65results about How to "Improve demagnetization effect" patented technology

The invention relates to an electric machine comprising a rotor (10) and a stator (20). The rotor (10) has magnet pockets for receiving permanent magnets (55, 56, 85, 86), and the magnet pockets comprise at least one first pair of magnet pockets (50, 51) and a second pair of magnet pockets (80, 11). The second pair (80, 81) is arranged further inwards than the first pair (50, 51) when viewed in a radial direction with respect to a rotational axis, and the magnet pockets of each pair of magnet pockets (50, 51, 80, 81) are arranged symmetrically to one another with respect to an axis of symmetry (45), wherein the axis of symmetry (45) runs in the radial direction and through the center of the rotor (10). The magnet pockets of each pair of magnet pockets (50, 51, 80, 81) are arranged such that the distance of each magnet pocket to the axis of symmetry (45) increases as the distance to the circumferential edge (110) of the rotor (10) decreases. The magnet pockets of the first pair (50, 51) are arranged at a first mechanical angle to one another, and the magnet pockets of the second pair (80, 81) are arranged at a second mechanical angle to one another. The invention is characterized in that the first angle ranges from ca. 100° to ca. 140°, in particular from ca. 120° to ca. 140°, and the second angle ranges from ca. 65° to ca. 112°, in particular from ca. 88° to ca. 112°.

The grinder chuck magnetizing and demagnetizing controller has one main loop and one monolithic computer control loop. The main loop includes one H-bridge inverter circuit and two relays connected to the opposite angle of the H-bridge inverter circuit. During magnetizing, DC voltage is output through the relays, and during demagnetizing, the output is switched to the H-bridge inverter circuit and connected to the electromagnetic chuck. The control loop with monolithic computer controls the switching of the output voltage and the control of the output voltage amplitude. The present invention has rectifying bridge plus relay has high voltage fluctuation resistance, high antijamming capability, excellent demagnetizing effect, greatly lowered magnetizing power consumption and other advantages.

The invention discloses a transformer iron core demagnetization method and especially provides a method for demagnetizing the iron core of a transformer after the DC resistance test. According to the invention, the voltage is applied onto the primary winding of a transformer by a DC power supply for three times, wherein the voltage-applying amplitude is the same each time and the polarity thereof is alternately changed. The voltage-applying duration is determined based on the acquired current waveform of the primary side of the transformer. During the first two times, the current applied onto the primary winding of the transformer reaches a forward peak value and a reverse peak value respectively. During the third time, the current applied onto the primary winding of the transformer occupies only half of the duration from the forward peak value to 63.2% of the reverse peak value. Through the above three voltage application processes, the iron core of the transformer is demagnetized. Based on the above method, the demagnetization duration is greatly shortened and the demagnetization effect is ensured at the same time. Meanwhile, the demagnetization equipment is small in power and good in practicality.

The invention relates to a demagnetization method of a multilayer shielding device; the demagnetization method realizes demagnetization based on a demagnetization coil system, and the demagnetizationcoil system comprises a multi-turn demagnetization coil, a plurality of connecting wires and a power supply module; the multi-layer shielding device comprises at least two layers of shielding bodies,the shielding bodies are sleeved layer by layer from inside to outside, multiple turns of demagnetization coils are wound on each layer of shielding body at intervals, one half of each turn of demagnetization coil is located on the inner side of the wound shielding body, and the other half of each turn of demagnetization coil is located on the outer side of the wound shielding body; each demagnetization coil is connected to the power supply module through a corresponding connecting wire; the power supply module comprises a controller, and the controller is connected with each connecting wire.The demagnetization method comprises the steps: introducing corresponding demagnetization currents into all the demagnetization coils, demagnetizing all the layers of shielding bodies layer by layer from inside to outside and then performing demagnetization layer by layer from outside to inside, wherein the intensity of the demagnetization currents is set according to the sizes of all the layers of shielding bodies. Compared with an existing demagnetization method, the method can effectively improve the demagnetization effect.

The invention provides a rotary classifying screen with a de-magnetism function. The rotary classifying screen comprises a machine frame, a classifying device and de-magnetism devices. The classifying device comprises a power mechanism and a classifying mechanism. The power mechanism drives the classifying mechanism to operate. The classifying mechanism comprises a screen barrel and a screen body. A feeding hopper is arranged on the top of the screen barrel. An elastic supporting plate is arranged at the bottom of the screen barrel. The screen body is arranged inside the screen barrel. The screen body comprises a first screen face and a second screen face. The pore diameter of the first screen face is larger than that of the second screen face. A first discharging outlet, a second discharging outlet and a third discharging outlet are arranged in the lower sides, corresponding to the three regions partitioned by the two screen faces and the screen barrel, of the screen barrel. Each discharging outlet is correspondingly provided with a valve. The three regions partitioned by the two screen faces and the screen barrel are each provided with one de-magnetism device. Each de-magnetism device comprises a drawer-type frame and a plurality of magnetic rods. The screening process is stable, the classifying efficiency is high, the service life is long, de-magnetism is performed while screening is performed, the technological steps are simplified, the working efficiency is high, and economic benefits are good.

The invention relates to the field of bearing machining, in particular to a bearing ring demagnetizing device. A sensor in the bearing ring demagnetizing device is used for detecting an external bearing ring signal and transmitting the signal to a CPU. A data input and display unit inputs demagnetizing curve parameters to the CPU and displays demagnetizing parameter information. First and second drive circuits receive the demagnetizing curve parameters of the CPU and control current changes of first and second layer coils respectively, so that changes of a demagnetizing magnetic field are controlled for demagnetizing. The included angle between the winding direction of the second layer coil and the winding direction of the first layer coil ranges from 20 degrees to 45 degrees. The number of turns of the second layer coil is 30-40% that of the first layer coil. The first layer coil participates in the whole demagnetizing process, the second layer coil participates in demagnetizing only at the last stage of demagnetizing, namely during the period not exceeding 25% of the total time, and the second layer coil assists in eliminating the final residual magnetism intensity of bearing rings. The bearing ring demagnetizing device can well solve the problem of too much residual magnetism caused by incomplete demagnetizing of bearing ring demagnetizing equipment, is simple and small in structure, convenient to assemble and good in demagnetizing effect, and the residual magnetism of the device is smaller than 0.1 mT.

The invention provides a magnetic refrigeration device which comprises a first assembly (1) and a second assembly (2). The second assembly (2) is an annular assembly, the first assembly (1) is locatedat the radial outer side or the radial inner side of the second assembly (2), the first assembly (1) is a first magnet assembly, and the second assembly (2) is provided with an air gap space capableof containing a magnetic working medium bed (24). The first assembly (1) and the second assembly (2) can do relative rotation motion, and the magnetic force line direction of the first magnet assemblyis distributed in the circumferential direction of the annular second assembly (2). According to the magnetic refrigeration device, the radial size of the second assembly can be made larger, the containing air gap volume of the magnetic working medium bed is increased, the quantity of magnetic working media or the actual effective working space of magnets is increased, the refrigeration or heating effect of the magnetic refrigeration device is improved, and the refrigeration or heating performance of the magnetic refrigeration device is improved.

The invention relates to a magnetic gap channel pass-type demagnetizer, comprising a belt conveyer, a magnetic gap channel frame, and a demagnetization assembly. The demagnetization assembly comprises two E-shaped iron cores and coil windings matched with the iron cores. The E-shaped iron core is provided with three iron core columns, and the iron core column on the middle is shorter than the iron core columns on two ends. A coil winding is sleeved on the iron core column on the middle. The coil windings are connected with a demagnetization circuit. After openings of the two E-shaped iron cores are joined oppositely, a magnetic gap channel is formed. The magnetic gap channel frame passes through the magnetic gap channel. The conveyer belt on the upper end of the belt conveyer is arranged passing through the magnetic gap channel frame. Two guiding wheels of the belt conveyer are respectively arranged on two ends of the magnetic gap channel frame. The conveyer belt on the upper end of the belt conveyer is supported by the magnetic gap channel frame. The magnetic gap channel pass-type demagnetizer can improve magnetic field intensity of a magnetic field, and effectively improve demagnetization quality of workpiece, and reduce energy consumption, and improve processing precision of products.

The invention discloses a method for performing frequency boosting and demagnetization to the relative static object. The key technology of the method lies in that a electromagnetic conversion device with inductance property and then a relative static object are provided; the method controls the current flowing through an electromagnetic conversion and demagnetization device by changing the time for applying voltage; the magnitude of the applied voltage is invariable during the process of a complete demagnetization, and the voltage polarities are alternately changed; the time for each applied polarity voltage is gradually reduced from long to short, and the frequency is gradually increased from low to high; as the frequency increases, the current of the electromagnetic conversion and demagnetization device is correspondingly reduced, thereby the electromagnetic conversion and demagnetization device generates the alternating magnetic field from strong to weak; under the action of the magnetic field, the electromagnetic conversion and demagnetization device as well as the static object to be demagnetized is demagnetized, and the method has the advantages of simple control, high efficiency and good and stable demagnetization effect: the identical demagnetization effect can be realized in a shorter time.

The invention provides a rotary demagnetizer and a lithium battery negative electrode material powder processing device. The rotary demagnetizer comprises an annular feeding disc and a discharging disc. The feeding disc corresponds to the discharging disc. Three to eight cylindrical stainless steel sleeves are arranged between the feeding disc and the discharging disc. An opening is formed in one end of each stainless steel sleeve, and movable magnetic bars are arranged in the stainless steel sleeves. The feeding disc or the discharging disc is connected with a motor providing rotation power. Magnetic matter in negative electrode material powder can be effectively removed, the quality of negative electrode materials is greatly improved, and the rotary demagnetizer has high application and popularization value.

The invention discloses a double-track frame demagnetizer, which comprises a rack, a frame demagnetizing coil, a conveyor belt, a first motor and a power supply device, wherein the first motor drives the conveyor belt to move; the power supply device supplies electricity to the frame demagnetizing coil to control the frame demagnetizing coil to work; the first motor is fixed on the rack; a support member capable of carrying out linear movement along the rack and a second motor for driving the support member to move are arranged on the rack; the frame demagnetizing coil is fixed on the support member; and the conveyer belt passes through the frame demagnetizing coil and can move in the direction parallel to the movement direction of the support member. According to the double-track frame demagnetizer, the conveyor belt can displace and the demagnetizing coil can also move; and when the double-track frame demagnetizer is used, a bearing part with a fixed position can be demagnetized only by controlling the demagnetizing coil to move. The position can be kept invariable when the bearing part is demagnetized, so that the control is relatively convenient when station transferring on the bearing part is carried out through a mechanical arm; the overall configuration is relatively simple; and when the double-track frame demagnetizer works, the effect of strengthening demagnetizing can also be put into a play through coordinating movement of the conveyer belt and the demagnetizing coil.

The invention provides an improved grinder sucker magnetizing and demagnetizing controller, which consists of a main circuit and a control circuit. The main circuit includes an H-bridge inverting circuit, and the control circuit includes positive and negative switch control and amplitude control of output voltage. The upper tube at one side of the H-bridge inverting circuit is connected with a relay at the two ends respectively, which is in parallel connection with a power tube and in connection with a filtering circuit. In magnetizing, the invention transmits adjustable DC voltage through relay and power tube, and in demagnetizing, the invention transmits adjustable voltage after alternative connection, and is connected with electromagnetic sucker directly; the control circuit consists of a SCM, a photoelectric coupler, and a timer, which are connected with each other. The control circuit makes positive and negative switch on output voltage and transmits the voltage amplitude. By making magnetizing voltage adjustable, the invention enhances the magnetizing precision, lowers magnetizing power consumption, and reinforces the performances of anti-disturbance and liability. The H-bridge transmits adjustable and excellent demagnetizing effect; after tests, all performance indexes are proved to be superior to those of prior arts. Furthermore, the invention has the advantages of high reliability, good anti-disturbance, simple structure, and convenient installation.

Disclosed demagnezing pole subassembly of spatial rotating alternating magnetic field includes one or two groups, and one demagnezing pole group includes multiple demagnezing poles. Being connected to AC power source in certain phase, pole winding is installed onto magnetic iron core constitutes a magnetic pole. Demagnezing poles are distributed in array, and each demagnezing pole is connected to AC power source in different phases. There are certain spatial distances between magnetic poles in demagnezing device so as to form spatial rotating alternating magnetic field. Thus, there are demagnetizing fields in space in any direction so that direction of residual magnetism in work piece does not need to be determined in advance. The invention raises demagnezing efficiency, applicable to fields such as milling process, detection of defects, precision work, instrument and meters.

The invention provides automatic powder demagnetization equipment. According to the automatic powder demagnetization equipment, a spiral buffer mechanism is arranged, and therefore the material falling speed is reduced, the particle collision time is prolonged, meanwhile, in the process that particles are changed from movable to static, a tangential-velocity component is achieved, completely inelastic collision is avoided, shearing crushing of powder particles is effectively prevented, tiny particles such as dust attached to the surfaces of the powder particles can be separated, materials areprevented from falling on a screen net and prevented from being accumulated, and the screening effect is good; a screening mechanism is arranged, and therefore accumulation of a large amount of powderon the screen net can be avoided, the grading efficiency is high, overall machine vibration is avoided, and the service life is prolonged; a demagnetization mechanism is arranged, and therefore the demagnetization effect is good, demagnetization is carried out while screening is carried out, screening is carried out while demagnetization is carried out, the number of process steps is smaller, theworking efficiency is high, and economic returns are good; and the structure is simple, and operation is easy and convenient.

The invention relates to a brushless magnetic separation device and method. The device comprises a rack, a feeding hopper, a magnetic separation device, a driving motor and a material separation bin.The magnetic separation device is arranged above the material separation bin and comprises an iron separation device and an iron discharging device, the feeding hopper is located at a feeding side ofthe iron separation device, and the iron discharging device is located at an discharging side of the iron separation device. The iron separation device and the iron discharging device are driven by adriving motor to operate and rotate oppositely. A material enters the material separation bin from the feeding hopper, wherein non-ferrous materials are directly discharged from a discharging openingof the material separation bin, and ferrous materials are adsorbed by the iron separation device, conveyed to the iron discharging device and conveyed to an iron discharging opening of the material separation bin through the iron discharging device for discharging. The magnetic discharge effect is good, and incomplete magnetic discharge caused by insufficient sweeping force is avoided. The magnetic separation part is of a double-roller structure, and has clear magnetic selection and magnetic discharge functions and materials are discharged from different channels. A single motor is used for driving in the magnetic separation process, and the energy-saving effect is good. A magnetic control device is adopted, and magnetic materials can be automatically sorted.

The invention discloses a preparation method of an iron-based powder metallurgy friction wheel. The preparation method comprises the steps that a blank A1 and a blank A2 are made from iron powder softmagnetic material, the blank A1 and the blank A2 are sintered in a continuous sintering furnace under the protective atmosphere of ammonia decomposition and liquid nitrogen mixed gas, a blank A3 is made from FWCuSn6Zn6Pb3-Tin bronze powder, A1, A2 and A3 are connected together to form a composite part C, the composite part C is put into a hydrogen sintering furnace for sintering and is dischargedafter cooling, a semicircular inner hole of the sintered part C is subjected to fine shaping treatment, and a rubber ring is bonded into an annular groove of the part C to obtain a finished product.Due to different atmosphere protection and secondary sintering, the sintering of a tin bronze ring and soft magnetic matrix material of the friction wheel is closely combined, the phenomenon of copperring falling off in the use of the friction wheel of a machined inlaid copper ring is eliminated, and the characteristics that the preparation method is simple, the material is saved and the production efficiency is high are achieved.