Protettore termico del motore personalizzato (Interruttore termostatico)

Il protettore termico del motore è un dispositivo di protezione che interrompe automaticamente il circuito in caso di variazioni di temperatura o corrente. La funzione principale è impedire che il motore venga danneggiato dal surriscaldamento, sovraccarico o stallo. Di seguito i punti chiave:

Protezione da sovraccarico e surriscaldamento del motore del tergicristallo per auto 6AP

17Protezione termica motore AM Sensore termostato NC normalmente chiuso KLIXON 17AM022

Opzioni di protezione da sovraccarico termico per piccoli motori elettrici & Motoriduttori

⚙️ 1. Principio di funzionamento fondamentale
‌Struttura a strisce bimetalliche‌: È composto da due nastri metallici con diversi coefficienti di dilatazione termica. Quando la temperatura aumenta, the metal strips bend and deform due to the expansion difference, triggering the mechanical linkage to cut off the circuit; it automatically resets and resumes conduction after the temperature drops.
‌Current-temperature dual response‌: Alcuni modelli (such as three-phase thermal protectors) monitor current overload and winding temperature at the same time. When overloaded, the circuit is quickly cut off within 4-10 seconds to avoid stall damage.

Come funziona:
Overheating Detection:
Thermally protected motors typically use temperature sensors, such as PTC thermistors or KTY sensors, which are embedded within the motor windings. These sensors monitor the temperature of the motor and send signals to a thermal protection device.

Power Cutoff:
When the motor’s temperature rises beyond the safe limit, the thermal protection device, which can be a bimetallic switch or a similar mechanism, disconnects the power supply, shutting down the motor.

Automatic Restart:
After the motor cools down, the thermal protection device typically resets, allowing the motor to be restarted manually or automatically.

Vantaggi:
Prevents Damage:
Thermal protection helps prevent overheating, which can lead to damage to the motor’s insulation, windings, and other components.
Extends Lifespan:
Prevenendo il surriscaldamento, thermal protection contributes to a longer lifespan for the motor.
Sicurezza:
It minimizes the risk of fire or other hazards caused by motor overheating.

🔍 2. Main types and technological evolution

Tipo	‌Principio di lavoro	‌Caratteristiche	Scenari applicabili
Bimetallic thermal protector	Temperature-triggered metal sheet bending	Simple structure, basso costo, ripristino automatico, but accuracy is affected by material ratio	Household appliance motors, small industrial motors
Electronic protector	Chip detection current/temperature signal	Alta precisione, programmable protection curve, support remote monitoring, but requires a matching controller	Intelligent industrial equipment, precision motors
Three-phase thermal protector	Comprehensive current overload and overheating protection	Support 0.55kW-75kW motors, strong resistance to polluted environments, can replace the traditional “thermal relay + contactor” solution	Motori industriali, pompe sommergibili

Nota: Tianyin Electromechanical’s patented technology significantly improves response reliability by optimizing the combined structure of bimetallic strips (such as adding overcurrent protection components).

Protezione termica del motore elettrico con IP54 Tolleranza alla temperatura IP55 ± 5o C – Interruttore termico,

6Protezione da sovraccarico termico elettrico di alta qualità AP/3MP per motore frullatore

5Sovracorrente AP/2MP 50℃-180℃, protettore termico del motore contro il surriscaldamento

📌 3. Key selection parameters

Parametri‌	‌Requisiti‌	‌Base‌
Temperatura d'azione	40°C–170°C (customized according to motor insulation level)	Need to match the motor winding temperature limit
Corrente nominale	2A–20A (selected according to motor power)	Prevent false triggering or protection failure
Reset mode	Ripristino automatico/ripristino manuale	Automatic reset is suitable for refrigerators and fans; manual reset is used for high-risk scenarios
Certification standards	TS16949、UL、CE（EN 60730-2-2）	Mandatory safety and environmental protection requirements

⚠️ 4. Precauzioni per l'uso
‌Installation specifications‌:
The lead bending must be more than 6mm away from the root to avoid damage and poor contact;
After high-temperature welding, it must be cooled for more than 30 seconds to prevent the protector from being damaged by heat.
‌ Adattabilità ambientale‌:
Avoid using non-sealed protectors (such as traditional contactors) in highly polluted environments;
Regularly check the fatigue and aging of bimetallic strips and replace them in combination with the equipment maintenance cycle.
‌Function conflict avoidance‌:
Automotive motors with anti-pinch function need to adopt software temperature control solutions to avoid hardware protectors interfering with obstacle detection.

♻️ 5. Troubleshooting
Common reasons why the motor burns but the protector does not operate:
‌Wiring error‌: The protector is not connected in series in the main circuit of the motor;
‌Set value is too high‌: The action temperature or current threshold setting exceeds the motor tolerance range;
‌Response delay‌: The bimetal strip requires heat accumulation time and cannot cope with instantaneous short-circuit faults.
It is recommended to give priority to products that have passed the short-circuit test (Clause 18.101) specified in the GB/T 14536.3-2022 standard to ensure reliability under extreme working conditions.