31results about How to "Realize linear control" patented technology

The invention discloses a constant direct-axis current control method and system of an embedded permanent magnet synchronous motor, and belongs to the technical field of motors. According to the constant direct-axis current control method and system disclosed by the invention, a coordinate original point O and an intersection point A of a limited current circle and a quadrature-axis current form constant direct-axis current control of a constant torque output region, an intersection point of a straight line perpendicular to a direct-axis current and extending from a center C of a voltage limited oval of a control region of the embedded permanent magnet synchronous motor and a center point B of the voltage limited oval form constant direct-axis current control of a constant power output region, a phase current, a phase voltage and a rotational speed of the embedded permanent magnet synchronous motor are detected according to a target rotational speed of the embedded permanent magnet synchronous motor, and the embedded permanent magnet synchronous motor is driven to work by utilization of the constant and invariable direct-axis current and an inverse relation between the quadrature-axis current and the rotational speed of the motor. The constant direct-axis current control method and system have the characteristics of fast response speed, high reliability and no speed limit control, and have good application prospects in the fields of new energy automobiles and the like.

The invention relates to a tobacco breeding program controlling and dishing seeder, which consists of a conveying belt (1), a track substrate, a substrate (2), a throwing wheel (3), a hole pressure plate (4), a cylinder (5), a seed dish (6), a seed conveying conduit (7), a glass protective cover (8), a substrate quantification plate (9), a hole pressure laser sensor (10), a seeding guide laser sensor (11) and a water spraying and cracking regulating valve (12); and the process consists of five parts of a substrate loading part, a hole pressure part, a seeding part, a cracking part and a substrate restoring part. Five operations of the substrate loading, the hole pressure, the seeding, the coating cracking and the seed covering of the controlling seeder are integrated into a whole; the substrate loading quantity of each hole of a seed dish in the whole breeding process can realize linear control and can save more than 40 percent of coated seeds; the seeding precision is between 98 and 99 percent; and the cracking precision of the coated seeds can reach 100 percent.

The invention discloses a lifting bed special for a hyperbaric oxygen chamber, and the lifting bed is matched with an ordinary stretcher. The hyperbaric oxygen chamber lifting bed comprises a hyperbaric oxygen chamber treatment conveying car (which comprises a chassis and a lifting support) and a hyperbaric oxygen chamber treatment bed (which comprises multiple layers of panels and supporting portions arranged in parallel). A frame panel is arranged at the upper end of the lifting support, a hydraulic lifting device and a lifting track are arranged on the lifting support, a bed plate is also arranged on the frame panel, and the bed plate and the frame panel are hinged together through a bolt. Rolling beads are also arranged between the bed plate and the frame panel, a positioning pin is arranged at the lower portion of the bed plate, and a positioning hole is formed in the frame panel. The hyperbaric oxygen chamber lifting bed is simple and easy to manufacture, omits procedures such as transferring and interface connecting compared with the prior art, is safe and reliable, convenient to operate and low in cost, achieves linear control, completely meets technological requirements and safety requirements, and is low comprehensive cost, and convenient to use and operate. The lifting bed can be applied to hyperbaric oxygen chamber treatment, and lowers labor intensity of nursing staff.

The present invention provides a vehicle speed control method and system. The method includes: monitoring the vehicle speed and the opening of the accelerator pedal in real time, and obtaining the current speed of the vehicle, the first opening value of the accelerator pedal after the change of the opening of the accelerator pedal, and the value of the first opening of the accelerator pedal. Decrease the pedal opening value, and obtain the corresponding target vehicle speed according to the first opening value of the accelerator pedal; judge whether the driver has decelerated according to the current driving speed of the vehicle, the target vehicle speed, and the decreasing amplitude value of the accelerator pedal opening Intent; if the driver has the intention to decelerate, then obtain the driver's expected braking intensity through the vehicle's current driving speed and the target vehicle speed, and control and adjust the vehicle motor according to the expected braking intensity The power generation torque of the control vehicle decelerates. The invention balances the contradiction between the electric braking intensity and the driver's comfort, and improves the energy consumption level of the vehicle.

The disclosure provides an electrode quality control method and electronic equipment, including: determining the slurry used to prepare the calibration code identification electrode, and determining the square resistance corresponding to the slurry according to the first corresponding relationship obtained in advance; determining the calibration code identification The expected resistance of the electrode, and determine the length of the electrode gap according to the expected resistance, the square resistance and the second corresponding relationship obtained in advance; perform screen printing according to the length of the electrode gap to realize the preparation of the calibration code identification electrode. The functional relationship between the parameters is established through the experimental results, and the electrode gap length is calculated according to the determined resistance of the correction code electrode and the square resistance corresponding to the slurry, so that the production efficiency of the electrode can be effectively improved, and the mass production of the electrode is facilitated.

The present invention relates to a method used in the field of hydraulic technology, in particular, it relates to a hydraulic cylinder low-pressure linear output implementation method. Said method is characterized by that it utilizes hydraulic cylinder proportion regulation method, when the hydraulic cylinder is worked, it can simultaneously apply pressure to upper and lower two faces of the piston of hydraulic cylinder, and utilizes the pressure difference of upper and lower two cavities of the hydraulic cylinder to produce working pressure so as to implement low-pressure high-accuracy control of hydraulic cylinder. Besides, said invention also provides the concrete steps for implementing said method.

The invention relates to a method for reducing plating accompanying plates of a VCP electroplating production line. A plating accompanying plate is arranged in front of an electroplated plate at first, the area of the single electroplated plate, the speed of the electroplated plate entering an electroplating cell and the electroplating density are input into a PLC through a keyboard input module,the PLC controls a servo motor to control the electroplated plate to enter the electroplating cell, when the plating accompanying plates in front of the electroplated plate starts entering the electroplating cell, the PLC sends a control command to drive a commutating machine to control the electroplating current of the electroplating cell, and the electroplating current is linearly increased until electroplating starts. By adding the programmable logic controller, the servo motor, the commutating machine, a photoelectric sensor and an encoder to the VCP electroplating production line, whereinthe servo motor, the commutating machine, the photoelectric sensor and the encoder are connected with the PLC, linear control over the electroplating current is achieved, traditional current increasing modes are changed, application of vertical and continuous plating accompanying plates is reduced, and the production cost is reduced.

The invention discloses a linear field weakening control system of an embedded permanent magnet synchronous motor, and belongs to the technical field of motors. The linear field weakening control system comprises the embedded permanent magnet synchronous motor, a linear field weakening controller, an inverter and a rotating speed detection module. The linear field weakening controller is provided with a first linear field weakening control area, a second linear field weakening control area and a third linear field weakening control area. The rotating speed of the embedded permanent magnet synchronous motor is detected through the rotating speed detection module and sent into the linear field weakening controller, the corresponding linear field weakening control area is selected by the linear field weakening controller according to the target rotating speed, the linear field weakening controller controls the inverter to conduct power amplification an output current control signal according to the current control signal output by the corresponding linear field weakening control area, and the embedded permanent magnet synchronous motor is driven to rotate. The linear field weakening control system is simple, high in control speed and high in reliability, constant torque output is achieved when the speed is low, constant power output is achieved when the speed is high, the output torque is large when the speed is low, the speed adjustment range is wide, and the linear field weakening control system has the good application prospects in the fields such as electric vehicles.

The invention discloses a control method of a device capable of controlling the air quantity in an air conditioner. The control method comprises the steps that the total adjustment amount of an environment adjustment parameter of the air conditioner and the relative distance between a baffle and a fixed panel are obtained; according to the total adjustment amount and the unit adjustment amount of the environment adjustment parameter, the moving distance is calculated; the difference value between the moving distance and the relative distance is calculated; and according to the difference value, the baffle is controlled to move. According to the control method of the device capable of controlling the air quantity, the moving distance is calculated based on the obtained total adjustment amount of the environment adjustment parameter of the air conditioner and the obtained unit adjustment amount of the environment adjustment parameter, the difference value between the moving distance and the relative distance between the baffle and the fixed panel is calculated, the baffle is controlled to move according to the difference value, if the calculated difference values are different, the baffle is controlled to move by different distances, the baffle is moved according to the calculated difference values and can be moved to any position on the fixed panel according to the different difference values, and therefore linear control over the ventilation area of the device capable of controlling the air quantity is achieved.