Patent ID: 8315021

Claim:
A motor detecting and protecting apparatus electrically connected with a motor, the motor detecting and protecting apparatus comprising: a detecting unit detecting a state of the motor and outputting at least one first detecting signal and at least one second detecting signal, the detecting unit including: a first resistance having a first end electrically connected with the motor for receiving an electric current flowing through the motor and generating a first voltage; a second resistance having a first end electrically connected with the motor and the first end of the first resistance for receiving the electric current flowing through the motor and generating a second voltage; and a capacitor having a first end electrically connected with a second end of the second resistance; wherein when an electric current flowing through the motor changes, the first voltage and second voltage are changed, with the second voltage changing more gradually than the first voltage due to electrical storage of the capacitor; and wherein the first voltage and the second voltage are the first detecting signal and the second detecting signal, respectively; an error determining unit, electrically connected with the detecting unit, for receiving the first detecting signal and the second detecting signal, wherein the error determining unit has a first predetermined value, and the error determining unit outputs a warning signal while a variation value between the first detecting signal and the second detecting signal exceeds the first predetermined value; and a controlling unit, electrically connected with the error determining unit, for receiving the warning signal and stopping an operation of the motor in accordance with the warning signal, the controlling unit having a reset value, after the controlling unit stops the operation of the motor, the controlling unit outputs a controlling signal in accordance with the reset value for restarting the operation of the motor, wherein the reset value comprises a first value and a second value for respectively determining a number of restart times of the motor and the time interval between each restart of the motor.