JPH0923598A - Magnet embedding type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high efficiency motor having improved orthogonality between magnetic flux and current by forming one-pole magnet arranged at the inside of rotor with an arcuated first magnet and a second magnet of different shape and separated from the first magnet. SOLUTION: A magnet inserting hole 104 is provided on a rotor iron core 102 and a first magnet 106 and a second magnet 108 are inserted thereto. Here, the first magnet 106 is arranged near the surface of the rotor cylinder 103. The magnetic flux permeability of the magnet is rather smaller than that of the rotor. The first magnet 106 or the rotor is formed in the normal or inverse arc. A stator 112 is provided in these rotors and to the entire circumference of the rotor. A 3-phase coil is wound to a slot 114 of the stator 112. Thereby, the generation of magnetic flux caused by the current can be reduced, the orthogonality between total magnetic flux and total current can be improved and a torque for the unit current is increased to realize a small sized motor assuring high efficiency 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 magnet-embedded motor that utilizes reluctance torque to realize a small size, high output, and high efficiency.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of miniaturization and high power output of equipment in which a motor is mounted, and energy saving, it is desired that the mounted motor also be small and high power and highly efficient.

[0003] Smaller and higher output motors using permanent magnets,
For higher efficiency, the magnet torque, which is the torque component of the magnet, is effectively used, and the magnet is placed inside the rotor core to positively utilize the reluctance torque component depending on the magnitude of the magnetic resistance (reluctance) of the rotor core. It can be realized by doing.

A conventional magnet-embedded motor will be described below with reference to FIG. In FIG. 15, 552
Is a rotor core, 553 is a rotor cylindrical surface, 554 is a magnet insertion hole of the rotor core, 556 is a first magnet, 558 is a second magnet, 560 is a shaft hole, 562 is a stator, 564 is fixed Slot for inserting the child winding (the actual winding is omitted),
570 is a q-axis magnetic flux passage and 580 is a d-axis magnetic flux passage.
The d-axis and q-axis directions are shown in FIG. Magnet polarity N, S
Shows only the stator 112 side.

The structure of the conventional magnet-embedded motor having the above-described structure will be described in detail and its operation will be described.

The rotor core 552 is made by laminating silicon steel plates of about 0.5 mm. Rotor cylindrical surface 553
Represents the cylindrical outer shape of the rotor facing the stator 562. The rotor core 552 is the first magnet 55.
6, magnet insertion hole 55 for inserting the second magnet 558
4 has been opened. The magnet insertion hole 554 is shown in FIG.
As shown in FIG. 5, the first magnet 556 and the second magnet 558 are inserted (unless otherwise specified, the magnets are inserted in the insertion hole without a gap). A shaft hole 560 for passing a shaft is provided in the center of the silicon steel plate. Here, the shape of FIG. 15 is a two-layer reverse circular arc shape in which magnets are arranged in two layers in a reverse circular arc shape. In contrast to these rotors, the stator 562 has a radius of 0.
It is fixed with a gap of about 5 mm, and the rotor is rotatable. Here, the stator 562 has three-phase windings 5
64 (not shown) is wound and a rotating field is created by passing an electric current through the winding 562 of each phase, and the rotor rotates in synchronization with the rotating field.

In FIG. 15, the d-axis is the direction of the magnetic flux by the magnet, and the q-axis is the direction orthogonal to it. Then, by applying a current (q-axis current iq) in the q-axis direction, a magnet torque Tm is generated by the magnet magnetic flux (general operation).

FIG. 15 shows a q-axis magnetic flux passage 570 and a d-axis magnetic flux passage 580 which are magnetic flux passages when a q-axis current and a d-axis current flow in the rotor. The q-axis magnetic flux passage 570 is the first
It mainly passes between the second magnet 558 and the second magnet 556.
That is, it can be understood that the d-axis magnetic flux passage 580 is blocked only by the rotor core 552, while the d-axis magnetic flux passage 580 is blocked by a magnet having a magnetic permeability lower than that of the rotor core 552. Therefore, the reluctance torque Tr is generated due to the difference in the ease of passage of the q-axis and d-axis magnetic flux of the rotor core 552. The ease with which the q-axis and d-axis magnetic flux pass is the inductance L that is the motor constant.
It is expressed using q and Ld. That is, in FIG. 15, Lq> Ld. The torque formula is shown in (Equation 1).

[0009]

[Equation 1]

Where ψ: interlinkage magnetic flux of the magnet, Ld, Lq:
d, q axis inductance, id, iq: d, q axis stator current. In (Equation 1), the first term represents the magnet torque Tm using the magnetic flux of the magnet, and the second term represents the reluctance torque Tr. iq represents the torque current of the conventional surface magnet type motor. In addition, the reluctance torque T can be
id produces a negative value to generate r. A negative value of id is in the direction of advancing the current phase.

Here, letting I be the total current obtained by vector addition of id and iq, id and iq are given by (Equation 2).

[0012]

[Equation 2]

Here, θ represents the amount of current phase advance. By substituting (Equation 2) into (Equation 1), (Equation 3) is obtained.

[0014]

(Equation 3)

Here, the amount of current phase advance, the magnet torque Tm, and the reluctance torque Tr obtained from (Equation 3),
FIG. 16 shows the relationship with the total torque (Tm + Tr).

In FIG. 16, the maximum total torque is obtained when the current phase advances by 30 degrees. By controlling the current phase to the optimum phase in this way, it is possible to obtain a total torque of Tm or more and to achieve a compact size and high output.

Current phase θt for obtaining maximum torque with the same current
Is obtained by (Equation 4) by partially differentiating (Equation 3) with the current phase θ and setting it to zero.

[0018]

(Equation 4)

[0019]

In the conventional magnet-embedded motor, it was considered that magnets should be arranged in a reverse circular arc shape and Lq should be designed large in order to obtain reluctance torque. However, as Lq and (Ld-Lq) are increased, the orthogonal relationship between the magnetic flux and the torque becomes worse. Therefore, there is a problem that the efficiency improvement rate is deteriorated.

This will be described with reference to the drawings. FIG. 17 shows the relationship between the magnetic flux and the current. Where the total magnetic flux Φ is φ, Lq
iq and Ldid, and the total current I is composed of id and iq.
In FIG. 17, the total magnetic flux Φ and the total current I have a phase of about 60 degrees. However, Φ and I can turn the magnetic flux generated most efficiently in the phase of 90 degrees into torque. That is, the torque is given by (Equation 5).

[0021]

(Equation 5)

That is, if the orthogonal relationship between the current and the magnetic flux deteriorates, torque cannot be effectively generated with respect to the applied current, resulting in a motor with poor drive efficiency.

Further, when the current phase advance is performed to obtain the maximum torque, there is an essential problem that the phase advance leads to a decrease in Tm as shown in FIG.

[0024]

In order to solve the above problems, in the magnet-embedded motor of the present invention, the rotor core and the magnet for one pole arranged inside the rotor are on the surface of the rotor cylindrical portion. An arc-shaped first magnet that follows the shape and a second magnet that is separated from the first magnet and has a different shape are provided.

Still another magnet-embedded motor according to the present invention has a substantially rectangular shape in which a magnet for one pole of the first magnet is arranged from the vicinity of the surface of the rotor cylindrical portion to the vicinity of the surface of the rotor cylindrical portion. Is.

Still another magnet embedded motor according to the present invention,
Each one-pole rotor core is provided with at least one of a gap, a notch, and a magnet insertion hole large with respect to the magnet in a portion opposite to the rotation direction of the rotor.

[0027]

According to the present invention, the amount of magnetic flux generated by id current is increased by arranging the first magnet having a smaller magnetic flux permeability than the rotor core near the surface of the rotor cylindrical portion (regular arc shape). Decreases. That is, the inductance Ld decreases. By reducing the inductance Ld, the orthogonality between the magnetic flux and the current is improved, and a high-efficiency motor is obtained.

Further, by arranging a magnet having a substantially rectangular shape arranged from the vicinity of the surface of the rotor cylindrical portion to the vicinity of the surface of the rotor cylindrical portion inside the rotor, the inductance Ld can be formed by using a low-cost magnet which is easy to prepare. To make the motor highly efficient.

Further, by providing a gap or a notch in a portion of the rotor core on the side opposite to the rotating direction of the rotor where magnetic flux for one pole is generated, the magnetic flux of the magnet becomes stronger on the rotating direction side of the rotor. This means that when the current phase advance is taken into consideration, the sign of the induced voltage due to the current and the magnetic flux of the magnet is different, and the magnetic flux when the negative torque Tm is generated is reduced, and instead, the positive torque Tm of the same sign is generated between the current and the magnetic flux. In the case of increasing the magnetic flux, the torque T due to the current phase lead
A highly efficient motor that suppresses the decrease in m and increases the total torque.

[0030]

Embodiments of the magnet-embedded motor of the present invention will be described below with reference to the drawings.

In the first embodiment, the arc-shaped magnet is arranged inside the rotor along the shape of the surface of the rotor cylindrical portion to reduce the inductance Ld and make the motor highly efficient.

FIG. 1 is a sectional view of a magnet-embedded motor according to a first embodiment of the present invention. In FIG. 1, 102 is a rotor core, 103 is a rotor cylindrical surface, 104 is a rotor core magnet insertion hole, 106 is a first magnet, 108 is a second magnet, 110 is a shaft hole, and 112 is fixed. The child 114 is a slot into which the stator winding is inserted (the actual winding is omitted). N and S represent only the polarity of the magnet on the stator 112 side.

FIG. 1 shows the shape of the first magnet 106 and the rotor core 102 and the magnet insertion hole 1 in accordance with the shape of the first magnet 106 in comparison with the conventional example.
04 is different. Here, regarding the rotor configuration, the same points as in the conventional example will be briefly described.

The rotor core 102 is made by laminating silicon steel plates punched in a circular outer shape. Therefore, the rotor cylindrical surface 103 has a cylindrical shape. The rotor core 102 is provided with a magnet insertion hole 104 for inserting the first magnet 106 and the second magnet 108. The first magnet 106 and the second magnet 108 are inserted into the magnet insertion hole as shown in FIG. Here, the first magnet 106 is arranged near the surface of the rotor cylindrical portion. The magnet has a smaller magnetic flux permeability than the rotor core. A shaft hole 110 is provided in the center of the silicon steel plate.

Here, the shape of the first magnet 106 or the rotor of FIG. 1 will be referred to as a regular arc shape. There is a stator 112 for these rotors and around the rotor. Slot 1 for inserting the stator winding of the stator 112
Three-phase windings of u, v, and w are wound around 14. A rotating field is created by passing an electric current through the winding, and the rotor rotates in synchronization with the rotating field.

The characteristics of the motor having the rotor configured as shown in FIG. 1 will be described with reference to FIGS. FIG. 2A is a magnetic flux diagram when an id current is passed through the stator winding in the first embodiment. The magnetic flux is proportional to the inductance L and the current. Therefore, a small magnetic flux means a small inductance. FIG. 2B shows the case of iq in the first embodiment.
The magnetic flux diagram when an electric current is sent is shown. It can be understood from the comparison with FIG. 2A that more magnetic flux is generated when iq is passed than when id is passed. That is, as described in the conventional example, Ld <Lq, and Tr is generated from (Equation 1).

Next, in both the first magnet and the second magnet of the related art, the magnetic fluxes when id and iq are given in the case where the convex portion has an arc shape (two-layer reverse arc shape) in which the convex portion faces the rotation axis side. The diagrams are shown in FIGS. 3 (a) and 3 (b). The magnetic flux of FIG.
It can be seen that the magnetic flux is less than the magnetic flux in (a), and the inductance Ld of the first embodiment is smaller than that of the conventional example. Further, the size of Lq is maintained by maintaining the gap between the first magnet and the second magnet. Therefore, the values of the difference in inductance (Ld-Lq) are the same in FIGS. 2 and 3, and the reluctance torque can be effectively utilized similarly.

FIG. 4 shows the relationship between the change in the inductance Ld and the angle between the current and the magnetic flux. That is, from (Equation 4), the inductance difference (Ld-Lq) is kept constant and the inductance Ld is large (FIG. 4a) and Ld is small (FIG. 4b) (Ld = 0 extreme example). FIG. 4 shows the result of the calculation of the angle β between the phase θt of the total current I and the total magnetic flux Φ.

That is, by reducing the inductance Ld, the orthogonality between the current and the magnetic flux is improved and the efficiency can be improved.

Further, FIG. 5, FIG. 6 and FIG. 7 show the structure of another rotor similarly provided with a magnet having a regular arc shape (the stator is the same and therefore omitted). FIG. 5 shows a substantially rectangular shape in which the second magnet 109 is arranged in the radial direction. When the magnetic pole cannot determine the stator 112 side, both N and S are marked. FIG. 6 shows a configuration in which the number of second magnets 111 is reduced. FIG. 7 shows a configuration in which the magnet side surface on the circumferential side of the first magnet 107 intersects the extension lines of the two side surfaces inside the rotation axis center in order to secure the q-axis magnetic flux passage. It is needless to say that the inductance Ld can be similarly reduced in all cases to achieve high efficiency.

Here, in FIG. 1, FIG. 5, FIG. 6, FIG. 7 and FIG. 14 described later, even if the stator side of the first magnet is covered with the thin rotor core 104, the magnet surface is fixed as it is. It goes without saying that it does not matter whether the child faces the child.

Next, a magnet-embedded motor according to a second embodiment of the present invention will be described. In the second embodiment, by arranging a magnet having a substantially rectangular shape arranged from the vicinity of the surface of the rotor cylindrical portion to the vicinity of the surface of the rotor cylindrical portion inside the rotor, it is possible to use a low-cost magnet that is easy to create. The inductance Ld is small and the motor is highly efficient.

FIG. 8 is a sectional view of a magnet-embedded motor according to a second embodiment of the present invention. In FIG. 8, 202 is a rotor iron core, 103 is a rotor cylindrical surface, 204 is a rotor iron magnet insertion hole, 206 is a first magnet, 108 is a second magnet, and 110 is a shaft hole. Illustrations of the stator 112 and the slot 114 for inserting the stator winding are omitted.

In contrast to the first embodiment, the second embodiment has the shape of the first magnet 206 and the rotor core 20 according to the shape change.
2. The magnet insertion holes 204 are different.

In the rotor having the structure shown in FIG. 8, it is possible to improve the efficiency by reducing the inductance Ld according to the same idea as described in the first embodiment. However, as shown in FIG.
A rotor core thicker than that in the first embodiment is provided on the outer side of the rotor core cylindrical portion of the magnet 206 of FIG. Therefore, although the inductance Ld does not become smaller than that of the first embodiment, it is possible to make the inductance Ld sufficiently smaller than that of the conventional example shown in FIG. Further, as shown in A of FIG. 8, the first magnet 206 is chamfered at the magnet corner portion on the rotation center side in order to secure the inductance Lq magnetic flux passage.

In the second embodiment, since the cross section of the first magnet 206 is substantially rectangular, it is easy to produce, and the efficiency can be improved by using a magnet that requires a small number of post-processing steps and is low in magnet production cost.

The shape of the cut shown in FIG. 8A may be an R shape or the like. Next, a magnet embedded type motor according to a third embodiment of the present invention will be described.

In the third embodiment, the rotor iron core for one pole is provided with a notch on the side opposite to the rotating direction of the rotor and the magnetic flux direction is changed to change the magnetic phase advance control of the magnet torque. It is intended to realize a highly efficient motor that suppresses the decrease.

FIG. 9 is a sectional view of a magnet-embedded motor according to a third embodiment of the present invention. In FIG. 9, 302 is a rotor iron core, 304 is a magnet insertion hole of the rotor iron core, 306
Is a magnet, 110 is a shaft hole, and 316 is a notch.

In this embodiment, the second magnet 108 of the first embodiment shown in FIG. 1 and the magnet insertion hole 104 for inserting the second magnet 108 are eliminated and a notch 316 is added. Stator 112, slot 11 for inserting stator winding
4 is omitted.

The notch 316 is formed in the axial direction of the rotor core 30.
2 through. The effect will be described with reference to FIGS.

FIG. 10 shows the current for one phase, the waveform of the induced voltage due to the magnetic flux of the magnet, and the torque when there is no current advance.
The vertical axis in each of FIGS. 10 to 12 gives an appropriate numerical value to indicate the size standard. In order to make the torque easy to see, the value calculated by torque = 2 × current × induced voltage is displayed. Since there is no current phase advance, the signs of the current and the induced voltage are the same, and there is no place where the torque for one phase shows a negative value. When the Tm for one phase in FIG. 10 is generated, the current phase lead corresponds to 0 degree in FIG. 23, and Tm is the maximum. Here, the torque generated by the motor is, for example, 120 when three-phase current is passed through the stator.
It can be obtained by adding three torques whose phases are shifted by degrees.

FIG. 11 shows the phase lead current for one phase and the induced voltage waveform and torque due to the magnetic flux of the magnet in the conventional example. In FIG. 11, the current phase is advanced by 30 degrees. When the current phase is advanced, as shown in FIG. 11, the induced voltage waveform and the current are out of phase with each other, and a negative torque is generated as much as the current phase advances, which causes a decrease in magnet torque. FIG.
FIG. 23 shows the amount of decrease in Tm when the torque is generated.

By providing the notch 316 as shown in FIG. 9 as compared with the conventional case, the magnetic flux of the magnet is reduced in the portion where the negative torque is generated. FIG. 13 shows a change in the direction of the magnetic flux of the magnet due to the current application position and the notch in the 180 ° section in which the current has the same sign when a sine wave current with a 30 ° phase lead is applied.
Further, FIG. 12 shows the phase lead current for one phase and the induced voltage waveform and torque due to the magnet flux in the third embodiment.
(Strictly speaking, the waveform of the induced voltage is not such a waveform, but is a distorted waveform, but Fig. 12 is sufficient to understand its function.) As shown in Figs. 12 and 13, a negative torque is generated. To reduce the magnetic flux. Further, the corresponding magnetic flux goes to a place where a positive torque is generated, and the magnetic flux that contributes to the generation of the positive torque is increased to increase the positive torque.

FIG. 14 shows the current phase and torque. That is, the negative torque is decreased, the positive torque is increased, and the decrease amount of Tm shown in FIG. 23 is reduced, so that the total torque is increased (strictly speaking, the reluctance torque is smaller than the conventional one). Become.).

As described above, even if the current phase is advanced, Tm does not decrease so much and the torque generation amount for the same current increases, so that small size and high efficiency can be realized.

Further, FIG. 15 shows a magnetic pole of 6 poles when a gap 318 is provided on the surface of the rotor cylindrical portion on the opposite side of the rotation direction of each 1 pole, and a rotor when the magnet 306 is reduced. FIG.
The total torque results by simulation in the case of the air gap 318 and in the case of changing the air gap 318 to an iron core (there is no air gap) are shown in FIG. It is clear that the air gap 318 increases the total torque, and it goes without saying that the same effect is obtained.

Next, another rotor structure according to the third embodiment of the present invention is shown in FIGS. FIG. 17 shows a diagram in which the notch is enlarged to about 40% of the rotor core surface. Further, in FIG. 18, since the notch amount is increased toward the end of the magnetic pole, the air gap (magnetic resistance) is increased toward the end, and the induced voltage increases toward the center of the magnetic pole. By the way, the ratio of the notch shown in FIG. 9 for one pole to the rotor core surface is about 9%. That is, it is normally considered to be about 3% to 15%. However, when it is driven well with a large phase lead of about 40 to 60, it is considered that the notch is effective up to about 45%.

Further, FIG. 18 is a diagram when the first and third embodiments are employed together. In FIG. 17, the shape of the magnet insertion hole 305 on the opposite side of the rotation direction of each one pole is made larger than the magnet shape. Further, in the two-layer magnets of the first magnet 106 and the second magnet 108, the first magnet 107 is moved in the rotation direction from the magnetic pole center in order to secure the q-axis magnetic flux passage between the magnets. As a result, the synergistic effect of the first and third embodiments can be obtained.

FIG. 18 shows a case where the rotor core corresponding to one pole is provided with notches 317 at both ends. FIG.
In the case of the induced voltage by the magnet, the central portion (current phase is around 90 degrees) is larger than that in the case shown in FIG. 12, and the end portion (current phase is around 0 to 30 degrees) is smaller due to the notch. This structure is particularly effective when the drive current phase lead is small (within 30 degrees) and the reluctance torque is little used. Since the difference between the phase of the induced voltage and the current phase due to the magnet is small, increasing the induced voltage in the part where the current is large will also increase the amount of torque generated for the same current, making it possible to realize small size and high efficiency. .

The third embodiment is effective when the rotation direction is biased clockwise or counterclockwise, or when efficiency is emphasized only in one rotation direction.

Although the sine wave driving has been described here, it goes without saying that the same effect can be obtained in the rectangular wave driving. Further, the same effect can be obtained even if the number of phases of the stator changes.

Further, a magnet having a higher magnetic flux density than a thick magnet is used, and the thinner the magnet is, the better the effect of the notch for changing the magnetic flux of the magnet appears because the air gap is not blocked by the magnet.

It is needless to say that the magnet is effective not only in one layer and two layers but also in multiple layers for one pole.

[0065]

According to the present invention, the magnet for one pole arranged inside the rotor is separated from the first magnet and the first magnet, which are arcuate in shape along the shape of the rotor cylindrical surface. By providing the second magnets having different shapes, the amount of magnetic flux generated by the id current can be reduced. Therefore, the orthogonality between the total magnetic flux and the total current is improved, the torque per unit current is increased, and high efficiency, small size and high output motor can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnet-embedded motor according to a first embodiment of the present invention.

FIG. 2 is a magnetic flux diagram when a current is applied to the stator winding in the first embodiment of the present invention.

FIG. 3 is a magnetic flux diagram when a current is applied to a stator winding in a conventional two-layer reverse arc shape.

FIG. 4 is a diagram showing the relationship between Ld and the angle between current and magnetic flux.

FIG. 5 is a diagram showing another rotor structure in the first embodiment of the present invention.

FIG. 6 is a diagram showing another rotor structure according to the first embodiment of the present invention.

FIG. 7 is a diagram showing another rotor structure in the first embodiment of the present invention.

FIG. 8 is a sectional view of a magnet-embedded motor according to a second embodiment of the present invention.

FIG. 9 is a sectional view of an embedded magnet type motor according to a third embodiment of the present invention.

FIG. 10 is a diagram showing an induced voltage waveform and torque due to a current for one phase, a magnetic flux of a magnet.

FIG. 11 is a diagram showing an induced voltage waveform and torque due to a current for one phase and a magnetic flux of a magnet.

FIG. 12 is a diagram showing an induced voltage waveform and torque due to a current for one phase and a magnetic flux of a magnet.

FIG. 13 is a diagram showing a rotor of a third embodiment of the present invention, an application position of a sine wave current, and a magnet magnetic flux.

FIG. 14 is a diagram showing the relationship between the amount of current phase advance and Tm, Tr, and Tm + Tr in the third embodiment of the present invention.

FIG. 15 is a diagram showing another rotor structure and its simulation result in the third embodiment of the present invention.

FIG. 16 is a diagram showing another rotor structure and its simulation result in the third embodiment of the present invention.

FIG. 17 is a diagram showing another rotor structure according to the third embodiment of the present invention.

FIG. 18 is a diagram showing another rotor structure according to the third embodiment of the present invention.

FIG. 19 is a diagram showing another rotor structure according to the third embodiment of the present invention.

FIG. 20 is a sectional view of a magnet-embedded motor in a conventional example.

FIG. 21 is a current phase lead amount and Tm, Tr, and
Diagram showing the relationship with Tm + Tr

FIG. 22 is a diagram showing a relationship between total current and total magnetic flux.

FIG. 23 is a diagram showing the relationship between the maximum torque current phase and the amount of decrease in Tm in the conventional example.

[Explanation of symbols]

 106 1st magnet 108 2nd magnet 104 Magnet insertion hole 316 Notch 318 Air gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinari Asano 1006 Kadoma, Kadoma City, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A magnet-embedded motor having a plurality of permanent magnets inside a rotor core, a stator having a winding wound around the stator core, a rotor core, and a part or all of the stator core. A magnet for one pole disposed inside the rotor has an arc-shaped first magnet that follows the shape of the rotor cylindrical portion surface and a second magnet that is separated from the first magnet and has a different shape. An embedded magnet type motor, which is composed of a magnet. 2. The magnet-embedded motor according to claim 1, wherein the convex portion of the second magnet has an arcuate shape facing the rotary shaft side. 3. The magnet-embedded motor according to claim 1, wherein the second magnet has a substantially rectangular shape arranged in the radial direction. 4. A magnet-embedded motor having a plurality of permanent magnets inside a rotor core, the stator having a winding wound around the stator core, the rotor core, and the inside of the rotor. The magnet for one pole disposed in the first magnet having a substantially rectangular shape arranged from the vicinity of the surface of the rotor cylindrical portion to the vicinity of the surface of the rotor cylindrical portion is separated from the first magnet and has a different shape. A magnet-embedded motor comprising two magnets. 5. A magnet side surface on the circumferential side of the first magnet has an extension line of the two side surfaces intersecting with each other inside the center of the rotation axis in order to secure a magnetic flux passage. Magnet embedded motor. 6. The magnet-embedded motor according to claim 1, wherein a corner portion of the magnet on the rotation center side of the first magnet is cut by chamfering or the like to secure a magnetic flux passage. 7. A magnet-embedded motor having a plurality of permanent magnets inside a rotor core, a stator having a winding wound around the stator core, a rotor core, and a part or all of the rotor core. And a magnet disposed inside the rotor,
A magnet-embedded type in which the rotor core of the pole is provided with at least one of a gap, a notch, and a large magnet insertion hole for a magnet from the vicinity of the end of the pole toward the center of the pole. motor. 8. The rotor core for each one pole is provided with at least one of a gap, a notch, and a magnet insertion hole large with respect to a magnet in a portion opposite to the rotation direction of the rotor. The magnet-embedded motor according to claim 7. 9. An air gap such that the rotor core for each one pole has a magnetic resistance that increases toward the center of the pole from the vicinity of the end of the pole on the side opposite to the rotation direction of the rotor. 8. The magnet-embedded motor according to claim 7, wherein at least one large magnet insertion hole is provided for the notch, the notch, and the magnet. 10. A rotor core for one pole each has a magnetic flux cut on the surface of the cylindrical core portion on the side opposite to the rotation direction of the rotor by about 3% to 45% of the surface of the rotor core for one pole. The magnet embedded motor according to claim 7, wherein a notch is provided. 11. The magnet-embedded type according to claim 7, wherein a portion of the magnet insertion hole of the second magnet provided in the rotor core on the side opposite to the rotation direction of the rotor is larger than the magnet shape. motor. 12. The magnet-embedded motor according to claim 7, wherein the first magnet is moved in the rotational direction from the center of the magnetic pole.