Automotive motor thermal protectors, also known as overload devices or inherent motor protection, are crucial for preventing electric motors from overheating and potentially failing. They detect excessive temperature or current and shut down the motor to prevent damage. These protectors are designed to protect the motor’s internal components, such as windings and insulation, from damage caused by overheating.
To install a motor thermal protector correctly, ensure it’s placed in a location that accurately detects the motor’s temperature, typically near the windings or stator. Proper wiring is crucial, and the protection settings should be adjusted based on the motor’s design and the operating environment.
The Thermostat Switch KSD301 bimetallic disc operates in a Normally Open (št) configuration. This means the circuit is initially open (odklopljen) at normal temperatures. When the temperature rises to a predefined threshold, the bimetallic disc bends, closing the circuit and allowing current flow.
NC type is the “emergency brake” for safety protection, and NO type is the “temperature trigger” for intelligent control. The action logics of the two are complementary. The selection must strictly match the circuit function requirements (comprehensive).
The bimetallic strip is the “temperaturni senzor + actuator” integrated component of KSD301. Its disc-shaped structure design and alloy ratio directly determine the temperature control accuracy and reliability.
NTC (negativni temperaturni koeficient) temperature sensor is a temperature measuring element that uses the exponential decrease in the resistance of a thermistor as the temperature rises. Its core is a ceramic semiconductor made by sintering metal oxides (such as manganese, cobalt, in nikelj), and the temperature is inferred by measuring the change in resistance. The following are its core technical characteristics, aplikacije, and selection points:
V sodobni elektroniki se danes uporabljajo štirje glavni temperaturni senzorji: Negativni temperaturni koeficient (NTC) termistorji, Detektorji temperature odpornosti (RTD), termoelementi, In integrirano na osnovi polprevodnikov (Ic) senzorji.
Bakrena glava senzorja s klimatsko napravo je zaznavanje bakrene cevi, Hitro temperaturna prevodnost; Gumijasta glava se običajno uporablja za zaznavanje temperature okolice, Korozijska odpornost, velika zanesljivost.
Z uporabo napredne tehnologije zaznavanja, Temperaturo lahko merimo zelo natančno z zelo majhnim razponom napak, izpolnjevanje vašega povpraševanja po natančnem merjenju temperature.
Pri izbiri termistorja, potrebno je namreč celovito upoštevati številne ključne parametre in embalažo (Enkapsulacija z epoksi smolo, Enkapsulacija s steklenimi kroglicami, Enkapsulacija s tankim filmom, SMD enkapsulacija, Enkapsulacija sonde iz nerjavečega jekla, prevleka za brizganje). Naj vam povem podrobno:
Razpon upornosti termistorjev je širok, in upornost termistorjev NTC se lahko giblje od desetin do deset tisoč ohmov, in celo posebne naprave je mogoče prilagoditi glede na potrebe. Običajno uporabljene vrednosti upora so 2,5 Ω, 5Oh, 10Oh, itd., pogoste napake upora so ±15 %, ±20 %, ±30 %, itd. Obseg upornosti PTC termistorjev je običajno od 1KΩ do več sto KΩ.
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