Motor comes with a temperature sensor

General 220V motor or Auto Temperature Sensor controller is loaded in the PTC element, this element of the bundle of the stator winding bridge line, the temperature generally choose 60 °, the motor winding temperature of the element exceeds this value automatically disconnected, and then lead wire connected to the control circuit, the implementation of effective protection, but did not find large motors installed, because the general has a thermal relay in a circuit to do protection, motor overload protection when the delay period, if you installed him, and occasionally a pulse will cause the Motor Sensors is stopped, the motor does not actually affect the normal operation of the circuit in a complete chain of effects will cause more harm than good. If you want the motor temperature monitoring, testing facilities can be Hotbox.