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Motor limits
The speed and power of induction motors are limited for thermal and mechanical
1)
Limitation
Thermal limiting
Mechanical limiting
4.1
Technical data and characteristics
Table 4-1
Abbreviation
n
N
P
N
M
N
I
N
U
N
f
N
n
2
n
max
T
th
I
μ
I
max
1PM6/1PM4 Hollow-Shaft Motors for Main Spindle Drives
Configuration Manual, PPMS, 04/2008, 6SN1197-0AD23-0BP0
stress on the shaft end, bearing stress
Explanation of the abbreviations used
Units
1/min (rpm)
kW
Nm
A
V
Hz
1/min (rpm)
1/min (rpm)
min
A
A
Description
The characteristics for continuous duty S1 and intermittent operation
S6-60 %, S6-40 % and S6-25 % describe the permissible power
values for an ambient temperature of up to 40 °C. A winding
temperature rise of approx. 105 K can occur.
The motor must not exceed the mechanical limit speed n
Description
Rated speed
Rated power
Rated torque
Rated current
Rated voltage
Rated frequency
Speed for field weakening with constant power
Maximum rotational speed
Thermal time constant
No-load current
Maximum current
Technical data and characteristics
4.1 Technical data and characteristics
reasons.
1)
.
max
57
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