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 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 a mechanical device for realizing the on-line automatic balance of a rotating machine. The device is of a split type structure, and comprises two parts of a split type moving ring and a split type stationary ring, wherein a split type transitional sleeve is connected with a rotating main shaft and the moving ring, and plays a role of supporting the moving ring; the series mounting and fixation are realized for all split components of the stationary ring in the axial direction through stationary ring set bolts; a split structure is adopted by the stationary ring; the stationary ring enwraps the moving ring in the circumferential direction; the split surfaces of all the split components of the moving ring are connected respectively by adopting ways of a bolt, a plug-in type, a connecting piece and the like; all the split components of the moving ring are subjected to the series mounting and fixation in the axial direction through moving ring set bolts. By using the split type structure of the mechanical device, an automatic balancing device is enabled to not only be applicable to the development of a novel product but also be applicable to an in-service rotating appliance; the simplification and the convenience of an automatic balancing head in mounting and disassembly processes are promoted greatly; the assembly and the disassembly of the automatic balancing device can be completed without needing to disassemble an original device; the application and popularization of the automatic balancing device are facilitated.

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 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.

electromagnetic contactor comprising a winding (6) for generating a magnetic field, a magnetic circuit comprising a stationary portion (7) and a mobile portion (8), and an electronic board (11) comprising means of controlling the power supply to the winding (6), the electronic board (11) being arranged horizontally above the stationary portion (7) of the magnetic circuit. The mobile portion (8) passes through the electronic board (11) via an opening (12) in the board and slides into the winding, the contactor comprising an insulating casing including a rear portion intended to be fastened onto a support.

The invention discloses a magnetic suspension linear guide rail with a differential-type serial magnetic circuit structure, belonging to the technical field of motors. The invention solves the problems of large volume and large weight caused by large ampere turns of electrical excitation of the traditional magnetic suspension linear guide rail. Based on one technical scheme, two primary units are symmetrically arranged at the upper side and the lower side of a secondary unit; the opening side of a door-shaped primary iron core is relative to the secondary unit, a control coil is respectively wound on two vertical segmentations of the door-shaped primary iron core, a long strip permanent magnet is clamped and fixed between every two segmentations of the door-shape primary iron core, the jointed end surface of an elongated permanent magnet and the segmented iron core is the same as the end surface shape of the corresponding segmented iron core, all control coils are connected in series, and the secondary unit comprises a magnetic conductive yoke. Based on the other technical scheme, the magnetic conductive yoke is in an integrated structure or a two-segmentation structure, and the elongated permanent magnet is arranged on the surface of the magnetic conductive yoke in the integrated structure or is embedded between two segmentations of the magnetic conductive yoke in the two-segmentation structure. The invention is suitable for being used in the magnetic suspension linear guide rail.

The invention discloses a U-shaped combined lifting electromagnet. The U-shaped combined lifting electromagnet comprises electromagnetic units and a magnet yoke. The number of the electromagnetic units is even number and at least equal to 4. One end of an iron core of each one of the electromagnetic units is fixedly connected to the magnet yoke. The axis of the iron core is perpendicular to the magnet yoke. From the electromagnetic unit fixedly connected to the end of the magnet yoke, each two electromagnetic units form a U-shaped electromagnet, and magnetic polarities of the two adjacent electromagnetic units of each two adjacent U-shaped electromagnets are the same. The electromagnetic units are connected to the magnet yoke by bolts. The U-shaped combined lifting electromagnet has the characteristics of low energy consumption, light deadweight and maintenance convenience.

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 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.