Overload protection

Micro motor coil is usually made of fine copper wire,resistance to electric current ability is poor.When the motor load is electricalmotor1.blogspot.com bigger or stuck,flows through the coil current quickly Increases,the motor temperature rise sharply at the same time,the copper wire winding is easily destroyed.Such as Fruit can be concatenated polymer PTC thermistor in the motor coil,will provide timely when the motor overload protection function,avoid motor was burned down.Usually the protection of electricity The diagram below.Thermistor is usually

as far as the coil near,so easy to feel single phase motor the temperature thermistor,make the protection more quickly and efficiently.Used for primary thermal protection Resistance is rotor balancing machine usually choose higher stress levels KT250 type thermistors,thermistor for secondary protection usually choose lower stress levels KT60 - B,KT30 - B,KT16 - B and slice motor.