Abstract: A three-degree-of-freedom bearingless switched reluctance motor excited by a constant current source includes a rotor and a stator. The rotor consisting of a rotating shaft and a rotor core, where a plurality of rotor teeth is uniformly distributed on an outer circumference of the rotor core. The stator includes a stator core, a magnetic isolation ring, an axial suspension winding, and a magnetic conduction ring that are sequentially connected, and axial control cores and annular constant current source windings which are symmetrically arranged on both sides of the stator core. Outer edges of the axial control cores are connected to the magnetic conduction ring, and inner edges extend to the rotor core. The stator core and the magnetic isolation ring both consist of an axial part and a radial part of which an outer end is connected to an inner wall of the axial part.

Abstract: A type of degradable polyester fiber and preparing method thereof are disclosed. The preparing method is to melt spinning a modified polyester with the fully drawn yarn (FDY) technique, and the modified polyester is composed of the terephthalic acid segments, the ethylene glycol segments, the 2,5,6,6-tetramethyl-2,5-heptanediol segments and the fluorinated dicarboxylic acid segments, wherein the fluorinated dicarboxylic acid is one selected from 2,2-difluoro-1,3-malonic acid, 2,2-difluoro-1,4-succinic acid, 2,2-difluoro-1,5-glutaric acid and 2,2,3,3-tetrafluoro-1,4-succinic acid. Moreover, the modified polyester is dispersed with the doped ZrO2 powder. The obtain fiber has an intrinsic viscosity drop of 23-28% when stored at 25° C. and R.H. 65% for 60 months. The method herein is of low cost and easy technologies, whereas the obtained fiber has a rapid natural degradation rate and a wide application prospect.

Abstract: A three-degree-of-freedom bearingless switched reluctance motor excited by a constant current source includes a rotor and a stator. The rotor consisting of a rotating shaft and a rotor core, where a plurality of rotor teeth is uniformly distributed on an outer circumference of the rotor core. The stator includes a stator core, a magnetic isolation ring, an axial suspension winding, and a magnetic conduction ring that are sequentially connected, and axial control cores and annular constant current source windings which are symmetrically arranged on both sides of the stator core. Outer edges of the axial control cores are connected to the magnetic conduction ring, and inner edges extend to the rotor core. The stator core and the magnetic isolation ring both consist of an axial part and a radial part of which an outer end is connected to an inner wall of the axial part.

Abstract: A type of degradable polyester fiber and preparing method thereof are disclosed. The preparing method is to melt spinning a modified polyester with the fully drawn yarn (FDY) technique, and the modified polyester is composed of the terephthalic acid segments, the ethylene glycol segments, the 2,5,6,6-tetramethyl-2,5-heptanediol segments and the fluorinated dicarboxylic acid segments, wherein the fluorinated dicarboxylic acid is one selected from 2,2-difluoro-1,3-malonic acid, 2,2-difluoro-1,4-succinic acid, 2,2-difluoro-1,5-glutaric acid and 2,2,3,3-tetrafluoro-1,4-succinic acid. Moreover, the modified polyester is dispersed with the doped ZrO2 powder. The obtain fiber has an intrinsic viscosity drop of 23-28% when stored at 25° C. and R.H. 65% for 60 months. The method herein is of low cost and easy technologies, whereas the obtained fiber has a rapid natural degradation rate and a wide application prospect.

Abstract: A porous ultra-soft ultra-fine denier polyester fiber and preparation method. The modified polyester is spun with a porous spinneret to produce the porous ultra-soft ultra-fine denier polyester fiber, and the spinneret holes on the porous spinneret are arranged in an elliptical arrangement. The porous ultra-soft ultra-fine denier polyester fiber is obtained by metering, extruding, cooling, oiling and high-speed winding the modified polyester chips. The preparation method of modified polyester is as follows: terephthalic acid reacts with ethylene glycol to produce ethylene terephthalate. The modified polyester is obtained by the reaction of terephthalic acid with branched diol. The fiber of the invention has good properties and the deviation rate of fiber density. The deviation rate of fiber density is ?0.5%, the CV value of breaking strength is ?4.0%, the CV value of elongation at break is ?8.0%, the CV value of yarn unevenness is ?2.0%.

Abstract: A low chromatic aberration polyester different-shrinkage composite yarn is made of polyester POY yarn and polyester FDY composite yarn. The polyester POY yarn and polyester FDY yarn is obtained by spinning the polyester solution, the rupture strength of the low color polyester different-shrinkage composite yarn is ?1.9 cN/dtex, the elongation at break is 30.0±5.0%, the crimp shrinkage is 2.50±3.0%, the network degree is 20±5/m, the color difference ?E is less than 0.200. In the invention, the magnesium ethylene glycol is relatively mild, the thermal degradation coefficient is small, the oligomers in the polymerization process is reduced, and the oligomers in the dissolution process are further reduced, so that the appearance of stains and streaks reduces during the dyeing and post-processing heat setting of the polyester fiber, which ensures the fiber's leveling and rubbing fastness.

Abstract: A porous ultra-soft ultra-fine denier polyester fiber and preparation method. The modified polyester is spun with a porous spinneret to produce the porous ultra-soft ultra-fine denier polyester fiber, and the spinneret holes on the porous spinneret are arranged in an elliptical arrangement. The porous ultra-soft ultra-fine denier polyester fiber is obtained by metering, extruding, cooling, oiling and high-speed winding the modified polyester chips. The preparation method of modified polyester is as follows: terephthalic acid reacts with ethylene glycol to produce ethylene terephthalate. The modified polyester is obtained by the reaction of terephthalic acid with branched diol. The fiber of the invention has good properties and the deviation rate of fiber density. The deviation rate of fiber density is ?0.5%, the CV value of breaking strength is ?4.0%, the CV value of elongation at break is ?8.0%, the CV value of yarn unevenness is ?2.0%.

Abstract: A low chromatic aberration polyester different-shrinkage composite yarn is made of polyester POY yarn and polyester FDY composite yarn. The polyester POY yarn and polyester FDY yarn is obtained by spinning the polyester solution, the rupture strength of the low color polyester different-shrinkage composite yarn is ?1.9 cN/dtex, the elongation at break is 30.0±5.0%, the crimp shrinkage is 2.50±3.0%, the network degree is 20±5/m, the color difference ?E is less than 0.200. In the invention, the magnesium ethylene glycol is relatively mild, the thermal degradation coefficient is small, the oligomers in the polymerization process is reduced, and the oligomers in the dissolution process are further reduced, so that the appearance of stains and streaks reduces during the dyeing and post-processing heat setting of the polyester fiber, which ensures the fiber's leveling and rubbing fastness.