36results about How to "Accurate speed adjustment" patented technology

The invention discloses a speed regulation control method of air conditioner outdoor fan. The method uses the temperature of conditioner outdoor coil pipe to reflect the system pressure. The RPM regulation and control strategy of the outdoor fan is designed base on the combinational factors of changes of the outdoor environmental temperature and the outdoor coil pipe temperature. Through the control of outdoor fan RPM the outdoor coil pipe temperature can be regulated. Through controlling the outdoor coil pipe temperature within the set range of temperature the system pressure can be stabilized within the scope of the reliable operation of the compressor, therefore the safe operation of the compressor can be guaranteed. Because the precise regulation of the PRM of the outdoor fan can be achieved without the unnecessary pressure sensor installation in the air conditioner system for collecting the system pressure, so the accruement of hardware cost of the product can be avoided. At the same time the stepless speed regulation is used in the outdoor fan to enhance the stability of the system pressure control, and improve the air conditioning system work performance. The method is especially useful for the base station air conditioner to enhance the system operation reliability of the base station air conditioner.

The invention relates to a multifunctional rotary tillage, fertilization and seeding machine, in particular to a multifunctional rotary tillage, fertilization and seeding machine suitable for seeding of rice, wheat and oilseed rape, which belongs to the technical field of agriculture and forestry machines. The multifunctional rotary tillage, fertilization and seeding machine comprises a rack; a rotary tillage ditching mechanism and an auxiliary ditching mechanism are arranged on the front part of the rack, a seeding and fertilization mechanism is arranged in the middle part of the rack, and a pressing and covering mechanism is arranged on the rear part of the rack; one side of the rack is provided with a first speed changer connected with an external power output end, and the other side of the rack is provided with land wheels; the seeding and fertilization mechanism comprises a fertilizer unit and a seeder unit, a power output end of the first speed changer is connected with a power input end of the rotary tillage ditching mechanism, and the land wheels are connected with power input ends of the fertilizer unit and the seeder unit through transmission chains, respectively. The multifunctional rotary tillage, fertilization and seeding machine has the functions of simultaneously performing rotary tillage, fertilization and seedling in one operation.

Passage barrier (10) having two barrier elements (24, 26) and two shafts (16, 20) which are aligned with one another, are separate from one another and are able to be driven by separate motors (14, 22), wherein one barrier element (24, 26) is held fixedly on each shaft (16, 20) and can be pivoted independently of the other barrier element (26, 24) by driving the corresponding shaft (16, 20).

The invention provides a fan speed control method, a fan speed control device and a projection system cooling method. The method comprises the following steps: acquiring the air temperature of the air inlet and the air temperature of the air outlet of electronic equipment in an nth time period and the total amount of heat generated by the electronic equipment in the nth time period, wherein n is an integer greater than or equal to 1; and determining the speed of a fan at the air inlet and the speed of a fan at the air outlet in an (n+1)th time period adjacent to the nth time period according to the total amount of heat generated by the electronic equipment in the nth time period, the air temperature of the air inlet and the air temperature of the air outlet. According to the fan speed control method, the fan speed control device and the projection system cooling method provided by the embodiments of the invention, through control on accumulation of heat in the electronic equipment, the speed of the fans can be adjusted before temperature rise, and the electronic equipment can be cooled in a timely manner.

The invention belongs to the field of aero-engine disc-shaft connection rotor system thermal effect analysis and thermal deformation measurement, and relates to a disc-shaft connection rotor system thermal analysis test bench and a thermal deformation measurement method. The test bench is mainly composed of an electric drive and control system, an ignition system, a heat insulation system, a nonlinear support-rotor system, a test sensing system and a base. The heating temperature of a disc-shaft connection rotor system can be accurately controlled by an igniter. By adjusting the gas valve of the igniter, the firepower of the igniter can be controlled, and the disc-shaft connection rotor system can be heated within different temperature ranges. The thermal deformation of a disc-shaft connection rotor system in an environment with uniform temperature distribution can be measured, and the thermal deformation in an environment with non-uniform temperature distribution and the thermal deformation under a variable speed condition can be measured.

The invention discloses a single bracket electromobile motor stator and a manufacturing method, and belongs to the technical field of motor stator manufacturing. The motor stator comprises a stator core (1) and a bracket body (2), wherein the bracket body (2) comprises a core mounting part (201), a supporting part (202) and a shaft sleeve (203); one end of the core mounting part (201) is connectedwith the supporting part (202); a flange (204) is arranged at the other end of the core mounting part (201); the shaft sleeve (203) is arranged in the center of the supporting part (202); and insulating sheets (3) are arranged on the two sides of the stator core (1). The manufacturing method comprises the steps of spinning, material cutting, notching, winding, riveting, reshaping, press mountingand fixing. According to the motor stator and the manufacturing method, the quality of a stator sheet can be improved; the efficiency of a motor can be high; the motor can operate stably; the performance of the motor can be good; and the production efficiency can be improved.

The invention provides a fan rotating speed control method and device and a heat dissipating method of a projection system. The method comprises the steps of obtaining a fan rotating speed, a heating total quantity and a heat dissipating total quantity in the nth time period and an air outlet air temperature in the n+1th time period; determining a predicted fan rotating speed in the n+1th time period according to the heating total quantity and the heat dissipating total quantity in the nth time period and the air outlet air temperature in the n+1th time period; and determining the fan rotating speed in the n+1th time period according to the fan rotating speed in the nth time period and the predicted fan rotating speed and a preset rotating speed adjusting threshold in the n+1th time period. The fan rotating speed control method and device and the projection system can be used for adjusting the fan rotating speed before the temperature rises through controlling the heat accumulation in electronic equipment.

The invention discloses an integrated testing device under a multi-field coupling environment, which comprises a mechanical behavior experiment system and a corrosion behavior experiment system mutually switched to realize the testing of mechanical and corrosion behaviors of a material under the multi-field coupling environment and monitor the expected performance of the material under a multi-factor collaborative interaction condition. The experimental device is simple in structure, low in cost and convenient to operate, controllable adjustment of the loading direction, the load size, the loading rate, the flow field direction, the flow field flow speed, the flow field environment temperature and the corrosive medium can be achieved, real-time, in-situ and dynamic monitoring can be conducted on materials from the aspects of mechanics, corrosion behaviors and the like, the device is suitable for samples of different materials and different sizes in different service environments, and provides technical support for scientifically and reasonably evaluating mechanical and corrosion performance evolution of materials in a simulated service environment.

The present invention discloses a submersible mixer experimental device which comprises a submersible mixer (1) and a support column (2). The tail of the submersible mixer (1) is fixed at the middle of the support column (2). The submersible mixer experimental device also comprises a first pull force sensor (4) for measuring thrust and a second pull force sensor (5) for measuring a torque. One end of the first pull force sensor (4) is fixedly connected to the upper end of the support column (2) through a steel wire rope, and the other end of the first pull force sensor (4) is connected to a first fixed point (6) through a steel wire rope. One end of the second pull force sensor (5) is fixedly connected to the upper end of the support column (2) through a steel wire rope, and the other end of the second pull force sensor (5) is connected to a second fixed point (7) through a steel wire rope. The experimental device of the invention can measure the thrust and torque of a submersible mixer at the same time, and the measurement precision is high.

The embodiment of the invention discloses a variable-frequency speed regulation control system with a load observer and a frequency converter. The variable-frequency speed regulation control system iscomposed of a rotating speed and current double-closed-loop system, the variable-frequency speed regulation control system further comprises the load observer, and the load observer comprises an adjuster and an integrator; the input end of the regulator inputs the difference between an actual rotating speed value and a rotating speed observation value, and the first output end of the regulator iselectrically connected with the output end of the rotating speed regulation module and outputs a first load torque observation value; the integrator is used for calculating a rotating speed observation value according to a second load torque observation value and the output torque of the system and outputting the rotating speed observation value to the input end of the regulator from the output end. According to the technical scheme provided by the embodiment of the invention, the change condition of the load is detected in real time through the load observer, when the load changes, the loadstate can be quickly responded, the rotating speed of the motor can be accurately adjusted, the dynamic reduction of the rotating speed of the motor can be reduced to the greatest extent in combination with vector control, and the stability of the system is favorably maintained.

The invention relates to a device for spraying contamination onto the surface of an insulator uniformly. The device comprises a rack, a stepping motor (8), a driving wheel (2), a driven wheel (16), a loading plate (6) and a contamination sprayer (15). The stepping motor (8) is fixed to the rack. The driving wheel (2) is arranged on the output shaft of the stepping motor (8). The driving wheel (2) is in transmission connection with the driven wheel (16) through a belt. A shaft body (14) is disposed on the axis of the driven wheel (16) and is rotatably connected with the rack. The loading plate (6) is arranged on the shaft body (14) for fixing the insulator (7). The contamination sprayer (15) sprays the surface of the insulator (7) with contamination during the rotation of the insulator (7). Compared with the prior art, the device has advantages of small friction, strong bearing capacity, safe and stable running, precise and controllable rotation speed, simple operation, convenient disassembly and transportation and the like.

The invention relates to the field of an anesthesia machine, in particular to a self-inspection circuit of a brushless DC motor of the anesthesia machine. The self-inspection circuit comprises a master control central processing unit (CPU), a field programmable gate array, a three-phase full-bridge driving circuit and a signal conditioning circuit, wherein the master control CPU is connected with the field programmable gate array; the three-phase full-bridge driving circuit is connected with the master control CPU and the field programmable gate array respectively; when the brushless DC motor is in self inspection, the master control CPU simulates driving signals of the three-phase full-bridge driving circuit in various rotation speed conditions, and the three-phase full-bridge driving circuit can work in various working frequencies by means of the capability of processing pin signals at a high speed by the field programmable gate array; the three-phase full-bridge driving circuit is directly connected with the brushless DC motor; and the field programmable gate array is connected with the brushless DC motor via the signal conditioning circuit and used for detecting a self-inspection signal of the brushless DC motor and sending a self-inspection result to the master control CPU, and therefore, the rotational speed of the brushless DC motor can be accurately regulated.

The invention provides an external fan control method and device and an air conditioner, and relates to the technical field of air conditioners. The external fan control method comprises the steps of obtaining the exhaust pressure of the air conditioner in real time; under the condition that the exhaust pressure falls into a first preset pressure interval, calculating a first theoretical adjusting quantity according to the exhaust pressure; adjusting the rotating speed of an external fan of the air conditioner according to the first theoretical adjusting quantity; under the condition that the exhaust pressure falls into a second preset pressure interval, obtaining a heat exchange temperature difference of an outdoor heat exchanger, wherein an upper limit value of the second preset pressure interval is equal to a lower limit value of the first preset pressure interval; calculating a second theoretical adjusting quantity according to the heat exchange temperature difference; and adjusting the rotating speed of the external fan according to the second theoretical adjusting quantity. According to the external fan control method provided by the invention, on the premise that the exhaust pressure requirement is met, the rotating speed of the external fan can be accurately adjusted, and energy waste is avoided.

The invention belongs to the technical field of sensor system detection of railway vehicles, and particularly relates to a railway vehicle speed simulation experiment device and a working condition simulation method, and the device comprises a power supply, a quasi-speed rotating wheel, a quasi-speed motor and a drive circuit. The quasi-speed rotating wheel is driven by the quasi-speed motor, and the speed is detected by a speed sensor on the railway vehicle; the power supply is electrically connected with the quasi-speed motor through the driving circuit; the driving circuit comprises a speed regulation knob and a change-over switch; the change-over switch is used for switching the rotation direction of the pseudo-speed motor; and the speed adjusting knob is used for adjusting the rotating speed of the quasi-speed motor. Different vehicle speeds and different advancing directions of the rail vehicle in the advancing process can be simulated, so that the safety and reliability of circuits such as a corresponding sensor system and a feedback control system including a brake system or an alarm system in the rail vehicle can be tested.