A high-efficiency self-generator includes a rotating body assembly including an outer rotor that is formed to be rotatable with a first central axis as a center point and a plurality of inner rotors, a power generation device that is connected to the outer rotor and generates electricity by rotation of the outer rotor, a pedal device configured to convert an external force generated by a user into a rotational driving force, a gear device configured to rotate the inner rotors, a reduction device configured to change a power transmission ratio between the pedal device and the gear device, a starting device configured to rotate the outer rotor by transmitting the rotational driving force generated by the pedal device to the outer rotor, and a gear control device configured to intermittently rotate the inner rotor.

An electronic device includes: a first housing; a second housing movably coupled with respect to the first housing; a flexible display; a first vibration motor in the first housing; a second vibration motor in the second housing; and at least one processor. The at least one processor: receives a touch input through a display region of the flexible display; in response to the touch input, identifies a first distance between the position of a contact point of the touch input and the first vibration motor, and a second distance between the position and the second vibration motor; and adjusts, on the basis of the first distance and the second distance, the strength of vibration provided through the first vibration motor and the second vibration motor so as to provide a haptic notification.

A power generation module includes an input part, an elastic member, generator, a rotatable member, a transmission part, and a lock part. The elastic member stores energy input to the input part. The generator generates power when a rotor of the generator is rotated. The rotatable member rotates the rotor. The transmission part transmits the energy stored in the elastic member to the rotatable member. The lock part restricts a rotation of the rotor by the transmission part. The energy is stored in the elastic member by the lock part restricting the rotation of the rotor while the input part moves from an initial position to a prescribed position. The restriction of the rotor by the lock part is released and the rotor is rotated by the energy stored in the elastic member when the input part moves to the prescribed position.

A power generation module includes an input part, an elastic member, generator, a rotatable member, a transmission part, and a lock part. The elastic member stores energy input to the input part. The generator generates power when a rotor of the generator is rotated. The rotatable member rotates the rotor. The transmission part transmits the energy stored in the elastic member to the rotatable member. The lock part restricts a rotation of the rotor by the transmission part. The energy is stored in the elastic member by the lock part restricting the rotation of the rotor while the input part moves from an initial position to a prescribed position. The restriction of the rotor by the lock part is released and the rotor is rotated by the energy stored in the elastic member when the input part moves to the prescribed position.