Air compressor

An air compressor comprising:

• a tank configured to accommodate compressed air having a pressure;
• a compression mechanism configured to supply compressed air to the tank;
• a motor configured to drive the compression mechanism;
• and
• a control circuit,
• wherein the control circuit selects one of a plurality of modes, each of the plurality of modes having a rotational speed of the motor and a reference restart pressure, the plurality of modes including a first mode and a second mode, the first mode having a first rotational speed as the rotational speed of the motor and a first reference restart pressure as the reference restart pressure, the second mode having a second rotational speed as the rotational speed of the motor and a second reference restart pressure as the reference restart pressure, the first mode and the second mode being defined so that at least one of a first condition and a second condition is satisfied, the first condition being that the first rotational speed is faster than the second rotational speed, the second condition being that the first reference restart pressure is higher than the second reference restart pressure;
• wherein the control circuit executes one of the plurality of modes as a target mode in which the control circuit controls the motor to restart by comparing the reference restart pressure corresponding to the target mode with the pressure of the compressed air in the tank and rotates the motor at the rotational speed corresponding to the target mode;
• and
• wherein the control circuit automatically changes the target mode to the second mode from the first mode when the control circuit detects, a prescribed first number of times, a pressure change rate of the compressed air in the tank larger than a prescribed rate value.