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09.00
Maximum torque
Torque, which is generated at the maximum permissible current.
M
max
The maximum torque is available for fast, dynamic operations.
The maximum torque is limited by the control parameters. The rotor will be de–
magnetized if the current is further increased.
Typical
M/I characteristic
Fig. 1-5
The individual characteristics of the individual 1FT5/6 and 1FK6 motors are
combined to form "typical shaft height ranges". The lefthand characteristic can
be considered as the "best case" and the righthand as "worst case".
Torque constant k
Quotient of the stall torque and stall current. k
T
up to approx. 2 < M
Important
!
These constants are not valid (motor losses) when calculatig the neces-
sary rated and accelerating currents.
Further, the steady–state load and the friction torques must be included
in the calculation.
Voltage constant
Value of the induced motor voltage at a speed of 1000 RPM. The phase–to–
k
phase motor terminal voltage is specified.
E
Siemens AG 2000 All rights reserved
SIMODRIVE Planning Guide Motors (PJM) – 11.00 Edition
M
M
0
4
3
2
1
2
1
Typical current–torque characteristic for various shaft heights for non–ventila-
ted motors
.
0
6SN1197–0AA20
General Information on AC Servomotors
1.1 Definitions
Shaft heights
28
63
36
71
100
48
80
132
3
4
5
6
= M
/I
. The constants are valid
T
0
0
ALS
7
I
I
0
ALS/1-9
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