Siemens HT-direct - Technical Design

Description, technical data
2.8 Technical design
A5E01083943A AB
32 Siemens AG Operating Instructions 2.02 1FW4
Mechanical time constant T
mech
The mechanical time constant T
mech
is obtained from the tangent at a theoretical ramp-up
function through the origin.
T
mech
= 3 x R
ph
x J
Mot
/k
T
2
[s]
J
mot
= Motor moment of inertia [kgm
2
]
R
ph.
= Phase resistance of the stator winding [Ohm]
k
T
= Torque constant [Nm/A]
Tolerance data
Data going beyond this are subject to a specific measuring accuracy
Table 2-5 Tolerance data in the motor list data
Motor list data Typical value Theoretical value
Static current I
0
±3% ±7.5%
Electrical time constant T
el
±5% ±10%
Torque constant k
T
±3% ±7.5%
Voltage constant k
E
±3% ±7.5%
Winding resistance R
ph.
±5% ±10%
Moment of inertia J
mot
±2% ±10%
Temperature specifications
The insulation of the motors is rated according to temperature class 155 (previously: F).
The generally permissible coolant temperatures of 25°C for water-cooled 1FW4 motors and
40°C for the forced-ventilated 1FW4 motors apply for all specifications. At higher coolant
temperatures, the derating factors must be taken into account. [ID 1148.00]
See also
Water-cooling (Page 34)
Air cooling (Page 37)
2.8 Technical design
Technical data
Table 2-6 Technical data of the standard version
Features Design/values
Type of motor Permanent-magnet synchronous motor
Magnet material Rare-earth magnet material