Coffee machine

A coffee machine, comprising:

• a first grinder configured to grind coffee beans;
• a fan configured to generate a wind pressure by rotating to separate waste from the ground beans ground by the first grinder;
• a fan motor configured to cause the fan to rotate;
• a setting unit to select a set value;
• and
• a control unit configured to control rotation of the fan motor according to a PWM value corresponding to the set value selected by the setting unit, wherein
• the control unit acquires information related to a rotation speed of the actually rotating fan motor, corrects the PWM value based on the acquired information, and controls the rotation of the fan motor according to the corrected PWM value,
• a storage unit configured to update and store the corrected PWM value each time the correction is performed,
• the storage unit is configured to save the corrected PWM value updated and stored even if power is cut, and
• when the power is applied next time, the control unit controls the rotation of the fan motor according to the corrected PWM value at the time of cutting the power, which is stored in the storage unit.