Early warning device and system for motor

The utility model discloses an early warning device and a system for a motor. The early warning device comprises a signal collection device for collecting current signals on a stator side of a motor and voltage signals, a first processor connected to the signal collection device and used for determining resistor temperature on the stator side according to the current signals and the voltage signals, and a second processor connected to the first processor and used for sending out early warning signals according to temperature. The early warning device disclosed by the utility model can accurately monitor motor stator side resistor temperature, and thus the overheating of the motor can be prevented and the motor can be effectively protected.