33results about How to "Stable torque output" patented technology

A screw capping head for use in a rotary capping machine includes a housing defining a longitudinal axis, a spindle rotatably carried by the housing, a first ring of magnets fixed within the housing, and a second ring of magnets coupled to the spindle for rotation with the spindle. The second ring of magnets is movable, without the use of tools, in the longitudinal direction with respect to both the spindle and the first ring of magnets to achieve a plurality of nested positions with respect to the first ring of magnets. The first and second rings of magnets define a magnetic torque coupling between the housing and the spindle, the strength of the torque coupling varying in a substantially linear relationship to the nested positions of the first and second rings of magnets.

The invention discloses a gas injection quantity uniformity control system and control method of a natural gas engine for a vehicle, which includes an ECU, a natural gas supply bottle and an injection system equal to the number of cylinders of the engine, and each injection system includes at least one gas rail and The injection unit connected to the ECU has a metering unit between the air inlet of each air rail and the high-pressure solenoid valve. Each metering unit includes a millisecond-level rotameter connected to the ECU. The millisecond-level The rotameter can measure the transient flow of natural gas at the millisecond level. After adopting the above-mentioned structure and method, the uniformity of natural gas injection volume can be significantly improved, the control problem caused by the consistency of nozzles in the natural gas engine control system can be solved, the state of the injection system can be monitored in real time, and the stable torque output of the natural gas engine can be maintained, which is beneficial The development of in-cylinder direct injection lean-burn natural gas engine is applicable to natural gas engines of various displacements.

The invention relate to a vector control method for controlling motor rotation. The vector control method comprises the following steps of judging whether an electrical angle absolute initial value exists or not; if the electrical angle absolute initial value does not exist, obtaining a current electrical angle value, a quadrature-axis voltage control quantity, a direct-axis voltage control quantity, and an electrical angle absolute initial value at the initial mode; if the electrical angle absolute initial value exists, obtaining an angle value of an absolute angle position sensor, and obtaining the current electrical angle value according to the angle value of the absolute angle position sensor and the electrical angle absolute initial value; and obtaining the duty ratio of output PWM according to the current electrical angle value, the quadrature-axis voltage control quantity and the direct-axis voltage control quantity, so as to control rotation of the motor.

The invention provides a vehicle starting control method and system and a vehicle, and the method comprises the steps that when it is detected that the vehicle has a starting demand, a whole vehicle power control unit PCU controls a power source torque and a clutch torque slope, and the power source torque, a clutch reference torque and a clutch offset torque act together to control the starting demand of the vehicle; finely the target transmission torque of the clutch is adjusted in real time according to the actual rotating speed of the power source, and the power source end rotating speed is guided to rise to the target rotating speed along with the guiding rotating speed until the power source rotating speed is synchronous with the gearbox input shaft rotating speed. According to the method, the power source end and the clutch load end are controlled, the fluctuation of the rotating speed of the power source end is weakened through the combined action of the clutch reference torque and the clutch offset torque, the stable torque output is ensured, and the good starting smoothness and dynamic property of the vehicle are obtained. Due to the fact that complex calculation is not needed, power assembly torque output and clutch transmission torque are determined, rotating speed fluctuation caused by PID closed-loop control is weakened, different stages of rotating speed rising do not need to be refined, and therefore control and calibration are easier.

The invention provides an engine for a motorcycle. For the engine, the diameter of a gas inlet of a cylinder head is 21 to 23millimeters, and the diameter of a gas outlet is 19 to 21 millimeters; the eccentricities of left and right cranks are 30.5 to 32.5 millimeters, and the centre distances of mounting holes on both ends of a connecting rod are 104.5 to 105.5 millimeters; the height of a cylinder body is 75.5 to 77.5 millimeters, the internal diameter of a cylinder sleeve is 54 to 56 millimeters, and the height of the cylinder sleeve is 101 to 103 millimeters; the diameter of an upper end opening of a gas inlet tube is 24 to 26 millimeters, and the diameter of a lower end opening of the gas inlet tube is 21 to 23 millimeters; and the length of a convex hull of a rotor of a magnetic motor is 13 to 18 millimeters, and the included angle between the center of the convex hull and a keyway of the rotor of the magnetic motor is 50 to 60 degrees. The engine has the advantages of effectively improving gas-intake efficiency of the engine, increasing an operating stroke of the engine, reducing rotating speeds of the cranks in all strokes and the rotating speed section of the maximum torque point of the engine, ensuring that the engine can output big torques at the middle/low rotating speed and improving reliability and durability of the engine.

The invention provides a micro-step drive control method of a permanent magnet synchronous motor. The method comprises the steps that a current position of a permanent magnet synchronous motor rotor is detected through a position sensor, and the position of the rotor at the next moment is obtained through calculation; a current value of a permanent magnet synchronous motor stator is detected, and a stator three-phase current of the permanent magnet synchronous motor and a current component under a two-phase static coordinate system are obtained; a current component under a synchronous rotating coordinate system is obtained according to the position of the permanent magnet synchronous motor at the next moment and the current component under the two-phase static coordinate system; a current difference value is obtained finally, a reference voltage, an SVPWM reference input voltage and the three-phase PWM duty ratio under the synchronous rotating coordinate system are generated, a drive voltage of a next cycle is obtained, and drive is completed. By means of the micro-step drive control method of the permanent magnet synchronous motor, the defect that for an existing closed-loop control scheme, when the situations that load inertia is large, control is not stable is overcome, good positioning performance for a large inertial load is achieved, the robustness is strong, the reliability is high, and the control effect is good.

The invention provides a duty ratio design method and system for eliminating current sampling interference, a medium and equipment. The duty ratio design method for eliminating current sampling interference comprises the following steps: synchronizing the clock signal of a power factor corrector with the clock signal of a frequency converter to enable the clock signals used by the power factor corrector and the frequency converter to be the same; under the same clock signal, setting the switching frequency of the power factor corrector to be a fixed multiple of the switching frequency of the frequency converter; setting the sampling time of the frequency converter according to the parity of the fixed multiple; and obtaining the size relationship between the duty ratio time and the samplingtime of the frequency converter through comparison, and performing phase shift on the duty ratio of the power factor corrector according to the comparison result, wherein the duty ratio time and theduty ratio of the power factor corrector are determined according to the switching period of the power factor corrector. Through the PFC duty ratio control method provided by the invention, the problem of current sampling interference generated in an occasion where the PFC and the frequency converter are used at the same time is solved.

The invention discloses a device and method for controlling a moment and belongs to the field of control. The device comprises a receiving module, an overlapping module, a processing module and an interference identification module. In the invention, moment ripples are subjected to active compensation, the systematic interference is effectively inhibited, the stable output of the moment of a motor is realized, the speed of responding to the moment is guaranteed, the systematic delay is avoided, a force sensor is not required, and the anti-interference capability is strong in the engineering.

The invention provides an active vibration damping method for the torsional vibration of an engine-motor coupling system and belongs to the field of engine control. The method comprises the steps of firstly installing a torque sensor assembly applied to a hybrid engine; calculating the integrated output torque of a power system, the desired torque of the engine and the desired torque of an ISG (Integrated Starter Generator) motor by a vehicle control unit according to throttle opening signals at any time; obtaining the vibration damping torque of the ISG motor according to the difference valuebetween the desired torque and the actual output torque of the engine and obtaining the integrated output torque of the power system by combining with the desired torque of the ISG motor; and carrying out closed-loop control on the integrated output torque to obtain the control quantity of the ISG motor and realize active vibration damping. The method provided by the invention has the beneficialeffects that the torque fluctuation of the power system can be reduced; the torsional vibration of a drive system is reduced; and the risk that a shaft system of the drive system is broken due to thevibration is reduced.

The invention discloses a water-cooled motor stator iron core fixing structure and a fixing method thereof. According to the fixing structure, a stator iron core and a water channel pressing plate are connected rigidly by utilizing steel pins and colloid injected into a shell, the water channel pressing plate and the stator iron core, the water channel pressing plate is also connected with the shell rigidly, and therefore fixation of the stator iron core is achieved. The fixing structure enables air gaps between a stator and a rotor of a water-cooled motor to be more even and motor torque output to be stable, and noise can be lowered effectively. According to the fixing method of the water-cooled motor stator iron core fixing structure, the hot press fitting technology does not need to be adopted, only a common press fitting technology is needed, the technology is simple, and assembling cost can be reduced. When the hot press fitting technology is adopted, the risks of uneven deformation exist in heating and cooling deformation processes, the unevenness can be transmitted to the air gaps between the stator and the rotor, and the performance of the motor is further influenced, but no mentioned risks exist in the fixing method of the water-cooled motor stator iron core fixing structure.

The invention discloses a loop superposition magnetic circuit switch reluctance direct current motor. The motor comprises a stator unit and a rotor unit arranged in the stator unit. The stator unit comprises a number of split stator iron core laminations arranged in a cabinet, stator windings wound on the salient poles of the stator iron core laminations, stator permanent magnets, and an iron-magnetically permeable wedge assembly used for fixing the stator iron core laminations and the stator permanent magnets. A stator permanent magnet of the same polarity is placed on the ring direction surface of both ends of each independent stator iron core lamination. A stator iron core lamination and a stator permanent magnet form a unipolar stator iron core lamination single body. After a stator winding on the salient pole of a stator iron core lamination is energized, an electromagnetic field generated by the winding of the phase and a permanent magnetic field are superimposed, strengthened and applied on the rotor. The rotor is in a non-winding non-magnet salient pole type structure. The loop superposition magnetic circuit switch reluctance direct current motor provided by the invention uses the structure, and has the advantages of high work efficiency, low power consumption, high power density, smooth operation and excellent comprehensive performance.

The invention relates to a drive control system for brushless motors. According to the drive control system, a stability digital control system is connected with at least one power digital control system, and communicates with the power digital control systems according to the order of the power digital control systems. The power digital control systems are connected with at least one brushless motor, and are used for getting the duty ratio of output PWM according to the current electrical degree value, the alternating-axis voltage control quantity and the direct-axis voltage control quantity to control the rotation of the brushless motors, and saving the absolute initial value of electrical degree when an acquired control instruction is an end instruction.

In a steering control device, a plurality of control systems is configured to switch a drive mode to a cooperative drive mode when command values calculated by control units of the control systems are not different from each other and to switch the drive mode to an independent drive mode when the command values calculated by the control units of the control systems are different from each other. The control systems are configured to gradually limit the command values respectively calculated by the control units of the control systems when a start switch of a vehicle has been turned off. The control systems are configured to switch the drive mode to the independent drive mode regardless of whether the command values calculated by the control units of the control systems are different from each other when the start switch has been turned off while the vehicle is traveling.

The invention discloses a combined automatic constant tension pneumatic twine tensioner. The combined automatic constant tension pneumatic twine tensioner comprises twine tensioner bodies and coiling block assemblies connected to the twine tensioner. One twine tensioner body is connected to one or more coiling block assemblies or one coiling block assembly is connected to the plurality of twine tensioner bodies. Each of the twine tensioner bodies comprises a power driving mechanism, a slide valve guiding mechanism and a stress housing and a clutch mechanism. The slide valve guiding mechanism is arranged on the side portion of the power driving mechanism, and the stress housing and the clutch mechanism are arranged on the outer side of the power driving mechanism and the slide valve guiding mechanism. By changing a conventional piston rod to a piston plate and arranging a transmission shaft and the piston plate in a cross manner, the transmission shaft and the piston plate do not interfere with each other; and two air cylinders which are mutually collaborated are adopted as a power driving source, and the steering structure is compact, small in size and large in bearing capacity.

The invention provides a rotor position fault identification and compensation method based on an aviation three-level motor starting/power generation control system. The method comprises the steps of: firstly calculating a rotor position variable quantity in each sampling interval through using a collected rotor position; using a difference value between the rotor position variable quantity of the current period and the rotor position variable quantity of the previous period, namely delta theta<current period>-delta theta<previous period>, as a rotor position sampling fault judgment condition; when the delta theta<current period>-delta theta<previous period> is greater than a set threshold value, performing rotor position compensation and performing fault counting; and when the fault count exceeds a set number of times within the given time, reporting rotor position sampling faults, and stopping startup. According to the rotor position fault identification and compensation method, the rotor position can be continuously compensated under the condition that a rotor position sampling error occurs in a continuous period of time under the condition that a rotary transformer is disturbed, so that stable torque output and acceleration starting of the motor are ensured, and the tracking control stability and timeliness of a servo control system are met.