摘要:
It is an object to provide a winding switching device of a three-phase AC motor having a small size at a low cost in which a time required for switching a winding is shortened and the number of semiconductor switch units is decreased as much as possible. In a winding switching device of a three-phase AC motor including an AC motor in which a winding having each phase is formed by a plurality of windings and a connecting terminal connecting the windings to each other and both terminals of the winding having the phase are provided on an outside of a motor, winding switching means for properly switching the connecting terminal, and a variable frequency power source for supplying a variable voltage having a variable frequency to the AC motor, the winding switching means is constituted by a plurality of three-phase rectifying means connecting one of ends of the winding having the phase to the variable frequency power source and connecting the other end and the connecting terminal to an input terminal on an AC side of the three-phase rectifying means for each phase, and a semiconductor switch provided to open and close both ends on a DC output side of the three-phase rectifying means.
摘要:
A multiple pulse-width modulation power conversion device for variable-speed drive of a three-phase AC motor comprises three units (11 1 , 11 2 , and 11 3 ), each unit including n (n ≧ 2) batteries (12 11 , 12 12 , and 12 13 ), each made up of a DC power supply or at least one battery cell, and n power converters (13 11 , 13 12 , and 13 13 ) for converting the DC power of each of these batteries to single-phase AC power. Single-phase AC terminals within each unit are connected in series, and of the single-phase AC terminals within each unit, one of the single-phase AC terminals that is not connected to the single-phase AC terminal of another power converter is connected to a star connection, and the other is connected to a respective one of three input terminals of a three-phase AC motor. The power conversion device further comprises control circuits (14 11 , 14 12 , ... 14 33 ) for controlling the power converters such that the AC outputs applied to the single-phase AC terminals of the n power converters within each unit are of the same phase, and further, for effecting multiple pulse-width modulation such that the AC outputs from the three units are separated by an electrical angle of 120°.
摘要:
A parallel link mechanism is formed by a lower arm (2) supported on a lower base (1) so that the lower arm (2) can be tilted longitudinally, a connecting link (21) extending in parallel with the lower arm (2) and supported on the lower base (1) so that the connecting link (21) can be tilted longitudinally, and an upper base (22) to which the upper end portions of the lower arm (2) and connecting link (21) are connected pivotably. The upper base (22) supports thereon a swing member (3) adapted to be swung horizontally, and an upper arm (4) provided in a position offset from an axis Z^_ of swinging movement of the swing member (3) so that the upper arm (4) can be tilted vertically. Accordingly, the upper and lower arms do not interfere with each other, and the range of working of the upper arm can be increased.
摘要:
First, second and third compensation signals are generated from the information on the position and speed of the first servo system having a speed control loop as a minor loop. The speed error of the speed control loop of the second servo system which has the speed control loop as a minor loop and uses a signal obtained by sampling the position detection signal, executing a digital calculation process on the sampled signal to obtain a speed signal and integrating the speed signal as a position command signal or a signal obtained by sampling the position detection signal of the first servo system and executing a digital calculation process on the sampled signal as a position command signal is compensated by the first, second and third compensation signals. Thus, even in cases where the acceleration and deceleration of the first servo system are executed even at constant power, positional synchronizing error is not generated. The accurate positional synchronizing control between two servo systems having different response characteristics can be achieved.
摘要:
In order to operate the relative posture between a work (4) gripped by a robot (1) and an arbitrary work point (A) without changing the position of a certain point (P), the work point (A) is defined on the reference coordinates of the robot (1) and when the work (4) gripped by the robot (1) is subjected to a teaching operation with respect to the work point (A), the work point (A) is temporarily controlled as if it were the end effector of a robot control point (R). As the work (4) is rotated around the work point (A), the posture of the work (4) is changed to a desired relative posture with respect to the work point (A). In this manner, the posture of the work (4) gripped by the robot can be changed to a desired relative posture within a short period with respect to the work point (A) and the teaching time can be reduced.