Abstract: In a motion control apparatus for an induction motor, an inclination of acceleration/deceleration curve representing an increase/decrease per unit time in rotation speed of the induction motor is changed in accordance with the value of an angular frequency .omega.s corresponding to a slip speed of the induction motor.

Abstract: The acceleration/deceleration control apparatus using slip speed detects an angular frequency .omega.r corresponding to an execution speed of an induction motor and derives an angular frequency .omega.s corresponding to a slip speed corresponding to a slip speed in response to a torque of the said motor, from a vector controller of the said motor.On the other hand, an allowable value .omega.s' of said angular frequency corresponding to the said .omega.r is prepared beforehand, and is compared with said angular frequency .omega.s.According to the result of this comparison, the IM rotation is controlled. So even if the induction motor is used as servo motor, no shock of the torque will flow through the motor and the motor itself will not be stalled.

Abstract: An induction motor control apparatus includes a detector, a memory, a correction current generator, and a primary current correction circuit. The detector detects a rotational position of a rotary magnetic flux generated by a multi-phase primary current applied to a primary winding of an induction motor. The memory stores correction values corresponding to measured values of torque ripples periodically generated in correspondence with the rotational positions of the magnetic flux, receives an output from the detector for detecting the rotational position of the magnetic flux, and outputs one of the correction values stored in the memory in correspondence with the rotational position. The correction current generator generates a correction current by the correction value read out from the memory in correspondence with the rotational position of the magnetic flux. The primary current correction circuit corrects the primary current by the correction current.

Abstract: A three-phase induction motor includes winding slots and a stator winding. The number of winding slots per pole per phase is a noninteger. The stator winding is a three-phase balanced winding. A pitch s of the winding satisfies s=(r-t)/r or s=r/(r+t) (where t is an odd number and r is the order of a harmonic wave to be suppressed).

Abstract: There is provided a digitized motor control apparatus which is capable of digitally effecting all the functions of the motor control apparatus except those involved in energy conversion.

Abstract: Input signals supplied for each block to an interpolator for a numerically controlled machine comprise displacement signals representative of conventional displacement data in terms of a conventional step size and a feed rate signal representative of a feed rate which, in turn, defines a conventional pulse distribution rate. The interpolator selects, in response to the feed rate signal, a working step size to be an integral multiple or an integral submultiple (exclusive of unity) of the conventional one, derives working displacement data and a working pulse distribution rate by dividing the conventional ones by the multiple or submultiple, and carries out pulse distribution in a conventional manner but by the use of the working displacement data and feed rate to produce those distribution signals at the working pulse distribution rate which make servos feed a machine tool relative to a workpiece with the working step size and at the feed rate.

Abstract: A synchronous digital data processing system employing single-phase clock pulses comprises arithmetic and control units which are capable of completing an operation during one clock pulse period. The data processing system includes closed data paths wherein only one stage of a memory circuit capable of the same operation as a master/slave flip-flop is used as a data register in the arithmetic unit and as an address register in the control unit. In either case, during one cycle of a single-phase clock pulse, an input data is set in the memory circuit, and the output of the memory circuit is renewed in response to the input data. The output of the memory circuit is held until it is renewed in the following cycle.