57results about How to "Avoid mechanical loss" patented technology

The invention belongs to the control technical field of a brushless direct current motor, and provides a braking method for maintaining non-fluctuation of electromagnetic torque communication and controllable magnitude of braking torque; the torque control performance of the motor under a braking state can be improved; and in the process, fluctuation of communication torque does not exist, and the control performance is not affected by the rotary speed of the motor. According to the technical scheme provided by the invention, the stable electromagnetic braking method applicable to the brushless direct current motor comprises two steps of modulation strategy switching and commutation current control, wherein the step of modulation strategy switching is carried out by performing reasonable partitioning on the rotary speed of the motor according to specific motor parameters and requirements of a designer; the rotary speed of the motor is partitioned into a high-speed region and a low-speed region; feedback braking which refers to a modulation strategy 1 is adopted in the high-speed region while plug braking which refers to a modulation strategy 2 is adopted in the low-speed region; the step of commutation current control is carried out by designing a commutation duty ratio compensation controller; the commutation duty ratio compensation controller is matched with a main controller to form a current controller; and finally, a proper commutation duty ratio is calculated. The stable electromagnetic braking method and apparatus are mainly applied to the design and manufacturing occasions of the brushless direct current motor.

The invention discloses an auto-induction conveying device. The auto-induction conveying device comprises a transmission belt, supporting plates, rotating shafts, sliding wheel disks, a device body, a driving device, a starting button, a circuit box, a gravity sensor, a center processing box, a signal transmission box, an adjusting controller, a driving shaft, a driving rotation wheel, a driving motor and a fixed base. The transmission belt is connected with the supporting plates. The driving device is installed below the supporting plates. The starting button is fixed to the left side position of the driving device. The signal transmission box is located below the gravity sensor. The driving rotation wheel is located at the left side position of the driving motor. The fixed base is connected with the device body. According to the auto-induction conveying device, an alloy material is used and matched with a supporting plate device and roller equipment, working efficiency is greatly improved, the efficiency is improved obviously, and the speed is increased; and the gravity sensor and signal transmission equipment are arranged, the auto-induction speed is high, electric energy losses are reduced, and time is shortened.

The invention discloses a mechanically coupled flywheel assisted composite energy storage system and a control method thereof. The system comprises a flywheel module and a compressed air energy storage module. The flywheel module is connected to a rotating disc through a continuously variable transmission when a clutch is closed, and the rotating disc achieves pre-synchronization with the flywheelspeed by motor acceleration. The rotating disc is connected to a reciprocating compressor, the reciprocating compressor is connected to the compressed air energy storage module, and the compressed air energy storage module compensates an intermittent power supply by connecting a generator. The flywheel energy storage and the compressed air energy storage adopt a mechanically coupled parallel structure. By collecting the flywheel speed, the clutch switch and the compressed air energy storage working state are determined, and the control strategy is simple and easy to operate and achieve.

The invention discloses an electrode for electric arc furnace steelmaking and a spraying method thereof, which belong to the technical field of metallurgical production equipment accessory maintenanceand repair processes and have the advantages that the service life is longer, and the efficiency of being oxidized during a use process is reduced obviously. The electrode comprises a graphite electrode body and a high-temperature protection layer, wherein the high-temperature protection layer coats the surface of the graphite electrode body. The spraying method uses compressed air as power to online spray pulpy fire-resistant material on the graphite electrode body to acquire the electrode.

The invention relates to a pure electric vehicle single-axle double-motor drive system. The pure electric vehicle single-axle double-motor drive system is characterized in that two motors are coaxially arranged through respective clutches, and a shaft is located between a front axle and a rear axle of the vehicle; on the shaft, two motors are dynamically coupled via respective gear set and drive the rear axle of the vehicle via another gear set and a differential; the two motors are connected with a battery pack through a high-voltage distribution cabinet; the two motors are controlled to workindividually or together according to different vehicle load requirements. The pure electric vehicle single-axle double-motor drive system realizes the switching between different working modes, so that the two motors work in the respective high-efficiency areas, thus effectively improving the efficiency and economy of the drive system.

The invention discloses a double-stator driven power unit integrated spiral mixed-flow type water jet propulsion pump. The invention relates to the technical field of water jet propulsion, a magneticsuspension bearing is composed of a first magnet and a second magnet, the first magnet is embedded and fixed on the inner wall of a shell at two ends of a winding coil, the second magnet is fixed at two ends of a permanent magnet, and the first magnet and the second magnet at the same end are arranged in a homopolar repulsion manner; wherein one end of the shell is a water body inlet, a rectification spray pipe is integrally formed at the other end, a plurality of guide vane blades are integrally formed on the inner wall of the rectification spray pipe, a guide device is arranged in the rectification spray pipe, and a water body outlet is formed at the other end of the rectification spray pipe; and a fixed bracket is arranged in the shell in the water body inlet. And the electric energy conversion rate is high, the propulsion efficiency and the damage pipe redundancy of the submarine are improved, the space in the naval vessel is effectively saved, and the radiation noise is effectively shielded and reduced.

The invention discloses a plasma height adjusting apparatus and method. The apparatus comprises an MPT(microwave plasma torch) module, an optical fiber probe, an optical system, a camera, a detectionterminal, a control panel and an exhaust module, wherein the MPT module is a plasma torch tube; the exhaust module is used for exhausting a chamber of the plasma torch tube; the optical fiber probe isused for acquiring an optical signal generated by plasma; the optical system is connected with the optical fiber probe and used for generating a spectrogram according to the optical signal transferred from the optical fiber probe; the camera is used for photographing a plasma image; and the detection terminal is used for controlling an exhaust velocity of the exhaust module by virtue of the control panel, calculating a signal-to-background ratio according to the spectrogram generated by the optical system and identifying the plasma image photographed by the camera so as to obtain a plasma height. According to the plasma height adjusting apparatus and method, the concentration of plasma gas is changed by virtue of exhaustion, and then the plasma height is further indirectly changed, so that an actual imaging point is disposed in an optimum observation interval of plasma, thereby improving the detection precision.

The invention discloses a high-efficiency automatic controlled heating water heater. The high-efficiency automatic controlled heating water heater comprises a cold water inlet, a machine case, an inner container, a water storage box, a heating rod, a dry-heating-resistant device, a hot water outlet, a water-break detection ball, a water inlet valve controller, a temperature indicator, a temperature receptor, a control panel, a regulation control cabinet, a binding post, a heating processor and a circuit box. The cold water inlet is connected with the machine case. The water-break detection ball is located below the cold water inlet. The heating rod is connected with the dry-heating-resistant device. The temperature indicator is connected with the control panel. The regulation control cabinet is located below the control panel. The binding post is connected with the machine case. The circuit box is fixed to the position below the regulation control cabinet. The high-efficiency automatic controlled heating water heater is provided with the temperature receptor, and control over the water temperature is better. The water heater is provided with an anode magnesium-aluminum rod descaling device, and power consumption is low. The water heater is made of an aluminum alloy material, the practicality is more prominent. Time is saved. The cost is lowered. The purposes of time saving and trouble saving are achieved.

The invention discloses a convenient polishing machine for machining bearings. The convenient polishing machine comprises a driving motor, a polishing wheel, a rotating shaft, a machine head device, a machine body, a lifting frame, a workbench, a circuit box, a driving rotating wheel, a driving shaft, an adjuster, a transmission belt, a protective cover, a controller, a control panel and a fixed base. The driving motor is connected with the driving rotating wheel. The driving shaft is fixed to the right side of the driving rotating wheel. The transmission belt is located on the inner side of the protective cover. The rotating shaft is fixed to the left side of the transmission belt. The control panel is located on the outer side of the machine body. The fixed base is connected with the machine body. The polishing wheel of the convenient polishing machine for machining the bearings is made of good materials and has high abrasion resistance. The lifting equipment is arranged, so that the situation that the polishing direction is single during working is well avoided. The size of the convenient polishing machine is small, and the high-quality polishing equipment is arranged, so that the polishing efficiency is greatly improved, the polishing speed is increased, and the production development speed is increased.

The invention relates to the field of motors, and discloses a brushless direct-current variable frequency motor and a control system using the brushless direct-current variable frequency motor. The brushless direct-current variable frequency motor comprises a stator of an exciting winding and a rotor, and a trapezoid groove is formed in the inner surface of the rotor; a plurality of RbFeB magnets of the same nature are arranged inside the trapezoid groove; an iron core with an omega-shaped groove is arranged on the outer surface of the stator. The brushless direct-current variable frequency motor has the advantages of being large in power and saving energy. The control system using the brushless direct-current variable frequency motor comprises a microprocessor, a motor frequency converter, a display controller, an electronic differential, a vehicle speed setting and memory module, an electric vacuum pump braking power-assisting control system, an electric oil pump steering wheel power-assisting control system and a battery charger. When the control system using the brushless direct-current variable frequency motor is used by a motor vehicle, power is large, energy is saved, and environment is protected.

The invention relates to a sensor type door lamp control switch which is characterized by comprising a sensor and a trigger magnet. The sensor and the trigger magnet are respectively arranged on two relatively moving members; a sensor circuit is arranged in the sensor and comprises a normally open reed switch used as a sensing element, a bidirectional thyristor for controlling the ON and OFF of a lighting circuit, and a capacitance-type resistor; the normally open reed switch is connected between a T1 pole and a gate pole of the bidirectional thyristor; the members are a box body and a box door; the sensor is fixed to the open periphery of the box body; and the trigger magnet for controlling the ON and OFF of the normally open reed switch is arranged at the corresponding position on the inner side of the box door. The reed switch and the capacitance-type resistor form a control loop, when the trigger magnet approaches to the sensor, the normally open reed switch is closed, the bidirectional thyristor is switch off due to no trigger signals coming from the gate pole, the lighting circuit is off, and thus, the non-contact type control of the door lamp is completed, the mechanical wear of a switch key is reduced, and the service life of the control switch is prolonged.

Provided is a catalyst packing device disposed at a bubble tower-type slurry bed reactor for FT synthesis. The packing device comprises, disposed adjacent to the reactor, a slurry preparation cell for preparing a slurry S from an FT synthesis catalyst and a slurry preparation oil, a top communicating pipe for guiding slurry from the reactor to the slurry preparation cell and a bottom communicating pipe for guiding slurry from the slurry preparation cell to the reactor, and an equalizing pipe for communication between the inside of the reactor and the inside of the slurry preparation cell. The top communicating pipe is inclined down from the reactor toward the slurry preparation cell and the bottom communicating pipe is inclined up from the reactor toward the slurry preparation cell. Inert gas introduction means for introducing inert gas are disposed at the slurry preparation cell.

The invention discloses a landing gear for a plant protection unmanned aerial vehicle with a buffering function. The landing gear for the plant protection unmanned aerial vehicle with the buffering function comprises a landing gear body. A main rod is arranged on the landing gear body. A bottom supporting rod is arranged on the landing gear body. A connecting rod is arranged between the main rod and the bottom supporting rod. An installation frame is arranged on the outer wall of a connecting sleeve, and a buffering mechanism is arranged on the landing gear body. A buffering sleeve is arrangedon the buffering mechanism, a buffering supporting rod is arranged in the buffering sleeve, a polygonal connecting tenon is arranged at the bottom of the buffering supporting rod, a rubber connectingseat is arranged in the buffering sleeve, an elastic piece is arranged in the buffering sleeve, and a sliding groove is formed in the inner wall of the buffering sleeve. A sliding block is arranged in the sliding groove, and a reset spring is arranged at the end of the sliding block. The landing gear for the plant protection unmanned aerial vehicle with the buffering function has simple structure, a large number of mechanical losses in the use process is can effectively avoided by a buffer structure, the service life of the landing gear body is prolonged, and the landing gear body is protected by the buffer structure, so that the damage of the landing gear body is avoided, the use is convenient, and the practicability is high.