Siemens 611 configurationmanual Cooling, Temp-F

Motor components of the built-in motor and options 3.3 Cooling

Temp–F

Temp–F supplies an analog signal that is proportional to the temperature and for a symmetrical current load of the three-phase windings provides information about the average motor temperature.

Note

The temperature sensor (Temp–F) only senses the winding temperature between two phases or in one phase in the stator. However, the phases in the synchronous motor are loaded to different degrees depending on the particular operating mode, so that in the worst case, the phases that have not been measured have the higher temperatures.

3.3Cooling

The heat loss generated by the stator winding must be dissipated by a water-cooling system. For this purpose, the machine manufacturer must connect the cooling duct to a cooling circuit in a heat-exchanger unit. For characteristic curves indicating a rise in temperature and drop in pressure of the cooling medium between the inlet and return flow circuit in the cooler as a function of the volume flow rate, see "Technical data and characteristics".

In certain operating statuses (e.g. at high speeds or in S1 mode), the rotor can heat up further due to iron loss. The rated motor torques specified in the data sheets (see "Technical data and characteristics") are valid during operation with water cooling with an inlet temperature of 35 °C and a rotor flange temperature of max. 60 °C. To ensure that these conditions are maintained, additional measures may have to be taken to cool the rotor.

NOTICE

If the heat from the rotor cannot be sufficiently dissipated via the flange, this can cause the rotor to heat up excessively in the upper speed range in S1 mode, which could demagnetize the magnets.

Note

Depending on the load and operating mode, the average temperature in the stator and rotor can reach 120°C. Different temperature conditions in the stator and rotor can cause the motor components to expand. The amount of heat transferred into the machine construction as well as the radial and axial thermal expansion of the motor must be taken into account in the design.

1FW6 Built-in torque motors	49
Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7