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75results about How to "Achieve symmetry" patented technology

Four-phase and double-salient brushless direct current motor with symmetrical phase inductances

The invention discloses a four-phase and double-salient brushless direct current motor with symmetrical phase inductances. According to the four-phase and double-salient brushless direct current motor, a unit motor is of a novel 12 / 9 salient structure or a novel 12 / 15 salient structure, each excitation element is wound after spanning three stator poles, each stator coil of each phase stator winding is distributed at different positions, and the symmetry of the phase inductances is achieved by a mode of symmetrically distributing the four phase stator windings; the pole-arc coefficient matching size of motor stators and rotors is determined by theoretical analysis and emulation verification methods, so that the phase inductances of the motor are hoisted and decreased by an electrical angle of 180 degrees, the total permeance of exciting windings remain basically unchanged, the positioning torque of the motor is small, and the four phases are electrified at the same time to operate. In addition, the four phase stator windings are independent in pairs, so that the motor can operate by only using the two phases after one phase is in fault, and the fault tolerance performance is favorable. Moreover, the total permeance of the exciting windings is unchangeable, so that the four-phase and double-salient brushless direct current motor has the advantages of small positioning torque and the like.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Data chain information circulation control system based on block chain as well as method

The invention belongs to the technical field of transmission control procedures such as a data chain stage control procedure and discloses a data chain information circulation control system based ona block chain as well as a method. The system disclosed by the invention is based on a weighted PBFT algorithm, can distribute weights specific to different entity characters of a data chain, fully considers significance of different characters of the data chain as well as influence of the different characters on consistency and has high flexibility; based on an access control scheme of the blockchain, consistency and tampering resistance of the block chain guarantee credibility of a contract self, a smart contract can be automatically executed, characteristics of the block chain are combined, and credibility of an access strategy output by the contract is guaranteed, so that data security is effectively guaranteed; and attribute encryption is combined with symmetrical encryption, data isencrypted by using a symmetrical encryption scheme, and a symmetric key is encrypted by using an attribute encryption algorithm, so that efficient encryption is guaranteed, and flexible access control is supported.
Owner:XIDIAN UNIV

Optical fiber gyroscope with optical fiber ring adopting double-ring design

The invention discloses an optical fiber gyroscope with an optical fiber ring adopting a double-ring design. The optical fiber gyroscope comprises a light source, a photoelectric detector, an optical fiber coupling device, a signal processor, an optical modulator and an interference part, wherein the interference part comprises two optical fiber rings and a heat insulation device; the heat insulation device comprises an inner cavity and an outer cavity; a hard insulating ring is mounted between the inner cavity and the outer cavity; a heat guide groove is mounted in the inner cavity; the two optical fiber rings are symmetrically mounted on the two sides of the heat guide groove; a small hole is formed in the heat guide groove; corresponding ends of the two optical fiber rings are spliced and a splicing point is located in the small hole of the heat guide groove; leading-out ends of the two optical fiber rings are led out from other small holes of the heat guide groove and penetrate through the inner cavity and the outer cavity respectively; the leading-out end of one optical fiber ring is connected with a first output end of the optical modulator and the leading-out end of the other optical fiber ring is connected with a second output end of the optical modulator; and the small holes on the heat guide groove are sealed, and the inner cavity and the outer cavity are sealed. The optical fiber gyroscope has the advantages of high temperature stability.
Owner:HARBIN ENG UNIV

Traction transformer series-connected in one box by two low voltage winding layers for AT (Auto-Transformer) power supply

The invention discloses a traction transformer series-connected in one box by two low voltage winding layers for AT (Auto-Transformer) power supply, relating to traction transformers. The ordinary traction transformer for AT power supply comprises a T single phase traction transformer and an M single phase traction transformer, the two transformers are necessarily and independently designed, the structure is complex, the manufacturing difficulty is big, and design requirements are difficultly satisfied. The traction transformer is characterized in that a core limb group comprises four core limbs, and three winding layers are sleeved on the core limbs from inside to outside; the first winding layers of the first core limb and the third core limb are power supply side windings, and the second winding layer is a feed side winding; the first winding layers of the second core limb and the fourth core limb are the feed side windings, and the second winding layer is a power supply side winding; and the power supply side windings on the first core limb and the second core limb and the power supply side windings on the third core limb and the fourth core limb are respectively connected in series. In the invention, because the T single phase traction transformer and the M single phase traction transformer are uniformly designed into the traction transformer, the structure is simple, the design requirement is satisfied, and the design cost and the production cost are reduced.
Owner:WOLONG ELECTRIC GRP CO LTD +1

Supporting device for integrated cooker smoke exhaust pipe and installation method thereof

The invention discloses a supporting device for an integrated cooker smoke exhaust pipe. The supporting device comprises a support, a connecting vertical rod, a connecting block and a connecting cross rod. Positioning mechanisms are arranged on the left side and right side of the support correspondingly. The connecting vertical rod is vertically arranged on the support. The connecting cross rod is transversely arranged on the connecting block. A supporting assembly is arranged on the connecting cross rod. An installation method comprises the following steps of (1) installing the positioning mechanisms and the support; (2) installing an upper abutting plate and a lower abutting plate; (3) splicing the connecting vertical rod and the connecting block; (4) installing the connecting cross rod and the supporting assembly; and (5) installing an exhaust pipe and the supporting device. The exhaust pipe is supported and positioned through the supporting device, so that vibration in the exhaust process of the exhaust pipe is reduced, the smoke exhaust effect of the smoke exhaust pipe is guaranteed, and meanwhile, the deformation rate of the exhaust pipe can be alleviated, the sealing performance of a connection opening of the exhaust pipe is ensured, excessive vibration in the smoke exhaust process of the exhaust pipe is avoided, friction with surfaces like a wall body and a cabinet body is avoided, and the service life of the exhaust pipe is effectively prolonged.
Owner:浙江蓝炬星电器有限公司

Multi-layer record carrier and method of manufacturing thereof and recording thereon, with reduced transmission differences in the upper layer

A multi-layer record carrier and method of manufacturing thereof and recording thereon, includes data written in units of blocks on tracks of at least two information layers. A first guard field is written at the start of a data block and a second guard field is written at the end of the data block. The power in the focused spot in the deepest of the at least two information layers is maintained substantially at an optimal value, by setting the length of the first and second guard fields such that the end position of the second guard field of a preceding data block is located within the area of the first guard field of the succeeding data block. Thereby, gap portions between the first and second guard fields can be prevented. Alternatively, the length of the first and second guard fields is set to be approximately equal to the sum of half the diameter of a recording beam in the upper one of the at least two information layers when focused on the lowest one of the at least two information layers and a maximum allowed misalignment between the two layers. Thereby, the area through which the beam passes in the information layer is of a uniform nature, when user data is being read or written. The at least two information layers are aligned by optically measuring and aligning alignment marks, such as header spokes, at predetermined measuring points.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV

Control method for asymmetric electric-hydraulic proportional system based on model transferring

The invention discloses a control method for an asymmetric electric-hydraulic proportional system based on model transferring. By converting a transfer function, an asymmetric mathematical model of the asymmetric electric-hydraulic proportional system is converted into a symmetric system model, the symmetry of a load flow model is achieved, and when a unified controller is adopted, responses of forward and reverse motions are identical; by means of signal conversion, the load flow model of the asymmetric system is established, and the purposes of transfer function converting and model converting are achieved, and a new established system model serves as a symmetric load flow model. The achieving method comprises the steps that a reference signal symmetrical to a proportional valve is given, after a signal is converted, a new input signal of the proportional valve is obtained, and proportional valve is controlled to work, so that load flows of the asymmetric electric-hydraulic proportional system in a proportional valve linear region in the forward motion and the reverse motion is identical; by means of the method, an asymmetric effect is eliminated by an asymmetric factor of the system through mathematical conversion, and the identical response of the asymmetric electric-hydraulic proportional system is achieved simply and intelligently.
Owner:CENT SOUTH UNIV

Automobile plate spring guide arm

InactiveCN105620217ASolve the design heightAddress design spaceResilient suspensionsAir springEngineering
The invention provides an automobile plate spring guide arm. A curled lug is arranged upwards at one end of a flat and straight plate spring. The automobile plate spring guide arm is characterized in that a Z-shaped plate spring is arranged downwards at the other end of the flat and straight plate spring and side edges are bent from the bottom edge to the side faces of the Z-shaped plate spring; the side edges are arranged on the two sides of the bottom edge of the Z-shaped plate spring; a supporting arm and the flat and straight plate spring are perpendicular to the bottom edge of the Z-shaped plate spring; and the included angle formed by each side edge and the bottom edge of the Z-shaped plate spring ranges from 30 degrees to 50 degrees and the distance between an air bag installation center position on each side edge and the center of the supporting arm is not larger than 120 mm. By the adoption of the automobile plate spring guide arm, the beneficial effects of the flat and straight plate spring and Z-shaped and side bent type plate spring guide arms are combined, the problems existing in air spring design height and transverse arrangement space are well solved, the mechanical characteristic of a spring steel material is brought into full play, a composite air suspension structure is simplified, and the requirement for the low weight of a whole automobile is met; and the composite air suspension structure is better optimized, the number of parts is reduced, and the requirement for the low weight design of the whole automobile is met.
Owner:东风汽车悬架弹簧有限公司

Air swinging mechanism of air conditioner and air conditioner

The invention discloses an air swinging mechanism of an air conditioner and the air conditioner, and belongs to the technical field of air conditioners. The air swinging mechanism comprises swinging blades, a connecting rod and a motor, wherein the connecting rod comprises a first connecting rod and a second connecting rod; the swinging blades, the first connecting rod, the second connecting rod and the motor are sequentially connected; a hinge point where the swing blades are connected to a housing at an air outlet of the air conditioner is treated as a first hinge point; a hinge point wherethe swinging blade is connected to the first connecting rod is treated as a second hinge point; a hinge point where one end of the first connecting rod is connected to the first end of the second connecting rod is treated as a third hinge point; a hinge point where the second end of the second connecting rod is connected to an output shaft of the motor is treated as a fourth hinge point; the distance from the first hinge point to the second hinge point is equal to the distance from the third hinge point to the fourth hinge point; and the distance from the first hinge point to the fourth hingepoint is equal to the distance from the second hinge point to the third hinge point. The air swinging mechanism solves the problem of asymmetric angles of the swinging blades leftward and right rotating in the air conditioner.
Owner:QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD +1

Supersoft wet pressure-change resin and preparation method and application thereof

The invention relates to the technical field of chemical products and preparation methods thereof, and discloses supersoft wet pressure-change resin and a preparation method and application thereof. The supersoft wet pressure-change resin is prepared from the following raw materials in kilogram by weight: 50 kg of PE-1, 50 kg of PE-2, 100 kg of PE-3, 25 kg of PCDL-2000, and 697 kg of DMF (DMF is delivered for two times, 300 kg of DMF is delivered for the first time, and 397 kg of DMF is gradually delivered for the second time). According to the supersoft wet pressure-change resin and the preparation method and application thereof, by selecting and matching the proper proportion of polycarbonate, the high-temperature resistance of the resin can be greatly improved, scorching of the surfaceof synthetic leather can be prevented while the pressure change effect is achieved, by selecting polyester with different molecular weight for mixing and matching, the symmetry of a polyurethane molecular structure is lowered, better solubility is achieved compared with products made of polyester with the single molecular weight, the low-temperature resistance is good, the resin appearance is moreclear and transparent, and ethylene glycol is selected during chain extender selecting to be matched with the appropriate amount of other long-chain chain extenders.
Owner:华大化学(安徽)有限公司

A Control Method of Asymmetric Electro-hydraulic Proportional System Based on Model Transformation

The invention discloses a control method for an asymmetric electric-hydraulic proportional system based on model transferring. By converting a transfer function, an asymmetric mathematical model of the asymmetric electric-hydraulic proportional system is converted into a symmetric system model, the symmetry of a load flow model is achieved, and when a unified controller is adopted, responses of forward and reverse motions are identical; by means of signal conversion, the load flow model of the asymmetric system is established, and the purposes of transfer function converting and model converting are achieved, and a new established system model serves as a symmetric load flow model. The achieving method comprises the steps that a reference signal symmetrical to a proportional valve is given, after a signal is converted, a new input signal of the proportional valve is obtained, and proportional valve is controlled to work, so that load flows of the asymmetric electric-hydraulic proportional system in a proportional valve linear region in the forward motion and the reverse motion is identical; by means of the method, an asymmetric effect is eliminated by an asymmetric factor of the system through mathematical conversion, and the identical response of the asymmetric electric-hydraulic proportional system is achieved simply and intelligently.
Owner:CENT SOUTH UNIV
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