33results about How to "Reduced ampere-turns" patented technology

The invention discloses a construction method for an FNN (fuzzy neural network) inverse controller of an AC (alternating current) electromagnetic levitation spindle based on rough set theory, comprising the steps as follows: taking a second derivative of a composite controlled object expected to output as input of an FNN inverse system based on the rough set theory, determining a basic structure of the FNN inverse system based on the rough set theory, selecting static experimental data, training offline the FNN based on the rough set theory to implement inverse of a composite controlled object model, constructing the FNN inverse system based on the rough set theory, constructing an inverse system of the composite controlled object by adopting an FNN inverse method based on the rough set theory, and coupling an AC electromagnetic levitation spindle system which is a nonlinear, strongly coupled multi-input multi-output system into a pseudo linear system. According to the construction method, independent control among 5 DOF (degree of freedom) offset variables of the AC electromagnetic levitation spindle can be implemented; meanwhile, better control performance and load disturbance resistance capacity can be acquired.

The invention discloses a gas magnetic bearing electric spindle and a control system thereof. The gas magnetic bearing electric spindle structurally comprises a radial-axial auxiliary bearing, a radial displacement sensor, a radial displacement sensor bracket, a radial hybrid magnetic bearing, a limiting sleeve, a high-speed motor, a steel cylinder, an axial thrust gas bearing, a radial auxiliary bearing, a rotating shaft, a front end cover and a rear end cover. For the spindle with the novel structure, the invention provides a fuzzy control system of the gas magnetic bearing electric spindle based on a rough set theory method. The fuzzy control system comprises a controller, a power amplification module, a prototype body and a displacement detection module. Compared with a conventional fuzzy control system, the control system introduces a fuzzy control method of a rough set theory, simplifies original fuzzy control rules, and can effectively remove redundant information knowledge, so that the control system is more simple and easier to control, the dynamic performance of a spindle system is improved, and the performance of the control system can be effectively enhanced.

The invention provides a magnetic suspension bearing of a hybrid magnetic circuit, which relates to the technical field of magnetic suspension bearings. The invention overcomes the defects of large electric power, large volume and heavy weight of the existing magnetic suspension bearing. Four stator teeth in a stator core in the magnetic suspension bearing of the hybrid magnetic circuit of the invention are uniformly distributed on the inner surface of an annular yoke in an angle of 90 degrees, and the width Wt of the stator teeth in the circumferential direction meets the following condition: Wt<pi Di / 4, wherein Di represents the inner diameter of the stator core. A magnetism gathering yoke of a permanent magnet is arranged between the tooth ends of every two adjacent stator teeth facingan air gap, a parallel slot is formed on the bisector of the magnetism gathering yoke of the permanent magnet along the radial direction, a permanent magnet in a flat structure is embedded in the slot, and the permanent magnet is magnetized in parallel along the tangential direction. A rotor is cylindrical or tubular and is composed of a magnetism guiding ring and a rotating shaft, and the magnetism guiding ring is sleeved outside the cylindrical or tubular rotating shaft. The magnetic suspension bearing of the hybrid magnetic circuit of the invention has the advantages of low loss, low temperature rise, good control characteristic, small volume, light weight and wide application prospect.

The invention relates to a mixed type driving and driven magnetic suspension bearing, which solves the problems of large volume, heavy weight and high temperature rise of the conventional magnetic suspension bearing. Two circular ring-like rotor permanent magnets are sleeved on an outer surface of a rotor magnetically-conductive yoke cylinder along axial direction; an inner surface of a stator iron core is grooved along the axial direction to form 4n stator teeth; two tile-shaped stator permanent magnets are fixedly adhered to the inner surfaces of the first, third, ..., and (4n-1)th stator teeth along the axial direction; the position of each stator permanent magnet corresponds to that of one of the circular ring-like rotor permanent magnets; the second, fourth, ..., and 4nth stator teeth are armature teeth in a double-teeth structure; a coil is wound on each tooth in the double-teeth structure; the coils on all armature teeth are connected in series to form a radial force control winding; and two coils on two teeth which are opposite by 180 degrees in circumference are connected in series in reverse direction to form a set of windings. By the invention, the dynamic response of the bearing is improved.

The invention discloses an axial-radial three-degree-of-freedom hybrid magnetic bearing, which comprises an annular axial stator, a permanent magnet ring, a radial stator with four magnetic poles, an axial control winding, a radial control winding, a suction disk and a rotating shaft. The axial stator uses a radially magnetized permanent magnet ring to be placed between the axial stator and the radial stator, and they are mounted together. The axial control winding is wound in an annular groove composed of an axial stator, a permanent magnet ring, a radial stator, a rotating shaft and a suction disk. The radial control windings are respectively wound on the four magnetic poles of the radial stator. Two suction discs are respectively placed on both sides of the stator assembly. The invention greatly reduces the axial length of the magnetic bearing, and the levitation force can be made larger; the direct current is used for control, which effectively reduces or eliminates the eddy current loss; does not occupy too large radial and axial lengths, and increases the hybrid type The scope of application of the magnetic suspension bearing; the structure is simple, the control is convenient and easy to realize.

The invention discloses a radial-axial mixed magnetic bearing which is driven by a radial four-pole two-phase AC. A permanent magnet is in cirque type and filled with magnetism in radial direction andis embedded into a cirque concave trough at the internal side of an axial stator and closely connected with the external side of the radial four-pole stator; meanwhile, the permanent magnet providesradial magnetic bias flux and an axial magnetic bias flux; the axial stator adopts a dual-piece eight-pole radial-axial dual magnetic pole surfaces structure with two pieces multiplied by four poles;the four poles of the radial stator are uniformly distributed along the circumference and arranged between the axial stator magnetic poles which face to each other axially; a rotor is sheathed on a rotation shaft by the overlapping and pressing of a cirque silicon sheet, forms an axial air gap with the axial stator and a radial air gap with the radial stator and the axial stator; axial control coils which face to each other axially are connected in series to generate an axial control flux when getting electricity; each radial control coil is enwound on two axial stator magnetic pole external coils which face to each other axially and generates a racial control flux when getting the electricity. The invention has the advantages of reducing the volume of a power amplifier, reducing the costof the power amplifier, simplifying a driving control method, and improving the working efficiency of the magnetic bearing.

The invention relates to a mixed excitation shaft radial magnetic suspension bearing, and relates to the mixed excitation shaft radial magnetic suspension bearing, solving problems of high electric power consumed by the bearing and severe coil heating of the existing magnetic suspension bearing when great suspension power is required. According to the invention, the inner side of a stator core isprovided with 4n teeth, the first, the third,... (4n-1) teeth are axial winding teeth of a dual-tooth structure circumferentially; an axial force control coil is wound on each dual-tooth structure respectively; the winding directions of the two axial force control coils are opposite and are connected in series; a tile-shaped stator permanent magnet is respectively pasted and fixed on the inner end surface of the dual-tooth structure, the second, the fourth,... 4n teeth are radial winding teeth, one radial force control coil is wound on each radial winding tooth, and two radial force control coils which are opposite in a circumference in 180 degrees are connected in series reversely, and a radial force control coil set is formed; and a rotor magnetic conduction yoke cylinder is positioned in a stator, and is coaxial with the stator.

The invention discloses a U-shaped combined lifting electromagnet, which includes an electromagnetic unit and a magnetic yoke; the electromagnetic units are even in number, and there are at least four electromagnetic units; one end of the iron core of the electromagnetic unit is fixedly connected with the magnetic yoke, The axis of the iron core is perpendicular to the yoke; starting from the electromagnetic unit fixed at the end of the yoke, every two electromagnetic units form a U-shaped electromagnet, and the two adjacent electromagnetic units of two adjacent U-shaped electromagnets The magnetic polarity is the same; the electromagnetic unit and the yoke are connected by bolts. The invention has the characteristics of low energy consumption, light weight and convenient maintenance.

The invention relates to an external rotor radial-axial three degrees of freedom hybrid magnetic bearing, wherein axial stators adopt dual-piece type hexad-pole structures, and each piece consists of three magnetic poles of the axial stators evenly distributed on the circumference; radial stators with the three magnetic poles evenly distributed on the circumference are positioned between two pieces of the axial stators; three blocks of permanent magnets have blocky circular shapes and are charged with magnetism in the radial direction, and the three blocks of the permanent magnets are embedded in circular grooves on the outer sides of the magnetic poles of the radial stators and provide radial and axial biasing magnetic fluxes simultaneously; an axial air gap is formed between the axial stators and a rotor, and a radial air gap is formed between the radial stators and the rotor; axial control coils are close to the axial stators and are placed in the inner sides of the axial stators to provide axial control current by a direct current linear power amplifier; and three radial control coils are wound on three magnetic poles of three radial stators to perform drive control by a three-phase alternating current power inverter. The external rotor radial-axial three degrees of freedom hybrid magnetic bearing greatly reduces the volume of the magnetic bearing, obviously reduces the power consumption, and is applicable to electric principal axis and rotary principal axis systems needing suspending support.

The invention belongs to the electric power measuring technology and particularly relates to an induction type electric energy meter of which a rated maximum current Imax is eight times as large as a basic current Ib. The induction type electric energy meter comprises driving elements and rotation elements, wherein the rotation elements comprise a rotation shaft, a rotation disc and a lower shaft tip, the rotation disc and the rotation shaft are in movable connection, a lower portion of the rotation disc is provided with an upper magnetic ring, the upper magnetic ring and the rotation shaft are in movable connection, a top portion of the lower shaft tip is provided with a lower magnetic ring, the lower magnetic ring and the lower shaft tip are in fixed connection, the driving elements comprise a voltage element, a current element and a magnetic shunt, and the magnetic shunt is arranged between the voltage element and the current element. Performance of an integral machine formed through the induction type electric energy meter satisfies single-phase and three-phase electric energy meter requirements in related long-life technology electric energy meter standards in domestic and industries, and a flat straight curve can be acquired within a 5%Ib-800%Ib broad loadscope.

The invention relates to a rapid design method for a rotor tooth width of a bearing-free magnetic flux switching motor. By optimal design of the rotor tooth width, maximum counter electromotive forceamplitude of a power winding is achieved, so that minimum ampere turns of the power winding in a limited stator groove space is achieved, maximum ampere turns of a suspension winding is achieved, theoutput of a rotor suspension force is remarkably improved, and the pulse of the suspension force is reduced. By the method, a few calculation resources are required, low calculation quantity and shortcalculation consumption time are required, the ampere turns of the power winding in a stator groove is reduced to the greatest extent, the output capability of the suspension force is remarkably improved, and the pulse amplitude of the suspension force is obviously reduced.

The invention discloses a magnetic levitation linear guide rail of a differential parallel magnetic circuit structure, which belongs to the technical field of motors and solves the problems of large volume and heavy weight caused by more ampere turns of electric excitation of the conventional magnetic levitation linear guide rail. In the first scheme, a control coil is wound on the back of each iron core, all control coils are connected in series, n+1 iron cores are mutually arranged in parallel, a secondary winding is positioned in a C-shaped open space of all the iron cores, and two flat permanent magnets are fixed between the adjacent two iron cores and positioned above and below the secondary winding respectively; and in the second scheme, each iron core consists of C-shaped magnetic conducting yokes and three iron core poles, the openings of the two C-shaped magnetic conducting yokes are opposite, a flat permanent magnet is fixed between the corresponding end faces of the C-shaped magnetic conducting yokes respectively, each C-shaped magnetic conducting yoke is provided with two vertical straight-tooth iron core poles and a horizontal straight-tooth iron core pole, a control coil is wound on each iron core pole, and a secondary winding is arranged in the center of an opening formed by a primary winding. The invention is applied in the magnetic levitation linear guide rail.

The invention relates to an isochronism magnetic field shimming method of a superconducting cyclotron. A magnetic pole comprises two parts of a bottom magnetic pole and a shimming layer. The shimminglayer is connected and fixed with the bottom magnetic pole by screws, and can be dismounted and taken out from the bottom magnetic pole. A 45-degree oblique angle tapered cutter is used to perform isochronism magnetic field shimming on a chamfer of a side edge of the shimming layer through three-dimensional motion, working depth of the chamfer being changed with radius, and a chamfer depth curve can be obtained through an integral equation method and a least square method. The method can realize magnetic field isochronism shimming in a superconducting cyclotron, prevents a complicated finite element modeling process, and a shimmed magnetic field has good continuity and high precision. A chamfer processing method can reduce local magnetic field saturation of a magnet, reduce the number of coil ampere-turns and fluctuation of the magnetic field with temperature, and improve stability of the cyclotron for long-term operation.

The invention relates to a new superconducting hybrid magnet structure of a six-pole magnet and helix tube coils and is mainly applied to a superconducting magnet system of a minimum B magnetic field structure of an electron cyclotron resonance ion source for generating highly charged ions. The superconducting hybrid magnet device for generating the minimum B magnetic filed comprises a multi-pole magnet coil and the helix tube coils and is mainly characterized in that a first helix tube coil is embedded at an injection end of the multi-pole magnet coil; and the external side of the multi-pole magnet coil is coaxially provided with a plurality of the helix tube coils. The superconducting hybrid magnet device disclosed by the invention has the advantages that: one multi-pole magnet, which is formed by integral winding and has equidirectional current at the end sections, and a plurality of equidirectional current helix tube coils arranged inside and outside the multi-pole magnet form the minimum B magnetic field structure for generating field intensity with high magnetic mirror ratio. Compared with the traditional structure, the structure disclosed by the invention has the advantages that the end sections of the multi-pole magnet coil and the helix tube coils are arranged at the internal layer or the external layer of the same axial position and are only attracted with each other and not mutually repulsive because of the equidirectional current, so that the mechanical binding and fixing as required can be simplified considerably.