JP3517319B2 - Synchronous motor rotor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a synchronous motor, and more particularly to a rotor made of a high magnetic permeability material and having a plurality of slits formed from magnetic pole positions in the circumferential direction to adjacent magnetic pole positions. Regarding the improvement of.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing a four-pole rotor of a conventional synchronous motor. This rotor has a rotor piece 101 formed by pressing a disk-shaped high magnetic permeability material,
It is made by laminating and fixing multiple sheets in the direction of the rotation axis. By forming a plurality of slits typified by the slits 103 symmetrically with respect to the two diameter lines 102 of the rotor element 101 orthogonal to each other, a plurality of magnetic paths typified by the magnetic path 104 are formed. To generate a magnetic resistance distribution in the circumferential direction of the rotor. The low magnetic resistance portion gathered in the rotor circumferential portion near the diameter line 102 has four magnetic poles 10.
And rotating about the axis of rotation in the rotating magnetic field. At this time, the adjacent magnetic paths are separated from each other, and the magnetic resistance difference between the magnetic poles is larger in the magnetically insulated state, so the torque generated by the motor is improved. Like the magnetic path 104 and the magnetic path 106, the magnetic paths to be formed are connected to each other by providing a connecting portion 107 at a small part of the outer peripheral portion of the rotor.

[0003]

In the rotor of the synchronous motor described in the prior art, the magnetic path is formed by arranging the slit so as to extend from the magnetic pole to the magnetic pole. It is only joined at a small part of the outer circumference of the rotor. Therefore, when such a rotor is rotated at a high speed, the centrifugal force applied to the magnetic paths causes stress concentration in the magnetic path-to-magnetic-connection joints, which breaks the joints and damages the rotor. There was a problem. In order to simply solve this problem, it is sufficient to thicken the coupling part that couples the magnetic paths to each other or to increase the number of coupling parts. Since it becomes larger and the magnetic resistance difference between the magnetic poles becomes smaller, the motor-generated torque decreases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotor for a synchronous motor which has a simple structure to fix a magnetic path and which is not damaged even when rotated at a high speed.

[0005]

In order to achieve the above object, the present invention comprises a plurality of slits which are made of a material having a high magnetic permeability and which extend from a magnetic pole position in the circumferential direction to an adjacent magnetic pole position. A rotor of a synchronous motor having a plurality of magnetic paths includes a non-magnetic member filled in the plurality of slits, and end rings integrally formed with the non-magnetic member on both end faces of the rotor.

According to the present invention, the centrifugal force generated when the rotor is rotated causes each magnetic path to pop out in the circumferential direction. Since the end ring is fixed by a non-magnetic structure integrally molded, the rotor will not be damaged even at high speed rotation.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing the overall structure of a four-pole rotor according to the first embodiment of the present invention. FIG. 2 is a view showing the shape of the rotor element 10 of the rotor shown in FIG. The rotor piece 10 has circumferential magnetic pole positions 11 to 12, magnetic pole positions 12 to 13, magnetic pole positions 13 to 14, and magnetic pole positions 14.
A plurality of slits typified by the slits 15 are formed in the direction from No. 11 to 11, and a plurality of magnetic paths typified by the magnetic path 16 are formed. The filling member filling the inside of each slit of the rotor piece 10 laminated in the rotational axis direction and the end rings 17 on both end surfaces of the rotor are integrally molded by a non-magnetic member. In the present embodiment, it is preferable to use aluminum or resin for the non-magnetic member. As described above, a plurality of rotor pieces 1
This rotor assembly is fitted into a predetermined mold in a state that 0 is laminated by aligning each slit. And
A desired non-magnetic member, for example, the above-mentioned aluminum or resin is poured in a molten state into this mold, and is solidified in the mold so that the non-magnetic member is provided between the mold and both end surfaces of the rotor. The end ring portion and each slit are filled, and the slit filling member and the end ring 17 are integrally molded to form a non-magnetic structure. Therefore, this non-magnetic structure firmly joins together the rotor assembly consisting of the laminated rotor pieces 10 and has sufficient mechanical strength to withstand the centrifugal force applied to the rotor during high-speed rotation. .

When the rotor rotates, each magnetic path receives a centrifugal force and tries to jump out in the circumferential direction. However, the filling member filled in each slit and the end rings 17 on both end faces of the rotor are made into a non-magnetic member. Since it is integrally molded, the magnetic path that tries to pop out can be fixed, and the rotor will not be damaged even at high speeds. The maximum rotation speed of the rotor according to the first embodiment is
The structure of the non-magnetic member filled in each slit has a rotational speed that can withstand the centrifugal force received from the magnetic path. It should be noted that as the length of the rotor in the rotation axis direction increases, the mass of the rotor assembly increases, and thus the centrifugal force applied to the magnetic path increases, and conversely, the structure of the non-magnetic member filled in each slit is formed. In general, the desired maximum rotor speed limits the length of the rotor in the rotational axis direction.

FIG. 3 is a diagram showing a second embodiment of the present invention. The second embodiment is formed by arranging a plurality of rotors shown in the first embodiment in the rotation axis direction.

The length of the rotor in the direction of the rotation axis is determined by the number of rotations of the rotor, as described above. For this reason, the second embodiment is characterized in that a plurality of rotors shown in the first embodiment are arranged in the rotation axis direction to have a desired rotor length. As with the first embodiment, the rotor of the second embodiment is not damaged even at high speed rotation.

FIG. 4 is a diagram showing a third embodiment of the present invention. A plurality of rotor pieces 10 shown in FIG. 2 are laminated in the rotational axis direction to form a rotor block 20, and a plurality of rotor blocks 20 are arranged with a constant gap. The filling member filling the inside of each slit and the filling member 21 filling the gap between the rotor blocks are integrally molded with the end rings 17 on both end faces of the rotor by a non-magnetic member. Also in the third embodiment, as described above, the plurality of rotor blocks 20 arranged at regular intervals are fitted into a predetermined mold, and by injecting aluminum or resin in a molten state into the mold, The above-mentioned slits, gaps, and end rings 17 are integrally molded with a nonmagnetic material to form a single nonmagnetic structure. According to this embodiment, each rotor block 20 is partitioned by the filling member 21 filled in the gap provided in each gap, and even if the overall axial length is increased, each rotor block 20 is individually separated. It possesses mechanical strength to withstand high speed rotation.

Similar to the rotor shown in the second embodiment, a desired rotor length can be obtained by arranging a plurality of rotor blocks 20. As with the motors of the first and second embodiments, the motor of the third embodiment does not damage the rotor even at high speed rotation.

FIG. 5 is a diagram showing a fourth embodiment of the present invention. In this embodiment, the filling member filled in each slit of the rotor element 10 laminated in the rotation axis direction, the end rings 17 on both end surfaces of the rotor, and the motor shaft 108 are integrally molded by a non-magnetic member. Has been done. Also in the fourth embodiment, the rotor assembly in which a plurality of rotor pieces 10 are stacked is fitted in a predetermined mold and is filled with aluminum or resin to fill the slit, the end ring 17, and the motor shaft. 108 is molded as an integral non-magnetic structure.

As with the motors of the first, second and third embodiments, the motor of the fourth embodiment does not damage the rotor even at high speeds.

In the above embodiment, the four-pole rotor has been described, but the present invention can be similarly applied to other than the four-pole rotor. Further, the present invention can be applied to the slits having a shape other than a circular arc. Further, the present invention can be applied even if the number and shape of the coupling portions that couple the adjacent magnetic paths of the rotor element are different from those in the embodiment. Further, the present invention can be applied even if the rotor has a salient pole structure instead of a circular shape. Also,
The present invention can be applied even if the end ring is not circular.

[0017]

As described above, according to the present invention, the filling member that fills the inside of each slit with the magnetic path that receives the centrifugal force due to the rotation of the rotor and the end rings on both end surfaces of the rotor are made non-magnetic. Since it is fixed by a non-magnetic structure integrally molded with a member, the rotor is not damaged even at high speed rotation.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a rotor of a synchronous motor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a rotor piece of a rotor of the synchronous motor according to the first embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a rotor of a synchronous motor according to a second embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a rotor of a synchronous motor according to a third embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a rotor of a synchronous motor according to a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a rotor element of a four-pole rotor of a conventional synchronous motor.

[Explanation of symbols]

17 end rings, 101 rotor element, 103 slit, 104.106 magnetic path, 105 magnetic pole, 108
Motor shaft.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-7-274460 (JP, A) JP-A-6-153428 (JP, A) JP-A-3-36945 (JP, A) JP-A-1- 318579 (JP, A) Actual development 57-61970 (JP, U) Actual publication 49-21525 (JP, Y1) US patent 2913607 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB) Name) H02K 19/10 H02K 1/22 H02K 1/27 501

Claims (4)

(57) [Claims] 1. A rotor for a synchronous motor, which is made of a high magnetic permeability material and has a plurality of magnetic paths formed by providing a plurality of slits from a magnetic pole position in the circumferential direction to an adjacent magnetic pole position . A rotor for a synchronous motor, comprising: a non-magnetic member filled in a slit; and an end ring integrally formed with the non-magnetic member on both end faces of the rotor. 2. A rotor for a synchronous motor according to claim 1, wherein a plurality of the rotors according to claim 1 are arranged in a rotation axis direction. 3. A rotor for a synchronous motor, which is made of a high magnetic permeability material and has a plurality of slits formed from magnetic pole positions in the circumferential direction to adjacent magnetic pole positions, and a plurality of rotor blocks arranged at regular intervals, A rotor for a synchronous motor comprising: a non-magnetic member filled in a gap between a slit and a rotor block; and end rings integrally formed with the non-magnetic member on both end faces of the rotor. 4. The rotor for a synchronous motor according to claim 1, wherein the motor shaft is integrally molded from the same member as the non-magnetic member.