US 12,143,048 B2
Fan control system, fan system, active ingredient generation system, fan control method, and program
Motoji Kawasaki, Shiga (JP); Kouiti Hirai, Shiga (JP); Mikio Ito, Shiga (JP); and Yutaka Uratani, Shiga (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/996,484
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 25, 2021, PCT No. PCT/JP2021/007146
§ 371(c)(1), (2) Date Oct. 18, 2022,
PCT Pub. No. WO2021/229892, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-086341 (JP), filed on May 15, 2020.
Prior Publication US 2023/0231507 A1, Jul. 20, 2023
Int. Cl. H02P 6/20 (2016.01); H02P 29/20 (2016.01); H02P 29/68 (2016.01)
CPC H02P 29/20 (2016.02) [H02P 6/20 (2013.01); H02P 29/68 (2016.02)] 19 Claims
OG exemplary drawing
 
1. 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,
a second mode to operate at a second rotation speed lower than the first rotation speed, and
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; and
a voltage conversion circuit for providing a first voltage to the fan motor in the first mode, a second voltage lower than the first voltage to the fan motor in the second mode and a third voltage higher than the second voltage to the fan motor in the third mode,
wherein the controller is configured to:
cause the voltage conversion circuit to provide the third voltage to the fan motor to start the fan motor,
after a predetermined time has passed, cause the voltage conversion circuit to switch the third voltage to the second voltage and provide the second voltage to 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.