Bosch rexroth MBT, Manual

Page: 280 / 422

Q
T
1
, p
1
T
2
, p
2
Pv
Q Flow quantity
T
1
Coolant inlet temperature
T
2
Coolant outlet temperature
p
1
Inlet pressure
p
2
Outlet pressure
Fig. 9-2: Liquid-cooled component
Coolant temperature rise
ΔT Coolant temperature rise in K
T
2
Coolant outlet temperature in K
T
1
Coolant inlet temperature in K
Fig. 9-3: Coolant temperature rise in K
Pressure drop
Δp Pressure drop
p
1
Inlet pressure
p
2
Outlet pressure
Fig. 9-4: Pressure drop via flown through component
Flow rate
Coolant flow for compliance with
the specified motor torque
The required coolant flow for compliance with the specified motor torque is
specified in chapter "Technical data".
For this value, a temperature increase of 10 K in the coolant is applied.
The required coolant flow at deviating temperature increase and/or non-water
coolants is determined according to fig. 9-5 "Coolant flow required for remov‐
ing power loss." on page 268 and tab. 9-6 "Substance values of different
coolants at 20°C" on page 269 :
Q Rated coolant flow in l/min
P
V
Amount of power to be dissipated in W
c Specific heat capacity of the coolant in J / kg ⋅ K
ρ Density of the coolant in kg/m³
ΔT Coolant temperature rise in K
Fig. 9-5: Coolant flow required for removing power loss.
268/409
Application notes
MBT High Synchronous Torque Motors
Bosch Rexroth AG R911298798_Edition 08