12 results about "Magnetic circuit" patented technology

A brushless motor includes an external stator where a magnetic circuit is electrically formed by winding electric wires around an iron core; a bus bar bundling the electric wires and forming an external input terminal; and an internal rotor formed by integrating a permanent magnet and rotatably supported through a bearing with respect to the external stator, wherein an insulation plate is held on one end of the external stator and attached thereto a magnetic pole sensor detecting a magnetic pole of the permanent magnet.

The present invention relates to the technical field of electroacoustic products. Disclosed is a miniature speaker. The miniature speaker comprises an upper housing and a lower housing combined together. A vibration system and a magnetic circuit system are accommodated in the space defined by the upper housing and the lower housing. The upper housing is disposed close to the vibration system. The miniature speaker also comprises a hearing-aid voice coil. The hearing-aid voice coil is fixed to the upper housing and is located at the inner side of the upper housing. The miniature speaker of the present invention solves the problem of poor acoustics caused by collision of a lead wire of a vibrating voice coil with a hearing-aid voice coil of a miniature speaker in the prior art, and the miniature speaker of the present invention has good acoustic performance and a better hearing-aid effect.

The invention relates to a direct-drive composite permanent magnet motor with a magnetic transmission and dual-stator structure. According to the direct-drive composite permanent magnet motor with the magnetic transmission and dual-stator structure, a novel permanent magnet motor with a dual-stator hollow-rotor structure and a magnetic gear transmission technology are integrated so as to directly realize the mutual conversion of electric energy and low-revolving-speed large-torque mechanical energy, and the novel direct-drive composite permanent magnet motor can be widely applied to the wind power generation, hydraulic power generation, electric automobiles, ship drive and the field of transmission of other industries needing direct drive. The direct-drive composite permanent magnet motor is characterized in that an integrated structure is formed in a manner that a disk-shaped magnetic transmission gear pair I and a dual-stator-structure permanent magnet motor II are combined, the variable-speed transmission of high-speed and low-speed mechanical kinetic energies is realized by using the magnetic transmission gear pair I with transverse magnetic fields, the electromechanical energy conversion is realized by using the dual-stator-structure permanent magnet motor II with radial magnetic fields, a magnetic circuit structure is of a closed magnetic circuit which is formed in a manner that an inner stator and an outer stator are directly connected between two hetero-polarity permanent-magnet poles of a hollow rotor in series, the inner stator, the outer stator and the rotor are of a radial concentric structure, and two air gaps exist.

An ultrathin loudspeaker-type radiator comprises a heat conduction chamber, a vibrating diaphragm, a voice coil and a magnetic apparatus, wherein the magnetic apparatus generates contrary magnetic loops at two side edges of the voice coil, and the magnetic loops are vertical to the side edges, the voice coil divides the heat conduction chamber into two air chambers, side walls of the two air chambers both have air vents, the voice coil and the vibrating diaphragm are fixed into one piece, a terminal of the voice coil extends out of the heat conduction chamber and is used for receiving input of alternating current, and the magnetic apparatus acts with the alternating current in the voice coil to generate an Ampere force to drive the voice coil and the vibrating diaphragm to vibrate in the heat conduction chamber so as to exhaust or intake air in the two air chambers from the correspondingly air holes. The invention adopts the magnetic apparatus which generates contrary magnetic loops, vertical to the two side edges of the voice coil, at the two side edges of the voice coil to adapt to a condition that current in two side edges are contrary, the intensity of a magnetic field of the magnetic apparatus in the horizontal direction is enhanced, stronger magnetic performances under the same power are achieved, the vibrating strength of the voice coil is improved, the heat radiation capacity of the radiator is improved, and the technical support is provided for an ultrathin structure.

The invention discloses a self-coupling step-down compensation integrated soft start device which couples the two functions of a self-coupling transformer and a magnetic-valve type controllable reactor together through an ingenious circuit and magnetic circuit design, and relates to the start-up of an extra-high/ultra-high capacity high-voltage motor. A high-voltage side magnetic core and a low-voltage side magnetic core are completely the same in structure, the high-voltage side magnetic core is composed of a first iron core, a second iron core and a first side yoke, a first coil and a second coil are wound on the first iron core, a third coil and a third coil are wound on the second iron core, and the other end of each of the first coil and the third coil is connected with the other end of each of the second coil and the fourth coil in parallel; one end of a high-voltage side winding is connected with the positive pole of an input power supply, the other end of the high-voltage side winding is connected with the input end of a low-voltage winding and accessed to one end of a motor, and the other end of the low-voltage side winding is connected with the negative pole of the power supply and the other end of the motor. The self-coupling step-down compensation integrated soft start device is capable of smoothly changing the impedances of a high-voltage side and a low-voltage side, low in start current, small in size, stable in start performance, fast in response speed, and long in service life.

The invention relates to a microwave heating dryer with adjustable power. At least two microwave radiation circuit units are installed in the dryer. Each microwave radiation circuit unit consists of a contactor, a high-voltage transformer and a corresponding set of three magnetic The three input coils of the high-voltage transformer are connected to the three output terminals of the contactor correspondingly, and the three output coils of the high-voltage transformer are correspondingly connected to the above three magnetrons. In each microwave radiation circuit unit, at least one The electromagnetic coil of the contactor of the microwave radiation circuit unit is connected with a power controller circuit for intermittent power supply. It can effectively improve the reasonable matching between the microwave output power and the load, improve the energy utilization rate and (heating) drying quality; at the same time, it is convenient to realize the control of the total power of (heating) drying, so as to facilitate the processing of different types of materials and different treatments. Reasonable operation of the microwave (heating) dryer under certain circumstances.

The invention discloses a three-phase 18/16-pole bearingless switched reluctance motor. According to the invention, torque windings on torque teeth are used for generating output torque, and suspension windings on the suspension teeth are used for generating radial suspension force; due to the fact that the pole arc angle of the suspension teeth is equal to a rotor periodic angle, the inductance of the suspension windings is constant, and the motion electromotive force of the suspension windings is zero, so the suspension winding does not generate torque, and then natural decoupling of the torque and the suspension force can be achieved structurally; a traditional switched reluctance motor driving mode is adopted for rotation control, and suspension control is similar to a traditional electromagnetic bearing control mode, so control is simple, and good suspension performance is obtained; only one coil is wound on each tooth, so a structure is simple, machining and assembling are convenient, and a multi-rotor-tooth-number structure facilitates reduction of torque pulsation and increase of output power; moreover, torque and suspension magnetic circuits are both of a short magnetic circuit structure, so iron core loss can be reduced; and the magnetic flux direction of a stator yoke part does not change when the motor operates, so the stator iron core loss can be further reduced.

The invention discloses a controllable magnetic field modulation axial magnetic flux generator combined with a magnetic suspension and belongs to the technical field of offshore floating type vertical axis wind power generation. A double-stator structure is adopted; and the generator consists of an upper stator, a lower stator, a rotor, a permanent magnetic suspension and an electromagnetic suspension. The rotor is provided with a modulation gear, magnetic field modulation is achieved, and the mass of the rotor is reduced, so that the rotor can suspend, and inertia and rotational inertia can be controlled; the upper stator is composed of a generator armature winding and an iron core; the lower stator is a permanent magnet and excitation combined structure; a magnetic field passes through the upper and lower stators and passes through the rotor to form a magnetic path; an air gap and rotor magnetic resistance are basically not changed, so that suspension control and adjustment have no influence on the generator. Hybrid excitation is realized; when an offshore wind power system is completely in a black start state, the permanent magnet of the lower stator can excite the armature of the upper stator after being modulated by the magnetic field under the driving of wind power, and after electric energy is gradually gathered, electrical excitation is applied to realize power output, and the electromagnetic suspension can realize dynamic suspension control along with wind speed change and motor modulation operation.

The embodiment of the invention provides a sound unit and a mobile terminal, the sound unit comprises a magnetic circuit assembly and an actuating piece, the actuating piece is located below a displayscreen of the mobile terminal and attached to the display screen, and the actuating piece can move under the magnetic excitation of the magnetic circuit assembly and drives the display screen to vibrate and produce sound. The actuating piece is arranged below the display screen and is attached to the display screen, so that on one hand, the total height of the sound unit can be reduced under thecondition that the maximum stroke of the actuating piece moving along the axis of the actuating piece is not changed, and on the other hand, when the actuating piece moves under the magnetic excitation of the magnetic circuit assembly, the display screen can be driven to move to push air and radiate sound waves outwards, so that screen sounding is achieved, and thinning of the mobile terminal is facilitated.

The invention relates to the technical field of motors, and particularly discloses a permanent magnet motor rotor core and a motor. The permanent magnet motor rotor iron core comprises an iron core body and a plurality of magnetic steels, wherein the iron core body is provided with a plurality of magnetic pole units which are arranged at intervals along the circumferential direction of the iron core body; each magnetic pole unit comprises a V-shaped first magnetic steel groove, a V-shaped second magnetic steel groove and a U-shaped third magnetic steel groove, the first magnetic steel groove is arranged close to the outer edge of the iron core body, the third magnetic steel groove is arranged close to the center of the iron core body, and the second magnetic steel groove is arranged between the first magnetic steel groove and the second magnetic steel groove; and magnetic steel is arranged in each magnetic steel groove. According to the designed magnetic circuit, the magnetism gathering capacity of the motor can be improved, meanwhile, the salient pole ratio of the motor is increased, the reluctance torque of the motor is improved, then the torque density of a constant torque area and a weak magnetic area of the motor is effectively improved, and the air gap flux density waveform and the counter potential waveform can be improved. The magnetic circuit structure can flexibly arrange the position of the magnetic isolation bridge and effectively improve the limit rotating speed of the motor rotor.