Patent ID: 8069728

Claim:
An apparatus for determining an operating condition of a shaker system that has a field coil, a drive coil that is set in a static magnetic field generated by the field coil and is driven by electromagnetic force, an armature that transfers the force generated at the drive coil to a test specimen, a cooling apparatus to cool the field coil and the drive coil, comprising: means for calculating a necessary excitation force that is the excitation force presently generated by the shaker system, based on information of drive current necessary to yield a desired vibration for the test specimen under condition of a definite field current that is fed as initial field current; means for calculating supposed drive current necessary to generate the necessary excitation force under each supposed field current, the supposed field current being supposed to be varied from the initial field current; means for calculating supposed temperatures of the field coil to which each of the supposed field current is fed and supposed temperatures of the drive coil to which each of the supposed drive current is fed under each supposed cooling capability of the cooling apparatus; means for selecting at least one operating condition that is a combination of the supposed field current and the supposed cooling capability under which the supposed temperatures of the field coil and the drive coil will not exceed limitation and a focused operating feature will be satisfied among multiple combinations of the supposed field current and the supposed cooling capability; and means for outputting the at least one of the operating conditions.