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571 results about "Electric power conversion" patented technology
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In electrical engineering, power engineering, and the electric power industry, power conversion is converting electric energy from one form to another such as converting between AC and DC; or changing the voltage or frequency; or some combination of these. A power converter is an electrical or electro-mechanical device for converting electrical energy. This could be as simple as a transformer to change the voltage of AC power, but also includes far more complex systems. The term can also refer to a class of electrical machinery that is used to convert one frequency of alternating current into another frequency.
Amplification Relay Device of Electromagnetic Wave and a Radio Electric Power Conversion Apparatus Using the Above Device
ActiveUS20080266748A1Improve throughputMultiple-port networksNear-field transmissionElectric power transmissionImpedance matching
The present invention provides an amplifying repeater, which is constructed in such a manner that a ferrite core is inserted into a coil with a pre-determined number of winds to increase an induced electromotive force caused by an increase in flux linkage using a time-varying magnetic field of electromagnetic waves at a position distant from various electromagnetic wave generating sources by a predetermined distance and the induction coil and a variable condenser for inducing resonance are connected to each other to increase current while reducing a resistant component existing in the induction coil to intensify and amplify the magnetic field of electromagnetic waves. Furthermore, the present invention provides a wireless power conversion charging device using the magnetic field of electromagnetic waves, which is located between an electromagnetic wave generating source transmitter and a receiving coil or attached to the transmitter and receiving coil. The wireless power conversion charging device includes a rectifying diode for rectifying an electromotive force induced in a construction in which a resonance and impedance matching variable condenser is connected to a coil in series or in parallel in order to transmit maximum induced power to a charging battery that is a load using electromagnetic waves amplified by the amplifying repeater, and a smoothing condenser for smoothing the rectified voltage. Accordingly, charging power required for various small power electronic devices can be provided and power can be supplied to various loads.
Owner:JC PROTEK +1
Amplification relay device of electromagnetic wave and a radio electric power conversion apparatus using the above device
ActiveUS7885050B2Increase forceGuaranteed normal transmissionNear-field transmissionBatteries circuit arrangementsElectric power transmissionImpedance matching
The present invention provides an amplifying repeater, which is constructed in such a manner that a ferrite core is inserted into a coil with a pre-determined number of winds to increase an induced electromotive force caused by an increase in flux linkage using a time-varying magnetic field of electromagnetic waves at a position distant from various electromagnetic wave generating sources by a predetermined distance and the induction coil and a variable condenser for inducing resonance are connected to each other to increase current while reducing a resistant component existing in the induction coil to intensify and amplify the magnetic field of electromagnetic waves. Furthermore, the present invention provides a wireless power conversion charging device using the magnetic field of electromagnetic waves, which is located between an electromagnetic wave generating source transmitter and a receiving coil or attached to the transmitter and receiving coil. The wireless power conversion charging device includes a rectifying diode for rectifying an electromotive force induced in a construction in which a resonance and impedance matching variable condenser is connected to a coil in series or in parallel in order to transmit maximum induced power to a charging battery that is a load using electromagnetic waves amplified by the amplifying repeater, and a smoothing condenser for smoothing the rectified voltage. Accordingly, charging power required for various small power electronic devices can be provided and power can be supplied to various loads.
Owner:JC PROTEK +1
Electric Power Conversion Apparatus
ActiveUS20090231811A1Reduce the burden onImprove cooling effectHybrid vehiclesAC motor controlWater channelEngineering
An electric power conversion apparatus includes: a channel case in which a cooling water channel is formed; a double side cooling semiconductor module that comprises an upper and lower arms series circuit of an inverter circuit; a capacitor module; a direct current connector; and an alternate current connector. The semiconductor module comprises a first and a second heat dissipation metals whose outer surfaces are heat dissipation surfaces, the upper and lower arms series circuit is disposed tightly between the first heat dissipation metal and the second heat dissipation metal, and the semiconductor module further comprises a direct current positive terminal, a direct current negative terminal, and an alternate current terminal which protrude to outside. The channel case is provided with the cooling water channel which extends from a cooling water inlet to a cooling water outlet, and a first opening which opens into the cooling water channel.
Owner:HITACHI ASTEMO LTD
Integrating sphere photovoltaic receiver (powersphere) for laser light to electric power conversion
A photovoltaic module for converting laser radiation from a laser emitting light at a wavelength to electrical power is provided. The module comprises: (a) a housing having a cavity of generally optimized closed shape inside the housing, the cavity having an internal surface area As and including an opening for admitting the laser radiation into the cavity, the opening having an entrance aperture area Ai that is substantially smaller than As; and (b) a plurality of photovoltaic cells within the cavity, the photovoltaic cells having an energy bandgap to respond to the wavelength and generate the electrical power.
Owner:ORTABASI UGUR
Power module and production method thereof
ActiveUS7057896B2Improve reliabilityEfficient heatingSemiconductor/solid-state device detailsSolid-state devicesEngineeringElectronic component
A power module of the present invention mounts electronic components and comprises a circuit board that constitutes an electric power conversion circuit along with the above-mentioned electronic components; a heat sink; and a member with insulation characteristics and high thermal conductivity, which is disposed between plural devices with high heating value among the above-mentioned electronic components and the above-mentioned heat sink, embeds at least part of each of the above-mentioned plural devices with high heating value therein and transfers heat from the above-mentioned plural devices with high heating value to the above-mentioned heat sink.
Owner:PANASONIC CORP
Electric power conversion apparatus
ActiveUS7978471B2Reduce the burden onImprove cooling effectHybrid vehiclesAC motor controlWater channelAlternating current
An electric power conversion apparatus includes: a channel case in which a cooling water channel is formed; a double side cooling semiconductor module that comprises an upper and lower arms series circuit of an inverter circuit; a capacitor module; a direct current connector; and an alternate current connector. The semiconductor module comprises a first and a second heat dissipation metals whose outer surfaces are heat dissipation surfaces, the upper and lower arms series circuit is disposed tightly between the first heat dissipation metal and the second heat dissipation metal, and the semiconductor module further comprises a direct current positive terminal, a direct current negative terminal, and an alternate current terminal which protrude to outside. The channel case is provided with the cooling water channel which extends from a cooling water inlet to a cooling water outlet, and a first opening which opens into the cooling water channel.
Owner:HITACHI ASTEMO LTD
Electric power conversion apparatus, power storage system and power storage method
ActiveUS20140077756A1Decrease in electric power conversion efficiencyReduce wasteBatteries circuit arrangementsElectric powerDc dc converterLow voltage
Owner:SHARP KK
Internal combustion engine start controller
InactiveUS20070175429A1Reduce loadAvoid yield lossElectrical controlMuscle operated startersPower semiconductor deviceElectric power system
An internal combustion engine start controller in a vehicle that includes: a power source; an internal combustion engine that is started by using electric power supplied from the power source; a first motor; and a first electric power converter that is constructed so as to be able to perform electric power conversion between the power source and the first motor through switching control of power semiconductor elements is provided. The start controller includes: a start detecting device for detecting whether the engine is in a starting operation; and a first frequency setting device that, when the engine is in a starting operation, sets a switching frequency of the first electric power converter to a frequency lower than that used when the engine is not in a starting operation.
Owner:TOYOTA JIDOSHA KK
Semiconductor device and electric power conversion device
InactiveUS6525950B1Conversion constructional detailsSolid-state devicesElectrical conductorElectric power conversion
A semiconductor power conversion device includes two bridge-connected semiconductor switches, an output terminal, and first and second pairs of positive and negative direct current terminals. First conductors connect the negative direct current terminals of the first and second pairs with the output terminal through one of the two bridge-connected semiconductor switches, while second conductors connect the positive direct current terminals of the first and second pairs with the other of the two bridge-connected semiconductor switches. A housing is provided, which includes the two bridge-connected semiconductor switches, and at least a portion of the first conductor and of the second conductor as a multilayer structure formed by sandwiching an insulator between the first and second conductors inside the housing. The first and second pairs of direct current terminals are arranged on one side of one plane of the housing.
Owner:HITACHI LTD
Discharging control device for electric power conversion system
ActiveUS20110221374A1Avoid diagnostic resultReduce heatAc-dc conversionApparatus without intermediate ac conversionCapacitor voltageLow voltage
A discharge control device in an electric power conversion system mounted to a motor vehicle turns off a relay in order to instruct an electric power conversion circuit to supply a reactive current into a motor generator, and thereby to decrease a capacitor voltage to a diagnostic voltage. After this process, the discharge control device outputs an emergency discharging instruction signal dis in order to turn on both power switching elements at high voltage side and a low voltage side in the electric power conversion circuit. This makes a short circuit between the electrodes of the capacitor in order to discharge the capacitor, and executes a discharging control to detect whether or not an emergency discharging control is correctly executed and completed. The discharge control device detects whether or not the electric power stored in the capacitor is discharged on the basis of the voltage of a voltage sensor.
Owner:DENSO CORP
Isolated high power bi-directional dc-dc converter
InactiveUS20080304292A1Ac-dc conversion without reversalDc-dc conversionElectric power transmissionPower capability
A bi-directional dc-dc converter is provided that may provide voltage conversion for two separate electrical power systems. The two electrical power systems may have different functions, electrical requirements and power transfer directions. The bi-directional dc-dc converter may include back-to-back bi-directional dc-dc converter circuits isolated from each other by a transformer. Multiple such dc-dc converters may be connected in parallel to increase power capability. Phase shift pulse width modulation (PWM) may be used to switch the parallel dc-dc converters so as to decrease both voltage ripple and current ripple. The number of dc-dc converters may be modified to meet the different needs of various electric power systems. A single bi-directional dc-dc converter of the invention may be employed to provide electric power conversion for multiple electric power systems, even where those systems have different power requirements and different power transfer directions.
Owner:HONEYWELL INT INC
Cooling device for electronic component and power converter equipped with the same
InactiveUS20080239663A1Avoid thermal interferenceEasy to superviseSemiconductor/solid-state device detailsSolid-state devicesCoolant flowElectronic component
A cooling device for cooling an electronic component (semiconductor module) includes a cooling tube adapted to be disposed in contact with the electronic component and having an internal coolant flow channel for the passage therethrough of a cooling medium, and a high-pressure tube disposed adjacent to a surface of the cooling tube that faces away from the electronic component, the high-pressure tube having a hollow interior that can be filled with a high-pressure fluid having a pressure higher than that of the cooling medium. An electric power conversion device comprised of a plurality of semiconductor modules and the cooling device as means for cooling the semiconductor modules is also disclosed.
Owner:DENSO CORP
Single module electric power conversion apparatus
InactiveUS6888729B2Reduce weightImprove reliabilityLocalised screeningElectric motor controlPower semiconductor deviceMiniaturization
To perform a miniaturization and weight reduction of an electric power conversion apparatus, and in extension, the miniaturization of an inverter apparatus itself. In the inverter apparatus which converts a DC voltage into an AC voltage, a semiconductor device for electric power conversion, and a drive and protection circuit which drives and protects this semiconductor device for electric power conversion, and a power supply circuit which supplies power to this drive and protection circuit are integrated in the same module.
Owner:MITSUBISHI ELECTRIC CORP
Semiconductor device and power conversion apparatus using the same
ActiveUS20070051974A1Reduce inductanceSemiconductor/solid-state device detailsSolid-state devicesElectricityDevice material
The power conversion apparatus uses the semiconductor device. Said semiconductor device includes a first group of power semiconductor elements at least one of which is electrically connected between a first potential and a third potential, a second group of power semiconductor elements at least one of which is electrically connected between a second potential and the third potential, and a third group of power semiconductor elements at least one of which is electrically connected between the first potential and the third potential. The second group is disposed between the first group and third group. Thereby, a low-loss semiconductor device having both inductance reducibility and heat generation balancing capability and also an electric power conversion apparatus using the same is provided.
Owner:HITACHI LTD
Cooling device for electronic component and power converter equipped with the same
InactiveUS7965508B2Avoid thermal interferenceEasy to superviseSemiconductor/solid-state device detailsSolid-state devicesCoolant flowComputer module
A cooling device for cooling an electronic component (semiconductor module) includes a cooling tube adapted to be disposed in contact with the electronic component and having an internal coolant flow channel for the passage therethrough of a cooling medium, and a high-pressure tube disposed adjacent to a surface of the cooling tube that faces away from the electronic component, the high-pressure tube having a hollow interior that can be filled with a high-pressure fluid having a pressure higher than that of the cooling medium. An electric power conversion device comprised of a plurality of semiconductor modules and the cooling device as means for cooling the semiconductor modules is also disclosed.
Owner:DENSO CORP
Home energy management system
ActiveCN104615119AGuarantee the safety of electricity useImprove household energy efficiencyComputer controlNetwork topologiesElectricityRemote control
The invention discloses a home energy management system. The home energy management system comprises a two-way metering module, an electric power cloud identification module, an energy management module, an electric power conversion module, an integrated fault monitoring module, a home management module, a security and protection monitoring module, a multi-communication module and a display module. The home energy management system can effectively ensure household electricity safety and improve household energy efficiency, achieves information exchange of intelligent home and intelligent remote control devices through the multi-communication module, supports query and control of household energy efficiency states through various terminals, such as mobile phones, WeChat and PC, effectively replaces multiple equipment, such as traditional household distribution boxes, routers, energy efficiency terminals and various controllers and has broad application prospects.
Owner:南京昊飞软件有限公司
Electric power conversion system
ActiveUS8159820B2Improve electrical performanceImprove cooling effectSemiconductor/solid-state device detailsConversion constructional detailsDriver circuitMiniaturization
In the present invention, miniaturization of an electric power conversion system is made possible while the reduction of a rise in temperature is achieved through a cooling operation by a cooling fan. The electric power conversion system is provided with a casing for covering cooling fins for cooling power semiconductors, a main circuit board having a driver circuit for driving the power semiconductors, and a cover for covering up the main circuit board. The system includes a first airflow hole provided at a part of the main circuit board, on the upper side of an air-intake provided in the cover, and a second airflow hole provided on the lower side of the first airflow hole, and on the lower side of the cooling fins, wherein air from the second airflow hole is driven to the cooling fins by a cooling fan.
Owner:HITACHI IND EQUIP SYST CO LTD
Isolated high power bi-directional DC-DC converter
InactiveUS7830686B2Ac-dc conversion without reversalDc-dc conversionElectric power transmissionPower capability
A bi-directional dc-dc converter is provided that may provide voltage conversion for two separate electrical power systems. The two electrical power systems may have different functions, electrical requirements and power transfer directions. The bi-directional dc-dc converter may include back-to-back bi-directional dc-dc converter circuits isolated from each other by a transformer. Multiple such dc-dc converters may be connected in parallel to increase power capability. Phase shift pulse width modulation (PWM) may be used to switch the parallel dc-dc converters so as to decrease both voltage ripple and current ripple. The number of dc-dc converters may be modified to meet the different needs of various electric power systems. A single bi-directional dc-dc converter of the invention may be employed to provide electric power conversion for multiple electric power systems, even where those systems have different power requirements and different power transfer directions.
Owner:HONEYWELL INT INC
Electric power conversion device, compressor motor with the device, and air conditioner with the motor
InactiveUS20090323232A1Process safetySafe electric power conversion deviceMotor/generator/converter stoppersSynchronous motors startersDc currentElectric power conversion
The device is provided with an electric power conversion circuit including switching elements for converting a DC electric power to an AC electric power, a load connected to an output side of the electric power conversion circuit, means for detecting a current flowing through a DC side in the electric power conversion circuit, a voltage command value preparing means for controlling the operation of the switching elements in the electric power conversion circuit and a wire breaking detecting means. The wire breaking detection means judges a wire breaking in the load or an abnormality of any of the switching elements in the electric power conversion circuit by making use of a DC current detection value in a period when a current of maximum voltage phase or of voltage minimum phase of the electric power conversion circuit is flowing in a DC current.
Owner:HITACHI LTD +1
Fuel cell air supply system and control method
InactiveCN108172866AProvide accuratelyReduce volumeFuel cell heat exchangeElectrochemical responseFuel cells
The invention discloses a fuel cell air supply system. The fuel cell air supply system comprises a fuel cell pile used for performing power generation through an electrochemical reaction, an air compressor used for conveying air to the fuel cell pile, a motor used for driving the air compressor to work, an electric power conversion apparatus used for regulating the electric power supplied to the motor, a temperature regulation apparatus and a humidity regulation apparatus used for regulating the temperature and humidity of the supplied air to satisfy target parameters, a sensor assembly used for measuring the pressure, temperature, humidity and flow of the supplied air, and the rotary speed of the air compressor, a bypass branch used for discharging the residual air in the flow, a bypass valve used for controlling the starting area of the bypass branch, an air filtering apparatus used for filtering impurities from the supplied air, and a controller used for controlling operation of each module. By taking a negative electrode air inlet system as one integrated body to perform independent consideration and control, air with the most suitable parameters is supplied to the fuel cell pile accurately.
Owner:PINGXIANG HUICHENG PRECISION MACHINERY & ELECTRONICS
Electric power conversion apparatus
ActiveUS20150236611A1Low costSmall sizeAc-dc conversion without reversalConversion without intermediate conversion to dcTransformerThree-phase
An electric power conversion apparatus according to an embodiment includes, wherein when a constituent element constituted of a leg in which two switching elements provided with self-arc-extinguishing capability are connected in series, and a capacitor connected in parallel with the leg is made a converter unit, and a constituent element formed by connecting one or more converter units in series is made a phase arm, a phase arm on the positive side, a single-phase four-winding transformer, and a phase arm on the negative side are included in each of three phases, one end of the phase arm on the positive side is connected to the positive side of a secondary winding of the four-winding transformer, and the other end thereof is connected to a DC positive side terminal.
Owner:KK TOSHIBA
Vehicle electric-power conversion apparatus
ActiveUS20080225565A1Simple configurationControl of the switching elements can more stably be performedBatteries circuit arrangementsAc-dc conversionEngineeringElectric power conversion
The objective of the present invention is to obtain a vehicle electric-power conversion apparatus in which high-efficiency rectification operation can be realized, by detecting in real time a change, due to a fluctuation in a load, in a phase at which a switching element is turned on / off and by changing the phase at which the switching element is turned on / off, in response to the change. A diode-on timing and a diode-off timing corresponding to the diode conduction state of a diode connected in parallel with a switching element are detected; the values of rotor-position signals corresponding to the timings are sequentially stored; based on the stored values of rotor-position signals, a switching-element-on timing and a switching-element-off timing are calculated; and based on the timings, a gate command signal for the switching element is created.
Owner:MITSUBISHI ELECTRIC CORP
Electric power conversion device
ActiveCN101188387AHigh-precision detectionSuppression of higher harmonic componentsAC motor controlDc-ac conversion without reversalPhase currentsHarmonic
The present invention provides a power conversion device, comprising: a PWM control unit (9), which compares a three-phase AC signal (Vum*, Vvm*, Vwm*) with a triangular wave carrier signal to generate a pulse width modulated wave; a power converter the main circuit part (3), which drives the switching element according to the pulse width modulation wave, and converts the DC voltage into a three-phase AC voltage; and the current detection part (5, 6), which is in the main circuit part of the power converter The DC input side detects the DC bus current to reproduce the phase current; the power conversion device also includes a voltage command change part (8), which uses an odd number of units of 3 or more as the voltage command change period, and the unit period is a triangular wave carrier signal monotonous During the period of increase or monotonous decrease, a correction signal whose average value of the correction amount in the voltage command change period is zero or approximately zero is added to the three-phase AC signal. As a result, the DC bus current is detected with high precision, and harmonic components are suppressed.
Owner:HITACHI POWER SEMICON DEVICE
Electric power conversion apparatus
ActiveUS20140284765A1Avoid temperature riseExtended service lifeConversion constructional detailsSemiconductor/solid-state device detailsEngineeringElectric power conversion
An electric power conversion apparatus includes a stacked body, a capacitor, a metal frame and a case. The stacked body is formed by stacking semiconductor modules with coolant passages formed therebetween. The frame has both the stacked body and the capacitor fixed therein. The case has all of the stacked body, the capacitor and the frame received therein. Further, the frame has a separation wall that separates the stacked body and the capacitor from each other, a stacked body-surrounding wall that surrounds the stacked body with the help of the separation wall, and a capacitor-surrounding that surrounds the capacitor with the help of the separation wall. The capacitor has a pair of end portions that are opposite to each other in a predetermined direction, in which control terminals of the semiconductor modules of the stacked body protrude, and each at least partially exposed from the capacitor-surrounding wall of the frame.
Owner:DENSO CORP
Motor control device, compressor, air conditioner and program
ActiveCN105529978AReduce noiseReduce vibrationElectronic commutation motor controlVector control systemsResponse FrequencyMotor control
The invention provides a motor control device, a compressor, an air conditioner and a program. In a motor control device applied in an air conditioner and the like, restriction on response frequency of the motor control device can be compensated and noise or vibration of a motor can be reduced. The motor control device is provided with an electric power conversion circuit and a control part. The electric power conversion circuit converts direct-current voltage into alternating-current voltage and drives a motor connected with a load device via the alternating-current voltage. The control part outputs a driving signal used for driving the electric power conversion circuit, presumes a rotation angle position (a shaft error delta theta c) of the motor and changes the duty ratio of the driving signal according to a presumed or preset load changing mode (differential torque presumed value delta tm^) and the rotation angle position (shaft error delta theta c).
Owner:HITACHI APPLIANCES INC
Amplification Relay Device Of Electromagnetic Wave And A Radio Electric Power Conversion Apparatus Using The Device
ActiveUS20110176251A1Increase forceGuaranteed normal transmissionNear-field transmissionBatteries circuit arrangementsElectric power transmissionImpedance matching
Owner:JC PROTEK +1
Control apparatus for electric rotating machine
InactiveUS20110210687A1Minimize changesSimple control logicSingle-phase induction motor startersSynchronous motors startersElectric machineEngineering
A control apparatus for use with an electric power conversion system which is equipped with a dc / ac converter connected to an electric rotating machine and a capacitor joined to input terminals of the dc / ac converter. The control apparatus stores an angle of rotation (i.e., start angle θ0) of the electric rotating machine before start of control of energization of the electric rotating machine to discharge the capacitor and determines command currents idr and iqr which will result in zero (0) torque in the electric rotating machine. The control apparatus includes a command current correcting circuit which corrects the command currents idr and iqr by a difference between a current angle θ of rotation of the electric rotating machine and the start angle θ0, thereby avoiding constant rotation of the electric rotating machine when the capacitor is discharged.
Owner:DENSO CORP
Harmonic neutralized frequency changer
ActiveUS6882550B1Conversion without intermediate conversion to dcDc-ac conversion without reversalPower qualityFrequency changer
A power converter that produces variable frequency multiphase AC power from fixed or variable frequency AC power. The converter can be used to drive an AC motor for propulsion applications or other motors and loads that require variable frequency AC power. The power converter system is based on a combination of several power conversion technologies used in a power circuit topology and a regulator control system that allows for higher electrical efficiency, higher power density and lower power distortion to be achieved than is possible from any of the individual technologies. Specifically, the input and output power distortion of a frequency changer is monitored, and a group of high performance inverters are used to inject harmonic currents into a specially designed transformer to neutralize the power distortion to a specified acceptable level. By this neutralization, the power density of a solid-state electric power converter is increased (e.g., by a factor of 5-6) and power quality distortion is reduced (e.g., below 0.1%). These features are especially useful in the electric power conversion markets particularly for surface ship and submarine propulsion drive applications.
Owner:CURTISS WRIGHT ELECTRO MECHANICAL
Distributed electric power generation system, control station, and method of controlling the same
ActiveUS20150318698A1Low running costImprove efficiencyMechanical power/torque controlLevel controlElectric power transmissionGrid network
A distributed electric power generation system is configured to include a plurality of electric power distribution stations operable to receive electric power from an external power source and generate electric power in a balanced manner, a power transmission grid network connected to the plurality of electric power distribution stations for supplying received electric power to a plurality of demand loads using electric power, and a control station operable to acquire information on an electric power distribution period used to calculate a period during which electric power supply is needed, acquire an amount of power supply demand to be supplied via the power transmission grid network during the period during which electric power supply is needed, the period being determined from the acquired information on the electric power distribution period, and select one or a required number of electric power generation facilities for supplying electric power to the plurality of demand loads at a low cost based upon a start and stop cost and a running cost of each of the electric power distribution stations in accordance with the calculated electric power distribution period and the amount of power supply demand.
Owner:NEC CORP
Megawatt-stage vertical shaft wind power generator with adjustable attack angle
InactiveCN102116264AAdjust windward angleAutomatic adjustment of windward angleWind motor controlSingle network parallel feeding arrangementsMaximum torqueLightning rod
The invention provides a megawatt-stage vertical shaft wind power generator with an adjustable attack angle. The vertical axis wind power generator comprises an electric power conversion device, a speed increasing box, a power generator, a variable pitch motor, a main vertical shaft, a cantilever cylinder, blade crossbeams, and blades with airfoils, wherein the cantilever cylinder is sleeved on the outer side of the main vertical shaft; the main vertical shaft is connected with the cantilever cylinder through a bearing; one end of each blade crossbeam is fixed on the cantilever cylinder, and blade autorotation devices are mounted at the other end of each blade crossbeam; a lightning rod is mounted at the top end of the main vertical shaft; an anemoscope is connected with an electronic control device; and the electronic control device controls the blade autorotation devices on each cantilever crossbeam, so as to enable the blades to adjust the windward angles according to a preset program and enable the power generator to be throughout in a state capable of producing the maximum torque. The starting wind speed is effectively reduced, and the wind energy utilization rate is increased.
Owner:杨寿生
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