35results about How to "Avoid loss of magnetism" patented technology

The invention discloses a stator electro-magnetic vernier motor. The stator electro-magnetic vernier motor is characterized in that the stator electro-magnetic vernier motor comprises a stator, wherein the stator is in a circular ring shape, a plurality of grooves are formed in the circumferential direction the wall of the ring body, an armature winding or an excitation winding is embedded in each groove, and projection parts among the grooves form stator teeth; a rotor, wherein the rotor is in a circular ring shape, a plurality of magnetic regulating blocks made of a magnetic conductive material are uniformly arranged in the circumferential direction of the ring body at intervals, the stator and the rotor are coaxially assembled in a sleeving manner, and an interval exists between the stator and the rotor. According to the invention, the armature windings and the excitation windings are embedded in the stator grooves, and the rotor magnetic regulating blocks are utilized, so that low-speed large torque is not provided by a vernier effect of a permanent magnet, the magnetic loss problem of a permanent magnet vernier motor in a specific operation environment is solved, the efficiency is improved, and the cost is saved.

The invention provides a wave energy power generation device. A floater and a conical end cover of the wave energy power generation device are located at the two ends of a machine shell, and the floater, the conical end cover and the machine shell form a sealed cavity. A stator, a rotor, springs and a rotor sliding rail are sealed in the machine shell. The stator is cylindrical, located on the inner side of the machine shell and formed by alternately stacking a plurality of stator units which are the same in thickness and a plurality of stator magnetism isolating rings which are the same in thickness in the axial direction. Stator teeth are uniformly distributed on the inner side of each stator unit. A coil is wound on each stator tooth. A square hole is formed in the top of each stator tooth. A square radially magnetized permanent magnet is embedded in each square hole. The magnetic poles of the permanent magnets are alternately arranged in the circumferential direction. The rotor is cylindrical, located on the inner side of the stator and formed by alternately stacking a plurality of rotor magnetism conducting rings which are the same in thickness and a plurality of rotor magnetism isolating rings which are the same in thickness in the axial direction. The rotor and the springs are installed on the rotor sliding rail. The rotor can slide up and down along the rotor sliding rail. The rotor sliding rail and the machine shell are concentric and coaxial, and the two ends of the rotor sliding rail are fixed to the floater and the conical end cover correspondingly. The springs are located on the two sides of the rotor and connected with the floater and the conical end cover correspondingly.

The invention discloses an excitation adjustable type permanent magnet synchronous motor. The excitation adjustable type permanent magnet synchronous motor comprises a rotor, the rotor comprises a plurality of paired permanent magnet assemblies, and each permanent magnet assembly comprises a cylindrical permanent magnet, a cover plate and a rotary driving mechanism. Parallel magnetization is adopted in the cylindrical permanent magnets, and the cylindrical permanent magnets are closely arranged in parallel. The appearances of the cover plates are of a cuboid structure, the cover plates are made of permeability magnetic materials, and the cylindrical permanent magnets are arranged in the cover plates to form the cuboid-shaped permanent magnets. The rotary driving mechanisms are connected with the cylindrical permanent magnets, and when the rotor rotates, the cylindrical permanent magnets are driven to rotate around the axes of themselves so that the magnetic flux of the permanent magnet assemblies can be reduced. The rotor structure of a traditional permanent magnet synchronous motor is changed, magnetic poles of the permanent magnets are pulled by an electromagnet in the motor to rotate, the excitation magnetic flux can be adjusted by itself, and therefore large demagnetizing current components do not need to be applied at high speed, and motor efficiency is improved.

The invention discloses a rotor punching sheet of a high-speed permanent magnet motor. The rotor punching sheet comprises punching sheet inner slots (1), punching sheet combined holes (2), lightening holes (3) and a rotor shaft hole (4), wherein the punching sheet inner slots (1) are distributed on an outer circumferential surface of the punching sheet, the lightening holes (3) are arranged around the rotor shaft hole (4) in a surrounding manner, the punching sheet combined holes (2) are arranged among the lightening holes (3), and the rotor shaft hole (4) is arranged at the center of the punching sheet. According to the rotor punching sheet of the high-speed permanent magnet motor disclosed by the invention, a permanent magnet block is embedded in the punching sheet inner slot so that the permanent magnet block can be prevented from falling off during a high-speed operation; due to an integrated punching sheet structure, a magnetic flux forms closed circulation so as to prevent the permanent magnet block from loss of excitation, and the service life of the permanent magnet motor is prolonged; and reverse installation of the punching sheet is avoided by utilizing asymmetrical webs in the punching sheet.

The invention relates to the technical field of high-voltage permanent magnet synchronous motors, and discloses a rotor permanent magnet series distribution-linked high-voltage permanent magnet synchronous motor, which comprises a motor shell, a stopper is fixedly connected with the motor shell, a first fixing seat is fixedly connected with stopper, a second fixing seat is fixedly arranged on theinner wall on the right side of the motor shell. The rotor permanent magnet series distribution-linked high-voltage permanent magnet synchronous motor can make the waveform of the counter electromotive force achieve the best effect as long as the design of each segment length is appropriate, the useless harmonic generated by the stator is minimized, the harmonic loss is minimized, the motor achieves high efficiency, the manufacturability is good, the rotor punching die is most simple, and each magnetic steel is easy to install due to small volume, and the design level and the process level ofthe high-voltage permanent magnet motor become reliable and efficient, so that the design of this type of motor becomes feasible, and meanwhile, the motor can be applied to various complex occasions.

The invention relates to a melt spinning technology and belongs to the field of spinning. According to the melt spinning technology, magnetic force parallel to the direction of the ground is applied to a melt in a wire drawing process, and the melt is prepared with a method comprising steps as follows: step 1, a-Al2O3 coated magnetic material particles are prepared; step 2, the a-Al2O3 coated magnetic material particles obtained in step 1 are mixed with other fiber raw materials, and a mixture is molten. With adoption of the technology and a device, magnetic fibers with consistent magnetic orientation can be obtained.

An electromagnetic force driving mechanism of an SF6 high voltage circuit breaker belongs to the technical field of power transmission and transformation equipment. The mechanism comprises the SF6 high voltage circuit breaker, a connecting rod and the electromagnetic force driving mechanism, wherein, a transmission rod of the electromagnetic force driving mechanism is connected with the connecting rod; the electromagnetic force driving mechanism comprises a primary core, a secondary core, a main permanent magnet, an auxiliary permanent magnet, a magnetism isolating material, a winding coil and the transmission rod; the secondary core of the electromagnetic force driving mechanism is subjected to effects of electromagnetic force in a magnetic field, so as to drive the moving contact of the SF6 high voltage circuit breaker to conduct a switching/closing movement; and the auxiliary permanent magnet of the electromagnetic force driving mechanism causes a switching/closing position of the high voltage circuit breaker to be kept fixed. The mechanism has the advantages that by adopting the auxiliary permanent magnet, the switching/closing position of the high voltage circuit breaker is caused to be kept fixed; the mechanism has a small mass and a small inertia, and is easy to control; the winding coil is arranged in the secondary core; and the secondary core moves to drive the winding core to move, thereby preventing loss of excitation of the mechanism.

The invention relates to the field of novel materials, in particular to permanent magnet material cutting equipment. During production of permanent magnet materials, the materials may be demagnetized by adverse factors such as vibrations and high temperature generated by a conventional cutting way for modification of processed materials. To solve the problems, the permanent magnet materials are put into a clamping assembly; the clamping assembly clamp circular rod materials of different diameters at different angles, so that cutting under various conditions is convenient; vibrations are not generated when the clamping assembly cuts, so that demagnetization is effectively prevented; the assembly can be pushed and pulled to adjust the cutting length, and a cutting assembly can cut the materials at a uniform speed and a low speed, so that vibrations are reduced to be the smallest; and saw blades are cooled by cooling liquid all the time during cutting, and the sprayed-out cooling liquid is re-added into a cooling liquid box after being filtered and cooled to a proper temperature, so that the materials are prevented from being demagnetized due to loss of cooling effect at a high temperature of the cooling liquid while resources are saved.

The invention discloses a judgment method for position sensorless control starting stalling of a permanent magnet synchronous motor. The judgment method comprises the following steps: establishing a voltage equation of the permanent magnet synchronous motor under an actual rotation dq coordinate system; based on a voltage equation, under a preset consistent operation frequency, generating a three-phase sine wave current to form an active rotating magnetic field in two modes of taking a d-axis voltage as 0 and a q-axis voltage as a preset voltage and taking the d-axis voltage as the preset voltage and the q-axis voltage as 0, so as to make the motor normally operate in an open loop under the condition of no locked-rotor, and respectively calculating d-axis current and q-axis current of the motor in the two modes; and according to the relationship between the dq-axis current and the current preset value of the motor in the two modes, judging whether locked-rotor occurs at the starting stage of the motor. Whether the motor is in the locked-rotor state or not in the starting stage is judged by applying two groups of dq-axis voltage and analyzing the magnitude of the obtained current, and the problems of motor excitation loss, power module damage and the like caused by motor locked-rotor and current overshoot can be avoided.

The invention relates to an integrated vertical-axis wind turbine which comprises an upper cover, a lower cover, blades, a power generator and a shaft body, wherein the lower cover is arranged below the upper cover; the blades are arranged between the upper cover and the lower cover; two ends of each blade are fixedly connected with the upper cover and the lower cover correspondingly; the power generator is arranged at the center of the upper end of the lower cover; the lower part of the power generator is fixedly connected with the lower cover through a bolt; the shaft sequentially penetratesthrough the upper cover, the power generator and the lower cover from top to bottom, and is connected with the upper cover, the power generator and the lower cover through a plurality of bearings; and the bearings all sleeve the shaft body. Compared with the prior art, the integrated vertical-axis wind turbine provided by the invention achieves the integrated design of a wind wheel and a permanent magnet power generator of a conventional wind turbine. Accordingly, the structure of the integrated vertical-axis wind turbine can be simplified, the integrated vertical-axis wind turbine can rotateand produce electricity energy as long as the internal cogging torque of a motor is overcome, the mechanical abrasion caused by a transmission device and the consumption of wind energy can be reduced, and the wind energy utilization ratio can be effectively improved.

The invention belongs to the field of sheet preparation and relates to a thermoplastic resin composite sheet production device and process. The thermoplastic resin composite sheet production device comprises a substrate forming mechanism and at least one composite layer forming mechanism. Each composite layer forming mechanism is integrally positioned above a conveying belt (202) and comprises a magnetic fiber laying device, a magnetic field generating unit (402) and a cooling roller (303) from one side close to a die head I (101), wherein the magnetic fiber laying device is used for laying fibers on substrate slurry (501), the magnetic field generating unit (402) is capable of generating a magnetic field perpendicular to the ground, and the cooling roller (303) is used for receiving composite layer slurry (502) from a die head II (102) to enable cooling of the composite layer slurry (502) on the cooling roller (303). The thermoplastic resin composite sheet production device is simplein structure and easy in operation.

The invention relates to a fiber manufacturing process, and belongs to the field of fiber manufacturing. The fiber manufacturing process is a melt spinning process. A melt is prepared by the followingsteps of firstly, preparing a-Al203 wrapping magnetic material particles; secondly, mixing the a-Al203 wrapping magnetic material particles obtained in the first step with other fiber materials, andthen melting. The melt comprises magnetic particles, and the magnetic particles are the a-Al203 wrapping magnetic material particles; the a-Al203 with high intensity is wrapped outside the magnetic material, on one hand the intensity and tenacity of the fiber can be improved, on the other hand, the a-Al203 has high melting point, the magnetic particles are wrapped inside the a-Al203, the magnetismloss of magnetic substances inside the a-Al203 caused by acting with other fibers can be avoided.

The invention discloses a synchronous motor excitation system which comprises a redundant PLC, a first intelligent voltage regulator, a second intelligent voltage regulator and a synchronous motor. The first intelligent voltage regulator and the second intelligent voltage regulator are connected in parallel and then are connected with the synchronous motor, and the first intelligent voltage regulator and the second intelligent voltage regulator are both connected with the redundant PLC; the first intelligent voltage regulator is used for stopping working when a fault occurs and sending a fault signal to the redundant PLC; and the redundant PLC is used for starting the second intelligent voltage regulator to work when the fault signal is received. The stability of the excitation system of the synchronous motor can be improved, and excitation loss of the synchronous motor caused by faults of the voltage regulator is avoided.