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.
Abstract:
A method of monitoring a discharge machining condition in a set monitor zone while displaying various physical quantities representing the discharge machining condition on one display screen. According to this monitor method, average machining current, average gap voltage, wire tension, acceleration and other physical quantities representing the discharge machining condition are simultaneously displayed on one screen. Further, such physical quantities are sampled in the set monitor zone, and the sampled data are displayed as functions of time on a graph. The discharge machining condition can be known with the passage of time after completion of machining. Therefore, this method is helpful for clarifying and solving machining problems.
Abstract:
This method is to reduce the positional errors by compensating for the delay in the rising torque of servo systems when the change in acceleration by an instruction is great. This control method comprises the steps of pre-smoothing (7) for each loop processing cycle of the position and speed; calculating the feed forward amount FFp on the basis of the pre-smoothed data SMD; and controlling the feed forward by adding the feed forward amount FFp to the speed instruction obtained by the positional loop. In the step of obtaining the feed forward amount FFp, the feed forward amount is calculated by advancing it temporally if the change in acceleration by the instruction is great, hence compensating for the delay in the rising torque.
Abstract:
An injection moulding machine wherein the state of nozzle contact can be easily observed from the outside of a mold clamping unit (10). Monitoring holes (16a, 16b) are provided in a fixed platen (1) of the mold clamping unit (10). The monitoring holes (16a, 16b) are caused to penetrate from at least either of the front and back sides of the mold clamping unit (10) toward a locating hole (12) for locating a sprue bush (31) of a mold. It is possible to provide shutters (22a, 22b) on the monitoring holes (16a, 16b) that are adapted to interlock with a purge shield (20) for opening and/or closing. Furthermore, it is possible to construct the injection moldig machine such that the monitoring holes (16a, 16b) can be used for unobstructed observation via windows (34a, 34b) provided in a purge shield (30).
Abstract:
An industrial robot having a construction wherein the robot includes a structural arm (18) disposed as a structural element on the side portion of a robot drum (12) of a robot machine and a cable handling arm (20) disposed in a double-arm structure. A cable bundle (58) is stored inside a cable storage element (50) of this cable handling arm (20), and the cable storage element (50) itself can be removed from the side portion of the robot drum (12) as a unit element. Power feed cables and transmission cables, that are removably mounted in a unitized structure to the robot machine body, are stored without being exposed to the outside. When breakage of the cables occurs, the disconnected cables can easily be removed from the robot machine body and repaired.
Abstract:
A tool coordinates definition system capable of easily obtaining a transformation matrix for defining a tool coordinates system of a robot. The tool coordinates system (10C) at the 0 DEG position of the robot is rotated around each axis so that the tool coordinates system (10C) becomes parallel to a base coordinates system (10A). A transformation matrix (XO) representing the relation of inclination between the hand coordinates system (10B) and the tool coordinates system (10C) is determined on the basis of an angle of rotation around each axis (P, Q, R) at that time and a matrix [HAND O] representing the attitude of the hand coordinates system at the 0 DEG position. The attitude of the hand coordinates system (10B) at the 0 DEG position can be obtained easily from a design value. An angle of rotation around each axis, too, can be obtained easily from a drawing, etc. Therefore, the transformation matrix (XO) can be easily determined without practically causing the robot (10) to take an attitude so that the tool coordinates system (10C) and the hand coordinates system (10B) become parallel to each other. The tool coordinates system (10C) is defined by the use of the transformation matrix (XO).
Abstract:
A rotor of a synchronous motor according to the present invention includes a plurality of permanent magnets (12) radially disposed around a shaft (10), and a plurality of laminate core members (14) disposed around the shaft (10) to clamp each permanent magnet (12) and serving as magnetic poles. The permanent magnets (12) are extended as a continuous member substantially along the full length of the laminate core members (14). Each laminate core member (14) is separated substantially in the middle by a disc member (24). The disc member (24) includes a shaft hole (26) at the center into which the shaft (10) is fitted, and a plurality of magnet engagement holes (28) around the shaft hole (26). Each magnet engagement hole (28) has a peripheral edge portion (32) having substantially the same profile as the section of the permanent magnet (12) and is formed in substantial alignment with each permanent magnet (12). Accordingly, each permanent magnet (12) is held at a predetermined position in a radial direction by the magnet engagement hole (28) of the disc member (24) against an external direction acting outward relative to the radial direction due to centrifugal force, etc.
Abstract:
An adaptive sliding mode control method which improves convergence of estimation parameters and having excellent damping characteristics. A position error ε between an instruction position and a motor position, a speed error ε, and acceleration Υr of position instruction are determined (S3). A position error εt between the motor position and a mechanical movable portion and its differentiation value εt are determined (S4, S5). A phase plane Suf is obtained by feeding back the position error εt between the motor position and the mechanical movable portion (S7). The estimation values Jhat, Ahat, Grhat of the terms of inertia, kinetic friction coefficient, and gravity are determined (S8), and a switch input τ1 is set to a maximum value Dis(max) or a minimum value Dis(min) of disturbance in accordance with the sign of the phase plane Suf (S10, S11). The torque instruction τ to the motor is determined and is delivered to a current loop (S12, S13). Vibration of the mechanical movable portion is reduced after positioning is completed.