JPS6317211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating rotating electromagnet.

Conventionally, as this type of rotating electromagnet, there is a cylindrical iron core 10 formed by laminating thin iron plates as shown in FIGS. 3a and 3b.
A stator S has an exciting coil 12 wound around a salient pole 11 provided facing the inner circumferential surface of the stator S so that the salient poles 11 are mutually excited to different magnetic poles, and a cylindrical permanent magnet magnetized in the diametrical direction. The magnet 13 consists of a rotor R inserted into the center of the output shaft 4, and the permanent magnet 13
There is one in which the rotor R is inserted into the rotatable bearing 7 while being inserted into the stator S, and the excitation coil 1
By passing current through 2, both salient poles 1 of the stator S
1 are excited to have different magnetic poles, and both magnetic poles of the permanent magnets 13 of the rotor R are each attracted to the salient poles 11, so that the rotor R rotates, and the direction of rotation of the rotor R is determined by the current flowing through the excitation coil 12. It was possible to select depending on the direction. However, in such a conventional example, an iron core 10 with a complicated shape is required, and the work of winding the excitation coil 12 around the salient pole 11 is troublesome, which complicates the manufacturing process and increases costs. It had its drawbacks. In addition, in order to change the operating angle, it is necessary to change the iron core shape of the stator S, and since the operating angle cannot be easily changed, the operating angle has been set appropriately using a stopper 14. At times, impact is applied to the stopper 14, shortening its mechanical life, and it also has the disadvantage of causing howling at a stable position. On the other hand, with small rotating electromagnets, it is difficult to process the iron core and wind the excitation coil, so the stator S was constructed using a coreless excitation coil. Since the magnetic flux density between the output shafts 12 and 12 is greatly reduced, and the attraction force of the rotor R by the stator S is reduced, the rotational torque of the output shaft 4 is reduced, resulting in poor output efficiency. The present invention aims to solve the above-mentioned drawbacks.

Examples will be described below using figures. 1st
Figures 1 and 2 show an embodiment of the present invention, in which cylindrical permanent magnets 1a and 1b, whose inner circumferences are alternately magnetized with different magnetic poles, are attached to both ends of a cylindrical case 3 made of a magnetic material. The stator S is formed by fitting and arranging the cylindrical excitation coil 2 between both permanent magnets 1a and 1b with their centers coincident, and the cylindrical case 3
A cylindrical iron core 5 inserted and fixed to an output shaft 4 rotatably inserted through the center of the excitation coil 2 is inserted into the excitation coil 2, and both permanent magnets 1a, 1 are inserted from both ends of the iron core 5, respectively.
The rotor R is formed by protruding magnetic pole pieces 6a and 6b facing each other at an appropriate distance from each of the same magnetic pole faces on the inner circumferential surface of the rotor b. In the figure, 7 is a bearing made of an oil-impregnated alloy or a ball bearing, and 8 is a thrust washer for smoothing the rotation of the rotor R, which is made of a lubricating non-magnetic material. As the cylindrical permanent magnets 1a and 1b, sintered ferrite molded products or band-shaped rubber magnets formed into an annular shape may be used. Different magnetic poles are formed alternately at four locations on the inner circumferential surface by magnetizing adjacent magnetized locations in opposite directions, but the number of magnetized locations is limited to four locations. The number of magnetic pole pieces 6a, 6b corresponds to the same magnetic pole surface of the permanent magnets 1a, 1b, so the number of magnetic pole pieces 6a, 6b is 1/2 of the number of magnetized positions.

The operation of the embodiment will be explained below. Since the present embodiment has a symmetrical structure, the operation of the left side part will be explained. When no current flows through the excitation coil 2, the iron core 5 is not magnetized and the pole magnet protruding from the end of the iron core 5. The piece 6a acts as a mere magnetic piece, and the magnetic pole piece 6a is located at the position where the magnetic resistance between the different magnetic poles on the inner peripheral surface of the permanent magnet 1a is the smallest, that is, between the different magnetic poles, as shown in FIG. 2a. Stable in the center. Next, when current flows through the excitation coil 2 so that the end of the iron core 5 near the permanent magnet 1a becomes the north pole, both magnetic pole pieces 6a become the north pole, and both magnetic pole pieces 6a become the south pole of the permanent magnet 1a. is attracted by the magnet, rotates approximately 45 degrees in the direction of arrow A, and stabilizes at the position shown in FIG.
It becomes a pole and is attracted to the N pole of the permanent magnet 1a, and the arrow B
It is designed to rotate approximately 45 degrees in the direction of , and stabilize at the position shown in FIG. 2c. Note that if the current flowing through the excitation coil 2 is suddenly cut off, the rotor R will self-return to the position shown in Fig. 2a, but even if a spiral spring or the like is used to ensure self-return. good. Incidentally, the same operation as described above is performed on the right side portion of the excitation coil 2, and the rotational torque generated in both portions from the output shaft 4 is obtained by adding them together. Note that by appropriately changing the shape and arrangement of the left and right permanent magnets 1a, 1b and the magnetic pole pieces 6a, 6b, rotating electromagnets with various output characteristics can be obtained.

As described above, the present invention forms a stator with cylindrical permanent magnets that are fitted into both ends of a cylindrical case made of a magnetic material and have different magnetic poles alternately magnetized on the inner circumferential surface. A rotor is formed by inserting a cylindrical iron core with protruding magnetic pole pieces facing the same magnetic pole on the inner peripheral surface of the magnet at appropriate intervals into a cylindrical excitation coil installed between both permanent magnets. The iron core has a simple shape, and since a coreless coil is used as the excitation coil, there is no need to wind the excitation coil as in the conventional case, and it has the advantage of being easy to manufacture. Ori,
In addition, by appropriately setting the magnetized point of the permanent magnet, any operating angle can be obtained during reciprocating rotation, and unlike conventional examples, there is no need for a stopper to set the operating angle, resulting in a simpler structure. At the same time, problems such as shortening of mechanical life and occurrence of howling due to the provision of the stopper do not occur. In addition, since rotational torque is obtained by magnetic pole pieces protruding from both ends of the iron core and permanent magnets inserted into both ends of the cylindrical case, it has the advantage of improved output efficiency. be.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 a~
3c is an explanatory diagram of the operation shown in a sectional view taken along the line X--X of FIG. 1, FIG. 3a is a sectional view of the conventional example, and FIG. 3b is a sectional view taken along the Y-Y line of the same. 1a and 1b are permanent magnets, 2 is an exciting coil, 3 is a cylindrical case, 4 is an output shaft, 5 is an iron core, 6a, 6b
is a magnetic pole piece.

Claims (1)

[Claims] 1 Cylindrical permanent magnets with different magnetic poles alternately magnetized on the inner circumferential surface are inserted into both ends of a cylindrical case made of a magnetic material, and a cylindrical excitation coil is arranged between both permanent magnets with their centers aligned. A cylindrical iron core inserted and fixed to an output shaft rotatably inserted through the center of a cylindrical case is inserted into the excitation coil, and the inner peripheral surfaces of both permanent magnets are A rotating electromagnet characterized by having opposing magnetic pole pieces protruding from the magnetic pole face at an appropriate interval.