Parker TM Series, Technical Manual

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84 - PVD 3622_GB_TM_January 2014.Docx
3.6.4. Motor cooling circuit drop pressure
The tab below describes the drop pressure at the water flow rate from the motor data:
Motor type Drop pressure @ nominal water flow
All TMW200 0.1 to 0.4 bar
Up to TMW304 0.1 to 0.4 bar
TMW305 to TMW306 0.2 to 0.8 bar
TMW306 to TMW30A 1 to 2 bar
Up to TMW406 0.1 to 0.4 bar
TMW407 to TMW408 0.2 to 1.5 bar
TMW409 to TMW40C 1 to 2.5 bar
Note : all motors drop pressure are checked before shipping.
3.6.5. Chiller selection
This section describes how to choose the chiller. The chiller is able to evacuate the
heat from the motor losses with the water circulation.
The motor losses (= power to evacuate by the chiller) depend on the efficiency and
motor power:
.Pn 1
ρ
1
Pc






 
With Pc : Power to evacuate by the chiller (kW)
Pn : Nominal motor power (kW)

: motor efficiency at nominal power (%)
Refer to the respective torque motor data sheet for nominal power, efficiency and
water flow.
Chiller pump must provide water flow through motor and pipe pressure drop. Inlet
temperature must be inferior to
25°C .
Example
Motor : TMW30ALN (see §3.2)
Nominal power = 135kW
Efficiency = 84.6%
Water flow = 35 l/min
.135 1
0.846
1
Pc






 
= 25 kW
So, the chiller must evacuate 25 kW and has a water flow of 35 l/min for a
TMW30ALN