Operating Modes Of The Motor - Lenze m850 Series Project Planning

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Operating modes of the motor

Operating modes of the motor
Operating modes S1 ... S10 as specified by EN 60034-1 describe the basic stress of an electrical
machine.
The most important operating modes
Continuous operation S1
P
P
V
J
Operation with a constant load until the motor reaches the thermal
steady state. The motor may be actuated continuously with its rated
power.
Intermittent operation S3
t
S
P
P
V
J
Sequence of identical duty cycles comprising operation with a constant
load and subsequent standstill. Start-up and braking processes do not
have an impact on the winding temperature. The steady-state is not
reached. The guide values apply to a cycle duration of 10 minutes. The
power increase depends on the cycle duration and on the load period/
downtime ratio.
P Power
t Time
t Idle time
L
ϑ Temperature
62
t
t
t
t t
L B
t
t
t
Short-time operation S2
t
B
P
P
V
J
Operation with constant load; however, the motor does not reach the
thermal steady state. During the following standstill, the motor winding
cools down to the ambient temperature again. The increase in power
depends on the load duration.
Non-intermittent periodic operation S6
t
S
P
t
P
V
J
Sequence of identical duty cycles comprising operation with a constant
load and subsequent no-load operation. The motor cools down during
the no-load phase. Start-up and braking processes do not have an
impact on the winding temperature. The steady-state is not reached. The
guide values apply to a cycle duration of 10 minutes. The power increase
depends on the cycle duration and on the load period/idle time ratio.
P Power loss
V
t Load period
B
t Cycle duration
S
t
t
t
t
L B
t
t
t