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

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 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 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.