Door closer system

A method, comprising:

• opening a door coupled to a spring, thereby compressing said spring;
• releasing said door and allowing said spring to expand to initiate closing of said door;
• generating electricity with a motor operable in response to compression and expansion of said spring during opening and closing said door;
• storing said electricity in a storage device;
• and
• rotating a shaft of said motor with said electricity to close said door.

A method of operating a door closer, the method comprising:

• translating a first door movement of a door to a first pinion rotation of a pinion of the door closer, wherein the door closer further comprises a motor having an motor shaft engaged with the pinion via a reduction gear set such that rotation of the pinion is correlated with rotation of the motor shaft;
• translating, by the reduction gear set, the first pinion rotation to a first motor shaft rotation of the motor shaft;
• generating, by the motor, a generated electrical power as a result of the first motor shaft rotation, wherein the generating of the generated electrical power impedes the first motor shaft rotation, thereby impeding the first pinion rotation and the first door movement;
• storing, in a power storage device coupled with the motor, the generated electrical power, thereby providing stored electrical power stored in the power storage device;
• during a second movement of the door that occurs after the first movement of the door, discharging, from the power storage device to the motor, at least a portion of the stored electrical power, thereby providing the motor with discharged electrical power;
• generating, by the motor as a result of the motor receiving the discharged electrical power, a torque driving the motor shaft to rotate in a second motor shaft rotation;
• translating, by the reduction gear set, the first output rotation to a second pinion rotation of the pinion;
• and
• translating the second pinion rotation to a second door movement of the door, thereby driving the door toward a closed position.

A method of operating a door closer comprising a pinion, a motor including a motor shaft engaged with the pinion via a reduction gear set, and a power storage device coupled with the motor, the method comprising:

• translating an opening movement of a door to a first pinion rotation, thereby causing the reduction gear set to rotate the motor shaft in a first motor shaft rotation, thereby causing the motor to generate a first electrical power, thereby causing the motor to impede the opening movement of the door;
• storing the first electrical power in the power storage device;
• translating a first closing movement of the door to a second pinion rotation of the pinion, thereby causing the reduction gear set to rotate the motor shaft in a second motor shaft rotation, thereby causing the motor to generate a second electrical power, and thereby causing the motor to impede the first closing movement of the door;
• storing the second electrical power in the power storage device;
• and
• during a second closing movement of the door occurring after the first closing movement of the door, discharging at least a portion of the electrical power stored in the power storage device to the motor, thereby causing the motor to drive the motor shaft in a third motor shaft rotation, thereby causing a third pinion rotation via the reduction gear set, and thereby urging the door toward a closed position;
• wherein the first pinion rotation is in a first rotational direction;
• and
• wherein the second pinion rotation and the third pinion rotation are in a second rotational direction opposite the first rotational direction.