95results about How to "Precise torque control" patented technology

A motor control device includes a current detecting unit detecting current flowing into a motor winding, a speed/electrical angle estimating unit estimating a rotational speed and an electrical angle of the motor, based on the current, a load torque estimating unit estimating load torque to be developed by a load, from a torque current obtained based on the current and the electrical angle, a motor constant and inertia moment of the motor inclusive of the load, a load torque phase calculating unit calculating a phase of periodic fluctuation indicated by the load torque, a torque-compensating current determining unit determining a sinusoidal torque-compensating current, based on the load torque phase, and an amplitude/phase adjusting unit detecting speed fluctuation of the motor to adjust amplitude and phase of the torque compensating current by increasing or decreasing the amplitude and the phase so that the speed fluctuation is reduced.

It is attained by being provided with a motor constant calculation unit for calculating electric constants of a motor, and by correcting setting values of electric constants defined on one of the axes of two orthogonal axes, by a functional expression using a state variable defined on the same axis, and by correcting them by a functional expression using a state variable defined on the other axis.

The invention relates to a servo bottle cap screwing mechanism in the technical field of packaging machinery, which comprises a cap screwing head, a waste cap withdrawing mechanism, an idler wheel mechanism, base blocks, a servomotor, a connecting support and a motor control system, wherein, the cap screwing head, the idler wheel mechanism, the servomotor and the connecting support are arranged on the base blocks, the motor control system controls the servomotor to rotate at certain rotating speed and torque, and the generated dynamic power is transferred to the cap screwing head by the idler wheel mechanism, so as to cause the cap screwing head to rotate along with the servomotor; the connecting support is connected with a lifting guide rod to drive the base blocks to raise and fall periodically, and the height of the waste cap withdrawing mechanism is unchanged, and the waste cap withdrawing mechanism is arranged at a cap screwing machine. Under the germfree condition, the entire bottle cap screwing mechanism is lubrication free, has no leakage, is convenient for frequent rinsing and disinfection; the cap screwing torque is controlled by computer, the cap screwing mechanism is driven by servomotor and has large adjustable range; and besides, the working torque, the cap screwing speed, and the like, of the single cap screwing mechanism can be displayed, and the cap screwing mechanism can automatically discharge waste or abnormal caps.

The invention provides a hydraulic drive joint for robots, namely a robot joint based on the integration of a hydraulic plug-in rotary direct-drive valve and a blade rocking cylinder; a hydraulic actuator, an electrohydraulic servo valve, and detection elements, a position sensor and a pressure sensor, are modularly integrated and applied to the robot joint; the requirement for the development ofexisting robots can be met, and applicable range of the robots can also be widened. The hydraulic drive joint for robots comprises a threaded plug-in rotary direct-drive electrohydraulic servo valve,and a blade rocking hydraulic cylinder special for robot motion joints; the threaded plug-in rotary direct-drive electrohydraulic servo valve is abbreviated hereinafter as a hydraulic plug-in rotary direct-drive valve; the blade rocking hydraulic cylinder special for robot motion joints is abbreviated hereinafter as a blade rocking cylinder; a valve mounting cavity is pre-manufactured in one end of the center of a center spindle of the blade rocking cylinder; the shape of the valve mounting cavity is made according to the shape of an insert portion of the hydraulic plug-in rotary direct-drivevalve; the hydraulic plug-in rotary direct-drive valve is plugged in the valve mounting cavity.

A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio. The engine is controlled using the target output torque.

Disclosed are a control device and a control method that are used with an internal combustion engine in which the air-fuel ratio in the vicinity of an ignition plug differs from the overall air-fuel ratio in a cylinder, and capable of properly fulfilling demands concerning various capabilities of the internal combustion engine by accurately reflecting each of the demands in the operation of each actuator. Three physical quantities, namely, a torque, an efficiency, and an air-fuel ratio, are used as controlled variables for the internal combustion engine. Target values for the controlled variables are then set by integrating at least some of demands concerning a capability of the internal combustion engine into the three physical quantities. Further, in accordance with the target values for the three controlled variables, namely, the torque, the efficiency, and the air-fuel ratio, three operation amounts, namely, an intake air amount adjustment valve opening, an ignition timing, and a fuel injection amount are set, and a fourth operation amount for adjusting the air-fuel ratio distribution in the cylinder is set.

An operator interface for a control system for a bulk material baler includes interface means such as a touch screen or keyboard for an operator to enter process parameters into a control system memory. A display shows process parameter fields into which an operator may enter desired control parameters. The display also displays data feedback from baler process sensors. The baler control system then controls baling parameters as the operator directs including: strap feed position, strap feed speed, strap feed torque, strap release tension, tying cylinder position, tying cylinder speed and tying cylinder torque. The operator may also control carriage movement, alarm limits, shut off limits and monitor on the display baler processing data both currently and historically. Other aspects of automated baling may be optionally monitored or controlled through the operator interface of the present invention.

An FCS-MPDTC control system for a PMSM capable of expanding a voltage space vector output includes a proportional-integral (PI) controller, model prediction, vector adjustment, voltage observation, ABC-[alpha][beta] conversion, one-beat lag compensation, pseudo output voltage space vector selection, a two-level voltage source inverter and a permanent magnet synchronous motor. The control method, based on a torque control strategy capable of expanding an output voltage space vector range performed by two-step model prediction, can be developed on a comprehensive experimental platform of dSPACEand Typhoon HIL Q402. The system achieves good magnetic flux linkage and torque control performance, a small amount of calculation related to the algorithm, low current total harmonic distortion (THD), low development cost of the hardware requirements, and fast and real-time result monitoring, and is universal in development and test of power electronic drive systems.

The invention discloses a continuous-spinning assembly and disassembly frame and a torque and rotation speed control method. Through torque control, the requirements for torque of spinning at different stages are met, breakout is configured through separation and reunion, therefore, during continuous spinning and reciprocating punching, a workpiece does not need to be clamped repeatedly and makeup and breakout can be completed through one-time clamping. For most driving devices, due to the fact that the output power is fixed, when the speed is high, output torque is reduced correspondingly, therefore, the spinning speed can be automatically switched according to spinning torque by using the characteristic, the smaller the torque is, the higher the rotation speed is, and the working efficiency is effectively improved; when a set torque value is reached, unloading can be conducted automatically, and relatively accurate control over the torque is realized.

When output voltage V₁ of an electric power converter reaches a prescribed voltage V₁*_ref, a difference between V₁ and V₁*_ref is integrated to correct a commanded torque to τo* (τ*=τo*+Δτ).

The invention relates to a method (100) for controlling a thread laying device comprising two impellers (26, 28) which can be driven in opposite directions in order to move a thread to be wound on a rotating spool back and forth between two turning points (U1, U2) along the spool longitudinal axis by means of a traversing movement with a target traversing stroke width (Hs) of the thread laying device, said target traversing stroke width differing from a base traversing stroke width (HN). According to the invention, each impeller (26, 28) being moved in the idle traversing stroke, i.e. each idle traversing stroke impeller (26, 28), is first accelerated or braked to an overcompensation angular speed (Voc) in the idle traversing stroke interval (TL) of the impeller, said overcompensation angular speed being determined on the basis of a theoretical constant compensation angular speed (Vc) required to transfer the thread in the next turning point (U1, U2) of the traversing movement of the thread. The impeller is then moved at its specified operating angular speed (Vw) in order to receive the thread from the other impeller (26, 28) guiding the thread at the operating angular speed (Vw) in the next turning point (U1, U2) of the traversing movement of the thread. The invention further relates to a thread laying device and to a winding machine comprising such a thread laying device.

The invention discloses a permanent magnet motor controller applied to a pure electric car and a control method. The controller is mainly composed of a power panel, a control board, a drive board and a power component; the power panel is connected with the control board, the drive board and the power component; the control board is connected with a vehicle controller through a CAN bus; the control output of the control board is connected with the drive board; the output of the drive board is connected with the power component; a group of analogue quantity inputs of the control board are respectively connected with a current transformer and a rotary transformer; the current transformer is connected with a power terminal of the permanent magnet motor, and the rotary transformer is connected with the rotating shaft of the permanent magnet motor. The permanent magnet motor controller applied to the pure electric car disclosed by the invention can precisely control the rotating speed of the motor, effectively reduces the switching loss and greatly improves the dynamic response speed of the system and the acceleration characteristics of the motor. The controller can meet the requirement of the pure electric car, of which the power requirement is less than 60KW, just by exchanging a cooler and the drive board as to the electric cars with different requirements, and saves the production cost and the production cycle for a manufacturing plant of the controller.

The invention relates to a stamping servo compensation system and a working process thereof. The stamping servo compensation system is composed of a human-computer interaction interface, a PLC motion controller, a hydraulic servo pump system, a servo proportional valve, a position sensor, pressure sensors, an electric control element, a hydraulic cylinder body and a stamping fixing template. One way of the PLC motion controller is connected with a servo pump drive which is connected with the servo pump. The servo pump is connected with the first pressure sensor. The other way of the PLC motion controller is connected to the servo proportional valve controlled by the PLC motion controller. The other way of the PLC motion controller is connected with the second pressure sensor and a displacement sensor. The displacement sensor is used for detecting the position of the stamping fixing mould plate. The stamping servo compensation system has the beneficial effects that by the utilization of the servo hydraulic drive and a position sensor feedback position closed-loop control system, high-precision pressure, position and synchronous control can be achieved; the servo pump driven by a servo motor is utilized, during standby, the motor does not rotate, and the energy-saving effect is remarkable; and torque and rotating speed of the servo motor are controlled precisely, and high-precision pressure and flow control is achieved.

The invention discloses a control method of a clutch for a hybrid power vehicle, and belongs to the technical field of control of vehicle clutches. The control method mainly comprises the following steps: (1) a HCU (Hydraulic Control Unit) sends a clutch transfer torque demand to a CCU (Central Control Unit); (2) the CCU calculates and analyzes a received clutch transfer torque demand signal to obtain a clutch demanded position; (3) an actual clutch position is obtained through a clutch position sensor; and the clutch position is adjusted according to the difference between the demanded position and the actual position of the clutch, so that the clutch moves to the demanded position; and (4) the actual clutch position is obtained through the position sensor in real time, and the moving direction of the clutch is adjusted until the demanded position is reached. The control method solves such technical problems as easy motor damage, high processing precision requirement, low control precision and system unreliability. The control method realizes the mode switchover, the torque transfer, the starting/parking and the gear shifting separation of the hybrid power vehicle and the precise torque control of the clutch.