NTC phase asynchronous motor protection circuit

Posted on Mar 28, 2007

Semiconductor thermistor embedded thermal protection element belongs, it is sensitive to temperature, 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

NTC phase asynchronous motor protection circuit
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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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