Siemens SIMOTICS S-1FT7 User Manual

Appendix
A.1 Glossary
S-1FT7 synchronous motors
400 Configuration Manual, 09/2018, A5E45099423B AA
Torque constant k
T
(value for a 100 K average winding temperature rise)
Quotient obtained from the static torque and stall current.
Calculation:
k
T
= M
0 (100 K)
/ I
0(100 K)
The constant is valid up to approx. 2 ∙
M
0 (60 K
) for naturally cooled
motors
Note
This constant is not applicable when configu
ring the necessary rated and acceleration
currents (motor losses!).
The steady
-state load and the frictional torques must also be included in the calculation.
Electrical time constant T
el
Quotient obtained from the rotating field inductance and winding resistance. T
el
= L
D
/ R
Str
Maximum torque M
max
Torque that is generated at the maximum permissible current. The maximum torque is briefly
available for high-speed operations (dynamic response to quickly changing loads).
The maximum torque is limited by the closed-loop control parameters.
Maximum torque (limited by converter) M
max conv
The maximum torque that can be applied (temporarily) for operation on the recommended
motor module.
Max. current I
max
This current limit is only determined by the magnetic circuit. Even if this limit is only briefly
exceeded, it can result in the irreversible de-magnetization > 2 % of the magnetic material.
Specification of the RMS value of a sinusoidal current.
Maximum converter current I
max conv
RMS converter output current (per phase) that can be supplied temporarily by the
recommended motor module
Maximum permissible speed (mechanical) n
max
.
The maximum mechanically permissible speed is n
max mech
. It is defined by the centrifugal
forces and frictional forces in the bearing.

Siemens SIMOTICS S-1FT7 Specifications

General

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