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 discloses a pre-heating control method of an air conditioner compressor. The control method comprises the following steps of detecting the temperature of an outside machine of an air conditioner in real time; generating pre-heating current to perform pre-heating on the compressor when the temperature of the outside machine is smaller than a preset target temperature and an absolute value of the difference of the temperature of the outside machine and the preset target temperature is larger than or equal to a first temperature threshold value; adjusting the pre-heating current in the compressor pre-heating process according to the real-time temperature of the outside machine. By adopting the pre-heating control method, the pre-heating time can be shortened, the overall efficiency can be improved, the system energy efficiency performance can be improved, and starting current of the air conditioner compressor and the air conditioner system noise can be further reduced. The invention further discloses a pre-heating control device of the air conditioner compressor and the air conditioner provided with the pre-heating control device for the air conditioner compressor.

The invention relates to a wood electro-thermal floor with far infrared electro-thermal wave of health physiotherapy, which is installed conveniently and quickly. It comprises floor base and electrical heating layer. The technical point is that insulation thermal reflecting layer, far infrared electrical heating layer, insulation heat-transferring layer and solid-wood panel layer with face paint layer are set in turn upwards from the floor base. Because electro-thermal physiotherapy structure with far infrared electro-thermal wave of health physiotherapy is added on prior solid-wood floor, characteristics are shown as follows. Because the physiotherapy far infrared electro-thermal structure is set in the interlayer of floor, the thermal efficiency is high. The room is heated while physiotherapy wave absorbed by foot is provided for human. It is provided with high thermal efficiency, small starting current, no pollution, no noise, energy saving, good anti-aging performance and long service life. It also has the action that by infrared ray radiation of carbon fiber, human blood cycle is promoted; cell viability is strengthened and human health function is improved. It is killing two birds with one stone.

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.

The invention relates to disk-type DC motors, particularly to a disk-type coreless permanent-magnetic brushless DC motor. The technical scheme comprises that the disk-type coreless permanent-magnetic brushless DC motor comprises two housings which are connected in a sealed mode, two end covers correspondingly arranged on the housings, and two bearings correspondingly arranged on the end covers. Each end cover is provided with a stop flange which extends to the end surface of the corresponding bearing, and an O-shaped seal ring is arranged between each stop flange and the end surface of the corresponding bearing. The disk-type coreless permanent-magnetic brushless DC motor also comprises an armature winding, the armature winding is in a ring shape and comprises an arc-shaped first part away from the a shaft, an arc-shaped second part close to the shaft, and arc-shaped third parts connected between both ends of the first part and the corresponding ends of the second part; the connection line of the centers of the first part and the second part is disposed in the middle section of the armature winding; the inner diameter of the first part is 1.5-2 times as large as that of the second part. The disk-type coreless permanent-magnetic brushless DC motor has good sealing performance and a high magneto-electricity conversion rate.

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 discloses a motor and AMT (automated mechanical transmission) integration-based electric vehicle driving system and a motor and AMT integration-based electric vehicle driving method. The driving system comprises a driving motor, a motor controller, a transmission drive assembly, a gear selection and shifting execution mechanism and a controller for the gear selection and shifting execution mechanism, wherein the transmission drive assembly comprises driving and driven gears of four gears, two splined hubs, two jointing sleeves and an output sensor; the driving motor is a direct current brushless motor; an output shaft of the driving motor is provided with an internal spline; a shell of the driving motor is integrally and directly connected with a transmission case through fine thread screws after being positioned through fixing pins; the output shaft, with the internal spline, of the motor is positioned in the motor; an input shaft of a transmission is directly inserted into the motor to be connected with the output shaft, with the internal spline, of the motor. According to the system, a clutch is eliminated, so that power interruption time during gear shifting is reduced, and the cost is also lowered; the jointing sleeves and the gears of a target gear can be synchronized during gear shifting by actively regulating the speed of the driving motor, and a synchronizer with high requirements on materials is eliminated from the transmission, so that the cost is further lowered.

The invention discloses a manufacturing method of an electrothermal film. The manufacturing method comprises the following steps of A, preparing an electrothermal film treatment solution which comprises tin tetrachloride, titanium trichloride, antimony trichloride, calcium chloride, chromic oxide, manganese dioxide, nickel sesquioxide, isopropanol, alcohol and water, B, masking a substrate, C, heating the substrate to be 400-700 DEG C and then spraying the electrothermal film treatment solution on the substrate by a spray gun to form a semifinished electrothermal film, D, annealing the semifinished electrothermal film, and E, coating silver oxide paste on the surfaces of the two ends of the annealed semifinished electrothermal film, loading the semifinished electrothermal film into an electrode oven, baking and fusing the semifinished electrothermal film to form a whole, and obtaining the finished electrothermal film. The manufacturing method has the advantages that the stability of the electrothermal film is improved by adding antimony; the temperature resistance of the electrothermal film is improved by adding titanium; the infrared emitting ability of the electrothermal film is improved by adding nickel and manganese; and an adhesive force between the electrothermal film treatment solution and the substrate is increased by adding isopropanol.

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 relates to an intelligent climbing control system, an electric bicycle and a climbing control method of the electric bicycle. According to the main technical characteristics, the intelligent climbing control system comprises a bicycle data acquisition unit, a data analysis unit, a climbing decision unit and a motor control unit, and is mounted in the intelligent climbing electric bicycle; the climbing control method comprises the following steps: whether the bicycle line circuit reaches an initial current limiting value or not and whether the rolling handle voltage exceeds an effective highest value or not are judged; when the bicycle line circuit reaches the initial current limiting value and the rolling handle voltage exceeds the effective highest value, a climbing recognition stage is started; if the climbing torque is insufficient, a preset climbing program is started; when the exit requirements of the climbing program is met, an initial program is recovered. Through adoption of the intelligent climbing control system, the climbing road conditions can be intelligently recognized, so that the electric bicycle can not only be driven on level roads but also has sufficient power while climbing, the using performance of the electric bicycle is effectively improved, and the demands of a large number of users are better met.

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.

The invention relates to a wound rotor self-starting permasyn motor, which belongs to the technical field of permanent magnet motors. The wound rotor self-starting permasyn motor comprises a fan housing, a fan, a front bearing end cover, a front bearing, a front motor end cover, a rear bearing end cover, a stator winding, a shell, a stator core, a permanent magnet, a rotor core, a rotating shaft, a rotor winding, an electric brush, a slip ring, a rear motor end cover, a rear bearing and a magnetic shielding bridge. The wound rotor self-starting permasyn motor has the following advantages: a wound rotor structure can improve the starting performance of the permasyn motor, namely the starting torque, reduce the starting current, improve the force-energy index, and simultaneously reduce the motor slip ratio by removing the rotor resistance gradually, improve the capability of pulling into synchronism to adapt to the operating condition requirement on low speed and large torque of overload starting, prevent impact to an electric network due to overlarge starting current or the incapability of starting the motor due to undersize starting torque, and ensure the smooth pulling into synchronism of the motor at the same time.

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 air source heat pump water heater which comprises a refrigerating loop, a hot water loop and a controller, wherein an exhaust port of a compressor is connected with a main pipe orifice D of a four-way valve, and is connected with a liquid inlet hole of a heat exchanger through a valve pipe orifice C; a liquid outlet hole of the heat exchanger is connected with an inlet of an evaporator through a throttling device; an outlet of the evaporator is connected with a pipe orifice E of the four-way valve, and is connected with a suction hole of the compressor through a valve hole S; the air source heat pump water heater is characterized in that the compressor is a variable frequency compressor; an auxiliary cooling pipeline is connected between an air suction pipeline of the compressor and a liquid outlet of the heat exchanger; the pipeline is formed by connecting an electromagnetic valve and a liquid spray capillary tube; an exhaust pipeline of the compressor is provided with a row of temperature sensors; and the row of temperature sensors are used for measuring the temperature for controlling the electromagnetic valve to be opened and closed. By adopting the variable frequency compressor and being matched with the auxiliary cooling pipeline, the air source heat pump water heater leads the compressor to work normally in the environment with low temperature, ensures the hot water supply to be stabler, and has wider application scope.

The invention relates to a soft start method of an efficient self-starting permanent magnet synchronous motor, which is characterized in that the rotor of the efficient self-starting permanent magnet synchronous motor is provided with a squirrel cage winding used for asynchronous self-starting and a permanent magnet pole; the stator of the efficient self-starting permanent magnet synchronous motor is provided with a set of pole-changing simplex windings with bipolar numbers; the permanent magnet pole numbers of the rotor are equal to twice of pole numbers of less connecting windings of the pole-changing windings; the pole numbers of multipolar connecting windings are equal to the permanent magnet pole numbers of the rotor, so that the permanent magnet synchronous motor can realize asynchronous self-starting in an asynchronous motor state and operates at a synchronous speed in a state approximate to the synchronous speed state, the soft self-starting of the efficient self-starting permanent magnet synchronous motor is realized, the efficient self-starting permanent magnet synchronous motor has the characteristics of large starting torque, small starting current, small mechanical vibration and the like, and the starting performance of the efficient self-starting permanent magnet synchronous motor is improved.

The invention discloses a motor soft start and dynamic reactive power compensation method which is characterized in that soft start and dynamic reactive power compensation of a motor are combined to share a full-control device; the reactive power compensation consists of dynamic reactive power compensation and static reactive power compensation; the soft start consists of a rectification module, a filter circuit and an inverter module; through a controller and a signal detection module, the inverter module is controlled to realize frequency-conversion voltage-regulation output, so that the soft start of the motor can achieve the requirements of small current and large torque; during the dynamic reactive power compensation, the rectification module is removed, and the full-control device is controlled to realize the dynamic reactive power compensation according to the reactive power condition; and the investment or removal of a fixed capacitance is controlled by utilizing a power switch, the static reactive power compensation is realized. The method provided by the invention has the advantages of small start current, large torque, safety and reliability in start, rapid reactive power compensation and accuracy in tracking, and the whole device cost is reduced.

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 provides a rectifier soft start circuit and a control method thereof. The circuit is arranged between the rectifier and a load, and comprises a first capacitor, a current-limiting unit, a relay and a DSP processor; one end of the current-limiting unit, one end of the relay, one end of the load and the positive DC bus of the rectifier are connected together; the other end of the load, the cathode of the first capacitor and the negative DC bus of the rectifier are connected together; the anode of the first capacitor, the other end of the current-limiting unit and the other end of the relay are connected together; and the DSP processor is used for controlling on and off of the relay. When the current-limiting unit is an IGBT transistor, the control method comprises steps: the DSP processor controls on and off of the IGBT transistor, charging and discharging of the first capacitor are thus controlled, the first capacitor is directly parallelly connected with the load, and thus start of the rectifier circuit is completed. By adopting the technical scheme of the invention, impact current in the case of start can be eliminated, and the start is quick.

This invention discloses a sort of soft startup control set which can settle the voltage rebound and radiance of the air condition, it relates to the area of the air condition technique and settle the bug that the electricity is too big when air condition startup in existing technique. This set consists ofthe electron circuitry connected in the compressor of the air condition: the main winding after the silicon control connects with the normal open port of the relay with a reamer and two flings in parallel they connect with the compressor in series, the startup capacitance, the discharge resistance connected with the startup in parallel, the negative temperature coefficient ceramics heat-variable element connected with the startup capacitance, the normal close port of the relay with a reamer and two flings, and after it connects with the running capacitance in parallel they connect with the subsidiary winding of the compressor. Hereinbefore they connect between the zero line and the front line by the common port of the compressor after connected with them in parallel. The control pole of the silicon control connects with the main control chip and peripheral circuit which consists ofthe DC power circuit, the voltage check circuit, the zero cross detection circuit and the control relay with a reamer and two flings loop circuit. It can debase effectively the startup electricity of the air condition and augment the startup torsion when the compressor operates at low voltage in this invention.

A mining local ventilation machine with a detachable plastic structure comprises an inlet silencer 1, a main machine body 2, an outlet silencer 3 and a base 4, and is detachable, wherein internal cylinders and conical cylinders of the inlet silencer and outlet silence are porous plastic sheets and coated with sound absorption cotton to eliminate part of radiation noise and discrete noise generated by rotation to achieve the silencing effect; the internal cylinders and the external cylinders of the inlet silencer and the outlet silencer are detachable, after being damaged or used for a long time, internal parts are maintained after being detached, small silencing holes blocking the internal cylinders and the conical cylinders are washed, or the sound absorption cotton is replaced, the operation is simple and convenient, most parts are formed through plastic injection moulding, the weight is reduced greatly, the carrying and mounting are facilitated, the sound insulation effect of the plastic is good, and the damping performance is high.

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.