This chapter describes design principles that must be taken into account when designing the
system using the electric machine.
System design
Cooling and temperature measurement
Do not operate the electric machine without correctly dimensioned and operating cooling system.
Mount the electric machine in correct position, see Chapter
When you connect the cooling system make sure that the cooling liquid runs freely in and out from the electric machine
with the coolant ow equal or higher than rated.
The coolant temperature at the inlet of the electric machine must be lower or equal to the rated temperature.
See more detailed information about coolant connection bore speci cations, required coolant
liquid ow and other speci cations in the product data sheet. Rated values can be found from the
machine rating plate.
The electric machine has at least one PT100 temperature sensor in the windings. The amount of
the sensors depend on the options chosen. The temperature signal(s) can be read out from the
measurement connector of the machine.
You can connect one temperature signal to the temperature surveillance pin in the inverter (EC-
C1200) and make sure that the inverter has the machine temperature protection feature activated.
The maximum allowed winding temperature of the electric machine is shown in the rating plate
and in the data sheet.
The PT100 temperature sensor characteristics are: resistance 100 Ω in 0 ºC temperature, and the
resistance increases 0.385 Ω per each 1 ºC increase of temperature.
Inverter
The electric machine is intended to be powered and controlled with an inverter capable of
supplying three-phase alternating current and that is capable of controlling the electric machine.
The electric machine is not suitable for direct online use.
If the machine is driven with a inverter from supplier other than Danfoss Editron, the electric
machine performance may differ from rated values. The optimum performance of the electric
machine is obtained with Danfoss Editron inverters. These inverters are:
Compact and light.
Liquid cooled.
Tolerant to high mechanical vibration (10 G) and shock (50 G).
Efficient, efficiency > 98 %.
Reliable, no moving components.
Do not exceed the maximum rotation speed of the machine.
EM-PME375
4. Design principles
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Danfoss | Produced By: Danfoss Power Solutions | July 2019 | 17
Summary of Contents for EM-PME375 Series
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