drives
specified in the selection
max
t/min
ttherm.fh7