148 results about "Electropermanent magnet" patented technology

Numerous arrangements for permanent magnets are disclosed that can focus the flux produced by the magnets. Depending on the particular application in which the disclosed designs and techniques are used, efficiency and reliability may be increased by minimizing flux leakage, increasing peak flux density, and shaping the flux fields to improve the effective coercivity of the flux focusing permanent magnet arrangement when loaded, and to achieve customized voltage and current waveforms. The disclosed magnet assemblies may be incorporated into a machine, such as a motor / generator, having windings and may be disposed for movement relative to the windings. The magnet assembly may be mounted on a support formed of one or more ferromagnetic materials, such as a back iron The disclosed flux focusing magnet assemblies may be formed using a variety of manufacturing methods.

Numerous arrangements for permanent magnets are disclosed that can focus the flux produced by the magnets. Depending on the particular application in which the disclosed designs and techniques are used, efficiency and reliability may be increased by minimizing flux leakage, increasing peak flux density, and shaping the flux fields to improve the effective coercivity of the flux focusing permanent magnet arrangement when loaded, and to achieve customized voltage and current waveforms. The disclosed magnet assemblies may be incorporated into a machine, such as a motor / generator, having windings and may be disposed for movement relative to the windings. The magnet assembly may be mounted on a support formed of one or more ferromagnetic materials, such as a back iron. The disclosed flux focusing magnet assemblies may be formed using a variety of manufacturing methods.

The invention discloses an electric grinding device which comprises a swing motor and a grinding head driven by the swing motor. The swing motor comprises a U-shaped magnet yoke, four permanent magnets and a swing arm. Two supporting legs of the U-shaped magnet yoke are wound by coils. The end faces of the two supporting legs can produce alternating magnetic poles under the control of a control circuit. The four permanent magnets comprise the first permanent magnet, the second permanent magnet, the third permanent magnet and the fourth permanent magnet which are sequentially distributed on the same circle with the supporting point as the circle center. The radial end face of the first permanent magnet and that of the fourth permanent magnet are the same in polarity. The control circuit produces alternating pulses with the adjustable pulse width, and the movement direction of the permanent magnets alternately changes, so that reciprocated swing is formed, the swing arm drives the grinding head to slightly swing at a high speed in a reciprocated mode, and the body surfaces (such as skin and fingernails) of the living bodies (such as the human body and animals) are cleaned.

The invention discloses a dual-stator hybrid permanent-magnet memory motor. The dual-stator hybrid permanent-magnet memory motor comprises a first stator, a second stator, a rotor, an U-shaped statorcore, an Al-Ni-Co permanent magnet and a NdFeB permanent magnet, wherein the stators and the rotor are of salient pole structures, the first stator and the second stator are opposite in positions, therotor is arranged between the two stators, the U-shaped stator core is uniformly wound to form a round shape, the two permanent magnets are embedded between two stator teeth, the NdFeB permanent magnet is near to the rotor, the permanent magnet on the single stator are alternatively magnetized along a circumferential direction, and the magnetization directions of the permanent magnets at oppositepositions of the two stators are opposite. By the dual-stator hybrid permanent-magnet memory motor, the power density of the motor can be effectively improved, the magnetization states of the permanent magnets are changed by applying a pulse current to a magnetic adjustment coil so as to expand a running range of the motor, and the problem of excessively large torque among tooth grooves of the motor is effectively solved.

A surface magnet type rotor and an inner magnet type rotor having good motor characteristics in which bonding strength is high between a magnet section and a soft magnetic yoke section, and structural reliability is high even in high speed use, and its producing method. The rotor comprises an anisotropic bond magnet section and a soft magnetic section wherein the anisotropic bond magnet section is preformed in magnetic field and then formed to be integrated with the soft magnetic section in nonmagnetic field. Subsequently, it is heat hardened to produce a surface magnet type rotor. Magnet units, each having a magnetic pole composed by bonding a pair of permanent magnets such that the directions of magnetization become symmetric with respect to the bonding surface, are linked such that magnetic poles of different polarities appear alternately on the magnetic action surface thus forming an anisotropic magnet body. Good motor characteristics can be attained by setting an angle to 5-40° between the direction of magnetization of the permanent magnet and a diametral direction passing the bonding surface.

A direct-acting bidirectional proportion electromagnet comprises a magnetism isolating ring, a first guide sleeve, a second guide sleeve, an armature, a push rod, a control coil and a coil retainer, wherein a groove is formed in the circumferential direction of the coil retainer which is used for winding the control coil to form a current excitation source; cylindrical pole shoes of the first guide sleeve and the second guide sleeve are opposite to a cylinder outside the armature and are an airgap away from each other to form a left pole shoe pair and a right pole shoe pair, of which the airgaps are equal; the magnet poles of the same nature of a first permanent magnet and a second permanent magnet are respectively attracted by the left end and the right end of the armature; the other magnet pole of the first permanent magnet attracts a first magnetic-conductive part, and the other magnet pole of the second permanent magnet attracts a second magnetic-conductive part; the two poles of the first and second permanent magnets, together with the first guide sleeve and the second guide sleeve, form a first permanent magnet field and a second permanent magnet field respectively through the first magnetic-conductive part or the second permanent magnet; the armature push rod is connected with the armature; the first guide sleeve and the second guide sleeve are respectively at two sides of the magnetism isolating ring and are connected with the magnetism isolating ring.

A three-phase permanent magnet brushless motor comprises a stator having three-phase windings, and a rotor having a permanent magnet with a plurality of poles for serving as a field magnet. The stator comprises a stator core which includes a powder core that is compacted at a high density in at least teeth thereof. A combination of the number of magnetic poles of the rotor with the number of slots of the stator satisfies a condition that a least common multiple of the number of slots and the number of magnetic poles is 60 or more in a region in which the number of magnetic poles is 16 or less, and the number of slots is 12 or less. The powder core is made by compacting magnetic powders to have a green density of 7.5 g / cm3 or higher.