Bosch rexroth MCL, Project Planning Manual

Page: 114 / 206

Fig. 9-7: Heating up and cooling down of an electrical machine
Heating up
ϑ
e
Final excess temperature in K
ϑ
a
Initial excess temperature in K
t Time in min
t
th
Thermal time constant in min (see motor data sheet)
Fig. 9-8: Heating (excessive temperature) of an electric machine
Final over temperature Since the final over temperature is proportional to the power loss, the expec‐
ted final over temperature ϑ
e
can be estimated according to:
P
ce
Continuous power loss or average power loss over cycle dura‐
tion in W (see chapter 11.4 "Determining the drive power" on
page 150 )
P
vN
Nominal power loss of the motor in W
ϑ
emax
Maximum final over temperature of the motor in K
F
eff
Effective force in N (from application)
F
dn
Continuous nominal force of motor in N (see motor data sheet)
Fig. 9-9: Expected final over temperature of the motor
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Application and construction instructions
MCL Ironless Linear Motors
Bosch Rexroth AG R911330592_Edition 06