41results about How to "Output power unchanged" patented technology

The invention discloses a rotor structure for a high speed permanent magnet synchronous machine. The rotor structure comprises an electric machine rotor and a rotating shaft, wherein a protection layer is arranged at the outermost layer of the electric machine rotor; the rotating shaft is arranged at the center of the electric machine rotor; permanent magnets are arranged between the rotating shaft and the protection layer; the permanent magnets are divided into an inner layer and an outer layer; the permanent magnet at the outer layer is a ferrite permanent magnet; the permanent magnet at the inner layer is a rare earth permanent magnet; the number of poles of the ferrite permanent magnet is p1, the number of poles of the rare earth permanent magnet is p2, and P1 is equal to P2; and the central lines of the same poles of the two layers of permanent magnets are coincident. According to the rotor structure, the advantages of residual magnetism and low conductivity of the ferrite permanent magnet and the advantage of high residual magnetism of the rare earth permanent magnet are fully combined, the ferrite permanent magnet and the rare earth permanent magnet are matched according to a certain thickness ratio, so that the vortex loss of the rotor is reduced and the heat dissipation difficulty of the electric machine is reduced on the premise of guaranteeing the needed magnetic field generation ability, and furthermore, through the reasonable design, a problem of large volume of the electric machine, which is caused by entirely using the ferrite permanent magnet material, or large vortex loss of the electric machine, which is caused by entirely using the rare earth permanent magnet material, is solved.

The invention relates to the technical field of lasers, and discloses a laser optical shutter and a laser. The laser shutter comprises a laser input interface, a collimating lens, a plurality of laseroutput interfaces, a plurality of coupling lenses, and a plurality of light path switching assemblies, wherein each light path switching assembly comprises a rotary reflector and a fixed reflector, the plurality of rotary reflectors are installed on an incident light path of the laser input interface through corresponding first inclination angle adjusting mechanisms, and each fixed reflector is installed on an emergent light path of the laser output interface through a corresponding second inclination angle adjusting mechanism; a rotating shaft of the rotary reflector is connected to a rotarydriving mechanism, and the rotary driving mechanism is used for driving the rotary reflector to be switched between a light path connection position and a light path disconnection position. Accordingto the laser optical shutter, light path switching is achieved by rotating the rotary reflector, the stability is high, the switching speed is high, the inclination angle of the rotary reflector andthe inclination angle of the fixed reflector are independently adjusted, deflection adjustment does not need to be conducted on the coupling lens any more, and the adjustment difficulty is reduced.

A positive and negative sequence decoupling control method for low-voltage ride-through compatible with a grid-connected photovoltaic inverter comprises the following steps: (1) a detected grid voltage is decomposed into a positive sequence component and a negative sequence component by a positive and negative sequence decoupling method, the output current of the inverter is also decomposed into a positive sequence component and a negative sequence component, and the components are controlled; and (2) the positive sequence component of the output current of the inverter is made to track the positive sequence component of the grid voltage, and the negative sequence component of the output current of the inverter is controlled to be zero so as to enable the inverter to correctly calculate the phase of the grid voltage in real time according to the drop of the grid voltage to realize phase control of the output current. The true phase of the grid voltage during low-voltage ride-through is detected by the positive and negative sequence decoupling method. Moreover, the positive sequence component and the negative sequence component of the current are controlled, and the power factor output by the inverter during low-voltage ride-through is precisely controlled. The same active current as normal operation can be output at low voltage, the output power remains unchanged, and the stability of the grid is maintained to the maximum.

The invention discloses an optical sensor on the basis of cascade connection of double resonant cavities. The optical sensor comprises a broadband light source and the two resonant cavities. The surfaces of one of the resonant cavities are in contact with to-be-measured liquid, and the resonant cavity is a reference resonant cavity; a surface of the other resonant cavity is modified by a biological molecular film, and the other resonant cavity is in contact with the to-be-measured liquid and is a sensing resonant cavity; the two resonant cavities are coupled with each other by a common straight waveguide. The optical sensor has the advantages that to-be-measured substances in the to-be-measured liquid can be adsorbed by the biological surface film of the sensing resonant cavity, the effective refractive index of the sensing resonant cavity can change, but the effective refractive index of the reference resonant cavity does not change, accordingly, spectra generated after cascade connection is carried out on the two resonant cavities change, and output light intensity can ultimately change; change of output power can be measured, and accordingly content information of the to-be-measured substances in the to-be-measured liquid can be acquired.

The invention discloses a power invariant principle-based short circuit fault fault-tolerant control method for a four-phase permanent magnet motor with a 90-degree phase belt angle, belongs to the field of multi-phase fault-tolerant permanent magnet motors and aims at solving the technical problems that a conventional four-phase permanent magnet synchronous motor with the 90-degree phase belt angle is low in torque output capability and large in torque ripple in a one-phase short circuit fault. According to the method, output power of the motor is maintained constant through adjusting currentof other non-short circuit phases when an end short circuit fault occurs in the motor. When short circuit faults of switch tubes occur in the motor, the switch tubes at the same positions of oppositebridge arms are firstly controlled to be conducted and the current of the other non-short circuit phases is adjusted to maintain the output power of the motor constant. According to the method, the influence on the motor in the short circuit faults of the switch tubes of an inverter is reduced and the subsequent fault-tolerant control difficulty is reduced.

The embodiment of the invention provides a stroboscopic-free LED lighting circuit which comprises an LED lamp set module, a work voltage keeping module, a constant-current control module and a control unit. The LED lamp set module is divided into a plurality of dynamic matrixes, the constant-current control module is controlled by the control unit to turn on or turn off corresponding LED lamp sets and control current of the corresponding LED lamp sets to be constant, and the control unit can control the constant-current control module to achieve switching between the dynamic matrixes according to voltage change of an input line network. The embodiment of the invention further provides a device with the lighting circuit. According to the stroboscopic-free LED lighting circuit and the device, the constant-current control module is controlled by the control unit to achieve the purpose of turning on or turning off the different LED lamp sets according to the voltage change of the input line network. Furthermore, the output power of LED lamps can be kept constant in different time periods by controlling the output current of the turned-on LED lamp sets, the luminous flux output can be kept constant, and the stroboscopic-free requirement can be met.

The invention discloses a generator which comprises an end cover, a generator part, a motor bracket and an induced air shell, wherein the generator part consists of a stator, a rotor, a rotor shaft and a generator cooling fan; the induced air shell is divided into two cavities by a middle clapboard, the front cavity is connected with the motor bracket and is provided with an air inlet in the side wall, and the rear cavity is provided with a fan which is coaxially connected with the rotor and is provided with an air outlet in the side wall; and one side, which is axially opposite to the middle clapboard, of the rear cavity is provided with an exhaust opening. A ventilation channel is arranged in the manner that for the first ventilation channel, cooling air is sucked into the front cavity of the induced air shell from the air inlet in the side wall of the front cavity of the induced air shell, cools the generator and then is exhausted by the generator cooling fan through the air outlet of the generator; and for the second ventilation channel, air is sucked from the exhaust opening in the cavity from the fan in the rear cavity of the induced air shell and is exhausted through the air outlet in the side wall of the cavity. The generator has the advantages of small noise, temperature rise and invariable output power.

The invention discloses an electro-magnetic doubly salient motor for realizing fault-tolerant control of an excitation converter through dynamic switching, and relates to the field of electro-magnetic doubly salient motors.When an open-circuit fault occurs in an excitation converter, the doubly salient electro-magnetic motor switches two switched-on switch tubes in normal power generation operation to the other two switched-on switch tubes for fault-tolerant power generation operation, and reduces the absolute value of the target current in the current direction of the excitation current to 0 and increases the absolute value of the target current in the opposite direction of the excitation current; on-off of an IGBT switch in the main power drive circuit is controlled to adjust the working state of each phase in the three-phase armature winding so as to control the output voltage to be stabilized at a target voltage value, it is guaranteed that the output power is basically unchanged in the excitation current switching process, and the power generation reliability of the electro-magnetic doubly salient motor in important occasions such as aerospace and automobiles is improved, and the motor is suitable for an electro-magnetic doubly salient motor in multi-quadrant operation.

The invention relates to a three-temperature-zone constant-power LED (light-emitting diode) driving integrated circuit. A constant-current driving circuit adjusts power for driving an LED bead according to a current, a near-zero-temperature-excursion reference voltage and a negative-temperature reference voltage when the LED bead works, so that the power applied by the constant-current driving circuit onto the LED bead is adaptive to the working temperature of the LED bead; and when the working temperature of the LED bead is close to a limit junction temperature of the LED bead, a junction temperature protection circuit switches off the driving of the constant-current driving circuit for the LED bead. When the temperature is lowered to the temperature that the LED bead does not have the light attenuation, the output power is basically unchanged; in the light attenuation temperature range of the LED bead, the LED bead works in a power reduction manner; and the LED bead or the driving circuit is switched off when the temperature reaches the limit junction temperature, so that the reliability at the high voltage or high-voltage instantaneous impact can be ensured.

The invention discloses a series mode combustion efficiency control method for a hybrid electric vehicle and a storage medium. When the whole vehicle is in a high-temperature series control mode, thetarget output power is kept unchanged, and the engine speed is increased and the engine output torque is reduced, so that the combustion efficiency reaches the optimal combustion efficiency under thecurrent working condition. The knocking phenomenon of the engine is eliminated by increasing the rotating speed of the engine and reducing the output torque of the engine, so that the combustion efficiency of the engine reaches the optimal combustion efficiency under the current working condition, the output power is kept unchanged, the knocking phenomenon of the engine is eliminated, and deterioration of fuel economy is avoided.

The invention discloses an electric heating control circuit for an air resistance furnace. The electric heating control circuit is composed of four stage heating control circuits, a main switch and a main control circuit. In the four stage heating control circuits, a first stage heating control circuit is used for controlling an air preheating section of the air resistance furnace, and a controlled electric heating element is arranged at the front end of the air resistance furnace and close to an air inlet; an electric heating element controlled by a fourth stage heating control circuit is arranged at the position close to an air outlet; and electric heating elements controlled by second and third stage heating control circuits are arranged between the first stage heating control circuit and the fourth stage heating control circuit. An external alternating current power supply is accessed through the main switch, and the four stage heating control circuits are arranged at the lower end of the main switch; and the four stage heating control circuits are connected with the main control circuit which sends drive signals and temperature setting signals to control the four stage heating control circuits.

The invention relates to the technical field of loader-diggers, in particular to a hydraulic system of a loader-digger, a control method of the hydraulic system of the loader-digger and the loader-digger. The hydraulic system of the loader-digger comprises an engine, a hydraulic pump, a loading end main valve and a digging end main valve; the engine is connected with the loading end main valve andthe digging end main valve through the hydraulic pump, and the output power of the engine and the output torque of the hydraulic pump can be adjusted so that the output power of the hydraulic pump can be matched with the output power of the engine. According to the hydraulic system, the control method and the loader-digger, when a digging device works, the rotating speed of the engine is reducedto reduce the output power of the engine, and the output torque of the hydraulic pump is increased to keep the output power of the hydraulic pump unchanged, so that the output power of the hydraulic pump is matched with the output power of the engine, the power utilization rate of the engine is increased, and the oil consumption and noise of the engine are remarkably reduced; and when a loading device works, the rotating speed of the engine is increased to enable the engine to perform full-power output, and the output torque of the hydraulic pump is reduced, so that the output power of the reactance plunger pump is kept unchanged.

The invention discloses an exhaust gas heating system of an internal combustion engine, and belongs to the technical field of internal combustion engines. The exhaust gas heating system is characterized in that a control valve is additionally arranged on an exhaust gas pipeline added to a first set of air cylinders, when the engine is in cold starting and operates under medium and low loads, the exhaust gas temperature needs to be increased, only exhaust gas of a second set of air cylinders flows out and is input into an exhaust gas aftertreatment device, the first set of air cylinders achievecylinder closing, no exhaust gas flows out of the first set of air cylinders, meanwhile, an air inlet valve is adjusted, the gas inlet amount entering the two sets of air cylinders is reduced, fuel feeding to the first set of air cylinders is stopped, and the second set of air cylinders keep the output power of the engine unchanged by increasing the oil injection amount. The exhaust gas temperature can be increased so that the exhaust gas aftertreatment device can still reach the temperature required by efficient operation of the exhaust gas aftertreatment device, harmful substances containedin the exhaust gas can be fully converted or treated under the temperature condition, the exhaust gas flow is reduced, namely airflow speed is reduced, and the aftertreatment conversion efficiency isfavorably improved.

The invention provides a control system for the constant current output of a gas water heater fan. The control system comprises a current setting module, a fan running driving module, a current feedback reading module, a current comparing module and a current regulating module, wherein the current setting module determines the current setting value of the fan; the fan running driving module transmits the current setting value to the fan; the current feedback reading module reads the current output value of the fan at the moment; the current comparing module compares the read current output value with the current setting value and determines a current difference; and the current regulating module converts the current difference into a PWM value and transmits the PWM value to the current setting module. Actual output current is consistent with set current, and the output power of the fan is kept unvaried, so that actual air output quantity also can be kept in a set range when the external environment changes, and the combustion effect cannot be affected by the external environment factor.

The invention belongs to the field of vehicle lamplight, and discloses an LED illumination module, a rated output current setting method of an LED driving power supply, a vehicle lamp and a vehicle. The LED illumination module comprises an LED light source and the LED driving power supply, the LED driving power supply supplies power to the LED light source, and the LED light source has a first environment temperature T1 when working stably and has a second environment temperature T2 in other working states, and T1 is larger than T2. The LED driving power supply outputs a first driving voltage V0' to the LED light source at the first environment temperature T1 and obtains a corresponding first driving current I0 ' from the V0', and the first driving current I0 ' is set as a rated output current of the LED driving power supply. According to the invention, the output power of an LED in a stable working state at the higher environment temperature is improved, namely the output power of the LED light source can be basically kept unchanged in a full temperature range, so that the illumination performance of the LED light source can be fully exerted, and a stable illumination effect can be maintained.

The invention discloses a wireless charging derating control method, device and system for preventing repeated adjustment of output current, and the method comprises the following steps: connecting a transmitting end circuit, enabling a transmitting end to enter a working state, and detecting the working state of a receiving end circuit; monitoring an input voltage value of the Buck module; judging whether the input voltage value of the Buck module repeatedly circulates between a first voltage threshold V1 and a second voltage threshold V2 or not; when the input voltage value of the Buck module repeatedly circulates between the first voltage threshold V1 and the second voltage threshold V2, controlling the output current of the BUCK module to be stabilized at the derated current I3. The output power of the Buck module to the load battery is kept unchanged, stable charging of the load battery is achieved, and damage to the load battery is reduced.

The invention discloses a method and system for controlling power of a wind turbine generator under the strong wind condition, and belongs to the field of wind power generation. Whether the rotating speed set value and the torque set value of a generator need to be adjusted or not is judged by detecting an anemograph, the newest rotating speed reducing and torque increasing set values of the generator are calculated, the requirement for reducing the unit limit load under the strong wind condition is considered to the maximum degree, and meanwhile it is guaranteed that the output power of the unit is kept unchanged, and no generating capacity loss exists. The torque set point increasing value is obtained through calculation. The rotating speed reducing and torque increasing mode of the generator is adopted as a power control mode under the strong wind condition, and therefore the limit load of large components under the strong wind condition is reduced, meanwhile, the output power of the generator is kept unchanged, and the problems that in a traditional mode, only the rotating speed of the generator is reduced, the torque of the generator is unchanged, consequently, the output power of the unit is reduced, and the generating capacity loss is caused under the condition of frequent strong wind are solved.