4.1.8 Temperature sensors
One of the most important parameters for protecting a motor against overheating is the motor’s
temperature. The motor temperature should be monitored to prevent over-temperature and damage to the
motor winding.
4.1.8.1 Types of temperature sensors
Several types of sensors are well known and widely used in the industry:
Thermocouple
Thermistors
Resistance temperature detectors (RTDs)
4.1.8.1.1 Thermocouple
A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming an electrical
junction. A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect.
Note
The generated voltage by a thermocouple is not enough to be measured by analog inputs and require
an interface circuit (transducers) to increase the output voltage level.
4.1.8.1.2 Thermistors
PTC and NTC thermistors can be used as well, but NTC thermistors have the disadvantage that a wire
brake can be confused with low temperatures.
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