Electric actuator, power unit, and electric mobility apparatus equipped with power unit

An electric actuator comprising:

• an electric motor capable of switching rotation direction between forward rotation and reverse rotation;
• a detector configured to detect a rotational position of the electric motor;
• a drive device configured to drive the electric motor in accordance with the rotational position and command values;
• and
• a transmission mechanism having an output shaft mechanically coupled to a rotary shaft of the electric motor, the transmission mechanism being configured to convert forward and reverse rotary motions of the rotary shaft into a unidirectional rotary motion and to transmit the unidirectional rotary motion to the output shaft,
• wherein the transmission mechanism comprises:
• a first mechanism having a moving member that is held so as to be linearly movable and coupled to the rotary shaft of the electric motor, the first mechanism being configured to cause the moving member to linearly reciprocate in conjunction with the forward and reverse rotary motions of the electric motor;
• and
• a second mechanism having a rotary member that is rotatably held, and a connecting rod that is rotatably connected to the rotary member at a first connecting part offset from a rotation center of the rotary member, the connecting rod being rotatably connected to the moving member at a second connecting part of the moving member away from the first connecting part, the second mechanism being configured to cause the rotary member to rotate in one direction in conjunction with the forward and reverse rotary motions of the electric motor,
• wherein the drive device is set with command values determined on the basis of a cam curve of the connecting rod obtained from the rotational position detected by the detector when the output shaft is rotated for one revolution in one direction, using driving power from other than the electric motor, without driving the electric motor.