1. The thermistor can be connected to the motor circuit in parallel or in series.
2. The access method of thermistor depends on the specific application requirements and circuit design.
If it is necessary to monitor the temperature change of the motor in real time, the thermistor can be connected in series in the motor circuit to reflect the temperature change by measuring the change in the resistance value.
If it is only necessary to trigger protection measures when the motor is overheating, the thermistor can be connected in parallel in the motor circuit, when the motor temperature exceeds the set value, the resistance value of the thermistor will change, triggering protection measures. 3. In addition, the access of thermistors can also be extended according to specific circuit requirements. For example, more complex circuits can be built by connecting other components (such as capacitors, inductors, etc.) to achieve more precise temperature control or protection functions.
At the same time, the appropriate thermistor type and parameters can be selected according to the characteristics of the motor and the working environment to ensure the stability and reliability of the circuit.
Thermistor protection is an effective protection method for motor protection, but its use is limited to the motor has been embedded in the three-phase winding thermistor before the factory, through the external relay (such as PTC protection relay, many manufacturers have done) can detect the resistance value of the thermistor to determine whether the motor is overheating.
As for how to connect the PTC you bought after, it is not clear!