862results about How to "Increased torque density" patented technology

The invention relates to a three-freedom degree Halbach array permanent magnetism spherical synchronous motor, belonging to spherical electric machine manufacturing technical field, which comprises a base, a support bearing positioned on the base, a spherical rotor body, an outside stator, an output shaft, the spherical rotor body comprises a hollow spherical rotor yoke made by non-guide magnetism materials and a Halbach array permanent magnetism body, the output shaft is through the upper of the hollow spherical rotor yoke and is fixingly connected with the hollow spherical rotor yoke, column-shaped slots are provided around a cycle of the hollow spherical rotor yoke equator, the Halbach array permanent magnetism body are fixed evenly on one cycle of the rotor yoke equator along the column-shaped slots, the contact surface of the rotor yoke lower and the support bearing is ring-shaped arc surface; the outer stator comprises a stator casing and multi-row coils, an adjustable fixing bearing is provided on the lower side of the stator casing cover. The spherical synchronous motor of the invention can realize three-freedom degree movement, has simple mechanical structure and improved dynamic and static performance of the drive system.

The invention discloses a high-torque-density permanent magnet reluctance synchronous motor rotor structure, which comprises a central rotating shaft and a rotor core, wherein P groups of through slots are evenly formed in the rotor core along the circumferential direction, each group of through slots includes three layers of U-shaped through slots formed along a radial direction of the rotor core at intervals, and a permanent magnet is embedded in each of two wings of the middle U-shaped through slot; and the middle U-shaped through slot among the three layers of U-shaped through slots is of a symmetric structure, and the outer-layer and inner-layer U-shaped through slots are each of asymmetric structure. The high-torque-density permanent magnet reluctance synchronous motor rotor structure can change torque characteristics of a built-in permanent magnet synchronous motor, makes the maximum synthesized torque fully utilize a permanent-magnet torque component and a reluctance torque component, and increases torque density of a motor.

The invention aims at disclosing a rotor of a permanent magnetic composite excitation synchronous motor. The rotor comprises a double-layer embedded type rotor sheet, first magnetic steel grooves are formed in the outer side of the rotor sheet, second magnetic steel grooves are formed in the inner side of the rotor sheet, magnetic bridges are arranged between the second magnetic steel grooves, and magnetic steel is arranged in the first magnetic steel grooves and the second magnetic steel grooves. Compared with the prior art, different permanent materials are embedded in the rotor sheet according to a certain rule to form the rotor, the usage number of rare-earth permanent magnetic materials is effectively reduced, the effect of the temperature on a motor air-gap magnetic field is reduced, the excitation stability is improved, the utilization rate of salient pole torque of the motor is increased, the torque density of the motor is increased, and the purpose of the rotor is achieved.

The invention relates to a direct-drive combined motor which comprises a self-control permanent-magnet motor and a concentric magnetic gear. The permanent-magnet motor and the magnetic gear are integrated by adopting the sleeve-type structure or the axial series connection structure. The combined permanent-magnet motor can automatically realize the high-speed low-torque power transfer and the low-speed high-torque power transfer therein without a mechanical gear case. The motor can serve as an electric motor and a power generator.

The invention provides a structure for a modular motor stator and end part overlapping fractional slot windings of the modular motor stator. The number of stator slots and the number of winding pole pairs are set to be 2Z and p respectively, wherein the stator slots are evenly distributed on the circumference; the stator comprises two sets of three-phase symmetric AC windings; the windings are evolved from traditional single-layer concentrated fractional slot windings; the arrangement of each set of windings is the same as that of the traditional single-layer concentrated fractional slot windings with Z slots and p pole pairs; the staggered angle of two sets of windings is one half of a coil span mechanically; overlapping regions at the end parts of the windings are distributed on the circumference of the stator at intervals; and modularization can be achieved by cutting the stator in the non-overlapping regions at the end parts of the windings. The structure can greatly reduce the non-working tooth harmonic content in magnetomotive force of the traditional concentrated fractional slot windings, so that the motor loss can be reduced; torque pulsation is stabilized; the noise is reduced; meanwhile, the structure has the advantage that the motor stator with the concentrated fractional slot windings can be modularized; manufacturing, transportation and assembly of a large motor are facilitated; the interphase mutual inductance is small; and improvement of the fault-tolerant capability of the motor is facilitated.

A high torque active mechanism for an orthotic and / or prosthetic joint using a primary brake which can be provide by magnetorheological (MR) rotational damper incorporating and an additional friction brake mechanism driven by the braking force generated by the MR damper. This combination of MR damper and friction brake mechanism allows an increase in torque density while keeping the same level of motion control offered by the MR damper alone. The increased torque density achieved by this high torque active mechanism allows to minimize the size of the actuating system, i.e. its diameter and / or breath, while maximizing its braking torque capability. In this regard, the friction brake mechanism is advantageously positioned around the MR damper, such that the dimension of the package is minimized.

The invention discloses a coaxial magnetic gear comprising an external rotor, a static magnetic ring and an internal rotor which are lined from outside to inside and share the same axis. The external rotor is a circular magnetic conductor, and external rotor convex poles which are lined with equal spacing are arranged on the inner ring of the external rotor; the static magnetic ring is fixedly arranged between the internal rotor and the external rotor, and comprises permanent magnets and non-permanent magnets which are lined at intervals; internal rotor convex poles are lined on the outer ring of the internal rotor with equal spacing, and internal rotor permanent magnet bodies are arranged on the outer ring of the internal rotor; the internal rotor can be also in other structural forms capable of producing effective N-S magnetic poles; and in order to ensure the normal rotation of the internal rotor and the external rotor, air gaps are left between the three parts. Through the convex pole structure of the external rotor, the coaxial magnetic gear enables a static magnetic ring magnetic field to modulate a series of harmonic rotation magnetic fields on an inner air gap side, the number of the polar pairs of the selected internal rotor permanent magnet bodies is the same with that of the pole pairs of a required harmonic magnetic field, and the stable torque transmission is realized by the coupling action of the polar pairs of the selected internal rotor permanent magnet bodies and the pole pairs of a required harmonic magnetic field. The magnetic gear has the characteristics of high torque density, high mechanical strength of the external rotor, and convenience in processing and manufacturing.

The invention relates to an electrical machine of the transversal-flux type. The machine comprises a stator and a movable element. The stator has a plurality of stator elements with magnetic flux conductors and an electric winding extending in a closed winding path through each magnetic flux conductor. The movable element comprises a number of permanent-magnet members and is movable in relation to the stator along a movement path. The winding path comprises a first current-carrying section extending along the movement path. Each magnetic flux conductor forms, together with one of the permanent-magnet members, a closed magnetic flux circuit around said current-carrying section. Each permanent-magnet member comprises a primary magnet with a magnetic direction across the movement path. Adjacently located permanent-magnet members are separated from each other by an intermediate member comprising at least one secondary magnet that has a magnetic direction essentially across the magnetic direction of the primary magnet.

The invention relates to a magnetism transmission gear pair of a novel transverse magnetic field, which can be widely applied to wind power generation, electric cars, ship drive and other industrial transmission fields requiring direct drive. The magnetism transmission gear pair is characterized in that a driving wheel and a driven wheel of the magnetism transmission gear pair are of a flat disk shape, 2pr driving wheel permanent magnets 3 are distributed on the driving wheel, and 2ps driven wheel permanent magnets 7 are distributed on the driven wheel; a ferromagnetic magnetic modulation grid 6 playing a role of modulating an air-gap magnetic field is arranged between the driving wheel and the driven wheel, air gaps are reserved between the ferromagnetic magnetic modulation grid 6 and the end surfaces of the driving wheel and the driven wheel, and the ferromagnetic magnetic modulation grid 6, the driving wheel and the driven wheel have no mechanical contact and are distributed along the same axis; the air-gap magnetic field Bg passes through an air-gap plane along a route parallel to a rotation axis to form a transverse magnetic field of the magnetism transmission gear pair; and during working, power speed change transmission without mechanical contact and friction is realized by utilizing a principle of heteropolarity attraction of an N pole and an S pole of a permanent magnet material.

The invention relates to a direct drive type sinusoidal magnetic field composite permanent magnet motor which comprises a self-control type permanent magnet motor and a magnetic field modulating type magnetic gear, wherein both the permanent magnet motor and the magnetic gear adopt a sinusoidal magnetizing permanent magnet structure and are concentrically integrated into a double-stator double-rotor structure, i.e. an outer rotor and an outer stator constituting the magnetic gear and an inner rotor and an inner stator constituting the permanent magnet motor are integrated into a concentric type structure by adopting a sleeve type structure. The invention has the advantages of compact structure, high torque density, high efficiency, high power factor, inherent overloading protection characteristic, and the like.