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Speed for field weakening with constant power n
Maximum achievable speed at rated power corresponding to the specified operating mode
(duty type) according to IEC 60034-1.
The motor may not operate continuously at maximum speed n
cycle (duty cycle duration 10 minutes) is specified, the speed must be reduced as stated
below:
Thermal time constant T
The thermal time constant defines the temperature rise of the motor winding when the motor
load is suddenly increased (step increase) up to the permissible S1 torque. The motor has
reached 63% of its S1 final temperature after T
1PM6/1PM4 Hollow-Shaft Motors for Main Spindle Drives
Configuration Manual, PPMS, 04/2008, 6SN1197-0AD23-0BP0
Duty cycle for a 10-minute cycle
3 min
n
max
6 min
2/3 n
max
1 min
Standstill
th
2
.
th
Appendix
A.1 Description of terms
. Unless a different duty
max
93
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