5-4 General Notes on Technical Data Synchronous Motors MKD
19.05.2004 Version7.0 DOK-MOTOR*-MKD*******-PR07-EN-P
Mechanical parameters
Maximum permissible speed of the motor. Limiting factors can have
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
of I
max
(guaranteed value which, owing to production tolerances, may be
higher by 20%). The achievable maximum torque depends on the drive
controller used. Only the maximum torque M
max
specified in the selection
lists for the motor-controller combination are binding.
Moment of inertia of the rotor without the optional holding brake. Unit
(kgm²).
Motor mass without the optional holding brake and optional motor
blower, specified in kg.
Time of the temperature rise to 63% of the final temperature of the motor
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.
0%
63%
100%
t/min
Θ
max
T
th
1
~ 5x T
th
Θ
ttherm.fh7
(1): Course of the motor housing temperature over time
Θ
max
: Highest temperature (motor housing)
T
th
: Thermal time constant
Fig. 5-3: Thermal time constant
Maximum speed n
max
Theoretical maximum torque
M
max
Moment of inertia of the rotor J
M)
Mass m
M
Thermal time constant T
th
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