Abstract: An electric motor includes a stator; an annular end cap, fastened at a first end of the stator; a threaded seat that is mounted at an outward end face of the annular end cap for receiving a first gas foil thrust bearing; a shaft, inserted through the stator, through the annular end cap, and through the threaded seat; a thrust runner mounted at an end of said shaft adjacent the threaded seat; a first gas foil thrust bearing that is mounted into the threaded seat, adjacent a face of the thrust runner facing the stator; a bearing cap that has a threaded fitting by which it is attached onto the threaded seat; and a second gas foil thrust bearing that is mounted into the bearing cap adjacent to a face of the thrust runner opposite the first gas foil thrust bearing.

Abstract: A stator core (11) is mounted to a stationary member (22) and electric wiring on the stator side is carried out, to thereby assemble a first sub-module (20), and a rotor core (12) is mounted to a rotary member (21) and electric wiring on the rotor side is carried out, to thereby assemble a second sub-module (30). Thereafter, the first and second sub-modules are assembled together, with the stator core and the rotor core opposed to each other, whereby a separable transformer is assembled. A guide member (27), having first and second reference faces defining reference positions in diametrical and axial directions of the rotation shaft (21), respectively, is provided in the rotation shaft (21) rotatably supported by the stationary member and mounted with the rotor core. Mounting positions of the cores are determined with use of the guide member, thereby precisely setting a center position between the cores and a gap length g.

Abstract: In a head drum assembly and a tape drive having said head drum assembly, the head drum assembly comprises a fixed shaft secured to a lower stator; a rotor having a motor part, and provided with a magnetic head; an upper stator disposed at a distance in an axial direction with the rotor held and secure to said shaft; and rotary transformers individually provided between the rotor and the stator. Thereby, there is realized a small and high performance head drum assembly and a tape drive in which crosstalk between different transmission system is prevented, and which improved mounting accuracy of rotary transformations.

Abstract: A rotary magnetic head unit has a non-contact type transmission device capable of reliably performing non-contact transmission both in signal and power supply systems and designed so as to be smaller in size. The non-contact type transmission device is formed of a rotating member and a fixed member each having a power supply wiring section for transmitting a power supply, a signal wiring section for transmitting a signal, and a crosstalk prevention section positioned between the power supply wiring section and the signal wiring section to prevent crosstalk between these sections. If a reproducing head formed of a magnetoresistive element is used by being supplied with a bias current from the power supply transmitted by the power supply wiring sections of the rotary and fixed members, the rotary magnetic head unit uses bias current control means to change the bias current supplied to the reproducing head according to the amount of wear of the recording head during reproduction from signals from magnetic tapes.