KR200265987Y1 - Structure of induction ac servo motor - Google Patents

Abstract

The present invention relates to a structure of an induction AC servomotor which can be applied to industrial equipment including a robot arm by miniaturization and high efficiency by changing the structure into a flat plate type using two stators.

Magnetic pole magnets having different phases are disposed on the upper and lower surfaces of the rotor coupled to the shaft, and stators are disposed at predetermined distances from the upper and lower sides of the rotor in the direction of the shaft, respectively. A position detector (encoder) for detecting the position of the magnetic pole of the magnetic pole magnet is coupled to a predetermined position of the.

The present invention can improve the performance by increasing the induced electromotive force generated by increasing the amount of winding by arranging two stators so as to face the upper and lower sides of the rotor, forming a large number of phases on the rotor and the stator, and the interval of 90 degrees By allowing the images to face each other, the width is reduced and the position control is precisely performed.

Description

Induction AC Servo Motor Structure {STRUCTURE OF INDUCTION AC SERVO MOTOR}

The present invention relates to the structure of an induction AC servomotor. More specifically, the induction alternating current servo which can be applied to industrial equipment including a robot arm by miniaturization and high efficiency by changing the structure into a flat plate type using two stators. It relates to the structure of the motor.

In general, an induction motor is a kind of alternating current (AC) motor belonging to a rotating magnetic field type, the driving principle of which is obtained by the interaction of the rotating magnetic field generated in the stator and the induction magnetic field generated in the rotor portion. In addition to single phase, there are three-phase induction conductors, three-phase winding type dudo motors, and the like.

The induction motor is one of the most easy-to-use motors among AC motors, and is widely used in general household electrical appliances. The induction motor rotates at a speed corresponding to the load, but there is some constant speed. Therefore, it is often used as a power motor that does not require constant speed. There are many types of induction motors, but among them, single-phase condenser motors are the most popular.

The characteristics of the induction motor will be briefly described as follows: "1) It is suitable for AC power motors. 2) The structure is simple and robust. 3) There is a certain static speed. 4) It has a drooping characteristic. 5) Long service life 6) Low price 7) The efficiency at light load is generally low. ”

1 is a cross-sectional view showing the structure of a servomotor to which the prior art is applied.

Referring to FIG. 1, reference numeral 10 denotes a rotor, a cylindrical shaft 11, a rotor core 12 coupled to the shaft 11, and the rotor core 12. It includes a magnetic pole 13 formed along the outer peripheral surface of the. In addition, reference numeral 20 denotes a stator, which includes a stator core 21 arranged to surround the magnetic pole magnet 13 while being spaced apart from each other by a predetermined distance, and an armature winding 22 wound around the stator core 21. And a lead wire 23 for supplying power to the armature winding 22.

In addition, reference numeral 30 denotes a position detector (encoder), a rotating disk 31 having a plurality of slits for detecting the position of the magnetic pole, and the light emitting element 32 disposed to be spaced apart from the rotating disk 31 by a predetermined distance. ) And a light receiving element 33 facing the light emitting element 32 with the rotating disk 31 interposed therebetween.

Referring to the operation of the servo motor having the above configuration is as follows.

In the servomotor, a three-phase winding is used, and the current of each phase is driven by passing an alternating current of a square sine wave. In the accompanying drawings, (a) and (b) are cross-sectional views of a three-phase servomotor, and U +, U-, V +, V-, W +, and W- are ends of each winding.

When the three-phase AC sine wave as shown in FIG. 2 (c) is energized to the servomotor, when the servo motor is viewed at the time A point, only the U phase is positive, and both the V and W phases are negative. (-)to be. Therefore, the current direction of each winding is as shown in (a) of FIG. 2, and the composite vector of the magnetic flux induced by the current occurs in the direction from N to S. At this time, if there is a magnetic field of the rotor at a position intersecting the magnetic flux at a right angle, a torque for turning the rotor clockwise is generated by the repulsive force and the attraction force between the magnets.

In addition, when the time B point is examined in the same way, the magnetic flux by the winding | winding generate | occur | produces in the position which shifted 60 degrees to the rotation direction like FIG.2 (b). In this way, a continuous rotating magnetic field can be obtained by flowing a three-phase alternating current, that is, a sine wave or a square wave current through the stator winding. If the driving current phase can be matched at right angles to the rotation angle of the rotor, it is possible to construct an efficient servomotor with smooth torque.

On the other hand, in order to orthogonally cross the direction of the current and the direction of the magnetic flux in the servo motor as described above, it is necessary to accurately determine the position of the magnet. 3 shows a rotating disk of an incremental encoder in which a dedicated slit for sensing a magnetic pole position is added to an inner circumference of a conventional incremental encoder. The magnetic pole detection signals U, V, and W channel signals each have a phase difference shifted by 120 degrees with respect to the number of poles of the AC servomotor. Accordingly, the number of detection signals is six signals in which the U, V, and W channels are combined in addition to the conventional A, B, and Z channels. It outputs it to the line driver to enable transmission and detects the position.

As a result, in the AC servomotor to which the prior art is applied as described above, the winding amount must be increased in order to achieve a desired performance. Accordingly, since the miniaturization of the servomotor becomes difficult, a large amount of space is required when applying to industrial equipment. As a result, a problem arises in that the size of an industrial device increases.

In addition, when the winding amount is reduced for miniaturization, the induced electromotive force is lowered, resulting in a problem of deterioration in performance.

The present invention has been made to solve the problems of the prior art as described above, the purpose is to improve the performance by increasing the induced electromotive force generated by increasing the amount of winding by placing two stators so as to face the upper and lower sides of the rotor To provide the structure of the induction AC servomotor.

In addition, another object of the present invention is to form 16 phases on the rotor, 12 phases on each of the stator so that the phases facing each other at an interval of 90 degrees to the induction AC servo to precisely control the position To provide the structure of the motor.

In addition, another object of the present invention is to provide a structure of an induction AC servomotor that can be miniaturized by forming a flat plate shape and at the same time high speed rotation and high torque precision position control.

1 is a cross-sectional view showing the structure of a servomotor according to the prior art.

2 is a view for explaining the operation principle of the servomotor according to the prior art.

3 is a view showing the shape of a rotating disk for position detection in the servomotor according to the prior art.

4 is a cross-sectional view showing the structure of an induction servomotor according to the present invention.

5 is a perspective view showing a rotor applied to the servomotor according to the present invention.

Figure 6 is a perspective view showing a stator applied to the servomotor according to the present invention.

<Description of Symbols for Main Parts of Drawings>

110: rotor 111: shaft

112: aluminum 120: stator

121: coil 130: position detector (encoder)

According to a feature of the present invention for achieving the above object, a magnetic pole magnet having a phase is arranged on the upper and lower surfaces of the rotor coupled to the shaft (shaft), the upper and lower sides of the rotor in the direction of the shaft A stator is disposed spaced apart from each other by a predetermined distance, and a structure of an induction alternating current servomotor is coupled to a position detector (encoder) for detecting a rotation speed and a position at a predetermined position of the shaft.

At this time, according to an additional feature of the present invention, it is preferable that the upper and lower surfaces of the magnetic pole formed on the upper and lower surfaces of the rotor is formed in a zigzag shape.

In addition, according to another additional feature of the present invention, it is preferable that 16 phases are formed on the rotor, and 12 phases are formed on the stator, respectively, so that phases opposed to each other by 90 degrees are present.

In addition, according to another additional feature of the present invention, it is preferable that the phase is distinguished by diecasting aluminum in the rotor.

In addition, according to another additional feature of the present invention, it is preferable that the rotor and the stator form a core by laminating donut-type iron pieces having different diameters from the center in the radial direction.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a cross-sectional view showing the structure of the induction servomotor according to the present invention, Figure 5 is a perspective view showing a rotor applied to the servomotor according to the present invention, Figure 6 is a stator applied to the servomotor according to the present invention It is a perspective view showing.

4 to 6, reference numeral 110 denotes a rotor, 120 denotes a stator, and 130 denotes a position detector.

In the above, the rotor 110 is coupled to the shaft (shaft) 111 to transmit the rotational power to the outside. In addition, the stator 120 is fixed to an outer case, and a protrusion 122 for winding the coil 121 in a direction opposite to the rotor 110 is formed along the outer circumferential surface thereof. In addition, the position detector 130 is made of a conventional configuration that is the same as or similar to the prior art.

As a result, in the present invention, one rotor 110 and two stators 120 are coupled to each other, and the stator is spaced apart a predetermined distance from the upper and lower sides of the rotor 110 in the direction of the shaft 111. 120 is disposed.

At this time, the rotor 110 and the stator 120 is a donut-type iron pieces of different diameters are laminated in the radial direction from the center to form an iron core, rolled the plate member for convenience of work, the rotor The 110 may be fixed by diecasting the aluminum 112 for phase separation, and the stator 120 may be fixed by winding the coil 121.

On the other hand, the phase in the magnetic pole magnets formed on the upper and lower surfaces of the rotor 110 is formed in a zigzag shape of the upper and lower surfaces by the aluminum 112 for phase separation, the aluminum 112 to ensure a sufficient space of each phase In order to die inside the rotor 110 to be bent.

In addition, sixteen images are formed on the rotor 110, and twelve images are formed on the stator 120, and the two images are opposed to each other at intervals of 90 degrees.

As a result, the induction AC servomotor to which the present invention having the above structure is applied is precisely positioned due to many phases, and the desired performance can be achieved even with a small amount of cores. In addition, by using the two stator 120 it is possible to increase the amount of winding of the coil 121 is wound around it to improve the performance by increasing the induced electromotive force.

Although the present invention has been shown and described in connection with specific embodiments, it is common knowledge in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended utility model claims. Anyone who has a can easily know.

Applying the structure of the induction AC servomotor of the present invention as described above, by placing two stators so as to face the upper and lower sides of the rotor, the effect can be improved by increasing the induced electromotive force generated by increasing the amount of winding There is.

In addition, the present invention has the effect that the position control is made precisely by forming a large number of images on the rotor and the stator, so that there is an image facing each other at intervals of 90 degrees.

In addition, the present invention has the effect of high speed rotation and precise control at the same time can be achieved by placing the two stators so as to face the upper and lower sides of the rotor to form a flat flat shape as a whole.

Claims (5)

Magnetic pole magnets having different phases are disposed on the upper and lower surfaces of the rotor coupled to the shaft, and stators are disposed at predetermined distances from the upper and lower sides of the rotor in the direction of the shaft, respectively. A structure of an induction AC servomotor, characterized in that a position detector (encoder) for detecting the position of the magnetic pole of the magnetic pole magnet is coupled to a predetermined position of the magnetic pole. The method of claim 1, The upper and lower phases of the magnetic pole magnets formed on the upper and lower surfaces of the rotor are formed in a zigzag shape. The method of claim 1, 16 phases are formed on the rotor, and 12 phases are formed on the stator, respectively, so that there are phases opposed to each other by 90 degrees. The method of claim 1, In the rotor structure of the induction AC servo motor, characterized in that the phase is distinguished by diecasting (diecasting) aluminum. The method of claim 1, The rotor and the stator structure of the induction AC servo motor, characterized in that the donut-type iron pieces of different diameters are laminated in the radial direction from the center to form an iron core.