Abstract: A linear oscillating actuator gives a smooth reciprocatory movement with a minimum of incidental vibrations or stresses. The actuator includes an oscillator carrying a permanent magnet as well as an output shaft which is adapted to be connected to drive a load, and a stator assembly carrying an electromagnet. The electromagnet generates a magnetic field which interacts with the permanent magnet to reciprocate the oscillator relative to the stator assembly in a linear path. A spring link is provided to resiliently support the oscillator to the stator assembly with a gap distance left therebetween for allowing the oscillator to reciprocate in the linear path. The spring link is configured to deform resiliently also in a direction other than along the linear path so as to allow the oscillator to move to and away from the stator assembly or to twist relative to the stator assembly.

Abstract: A linear oscillating actuator gives a smooth reciprocatory movement with a minimum of incidental vibrations or stresses. The actuator includes an oscillator carrying a permanent magnet as well as an output shaft which is adapted to be connected to drive a load, and a stator assembly carrying an electromagnet. The electromagnet generates a magnetic field which interacts with the permanent magnet to reciprocate the oscillator relative to the stator assembly in a linear path. A spring link is provided to resiliently support the oscillator to the stator assembly with a gap distance left therebetween for allowing the oscillator to reciprocate in the linear path. The spring link is configured to deform resiliently also in a direction other than along the linear path so as to allow the oscillator to move to and away from the stator assembly or to twist relative to the stator assembly.

Abstract: The device has a torque measuring means for measuring the torque produced by pedals and a rotational speed measuring means for measuring the pedal rotational speed. Pedal load is controlled such that it increases gradually. The correlation between the torque achieved by a subject and the pedal rotational speed is measured at two or more points until the subject can no longer resist the pedal load. These measurement data are approximated by a curve. The device has a control means for estimating the maximum torque achievable by the subject to be the torque achieved by the subject as the pedal rotational speed approaches zero based on this measurement data curve. Thus, the device enables adequate evaluation of myodynamia without achieving maximum myodynamia.