Fan control system, fan system, active ingredient generation system, fan control method, and program

A fan control system for controlling a fan motor that includes a rotor including blades, a stator, and an impregnated bearing impregnated with a lubricant and rotatably holds the rotor by the impregnated bearing,

• the fan control system comprising:
• a controller configured to select a control mode from a plurality of control modes including
• a first mode to operate at a first rotation speed, and
• a second mode to operate at a second rotation speed lower than the first rotation speed;
• a voltage conversion circuit for providing a first voltage to the fan motor in the first mode, and a second voltage lower than the first voltage to the fan motor in the second mode;
• and
• a switch configured to switch between enabling and disabling of a function of selecting the second mode of the controller,
• wherein the switch is configured to disable the function of selecting the second mode based on at least environmental information related to an ambient temperature of the fan motor,
• the controller is configured to:
• when the switch does not disable the function of selecting the second mode,
• cause the voltage conversion circuit to provide the second voltage to the fan motor without selecting the first mode upon or after a start of the fan motor, and
• after a predetermined condition is met, cause the voltage conversion circuit to switch the second voltage to the first voltage and provide the first voltage to the fan motor, and
• when the switch disables the function of selecting the second mode, cause the conversion circuit to provide the first voltage to the fan motor upon the start of the fan motor.

A fan control method for controlling a fan motor that includes a rotor including blades, a stator, and an impregnated bearing impregnated with a lubricant and rotatably holds the rotor by the impregnated bearing, wherein the fan motor is operated in one of:

• a first mode to operate at a first rotation speed,
• a second mode to operate at a second rotation speed lower than the first rotation speed,
• a third mode to operate at a third rotation speed higher than the second rotation speed and with a torque equal to or larger than a start torque that is a minimum torque necessary for starting the fan motor,
• the fan control method comprising:
• selecting the third mode upon a start of the fan motor;
• after a predetermined time has passed, switching the third mode to the second mode;
• and
• after a predetermined condition is met, switching the second mode to the first mode,
• wherein the first mode is not selected before the second mode is selected after the start of the fan motor.