tailieunhanh - Magnetic Bearings Theory and Applications Part 10

Tham khảo tài liệu 'magnetic bearings theory and applications part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A rotor model with two gradient static field shafts and a bulk twined heads system 119 Fig. 3. Detail of component of the rotor model Fig. 4. Magnetic distribution of a set the component of the permanent magnets of the rotor point mm Fig. 5. Magnetic flux density of a set the component of the permanent magnets of the rotor and a trapped HTS bulk 120 Magnetic Bearings Theory and Applications Fig. 6. Magnetic flux density of a rotary mechanism part of the rotor model Bulk twined heads pulse tube cryocooler We improved a pulse tube cryocooler SPR-05 AISIN SEIKI CO. LTD. . Namely the two bulks were installed on the boxes of a head part Thermal Block CO. LTD. of a pulse tube cryocooler. Figure 7 shows the schematic design of the bulk twined heads pulse tube cryocooler. The rotor explained above was set between the bulk twined heads of this cryocooler. The frost did not occur at the surface of this head in the air because the insulated space in the head was in vacuum condition and the cold HTS bulk insulated the head. This condition was able to rotate the rotor in the air. Two sensors monitored the temperature condition. One sensor sensor1 monitored the temperature of the cold head of the pulse tube cryocooler and the second sensor sensor2 monitored the temperature of the copper holder which inserted the HTS bulk in the upper head of two heads of the bulk twined heads device. Figure 8 shows efficiency of the cooler device. After I reported 1 I tried two improvements to this device. One was that an acrylic board W300 L300mm with two square holes were as the sections of the top of the heads of this device sat the bottom of the head of this device. Other improvement was that the distance between the heads of this device was expanded a few millimetres. These improvements were a key of successful to break through the unstable rotation at about 2 000 rpm. The former was because that the board cut the affect of the turbulence of the promotion gas based on the uneven face of

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