JP2006157996A - Permanent magnet motor and washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce flux leakage of a field permanent magnet as much as possible while ensuring manufacturability and to prevent displacement of the interposing portion of a rotor core. <P>SOLUTION: The rotor core 12 is constructed by laminating a first steel plate where a portion 21 being interposed between a magnet insertion hole 13 and a stator is separated from a main body section 20, and a second steel plate 18 where the opposite ends of the interposing portion 21 in the circumferential direction are coupled with the main body section 20 through a coupling portion 23. A field permanent magnet 14 is inserted into each magnet insertion hole 13 and resin 15 is provided between adjacent interposing portion 21 to cover the opposite ends thereof thus preventing displacement of the interposing portion 21 to the stator side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a permanent magnet motor including a rotor configured by inserting a permanent magnet for a field into a magnet insertion hole of a rotor core, and a washing machine using the permanent magnet motor as a rotational drive source. .

2. Description of the Related Art Conventionally, for example, in an inner rotor type permanent magnet motor, 2n (n is an integer of 1 or more) magnet insertion holes (housing portions) are formed in a rotor core formed by laminating a plurality of steel plates. A rotor is configured by inserting a field permanent magnet into each magnet insertion hole, and a rotor is rotatably disposed inside the stator (for example, Patent Documents). 1).
JP-A-7-99744 (FIGS. 1 to 3)

  However, in the configuration as described in Patent Document 1 described above, in the rotor core, both ends in the circumferential direction of each interposed portion interposed between each magnet insertion hole and the stator are at the center of the rotor core. It is connected to the main part on the side. Since both ends of the interposition part form a magnetic path through which the magnetic flux of the permanent magnet easily passes, there is a disadvantage that the magnetic flux easily leaks from the magnetic path, and the magnetic flux of the permanent magnet cannot be used effectively for the rotation of the rotor. .

  In view of this, it is conceivable to provide a configuration in which both ends of the interposition portion are provided with openings that communicate with the magnet insertion holes and open toward the stator. However, in the case of such a configuration, as the rotor core, each interposition portion is separated and independent from the main body portion on the center side, so it cannot be easily assembled as a rotor and manufactured. There is a problem with sex.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce the magnetic flux leakage of the permanent magnet for the field as much as possible and to ensure the manufacturability. In addition, the displacement of the interposition part of the rotor core is reduced. It is an object of the present invention to provide a permanent magnet motor that can be prevented and a washing machine using the permanent magnet motor.

  In order to achieve the above object, the present invention forms a plurality of magnet insertion holes in a circumferential direction in a rotor core formed by laminating a plurality of steel plates, and uses a field for the magnet insertion holes. In the permanent magnet type motor having a rotor constructed by inserting a permanent magnet, the rotor core has both end portions in the circumferential direction of each interposed portion interposed between the magnet insertion hole and the stator. A first steel plate in which the interposition part is independent from the main part by forming an opening communicating with the magnet insertion hole to the stator side, and at least one end of the interposition part is connected to the main part The second steel plate is laminated, and the interposition portions of the steel plates and the main portions are connected in the laminating direction, and each interposition is interposed between the interposition portions adjacent to each other in the circumferential direction. A resin is provided to cover the circumferential end of each part, and the stator of each interposition part Characterized in that it has a structure that regulates the displacement of the to.

  According to the above-described means, in the rotor core, in the first steel plate portion, the openings are formed at both end portions of the interposition portion, so that the magnetic flux leakage of the field permanent magnet can be reduced. At this time, the interposition part of the first steel plate is independent from the main part, but at least one end of the interposition part of the second steel plate laminated with the first steel plate is connected to the main part, While interposing each interposed part of 1 steel plate with the interposed part of 2nd steel plate, connecting each main part of the 1st steel plate, and main part of the 2nd steel plate, it is the interposed part of the 1st steel plate Can be handled integrally with other parts, ensuring manufacturability and improving manufacturing accuracy.

And since the resin which covers the edge part of the circumferential direction of each interposition part is provided between the interposition parts adjacent to the circumferential direction, and it is set as the composition which controls displacement to the stator side of each interposition part, Displacement to the stator side can be prevented. Along with this, the gap length between the stator and the rotor can be minimized.
The washing machine of the present invention is characterized in that the above-described permanent magnet motor is used as a rotational drive source.

  According to the present invention, the magnetic flux leakage of the field permanent magnet can be reduced as much as possible, and the manufacturability can be secured, and in addition, the displacement of the intervening portion of the rotor core can be prevented.

Hereinafter, an embodiment in which the present invention is applied to an outer rotation type permanent magnet motor will be described with reference to the drawings. First, FIG. 2 shows a broken perspective view of a motor partially broken. This motor is used, for example, in a dehydrating washing machine as a driving motor (rotation drive source) for integrally rotating the agitator at the time of washing and the agitator and the rotating tub at the time of dehydration.
In FIG. 2, the stator 1 is wound around each of the teeth 2, a stator core 3 having a large number of teeth 2 radially, a resin 4 provided by molding so as to cover the stator core 3, and the stator 2. The stator winding 5 is constituted. The stator core 3 is configured to form a ring while laminating a plurality of silicon steel plates. The stator 1 is provided with an attachment portion 6 for attaching it to a predetermined portion of the washing machine for dehydration.

  On the other hand, the rotor 10 has an annular shape disposed on the inner peripheral portion of an annular wall 11a provided on the opening side of the outer peripheral portion of the frame 11 and a magnetic frame 11 having a container shape. A rotor core 12 formed, a number of field permanent magnets 14 inserted into a number of magnet insertion holes 13 provided on the inner peripheral side of the rotor core 12, and the rotor cores 12; The permanent magnet 14 and the frame 11 are made of a molding resin 15 provided by molding so as to be fixed and integrated, and the inner peripheral surface of the rotor core 12 is each tooth of the stator core 3. It arrange | positions so that the front-end | tip part of 2 may oppose through a predetermined space | gap. In this case, a total of 48 permanent magnets 14 are arranged. A rotating shaft (not shown) is attached to the center of the rotor 10.

  The rotor core 12 is configured by connecting a plurality of, for example, six, divided cores 16 divided in the circumferential direction so as to form an annular shape. As shown in FIG. 3, each divided iron core 16 is configured by laminating a first steel plate 17 and a second steel plate 18 each made of a silicon steel plate. Among these, as shown in FIG.4 (b), the 1st steel plate 17 has the main part 20 and the substantially crescent-shaped interposition part 21 isolate | separated with respect to this main part 20 through the magnet insertion hole 13, respectively. The opening part 22 is formed in the both ends of the circumferential direction of each interposition part 21 from these. Each interposition part 21 is a part interposed between the magnet insertion hole 13 and the stator 1. The opening 22 communicates with the magnet insertion hole 13 and opens on the stator 1 side. In the second steel plate 18, as shown in FIG. 4A, the main body 20 and the crescent-shaped interposition part 21 are connected via connection parts 23 at both ends in the circumferential direction of the interposition part 21. .

In this case, as shown in FIG. 3, a plurality of second steel plates 17 are laminated on one second steel plate 18 and one second steel plate 18 is laminated on the top. The main body 20 of each of the steel plates 17 and 18 is connected and fixed in the stacking direction by the caulking portion 24, and the interposition portions 21 are connected and fixed by the caulking portion 25, respectively. One divided iron core 16 has a size having, for example, eight magnet insertion holes 13. Each magnet insertion hole 13 has a long rectangular shape in the circumferential direction, and each permanent magnet 14 inserted into the magnet insertion hole 13 is a neodymium magnet in this case, and has a flat plate shape corresponding to the magnet insertion hole 13. . Moreover, the permanent magnet 14 is magnetized so that the adjacent magnets have opposite poles (see FIG. 1).
As shown in FIG. 1, the resin 15 is provided between the intermediate portions 21 adjacent to each other in the circumferential direction so as to cover the end portions in the circumferential direction of the respective intermediate portions 21, and the magnet insertion holes 13. The resin 15 is filled in the inside and the openings 22.

According to the above configuration, the following operational effects can be obtained.
First, in the divided iron core 16 of the rotor iron core 12, in the portion where the first steel plates 17 are laminated, the opening portions 22 are formed at both ends of the interposition portion 21, and the magnetic resistance increases in that portion. Magnetic flux leakage of the permanent magnet 14 inserted into the insertion hole 13 can be reduced, and the magnetic flux of the permanent magnet 14 can be effectively applied to the stator 1 through the interposition part 21 as much as possible. At this time, the interposition part 21 of the first steel plate 17 is independent of the main body part 20, but the interposition part 21 of the second steel plate 18 arranged above and below has the main body part 20 via both ends at the connecting part 23. And the intermediate portions 21 of the first steel plate 17 are connected to the intermediate portions 21 of the second steel plate 18 by the caulking portions 25 and the main body portions 20 of the first steel plate 17 and the second steel plates. By connecting the 18 main body portions 20 with the caulking portion 24, the interposition portion 20 of the first steel plate 17 can be handled integrally with other portions, ensuring manufacturability and improving manufacturing accuracy. it can.

  And since the resin 15 which covers the edge part of the circumferential direction of each interposition part 21 is provided between the interposition parts 21 adjacent to the circumferential direction, the displacement to the stator 1 side of each interposition part 15 is controlled. Can do. This is particularly effective when there is a portion where the intervening portion 21 is separated from the main portion 20 as in the present embodiment. Accordingly, the gap length between the stator 1 and the rotor 10 can be reduced as much as possible, and the size can be reduced. In addition, since the gap length between the stator 1 and the rotor 10 can be accurately obtained, a motor with less noise and vibration can be manufactured.

  The rotor core 12 is configured by connecting a plurality of divided cores 16 divided in the circumferential direction. Each divided iron core 16 is formed by laminating a plurality of steel plates 17 and 18. By setting it as such a structure, compared with the case where the rotor core 12 is comprised by laminating | stacking the steel plate which makes an annular | circular shape, a steel plate can be used effectively. Incidentally, when using a steel plate having an annular shape, there are many remaining portions and loss is increased, but in the case of the above configuration, the loss of the steel plate can be reduced as much as possible.

The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
In the above-described embodiment, the second steel plate 18 has a configuration in which both end portions of the interposition portion 21 are connected to the main portion 20 via the connecting portion 23, but at least one end portion of the interposition portion 21 is connected to the main portion 20. If it is connected, the other end may not be connected.
The present invention is not limited to the outer rotation type but can be applied to an inner rotation type permanent magnet motor.

The top view of the principal part which shows one Example of this invention Broken perspective view of motor Broken perspective view showing part of rotor core (split core) (A) is a plan view of the second steel plate, (b) is a plan view of the first steel plate.

Explanation of symbols

  In the drawings, 1 is a stator, 10 is a rotor, 12 is a rotor core, 13 is a magnet insertion hole, 14 is a permanent magnet, 15 is a resin, 16 is a split core, 17 is a first steel plate, and 18 is a second steel plate. , 20 is a main part, 21 is an interposition part, 22 is an opening part, 23 is a connection part, 24 and 25 are caulking parts.

Claims (5)

A rotor constituted by forming a plurality of magnet insertion holes in the circumferential direction in a rotor core constituted by laminating a plurality of steel plates, and inserting field permanent magnets into the magnet insertion holes In a permanent magnet motor with
The rotor core is formed with an opening that opens to the stator side in communication with the magnet insertion hole at both ends in the circumferential direction of each interposition part interposed between the magnet insertion hole and the stator. The intermediate portion is laminated with the first steel plate independent of the main portion and the second steel plate with at least one end connected to the main portion of the intermediate portions, and the intermediate portions of each of these steel plates and The main parts are connected to each other in the stacking direction, and a resin is provided between the intermediate parts adjacent to each other in the circumferential direction so as to cover a circumferential end of each intermediate part. A permanent magnet motor characterized in that the displacement to the side is restricted.   2. The permanent magnet motor according to claim 1, wherein each main portion and each interposition portion of the laminated steel plates are connected in the stacking direction by caulking.   3. The permanent magnet motor according to claim 1, wherein the resin is the same material as a molding resin for fixing the rotor core and the permanent magnet. 4.   The permanent magnet motor according to any one of claims 1 to 3, wherein the rotor core is configured by connecting a plurality of divided cores divided in the circumferential direction. 5. A washing machine comprising the permanent magnet motor according to claim 1 as a rotational drive source.

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