54results about How to "Easy to demagnetize" patented technology

The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrating windings with the following structure so that permanent magnet (6) is hard to subjected to demagnetization magnetic field: 0.3 Lg<La≦2.0 Lg, where La is a clearance between teeth of stator (1), and Lg is an air-gap between stator (1) and rotor (2), and yet outer walls of both ends of the permanent magnet (6) disposed within rotor (2) in a rim direction are tapered toward inside from a rotor rim in a radial direction and thus form recessed section on the outer walls of the magnets. As a result, withstanding force against demagnetization is expected to increase.

A rotor for an electric machine excited by magnetic poles formed by one or more embedded permanent magnets includes a magnetic body and the one or more embedded permanent magnets associated with the magnetic body defining first magnetic poles and second magnetic poles of alternating magnetic polarity along a rotor direction. For at least one of the one or more embedded permanent magnets a rotor segment is arranged between the one or more embedded permanent magnets and a first surface of the magnetic body. At least one retainer element connects the rotor segment to a portion of the magnetic body.

An elevator, particularly for transporting passengers, has an elevator car guided in an elevator shaft a direct drive motor. The drive motor includes an active primary part at the elevator car and a passive secondary part that is fixed in the elevator shaft and is spaced from the primary part by an air gap. In order to achieve a high power capability, the drive motor is configured as a transverse flux motor that moves the primary part linearly relative to the secondary part under the influence of an electromagnetic propulsive force. The secondary part has at least one rail made of a soft magnetic material and subdivided into a plurality of segments having a predetermined length. The segments are fixed to a wall of the elevator shaft by intermediate elements.

A totem-pole PFC and a current-sampling unit of the totem-pole PFC are provided. The totem-pole PFC is electrically connected to an AC power source and a DC-to-DC converter, and is electrically connected to a load through the DC-to-DC converter. The current-sampling unit has a first sampling switch and a second sampling switch. The first sampling switch and the second sampling switch are controlled to be turned on and turned off so that a magnetizing current flows through the magnetizing inductor when a magnetizing inductor is magnetized and a demagnetizing current does not flow through the sampling resistor when the magnetizing inductor is demagnetized, thereby increasing the demagnetization efficiency and overcoming superimposed operations to improve current detection and increase conversion efficiency of the power conversion.

The invention belongs to the technical field of demagnetization equipment, in particular to an efficient demagnetization device for a computer software storage device. The device comprises a shell, amounting frame, a lead screw, a lead screw sliding table, a connecting plate, a micro motor, a demagnetizing coil, a bracket, a side door, a handle, a guide rail, rollers, a fixed frame, a pull plate,a rectangular plate, a transmission rod, a stepping motor, a movable frame, a spring, a limiting column, a through hole, an L-shaped plate, a cam, a fixed frame, a cam motor, an electric push rod anda push plate. According to the invention, the storage device needing demagnetization is placed between the two L-shaped plates and the rectangular plate; the cam motor is started through the externalswitch; the cam motor drives cam to rotate, and the cam rotates to drive the movable frame and the L-shaped plates at the two ends of the movable frame to slide in the two through holes in one end ofthe fixed frame, so that the two ends of the L-shaped plates fix the storage equipment between the rectangular plate, the L-shaped plates and the fixed frame, the storage equipment of different sizescan be fixed conveniently, the demagnetization of the storage equipment is facilitated, and the demagnetization efficiency is improved.

The invention discloses a high-temperature-resistant electric control hoisting electro permanent magnet which comprises chains connected with hoisting equipment, lifting lugs arranged at the bottom ends of the chains, and an electro permanent magnet body fixedly connected to the bottom ends of the lifting lugs, wherein the electro permanent magnet body is of a sealed integrated structure consisting of a top plate, side plates, an end plate, an inner magnetic plate and a heat insulation plate; an iron core is arranged in the middle in the electro permanent magnet body; main excitation coils sleeve the outside of the iron core; a plurality of groups of magnetic steel are respectively arranged in the middle of the iron core; demagnetization coils respectively sleeve the outside of the multiple groups of magnetic steel; an outer magnetic pole is arranged at the bottom end outside the electro permanent magnet body; the top plate, the side plates, the outer magnetic pole, the inner magnetic plate, the iron core and the multiple groups of magnetic steel form a magnetic loop. According to the high-temperature-resistant electric control hoisting electro permanent magnet, current meeting different demands is generated by using electric control energy; during excitation, the high direct current is supplied; during demagnetization, the intermediate-frequency alternating current is supplied to the demagnetization coils; and therefore, extremely good and convenient control can be realized.

The invention discloses a magnetic manipulator adopting the magnetic frame principle. The magnetic manipulator comprises a main rack with a sealed inner cavity, a hollow cylindrical barrel made of soft magnetic materials is horizontally arranged in the main rack, and a strip-shaped permanent magnet is arranged in the hollow cylindrical barrel and rotates around the axis of the hollow cylindrical barrel. A rotating switch in rigid connection with the permanent magnet and a steering engine output shaft is arranged at one end of the hollow cylindrical barrel. A brass bar equally dividing the main rack into a left part and a right part is further vertically arranged in the main rack, and the inner cavity of the main rack is filled with soft magnetic materials. According to the magnetic manipulator, the permanent magnet is rotated to control existence and absence of magnetism, and therefore a target object is grabbed or released; by means of the characteristics of easy magnetization and quick demagnetization of the soft magnetic materials, the functions of grabbing and releasing the target object are achieved, and the magnetic manipulator is easy and convenient to manufacture and high in feasibility.

The invention provides a dual-purpose magnetism-removal smashing device for a solid-liquid electrode material. The dual-purpose magnetism-removal smashing device comprises a box body, wherein the box body comprises a solid magnetism-removal cavity, an intermediate partition board and a liquid magnetism-removal cavity; the solid magnetism-removal cavity is internally provided with a graphite feed hopper, a smashing device, magnetism removing devices and a box door; the smashing device comprises a drive motor and a rotating shaft; a first magnetism removing device comprises a first magnetism removing plate, a second magnetism removing plate, a third magnetism removing plate, a fourth magnetism removing plate and a fifth magnetism removing plate; the box door is arranged at the left lower end of the solid magnetism-removal cavity, and a handle is arranged on the box door; the intermediate partition board is arranged between the solid magnetism-removal cavity and the liquid magnetism-removal activity; the liquid magnetism-removal activity is internally provided with an inclined base plate, a discharge tube, a second magnetism removing device, a flow guide plate and a liquid feed hopper; the second magnetism removing device comprises a cylinder and a flow guide rod; a magnet rod is arranged in the cylinder in a sleeving manner; and the liquid feed hopper is arranged at the upper end of the liquid magnetism-removal cavity. According to the device, the magnetism is removed in a circulating manner, and the magnetism removal is thorough; and solid magnetism removal and liquid magnetism removal can be carried out simultaneously, so that the efficiency is high.

The invention relates to a photoelectric liquid sensor. The photoelectric liquid sensor is characterized by comprising a transmitting optical fiber and a receiving optical fiber which are bilaterally oppositely arranged at an interval, the outer end of the transmitting optical fiber and the outer end of the receiving optical fiber are led out of a fluid, a light-emitting diode used for lighting the transmitting optical fiber is arranged at the position, adjacent to the transmitting optical fiber, out of the fluid, the receiving optical fiber is capable of receiving the light transmitted by the transmitting optical fiber and transmitting the light to a photoelectric conversion module, a shielding piece capable of moving under the action of the fluid is arranged between the transmitting optical fiber and the receiving optical fiber, and whether the receiving optical fiber can receive the light transmitted from the transmitting optical fiber or not is determined by vertical motion of the shielding piece. The diameter of the transmitted light is quite small due to the features of the light transmitted by the fiber, the light can be sensed if only the shielding piece slightly moves by a distance, and sensitivity is quite high. Compared with a traditional magnetic water flow sensor, the photoelectric liquid sensor has the advantages of freeness from affection of external magnetic field, operation is stable, the fiber is less prone to damage, and the part easy to be damaged is the light-emitting diode which is quite convenient to maintain. The invention further relates to a water pump provided with the above sensor.

A power converter designed for operation at high frequencies includes a soft-switching cell comprising a split inductor, a resonant inductor, a resonant capacitor, two diodes and a controlled semiconductor. Alternatively, the power converter includes a soft-switching cell comprising a transformer having isolated windings, a resonant inductor, a resonant capacitor, two diodes and a controlled semiconductor.

Eddy current generated around a magnetic circuit in an MRI apparatus is one of the causes of deviation from an ideal magnetic field gradient waveform and causes image distortion, loss of strength, ghost generation, loss of signal, and spectral distortion. An object of the present invention is to suppress the generation of the eddy current. In an MRI apparatus, a ferromagnetic material formed from powder is used in a part of a magnetic circuit: the powder mainly comprising a mother phase containing iron or cobalt and showing ferromagnetism; and a high-resistance layer having a resistance not less than ten times as high as the mother phase and a Vickers hardness lower than that of the mother phase being formed in layers along parts of the surface of the powder on parts or the entire of the surface.

The invention discloses a solid-liquid dual-purpose chemical raw material demagnetization crushing device, and belongs to the field of chemical production equipment. The device comprises a box, a solid demagnetization chamber and a liquid demagnetization chamber; a sealing separation plate is vertically arranged in the center in the box, and is fixedly connected with the inner wall of the box; a first demagnetization plate is low in left end and high in right end; an unloading port is formed in the left end of the first demagnetization plate; the liquid demagnetization chamber is arranged in the box on the right side of the sealing separation plate; a liquid inlet hopper, a guide plate, a magnet rod, a cylinder, a guide rod, an inclined baseplate and a liquid discharge pipe are arranged inthe liquid demagnetization chamber; the liquid inlet hopper is arranged in the center of the top end of the liquid demagnetization chamber, and is fixedly connected with the box; the magnet rod is sleeved with the cylinder; and the inclined baseplate is arranged at the bottom end of the liquid demagnetization chamber, and is high in left end and low in right end. The device is reasonable in structural design, circular in demagnetization and thorough in demagnetization, and can synchronously perform solid-liquid dual-purpose demagnetization to achieve high efficiency.

The invention belongs to the technical field of the decontamination device and washing machine, and particularly relates to a cleaning ball and washing machine. The cleaning ball comprises a magneticmaterial, and the cleaning ball can be attracted by a magnetic field and demagnetize when the magnetic field disappears. The cleaning ball can be relatively stably collected in the drain valve deviceused in the laundry dehydration process, so as to avoid the cleaning ball bounce back between the inner and outer barrels, and the noise that occurs frequently between the inner and outer barrel wallsduring the dehydration process can be avoided because the cleaning ball is bounced back into the inner and outer barrels; after the dehydration is completed, the cleaning ball returns to the free state, and returns to the inner and outer barrels of the washing machine with the water infusion process, and continues to clean the inner and outer barrels. The cleaning ball not only extends the service life of cleaning ball, but also improves the cleaning effect of the inner and outer barrels of the washing machine, and the noise is low, which improves the user experience.

The invention belongs to the technical field of surface protection and magnetic conductive coatings, and discloses a titanium alloy surface high-magnetic-conductivity wear-resistant coating material for magnetic fluid sealing, a preparation method of the titanium alloy surface high-magnetic-conductivity wear-resistant coating material and application of the titanium alloy surface high-magnetic-conductivity wear-resistant coating material. The titanium alloy surface high-magnetic-conductivity wear-resistant coating material sequentially comprises a wear-resistant layer, a body layer and a transition layer. The transition layer is located between a substrate and the body layer. The transition layer comprises 85%-97% of iron-cobalt-vanadium alloy, 1%-5% of Si and 1%-5% of B. The body layer comprises 85-95% of iron-cobalt-vanadium alloy, 2%-5% of Si, 2%-5% of B and 1%-5% of WC. The wear-resistant layer comprises 70%-80% of iron-cobalt-vanadium alloy, 1%-5% of Si, 1%-5% of B and 10%-20% ofWC. The coating material integrates multiple functions of the high hardness, the high wear resistance and the high magnetic conductivity. A laser cladding method is adopted to manufacture the coatingmaterial, and the coating material can serve as a titanium alloy part of a magnetic fluid sealing system to be applied to the field of aerospace.

An air conditioner or a refrigerator compressor is driven by a permanent magnet synchronous motor with a stator of a concentrated winding mode, the interval between the pole pieces of the stator (1) is La, the stator (1) and the rotor (2 ) is Lg, so that 0.3Lg<La≤2.0Lg, or, assuming that the pole shoe end thickness of the permanent stator (1) is Lb, the air gap between the stator (1) and the rotor (2) is Lg , and make 2Lg<Lb<5Lg. In addition, the outer peripheries of both circumferential end portions of the permanent magnets (6) provided on the outer peripheral portion of the rotor (2) may be formed in a concave shape that is recessed radially inward from the outer periphery of the rotor. In this way, it is difficult for the demagnetization field to act on the permanent magnet (6), thereby improving the demagnetization resistance of the permanent magnet (6).

The invention discloses a system and method for improving selectivity of artificial magnetite. The system comprises a magnetizing roaster, wherein a discharge hole of the magnetizing roaster is connected with a feeding hole of a waste heat boiler; the discharge hole of the waste heat boiler is connected with the feeding hole of a first material sealing device; the discharge hole of the first material sealing device is connected with the feeding hole of a reoxidation reaction chamber; an air inlet in the bottom of the reoxidation reaction chamber is connected with a mixer through a mixed gas pipeline; an adjusting valve, a flow meter and a pressure gauge are arranged on the mixed gas pipeline; the mixer is connected with a nitrogen pipeline and a compressed air pipeline; and adjusting valves and flow meters are arranged on the nitrogen pipeline and the compressed air pipeline. Through the system and the method, the artificial magnetite can be prevented from generating the hematite (alpha-Fe2O3) with weak magnetism through 'peroxidation', calcine containing the maghemite (gamma-Fe2O3) with strong magnetism characteristics is obtained, the selectivity of the artificial magnetite can be greatly improved, and the maghemite (gamma-Fe2O3) has important guiding significance for mineral processing industry production.

The invention relates to the technical field of cleaning devices, and particularly discloses a ground scrap iron cleaning device which comprises a base, and comprises guide plates, a soft magnet scrapattraction mechanism, driving mechanisms, a storage box and a heating mechanism which are arranged on the base. The guide plates are arranged in front of the storage box, the guide plates are symmetrically arranged on the left side and the right side of the base, the guide plates are obliquely arranged, one end of each guide plate is connected with the base, the other end of each guide plate extends towards the position above the storage box, and the driving mechanisms are arranged on the inner side walls of the guide plates and used for driving the scrap attraction mechanism to slide back and forth between the two guide plates. The heating mechanism is arranged behind the storage box and used for demagnetizing the soft magnet scrap attraction mechanism sliding to the position above the storage box. The phenomenon that a magnet is held manually, and scrap iron on the workshop ground is attracted by bending over for multiple times is avoided, and labor is greatly reduced; and the scrapiron removing effect is improved by utilizing the performance that the soft magnet is easy to magnetize and demagnetize.