●
mechanical construction (rotating covers, a.s.o.)
●
The settings of drive and controller (e.g. switching frequency)
9.9
Thermal behavior
Power loss
The rated feed force of a synchronous linear motor can be achieved is mainly
determined by the power loss P
V
produced during the energy conversion
process. The power loss fully dissipates in form of heat. Due to the limited
permissible winding temperature it must not exceed a specific value.
The allowed winding temperature of the motors is 130 °C.
The total loss of synchronous linear motors are significantly defined by the
short-circuit loss of the primary part.
P
V
Total loss in W
P
VI
Short-circuit loss in W
I
Current in motor cable in A
R
12
Electrical resistance of the motor at 20 °C in Ohm (see Chapter
4 ”Technical data”)
f
T
Factor temperature-related resistance raise
ΔT
Temperature increase in K
α
20
Temperature coefficient of cupper in 1/K
Fig. 9-6:
Power loss of synchronous linear motors
When you determine the power loss according to
you
must take the temperature-related rise of the electrical resistance
into account. At a temperature rise of 100 K (from 20 °C up to
120 °C), for example, the electrical resistance goes up by the fac‐
tor f
T
= 1.39.
Thermal time constant
The temperature variation vs. the time is determined by the produced power
loss and the heat-dissipation and –storage capability of the motor. The heat-
dissipation and –storage capability of an electrical machine is (combined in
one variable) specified as the thermal time constant.
The following figure (Fig.
) shows a typical heating and cooling process of
an electrical machine. The thermal time constant is the period within which
63% of the final over temperature is reached.
Together with the duty cycle, the correlation to Fig.
and Fig.
used to define the operating modes, e.g. acc. to DIN EN 60034-1.
MCL Ironless Linear Motors
105/197
Application and construction instructions
R911330592_Edition 06 Bosch Rexroth AG
Summary of Contents for rexroth MCL
Page 1: ...MCL Ironless Linear Motors Project Planning Manual R911330592 Edition 06 ...
Page 16: ...8 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 52: ...44 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 57: ...MCL Ironless Linear Motors 49 197 Dimension sheets R911330592_Edition 06 Bosch Rexroth AG ...
Page 68: ...60 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 90: ...82 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 104: ...96 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 162: ...154 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 174: ...166 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 196: ...188 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 198: ...190 197 MCL Ironless Linear Motors Bosch Rexroth AG R911330592_Edition 06 ...
Page 204: ...Notes 196 197 MCL Ironless Linear Motors ...
