REXROTH MKD025A-144, Manual

Page: 36 / 184

5-2
General Notes on Technical Data Synchronous Motors MKD
19.05.2004 Version7.0 DOK-MOTOR*-MKD*******-PR07-EN-P
5.2 Operating Modes
Rexroth motors are documented according to the test criteria and
measuring methods of EN 60034-1. The characteristic curves specified
correspond to the operating modes S1 or S6.
t
D t
P
D t
V
T
C
t
P
Q
max
P
V
Q
P
Q
max
P
V
Q
Operating mode S6 Operating mode S1
betriebsart_en.fh7
P: Load
P
V
: Electric losses
Θ
: Temperature
Θ
max
: Highest temperature (motor housing)
t: Time
T
C
: Cycle duration
∆
t
P
: Operating time with constant load
∆
t
V
: Idle time
Fig. 5-1: Operating modes according to EN 60034-1: 1998
ON time
The operating mode S6 is supplemented by specification of the ON time
(ED) in %. The ON time is calculated with the following formula:
% 100
T
t
ED
C
P ⋅⋅⋅⋅ ====
∆
ED: Cyclic duration factor in %
T
C
: Cycle duration
∆
t
P
: Operating time with constant load
Fig. 5-2: Cyclic duration factor
The values specified in the documentation have been determined on the
basis of the following parameters:
Cycle duration: 15 min (MKD041, -071, -090, -112)
10 min (MKD025)
Cyclic duration factor (ED): 25%
Note: If applicable, conditions deviating therefrom are marked
accordingly.