Abstract:
A rotor (10) includes a plurality of permanent magnets (14) disposed substantially equidistantly round a shaft (12) and a plurality of laminated core members (16) each being disposed between the permanent magnets (14) and forming a magnetic pole. The laminated core members (16) are formed by laminating and bonding a large number of thin magnetic plate cores (26) and integral type thin cores. The integral type thin core (26) includes a plurality of thin core portions having the same shape and connecting portions (46) for connecting mutually the adjacent thin core portions. When a large number of thin cores (26) and integral type thin cores are integrally joined by a press work, each laminated core member (16) is mutually interconnected between the adjacent laminated core members (16) with a relative arrangement at the time of completion of assembly having installation spaces of the permanent magnets (14), and an integrated type laminate rotor core (48) is formed.
Abstract:
A gap condition detector (3) detects a discharge machining condition of the gap between a tool electrode (1) and a work (2). The difference between this detection value Vg and a target value Vs is multiplied by axial components of a direction vector a &cir& _ in a retreating direction so as to obtain retreat speed command V2x to V2z. These values are added to speed commands V1x to V1z obtained by position loop control to obtain speed commands for speed loop control, and servo-motors (6x to 6z) are driven to regulate the gap described above. The retreat speed commands V2x to V2z are integrated by integrators (10x to 10z) to obtain the displacement of the tool when the speed commands are corrected. This displacement is added to the movement command inputted to the position loop, so as not to lose track of the tool.
Abstract:
In a method for effecting precision laser machining to a work by a laser machining head through additional operation shaft means (8) mounted to a robot body (1) of a multi-joint type laser robot, a required time (A+B) for taking the machining head by rapid feed from an origin point (OR) to a machining start point (E) according to various machining specifications stored in a rewritable storage means and a required time (C) for taking it similarly to the starting point without using rapid feed are calculated and compared with each other by arithmetic means (CPU) provided to a robot controller (10) of the laser robot. Only when the required time (A+B) is shorter than the required time (C), a rapid feed command is given automatically to driving motors (MA, MB) of the additional operation shaft means (8) so that the rapid feed operation of the laser machining head becomes effective to a predetermined laser machining trajectory. In this way, judgement is made automatically and laser machining efficiency can be improved.
Abstract:
A jig (J) has a large number of characteristic points (Pmn) which are disposed at known intervals at grid points of a grid corresponding the coordinate system of a vision sensor, and the characteristic points can be recognized by the sensor. Three or more, but not many, of characteristic points have additional characteristics so that they can be distinguished from the rest of characteristic points by the vision sensor, and the mode of their arrangement or the characteristic points themselves represent the origin and the axes of the coordinate system of the vision sensor. The jig (J) is disposed at a predetermined position and observation is effected through the vision sensor. The origin and axes of the coordinate system are recognized according to the mode of arrangement of the characteristic points or those points themselves, and data required for combining a camera coordinate system with the sensor coordinate system is obtained by using image data of the recognized characteristic points including those having the additional characteristics.
Abstract:
This invention relates to a CNC provided with an autonomous function as one of the constituent elements of an FA system, etc., using a host computer as the primary constituent. A CNC system (2A) comprises a CNC board (21), a PMC board (22) and a communication board (24), and plays the role of a machining cell in the FA system inclusive of a machine tool (23). The PMC board (22) receives a request indicated by the FA computer through a LAN (11) and the communication board (24), and executes suitable processing for the machine tool (23). It sends the processing result back to the FA computer through the communication board (24). Further, the PMC board (22) is provided with instruction means (22A). The instruction means (22A) makes suitable judgement in accordance with the condition of the machine tool (23) on the basis of various data sent from the machine tool (23), and requests suitable processings required to the FA computer, the PLC and other CNC system. The instruction means also makes suitable judgement on the basis of data from units other than itself, and requests necessary processings to the FA computer, the PLC and other CNC system.
Abstract:
A water-tight structure of a simple construction which has a high waterproofing effect and a low sliding resistance, and which is provided between a lower arm of and a processing liquid tank for an immersion wire electric discharge machine. First and second water-tight structures are provided between a wall (24) of a processing liquid tank (23) through which a lower arm (22) is passed and the lower arm (22). The first water-tight structure is provided with a slide plate (27) moving slidingly along with the lower arm (22), and the second water-tight structure is provided with an oil seal (29) which is provided at the portion of the slide plate through which the lower arm (22) passes, and which contacts the outer circumferential surface of the lower arm (22).
Abstract:
A variable reluctance motor is driven by a circuit comprising a common switching element, and switching elements which correspond to the phases. The total value (total current it) of the currents flowing through the phase coils is found. In accordance with the difference between the total value and a current command icmd, and its sign (positive or negative), the duty ratio of the PWM signal for turning the common switching element on and off is calculated. Further, based on which phase is excited according to the electrical angle of the rotor, and on the sign of the difference, the turn on/off of the switching element corresponding to each phase is controlled. In this way, a current loop is controlled to permit the detected total current it to follow up the current command icmd. Therefore, even when the excited phases are switched over, the current is always controlled to suppress the torque ripple.
Abstract:
A cage rotor (10) comprises a laminated core (14) fixed to a rotor shaft (12); a secondary conductor (18) arranged in a plurality of through holes (16) made through the laminated core (14); a pair of end rings (20) connected to the secondary conductor (18) at both ends of the laminated core (14) in the axial direction; and a pair of reinforcing members (22 and 23) covering the end rings (20) respectively. The secondary conductor (18) and end rings (20) are integrally formed by casting, and connected to the laminated core (14) and reinforcing members (22 and 23). The reinforcing members (22 and 23) are made up of annular elements made of a highly rigid material, and are provided with the cylindrical walls (26 and 27) enclosing the cylindrical outer periphery of the end rings (20), and the multi-hole walls (28 and 29) sandwiched between the respective end rings (20) and the laminated core and having a plurality of holes (32) communicating with the through holes (16) of the laminated core (14), and end walls (30 and 31) which contact with the outer ends of the end rings (20) in the axial direction.
Abstract:
A high-output induction motor having its stator and rotor elongated without affecting grinding and die-casting while maintaining the flexural rigidity of the articles. The induction motor (10) includes two rotor cores (14) fixed to a spindle with a predetermined gap in an axial direction and two stator cores (24) encompassing the rotor cores (14) and fixed to a sleeve portion (22) of housing means (20). Each rotor core (14) includes a plurality of secondary conductors (36) extending in the axial direction and a pair of end rings (38) connecting each secondary conductor (36) at both ends of the rotor core (14) in the axial direction. Each stator core (24) includes a plurality of windings (26). These rotor cores (14) and stator cores (24) are shaped longer to such an extent that die-casting and grinding are not affected and the flexural rigidity of the articles is maintained.
Abstract:
A laser machining apparatus adapted to apply a laser beam to a work and cut the same. The cutting of a work of a nonferrous metal is done efficiently and stably, and the cutting of even a work of a large thickness is also done. In a point A, a boring process is carried out under a machining condition A to form an arcuate portion (31). The machining condition is then switched to B, and an expansion treatment is carried out to form an expanded bore (32) in an extended form of the original arcuate portion (31). When the expansion treatment has completed in the position B, the stand-off (distance between the front end of a machining nozzle and the surface of the work) is set to a lowest possible level, and the machining condition is switched to C, under which a cutting process is started. Therefore, the cutting process is carried out in substantially the same manner as in a process in which the cutting of a work is started directly from the outer side of an end portion thereof. During the cutting process, the pressure of an assist gas is set high, and the stand-off small, so that the dross scattering effect by the assist gas is displayed more remarkably. Accordingly, a cutting process can be carried out efficiently and stably.