6results about How to "Reduce selection cost" patented technology

The invention relates to the technical field of electric driving systems, and discloses an electric driving system with a hydraulic torque converter and a forklift. The system comprises a driving motor, a hydraulic torque converter, a speed reducer and a vehicle control unit, wherein a lock-up clutch is integrated in the hydraulic torque converter; an output shaft of the driving motor is connected with a pump wheel input side of the hydraulic torque converter; a turbine output side of the hydraulic torque converter is connected with an input shaft of the speed reducer; the output end of the reducer is connected with a vehicle drive axle; when the vehicle is in the low-speed large-torque demand working condition, the lock-up clutch is controlled to be separated, so that the hydraulic torque converter works in the torque conversion working condition, and when the vehicle is in the low-speed large-torque demand working condition, the lock-up clutch is controlled to be separated; and when the vehicle is in a high-speed small-torque demand working condition, the lock-up clutch is controlled to be engaged, so that the pump wheel of the hydraulic torque converter is mechanically locked with the turbine, and the vehicle is in a coupler working condition. The power performance and the energy efficiency of the vehicle are improved, the cost of the electric drive system is reduced, and the economical efficiency and the NVH performance are improved.

The invention provides an operating mechanism and a load switch, and relates to the technical field of load switches. In the operating mechanism, a main shaft is used for executing switching-on and switching-off through an executing mechanism; the main shaft is provided with a shifting block protruding in the radial direction. The transmission assembly is in transmission connection with the driving device. The clutch structure comprises a clutch piece, a pusher dog and an elastic piece; the pusher dog is rotatably connected to the transmission assembly; the pusher dog is provided with a first end and a second end which are opposite; the pusher dog rotates to the first end along with the transmission assembly to abut against the shifting block so as to drive the spindle to rotate; the elastic piece is connected with the pusher dog and used for providing elastic force for the pusher dog when the first end is away from the main shaft. The clutch piece is used for being fixed to the bearing body and abutting against the second end, so that the pusher dog rotates relative to the transmission assembly to the first end and is lifted up to cross the shifting block. The load switch provided by the invention adopts the operating mechanism. According to the operating mechanism and the load switch provided by the invention, the technical problem that electric control operation is easy to lose efficacy due to manual operation can be improved.

The invention discloses a single-stage AC-DC converter control method, system, device and equipment and a storage medium, and belongs to the field of electric energy conversion, and the method comprises the steps: simplifying a duty ratio expression according to a whole power factor control strategy, and obtaining a simplified conduction duty ratio; determining a Taylor expansion point according to the simplified conduction duty ratio to obtain theoretical conduction time; timing is started from the switch conduction moment of the current switching period until demagnetization is detected to be finished, counting is carried out, a predicted value of the next switching period is obtained, and a conduction time predicted value of the next switching period is determined based on the theoretical conduction time; and determining the conduction time correction based on output voltage closed-loop control, and superposing the conduction time predicted value of the next switching period and the conduction time correction to obtain the final switching conduction time so as to realize control of the single-stage AC / DC converter. According to the invention, the equivalent switching frequency can be improved, the power density of switching power supply products is improved, the device stress is reduced, and the model selection cost is reduced.

The invention belongs to the technical field of chemical preparation, and particularly relates to a device and method for preparing deuterium and a preparation method of an iron-nickel bimetallic catalyst. According to the method for preparing the deuterium, the KOD / MeOD solution is used as the anode electrolyte, the proton exchange membrane, the electrolytic tank and the catalyst are used for directly electrolyzing the deuterated methanol to produce the deuterated formic acid, the deuterated methanol can be directly oxidized into the deuterated formic acid in the mixed solution of the anode electrolytic tank, deuterium gas is separated out on the cathode side, and the deuterated methanol can be directly oxidized into the deuterated formic acid. Selective oxidation of low-carbon molecules is realized to decouple and electrolyze heavy water to prepare deuterium; the deuterium preparation device is designed according to the deuterium preparation method and comprises a power supply, an anode, a cathode, an anode electrolytic tank, a cathode electrolytic tank, a proton exchange membrane and a constant-temperature shell, an iron-nickel bimetallic catalyst NiFe2O4 / NF is selected as the catalyst, the embodiment of the invention provides a preparation method of the catalyst, and the iron-nickel bimetallic catalyst NiFe2O4 / NF has the advantages of high performance and stability.

The invention discloses a mirror image high-gain Boost converter with switch tubes synchronously switched on and switched off, and belongs to the technical field of power electronic direct current conversion. The converter comprises a direct-current voltage source, two inductors, seven capacitors, seven diodes and two MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switching tubes. The core innovation lies in that the two switching tubes are completely and synchronously switched on and switched off, no dead time needs to be set, and the control logic is simplified. Through specific connection and multiplexing of a capacitor and an inductor, an efficient voltage-multiplying unit is formed, extremely high voltage gain is achieved, the gain formula is shown in the specification, and D is the duty ratio of a switching tube. According to the structure, high gain is obtained, meanwhile, the voltage stress of the switching tube is remarkably reduced, the value of the voltage stress is only output voltage, and the switching loss is effectively reduced. The device has the advantages of being small in number of devices, compact in structure, high in efficiency, low in cost and the like, and is particularly suitable for occasions where low input voltage needs to be boosted to high direct current bus voltage in the new energy field of photovoltaic systems, energy storage systems and the like.

The invention provides a motor controller, a power system and a vehicle, and relates to the technical field of motors, the motor controller comprises a direct current bus capacitor unit, the direct current bus capacitor unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor and the second capacitor are adjacent, and at least parts of the first capacitor and the second capacitor are oppositely arranged; the first connecting bar assembly is used for connecting the first capacitor and the second capacitor in series; and the power unit is electrically connected with the first connecting bar assembly. According to the motor controller, the internal stray inductance of the motor controller can be reduced, the working efficiency of the system is improved, and the model selection cost of the bus capacitor and the power module is reduced.