Air purifier, air purifying system, and method of controlling air purifying system

An air purifying system, comprising:

• a main air purifier configured to purify air;
• and
• a handheld air purifier configured to purify air at a smaller air purifying capacity than the main air purifier and configured to be mounted on and removed from the main air purifier, the handheld air purifier including:
• a suction body having a first surface and a filter, and
• a handle coupled to the suction body, wherein, when the handheld air purifier is mounted on the main air purifier, the main air purifier performs at least one of suctioning foreign matter from the first surface or sterilizing the first surface,
• wherein the handheld air purifier includes a striking bar provided at a lower surface of the suction body, the striking bar being configured to move forward from the suction body and backward toward the suction body to strike a surface.

An air purifying system, comprising:

• a main air purifier configured to suction ambient air, purify the suctioned air, and discharge the purified air, the main air purifier having a first motor, a first fan, and a first filter;
• and
• a handheld air purifier configured to be seated on and lifted from the main air purifier, the handheld air purifier being configured to suction a lesser volume of air than the main air purifier, purify the suctioned air, and discharged the purified air, and the handheld air purifier having a second motor different from the first motor, a second fan different from the first fan and a second filter different from the first filter,
• wherein an operation of the main air purifier is based on whether the handheld air purifier is seated on the main air purifier.