JPS6166549A - Formation of skew for stator core of servo-motor - Google Patents

Abstract

PURPOSE:To provide a skew ring exactly and efficiently for a stator core with the both ends held, by providing the skew ring for the core in a state that desired coils are provide for the temporarily laminated stator core. CONSTITUTION:In the figure, so far as a stator core 10 is concerned, the specified laminated sheets are arranged to be temporarily laminated in required quantity and to be finally fixed together. When the temporarily laminated stator core 10 is completed to be provided with coils 11, then jigs 13 are provided for the both ends of the stator core 10 for going through the industrial procedure of a skew ring. When each jig 13 is twisted mutually in the opposite direction in a state of such provided jigs, then the stator core 10 is twisted by one or half a slot, and the desired skew is formed uniformly around the axis of the slots 15 provided with salient poles 14 and the coils 11.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a method for skewing a stator core of a servo motor for twisting the stator core of a brushless DC servo motor at a predetermined angle to give a skew ring to the core. Regarding the formation method.

"Prior Art" This type of brushless DC servo motor basically consists of a large number of laminated plates 3 in which a required number of slots 1 and salient poles 2 are formed according to the number of poles, as shown in Fig. 3. Then, the coils 5 are pushed into each slot 1 according to the winding method, while the rotating shaft 6 is
It has a structure in which a rotor 9 is rotatably disposed in a stator core 4, which is made by joining permanent magnets 8, which are formed into a predetermined number of segments in the longitudinal direction of the outer periphery of a cylindrical ferrite 7, at equal intervals. . In such a servo motor, each salient pole 2 and the permanent magnet 8 are generally arranged in parallel with each other with a required gap in the axial direction.

"Problems to be resolved by the invention" In the servo motor having the above structure, if the salient poles 2 and the permanent magnets 8 are simply arranged in parallel in the axial direction at the required intervals, the permanent The distortion of the magnetic field by the magnet 8 generates harmonic components, increases magnetic loss, and impedes motor characteristics. A particular problem with this kind of characteristic deterioration is uneven rotation in the low speed region, the so-called cogging phenomenon.
This poses a major problem in practice, and must be solved in order to improve the wide-area characteristics.

As a solution to this problem, it is effective to give a so-called skew by twisting either one of the salient poles 2 of the stator core 4 or the permanent magnets 8 of the rotor 9 so that they are shifted by, for example, half a slot or one slot in the axial direction. It is known that In this case, in the method of giving skew to the stator coil 14 in advance, each slot 1 has a coil 5.
As a means of inserting the wire, it is necessary to rely on manual winding, but this method has the disadvantage that it causes variations in the winding resistance and impairs the motor characteristics. On the other hand, in order to form a skew with respect to the rotor 9, it is necessary to twist the permanent magnet 8 at a required angle, but since the permanent magnet 8 is generally composed of a sintered magnet, its workability is is extremely low, and therefore the formation of skew as described above is difficult to expect.

"Means for Solving the Problems" In view of the above circumstances, the present invention first attaches required coils to the provisionally laminated stake core, and then attaches the stator core to the end of the stator core with the coil attached. The servo is held in an appropriate jig and twisted along the axial direction at a required angle to perform the skewing process, and then the stacked stator cores are finally joined and fixed by welding etc. A method for forming a skew in a stator core of a motor is provided.

"Function" According to the above-mentioned skewing method of the present invention, the stator core with the coils attached is in a temporarily laminated state, so the skinnying process performed by holding the re-ends of the core can be carried out accurately and with high efficiency. In addition, it is possible to automate the process of attaching the coil to the stator core in the same manner as in the past, and to simultaneously achieve high characteristics and low cost of the servo motor using simple means.

"Embodiment" Figure 1 is for conceptually explaining a method of forming a skew in the stator core of a servo motor according to an embodiment of the present invention. coil 1
1 shows the stator core 1 automatically inserted with a coil inserter (not shown), and the stator core 1 at this stage.
0 is a state in which a predetermined number of laminated plates are temporarily laminated, and the laminated plates of this 110 are before the final fixed state. When each coil 11 is automatically inserted by the coil inserter, insulating paper is also automatically inserted into each slot to insulate each coil 11 from the stator core 10.

When the process of inserting the coil 11 into the stator turf 110 temporarily laminated as described above is completed, the stator turf 1
A jig A13 is attached to the end portion of 10 and subjected to a skewing process. In that case, in a structure in which a groove-shaped matching mark 12 is formed on the stator core 10, this matching mark 1
It is preferable that the chuck of the jig 13 is made to engage the chuck of the jig 13.

When the jigs 18 are bent in opposite directions to a desired angle as shown by the arrows in the figure, with the jigs 13 mounted in this manner,
The stator core 10 is twisted along its axis by, for example, half a slot or one slot as shown in FIG. be formed.

Such skinny ring forming processing is performed with the coils 11 inserted into each slot 15 in advance, so by twisting the jigs 13 attached to the respective ends of the stator core 10 in mutually opposite directions, It is possible to apply skinny uniformly with high precision and efficiency. At the stage where the stator core 10 is skinny-ringed, the laminated plates of the stator core 110 are finally bonded and fixed by appropriate means such as welding their outer peripheral surfaces, completing the stator production. You can get it.

"Effects of the Invention" According to the present invention, as explained above, since skewing is imparted to the provisionally laminated stator core with the required coils attached to the core, the formed skew is uniform and It will be accurate. In addition, such a skew ring processing process is easy to perform simply and with high efficiency, and in combination with the coil installation process at the stage before skimming, the skew forming method of the present invention can reduce the cost of products. It contributes comprehensively.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the installation of a jig for imparting skewing to a stator core with coils attached according to the present invention. Fig. 2 is a partial cross-sectional explanatory diagram showing a state in which the required skew has been formed in the stator core using the jig shown in Fig. 1, and Fig. 3 is a conceptual view of the conventional arrangement of the stator core and the stator. FIG. 10... Stator core 11... Stator coil 12... Dowel mark 13... Jig 14... Salient pole 15... Slot Figure 1 Figure 2

Claims (1)

[Claims] After installing the required coils under insulation on the temporarily laminated stator core of the servo motor, the stator core is twisted at a predetermined angle along the axis while holding the end of the stator core to perform the skewing process. 1. A method for forming a skew in a stator core of a servo motor, the method comprising: forming a skew in a stator core of a servo motor;