Valve actuator

A valve actuator, comprising:

• a housing;
• a motor that is disposed in the housing and that includes a motor shaft;
• a drive gear coupled to the motor shaft;
• an output shaft disposed in the housing;
• an output gear that is coupled to the output shaft and engaging with the drive gear;
• and
• a stopper that is disposed in the housing and that is configured to control a rotation radius of the output gear,
• wherein the drive gear comprises an inner part, an outer part disposed at an outside of the inner part, a first magnet disposed at the outer part, and a second magnet that is disposed at the inner part and that faces the first magnet.

A valve actuator, comprising:

• a housing;
• a motor that is disposed in the housing and that includes a motor shaft;
• a drive gear coupled to the motor shaft;
• a transfer gear engaging with the drive gear and that is configured to, based on the drive gear rotating, be rotated according to a first gear ratio;
• an output shaft disposed in the housing;
• an output gear that is coupled to the output shaft and that is in contact with the transfer gear;
• and
• a stopper that is disposed in the housing and that is configured to control a rotation radius of the output gear,
• wherein the transfer gear comprises a first transfer gear, a second transfer gear configured to, based on the first transfer gear rotating, be rotated according to a second gear ratio, a cylindrical first magnet disposed on the first transfer gear, and a cylindrical second magnet disposed on the second transfer gear, and
• wherein the cylindrical first magnet and the cylindrical second magnet horizontally overlap each other and define a predetermined gap.