Abstract: An acceleration and deceleration controlling apparatus in which a positional moving amount supplied from a host is converted into an accumulated value of absolute positions by two serially connected accumulators to be output to a first stage of a buffer registers 4. A switch 5 is provided to read out a value from a desired register among the buffer registers 4. The switch 5 changes the substantial number of stages of the buffer registers 4. At the same time, by correspondingly switching the divisor of the divider 7, the time constant for the acceleration and deceleration are desirably changed, which contributes to optimize the acceleration and deceleration time and to reduce the processing time.

Abstract: The portion to be deformed of a metal sheet is heated by irradiating it with a laser beam which is scanned at a high speed, and, when the portion to be deformed has attained a predetermined temperature, a bending force is applied to the portion to be bent to perform bending of the metal sheet. When the shape of a metal sheet is to be worked into a circular arc of 90.degree. having a predetermined radius by means of six bending processes, the metal sheet is worked such that the working process is divided into six processes and the bending processes are sequentially performed after fixing a metal sheet edge of the metal sheet. The yield strength of a steel material is reduced when it is heated and a metal sheet is worked using a laser by which a local heating is possible. Dies are therfore unnecessary, whereby processing at low costs and an apparatus therefor may be achieved.

Abstract: The amount of relative in-surface rotation between two scales of a position detector is precisely detected to thereby determine the deviation in longitudinal phase between tracks in one scale. Thus, positional data corresponding to signals from the tracks are made appropriate. The resultant positional data are used so that stable detection of an absolute position is performed.

Abstract: A numerical control apparatus for controlling feed shafts and a spindle of good machining and so on are possible because the control state is monitored at all times and provision is made for altering control parameters in accordance with the control state. The numerical control apparatus includes a detector for detecting the control state of the feed shafts and the spindle, a calculator for calculating control parameters based on the detected operating state of the feed shafts and the spindle, and a setter for setting the calculated control parameters, thereby changing the control parameters in response to the operating state of the feed shafts and the spindle.

Abstract: In a feedback controller for NC controlled machine tools, the position and the velocity of a work is detected and compared with the desired position. By this comparison, the work velocity is calculated and compared with the current velocity, which determines torque of a driving motor. A torque compensation signal generator, receiving the current velocity, generates a compensation signal according to a predetermined velocity/torque function. The signal is composed with a torque signal passed to a driving motor, and torque compensation is performed. A periodic reaction detector detects periodic fluctuation of the work caused by periodic load fluctuation, and a torque compensation direction causes a signal generator to suppress the fluctuation at desired occasions.

Abstract: A linear attuator of the present invention performs the fixing of a driving base by the primary fine means when the deflection of the moving velocity of the driving base in a driven direction and the moving velocity of the primary fine means driven by the secondary fine means in the driven direction becomes less than or equal to a specified allowable value, i.e., when the relating velocity becomes nearly zero, and moves the primary fine means driven by the secondary fine means in the direction opposite to that of the driven direction after not transferring the driving force of the secondary fine means to the driving base when the driving base is separated from the primary fine means. Thus, the driving base can be driven by a stroke longer than the driving stroke of the fine actuator itself at a specific velocity and it can be driven smoothly.

Abstract: An induction motor is controlled using a control device having a current control loop by detecting a current of the induction motor, and by detecting a current error corresponding to a difference between the detected current of the motor and a current command signal of the control device. The current error is processed to obtain a slip frequency. A field speed control command is generated based on the slip frequency and a motor speed of the induction motor.

Abstract: The drive control apparatus for a linear actuator according to the present invention uses fine actuators, such as an electrostrictive element, so that it is possible to manufacture a linear actuator drive control apparatus obtaining big driving force in spite of a size considerably smaller than the conventional magnetic motor and linear motors utilized electromagnetic force. In addition, since the fine actuator and the driving base repeats their fixings and seperatings, it is possible to make the driven stroke range of the driving base wide. Since the fixing operation and the separating operation are carried out when the speeds of the fine actuator and of the driving base are almost the same, generation of the shock due to sudden speed change of the fine actuator and the driving base at the same of their fixing and separating is prevented, and it is possible to obtain smooth driving of the driving base.

Abstract: During synchronous control, a first servo motor controls a position of a first spindle system and a second spindle system having a second servo motor makes calculations for estimating the torque required for the second servo motor and gives a command, so that, when a rotational phase difference between the two servo motors exceeds a predetermined value, the rotational phase difference is made equal to zero by a rotational phase difference signal. A torque command to the first servo motor, an inertia ratio between the first and second servo motors, the rotational resistance of the two spindle systems and so on are input to a torque estimator which makes calculations for estimating the torque required for the second servo motor. The estimated torque is used to control the second servo motor. The two servo motors thus generate the appropriate torque when a work held between the two spindle systems is processed. It is therefore possible to significantly reduce the torsional torque applied to the work.

Abstract: A braking device for a rotary motor includes a braking member movably mounted to a non-rotating member of the rotary motor. The braking device further includes a compression spring coupled to the braking member for exerting a force on the braking member to cause the braking member to contact a rotating member of the rotary motor. The braking device further includes a piezoelectric element for actuating in response to a signal applied thereto to exert a force on the braking member to counteract the force applied to the braking member by the compression spring so as to cause the braking member to separate from the rotating member of the rotary motor.

Abstract: A linear encoder has a plurality short main scales arranged separately in their longitudinal direction and plural sliders situated in parallel with the longitudinal direction so as to more along these main scales. In operation, data obtained through these sliders are joined and processed in a signal processor in order to get position data of a table. Consequently, any position along a long movement stroke of the table can be detected easily and at a low cost.

Abstract: In the prior art, a DC motor is often utilized for controlling speed of servomechanism for its simpleness in operation and excellent control. However, as a DC motor is equipped with brushes and commutators, it inconveniently requires periodical maintenance and inspections in order to keep normal operation. As electric semiconductors such as power transistors along with control technology have made a remarkable progress in recent years, a demand for motors which do not need maintenance is keenly felt. Studies have been conducted on control by DC motors and some have been put into practice. According to this invention, there is provided a synchronous motor which has a small field loss and which does not need slip rings or rotary transformers. Further, there is provided synchronous motor which can be simply constructed at a low cost without using a permanent magnet as a rotor and which can realize a larger capacity, and provided a control unit for the synchronous motor.

Abstract: This invention concerns an improvement for the structure of a rotor attachment in a permanent magnet type synchronous motor. This invention can effectively prevent axial displacement or peeling off of the magnets which might otherwise be caused by insufficient adhesion or deterioration of adhesives by the unique structure of attaching magnets to the rotor shaft as side plates having grooves are fixed to both sides of magnets adhered to a shaft to engage with at least one end face of magnets and the outer peripheries of the side plates and the magnets are wound with non-magnetic fibers for securing, thereby greatly enhancing the reliability of the motor.