640results about How to "Small starting current" patented technology

The invention relates to a metal/ceramic nano complex self-repairing additive, which comprises metal nano micropowder and nano natural ore powder as main material, detergent, catalyst, antioxidant, and solvent, and can be used in lube, grease and ultrasonic medium. The advantages of this invention include: it can form rapidly high-hardness self-repairing protection layer on a plurality of metal friction surfaces with thickness adjustable to optimize gap and improve surface physical and chemical property, and has wide application in friction dual parts.

The invention relates to a voltage space vector control device and a voltage space vector control method for soft start. At present, a soft start technology has the problems of high starting current and low starting torque, and frequency converter soft start has the shortcoming of difficulty in the implementation of power frequency switching. A three-phase alternating current power supply is used for supplying power, six electric GTOs (gate-turn-off thyristors) can be reversely connected in parallel, an IGBT (insulated gate bipolar transistor) is adopted for a continuous current circuit, a voltage space vector control circuit is formed under the control of a microcontroller, and a current transformer is used for transmitting a three-phase current signal to the microcontroller for current limiting start and current monitoring. The phases A, B and C of the power supply of a three-phase alternating current asynchronous motor are subjected to alternating current voltage regulation and frequency modulation control under the control of the microcontroller, a voltage space vector control strategy is used for realizing hexagonal flux linkage track control over the alternating current motor, the voltage/frequency ratio is relatively stable, and the stability of main magnetic flux of the motor is ensured.

The invention belongs to electric motor, especially relates to triphase capacitance double rotor cage electric motor with high starting torque and low running power, which is made up of a stator, a rotor and a shaft. The stator slot of the electric motor is embedded with tow sets of low harmony concentric triphase symmetric phase change double-layer windings, the compensation windings 3-1 is connected with a capacitance C in series, the electric motor double rotor cage arranges two types, one is casting aluminum alloy double rotor cage rotor, the second one is casting aluminum double rotor cage rotor, the double rotor cage rotor is low drain reactance, the work winding and the compensation winding of the stator are connected in parallel onto the triphase power, when starting, the motor outputs high starting torque and inputs low starting current, high starting factor; when the electric motor runs normally, it can output the low power, high efficiency, high power factor, high overloading ability, which is a small 'horse' but driving large car, it saves the energy, belongs to the high efficiency energy-saving electric motor.

The invention discloses a control method of an electronic expansion valve of an air conditioner. The maximum opening of the electronic expansion valve is 480 pulses. The control method comprises the steps that after a starting instruction is received, a control system of the air conditioner opens the electronic expansion valve to the maximum opening or to more than 70% of the maximum opening, and then a compressor is started; after the compressor is started and operates for a period of time till operating stably, the opening of the electronic expansion valve is adjusted to the target operating opening; an air conditioner system operates normally; when a shutting-down instruction is received, the control system of the air conditioner opens the electronic expansion valve completely. According to the technical scheme, due to the fact that the electronic expansion valve is completely opened in the starting process, the coolant pressure difference between the two ends of a system throttling device can be reduced, the starting resistance of the compressor can be reduced, and the starting current can be reduced. The service life of system elements can be prolonged. A small-capacitance capacitor can be used, and therefore the system cost can be lowered, and impact on a power grid and other household appliances can be reduced.

The invention provides a quick start-up method of synchronous motor zero-velocity sensor. The method includes that firstly, a system controller releases motor brake, starts blades to drive a fan to rotate; secondly, the system controller sends out a start-up indication to a motor side convertor after the motor speed reaches the cut-in speed; thirdly, the system controller makes the stator output end of the motor to be in short and detects stator short circuits ia, ib and ic; fourthly, the system controller computes the position angle Thetar and the rotation speed Omegar of the motor rotor according to the detected motor stator short circuits ia, ib and ic; fifthly, the system controller upgrades the relevant variable initial value in the zero-velocity sensor control strategy and starts up the zero-velocity sensor control strategy to realize the start-up of the motor according to the position angle Thetar and the rotation speed Omegar of the motor rotor in the fourth step. The invention accelerates the convergence of the zero-velocity sensor control strategy and realizes quick start-up through initializing the rotation speed and the position of the rotor in the zero-velocity sensor control strategy before the start-up of the motor.

Characters are that the under voltage lock down circuit (UVLDC) includes a voltage sampling circuit (VSC), a temperature compensation circuit (TCC), a buffer circuit, and a feedback circuit. After sampling first voltage source, VSC provides voltage-sampled signal to TCC. Shaping the output signal from TCC, buffer circuit outputs the output signal of UVLDC. TCC makes threshold value of flip-flop of UVLDC not be influenced by temperature. The buffer circuit provides a feeding point. Being connected between the feeding point and VSC, the feedback circuit is in use for realizing retardation function of circuit. Beneficial effect is that inductive band-gap reference circuit makes temperature coefficient value of threshold value of flip-flop of UVLDC be zero theoretically so as to prevent temperature drift of threshold value. Thus, the invention raises precision, stability and reliability of system.

The invention discloses a variable frequency air conditioning unit which solves the problem that in the prior art, the control over temperature and humidity precision by an air conditioner is lower. The variable frequency air conditioning unit comprises a compressor, a condenser, an expansion valve and an evaporator which are sequentially connected. The compressor is further connected with the evaporator. A condensing fan is further arranged above the condenser. An evaporating fan is further arranged above the evaporator. The compressor is a variable frequency compressor, the expansion valve is an electronic expansion valve, and a liquid storage tank is arranged between the condenser and the expansion valve. A humidifier and an electric heater are respectively arranged at an air supply outlet of the evaporating fan. A dehumidifying electromagnetic valve is further arranged between the expansion valve and the evaporator. The variable frequency air conditioning unit provided by the invention has the advantages of high precision control and energy-saving and the like, and is suitable for application.

The invention relates to an on-line energy acquisition device of an automatic transformation winding based on a current transformer (CT). The energy acquisition winding, which winds on the nanocrystal iron core, is utilized to transform magnetic field energy around the alternating current bus into electric energy, and the electric energy is processed by a low voltage drop rectifier circuit (1), a primary filter and voltage sampling circuit I (2), a delay comparison circuit (3), a relay drive control circuit (4), a zero voltage drop voltage regulator circuit (5) and a secondary voltage sampling and filter circuit II (6) to obtain a stable output voltage. The device of the invention can be used for transforming the magnetic field energy around the alternating current bus into the electric energy through the coupling of the magnetic circuit so as to provide stable electric energy for the state monitoring sensor nodes of the power grid line and the electrical equipment. The device of the invention is especially suitable to be used as a power supply for wireless sensor monitoring nodes of current, voltage, temperature and the like for high voltage pylon wires in remote districts, such as mountains, lake and the like.

The invention discloses a self-starting permanent magnet motor provided with composite material starting conducting bars, which belongs to the technical field of permanent magnet motors. A rotor of the permanent magnet motor has a stamping type structure; a permanent magnet is arranged on the inner side of a rotor core, N and S magnetic poles are arranged alternately; a permanent magnet rotor adopts a magnetic pole structure of a U type, V type or mixed type magnetic circuit; composite material rat cage starting conducting bars are uniformly distributed close to the surface of the rotor core; and the composite material rat cage starting conducting bars is made of two types of materials including brass and copper-iron alloy. The brass is positioned on a middle part between the bottom part of a rotor groove and the upper part of the rotor groove; two side parts of the upper part of the rotor groove are made of the copper-iron alloy; or the middle part of the rotor groove is made of the brass, while the two sides of the rotor groove are made of the copper-iron alloy. Two ends of each composite material starting conducting bar are shorted out outside the rotor core through a welded brass end ring. Through the adjustment of the structure sizes of the brass and the copper-iron alloy materials, the obtained permanent magnet motor has a small starting current multiple and strong demagnetization resistance, can be started smoothly, and is suitable for workplaces requiring long-time continuous operation.

The invention relates to a starting method for a current transformer, and is applied to the current transformer of which a main circuit is formed by sequentially connecting a direct current (DC)/DC conversion circuit and a DC/alternating current (AC) conversion circuit. A DC bus capacitor is arranged between the output end of the DC/DC conversion circuit and the input end of the DC/AC conversion circuit. The method comprises the following steps of: connecting an AC power grid with the DC end of the main circuit by a current limiting resistor, charging the DC bus capacitor by utilizing the AC power grid, regulating the main circuit to make the amplitude and phase of the output voltage of the main circuit are the same as those of the voltage of the AC power grid to meet grid connection requirements, and connecting the AC end of the main circuit to the AC power grid. By the starting method for the current transformer, not only relatively lower starting current is ensured to make radiation designing easier to realize, but also synchronous grid connection is realized to make grid connection impact current relatively lower; and the method is particularly applied to the starting of a DC double-channel or multi-channel current transformer.

The invention relates to a self-temperature limiting heat tracing belt with a dual-layer resin conductor and a manufacturing method thereof. The self-temperature limiting heat tracing belt is characterized by comprising a metal conductive electrode, a resin conductor layer, a heating element and an insulation layer. A shielding layer or a sheath can also be arranged outside the insulation layer. In the invention, the formulas of the resin conductor layer and the heating element are improved, and through the implementation of the technical scheme of the invention, and the problems existing in the aspects that the power attenuation of the traditional heat tracing belt is serious, the starting current of the traditional heat tracing belt becomes big, the heat tracing belt is burnt out frequently, the performance is not stable and the like can be well solved. The invention greatly improves the performance of the heat tracing belt, has the advantages of small starting current and high heat tracing belt temperature and is suitable for the industrial application.

The invention provides control method and device for assistant electrical heating of an air conditioner. The method comprises the following steps: an over-zero signal detecting module detects the over-zero time of electric source signals; and a main control module controls the conducting time of a switch module according to the over-zero time to adjust voltage applied to both ends of an assistantelectrical heating module of the air conditioner.

The invention provides a double feed motor with an ac-dc-ac converter for speed control. The double feed motor adopts the ac-dc-ac converter instead of the conventional ac-ac converter, and designs a set of start scheme for stator-side short-circuit and rotor-side variable frequency combining the characteristic of the ac-dc-ac converter. The double feed motor combining the start scheme solves the problems in the prior art, effectively reduces the starting current of the motor, avoids the motor speed falling out of the regulating range of the converter during the switching process, simultaneously realizing starting with load.

The invention provides a method for providing given frequency in a motor starting phase. The method is characterized by at least comprising a beginning phase and an ending phase in the starting process of the motor; in the beginning phase, the given frequency is provided at continuously-increasing acceleration, the given frequency and the acceleration of the given frequency are zero at the beginning of the beginning phase; in the ending phase, the given frequency is provided at the continuously-decreased acceleration; and the given frequency is increased to target frequency and the acceleration of the given frequency is decreased to zero in the end of the ending phase. In the invention, the starting phase of the motor is divided into the beginning phase and the ending phase, the accelerations of the given frequency are zero when the beginning phase is started and the ending phase is ended, the problem that an electric fence generates the impact by using the traditional linear acceleration method due to the mutation of the acceleration can be solved, the smooth starting of the motor can be realized, the starting current can be reduced, the starting overcurrent tripping can be avoided and thereby the performance of the motor can be fully exerted.

An automatic variable-speed motor transmission mechanism for an electric tricycle and an electric vehicle comprises a motor, an automatic speed changer and a differential system. The automatic variable-speed motor transmission mechanism is characterized in that the automatic speed changer consists of a speed changer shaft, a driving gear, a sun gear fixing plate, a driving disc, a housing and a connecting plate, a motor shaft of the motor drives the speed changer shaft, the connecting plate is mounted at the other end of the speed changer shaft and connected with the housing, a planetary gear is mounted on the upper portion of the housing, the driving disc with a shoe is fixedly connected to the lower portion of the planetary gear, a tension spring is connected with the shoe, the driving disc is sleeved on the outside of the speed changer shaft by a driving disc spline, the planetary gear matches with a sun gear, the sun gear matches with the sun gear fixing plate, through holes on two sides of the sun gear fixing plate are fixed on a body of a gearbox, the driving disc is connected with the driving gear by a driving gear spline, the driving gear drives an intermediate gear, an intermediate driven gear drives a driven gear, the driven gear is connected with the differential system, and a differential spline sleeve is connected to a rear axle shaft of the electric vehicle.

The invention discloses an intelligent control device for mine-used emulsion pump station, comprising an intelligent control device master piece and an accessory, wherein the intelligent control device master piece is composed of a liquid distributing box component, a power accumulator, an output pressure sensor and a flame-proof intelligent controller; the liquid distributing box component comprises an emulsion tank, a clean water filter, a liquid distributing pump, an emulsified oil filter, a liquid distributing magnetic valve, a liquid distributing pump state sensor and an emulsified oil liquid level sensor; the accessory is composed of an emulsified liquid level sensor and a unloading electromagnetic valve; the sensor interface is connected with the emulsified liquid level sensor, and each unloading electromagnetic valve interface is connected with each control end of the unloading electromagnetic valve. The advantages of the invention lie in that by program setup of the intelligent control device component, the device realizes unloading and startup of an emulsion pump, achieves small starting current, small grid impact and stable motor startup, ensures accurate concentration proportioning for emulsion, lowers the cost, prolongs the service life of the emulsion pump, and has reasonable structure, simple appearance and convenient inlet and outlet lines.

The invention relates to a speed-regulating system for a switched reluctance motor specially used for an electric vehicle and belongs to the field of a power control system of the electric vehicle. The speed-regulating system is characterized in that an output end of a controller is connected with a control end of a power converter; an input end of the controller is connected with an external preset; the output end of the power converter is connected with the motor while the input end is connected with a storage battery; the number of poles of a stator/rotor of SRM (Switched Reluctance Motor) is 24/16; an output shaft of the switched reluctance motor is connected with a load; a sensor comprises a current detector and a position detector; the position detector is arranged in the switched reluctance motor; the output ends of the current detector and the position detector are respectively connected with the input end of the controller; the integrated consistency of the existing SRD (Switched Reluctance Driver) is specifically improved; the load characteristic of vehicle working condition is met; the instantaneous power is high; the overload capacity is high; the accelerating property is excellent; the speed adjustable range is wide; the fluctuating problem of low-speed torque of the motor is solved; the noise of the SRM is reduced; the service life of the battery is prolonged; the electricity-saving effect is obvious; and the demand on the motor for the electric vehicle is met.