JP2002034185A - Permanent magnet reluctance rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet reluctance rotating electric machine capable of reducing stress in a rotor core, eliminate the fear of a permanent magnet scattering or a rotor being damaged, and attaining high-speed rotation. SOLUTION: The permanent magnet 6 is fixed to an inner-periphery surface 9 of a permanent magnet embedding hole 5 by means of magnetic attraction to relieve stress in the rotor core 4 at the time of rotation. The permanent magnet 6 is stably fixed at a position close to a rotating shaft with smaller wall thickness in the core 4 like this to minimize stress in the core 4 with rotation. It is thus possible to provide the permanent magnet reluctance rotating electric machine capable of attaining high reliability, easy manufacturing high- speed rotation, and high output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type reluctance type rotating electric machine.

[0002]

2. Description of the Related Art FIG. 11 is a radial sectional view showing a conventional permanent magnet type reluctance type rotary electric machine having a four-pole structure.

In FIG. 11, a stator 1 has an armature coil 2 and a rotor 3 is provided inside the armature coil 2. The rotor 3 includes a (rotor) iron core 4 and a permanent magnet 6, and the rotor iron core 4 is formed of a laminated structure of magnetic steel sheets, and is easily magnetized and hardly magnetized in a circumferential direction around the rotation axis. The directions are alternately formed.

In order to form magnetic irregularities on the outer peripheral surface of the rotor 3, eight permanent magnet embedding holes 5 are formed in the iron core 4 along the direction of easy magnetization, and the permanent magnets 6 are embedded with the permanent magnets. It is fitted in the hole 5 and is fixed by an adhesive.

[0005] The eight permanent magnets 6 are arranged in a cross shape in the radial direction from the center of rotation to form four convex poles, that is, magnetic pole portions 4a (four poles).

In FIG. 11, an intermediate portion of a permanent magnet 6 having a salient pole, that is, an iron core 4 between two salient poles,
A non-magnetic portion 8 composed of a hollow portion is provided, and a gap 4b between the magnetic poles is formed. That is, the portion sandwiched between the permanent magnets 6 located on both sides of the non-magnetic portion 8 becomes a magnetic recess, and the permanent magnets 6 in the permanent magnet embedded holes 5 cancel the magnetic flux of the armature current passing between the magnetic poles 4b. Magnetized. A pair of permanent magnets 6, located on both sides of the magnetic pole portion 4a,
6 have the same magnetization direction in the circumferential direction of the rotor 3, and the pair of permanent magnets 6, 6 located on both sides of the magnetic pole gap 4b have opposite magnetization directions opposite to each other in the circumferential direction. Becomes The permanent magnet 6 is preferably magnetized in a direction substantially perpendicular to the magnetic pole (convex pole) axis.

Next, the operation of the conventional permanent magnet type reluctance type rotary electric machine having the above-described configuration will be described.

FIG. 12 shows the magnetic flux φd of the component along the magnetic pole axis of the iron core 4 due to the armature current on the d-axis (so-called magnetic flux-friendly portion).
Since the iron core 4a is used as a magnetic path, the magnetic path in this direction has extremely low magnetic resistance, and magnetic flux easily passes.

FIG. 13 shows a magnetic flux φq in a direction along a line connecting the center of the magnetic pole 4b and the center of the rotor 3 due to the armature current on the q-axis (so-called hard to pass magnetic flux). The magnetic flux φq forms a magnetic path crossing the non-magnetic portion 8 of the permanent magnet 6 and the gap 4b between the magnetic poles. Therefore, the relative magnetic permeability of the non-magnetic portion 8 formed of a cavity is "1", and the relative magnetic permeability of the permanent magnet 6 is also substantially "1". Therefore, the magnetic flux φq due to the armature current decreases due to the high magnetic resistance. .

Since the permanent magnets 6, 6 located on both sides of the magnetic pole portion 4a are magnetized in a direction substantially perpendicular to the magnetic pole axis as described above, as shown in FIG. The magnetic flux generated in 6 flows in the circumferential direction of the magnetic part 7 in the outer peripheral region of the iron core 4 to form a magnetic circuit φma of a path returning to the opposite pole of the self through the magnetic pole part 4a. At this time, a part of the magnetic flux of each of the permanent magnets 6, 6
Through the stator 1 through an air gap between the rotor 3 and the rotor 3 and the permanent magnet 6 and the magnetic pole 4a of the rotor 3 adjacent to each other.
, A magnetic circuit φmb returning to the original permanent magnet 6 is also formed.

As shown in FIG. 13, the interlinkage magnetic flux of the permanent magnet 6 is distributed in a direction opposite to the magnetic flux φq of the central axis direction component between the magnetic poles 4b by the q-axis armature current, and penetrates from the magnetic pole gap 4b. And repel each other and repel each other.

Therefore, in the air gap portion outside the space between the magnetic poles 4b, the magnetic flux density of the air gap created by the armature current is reduced by the magnetic flux of the permanent magnet 6, and the magnetic pole portion 4a
Large change (difference) compared to the above air gap magnetic flux density
Present. As a result, a change in the air gap magnetic flux density with respect to the position of the rotor 3, that is, a large change in magnetic energy is obtained.

Further, even when a load is applied, a magnetic portion 7 is magnetically short-circuited in a boundary region between the magnetic pole portion 4a and the magnetic pole portion 4b, and the magnetic portion 7 is largely saturated with a load current. As a result, the magnetic flux of the permanent magnet 6 distributed between the magnetic poles 4b increases, and the high magnetic resistance in the non-magnetic portion 8 and the permanent magnet 6 and the magnetic flux of the permanent magnet 6 cause the air gap magnetic flux density distribution, that is, the magnetic energy change. Large irregularities are formed, and a large output is derived from the rotating electric machine.

Incidentally, in the permanent magnet type reluctance type rotating electric machine, since the permanent magnets 6 are arranged at intervals in the circumferential direction of the rotor 3, the permanent magnets 6 extend over substantially the entire circumference in the outer circumferential direction of the rotor 3. The surface area of the permanent magnet 6 itself is smaller and the amount of interlinkage magnetic flux by the permanent magnet 6 is smaller than that of a general permanent magnet type rotating electric machine in which the permanent magnets 6 are arranged.

In the permanent magnet type reluctance type rotating electric machine, most of the magnetic flux of the permanent magnet 6 in the non-excited state is
The leakage magnetic flux in the rotor core 4 passing through the magnetic part 7. Therefore, in this state, the induced voltage can be extremely small.
Iron loss during non-excitation is reduced. Further, the overcurrent flowing when the armature coil 2 is short-circuited is small.

Further, in the permanent magnet type reluctance type rotating electric machine, the interlinkage magnetic flux due to the armature current (the exciting current component and the torque current component of the reluctance type rotating electric machine) is added to the interlinkage magnetic flux due to the permanent magnet 6 at the time of load. To induce terminal voltage.

On the other hand, in a general permanent magnet type rotating electric machine,
It is difficult to adjust the terminal voltage because the flux linkage of the permanent magnet 6 occupies most of the terminal voltage. However, in the permanent magnet type reluctance type rotating electric machine, the flux linkage by the permanent magnet 6 is small, so There is a feature that the terminal voltage can be adjusted widely by adjusting the current component widely.

That is, in the permanent magnet type reluctance type rotating electric machine, the exciting current component can be adjusted so that the voltage becomes equal to or less than the power supply voltage according to the rotating speed, and a wide range of variable speed operation can be performed at a constant voltage from the base speed. It becomes possible. In addition, since the voltage is not suppressed by performing the field weakening by the forcible control, no overvoltage is generated even if the control stops operating at high speed rotation.

Furthermore, since the permanent magnet type reluctance type rotating electric machine has a configuration in which the permanent magnet 6 is embedded in the rotor core 4, the core 4 of the electromagnetic steel sheet having a laminated structure is used.
This itself serves as a holding mechanism for the permanent magnet 6, and scattering of the permanent magnet 6 due to centrifugal force of rotation is prevented.

Further, in the conventional permanent magnet type reluctance type rotary electric machine, the magnetic flux φq generated by the q-axis current to the rotor 3 formed by the armature current shown in FIG. Outer peripheral thin portion 18 of magnet embedding hole 5,
Bridge thin portion 19 between the magnetic poles 4b near the rotation center axis
, The difference between the magnetic flux φd due to the d-axis current and the magnetic flux φq due to the q-axis current decreases, and the reluctance torque decreases.

Therefore, the magnetic flux φq due to the q-axis current, which is ineffective for the rotational torque, reduces the ineffective magnetic flux flowing from the outer peripheral side of the non-magnetic portion 8 to the outer peripheral thin portion 18 of the permanent magnet embedding hole 5. In order to reduce the leakage of generated magnetic flux (permanent magnet invalid magnetic flux 17), it is conceivable to make the periphery of the permanent magnet embedded hole 5 of the iron core 4 and the outer peripheral side of the gap 4b between the magnetic poles as narrow as possible in the radial direction.

[0022]

However, in the above-described conventional permanent magnet type reluctance type rotating electric machine, when the area around the permanent magnet embedment hole 5 and the outer peripheral side of the gap 4b between the magnetic poles are narrowed in the radial direction, the permanent rotation due to the rotation increases. It becomes difficult to support the centrifugal force of the magnet 6 itself with the rotor core 4, and especially when applied to a high-speed rotating machine, the scattering of the permanent magnet 6,
The rotor 3 is damaged, making it difficult to establish a rotating electric machine.

Further, in the conventional permanent magnet type reluctance type rotating electric machine, it is conceivable that the amount of the permanent magnet 6 is increased in order to compensate for the amount of the ineffective magnetic flux and the amount of the leakage magnetic flux and to secure the necessary effective magnetic flux in terms of characteristics. However, there is a space problem that the ratio of the volume occupied by the permanent magnet embedding hole 5 to the entire volume of the rotor 3 increases, and a structural and strength problem because the stress of the permanent magnet 6 due to the centrifugal force further increases. Therefore, it is difficult to simply increase the amount of the permanent magnet 6.

Conventionally, the permanent magnet 6 is fixed in the permanent magnet embedding hole 5 with an adhesive, but the adhesive strength is reduced due to the deterioration of the adhesive and the like, and the permanent magnet 6 may fall off in the permanent magnet embedding hole 5. There is also. The permanent magnet 6 that has fallen in the permanent magnet embedded hole 5 presses against the outer peripheral side of the permanent magnet embedded hole 5, that is, the wall on the side farther than the rotation axis due to the centrifugal force caused by the rotation of the rotor 3, so that This leads to an increase in stress on the outer peripheral thin portion 18 of the permanent magnet embedding hole 5 that supports the outer peripheral side between the magnetic poles 4b and on the central bridge thin wall 19 between the magnetic poles 4b.

Therefore, when the rotor having the above configuration is applied to a high-speed rotating and high-output rotating electric machine, the outer peripheral thin portion 18 and the central bridge thin portion 19 are increased by the increased centrifugal force.
Is damaged, and there is a concern that the permanent magnet 6 may be scattered or the rotor 3 may be damaged.

The permanent magnet 6 in the conventional permanent magnet type reluctance type rotary electric machine has an isotropic shape and no directionality with respect to the magnetization direction, so that the magnetization direction of the permanent magnet 6 can be visually checked. Since it was not possible to discriminate and the worker could insert the permanent magnet 6 in the wrong direction when assembling the rotor 3, there was a need for improvement.

[0027]

According to the first aspect of the present invention,
A stator having an armature coil, and a permanent magnet provided inside the permanent magnet embedded hole in the iron core so as to cancel a magnetic flux of the armature passing between adjacent magnetic poles inside the stator. In the permanent magnet type reluctance type rotating electric machine having a non-magnetic portion on the outer peripheral side of the permanent magnet between and a rotor having magnetic irregularities formed in the circumferential direction, the permanent magnet is substantially orthogonal to its magnetization direction, In addition, it is characterized in that it is fixed to the wall surface of the permanent magnet embedding hole on the side opposite to the non-magnetic part, and a gap is provided between the permanent magnet and the non-magnetic part.

According to a second aspect of the present invention, in the permanent magnet type reluctance type rotating electric machine according to the first aspect, the permanent magnet is fixed to a wall surface of the buried hole by a magnetic attraction force of the permanent magnet. .

According to a third aspect of the present invention, in the permanent magnet type reluctance type rotating electric machine according to the second aspect, the permanent magnet is provided between the two ends in the magnetization direction and the wall surface of the permanent magnet embedded hole. There is a difference in the attraction force, and one of the end faces is always fixed to the wall surface of the permanent magnet embedding hole.

As described above, according to each of the first to third aspects of the present invention, the permanent magnet is fixed to the wall surface of the permanent magnet embedding hole on the side opposite to the nonmagnetic portion, and the permanent magnet accompanying the rotation of the rotor. Since the centrifugal force of the magnet is not applied to the non-magnetic portion that is structurally weak, damage to the rotor and scattering of the permanent magnet to the outside can be avoided.

According to a fourth aspect of the present invention, there is provided a permanent magnet type reluctance type rotating electric machine according to the third aspect,
The permanent magnet is provided on either one of both surfaces in the magnetization direction facing the wall surface of the permanent magnet embedding hole, or one of the wall surfaces of the permanent magnet embedding hole facing the both ends in the magnetization direction of the permanent magnet. The surface is provided with a step to provide a difference in magnetic attraction between both ends of the permanent magnet.

As described above, according to the fourth or fifth aspect of the present invention, a step is formed to provide a difference in the magnetic attraction force. Breakage and scattering of the permanent magnet to the outside can be avoided.

According to a sixth aspect of the present invention, in the permanent magnet type reluctance type rotating electric machine according to the third aspect, the permanent magnet is embedded in either one of the permanent magnet embedded direction and the wall surface of the permanent magnet embedded hole. A magnetic member having a step on the side facing the wall surface of the hole is interposed.

As described above, according to the sixth aspect of the present invention, since the magnetic member is interposed, the permanent magnet is more firmly fixed in addition to the effect of the third aspect of the present invention.

The invention according to claim 7 or 8 is the invention according to claim 1.
In the permanent magnet type reluctance type rotating electric machine described above, one of the permanent magnet embedded direction and the wall surface of the permanent magnet embedded hole is interposed with an elastic member such as a spring, or the permanent magnet embedded hole is nonmagnetic. It is characterized in that an elastic portion is formed by notch or cut-and-raised processing on an iron core between the portion and the portion so as to press a permanent magnet.

As described above, according to the seventh or eighth aspect of the present invention, in addition to the function of the first aspect of the present invention, the permanent magnet is more firmly fixed by the configuration of the elastic member or the elastic portion. .

According to a ninth or tenth aspect of the present invention, in the permanent magnet reluctance type rotary electric machine according to any one of the first to eighth aspects, the inner diameter of the core of the rotor is changed to the outer shape of the iron core. It is characterized in that the inner diameter of the iron core is set in a range of 25% to 55% of the dimension, or such that the stress value of the iron core accompanying the rotation of the rotor is minimized.

As described above, according to the ninth or tenth aspect of the present invention, the inner diameter of the iron core of the rotor ranges from 25% to 55% of the outer dimension of the iron core, or the stress of the iron core accompanying rotation of the rotor. Since the inner diameter of the iron core is set so as to minimize the value and the stress associated with the rotation of the rotor itself is minimized, in addition to the effects in the inventions of claims 1 to 8, more mechanically A strong rotor can be provided.

According to an eleventh aspect of the present invention, there is provided a stator having an armature coil, and a permanent magnet provided inside the stator, which is provided in an iron core so as to cancel the magnetic flux of the armature passing between adjacent magnetic poles. In a permanent magnet type reluctance type rotating electric machine having a rotor provided in a permanent magnet embedding hole, and a nonmagnetic portion provided on the outer peripheral side of the permanent magnet between the magnetic poles and having magnetic irregularities formed in a circumferential direction, The magnet is characterized in that the area of a surface substantially perpendicular to the magnetization direction of the permanent magnet changes along the magnetization direction.

According to a twelfth aspect of the present invention, in the permanent magnet type reluctance type rotating electric machine according to the eleventh aspect, the wall surface of the permanent magnet embedding hole is engaged with one end of the permanent magnet in the magnetizing direction. It is characterized by being deformed.

As described above, according to the eleventh and twelfth aspects of the present invention, the shape of the permanent magnet is changed in the direction of magnetization to have directionality.
The operator can work efficiently without making a mistake in the installation direction of the permanent magnet.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a permanent magnet type reluctance type rotating electric machine according to the present invention is shown in FIGS.
This will be described in detail with reference to FIG. Note that FIGS.
The same reference numerals are given to the same components as those of the conventional configuration shown in FIG.

(First Embodiment: Claims 1, 2, 3,
(Corresponding to No. 4) (Configuration) FIG. 1 is a radial cross-sectional view showing a first embodiment of a permanent magnet type reluctance type rotating electric machine according to the present invention.
FIG. 2 is a radially enlarged sectional view of the rotor shown in FIG.

In FIG. 1, a stator 1 includes an armature coil 2
And a rotor 3 having a laminated configuration of electromagnetic steel sheets is accommodated inside. The rotor 3 includes a rotor core 4 and a permanent magnet 6, and the rotor core 4 forms an easy magnetization direction (d-axis direction) and a hard magnetization direction (q-axis direction).

The rotor core 4 has eight permanent magnet embedment holes 5 formed along the direction of easy magnetization in order to form magnetic irregularities in the circumferential direction. A permanent magnet 6 is mounted in the permanent magnet embedment hole 5. Have been.

The non-magnetic portion 8 formed of a cavity (gap) magnetically forms a concave portion (between the magnetic poles 4b), and the permanent magnets 6 and 6 located on both sides of the non-magnetic portion 8 form the magnetic flux of the armature current passing between the magnetic poles 4b. It is magnetized so as to cancel out.

On the other hand, a pair (two) of permanent magnets 6, 6 located on both sides of the magnetic pole portion 4a have the same magnetization direction.
The two permanent magnets 6, 6 located on both sides of the magnetic pole 4b are:
The magnetization directions are opposite to each other along the circumferential direction of the rotor 3.
The permanent magnet 6 is desirably magnetized in a direction substantially perpendicular to the magnetic pole (convex pole) axis.

As shown in FIG. 2, the permanent magnet 6 is located on the inner peripheral side wall surface 9 located in the permanent magnet embedding hole 5 and closer to the rotation axis on the side opposite to the non-magnetic portion 8. It is closely fixed by its own magnetic attraction on a surface substantially perpendicular to the surface.

The inner peripheral side wall surface opposite to the fixed inner peripheral side wall surface 9 of the permanent magnet 6 (ie, the non-magnetic portion 8 side),
That is, a gap (space) is provided between the permanent magnet 6 and the outer peripheral side wall surface 10 farther from the rotation axis. In addition,
In the illustrations shown in FIG. 1 and subsequent figures, corresponding positions of the inner peripheral side wall surface 9 and the outer peripheral side wall surface 10 of the permanent magnet embedding hole 5 corresponding to both end surfaces in the magnetization direction of the permanent magnet 6 are indicated by broken lines. I do.

Therefore, as shown in FIG. 2, a step (unevenness) is formed on the surface of the permanent magnet 6 facing the outer peripheral side wall surface 10 of the permanent magnet insertion hole 5, and the protrusion of the step is formed. The portion is configured such that the surface area of a portion facing the outer peripheral side wall surface 10 is reduced. In the present embodiment,
The permanent magnet 6 is provided with a step so that the irregularities (steps) are continuous in the radial direction. However, the irregularities (steps) are continuous not in the radial direction but in the axial direction of the rotor 3. A step may be provided.

(Operation) As described above, the permanent magnet type reluctance type rotating electric machine of the first embodiment is different from the conventional one, and the permanent magnet 6 is fixed to the inner peripheral side wall surface 9 of the permanent magnet embedded hole 5. Therefore, since it is closer to the rotating shaft side, the average centrifugal force of the permanent magnet 6 itself due to the rotation of the rotor 3 of the permanent magnet 6 becomes smaller, and the stress on the rotor core 4 can be reduced. .

Therefore, the outer peripheral thin portion 18 of the permanent magnet embedding hole 5 for supporting the outer peripheral side of the rotor 3 and the central bridge thin portion 19 between the magnetic poles are all thin and have a severe strength. The permanent magnet 6 itself is fixed to the thick inner peripheral side wall surface 9 in the permanent magnet embedded hole 5, and the outer peripheral thin portion 18 and the bridge thin portion 1 associated with the rotation of the rotor 3.
The stress on 9 is reduced.

Further, the permanent magnet 6 is fixed to the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5 by its own magnetic attraction, and peels off due to aging of the adhesive due to aging or deterioration as in the prior art. Since there is no permanent magnet, the permanent magnet 6 is in the permanent magnet embedded hole 5 and is stable.

Furthermore, in this embodiment, since the permanent magnet 6 is provided with a gap in the outer peripheral side wall surface 10 of the permanent magnet insertion hole 5 so as to have unevenness on the opposing surface, the outer peripheral side wall surface 10 Since the surface area (that is, the tip area of the convex portion) of the portion closer to is small, the magnetic flux passing through the convex portion of the permanent magnet 6 is reduced. As a result, the magnetic attraction of the permanent magnet 6 against the peripheral side wall surface of the permanent magnet insertion hole 5 is reduced by the outer peripheral side wall surface 10.
The magnetic attraction between the inner peripheral side wall surface 9 becomes stronger than the magnetic attraction between the inner peripheral side wall surface 9 and the permanent magnet 6 is firmly fixed to the inner peripheral side wall surface 9 in the magnetization direction.

(Effect) As described above, according to the permanent magnet type reluctance type rotary electric machine of the first embodiment shown in FIGS. 1 and 2, the permanent magnet 6 is
Since the (average) centrifugal force is smaller and is fixed to the thick inner peripheral side wall surface 9, the stress applied to the rotor core 4 can be reduced, and damage to the rotor 3 can be avoided to improve reliability. And a higher speed rotation and an increase in output can be realized.

Further, since the permanent magnet 6 has irregularities (steps) formed on the surface facing the outer peripheral side wall surface 10 of the permanent magnet embedding hole 5 with a gap therebetween, the permanent magnet 6 and the permanent magnet embedding hole 5 are formed. The magnetic attraction force acting on each surface in the magnetization direction gives more strength, and the difference in the attraction force makes it possible to further firmly fix the permanent magnet embedded hole 5 to the inner peripheral side wall surface 9.

Further, in this embodiment, the permanent magnet 6
Is fixed in the permanent magnet embedding hole 5 by its own magnetic attraction force and does not use an adhesive as in the prior art. Therefore, the adhesive does not fall off due to withering or deterioration of the adhesive, and the core of the permanent magnet 6 is stable. 4 can be easily mounted and manufacturing efficiency can be improved.

(Second Embodiment: Corresponding to Claim 5) (Structure) FIG. 3 is a radially enlarged cross section of a rotor showing a second embodiment of a permanent magnet type reluctance electric rotating machine according to the present invention. FIG.

As shown in FIG. 3, in the present embodiment, the outer peripheral side wall surface 10 on the non-magnetic portion 8 side among the wall surfaces of the permanent magnet embedding hole 5 facing each other at both ends in the magnetization direction of the permanent magnet 6. Steps (concavities and convexities) are formed on the permanent magnet 6 so that the magnetic attraction force at both ends of the permanent magnet 6 has a difference.

Therefore, even with this configuration, the permanent magnet 6
In addition to having a gap between the outer peripheral side wall surface 10 of the permanent magnet embedding hole 5 and the convex portion of the permanent magnet 6, the surface area of a portion close to the outer peripheral side wall surface 10 (that is, the tip area of the convex portion) As in the first embodiment, the magnetic attraction force acting in the magnetizing direction of the permanent magnet 6 varies depending on the strength of the permanent magnet 6. It is firmly fixed to the side wall surface 9 side.

In this embodiment, the rotor core 4
Has a step (unevenness) along the radial direction.
As in the embodiment, a step (unevenness) may be provided along the axial direction of the rotor core 4.

(Operation) As described above, in the permanent magnet type reluctance type rotating electric machine according to the second embodiment, since the step is formed on the outer peripheral side wall surface 10 of the permanent magnet embedding hole 5, the permanent magnet 6 and the outer peripheral side wall surface 10 And the permanent magnet 6 is firmly fixed to the inner peripheral wall surface 9 in the direction of the smaller centrifugal force. .

(Effect) As described above, according to the permanent magnet type reluctance type rotary electric machine of the second embodiment shown in FIG. 3, the outer peripheral side wall surface 10 of the permanent magnet embedded hole 5, that is, the rotor core 4 side By forming a step (unevenness) on the
The permanent magnet 6 can be firmly fixed to the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5.

Therefore, also in this embodiment, the permanent magnet 6 is closer to the rotating shaft side of the permanent magnet embedding hole 5, and
Moreover, the rotor core 4 is fixed to the inner peripheral side wall surface 9 on the thick side.
, The damage to the rotor 3 can be avoided, reliability can be improved, and a permanent magnet type reluctance type rotating electric machine having a higher rotation speed and a large output can be realized.

Further, since the permanent magnet 6 is fixed in the permanent magnet embedding hole 5 by its own magnetic attraction, the fixing is stable, and since the permanent magnet 6 has a simple shape and structure, the rotor 3 can be manufactured. It will be easier.

(Third Embodiment: Corresponding to Claim 6) (Structure) FIG. 4 is an enlarged radial cross section of a rotor showing a third embodiment of the permanent magnet type reluctance electric rotating machine of the present invention. FIG.

That is, in this embodiment, the permanent magnet 6
Is fixed to the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5 via a magnetic member 11, and the magnetic member 11 has a U-shaped cross section It is provided with step-like steps (irregularities).

Then, similarly to the first and second embodiments, the outer peripheral side wall surface 1 of the permanent magnet 6 and the hole 5 for embedding the permanent magnet are provided.
Since a gap is formed between the permanent magnet 6 and the permanent magnet 6, the permanent magnet 6 is firmly fixed to the inner peripheral side wall surface 9 of the permanent magnet embedded hole 5 by magnetic attraction through the magnetic member 11. In the present embodiment, the magnetic member 11 is illustrated so as to have steps (irregularities) along the radial direction. However, the steps (irregularities) of the magnetic member 11 extend along the rotation axis direction of the rotor 3. May be provided.

(Operation) According to the permanent magnet type reluctance electric rotating machine of the third embodiment having the above-described configuration, the permanent magnet 6 is fixed to the inner peripheral side wall surface 9 via the magnetic member 11 in the magnetization direction. In addition, since the inner peripheral side wall surface 9 side of the magnetic member 11 has a step, most of the magnetic flux generated from the permanent magnet 6 reaches the inside of the rotor core 4 through the magnetic member 11. Therefore, the magnetic flux density between the convex portion of the magnetic member 11 having a small end cross-sectional area and the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5 increases, and the magnetic attraction force also increases. Thus, it is firmly fixed to the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5.

(Effects) As described above, according to the permanent magnet type reluctance type rotary electric machine of the third embodiment, the permanent magnet 6 is firmly fixed to the rotor core 4 via the magnetic member 11 and is stable. Therefore, similarly to the first and second embodiments, it is possible to provide a rotating electric machine having high reliability, high speed rotation and high output.

(Fourth Embodiment: Corresponding to Claim 7) (Structure) FIG. 5 is a radially enlarged cross section of a rotor showing a fourth embodiment of a permanent magnet type reluctance electric rotating machine according to the present invention. FIG.

As shown in FIG. 5, in the rotor 3 of the present embodiment, the elastic member 12 such as a spring has an elastic force between the permanent magnet 6 and the outer peripheral side wall surface 10 of the permanent magnet embedded hole 5. The elastic member 12 presses the permanent magnet 6, and the permanent magnet 6 is always firmly attached to the inner peripheral side wall surface 9 of the permanent magnet embedded hole 5. It is configured to be pressed and fixed.

In the present embodiment, two elastic members 12 are arranged and inserted along the radial direction of the rotor 3.
The number of 2 may be one, or three or more. The direction in which the plurality of elastic members 12 are arranged is the same as that of the rotor 3.
Not only in the radial direction but also in the direction of the rotation axis.

(Operation) As described above, in the permanent magnet type reluctance rotating electric machine of this embodiment, the permanent magnet 6
Is pressed against the inner peripheral side wall surface 9 of the permanent magnet embedded hole 5 by an elastic member 12 such as a spring in addition to the self-magnetic attraction force. Securely and firmly fixed.

(Effect) In the permanent magnet type reluctance type rotating electric machine of the fourth embodiment, the permanent magnet 6 is pressed against the inner peripheral side wall surface 9 of the permanent magnet embedded hole 5 by the elastic member 12. Since the permanent magnet 6 is fixed, the permanent magnet 6 is stable, the reliability is improved, and the rotor 3 can be rotated at a higher speed.

(Fifth Embodiment: Claims 8, 9, and 10)
(Configuration) FIG. 6 is a radially enlarged sectional view of a rotor showing a fifth embodiment of the permanent magnet type reluctance type rotating electric machine of the present invention.

That is, in the present embodiment, as shown in FIG. 6, an elastic portion 13 formed by notch or cut-and-raised processing is provided in the rotor core 4 between the permanent magnet embedded hole 5 and the non-magnetic portion 8. The elastic portion 13 is configured to always press the permanent magnet 6 toward the inner peripheral side wall surface 9 in the permanent magnet embedded hole 5.

Further, the permanent magnet type reluctance type rotating electric machine according to the present embodiment is configured such that the inner diameter d of the (rotor) iron core 4 is in the range of 25% to 55% of the outer dimension dout.

FIG. 7 is a characteristic diagram showing the relationship between the inner diameter d (horizontal axis) of the iron core 4 and the maximum stress value σ (vertical axis) in the iron core 4 during rotation of the rotor 3 shown in FIG. is there.

As shown in FIG. 7, in the rotating electric machine, as the inner diameter d of the (rotor) iron core 4 increases in order from d1 to dα to d2, the maximum stress value α in the iron core 4 once becomes smaller. , The characteristic becomes gradually larger with the minimum value in the middle (dα) as a boundary. Therefore, according to the invention of this embodiment, the inner diameter dα at which the maximum stress value α in the iron core 4 is the minimum is 25% to 55% of the rotor core outer diameter dout.
%.

Accordingly, the inner diameter d is set so that the inner diameter d of the rotor core 4 is in the range of 25% to 55% with respect to the outer diameter dout, and more preferably substantially dα at which the maximum stress value α is minimized. By doing, the iron core 4 by the rotational centrifugal force
The internal stress is reduced, and a highly rigid rotor 3 can be obtained.

When the shape and arrangement of the permanent magnet 6 and the permanent magnet embedment hole 5 are different from each other, the optimum inner diameter dα at which the stress value in the rotor core 4 is minimized slightly changes. However, the optimum inner diameter dimension dα is also in the range of 25% to 55% with respect to the core outer diameter dout.

Therefore, in the permanent magnet type reluctance type rotating electric machine of this embodiment, the permanent magnet 6 in the permanent magnet embedded hole 5 receives the bias by the elastic portion 13 in addition to its own magnetic attraction. The rotor core 4 is pressed and fixed to the peripheral wall surface 9 and the inner diameter d of the rotor core 4 is
The rotor core 4 is more preferably in the range of 5% to 55%.
The inner diameter dα is set so as to minimize the stress value in the inside.

In this embodiment, the (rotor) iron core 4
Although the elastic portion 13 is formed by notching or cutting and raising along the radial direction, the elastic portion 13 can of course be provided along the rotation axis direction.

(Operation) According to the permanent magnet type reluctance type rotating electric machine configured as described above, the elastic portion 13 is provided in the rotor core 4 between the permanent magnet embedded hole 5 and the non-magnetic portion 8. The permanent magnet 6 is urged by the elastic portion 13, and the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5 of the permanent magnet 6 is provided.
Fixed to and stable.

Further, since the inner diameter d of the rotor core 4 is configured to be within the range of 25% to 55% of the outer diameter dout, the stress in the rotor core 4 due to the rotation is minimized. Can be suppressed.

(Effect) As described above, the permanent magnet type reluctance type rotary electric machine according to the fifth embodiment has the rotor core 4
The permanent magnet 6 is pressed against the inner peripheral side wall surface 9 of the permanent magnet embedding hole 5 by the elastic portion 13, so that the permanent magnet 6 is firmly fixed together with its own magnetic attraction, and high-speed rotation becomes possible. , Reliability is also improved.

Further, the elastic portion 13 is formed by a simple notch or cut-and-raising process on the iron core 4 and does not insert an elastic member such as a spring, so that it can be manufactured without increasing the number of parts.

Further, according to this embodiment, the inner diameter d of the rotor core 4 is 25% to 55% of the outer diameter dout.
, The stress value with respect to the centrifugal force in the rotor core 4 can be minimized, and higher speed and higher output can be realized while improving reliability.

(Sixth Embodiment: Corresponding to Claims 11 and 12) (Structure) FIG. 8 is a radial cross-sectional view showing a sixth embodiment of the permanent magnet type reluctance rotating electric machine of the present invention. FIG. 9 is a radially enlarged sectional view of the rotor shown in FIG. 8, and FIG. 10 is a perspective view of the permanent magnet shown in FIG.

In the permanent magnet type reluctance type rotating electric machine according to the present embodiment, the shape of the permanent magnet 14 inserted into the permanent magnet embedding hole 5 of the rotor core 4, as shown in FIG. It is configured so that the area of a surface (transverse cross section in the figure) orthogonal to the magnetization direction 15 indicated by the reference numeral 16 changes in the trapezoidal shape toward the magnetization direction 15 and gradually decreases in the magnetization direction.

Further, as shown in FIGS. 8 and 9, the shape of the permanent magnet embedding hole 5 into which the permanent magnet 14 is inserted is shown in FIG.
A pair of protrusions are formed inward from the inner peripheral side wall surface 9 of the rotor core 4, and the trapezoidal bottom of the permanent magnet 14 is held and fixed between the pair of protrusions.

Therefore, in this embodiment, the permanent magnet 14 can be mounted in the permanent magnet embedding hole 5 by a fitting operation between the projections of the inner peripheral side wall surface 9.

(Operation) As described above, in the permanent magnet type reluctance type rotary electric machine of this embodiment, the shape of the permanent magnet 14 is changed so that the area (lateral area) changes in the magnetization direction 15. The operator can visually recognize the magnetizing direction 15 of the permanent magnet 6 because of the holding.

(Effects) Therefore, according to the sixth embodiment, similarly to the first to fifth embodiments, the permanent magnet 6 is firmly fixed by its own magnetic attraction. Since the shape is changed along the magnetizing direction 15, a problem that the worker mounts the permanent magnet 6 in the rotor core 4 in a wrong direction can be avoided, and the manufacturing efficiency can be improved.

In each of the above embodiments, the rotary electric machine has four poles. However, it is needless to say that the number of poles is not limited to four.

As described above, according to the permanent magnet type reluctance type rotating electric machine of the present invention, the permanent magnet is fixed to the inner peripheral side wall surface of the permanent magnet embedding hole by its own magnetic attraction force. The accompanying stress in the rotor core is reduced, and high-speed rotation and high output can be realized, and a remarkable effect can be obtained in practical use.

[0098]

According to the first to third aspects of the present invention,
The permanent magnet is fixed to the wall of the permanent magnet embedding hole on the opposite side of the non-magnetic part, and the centrifugal force of the permanent magnet accompanying the rotation of the rotor reduces stress inside the rotor and avoids damage to the rotor be able to.

According to the invention described in claim 4 or 5,
Since the magnetic attraction force of the permanent magnet has a difference between both ends in the magnetization direction, damage to the rotor can be avoided as in the first to third aspects of the invention.

According to the sixth aspect of the present invention, in addition to the effect of the third aspect of the present invention, the permanent magnet can be more firmly fixed by the presence of the magnetic member.

Also in the invention according to claim 7 or 8, the presence of the elastic member or the elastic portion enables the permanent magnet to be more firmly fixed in addition to the effect of the invention described in claim 1.

According to the ninth or tenth aspect of the present invention, the stress in the iron core due to the rotation of the rotor itself can be reduced, and a rotating electric machine with higher rotation speed can be realized.

According to the eleventh or twelfth aspect of the present invention, since the shape of the permanent magnet is given a direction in the magnetizing direction, the permanent magnet can be easily and reliably mounted in the iron core.
Manufacturing efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a radial sectional view of a permanent magnet type reluctance type rotating electric machine according to a first embodiment of the present invention.

FIG. 2 is a radially enlarged cross-sectional view of the rotor shown in FIG.

FIG. 3 is an enlarged sectional view in the rotor radial direction of a permanent magnet type reluctance type rotary electric machine according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view in a rotor radial direction of a permanent magnet type reluctance type rotary electric machine according to a third embodiment of the present invention.

FIG. 5 is an enlarged sectional view in the rotor radial direction of a permanent magnet type reluctance type rotating electric machine according to a fourth embodiment of the present invention.

FIG. 6 is an enlarged sectional view in the rotor radial direction of a permanent magnet type reluctance type rotating electric machine according to a fifth embodiment of the present invention.

7 is a characteristic diagram showing a relationship between a rotor core inner diameter of the permanent magnet type reluctance type rotating electric machine shown in FIG. 6 and a maximum stress value in the rotor core.

FIG. 8 is a radial sectional view of a rotor of a permanent magnet type reluctance type rotary electric machine according to a sixth embodiment of the present invention.

FIG. 9 is an enlarged radial sectional view of the rotor shown in FIG. 8;

FIG. 10 is a perspective view of the permanent magnet shown in FIG. 9;

FIG. 11 is a radial sectional view of a conventional permanent magnet type reluctance rotating electric machine.

12 is a radial cross-sectional view showing a flow of a magnetic flux φd of a component in a direction along a magnetic pole axis of a rotor core due to an armature current of a d-axis of the permanent magnet type reluctance type rotary electric machine shown in FIG. 11;

13 is a radial direction showing a flow of a magnetic flux φq of a component in a direction along a radial axis around a magnetic pole 4b due to an armature current on the q axis of the permanent magnet type reluctance type rotary electric machine shown in FIG. 11; It is sectional drawing.

14 is a radial cross-sectional view showing a flow of a magnetic flux generated by a permanent magnet of the permanent magnet type reluctance type rotating electric machine shown in FIG.

FIG. 15 is an enlarged radial cross-sectional view of a rotor showing a flow of a magnetic flux generated by a permanent magnet of the permanent magnet type reluctance type rotating electric machine shown in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Stator 2 ... Armature coil 3 ... Rotor 4 ... (Rotor) iron core 5 ... Permanent magnet embedding hole 6 ... Permanent magnet 7, 14 ... Magnetic part 8 Non-magnetic portion 9 Inner peripheral wall surface of permanent magnet embedded hole 10 Outer peripheral wall surface of permanent magnet embedded hole 11 Magnetic member 12 Elastic member 13 Elastic portion 18: outer peripheral thin portion 19: bridge thin portion 4a: magnetic pole portion 4b: between magnetic poles

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) H02K 19/10 H02K 19/10 A 21/14 21/14 M (72) Inventor Kazuto Sakai Tsurumi-ku, Yokohama-shi, Kanagawa 2-4 Suehirocho, Toshiba Keihin Works Co., Ltd. (72) The new inventor 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture, Japan Inside the Toshiba Keihin Works Co., Ltd. (72) Inventor Yukihiko Furoo Tsurumi, Yokohama-shi, Kanagawa Prefecture 2-4, Suehirocho, Ward Toshiba Keihin Works Co., Ltd. (72) Inventor Tadashi Tokumasu 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Keihin Works Co., Ltd. (72) Inventor Shiyasu Mochizuki Mie-gun, Mie Prefecture 2121 Asahi-machi Naoyo, Toshiba Mie Plant (72) Inventor Takashi Araki 2121, Asahimachi, Mie-gun, Mie Prefecture 2121 Toshiba Mie Plant (72) Inventor Masakatsu Matsubara Asahi, Mie-gun, Mie Prefecture F-term (reference) 5 in Toshiba Mie factory H002 AA05 AB07 AC06 AE08 5H619 AA01 BB01 BB15 BB22 BB24 PP02 PP06 PP08 5H621 GA01 GA04 GA15 HH01 HH09 JK02 JK05 5H622 AA03 CA02 CA07 CA13 CB01 CB04 CB05 CB06 PP04 PP07 PP10 PP11 PP15 QB05

Claims (12)

[Claims] 1. A stator having an armature coil, and a permanent magnet provided inside the stator in a permanent magnet embedding hole in a core so as to cancel a magnetic flux of the armature passing between adjacent magnetic poles. And a non-magnetic portion provided on the outer peripheral side of the permanent magnet between the magnetic poles, and a rotor having magnetic irregularities formed in the circumferential direction, wherein the permanent magnet is magnetized. A permanent magnet type, which is substantially perpendicular to the direction and fixed to the wall surface of the permanent magnet embedding hole on the side opposite to the non-magnetic portion, and wherein a gap is provided between the wall surface and the non-magnetic portion side. Reluctance type rotating electric machine. 2. The permanent magnet type reluctance type rotating electric machine according to claim 1, wherein said permanent magnet is fixed to a wall surface of said permanent magnet embedding hole by its magnetic attraction. Type rotating electric machine. 3. The permanent magnet type reluctance type rotating electric machine according to claim 2, wherein the permanent magnet has a difference in magnetic attraction between a wall of the permanent magnet embedding hole between both ends in a magnetizing direction. Having one end face,
A permanent-magnet-type reluctance-type rotating electric machine which is always fixed to a wall surface of the permanent-magnet embedded hole. 4. The permanent magnet type reluctance type rotating electric machine according to claim 3, wherein the permanent magnet has a step on one of both end portions facing a wall surface of the permanent magnet embedding hole, and the both end portions are provided. A permanent magnet type reluctance type rotating electric machine characterized by providing a difference in magnetic attraction force in the above. 5. The permanent magnet type reluctance type rotating electric machine according to claim 3, wherein a step is provided on any one of the wall surfaces of the permanent magnet embedding hole facing both ends of the permanent magnet in the magnetization direction. A permanent magnet type reluctance type rotating electric machine, wherein a difference is provided in magnetic attraction between the both ends of the permanent magnet. 6. The permanent magnet type reluctance type rotating electric machine according to claim 3, wherein the wall of the permanent magnet embedding hole is provided on one of the wall of the permanent magnet embedding hole and the magnetizing direction of the permanent magnet. A permanent magnet type reluctance type rotating electric machine characterized in that a magnetic member having a step is interposed on the side facing the motor. 7. The permanent-magnet-type reluctance-type rotating electric machine according to claim 1, wherein an elastic member such as a spring is provided between the permanent magnet and the wall of the permanent-magnet embedding hole in the magnetization direction of the permanent magnet. A permanent magnet type reluctance type rotating electric machine characterized by being mounted. 8. The permanent magnet type reluctance type rotating electric machine according to claim 1, wherein an elastic portion is formed in the iron core between the permanent magnet embedded hole and the non-magnetic portion by notching or cutting and raising. A permanent magnet type reluctance type rotating electric machine characterized in that the permanent magnet is configured to be pressed by a portion. 9. The permanent magnet type reluctance type rotating electric machine according to claim 1, wherein an inner diameter of the core of the rotor is 25 times an outer dimension of the core.
%. The permanent magnet type reluctance type rotating electric machine is set to be in the range of% to 55%. 10. The permanent magnet type reluctance type rotating electric machine according to claim 1, wherein an inner diameter of the iron core is set so that a stress value of the iron core accompanying rotation of the rotor is minimized. A permanent magnet type reluctance type rotating electric machine having dimensions set. 11. A stator having an armature coil, and a permanent magnet provided inside the stator in a permanent magnet embedded hole in an iron core so as to cancel magnetic flux of the armature passing between adjacent magnetic poles. And a rotor provided with a non-magnetic portion on the outer peripheral side of the permanent magnet between the magnetic poles, and a rotor having magnetic irregularities formed in a circumferential direction, wherein the permanent magnet is a permanent magnet. Characterized in that the area of a surface substantially orthogonal to the magnetization direction changes along the magnetization direction. 12. The permanent magnet type reluctance type rotating electric machine according to claim 11, wherein a wall surface of the permanent magnet embedding hole is deformed to lock one end of the permanent magnet in the magnetization direction. A permanent magnet type reluctance type rotating electric machine characterized by the above-mentioned.