US 12,072,113 B2
Fan device, and utilization unit and heat source unit of an air conditioner, hot water supplier, and air cleaner each including the fan device
Akihiro Nakano, Osaka (JP); and Yoshinori Takayama, Osaka (JP)
Assigned to Daikin Industries, Ltd., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jul. 14, 2023, as Appl. No. 18/222,117.
Application 18/222,117 is a continuation of application No. PCT/JP2022/002415, filed on Jan. 24, 2022.
Claims priority of application No. 2021-013491 (JP), filed on Jan. 29, 2021.
Prior Publication US 2023/0358428 A1, Nov. 9, 2023
Int. Cl. F24F 11/61 (2018.01); F24F 1/0022 (2019.01); F24F 1/38 (2011.01)
CPC F24F 11/61 (2018.01) [F24F 1/0022 (2013.01); F24F 1/38 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A fan device comprising:
a motor having a variable number of revolutions, the motor including a shaft supported by a hermetically sealed bearing enclosing lubricant; and
an electronic controller configured to drive the motor,
the electronic controller being configured to execute,
when continuously driving the motor at a first number of revolutions or less for a first time period, driving the motor at a second number of revolutions more than the first number of revolutions for a second time period shorter than the first time period,
the first number of revolutions causing poor oil film formation of the lubricant in the bearing if the motor is driven for more than the first time period, and
the second number of revolutions causing oil film formation of the lubricant in the bearing if the motor is driven for the second time period.