JP2003009484A - Rotor of self-starting reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-starting reluctance motor capable of overcoming various problems. SOLUTION: The rotor 3 is provided with five layered flux barrier slits 4 for one pole opposed to a stator 1 which has 36 slots 2 formed therein and generates four poles of traveling magnet field. A secondary conductor 5 is formed from non-magnetic conductive material being injected into the flux barrier slits 4. In the cross section of the rotor 3, the entire outer periphery of the rotor 3 is divided equally into 44 parts, each 11 parts for one pole. The four layered flux barrier slits 4 of the five flux barrier slits 4 are formed so that each two outside positions of the eleven positions are connected in order, while the remaining one layered flux barrier slit 4, formed both in a magnetically non-salient pole direction and on the outer peripheral side, is so formed as to connect these three center position of the eleven positions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous motor utilizing reluctance torque, and particularly to a rotor for starting 2
The present invention relates to a reluctance motor that can be self-started by providing a secondary conductor (flux barrier), and more particularly to a structure of a rotor of a self-starting reluctance motor that can solve various problems.

[0002]

2. Description of the Related Art A so-called reluctance motor having a rotor with a magnetic salient pole structure and rotating in synchronization with a traveling magnetic field of a stator is generally known as a reaction motor or a synchronous reluctance motor. In recent years, the rotor has a multi-layer slit structure in order to maximize the magnetic salient poles, so that the motor is attracting attention as a high-efficiency motor superior to an induction motor.

However, since the reluctance motor having such a structure is a synchronous motor, it is necessary to control the current phase of the stator winding according to the rotor position, and it is generally driven by an inverter. On the other hand, as a starting method other than an inverter, for example, JP-A-11-146615
A method has been proposed in which a starting secondary conductor for induction is provided on a rotor, such as the motor described in the publication.

Further, in addition to this, as a problem in the conventional reluctance motor, when the slit arrangement is not properly selected, a torque ripple is generated during the synchronous operation, and the torque ripple resonates with the load. There was a problem that became a factor of. In this regard, the above-mentioned conventional example shows a method of reducing the torque ripple by applying rotor skew.

[0005]

In order to apply a reluctance motor having such a structure to a general industrial motor such as a fan, a pump, or a compressor which has conventionally been used as an induction motor, a voltage depending on the rotor position is applied. A method that uses an inverter for controlling is generally used. However, using an inverter not only increases the cost, but also causes a problem that the total efficiency is reduced due to the occurrence of inverter loss. Therefore, also in the reluctance motor having such a structure, like the induction motor, it is desirable to be able to operate at the rated speed without using an inverter, and it is desirable to be able to perform the synchronous operation by accelerating to the synchronous speed with a commercial power source.

On the other hand, Japanese Patent Laid-Open No. 11-146615, which is the above-mentioned conventional example, proposes a method of arranging a rod-shaped conductor in the vicinity of the outer periphery of the slit portion. In this way, a reluctance motor that enables induction start has been proposed, but the method of arranging such a rod-shaped conductor near the outer circumference of the slit part has a problem that there is a region where synchronous drawing cannot be performed due to load and inertia. Met. Reluctance motors that are operated asynchronously without being pulled in synchronously have large vibrations and low efficiency, and are not suitable for general industrial applications.

In particular, such a reluctance motor having a multi-layer slit structure has a problem that its pulling-in capability is deteriorated with respect to a load having a large inertia because the rotor has a high magnetic saliency. Further, if the self-starting reluctance motor is constructed with the same frame number as the induction motor, there is a problem that if the load inertia exceeds the same degree as the rotor inertia, it becomes difficult to synchronously pull in the rated torque load.

From these problems, even if the rod-shaped conductor is simply arranged in the vicinity of the outer periphery of the slit portion, its application range is limited to the use with relatively small inertia. Therefore, it is used as a motor directly driven by a commercial power source in general industry. However, there is a problem that it is difficult to apply it widely for commercial use.

Further, as a further problem when applying such a reluctance motor having a multi-layer slit structure as a motor for general work, there is compatibility between mass productivity and low vibration.

That is, in consideration of mass production, it is desirable from the viewpoint of cost to make the starting secondary conductor provided in the rotor by aluminum die casting. Considering the productivity at the time of die-casting, if the slit width is made minute, the pressure loss at the time of flowing the molten aluminum into the rotor becomes large and the mass productivity is lowered. Therefore, in reality, it is desirable that the number of slits that can be arranged in the rotor be small.

However, if the number of slits is small, the torque ripple becomes large due to the magnetic interaction between the stator slot and the rotor, and vibration noise is generated. In order to avoid this, in the above-mentioned conventional example, a method of adopting skew in the rotor is disclosed, but the magnetic saliency of the rotor is reduced, and further, the rotor surface portion is circumferentially arranged. There is a problem that the efficiency and power factor of the motor decreases due to loss due to eddy current flowing across the motor, so-called cross current loss.Therefore, it is necessary to use an induction-starting reluctance motor that has both mass productivity and vibration and efficiency and power factor. It has been difficult to obtain in the past.

The present invention has been made in order to solve such a problem, and even when it is manufactured in the same size as an induction motor, a commercial power source is directly connected to a load having an inertia larger than the rotor inertia. The purpose is to obtain all that self-starting is possible, while at the same time having a higher efficiency than an induction motor made of the same size and having a smaller torque ripple.

[0013]

A rotor of a self-starting reluctance motor according to the present invention comprises a stator core having 36 slots and a winding wound around the stator core in a three-phase winding. The flux barrier slit is provided so as to face a stator that generates a traveling magnetic field of four poles, and five layers of flux barrier slits are provided for one pole having a convex shape toward the center of the rotor. A rotor of a self-starting reluctance motor having a secondary conductor formed by injecting a non-magnetic conductive material into the rotor. The rotor has a cross-sectional shape in which the outer peripheral portion of the rotor is divided into 44 equal parts all around. At the position of 11 with respect to one pole, among the five layers of flux barrier slits, the four layers of flux barrier slits located on the rotor central axis side are arranged so that two positions outside the eleven positions are sequentially connected. The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the three central positions of the 11 positions, and the combined flux barrier is formed. The polar arc width angle of the slit is greater than or equal to a predetermined angle.

The rotor of the self-starting reluctance motor according to the present invention has a stator core formed with 48 slots and a winding wound around the stator core in a three-phase winding. It is provided so as to face a stator that generates a traveling magnetic field of a pole, and has a shape that is convex toward the center of the rotor.
A rotor of a self-starting reluctance motor having six layers of flux barrier slits provided for poles, a non-magnetic conductive material being injected into the flux barrier slits, and a secondary conductor being formed. The cross-sectional shape is such that the outer circumference of the rotor is divided into 56 equal parts over the entire circumference and 14 per pole.
At this position, among the six layers of flux barrier slits, the five layers of flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the two outer sides of the 14 positions, and The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the four central positions among the 14 positions, and the polar arc of the combined flux barrier slits. The width angle is equal to or larger than a predetermined angle.

The rotor of the self-starting reluctance motor according to the present invention has a stator core formed with 48 slots and a winding wound around the stator core in a three-phase winding. It is provided so as to face a stator that generates a traveling magnetic field of a pole, and has a shape that is convex toward the center of the rotor.
A rotor of a self-starting reluctance motor in which a seven-layer flux barrier slit is provided for a pole, and a non-magnetic conductive material is injected into the flux barrier slit to form a secondary conductor. The cross-sectional shape is such that the outer circumference of the rotor is divided into 56 equal parts over the entire circumference and 14 per pole.
At this position, among the seven layers of the flux barrier slits, the six layers of the flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the outer two positions among the fourteen positions, and The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to join the two central positions of the 14 positions, and the polar arc of the joined flux barrier slits. The width angle is equal to or larger than a predetermined angle.

The rotor of the self-starting reluctance motor according to the present invention has a stator core having 24 slots formed therein and a winding wound around the stator core in a three-phase winding. It has a concave shape with respect to the central direction of the rotor, which is provided so as to face the stator that generates the traveling magnetic field of the poles.
A rotor of a self-starting reluctance motor in which four layers of flux barrier slits are provided for the poles, and a non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. The cross-sectional shape is such that the outer circumference of the rotor is divided into 20 equal parts over the entire circumference and 10 parts per pole.
In this position, among the four layers of the flux barrier slits, the three layers of the flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the outer two positions among the ten positions, and The remaining one layer of flux barrier slits formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the four central positions among the ten positions, and the polar arc of the combined flux barrier slits. The width angle is equal to or larger than a predetermined angle.

The rotor of the self-starting reluctance motor according to the present invention has a stator core having 36 slots formed therein and a winding wound around the stator core in a three-phase winding. It has a concave shape with respect to the central direction of the rotor, which is provided so as to face the stator that generates the traveling magnetic field of the poles.
A rotor of a self-starting reluctance motor in which five layers of flux barrier slits are provided for the poles, and a non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. The cross-sectional shape is such that the outer circumference of the rotor is divided into 32 equal parts, and 16 parts per pole.
In this position, among the five layers of the flux barrier slits, the four layers of the flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the two outer sides of the 16 positions, and The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the central 8 positions of the 16 positions, and the polar arc of the combined flux barrier slits. The width angle is equal to or larger than a predetermined angle.

The secondary conductor is an aluminum conductor, and the distance between the end of the flux barrier slit and the outer periphery of the rotor is 0.35 mm or more and 0.5 mm or less.

Further, in the flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side so as to couple a plurality of positions, the coupling portion is concave with respect to the rotor outer periphery in sectional shape. Has retreated to.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 is a sectional view showing a stator core of a self-starting reluctance motor according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a rotor of a self-starting reluctance motor. In FIG.
In the stator core 1a of the stator 1 of this reluctance motor, 36 stator slots 2 are formed at equal intervals in the circumferential direction. A winding of three phases and four poles (not shown) is wound around each slot 2.

When the number of stator slots 2 of the motor shown in FIG. 1 is represented by Ns and the number of pole pairs is represented by P, Ns = 36 and P = 2. On the other hand, the rotor 3 shown in FIG. 2 has six slit layers.
It is a layer. Here, it has been discovered that it is necessary to satisfy the following four conditions (condition 1) to (condition 4) as conditions for selecting the optimum combination of the number of slits for the reluctance motor.

The order of the spatial harmonics of the magnetic flux density generated in the air gap is the same as that of the induction motor assuming that the order of the fundamental wave generated by the stator 1 is 1.

[0023]

[Equation 1]

It becomes On the other hand, the harmonic component generated by the rotor 3 peculiar to the synchronous reluctance motor is obtained as follows.

FIG. 2 shows a cross-sectional view of a plane perpendicular to the axial direction of the rotor 3 according to the present invention. Rotor 3 shown in FIG.
Is formed by laminating a plurality of thin electromagnetic steel plates on which arc-shaped slits 4 are formed as flux barrier slits, and then die-casting aluminum into each slit 4 to form a flux barrier for starting, that is, a secondary conductor 5. To do.

Although not shown, the secondary conductor 5 is short-circuited by an end ring as in a general induction motor. Here, if it is assumed that Nr magnetic irregularities generated in the gap by the slit 4 are generated around the outer circumference of the rotor 3, if the order of the fundamental wave generated by the stator 1 is 1, it is generated in the gap. The order of spatial harmonics

[0027]

[Equation 2]

[0028] At this time, the larger the least common multiple of M and N, the smaller the ripple component generated by the magnetic interaction between the stator and the rotor. On the contrary, when the least common multiple is 1, that is, when there is a combination in which the harmonics M = N, the torque ripple becomes large. From these (condition 1): it is desirable to select the least common multiple of M and N as large as possible.

As the next condition, it is desirable that Nr has the same structure for each pole in order to eliminate vibration due to asymmetry. Therefore, the number of slits must be a multiple of the number of poles. From this, (Condition 2): Nr / 2P is an integer.

As the next condition, as the number of layers of the slits 4 increases, the interval between the adjacent slits 4 becomes shorter.
Therefore, the spatial harmonic magnetic flux generated by the slot 2 of the stator 1 easily interlinks with the conductor of the rotor 3, and the harmonic 2
Next copper loss increases. In addition, the increase in the number of slits 2 causes an increase in the total creepage length of the press punched portion when the iron core 1a is formed by press punching. Therefore, the press pressure required for the press machine increases or the progressive press machine is used. In this case, since the number of processing steps of the press increases, the motor production facility becomes large-scale. Furthermore, after that,
As a peculiar issue in producing the secondary conductor 5 for starting by aluminum die casting, if the width of the slit 4 is narrow, pressure loss at the time of die casting of aluminum is large and the pressure required for die casting increases. Is significantly reduced. From these, (Condition 3): It is desirable that the number of slits is as small as possible.

As the next condition, the number of layers of the slit 4 as the flux barrier slit will be described below. A curve 6 in FIG. 3 shows a qualitative relationship between the number of layers of the slit 4 and the motor efficiency. Generally, when the number of layers of the slits 4 is increased under the condition that the total area of the slits 4 is constant, unnecessary magnetic flux components such as zigzag leakage magnetic flux are reduced, so that the invalid current is reduced and the motor efficiency characteristic is improved. Tends to do. The larger the number of layers, the greater the effect of reducing the leakage flux. However, in practice, the number of layers above a certain level is sufficient because the leakage flux is sufficiently reduced. A few k
In the W-class industrial motor, by setting the number of layers to about 5 or more, it is possible to secure high efficiency exceeding that of an induction motor made in the same size.

Next, consider the relationship between the number of slits 4 and Nr. Figure 4 shows the model for one pole. Considering the case where one slit 4 is provided as shown in FIG. 4, two magnetic irregularities 7 are formed per pole on the outer peripheral portions at both ends thereof, which causes harmonics. From this, when the slits 4 are arranged at the outer peripheral position at equal intervals in the circumferential direction, the relationship between the Nr-order higher harmonic magnetic flux due to the rotor and the number of layers L of the slits is expressed by Equation 3 and Equation 4 Shown in.

When Nr / 2P is an even number, as shown in FIG. 4, two magnetic irregularities are formed each time one layer is provided for each pole.

[0034]

[Equation 3]

[0035]

When Nr / 2P is an odd number, only a half of the slits 4 are magnetically roughened by being arranged in the vicinity of the outer peripheral portion like the slit 4 having a circular cross section located at the outermost periphery of the slit 4 in FIG. Will contain one 4, in which case

[0037]

[Equation 4]

[0038]

If L ≧ 5 is ensured so that the motor efficiency shown in the graph of FIG. 3 exceeds the range of the induction motor (condition 4-1): when Nr / 2P is an even number, Nr ≧ 5.
20P (Condition 4-2): When Nr / 2P is an odd number, Nr ≧
18P is required.

Under the constraints of the above (condition 1) to (condition 4), the stator shown in FIG. 1 is taken as an example to obtain (expression 1) and (expression 2).
The following is an embodiment of a combination in which the least common multiple of M and N is large.

First, in the motor shown in FIG. 1, Ns = 3
6, P = 2, so 19
It has second and 17th harmonic components. Therefore, as Nr that M and N are not equal and the least common multiple is increased, 44 and 2
8 is considered. However, since 28 does not satisfy the condition 4, 44 is selected as Nr. That is, if the basic structure is such that the end portion is arranged in the slit 4 near the position where the outer peripheral portion of the rotor is divided into 44 equal parts, a motor with reduced torque ripple can be obtained.

Therefore, the structure of the rotor (condition 4-
By means of 1) or (condition 4-2), the torque ripple can be reduced without skew for general industries such as pumps and compressors, so that there is no loss increasing due to skew and low torque ripple. It is possible to obtain an effect that a motor having both high efficiency and high efficiency can be obtained. Of course, if efficiency is sacrificed, it is needless to say that the structure of the present invention is additionally skewed to further reduce the torque ripple.

Considering a shape satisfying Nr = 44 as a specific rotor structure, a structure as shown in FIG. 2 can be considered as a rotor structure of a multilayer slit. But,
Since the synchronous pull-in ability is insufficient only with the structure shown in FIG. 2, it is necessary to improve the synchronous pull-in ability in order to widely apply it as an industrial motor. This will be explained below.

When the secondary conductor 5 formed by die-casting into the slit 4 as shown in FIG. 2 is combined with the stator 1 and started, the rotor 3 having the salient pole structure is replaced by the stator 1. Asynchronous to the traveling magnetic field. At this time, since the magnetic flux passing through the rotor 3 changes in size between the magnetic salient pole portion and the non-salient pole portion, the secondary conductor 5 of the rotor 3
The magnitude of the current flowing through it changes. From this fact, the current flowing through the secondary conductor 5 of the rotor 3 has two components, an antiphase and a positive phase.

The effect of this anti-phase component produces a positive torque when the slip is 0.5 or more and a negative torque when the slip is 0.5 or less, similarly to the Gergues phenomenon which is well known as a phenomenon of an induction motor. Therefore, in a state immediately before the synchronous pull-in with a small slip of about 0.1, the negative torque due to the anti-phase component becomes an impediment factor for the synchronous pull-in. Also stator 1
Also in the waveform of the current flowing through the winding, the amplitude value of the current changes depending on the rotor position as shown in FIG. 5 due to the salient pole structure of the rotor.

On the other hand, the positive phase component generates positive induction torque as in a normal induction motor due to the rotor sliding.

For the purpose of explaining the present invention, the torque generated by the motor at the time of starting is shown as a qualitative tendency by separating it into the inductive torque of the positive phase component and the torque of the negative phase component for convenience. Those shown in FIG. 6 are shown. A curve 8 in FIG. 6 is an average torque that the secondary conductor 5 of the rotor 3 acts as an induction motor, and a curve 9 in FIG. 6 is a torque component generated by the same mechanism as the Gerges phenomenon, and is negative when the slip is 0.5 or more. Since it becomes torque, it becomes a factor that hinders acceleration. The resultant force becomes acceleration torque 10 and is accelerated to a slip s that balances the load torque.

Then, the inertia J of the load connected to the motor
Thus, if the relationship between the slip S0 (J) and the slip s that can be synchronized is in the range of S0 (J)> s, the synchronized state is directly drawn. (The torque during synchronization is not shown in the figure). The synchronizable slip S0 depends on the inertia of the load connected to the motor. FIG. 7 shows the relationship between the load torque that can be synchronously pulled in and the load inertia as a qualitative tendency. As shown in the shaded area 11 in FIG. 7, when the moment of inertia of the load increases, the applicable load torque decreases.

Here, the reluctance motor of the multi-layer slit structure of the present invention has a remarkably high magnetic salient polarity as compared with a small salient pole type motor that performs induction starting known as a conventional reaction motor. Therefore, the current pulsation caused by the anti-phase component is also larger, and the slip is 0.5
The amount of negative torque generated in the above region increases and changes as shown in FIG. Therefore, the load torque T and the sliding s that balance with each other are large as s', and S0 (J)
Since it becomes <s', it cannot be synchronized. For this reason, as shown by the broken line 12 in FIG. 7, there is a wide area in which it cannot be pulled in, and although the characteristics at the time of synchronization are superior to those of the conventional reaction motor, it is difficult to bring in the synchronization when operating by commercial direct insertion. The applicable range of is narrowed.

The method of avoiding this pull-in in the present invention will be described below. First, by reducing the secondary resistance on the rotor side as much as possible, the characteristic of the induction torque shown by the curve 8 in FIG. 8 is changed to the low slip side as shown in FIG. 9 by the proportional transition law of the induction motor. Make a transition. As a result, the slippage in which the load torque and the induced torque balance each other is reduced from s'to s '', S0 (J)> s '', and the rotor speed approaches the synchronous speed, improving the synchronous pull-in characteristic. Even if a load having a large inertia equal to or more than that of the rotor requires the rated load torque, the synchronous pull-in is possible.

From the qualitative tendency shown above, it is understood that the pull-in can be improved by reducing the secondary resistance of the rotor 3. However, in the case of realizing the reduction of the secondary resistance by the actual rotor structure in the shape design of the actual rotor,
It is necessary to expand the cross-sectional area of the secondary conductor 5 in order to reduce the secondary resistance. That is, the slit 4 proposed in the present invention
In the rotor of the self-starting reluctance motor in which aluminum is die-cast to form the secondary conductor 5, it is necessary to increase the area of the slit 4 portion.

However, increasing the area of the slit 4 portion reduces the magnetic path cross-sectional area on the other hand. Therefore, when the slit 4 is extremely increased, the magnetic flux density of the magnetic path passing through the salient poles at the time of synchronization is increased. As a result, the magnetic field becomes higher and magnetic saturation occurs, and the efficiency and power factor of the motor decrease. As a result, the expansion of the synchronous pull-in range and the motor efficiency are contradictory design constraints in the design of the rotor shape, and therefore there is a problem that it is difficult to satisfy them both.

Therefore, in the present embodiment, the structure in which the arrangement of the rotor slit 4 and the magnetic circuit is compatible is shown in FIG.
0 is suggested. As shown in FIG. 10, the magnetic salient pole direction in which the magnetic flux of the rotor 3 easily passes is defined as the d-axis direction, and conversely, the non- salient pole direction in which the magnetic flux is less likely to pass by the flux barrier is defined as the q-axis direction. Focusing on the electromagnetic role division in the rotor 3, the magnetic flux density is the maximum amplitude phase, q
The magnetic flux density of the rotor core is high in the vicinity of the d-axis because it changes in a sine wave with the minimum amplitude on the axis. On the contrary, the magnetic flux density of the rotor core passing near the q-axis becomes low. On the other hand, when the magnetic flux interlinking each slit is considered, the amount of interlinking magnetic flux is larger in the slit located on the outer peripheral side of the rotor on the q axis.

Therefore, in the present embodiment, from the structure of the rotor 3 shown in FIG. 2, the slits 5A and 5B in this area are further connected so that a current path for starting flows in the magnetic path between them. The device is devised to have a slit shape such as 5c in FIG. 10 in which the current path cross-sectional area of the induced current of the rotor is enlarged. As in the structure of the rotor 3 shown in FIG. 10, connecting the slits in the q-axis direction to expand the cross-sectional area of the secondary conductor has the effect of lowering the resistance of the conductor portion that contributes to the induced torque. Further, although this reduces the magnetic path width in the q-axis direction, since the magnetic flux amount is originally small and the influence of magnetic saturation is small, there is almost no decrease in efficiency during synchronous operation. Further, since the magnetic flux density in the vicinity of the q axis is sufficiently small, the amplitude of magnetic pulsation of the rotor is small, and the vibration is not increased.

Therefore, the structure of FIG. 10 has an effect that the pulling-in characteristic can be improved without lowering the efficiency at the time of synchronization or increasing the vibration. As described above, it was shown that the insertion and the low vibration can be satisfied by the slit coupling at the q-axis position based on the structure with Nr of 44. The above is presented below as a generalized design range.

That is, in this embodiment, Nr = 44 is adopted in order to obtain the effect of reducing the torque ripple. Therefore, the interval between the slits is 360/44 = 8.
18 degrees apart. Here, by connecting two or more layers located on the inner peripheral side, the distance between the joined top positions in the rotor outer diameter portion is 8.18 × 2≈16 degrees because two layers are joined at the angle θ in FIG. Thus, the shape has a larger polar arc angle.

From the above, in the rotor 3 of the self-starting reluctance motor according to the present embodiment, the stator core 1a having the 36 slots 2 and the stator core 1a are wound in three phases. 5 layers of flux barrier slits 4 are provided for one pole having a wound winding and facing the stator 1 for generating a traveling magnetic field of four poles and having a convex shape toward the center of the rotor. A rotor 3 of a self-starting reluctance motor in which a non-magnetic conductive material is injected into the flux barrier slit 4 to form a secondary conductor 5, the rotor 3 having a cross-sectional shape of At the position where the outer peripheral portion of 3 is divided into 44 equally around the entire circumference and becomes 11 with respect to one pole, among the five layers of flux barrier slits 4, four layers of flux barrier slits 4 located on the central axis side of rotor 3 are formed. Is 1 Is formed so as to sequentially connect two positions outside each other, and the remaining one-layer flux barrier slit 4 formed magnetically in the non-salient pole direction and on the outer peripheral side is located at the center of 11 positions. Since the polar arc width angle of the combined flux barrier slits formed so as to connect the positions is approximately 16 degrees or more, there is an effect that productivity improvement and torque ripple reduction can both be achieved.

Embodiment 2. As a remaining problem, the harmonic magnetic flux generated by the slot 2 of the stator 1 as shown in FIG. 11 is linked to a part of the starting secondary conductor 5 of the rotor 3 as shown by an arrow 13 in FIG. This is because eddy current loss that occurs as a result, so-called harmonic secondary copper loss, occurs and this is one of the causes of lowering motor efficiency.

As an easy means for solving this problem,
The outer peripheral bridge portion δ, which is the distance between the end of the flux barrier slit 4 and the outer peripheral portion of the rotor 3 shown in FIG. 11, is thickened to keep away from the magnetic flux interlinking inside the rotor, and the iron core on the rotor surface. A possible method is to make a detour.

On the other hand, however, thickening the outer peripheral bridge portion δ increases the leakage magnetic flux in the outer peripheral portion of the rotor 3, especially the leakage magnetic flux of the q-axis component, so that Lq becomes large.
As an index indicating the power factor of a reluctance motor, generally, the ratio Ld / Lq of the inductance Ld in the d-axis direction and the inductance in the q-axis direction viewed from the stator 1 is called the salient pole ratio. In order to obtain a performance exceeding that of an induction machine in a reluctance motor having a multilayer slit structure, this salient pole ratio should be 5 to 10
It is required to be larger than that.

However, the outer peripheral bridge portion δ is made thick to make Lq
When the value increases, the salient pole ratio decreases significantly. As a result, the power factor decreases, the current flowing through the stator increases, the primary copper loss increases, and the efficiency decreases.

Therefore, regarding the thickness of the bridge portion δ, there is a contradictory relationship between the loss reduction due to the reduction of the harmonic secondary copper loss and the reduction of the primary copper loss. This relationship is shown in FIG.
Regarding the tendency of the bridge thickness and the loss, there is a tendency as shown by the curve 13 in FIG. 12, and regarding the decrease of the power factor, the bridge portion is magnetically saturated in the range where the bridge thickness δ is small, and Due to the deterioration of the magnetic properties due to processing deterioration, the primary copper loss does not decrease much due to the increase of the bridge thickness below 0.3 mm, but the primary copper loss increases with the increase of the bridge thickness from around 0.3 mm or more. 0.5
When it exceeds ~ 0.6 mm, it becomes difficult to obtain performance exceeding that of a general-purpose three-phase induction motor.

On the other hand, the higher harmonic copper loss decreases as the bridge thickness increases, as shown by the curve 14 in FIG. Since the loss is 13 + 14, there is an optimum value in the range of the bridge thickness of 0.35 to 0.48 mm. Designing in this range minimizes both the harmonic secondary copper loss and the primary copper loss. You get a loss of. Strictly speaking, this bridge thickness differs depending on the motor size, but in an industrial motor of a few kW class, it has approximately the same value.

From this, the rotor 3 of the self-starting reluctance motor proposed in the present embodiment has a peripheral bridge thickness of 0.35 in the rotor structure manufactured by die-casting aluminum into a multilayer slit structure. ~ 0.48mm
The degree. This has the effect of minimizing the loss caused by harmonics, and has the effect of increasing the efficiency of the motor.

As described above, in the self-starting reluctance motor rotor 3 of this embodiment, the distance δ between the end of the flux barrier slit 4 and the outer periphery of the rotor 3 is increased.
Is 0.35 mm or more and 0.5 mm or less. Therefore, the slot harmonic magnetic flux of the stator 1 is detoured by the iron core within a range that does not increase the leakage magnetic flux passing through the surface of the rotor 3 to suppress the amount of interlinking, and thus the outer peripheral surface of the secondary conductor 5 is chained. Higher efficiency motors can be achieved by reducing the secondary harmonic copper loss that occurs when they intersect.

Third Embodiment In the slit portion 5C coupled as shown in the first embodiment of the present invention, as shown in FIG. 13, the interlinkage of the leakage magnetic flux 15 due to the stator slot 2 becomes large, so that the harmonic secondary copper loss is other. It becomes larger than the slit of and becomes a problem.

On the other hand, as shown in the second embodiment of the present invention, the outer peripheral bridge thickness δ is 0.35 mm to
When it is about 0.45 mm, the amount of magnetic flux linkage is reduced and loss is reduced, and at the same time, as shown in FIG. This loss can be reduced by recessing the coupling portion 5Da to be coupled to the inner peripheral side in a concave shape so as to have a shape like 5D as a whole.

FIG. 15 is an enlarged view of the 5D shape. Providing two or more convex portions is indicated by arrow 16 in FIG.
As described above, since the iron core is magnetically saturated at the position indicated by 17 near the convex shape with respect to the magnetic path through which the ineffective leakage magnetic flux component of the rotor surface passes, the leakage magnetic flux becomes difficult to pass. This has the effect of reducing the leakage magnetic flux 16, and making the coupling portion 5Da concave makes it possible to bypass the leakage magnetic flux 15 due to the stator slot 2 interlinking with the rotor secondary conductor 5D to the iron core on the rotor surface. This has the effect of reducing the magnetic flux interlinking with the secondary conductor as much as possible to reduce the harmonic secondary copper loss. As a result, the effect that the motor efficiency can be increased to the limit is obtained.

As described above, in the rotor 3 of the self-starting reluctance motor of the present embodiment, the flux barrier magnetically formed in the non-salient pole direction and on the outer peripheral side is formed so as to couple a plurality of positions. In the slit 5D, the connecting portion 5Da is recessed in a concave shape with respect to the outer circumference of the rotor in the sectional shape. Therefore, by partially excluding the secondary conductor 5 at the position where the slot harmonic magnetic flux of the stator 1 invades, it is possible to reduce the harmonic secondary copper loss generated by interlinking with the outer peripheral surface of the secondary conductor, thus achieving high efficiency. It can be any motor. Even in this case, since the remaining convex portion is magnetically saturated, the leakage magnetic flux passing through the rotor surface portion is not increased, and the power factor reduction caused by the leakage magnetic flux is small.

Fourth Embodiment FIG. 16 shows a configuration in which the flux barriers of the rotor 3 of FIG. 2 shown in the first embodiment of the present invention are combined for three layers. Flux barrier coupling 3
Forming the secondary conductor 5E as shown in FIG. 16 as a layer increases the cross-sectional area of the secondary conductor, and therefore the rotor 3 is further provided than in the rotor structure of FIG. 10 or FIG. 14 in which two layers are combined. It is possible to reduce the secondary resistance of and to improve the ability of synchronous pull-in. In that case, the efficiency and power factor are slightly reduced, but the efficiency is almost the same as that of a general-purpose three-phase motor. Reluctance motors with a simple shape, such as the traditional reaction motors, are often used for textile machinery applications because they can easily perform group control even with a single control device, but have a considerably higher power factor than induction motors. Although there was a problem that the power supply capacity was inferior, the application of the motor as shown in FIG. 16 of the present invention can provide a reluctance motor having a power factor much higher than that of an induction motor. There is an effect.

Fifth Embodiment On the other hand, in a small 4-pole motor of the order of several kW, the stator slot number Ns is generally 36 or 48. Since the configuration example of the case of 4 poles and 36 slots has already been described above, an example of the case of 48 slots will be shown in this embodiment. The stator 1 shown in FIG. 17 has 48 slots, and a three-phase winding (not shown) is wound so as to generate a traveling magnetic field of four poles. In this embodiment, Ns = 48 and P = 2, and therefore, as the spatial frequency of the stator slot described above, if the fundamental wave component of the traveling magnetic field is the first order, M = ks (48/2 ± 1)
Next, spatial harmonics of the 25th order are generated.

20 or 28 is an appropriate value as N for obtaining a large least common multiple in combination with this, and a structure having 40 or 56 as a basic structure as Nr for realizing this is a structure advantageous for vibration reduction. Therefore, the number of flux barrier slits of 5 layers or 7 layers is selected. Even if a five-layer structure is used, appropriate performance can be obtained.
Considering that the slits at the axial position are connected, a seven-layer structure is preferable because the number of slit layers can be increased. From here, in order to obtain the effect of further improving the pull-in,
With the structure shown in FIG. 17 in which the slits near the axis are combined, both pulling and high efficiency can be achieved.

The following is presented as a generalized design range. In the structure of this embodiment shown in FIG. 17, Nr = 56 is adopted in order to obtain the effect of reducing the torque ripple. Therefore, the spacing between each slit is 360/56
= 6.42 degree intervals. Here, by connecting two or more layers located on the inner circumference side, the interval between the joined top positions in the rotor outer diameter portion is such that the angle θ in FIG. 17 is 6.42 × 3.
Since ≈20 degrees, the shape has a polar arc angle larger than this.

As described above, the rotor 3 of the self-starting reluctance motor according to the present embodiment is wound around the stator core 1a having the 48 slots 2 and the stator core 1a in three-phase winding. Six layers of flux barrier slits 4 are provided for one pole having a winding and facing a stator 1 that generates a traveling magnetic field of four poles and has a convex shape toward the center of the rotor. Flux barrier slit 4
A rotor 3 of a self-starting reluctance motor in which a non-magnetic conductive material is injected to form a secondary conductor 5. The rotor 3 has a cross-sectional shape such that the outer peripheral portion of the rotor 3 has the entire circumference. At the position where it is divided into 56 equal to 14 per pole, 6
Of the layer flux barrier slits 4, the five layer flux barrier slits 4 located on the central axis side of the rotor 3 are:
The remaining one-layer flux barrier slit formed in the non-salient pole direction magnetically and on the outer peripheral side is formed so as to sequentially connect two positions on the outer side out of the fourteen positions.
The pole arc width angle of the combined flux barrier slits formed so as to connect the four central positions among the 14 positions is approximately 20 degrees or more, so that high efficiency of the motor and reduction of torque ripple can be achieved at the same time. Is effective,
The pulling-in capability can be improved, and the loss caused by harmonics can be minimized.

Further, as a modification of the present embodiment, 1
Considering the case where seven layers of flux barrier slits 4 are provided for the poles, the cross-sectional shape of the rotor 3 is
Of the seven layers of flux barrier slits 4, the six layers of flux barrier slits 4 located on the side of the central axis of the rotor 3 are arranged such that the outer periphery of the rotor is divided into 56 equal to 14 and one pole is 14 , 14 out of the 14 positions are sequentially connected to each other, and the remaining one-layer flux barrier slit 4 formed magnetically in the non-salient pole direction and on the outer peripheral side is Since the pole arc width angle of the combined flux barrier slits 4 formed so as to connect the two central positions is 6 degrees or more, it is possible to achieve both high efficiency of the motor and reduction of torque ripple. In addition, the power factor of the motor is improved.

Sixth Embodiment In addition, in a small two-pole three-phase induction motor of about several kW class or less, the stator slot number Ns is generally 24 or 36. When Ns is 24, Ns = 24 and P = 1. Therefore, if the fundamental wave component of the traveling magnetic field is the first-order spatial frequency of the stator slot, M = ks (24/1 ±
From 1), spatial harmonics of the 23rd and 25th orders are generated.

20 or 28 has an appropriate value as N for obtaining a large least common multiple in combination with this, and a structure having 20 or 28 as a basic structure for Nr to realize this is a structure advantageous for vibration reduction. Therefore, vibration can be reduced by providing the number of flux barrier slits of 10 or 14 layers.

FIG. 18 shows a structure in which 10 layers with a small number of slits are selected from the condition 3 shown in the first embodiment of the present invention, and the slits near the q-axis are combined to improve pulling in. Invented.

The following is presented as a generalized design range. In the structure of FIG. 18 according to the present embodiment, Nr = 20 is adopted in order to obtain the effect of reducing the torque ripple. Therefore, the spacing between each slit is 360/20
= 18 degree intervals. Here, by joining two or more layers located on the inner peripheral side, the outer diameter portion of the rotor is joined. Therefore, the angle θ in FIG.
The shape has a polar arc angle larger than × 3 = 54 degrees.

As a modification of this embodiment, considering an example in which five layers of flux barrier slits 4 are provided for one pole, the cross-sectional shape of the rotor 3 is such that the outer peripheral portion of the rotor 3 is At a position where the entire circumference is divided into 20 equal to 10 for one pole, among the 5 layers of the flux barrier slits 4, the 4 layers of the flux barrier slits 4 located on the central axis side of the rotor 3 have 10 positions. Of the ten positions, the remaining one layer of the flux barrier slit 4 is formed so as to sequentially connect two positions on the outer side of each other and is magnetically formed in the non-salient pole direction and on the outer peripheral side. The pole arc width angle of the combined flux barrier slits formed to connect the positions is approximately 18 degrees or more, so that the harmonic secondary copper loss increases even in a motor with a high rotational speed such as a two-pole machine. To suppress It may be able to highly efficient motors.

Seventh Embodiment Further, in a 2-pole small motor of the order of several kW, the number of stator slots Ns is generally 24 or 36. When Ns is 36, Ns = 36 and P = 1. Therefore, the fundamental frequency component of the traveling magnetic field is 1 as the spatial frequency of the stator slot.
Given the following, M = ks (36/1 ± 1), 35, 37
The next order spatial harmonics are generated.

32 or 40 is an appropriate value for N to obtain a large least common multiple in combination with this, and a structure having 32 or 40 as a basic structure for Nr to realize this is a structure advantageous for vibration reduction. Therefore, the vibration can be reduced by providing the slit number of 16 layers or 20 layers.

In order to reduce the interlinkage magnetic flux of the stator with respect to the secondary conductor of the rotor, it is desirable to reduce the number of rotor slits to about 80% of the number of stator slits, so 16 layers are selected. Further, FIG. 19 is obtained as a structure in which slits near the q-axis are combined to improve pulling in.

The following is presented as a generalized design range. In the structure of FIG. 18 according to the present embodiment, Nr = 32 is adopted in order to obtain the effect of reducing the torque ripple. Therefore, the spacing between each slit is 360/32.
= 11.25 degree intervals. 2 located on the inner circumference side
Bonding in the rotor outer diameter portion by bonding layers or more. Therefore, the distance between the top positions is the angle θ in FIG.
Becomes a shape having a polar arc angle larger than 11.25 × 3≈34 degrees. Note that in FIG. 18, it is difficult to secure 8 layers per pole, so if the number of slits of 5 layers or more including the combined flux barrier can be secured, the efficiency equivalent to that of the induction machine can be obtained. The angle θ is 11.25 because the outer eight positions are joined together leaving four layers on the circumference side.
× 7 ≈ 79 degrees.

As an example of modification of the present embodiment, considering an example in which eight layers of flux barrier slits 4 are provided for one pole, the rotor 3 has a cross-sectional shape in which the outer peripheral portion of the rotor 3 is At the position where the entire circumference is divided into 32 equal parts and 16 per pole, among the eight layers of flux barrier slits 4, the seven layers of flux barrier slits 4 located on the side of the central axis of the rotor 3 have 16 positions. Of the 16 positions, the remaining one layer of the flux barrier slit 4 is formed so as to sequentially connect two positions on the outer side of each other and is magnetically formed in the non-salient pole direction and on the outer peripheral side. Since the pole arc width angle of the flux barrier slits 4 formed so as to connect the positions is approximately 11 degrees or more, it is possible to achieve both high efficiency of the motor and reduction of torque ripple without reducing productivity. There is an effect that.

Finally, when the rotor of the self-starting reluctance motor of the present invention is summarized, in the above-described first embodiment, Ns = 36 is selected and described. From the standpoint of productivity, it is better to use as few slots as possible. However, for example, if Ns = 24 and P = 2 in a 4-pole machine in which the number of slots is further reduced, the stator harmonics have 11th and 12th harmonic components. Therefore, 28 and 20 can be considered as Nr for making M and N not equal and increasing the least common multiple, but both do not satisfy the condition 4. Therefore, Ns = 36 described above has the effect of achieving both productivity and torque ripple reduction for a 4-pole machine.

When Ns = 48 is selected, Ns
The productivity is slightly reduced because the number of slots is increased compared to the case of = 36, but in the case of pursuing more efficiency, the efficiency is slightly increased as the number of rotor layers is increased. Ns = 60 can be considered as a combination more than this. However, the air gap diameter of a motor of several kW class is usually around 100 mm. Therefore, when Ns = 60, the slot pitch is about 5 mm and the slot opening width is about 2 mm. Considering workability at the time of inserting the winding, the slot opening width is significantly reduced unless it is about 2 to 3 mm. From the above, for a 4-pole machine, setting Ns = 48 has the effect of achieving both high efficiency and reduction of torque ripple while maintaining productivity.

On the other hand, when the two-pole machine is operated by being directly connected to a commercial power source, the number of revolutions is higher than that of the four-pole machine, and therefore slot loss of the stator causes more loss on the rotor surface than that of the four-pole machine. To do. Particularly, in the motor of the present invention, the rotor slit portion has two
Since the secondary conductor is filled, the stator harmonics interlink with the rotor conductor, which causes a lot of loss. When designing mainly for this loss, it is desirable that Ns> Nr. Assuming that Ns = 18, the stator harmonic has 17th and 19th harmonic components. So M and N
Is not equal and 1 is set as Nr that increases the least common multiple.
Although 4 and 22 are considered, Ns> Nr cannot be satisfied.
Therefore, setting Ns to 24 has an effect that even in a motor having a high rotational speed such as a two-pole machine, an increase in harmonic secondary copper loss can be suppressed and a highly efficient motor can be obtained.

Further, if Ns is 24, then 24
Since it is a multiple of 4 and 6, it is possible to share the production equipment required for stator production with 4-pole machines and 6-pole machines, which have a relatively large production volume, and a motor with higher productivity can be provided. The effect of being obtained is obtained.

When pursuing efficiency higher than Ns = 24, it is conceivable to increase Ns in order to increase the number of slits in the rotor. Therefore, next to 24, which can share production facilities with a 4-pole machine and a 6-pole machine, there are Ns = 36 and 48 as the largest Ns.

However, when Ns = 48 is selected,
A method of providing 20 layers with Nr = 40 slits is conceivable. However, in the case where the rotor diameter of a motor of about several kW is around 100 mm and the shaft penetrates in the center, the slits of 20 layers should be arranged. It is not practical because it requires very fine processing to realize it. Therefore, Ns = 36 has an effect that the highest efficiency and the torque ripple reduction can be compatible with each other while maintaining the productivity.

[0092]

As described above, in the self-starting reluctance motor having the rotor structure of the present invention, a high salient pole ratio can be obtained and the stator can be obtained at the same time by devising the structure of the bridge thickness and the multilayer slit. Since the secondary copper loss generated in the rotor of the starting conductor due to the harmonic magnetic flux generated by the slot is also reduced, it is possible to obtain higher efficiency than that of a general-purpose three-phase induction motor in conventional general industrial applications.

Further, even if a load having an inertia equal to or more than that of the rotor can be started by directly turning on the commercial power source by minimizing the decrease in the synchronous pull-in ability peculiar to the reluctance motor having a high salient pole ratio. Therefore, there is an effect that a frequency conversion device such as an inverter which is effective as in the past can be eliminated.

Further, since the torque ripple can be made small, there is an effect that there is little problem such as vibration due to the torque ripple.

Further, by having all of these effects, it is possible to widely apply the present invention as a motor having higher efficiency than a general-purpose three-phase induction motor of the same size even for general industrial applications which have been difficult in the past. is there.

The rotor of the self-starting reluctance motor according to the present invention has a stator core in which 36 slots are formed and a winding wound around the stator core in a three-phase winding. Five layers of flux barrier slits are provided for one pole having a convex shape with respect to the center direction of the rotor. A rotor of a self-starting reluctance motor in which a conductive material is injected to form a secondary conductor, wherein the rotor has a cross-sectional shape in which the outer peripheral portion of the rotor is divided into 44 equal parts with respect to one pole. 11
At this position, among the five layers of flux barrier slits, the four layers of flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the two positions outside of the position 11 and to the magnetic field. The remaining one-layer flux barrier slit formed in the non-salient pole direction and on the outer peripheral side is formed so as to connect the three central positions of the 11 positions, and the polar arc width angle of the combined flux barrier slits. Is greater than or equal to a predetermined angle. Therefore, it has the following effects. That is, (1) By using it for a 36-slot stator that is commonly used as a medium- and small-sized 4-pole general-purpose three-phase induction motor (up to 3 kW class), the production facility can be shared with the general-purpose three-phase induction motor. Therefore, it has excellent productivity. Further, a self-starting reluctance motor having all of the following features is obtained. (2) The number of slits in the rotor can be reduced as much as possible within a range where high efficiency can be maintained, and the productivity can be improved during iron core pressing and secondary conductor die casting. (3) Since the number of rotor slits is optimally selected, torque ripple can be reduced. (4) There is an effect that both the cross-sectional area and the magnetic path of the secondary conductor in which the slit coupling position is optimally selected can be secured and the load torque range that can be synchronously pulled in can be expanded without lowering the efficiency and power factor.

The rotor of the self-starting reluctance motor according to the present invention has a stator core in which 48 slots are formed and a winding wound around the stator core in a three-phase winding. It is provided so as to face a stator that generates a traveling magnetic field of a pole, and has a shape that is convex toward the center of the rotor.
A rotor of a self-starting reluctance motor having six layers of flux barrier slits provided for poles, a non-magnetic conductive material being injected into the flux barrier slits, and a secondary conductor being formed. The cross-sectional shape is such that the outer circumference of the rotor is divided into 56 equal parts over the entire circumference and 14 per pole.
At this position, among the six layers of flux barrier slits, the five layers of flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the two outer sides of the 14 positions, and The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the four central positions among the 14 positions, and the polar arc of the combined flux barrier slits. The width angle is equal to or larger than a predetermined angle. Therefore, it has the following effects. That is, (1) Small and medium-sized 4-pole general-purpose three-phase induction motor (up to 11 kW)
By using a 48-slot stator that is commonly used as a class), the production equipment can be shared with a general-purpose three-phase induction motor, resulting in excellent productivity. Then, a self-starting reluctance motor having all of the following features can be obtained. (2) The number of slits in the rotor can be reduced as much as possible within a range where high efficiency can be maintained, and the productivity can be improved during iron core pressing and secondary conductor die casting. (3) Since the number of rotor slits is optimally selected, torque ripple can be reduced. (4) The eddy current loss generated in the rotor non-magnetic conductor portion due to the slot harmonics of the stator can be reduced. (Number of stator slots> Rotor barrier x 2) (5) It is possible to secure both the cross-sectional area and the magnetic path of the secondary conductor with the slit coupling position optimally selected, and it is possible to pull in synchronously without lowering the efficiency and power factor. This has the effect of expanding the load torque range.

The rotor of the self-starting reluctance motor according to the present invention has a stator core having 48 slots formed therein and a winding wound around the stator core in a three-phase winding. It is provided so as to face a stator that generates a traveling magnetic field of a pole, and has a shape that is convex toward the center of the rotor.
A rotor of a self-starting reluctance motor in which a seven-layer flux barrier slit is provided for a pole, and a non-magnetic conductive material is injected into the flux barrier slit to form a secondary conductor. The cross-sectional shape is such that the outer circumference of the rotor is divided into 56 equal parts over the entire circumference and 14 per pole.
At this position, among the seven layers of the flux barrier slits, the six layers of the flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the outer two positions among the fourteen positions, and The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to join the two central positions of the 14 positions, and the polar arc of the joined flux barrier slits. The width angle is equal to or larger than a predetermined angle. Therefore, it has the following effects. That is, (1) Small and medium-sized 4-pole general-purpose three-phase induction motor (up to 11 kW)
By using a 48-slot stator that is commonly used as a class), the production equipment can be shared with a general-purpose three-phase induction motor, resulting in excellent productivity. Then, a self-starting reluctance motor having all of the following features can be obtained. (2) Since the number of rotor slits is optimally selected, torque ripple can be reduced. (3) Leakage magnetic flux is reduced and the power factor of the motor is improved by increasing the number of rotor slits. Therefore, the rated current is small, the Joule loss generated in the stator winding is small, and the motor can be made highly efficient. (4) There is an effect that both the cross-sectional area and the magnetic path of the secondary conductor in which the slit coupling position is optimally selected can be secured and the load torque range that can be synchronously pulled in can be expanded without lowering the efficiency and power factor.

The rotor of the self-starting reluctance motor according to the present invention has a stator core having 24 slots formed therein and a winding wound around the stator core in a three-phase winding. It has a concave shape with respect to the central direction of the rotor, which is provided so as to face the stator that generates the traveling magnetic field of the poles.
A rotor of a self-starting reluctance motor in which four layers of flux barrier slits are provided for the poles, and a non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. The cross-sectional shape is such that the outer circumference of the rotor is divided into 20 equal parts over the entire circumference and 10 parts per pole.
In this position, among the four layers of the flux barrier slits, the three layers of the flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the outer two positions among the ten positions, and The remaining one layer of flux barrier slits formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the four central positions among the ten positions, and the polar arc of the combined flux barrier slits. The width angle is equal to or larger than a predetermined angle. Therefore, it has the following effects. That is, (1) by using a 24-slot stator that is commonly used as a medium- and small-sized 2-pole general-purpose three-phase induction motor (up to 3 kW class), it is possible to share production equipment with a general-purpose three-phase induction motor. Excellent productivity. Then, a self-starting reluctance motor having all of the following features can be obtained. (2) The number of slits in the rotor can be reduced as much as possible within a range where high efficiency can be maintained, and the productivity can be improved during iron core pressing and secondary conductor die casting. (3) The eddy current loss generated in the rotor non-magnetic conductor portion due to the slot harmonics of the stator can be reduced. (Number of stator slots> rotor barrier × 2) (4) Since the number of rotor slits is optimally selected, torque ripple can be reduced. (5) There is an effect that both the cross-sectional area and the magnetic path of the secondary conductor in which the slit coupling position is optimally selected can be secured, and the load torque range that can be synchronously pulled in can be expanded without lowering the efficiency and power factor.

The rotor of the self-starting reluctance motor according to the present invention has a stator core having 36 slots and a winding wire wound around the stator core in a three-phase winding. It has a concave shape with respect to the central direction of the rotor, which is provided so as to face the stator that generates the traveling magnetic field of the poles.
A rotor of a self-starting reluctance motor in which five layers of flux barrier slits are provided for the poles, and a non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. The cross-sectional shape is such that the outer circumference of the rotor is divided into 32 equal parts, and 16 parts per pole.
In this position, among the five layers of the flux barrier slits, the four layers of the flux barrier slits located on the rotor central axis side are formed so as to sequentially connect the two outer sides of the 16 positions, and The remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to connect the central 8 positions of the 16 positions, and the polar arc of the combined flux barrier slits. The width angle is equal to or larger than a predetermined angle. Therefore, it has the following effects. That is, (1) by using a 36-slot stator that is commonly used as a medium- and small-sized 2-pole general-purpose three-phase induction motor (up to 3 kW class), it is possible to share production equipment with the general-purpose three-phase induction motor. Excellent productivity. Then, a self-starting reluctance motor having all of the following features can be obtained. (2) The number of slits in the rotor can be reduced as much as possible within a range where high efficiency can be maintained, and the productivity can be improved during iron core pressing and secondary conductor die casting. (3) The eddy current loss generated in the rotor non-magnetic conductor portion due to the slot harmonics of the stator can be reduced. (Number of stator slots> rotor barrier × 2) (4) Since the number of rotor slits is optimally selected, torque ripple can be reduced. (5) There is an effect that both the cross-sectional area and the magnetic path of the secondary conductor in which the slit coupling position is optimally selected can be secured and the load torque range that can be synchronously pulled in can be expanded without lowering the efficiency and power factor.

The secondary conductor is an aluminum conductor, and the distance between the end of the flux barrier slit and the outer periphery of the rotor is 0.35 mm or more and 0.5 mm or less. Therefore, it is generated by interlinking with the outer peripheral surface of the secondary conductor by suppressing the interlinking amount by detouring the slot harmonic magnetic flux of the stator with the iron core within a range that does not increase the leakage magnetic flux passing through the rotor surface. It is possible to reduce the harmonic secondary copper loss that occurs and to make a highly efficient motor.

Further, the flux barrier slits formed magnetically in the non-salient pole direction and on the outer peripheral side so as to couple a plurality of positions are concave in cross-sectional shape with respect to the rotor outer periphery. Has retreated to. for that reason,
By partially eliminating the secondary conductor at the position where the slot harmonic magnetic flux of the stator penetrates, it is possible to reduce the harmonic secondary copper loss generated by interlinking with the outer peripheral surface of the secondary conductor, and to achieve a highly efficient motor. . Even in this case, since the remaining convex portion is magnetically saturated, the leakage magnetic flux passing through the rotor surface portion is not increased, and the power factor reduction caused by the leakage magnetic flux is small.

[Brief description of drawings]

FIG. 1 is a sectional view showing a stator of a self-starting reluctance motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a rotor of the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a qualitative tendency of the number of layers of flux barrier slits and the motor efficiency of the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing the relationship between the flux barrier slits in the rotor of the self-starting reluctance motor according to the first embodiment of the present invention and the magnetic unevenness generated at the ends of the slits.

FIG. 5 is an explanatory diagram showing a current waveform of a stator at the time of starting the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating how torque is generated in the motor during start-up of the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram qualitatively showing an unpullable range according to the load inertia and the load torque of the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating a state of generation of torque inside the motor at the time of starting the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram illustrating how torque is generated inside the self-starting reluctance motor according to the first embodiment of the present invention when the motor is started.

FIG. 10 is a sectional view showing a rotor of the self-starting reluctance motor according to the first embodiment of the present invention.

FIG. 11 is an explanatory diagram illustrating how a loss occurs on a rotor surface of a self-starting reluctance motor according to a second embodiment of the present invention.

FIG. 12 is an explanatory diagram showing the relationship between the bridge thickness and the loss of the rotor of the self-starting reluctance motor according to the second embodiment of the present invention.

FIG. 13 is an explanatory diagram for explaining how loss occurs on the rotor surface of the self-starting reluctance motor according to the second embodiment of the present invention.

FIG. 14 is a sectional view showing a rotor of a self-starting reluctance motor according to a third embodiment of the present invention.

FIG. 15 is an explanatory diagram illustrating how a loss occurs on a rotor surface of a self-starting reluctance motor according to a third embodiment of the present invention.

FIG. 16 is a sectional view showing a self-starting reluctance motor according to a fourth embodiment of the present invention.

FIG. 17 is a sectional view showing a self-starting reluctance motor according to a fifth embodiment of the present invention.

FIG. 18 is a sectional view showing a self-starting reluctance motor according to a sixth embodiment of the present invention.

FIG. 19 is a sectional view showing a self-starting reluctance motor according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 stator, 1a stator core, 2 stator slots,
3 rotors, 4 slits (flux barrier slits), 5, 5A, 5B, 5C, 5D, 5E secondary conductors,
6 Efficiency characteristic curve, 7 Magnetic irregularities, 8, 9, 10
Torque characteristic curve, 11,12 Intractable range, 13,14 Loss curve, 15,16 Leakage magnetic flux, 1
7 Magnetic saturation point.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kunio Mori             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Michio Nakamoto             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Norihiro Achiwa             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5H002 AA01 AA09 AB08 AE06                 5H619 AA01 AA07 BB01 BB06 BB24                       PP02 PP04 PP15

Claims (7)

[Claims] 1. A stator core having 36 slots, and a winding wound around the stator core in a three-phase winding, the stator core facing a stator generating a 4-pole traveling magnetic field. 5 layers of flux barrier slits are provided for each pole having a convex shape toward the center of the rotor. A non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. A rotor of a self-starting reluctance motor that is formed, wherein the rotor has a cross-sectional shape in which the outer peripheral portion of the rotor is 4
Among the five layers of the flux barrier slits, the four layers of the flux barrier slits located on the rotor central axis side at the position of 11 divided into four equal parts are the above-mentioned ones.
The remaining one layer of the flux barrier slit is formed so as to sequentially connect two positions on the outer side of the first position and is magnetically formed in the non-salient pole direction and on the outer peripheral side.
A rotor for a self-starting reluctance motor, which is formed so as to connect three positions at the center of position 1, and the polar arc width angle of the combined flux barrier slits is not less than a predetermined angle. 2. A stator core having 48 slots, and a winding wound around the stator core in a three-phase winding, the stator core facing a stator generating a traveling magnetic field of four poles. 6 layers of flux barrier slits are provided for one pole having a convex shape toward the center of the rotor, and a non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. A rotor of a self-starting reluctance motor that is formed, wherein the outer peripheral portion of the rotor has a cross-sectional shape of 5
Among the six layers of the flux barrier slits, the five layers of the flux barrier slits located on the rotor central axis side at the position of being divided into six and having 14 positions for one pole are the above-mentioned ones.
Among the four positions, the remaining one layer of the flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to sequentially connect the two positions on the outer sides among the four positions. A rotor for a self-starting reluctance motor, which is formed so as to connect four central positions, and a polar arc width angle of the combined flux barrier slits is not less than a predetermined angle. 3. A stator core having 48 slots formed therein, and a winding wound around the stator core in a three-phase winding, the stator core facing a stator generating a four-pole traveling magnetic field. 7 layers of flux barrier slits are provided for one pole having a convex shape toward the center of the rotor, and a non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. A rotor of a self-starting reluctance motor that is formed, wherein the outer peripheral portion of the rotor has a cross-sectional shape of 5
Among the 7 layers of flux barrier slits, the 6 layers of flux barrier slits located on the rotor central axis side are divided into 6 equal parts and 14 for 1 pole.
Among the four positions, the remaining one layer of the flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to sequentially connect the two positions on the outer sides among the four positions. A rotor of a self-starting reluctance motor, which is formed so as to connect two central positions, and a polar arc width angle of the combined flux barrier slits is equal to or larger than a predetermined angle. 4. A stator core having 24 slots and a winding wound around the stator core in a three-phase winding, the stator core facing a stator generating a two-pole traveling magnetic field. 4 layers of flux barrier slits are provided for one pole having a concave shape with respect to the center direction of the rotor. A non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. A rotor of a self-starting reluctance motor that is formed, wherein the rotor has a cross-sectional shape in which the outer peripheral portion of the rotor has an entire circumference of 2
Among the four layers of the flux barrier slits, the three layers of the flux barrier slits located on the rotor central axis side at the position where the number of poles is divided into 0 and becomes 10 with respect to one pole is as follows.
Among the 10 positions, the remaining one-layer flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side is formed so as to sequentially connect the two positions of the outside of the 0 position. A rotor for a self-starting reluctance motor, which is formed so as to connect four central positions, and a polar arc width angle of the combined flux barrier slits is not less than a predetermined angle. 5. A stator core having 36 slots formed therein, and a winding wound around the stator core in a three-phase winding, the stator core facing a stator generating a two-pole traveling magnetic field. 5 layers of flux barrier slits are provided for one pole having a concave shape with respect to the center direction of the rotor. A non-magnetic conductive material is injected into the flux barrier slits to form a secondary conductor. A rotor of a self-starting reluctance motor that is formed, wherein the rotor has a cross-sectional shape in which the outer peripheral portion of the rotor has an entire circumference of 3
Among the five layers of the flux barrier slits, the four layers of the flux barrier slits located on the rotor central axis side at the position of being divided into two equal parts and having 16 positions for one pole are
The remaining one layer of flux barrier slits formed magnetically in the non-salient pole direction and on the outer peripheral side while being formed so as to sequentially connect the outer two positions out of the six positions A rotor for a self-starting reluctance motor, wherein the pole arc width angle of the combined flux barrier slits is formed so as to connect the eight central positions, and is more than a predetermined angle. 6. The secondary conductor is an aluminum conductor, and the distance between the end of the flux barrier slit and the outer periphery of the rotor is 0.35 mm or more and 0.5 mm or less. The rotor of the self-starting reluctance motor according to any one of claims 1 to 5. 7. The flux barrier slit formed magnetically in the non-salient pole direction and on the outer peripheral side so as to couple the plurality of positions, the coupling portion is concave with respect to the rotor outer periphery in sectional shape. The rotor of a self-starting reluctance motor according to any one of claims 1 to 5, wherein the rotor is recessed in shape.