Siemens SIMOTICS S-1FT7 User Manual

Appendix
A.1 Glossary
S-1FT7 synchronous motors
402 Configuration Manual, 09/2018, A5E45099423B AA
Optimum speed n
opt
Speed at the optimum operating point.
If the optimum speed is above the rated speed, the rated speed is stated here.
Optimum power P
opt
Power achieved at the optimum speed.
The rated speed is the optimum speed (see optimum speed), the optimum power
corresponds to the rated power.
Number of poles 2p
Number of magnetic north and south poles on the rotor. p is the number of pole pairs.
Voltage constant k
E
(value at 20° C rotor temperature)
Rms value of the induced motor voltage at a speed of 1000 rpm and a rotor temperature of
20 °C.
Static torque M
0
Thermal limit torque at motor standstill corresponding to a utilization according to 100 K or
60 K. M
0
is always higher than the rated torque M
N
.
Stall current I
0
Motor phase current for generating the particular static torque ( M
0
= k
T
• I
0
). Specification of
the RMS value of a sinusoidal current.
Thermal time constant T
th
Defines the increase in the motor frame temperature when the motor load is suddenly
increased (step function) to the permissible S1 torque. If the power loss were constant, the
motor would have reached 63% of its final temperature after T
th
.
Moment of inertia J
Mot
Moment of inertia of rotating motor parts. J
Mot
= without brake, J
MotBr
= with brake.
Shaft torsional stiffness c
t Mot
This specifies the shaft torsional stiffness from the center of the rotor laminated core to the
center of the shaft extension, c
t Mot
= without brake, c
t MotBr
= with brake.
Winding resistance R
Str
at 20 °C winding temperature
The resistance of a phase at a winding temperature of 20°C is specified. The winding is in a
star connection.

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English