41results about How to "Improve starting ability" patented technology

The invention relates to a single-phase brushless motor and an electric tool. The motor comprises a stator and a rotor, wherein the rotor can rotate relative to the stator, the stator comprises a stator magnetic core and a winding, the stator magnetic core comprises a yoke part and at least two teeth, the at least two teeth inwards extend from the yoke part, each tooth comprises a tooth body and a tooth crown, the tooth crown is arranged at a tail end of the tooth body and comprises a first pole shoe and a second pole shoe, the first pole shoe and the second pole shoe respectively extend towards two sides, the rotor is accommodated in a space encircled by the first pole shoes and the second pole shoes of the at least two teeth, a positioning groove is formed between the first pole shoe and the second pole shoe of each tooth and faces the rotor, the positioning groove is biased towards the first pole shoe, so that a pole surface of the second pole shoe facing the rotor is larger than a pole surface of the first pole shoe facing the rotor. The single-phase motor is relatively large in starting torque and high in starting capability, the starting capability of the single-phase motor facing a direction is higher than the starting capability of the single-phase motor facing another direction, and the single-phase motor is particularly applicable for application occasions such as the electric tool.

The invention relates to a maize flooding stress response zmERF12 gene promoter and is characterized by disclosing a DNA sequence of the zmERF12 gene promoter. The promoter is characterized by comprising cis-elements, namely two G-boxes, five ABREs, a CCAAT-box, four CGTCA-motifs, a GARE-motif, a GC-motif, a TCA-element, a TGA-element and an as1, wherein the cis-elements are related to plant hormones and anaerobic stress responses. The promoter is a tissue-specific promoter only expressed in the root system and an inductive promoter efficiently expressed under flooding induction. The insect-resistant, disease-resistant and adversity-resistant capabilities of the roots of transgenic plants can be improved by the promoter under flooding and waterlogging conditions. Meanwhile, the promoter is only expressed in the roots so that food safety problems cannot occur when the overground parts of the transgenic plants are eaten. The promoter has an excellent application prospect in the waterlogging-resistant genetic improvement of xerophilous plants.

The invention provides a maize zmERF18 gene promoter. The maize zmERF18 gene promoter is characterized by comprising nucleotide sequences shown as SEQ ID No.1 or certain nucleotide sequences. The certain nucleotide sequences have functions equivalent to functions of the nucleotide sequences shown as the SEQ ID No.1 and are derived from the nucleotide sequences shown as the SEQ ID No.1 by means of replacing, omitting or adding a nucleotide or a plurality of nucleotides. The maize zmERF18 gene promoter has the advantages that transgenic plants with exogenous genes can be directly driven by the promoter, the promoter is high in promotion ability, the exogenous genes can be quickly and effectively promoted to be strongly expressed at the roots of the plants under flooding conditions, and the waterlogging tolerance or the insect resistance, the disease resistance and the like of the plants can be improved; the promoter is a tissue specific promoter which is only specifically expressed at roots, and accordingly the transgenic food safety problem of the transgenic plants with edible non-root portions can be solved; novel root specific expression and flooding inducible promoter resources can be provided for modifying waterlogging tolerance inheritance of maize and other arid crop, molecular mechanisms for forming the waterlogging tolerance of the maize can be further illustrated, and accordingly the maize zmERF18 gene promoter has important theoretical value and an important practical significance.

The invention relates to an integrated type commercial electronic control diesel engine starting, stopping and auxiliary braking system and method. The system comprises an integrated starter electricity generator device, a back power take-off flywheel housing, an air discharge type engine brake device, an ECU and an air discharge butterfly valve; the integrated starter electricity generator device is installed on the back power take-off flywheel housing and is meshed with a flywheel through a gear, the air discharge type engine brake device is installed in a rocker arm chamber, the air discharge butterfly valve is installed in an overall vehicle air exhaust pipe, the ECU is installed on an engine and is further connected with a vehicle speed sensor, an engine rotating speed sensor, a clutch state sensor, a speed changing box gear sensor, an accelerator position sensor and a temperature sensor. According to the integrated type commercial electronic control diesel engine starting, stopping and auxiliary braking system and method, the integrated starter electricity generator device is adopted, the engine manufacturing cost is reduced, and the starting capacity is high; the engine auxiliary braking function can be further achieved, the travelling safety is improved, the overall vehicle brake shoe abrasion is reduced, and the overall vehicle using cost of a user is reduced.

The invention discloses a double-cage rotor punch, a double-cage rotor and a motor, wherein the double-cage rotor punch has a circular structure, and the double-cage rotor punch of the circular structure is provided with A plurality of rotor slots, the plurality of rotor slots are a combination of any two or three slot structures among double-cage convex slots, double-cage trapezoidal slots and double-cage knife-shaped slots. The invention reduces the starting current and slot leakage reactance of the motor, improves the skin effect and rotating speed of the motor, and enhances the starting ability and operation stability of the motor.

The invention discloses a 9 / 8-pole switched reluctance motor. The motor has a stator tooth quantity of 9, a rotor tooth quantity of 8 and a phase quantity of 3; stator teeth comprise 3 wide teeth and6 narrow teeth; 1 coil is wound on each stator teeth; the motor is of a 120-degree phase structure with a winding; each phase comprises 3 stator teeth which are adjacently distributed, wherein the wide teeth is located between the two narrow teeth; coils on the 3 adjacent stator teeth are connected to a one-phase winding; a distance angle of each phase of the wide tooth and the two narrow teeth is45 degrees and the three phases are uniformly distributed in space; a difference between the phases is 120 degrees; each phase of magnetic path is distributed as a short magnetic path, the loss of aniron core is small and the coupling between the phases is weak. Compared with a traditional three-phase 12 / 8-pole switched reluctance motor, the motor has the advantages that an effective output range of a torque of the motor is large, the starting capability is relatively strong and the pulse of the torque is small; each phase of magnetic flux is of a short magnetic path structure and the loss of the iron core of the motor is easy to reduce; the coupling between the phases is weak and the reliability of the motor is easy to improve.

The invention discloses a high-power medium-speed generator. The generator comprises a motor body, and the motor body comprises a rotating shaft, a front bearing, a front end cover, a fan, a base, a stator winding, a stator core, a rotor core with a winding, a box body combination group, an exciter stator, an exciter rotor, a rear end cover and a rear bearing; and the base is of a square structure formed by welding an upper cover plate, ribs, side cover plates, a front end plate, an air deflector, a supporting plate, a rear end plate, a lower cover plate, an inclined cover plate and a bottom foot plate, the front end cover is formed by connecting a front end cover blank, a front bearing sleeve and an insulating pad through bolts and then machining, and the front end cover has an insulating function and can effectively prevent shaft current. The power of the generator body is 1300-1800 kW, the number of poles is eight, the rotating speed is 750 r / min, the power of the generator is large, the rotating speed is low, the load capacity is high, the size is small, the weight is light, and the power-to-weight ratio is high.

The invention discloses a nickel-metal hydride battery pack for a pure electric bus, and belongs to the technical field of an electrocar power supply. The nickel-metal hydride battery pack comprises single batteries, partition plates and battery connection plates, and also comprises unit connection plates, wherein the single batteries are connected in parallel to form battery units through the battery connection plates; the battery units are connected in series to form battery modules through the unit connection plates; the battery modules are connected in series to form a battery box through the unit connection plates. The nickel-metal hydride battery pack for the pure electric bus is simple in structure and easy to assemble, the heat radiating area is increased by parallel connection, a small amount of heat is generated by in -parallel shunting, the nickel-metal hydride battery pack is high in volumetric specific energy and gravimetric specific energy, quick to accelerate the bus, strong in startability, good in thermal diffusivity of the battery pack, safe and reliable, and the power requirements of the pure electric bus can be met.

The invention discloses a positive electrode plate for a large-capacity battery. The positive electrode plate includes a positive electrode grid and a positive electrode paste coated on the positive electrode grid. 0.05‑0.07wt%; aluminum 0.01‑0.02wt%; antimony 0.3‑0.5wt%; iridium 0.03‑0.05wt%; rhenium 0.07‑0.15wt%; For: magnesium lead acid 0.1‑0.3wt%; stannous sulfate 0.1‑0.3wt%; polyolefin 0.1‑0.3wt%; 4BS seed crystal 0.1‑0.3wt%; sodium perborate 0.01‑0.03wt%; Ketjen black 0.03 ‑0.05wt%; dilute sulfuric acid 9‑10wt%; pure water 10‑12wt%; fiber 0.1‑0.12wt%, the balance being lead powder with an oxidation degree of 71‑73%; the invention also discloses a large-capacity battery , including a negative plate and a separator, the separator is a double-composite type, from left to right is a thick glass fiber layer, a fine glass fiber layer, a PE layer, a fine glass fiber layer and a thick glass fiber layer, and the PE layer is wrapped with At least one positive plate adopting the above formula has the characteristics of excellent deep discharge performance, fast recovery ability after deep discharge, and strong starting ability.

The invention discloses a vertical-axis wind turbine blade and a structure thereof. The vertical-axis wind turbine blade comprises ceramic aluminum alloy supports rotationally connected with the upperend of a wind shaft. Each ceramic aluminum alloy support comprises multiple supporting frames and a first side support, each first side support is connected with four transverse supports, and the multiple transverse supports of each first side support are connected with a second side support together. The transverse supports are evenly distributed on the first side supports and the second side supports, the transverse supports are connected with impeller components through screws, each impeller component comprises a ceramic aluminum alloy arc-shaped wind deflector, each ceramic aluminum alloyarc-shaped wind deflector is connected with four connecting plates, the connecting plates are provided with rectangular avoiding openings, and the positions and sizes of the rectangular avoiding openings are matched with those of the second side supports. The four connecting plates of each impeller component are connected with the corresponding transverse supports through screws, the connecting plates are connected with lug plates, the lug plates and the transverse supports are provided with through holes, and the two through holes of each lug plate and the corresponding transverse support are matched with locking screws and are connected with reinforcing strips through the locking screws.

The embodiment of the invention discloses a brushless direct current motor, a method for positioning the position of a rotor of the brushless direct current motor and a method for starting the brushless direct current motor. The technical scheme that a preset pulse voltage vector is exerted on a motor winding, the extreme value of the oscillating current amplitude produced in the voltage increasing step is detected and a 60-degree sector where the rotor is located is determined according to the corresponding relation between the extreme value of the oscillating current amplitude and the rotor position is adopted, and the technical effects of being high in starting reliability, high in starting capacity when the load is large and low in noise are achieved.

The invention relates to the fields of yeast biotechnology and synthetic biology, in particular to a Phaffia rhodozyma RNA polymerase III promoter and application thereof. The promoter is the Phaffia rhodozyma RNA polymerase III promoter; the promoter is SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, or 70% of the above sequences Homologous DNA nucleotide sequence with promoter activity. The promoter disclosed in the present invention is applied to the Phaffia rhodozyma CIRSPR-Cas9 system to guide the expression of gRNA in the system, and the gene editing efficiency is increased by 4 times.

The embodiment of the invention discloses a brushless direct current motor and a method for positioning the position of a rotor of the brushless direct current motor. The method comprises the voltage increasing step, namely, when a motor is in a static state, a series of impulse voltage vectors with the preset time length are exerted on a motor winding; the detecting step, namely, a direct current bus current peak value produced through the voltage increasing step is detected; the positioning step, namely, the 60-degree sector where the rotor is located is determined according to the corresponding relation of the current peak value and the rotor position. The technical scheme that when the motor is static, a series of testing voltage pulse strings with the preset time length are exerted on the motor winding, the winding responds to the current to analyze and judge the winding inductance peak value, and the 60-degree sector where the rotor is located is judged according to the winding inductance and the rotating angle of the rotor is adopted, and therefore the technical effects that when the load is low, the reverse vibration does not exist, and when the load is large, the starting capacity is high are achieved.

The invention discloses a motor rotor and a self-starting synchronous motor, belongs to the field of the motors and the accessories, and is designed for solving the problem that the existing structure is bad in starting capacity. The motor rotor comprises an iron core, a mouse cage and a permanent magnet, the permanent magnet is a platy structure, and at least partial region on the permanent magnet is bent towards a vertical direction of a plane to which the permanent magnet belongs. The self-starting synchronous motor comprises a stator, and the motor is provided with the above rotor. The motor rotor disclosed by the invention is capable of reducing harmonic wave when the motor is started, reducing the brake torque while starting, and improving the starting capacity of the motor. The self-starting synchronous motor disclosed by the invention solves the technical difficulty that the self-starting synchronous motor cannot be widely applied, the starting capacity is excellent, and the advantage of the motor can be efficiently exerted.

The invention relates to a baffle plate felt of a lead storage battery, characterized in that it is made by continuous glass fiber and adhesive through large roller process, where the continuous glass fiber content is 85-90 (mass)% and the adhesive content is 10-15 (mass)%. The steps are as follows: (1) making basic glass balls in a glass fiber state through a fusing-wiredrawing device, and at the same of forming fiber by wiredrawing, uniformly spraying polyacrylate solution on the glass fiber; and after forming a condensed felt, slicing off the condensed felt along the axis of the roller and spreading it on a platform; (2) transversely drawing the condensed felt on the platform in the cutting direction; (3) at the same time of drawing, drying the drawn felt between 180 deg.C and 200 deg.C; (4) after all the felt is dried, rolling the felt and cutting it into parts. The baffle felt can make the baffle posses the characters of flat surface, strong absorbing ability, good acid resistance, uniform thickness, fewer potassium permanganate reducing matter, etc.

The invention discloses an induction type rotor and a switched reluctance motor, and belongs to the field of switched reluctance motors. The induction type rotor comprises a rotor core and a conducting ring, salient poles are arranged on the rotor core, pole bodies are arranged on the salient poles, and the conducting ring is arranged on the rotor by surrounding the pole bodies of the salient poles. The switched reluctance motor comprises a rotor and a stator, wherein the induction type rotor is adopted as the rotor. The conducting ring is arranged on the salient poles of the rotor core, induced current is generated by the conducting ring in the working process to form induced magnetic poles, and magnetic circuits are concentrated to the salient poles of the rotor, so that the magnetic energy utilization rate and the output torque are increased.

The present invention discloses a switched reluctance motor with position detection coil(s). A motor stator consists of an armature stator and a detection stator, and the armature stator and the detection stator are isolated with each other. The armature stator and the detection stator consist of 4 C-shaped structures, and each C-shaped structure is provided with 2 teeth. Each tooth of each C-shaped structure of the armature stator is winded with an armature coil, and each tooth of each C-shaped structure of the detection stator is winded with a detection coil. An armature magnetic circuit anda detection magnetic circuit are short magnetic circuit structures, the armature magnetic circuit and the detection magnetic circuit are decoupled from each other, the inductance of a detection winding is not affected by the current of the armature winding, that is, not affected by the motor saturation degree, and the detection precision of the rotor position is high. The armature magnetic circuit and the detection magnetic circuit are short magnetic circuits. The motor has the advantages of low core loss and high efficiency. According to the motor, only the arranging mode of axial series connection is needed, three single-phase motor rotors are dislocated to a certain angle with each other, and thus the three-phase switched reluctance motor with strong starting capability, low core lossand self-contained position detection function can be manufactured.