NTC protection circuit three-phase asynchronous motors

  
Semiconductor thermistor embedded thermal protection element belongs, it is sensitive to temperature,
NTC protection circuit three-phase asynchronous motors - schematic

temperature error of 5 . Its reliability , small size (diameter 3. Smm), easy to install, easy to embed winding, use it as a temperature sensing element can effectively reflect the electrical winding temperatures motivation. Thermistor on the three-phase stator windings, close to the wire, with epoxy cement. Thermal resistance has a negative temperature coefficient thermistor (NTC) and positive temperature coefficient thermistor (PTC) of the points. Circuit shown in Figure 4-1. Wherein Figure 4-1 (b), (c) only one shown protection circuits, the main circuit not shown. They are a switch circuit consisting of a single tube amplifier. Thermistor brother. , R. . , R. , The choice RRC6 type or MF-15 type (lokfl, 20 ), this thermistor in about lkfl 100 when, 110 at about 0.6k, Cl.




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