摘要:
An actuator drive control apparatus is equipped with a movement distance setting means for setting a movement distance of a displaceable member, a movement time setting means for setting a movement time, a target value calculating means for calculating a target value of a displacement amount or a displacement velocity of the displaceable member at an arbitrary timing based on the movement distance and the movement time, and a drive controller for generating driving power based on the displacement amount or the displacement velocity target value of the displaceable member and sending the drive power to an actuator.
摘要:
Each time the number of cumulative rotations of a spindle rotating motor 11 reaches the number of cumulative rotations set in a position data table T, a CPU 22 reads out the mobile positions of a work piece and tool at thus reached number of cumulative rotations and the next number of cumulative rotations to reach from a position data storage section 25, and reads out a moving speed characteristic between the reached number of cumulative rotations and the next number of cumulative rotations to reach from a moving speed characteristic storage section 27 according to an auxiliary operation designation in the position data table T. Thereafter, assuming the reached number of cumulative rotations to be a start point and the next number of cumulative rotations to reach to be an end point, the CPU 22 divides the part between the start and end points into predetermined timings, and defines the mobile positions of the workpiece and tool at each of the divided timings according to the read-out mobile positions of the workpiece and tool and moving speed characteristic.
摘要:
Each time the number of cumulative rotations of a spindle rotating motor 11 reaches the number of cumulative rotations set in a position data table T, a CPU 22 reads out the mobile positions of a work piece and tool at thus reached number of cumulative rotations and the next number of cumulative rotations to reach from a position data storage section 25, and reads out a moving speed characteristic between the reached number of cumulative rotations and the next number of cumulative rotations to reach from a moving speed characteristic storage section 27 according to an auxiliary operation designation in the position data table T. Thereafter, assuming the reached number of cumulative rotations to be a start point and the next number of cumulative is rotations to reach to be an end point, the CPU 22 divides the part between the start and end points into predetermined timings, and defines the mobile positions of the workpiece and tool at each of the divided timings according to the read-out mobile positions of the workpiece and tool and moving speed characteristic.
摘要:
An apparatus and process for monitoring conditions of a control valve including a valve element operated by a drive controlled by a position controller. A spindle extends into a valve chamber through a dynamic seal and connects the valve element to the drive. The condition of the seal is monitored by measuring start-up time, stopping time and distance travelled. The start-up time relates to the time between application of control current to the position controller and sensing movement of the valve element. The stopping time relates to the interval between application of a second control current to the position controller and sensing the valve element has stopped. The distance travelled relates to distance the valve clement travels during the stopping time. A time difference is determined by subtracting the stopping from the starting time and is calibrated to a seal coefficient of friction. The distance travelled is also calibrated to a seal coefficient of friction. These two coefficients of friction are compared whereby a discrepancy indicates a change in air pressure has occurred during valve operation. These measurements are taken prior to and cyclically during valve operation. The coefficient of friction obtained during valve operation is compared with the coefficient of friction obtained prior to valve operation to indicate a change in the condition of the seal. If a change in air pressure occurred during valve operation, the coefficient of friction obtained by calibrating the travel distance is compared with the coefficient of friction obtained prior to valve operation.
摘要:
When a cylinder is urged to displace a piston rod, and a pulse signal is inputted into a counter from an encoder, then the number of pulses of the pulse signal is counted by a counting section. A time-measuring section starts measurement for the elapsed time upon the start of operation of the cylinder. When the pulse signal is inputted, the elapsed time is reset. When the displacement of the piston rod is stopped, the pulse signal is not inputted. The elapsed time is increased to make coincidence with a predetermined preset time to output, to a control unit, a preset time elapse signal indicating this fact. At this time, the preset count value is compared with the count value of the pulse signal counted by the counting section. If the both are coincident with each other, a coincidence signal indicating this fact is outputted to the control unit. Accordingly, it is possible for the control unit to detect the stop of the cylinder and detect the displacement position of the piston rod at this time.
摘要:
An acknowledgement-free method for the positioning of an actuator by means of an electric motor which is controlled as a function of time by a microprocessor, wherein there are proportionality constants K.sub.1, K.sub.2 of a formula Adjustment Path=K.multidot.Adjustment Time as well as the corresponding times T.sub.1, T.sub.2 for the braking of the rotor, after disconnection of the electric motor, from a first speed of rotation N.sub.a to a second speed of rotation N.sub.b. The constant K.sub.1 and K.sub.2 are the times T.sub.1 and T.sub.2 are determined and stored for the structural unit consisting of actuator and electric motor at at least two different loads B.sub.1, B.sub.2. Upon operation of the actuator, the time T.sub.x for the braking of the rotor from N.sub.a to N.sub.b is measured and, with the use of the stored times T.sub.1, T.sub.2, the proportionality constant K.sub.x corresponding to the time T.sub.x is calculated by linear interpolation and used for the control.
摘要:
A telescope is supported by an altazimuth mount driven by altitude and azimuth stepper motors. The mount is initially oriented by pointing the telescope at a reference location in the sky such as a known star and inputting its coordinates to a microprocessor-based control system. The telescope is then pointed at a target location such as a second known star and its coordinates are inputted. The microprocessor then executes a stored program that allows it to calculate the zenith coordinates (overhead point) from the coordinates of the reference and target locations, the angles the stepper motors traveled between the two pointings of the telescope, and the elapsed time between the pointings. The observer can then input the coordinates of any selected location and the telescope will automatically point at that selected location so that it can be viewed. The microprocessor also periodically re-positions the telescope to track the selected location and thereby compensate for the earth's rotation.