Abstract: A three-dimensional scanner according to one aspect of the embodiments includes an irradiation unit, an imaging unit, a position detecting unit, and a scanning-region determining unit. The irradiation unit emits a slit-shaped light beam while changing an irradiation position with respect to a measuring object. The imaging unit sequentially captures images of the measuring object irradiated with the light beam. The position detecting unit detects a position of the light beam in an image captured by the imaging unit by scanning the image. The scanning-region determining unit determines a scanning region in an image as a scanning target by the position detecting unit based on a position of the light beam in an image captured by the imaging unit before the image as a scanning target.

Abstract: A voice coil type linear motor with a cooling function. A closed magnetic circuit formed into the ?-shape, by an inner yoke provided between a pair of outer yokes made up of magnetic materials arranged in parallel with a longitudinal center axis in such a manner as to be in parallel with the pair of outer yokes. The outer yokes and side yokes are provided at both end portions of the inner yoke. Permanent magnets are provided on inner sides of the outer yokes and on outer sides of the inner yoke with polarities thereof which face opposite surfaces of the outer yoke. The inner yoke is made opposite to each other or with polarities thereof which face only the outer yokes being made opposite each other to thereby a field. An armature made up of a bobbin of non-magnetic and insulating materials is provided. A coil is provided around the bobbin between the permanent magnets via air gaps in such a manner as to move in an axial direction or in such a manner that. The coil is wound around the bobbin.

Abstract: Connectors (25a), (25b), (25c), (25d), (25e), and (25f) for electrically connecting lead wires of armature windings (4) coiled around armature blocks (10), (11), and (12) are provided at respective ends of a plurality of the armature blocks (10), (11), and (12) such that connections of the armature windings (4) in the respective armature blocks become parallel connections. The connector pair including the connectors (25b), (25c) and the connector pair including the connectors (25d), (25e), which are provided between the armature blocks, are embodied as in-phase connections. On condition that the number of phases of the armature winding is taken as three and a magnetic pole pitch of a magnetic field is taken as ?p, the armature blocks are spaced apart from each other at intervals of ? ?p.

Abstract: A motor control apparatus capable of expanding a voltage output and a modulating wave signal generating method for a PWM inverter apparatus of the motor control apparatus, which is controlled by a pulse width modulating signal obtained by comparing a modulating wave signal of a voltage instruction with a carrier wave are provided. An upper limit value calculation unit 105 and a modulation wave limiter unit 4 are provided, and an upper limit value 14 of a modulating wave, which is equal to or smaller than the maximum value of the carrier wave and equal to or larger than the minimum value of the carrier wave is produced in the upper limit value calculation unit 105 and modulating wave instructions 13 for a plurality of phases are corrected by the modulating wave control unit 4 by using the upper limit value 14 of the modulating wave.

Abstract: A power controller 5 calculates the induced voltage or rotor magnetic flux from the output voltage and the output current of a generator 3, estimates a shaft speed of the generator 3 from the phase of the induced voltage or the phase of the rotor magnetic flux, and calculate the output of a windmill 1 from the estimated value of the shaft speed and the output of the generator 3. As a result, since the output of the windmill 1 can be calculated without requiring a speed sensor for detecting the shaft speed of the generator 3, it is possible to accomplish simplification of circuits, reduction of cost, and high reliability.

Abstract: A linear motor including a plurality of movers (1a to 1c), each of which is formed with an armature having a polyphase balancing winding (Ru to Rw), and a stator having a permanent magnet or a secondary conductor is configured such that the plurality of movers (1a to 1c) are disposed on the single stator; and the polyphase balancing windings (Ru to Rw) in the respective movers (1a to 1c) are connected in series. Accordingly, there can be obtained an inexpensive linear motor which is capable of driving a large machine, which is capable of canceling cogging force, which offers facilitated assembly of movers, and which can provide thermal protection of the movers with ease.

Abstract: An object of this invention is to provide a gain adjusting method in a servo control device to suppress changes according to a place where a machine is located. This invention provides a gain adjusting method for a servo control device providing speed control of inputting a difference between speed feedback supplied from a servo motor and a command value to output a torque command, characterized in that after a speed loop gain is increased to detect vibration at each of points moved over a movable range of a machine, the speed loop gain is decreased to detect the gain when the vibration becomes still as a maximum value, thereby providing a set gain value corresponding to a machine.

Abstract: An arc welder comprising: a rectifier circuit 2 which rectifies an alternating current 1 to a direct current; an inverter circuit 3; a transformer 4; a second rectifier circuit 5 which rectifies an output of the transformer 4 to a direct current; and a first reactor 6 which is connected to the second rectifier circuit 5. The arc welder further has a current circuit 10 which is connected in parallel to the second rectifier circuit 5 with a reactance that is larger than the reactance of the first reactor 6.

Abstract: In a servo control apparatus constituted by a converter unit 3 for rectifying an AC power supply voltage to produce a DC power supply voltage, and a plurality of inverter units 5 for producing drive power supply voltages of motors from the DC power supply voltage, the servo control apparatus is provided with a power supply breaker 2 which is connected to the side of the AC power supply of the converter unit 3; and a ground fault detecting circuit 16 built in the converter unit 3. When a ground fault happens to occur, the servo control apparatus stops the operations of all of the inverter units 5 so as to cut off the breaker 2.

Abstract: An absolute encoder comprising a first memory operable to store a first absolute value signal produced every constant time period, the absolute value signal representing an absolute value position. A second memory stores a second absolute value signal produced in a previous time period. A comparing/calculating section compares the first absolute value and the second absolute value and produce a difference amount. A dividing process section divides the difference amount in an equal rate within a producing time period of said first absolute value signal. An interpolated absolute value signal producing section reads the second absolute value signal and adds the difference amount in a stepwise manner.

Abstract: For an interval in which an Op-vector and a b-vector are successively output among intervals of output voltage vectors of each phase within a PWM cycle, the output times of each vector are divided by a positive integer m to find divided times of each vector, and the Op-vector and the b-vector are each alternately output for the divided time, each vector being output m times. For an interval in which an On-vector and an a-vector are successively output, the output times of each vector are divided by a positive integer n to find divided times of each vector, and the On-vector and a-vector are each alternately output for the divided time, each vector being output n times. The adoption of this method enables dispersion of the frequency component of current ripple that arises from PWM pulses (1)-(3).

Abstract: A wafer transferring robot capable of restraining the vibration of wafers during the transfer. The robot comprises a rotating base (2) rotatable on a base (1), two horizontally extensible robot arms (3A, 3B) arranged laterally symmetrically to each other on the rotating base (2) and comprising first arms (32A, 32B), second arms (33A, 33B), and third arms (34A, 34B), respectively, and chucks (4A, 4B), fixed to the third arms (34A, 34B), respectively; wherein the lower surface of the second arm (33B) of one robot arm (3B) is higher than the upper surface of the wafer (WA) held over the third arm (34A) of the other robot arm (3A) via the chuck. Accordingly, the rigidity of transferring parts can be so enhanced that the vibration of wafers (WA, WB) can be prevented.

Abstract: A mounting bed integral with a hammer bank is disposed parallel to a counter balancer composed of a counter balancer constituting member and a yoke. The mounting bed and the yoke are provided with solenoid coils opposed to a permanent magnet provided on the frame, and a pair of bearings are arranged between the mounting bed and the counter balancer constituting member. A position sensor for the mounting bed and the counter balancer is provided. A controller is provided to control a current and direction of the solenoid coil by a detection signal from the position sensor. The mounting bed integral with the hammer bank and the counter balancer are shuttle-operated in opposite directions by the controller.

Abstract: An electromagnetic actuator for a valve stem comprising a stator core having concentratedly wound coils around salient poles and the stator is positioned outside of a tubular member made of a nonmagnetic material. The electromagnetic actuator for a valve stem also has a rotor provided inside the tubular member for driving a threaded operating shaft such that it operats an objective member reciprocally an electromagnetic actuator for a valve stem is further constructed such that permanent magnets, alternately magnetized into a number of pole-pairs, are arranged along the surface of each salient pole of the stator core at a constant pitch, while a number of induction teeth are formed along the circumference of the rotor at a pitch equal to the pitch of the pole-pairs of the permanent magnets. The difference between the total number of the induction teeth and the total number of the polepairs of the permanent magnets is made equal to an even number.

Abstract: There is disclosed a method of controlling a voltage-to-frequency inverter which controls an induction motor by the use of an open-loop system. The motor drives a machine such as a crane, and is braked by a mechanical brake. When the machine is started or stopped, a low-frequency voltage is supplied to the motor so that the motor may produce a torque necessary to hold the load, until the actuation of the mechanical brake ends completely.

Abstract: A method of detecting information on an arc welding position by monitoring the shape and/or position of an welding arc. When in the arc welding along a welding groove position while locating the same, the shape of the arc is picked up from above the joint portion of a member to be welded by means of an image pickup device, and the arc shape picked up is binary-coded. This binary arc shape and/or position are monitored to detect the welding groove position, the height of the welding torch, the welding start point, the welding end point, the external corner point, the internal corner point, the contact point of the welding wire with the work, and the welding groove gap.

Abstract: The present invention relates to an improvement in a method and an apparatus for magnetic levitation of a linear slider through a PI control action. When the slider is horizontally moved while levitated vertically by two fixed magnetic forces, the angle of inclination of the slider cannot be settled in a preset position because of a control delay caused by integral action, which results in an angle offset. In order to eliminate the offset, a signal which is the sum of an angle deviation and a delay compensation signal that is proportional to the product of the velocity of the slider and an integral time is used as an error signal to settle the angle of inclination. The vertical position of the slider is controlled so that the sum of the magnetic forces applied to the slider balances the weight of the slider.

Abstract: The present invention provides a wrist mechanism with three degrees of freedom for an industrial robot, which is compactly formed and to which a tool is mounted. The first degree of freedom is associated with a first input shaft for rotating a wrist portion at a low speed. The second and third degrees of freedom are associated with rotating the tool or tilting the wrist. In order to attain these motions, second and third input shafts concentrically arranged relative to the first input shaft are used for transmitting motion to, through bevel gears, speed reduction mechanisms each symmetrically disposed at right and left sides, and the outputs therefrom are used to drive the tool and wrist.