Power generation system

A power generation system comprising:

• a cam device including a cam member of which a cam protrudes from an outer circumferential surface, the cam member being rotated by hydroelectric power or wind power;
• a generator including a rotation body in which an arm mechanism that is rotated when the cam comes into contact with the rotation body during rotation of the cam member, a small-diameter wheel, and a large-diameter wheel having an outer diameter larger than that of the small-diameter wheel are attached to a rotation shaft, in which the arm mechanism comes into contact with an outer circumferential surface of either the small-diameter wheel or the large-diameter wheel during rotation of the arm mechanism, and thus the rotation body is rotated, and power is generated by converting rotational energy of the rotation body into electric energy;
• and
• operation control means for transitioning to an operation in a second mode of bringing the arm mechanism into contact with the small-diameter wheel in response to an increase in a rotational speed of the rotation body to a first value while the operation control means is operated in a first mode of bringing the arm mechanism into contact with the large-diameter wheel, and transitioning to an operation in the first mode in response to a decrease in a rotational speed of the rotation body to a second value equal to or smaller than the first value while the operation control means is operated in the second mode,
• wherein the arm mechanism includes a cam arm, a large-diameter wheel arm, a small-diameter wheel arm, a main shaft, and biasing means,
• the main shaft penetrates through a basal end portion of the cam arm, a basal end portion of the small-diameter wheel arm, and a basal end portion of the large-diameter wheel arm,
• the cam arm is rotated about the main shaft in a first direction due to pressing of the cam each time the cam comes into contact with a distal end portion of the cam arm due to rotation of the cam member,
• the biasing means biases the cam arm in a second direction opposite to the first direction each time the cam arm is rotated in the first direction, and the cam arm is rotated in the first direction due to the biasing of the biasing means, and is then reversed and rotated in the second direction,
• the operation control means,
• as an operation in the first mode,
• rotates only the large-diameter wheel arm out of the large-diameter wheel arm and the small-diameter wheel arm together with the cam arm in the first direction, then reverses and rotates the large-diameter wheel arm in the second direction, does not bring the large-diameter wheel arm into contact with the large-diameter wheel by retracting the large-diameter wheel arm while the large-diameter wheel arm is being rotated in the first direction, and brings the large-diameter wheel arm into contact with the large-diameter wheel by stretching the large-diameter wheel arm while the large-diameter wheel arm is being rotated in the second direction, and
• the operation control means,
• as an operation in the second mode,
• rotates only the small-diameter wheel arm out of the large-diameter wheel arm and the small-diameter wheel arm together with the cam arm in the first direction, then reverses and rotates the small-diameter wheel arm in the second direction, does not bring the small-diameter wheel arm into contact with the small-diameter wheel by retracting the small-diameter wheel arm while the small-diameter wheel arm is being rotated in the first direction, and brings the small-diameter wheel arm into contact with the small-diameter wheel by stretching the small-diameter wheel arm while the small-diameter wheel arm is being rotated in the second direction.