-This paper suggests the new PMSM design that can reduce leakage magnetic flux.Through adapting non-magnetic frame structure, it decreases leakage magnetic flux on the rotor's rib and web structure. And with this, it increases power density of the motor. To verify the effectiveness of the new design of rotor compared to the common type, through small sized real model's test was conducted. To obtain final model, structural FEM analysis was also used for structural stability. Additional loss generation problem that can occur in the new frame structure was checked with the 3D FEM analysis.

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The classical Roentgenographic features of tuberculosis of the spine such as narrowing of the intervertebral disc , collapse of the vertebral bodies, with or without the shadow of a cold abscess, present a specific pictu re of the aιtual pathological process. However, the diagnosis of tuberculosis is n ot confirmed unless proven by biopsy , or the finding of the tubercle bacillus.120 cases of proven spinal tuberculosis , at Kwangju Christian Hospital during the period from January 1973 through August 1980 , were studied and analysed.The results were as follows:1. The ratio of male to female was 1 : 1.1. The age preference was under 30 years old.2. The most frequent site of involvement was the lumbar spine (44.1%) and next the thoracic (39.2%).3. The incidence of Iytic type was 50.8%, mixed type 36.7%, and sclerotic type 12.5%.4. Associated pulmonary tuberculous lesions were observed in 94 patients (7 8.3%).5. The central type , with wedging or collapse of the vertebral body , was more common in the younger age group and the intervertebral articular type in older patients.6. The incidences of typical radiologic findings were: Collapse of vertebral body (90%) , cold abscess (78 .3%) and narrowing of intervertebral space (70%).7. Associated kyphosis was observed in 37 cases (30 .8%). Among these 37 cases the range of angulation was between 21 to 40 degrees in 40%.