JP2003061283A - Rotor and stator of dynamo-electric machine, and motor, compressor, and freezing cycle, and method of manufacturing rotor of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type of dynamo-electric machine which can perform the improvement of drive properties at start and operation, the prevention of demagnetization of a permanent magnet, the increase of efficiency, and the reduction of noise. SOLUTION: This device is equipped with a columnar rotor core 3 the center of which a rotary shaft pierces, a permanent magnet embedding hole 18 which is made at this rotor core 3 so that the end in axial direction may form an opening, an end plate 5 which is provided at the end in axial direction of the rotor core 3, and a platingless permanent magnet 12 which is inserted into the permanent magnet embedding hole 18. The interior of the permanent magnet embedding hole 18 is kept airtight to outside air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a permanent magnet type rotary electric machine in which a rotor core is provided with a permanent magnet.

[0002]

2. Description of the Related Art In recent years, in order to improve the performance of electric motors, highly efficient permanent magnet type DC brushless motors whose rotation speed is easily controlled and whose loss is reduced are widely used. FIG. 20 is a sectional view of a rotor of a conventional general permanent magnet type electric motor. 20, (a) is a plane cross-sectional view of the rotor,
(B) is a side sectional view of the rotor. FIG. 21 is a sectional view showing a three-phase four-pole DC brushless motor incorporating the rotor shown in FIG. 20, and the structure will be described below. Figure 21
In FIG. 1, 1 is a rotary shaft, 2 is a permanent magnet embedded in a rotor core 3 fitted to the rotary shaft 1, and 4 is formed on the side of the permanent magnet 3 to prevent short circuit of magnetic flux at the end of the permanent magnet. The flux barriers 5 are end plates that fix the permanent magnets 2 at the ends of the rotor core 3. Reference numeral 14 denotes a rotor configured by fitting and fixing a rotor core 3 in which a permanent magnet 2 is embedded in a rotating shaft 1. Reference numeral 15 is a stator in which a rotor 14 is inserted through an air gap 16, and a coil 8 is wound around a slot 17 formed between the teeth 13. In general, the permanent magnets 2 are arranged and fixed inside a cylindrical rotor core 3 having the rotating shaft 1 so that N poles and S poles alternate.

With the above structure, when the coil 8 wound around the stator 15 is energized by a drive circuit (not shown), the coil 8 generates a magnetic flux according to the supplied current. This magnetic flux acts on the rotor 14 via the air gap 16, and the permanent magnet 2 included in the rotor 14 rotates by repeatedly repelling or attracting depending on the polarity of the magnetic field due to this magnetic flux.

FIG. 22 is a sectional view showing a conventional permanent magnet type rotary electric machine disclosed in Japanese Patent Laid-Open No. 11-4555. In FIG. 22, the permanent magnet type rotary electric machine has a rotor 14
And a stator 15, and the stator 15 is composed of a stator core 7 and a stator coil 8. The rotor 14 is divided in the rotation direction of the rotor 14, and the conductive permanent magnets 2 formed of a unit magnet group having a magnet width τ _m1 are arranged so as to have polarities different from each other in the circumferential direction. That is, a conductive permanent magnet composed of a unit magnet group having N / S polarity and a conductive permanent magnet composed of a unit magnet group having S / N polarity were formed on the rotor core 3. The rotor 14 is formed by being inserted into the permanent magnet embedding hole 18.

FIG. 23 is a partial perspective view showing a rotor structure of a conventional permanent magnet type rotary electric machine disclosed in Japanese Patent Laid-Open No. 2000-209797. In FIG. 23, permanent magnets 2a to 2n form a magnet for one pole, each of which has the same size and is composed of electrically insulated permanent magnets. Since Nd-Fe-B magnets are rustproof, the magnets alone may be coated with, for example, epoxy paint. In this conventional example, this coating is used to electrically insulate and suppress eddy currents.

FIG. 24 is a sectional side view (a) showing a conventional electric motor disclosed in Japanese Patent Laid-Open No. 9-140107.
It is a plane sectional view. In FIG. 24, 31a, 31b,
31c is a cylindrical core having two salient poles 37a to 37c, 32a, 32b and 32c are insulators that insulate the core, 33a, 33b and 33c are coils wound around the respective salient poles, and 34a, 34b and 34c are A magnet having N and S2 magnetic poles, 35 is a spacer 36 is a shaft,
Reference numeral 40 is a topped cylindrical frame case, 38 is a bracket, 39a and 39b are bearings, 41 is a substrate for terminal connection, and 42 is a terminal pin integrally fixed to the insulator.

As shown in FIG. 24, in the rotor portion, hollow cylindrical magnets 34a, 34b, 34c sandwich a spacer 35, and the inner cylindrical portion of each magnet 34a, 34b, 34c is inserted and fixed to a shaft 36. One end 36 of the bearing 3 mounted on the frame case 40
9a, the other shaft end is bracket 3
The inner rotor has a double-sided support structure supported by a bearing 39b attached to the shaft 8. Also, the core 31
The a, 31b, and 31c are formed by stacking silicon steel plates in the thrust direction by press molding, and are insulated by resin insulators 32a, 32b, and 32c. The cores 31a, 31b, 31c are connected in series with three positioning pins formed by projecting a part of the insulators 32a, 32b, 32c as a reference, and are inserted and fixed in the inner circumference of the frame case 40, and the terminals are fixed. A board 41 for connecting the coils 33a, 33b, 33c is fixed to the pin 42 by soldering. A bracket 38 to which a bearing 39b is fixed is inserted and fixed to the opening of the frame case 40.

[0008]

The structure of the conventional permanent magnet type electric motor configured as described above has the following problems. The permanent magnet type electric motor arranged near the surface of the rotor causes an eddy current due to the magnetic field formed by the stator depending on the operating condition, resulting in performance deterioration.
Under the operating conditions of high rotation and high load, the permanent magnet becomes high temperature, and there is a problem that the performance is greatly deteriorated and the permanent magnet is demagnetized.

Further, when the permanent magnet is arranged near the surface of the rotor, there is concern about the strength reliability at high rotation.

Further, in the electric motor in which the permanent magnet is embedded inside the rotor core (close to the center), there is a problem that vibration and noise of the electric motor are large.

The present invention was carried out in order to solve the above-mentioned problems, and to improve driving characteristics at the time of starting and running, to prevent demagnetization of permanent magnets, to improve efficiency and to reduce noise. It is an object of the present invention to provide a permanent magnet type rotating electric machine capable of performing the above. Another object of the present invention is to obtain a compressor and a refrigeration cycle that have good controllability, a wide operating range, high efficiency, and low noise.

[0012]

A rotor of a permanent magnet type rotary electric machine according to the present invention is a permanent magnet without plating.

Further, a cylindrical rotor core having a rotary shaft passing through the center thereof, a permanent magnet embedding hole formed in the rotor core so that an end portion in the axial direction is an opening, and the permanent magnet embedding It is provided with a platingless permanent magnet inserted into the hole, and an end plate that closes the opening and holds the permanent magnet embedding hole in an airtight state.

In the method of manufacturing a rotor for a rotary electric machine according to the present invention, a step of unsealing a container sealed in an antioxidant state to take out a platingless permanent magnet, and a permanent magnet embedding hole formed in the rotor core. And a step of closing the permanent magnet embedding hole in an airtight state after the insertion, and these steps are performed in a temperature and humidity environment that prevents or slows down the oxidation of the platingless permanent magnet. .

In addition, a step of opening the container sealed in an antioxidant state to take out the platingless permanent magnet, a step of inserting the platingless permanent magnet into a permanent magnet embedding hole formed in the rotor core, and The step of shielding the platingless permanent magnet from the outside air is performed, and each of these steps is performed in a temperature and humidity environment that prevents or slows down the oxidation of the platingless permanent magnet.

The rotor of the rotary electric machine according to the present invention is a rotor of a permanent magnet type rotary electric machine in which a permanent magnet is divided and embedded in the rotor core or the permanent magnet is arranged near the surface of the rotor core. The divided permanent magnets are insulated from each other or the permanent magnets and the end plates are insulated from each other.

Further, in a rotor of a permanent magnet type rotary electric machine in which a permanent magnet is divided and embedded in the rotor core or the permanent magnet is arranged near the surface of the rotor core, the permanent magnet and the rotor core are insulated. Is.

Further, an arc-shaped permanent magnet is arranged near the surface of the rotor core, and the permanent magnet is magnetized in the radial direction.

Further, the permanent magnet embedding hole which is continuously or intermittently bent and formed along the rotation direction of the rotor and the pole arrangement is the same in the centrifugal direction with the bent portion of the permanent magnet embedding hole interposed therebetween. A plurality of embedded permanent magnets on a flat plate having a pseudo radial orientation are embedded.

The permanent magnet embedding hole is formed intermittently along the direction of rotation of the rotor, and the permanent magnet is embedded in the permanent magnet embedding hole leaving a flux barrier hole. is there.

Further, the flux barrier hole is provided with a permanent magnet positioning member made of a non-magnetic and non-conductive material.

Further, the permanent magnet embedding hole is provided with a plurality of permanent magnets separated from each other by the repulsive force of the magnets.

Further, a bridge is formed between the flux barrier hole and the permanent magnet.

Further, the edges of the permanent magnet embedding holes are rounded to form flux barrier holes.

Further, a bridge is formed between the permanent magnets adjacent to each other in the circumferential direction with the same pole arrangement in the centrifugal direction.

Further, in a rotor of a 6-pole DC brushless motor using a rare earth magnet as the permanent magnet, the position where the permanent magnet is embedded is expressed by α = distance from rotor outer diameter to permanent magnet / (rotor outer diameter) ² × If it is 100, the position is such that α ≦ 0.6.

Further, a thin portion or a flux barrier hole for suppressing the short circuit of the magnetic flux due to the permanent magnet is formed, and the distance between the permanent magnets of different poles through which the q-axis magnetic flux passes is made equal to or more than the thickness of the permanent magnet. .

Further, the stator of the rotating electric machine according to the present invention comprises a coil made of a divided rod such as a copper rod.

Further, the rotor is divided into a plurality of parts in the rotation axis direction, and each is independently selected and controlled by the control circuit.

Further, an electric motor according to the present invention includes the rotor according to any one of the above and the stator according to any one of the above.

The compressor according to the present invention includes the above electric motor as a driving electric motor.

Further, the refrigeration cycle apparatus according to the present invention comprises a compressor, a condenser, a throttle device, and an evaporator, and the refrigeration cycle apparatus in which these are connected by a refrigerant pipe is provided with the compressor.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is an example of a rotor of a rotary electric machine showing a first embodiment of the present invention.
Is a plan sectional view, and (b) is a side sectional view. In the figure, 1 is a rotary shaft, 3 is a cylindrical rotor core having the rotary shaft passing through the center, and 5 is a permanent magnet 12 described later.
An end plate for fixing at the axial end portion of, and 9 is an arrow indicating the magnetization direction of the permanent magnet 12, which is a parallel direction here. 12 is a permanent magnet embedding hole 1 formed in the rotor core 3
A platingless rare earth permanent magnet embedded in 8 and a rotor 14 composed of these. Permanent magnet embedding hole 18
As shown in FIG. 1 (a), is divided and formed in the vicinity of the surface of the rotor core 3 along the outer peripheral shape of the rotor core.

FIG. 4 shows the relationship between the magnet temperature and the driving time and the relationship between the magnetic flux amount and the driving time of an electric motor equipped with a rotor having a rare earth magnet of the conventional plating specification and the platingless specification under the same driving condition. It is the correlation diagram which showed. Thus, as the driving time of the electric motor elapses, a large temperature difference occurs in the magnet temperature between the plating specification and the platingless specification. Further, it is understood that the reduction of the amount of magnetic flux can be suppressed by making the permanent magnet platingless. Further, by adopting the platingless specification, it is possible to obtain a larger amount of magnetic flux than the plating specification even in the same temperature condition.

FIG. 5 is a correlation diagram showing the relationship between the motor efficiency and the motor rotation speed of an electric motor equipped with a rotor having a rare earth magnet of a plating specification and a platingless specification. As can be seen from the comparison between ● and ▲ in FIG. 5, the platingless specification can prevent the motor efficiency from being lowered due to the increase in the motor rotation speed as compared with the plating specification. This is because an eddy current can be reduced, heat generation of the magnet can be suppressed, and a highly efficient electric motor can be realized. The plating materials shown here are (1) copper + nickel (undercoat copper, then nickel) or
(2) Aluminum is used.

Conventionally, the surface of the permanent magnet was plated to prevent the magnet from being oxidized and corroded in a hot and humid environment. However, as described above, the plating causes an increase in magnet temperature and a decrease in the amount of magnetic flux. Motor efficiency will drop. In the present embodiment, the permanent magnet 12 is inserted into the permanent magnet embedding hole 18 under a temperature / humidity environment where the performance of the rotor is not degraded by the permanent magnet 12, and the end plate 5 is hermetically sealed. Thus, it is possible to prevent performance degradation due to oxidation of the permanent magnet during and after assembly.

The platingless permanent magnet 12 oxidizes in the air, and particularly in the case of a rare earth magnet, the oxidation is remarkable. Therefore, if the end plate 5 closes the opening of the permanent magnet embedding hole 18 at the axial end, the interior of the permanent magnet embedding hole 18 can be kept airtight. It is possible to prevent the oxidation of. In this case, the temperature and humidity environment of the assembly work site is controlled. The temperature should not be too high compared to room temperature, and the humidity should be kept as low as possible.
It suffices to prevent oxidation of the permanent magnet 12 or to prevent deterioration of the performance of the rotor assembly.

Under such a working environment, the permanent magnet 12 is housed and the container such as a bag or a box sealed in an antioxidant state is opened and the permanent magnet 12 is taken out. The taken out permanent magnet 12 is inserted into the permanent magnet embedding hole 18, and after insertion, the opening of the permanent magnet embedding hole 18 is closed by the end plate 5 to keep the inside of the permanent magnet embedding hole 18 airtight. After that, even if the rotor 14 is exposed to hot and humid air, the permanent magnet 12 can be prevented from being oxidized.

When the rotor 14 of the present embodiment is applied to the compressor motor constituting the refrigeration cycle, the inside of the compressor is shut off from the outside air when the compressor is in a completed state. In such a case, even after the permanent magnet 12 is inserted into the permanent magnet embedding hole 18 in the working space where the temperature and humidity are controlled as in the case described above, the temperature and humidity are controlled until the step of assembling the compressor, and the inside of the compressor is controlled. If the air is shut off from the outside air, the permanent magnet 12 can be prevented from being oxidized even after the compressor is exposed to hot and humid air.

Furthermore, if the permanent magnet 12 is coated in advance with a non-magnetic and non-conductive coating material such as glass or an epoxy-based organic paint, oxidation can be prevented without controlling temperature and humidity. The temperature rise and the decrease in the amount of magnetic flux due to the above-mentioned plating specification permanent magnet can be reduced, and the influence of eddy current can be prevented. When a permanent magnet with a coating specification is used for a compressor motor that constitutes a refrigeration cycle, it is necessary to have resistance to a refrigerant, and it is preferable to use a glass coat or an epoxy-based organic paint. In particular, since the epoxy-based organic coating has a thicker film than plating and glass, the distance between the permanent magnet and the core becomes large. The glass coat is more advantageous in terms of gaining the amount of magnetic flux.

The rotor core 3 is made of a high magnetic permeability non-oriented silicon steel sheet having a relatively small iron loss, and the thickness of the non-oriented silicon steel sheet is 0.25 mm to 0.5 mm. Incidentally, a grain-oriented or bi-directional silicon steel sheet may be used. A rare earth magnet is used as the permanent magnet 12, but the rare earth magnet has a great advantage of the present invention because it is oxidized quickly, and the permanent magnet may be a ferrite magnet or another magnet. The permanent magnet 12 may be magnetized externally and then inserted into the rotor core 3, or the unmagnetized permanent magnet may be inserted into the rotor core 3 and then magnetized together with the rotor. In the present embodiment, a four-pole rotor has been described as an example, but the present invention is not limited to four poles.

According to the above-described first embodiment, by making the permanent magnets plating-free, it is possible to suppress a decrease in the amount of magnetic flux of the permanent magnets and to realize a highly efficient permanent magnet type electric motor at low cost. Further, heat generation of the motor can be suppressed, and a highly reliable electric motor that prevents demagnetization of the permanent magnet can be realized. Furthermore, since it is not plated, it has good recyclability.

Embodiment 2. Embodiment 2 of the present invention will be described below with reference to the drawings. 2 is an example of a rotor showing a second embodiment of the present invention, (a) is a plan sectional view,
(B) is a side sectional view. In FIG. 2, 10 is provided between the plating specification permanent magnets 2 which are divided in the rotation axis direction or the circumferential direction of the rotor 14, and polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate is provided. It is a non-conductive, non-magnetic, heat-resistant, and refrigerant-resistant insulating film 10 such as a rate (PBT). The insulating film 10 may be provided between the divided permanent magnets 2 in both the rotation axis direction and the circumferential direction of the rotor 14, or may be provided on either one. The other configurations are similar to those of the first embodiment, and the description thereof will be omitted.

With the above-mentioned structure, the permanent magnet type rotating electric machine is used by dividing and inserting the permanent magnet 2 into a plurality of permanent magnet embedding holes for reasons of magnet manufacture or reduction of eddy current. In, contact between the permanent magnets 2 and the end plate 5
It prevents the eddy current from increasing due to a short circuit. If the insulating film 10 is used in a refrigerant such as a rotor used in a compressor motor for a refrigeration cycle, it is preferable to select a refrigerant resistant material. The permanent magnet 2 may be divided in the axial direction and the circumferential direction.

FIG. 5 is a correlation diagram showing the relationship between the motor efficiency and the motor rotation speed in an electric motor having a rotor with and without insulation between the permanent magnets 2. As can be seen from the comparison between □ and ▲ in FIG. 5, the insulation between the magnets increases the motor efficiency, and it is possible to suppress a decrease in the motor efficiency particularly at high rotation speeds. If the permanent magnet 2 is replaced with a plating-less permanent magnet of the present embodiment and a plating-less rare earth or other permanent magnet is used,
In Fig. 5, the motor efficiency is further improved compared to the non-plating permanent magnet without magnet insulation shown in Fig. 5. In this case, in the magnet assembling process, the same temperature / humidity control as in the first embodiment is performed.

According to the second embodiment described above, the permanent magnet 2
By insulating the gaps from each other, the eddy current of the permanent magnet is suppressed, and a low-cost and highly efficient rotary electric machine can be easily realized. Further, heat generation of the motor can be suppressed, and a highly reliable permanent magnet type rotary electric machine that prevents demagnetization of the permanent magnet can be realized.

Embodiment 3. Embodiment 3 of the present invention will be described below with reference to the drawings. Third Embodiment FIG. 3 is an enlarged plan sectional view of a rotor showing a third embodiment of the present invention. In FIG. 3, 10 is provided between the surface of the permanent magnet 2 of the plating specification and the rotor core 3, and is made of polyethylene terephthalate (PE
T), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), etc. are non-conductive, non-magnetic, heat resistant, and refrigerant resistant insulating films 10. If the insulating film 10 is used in a refrigerant such as a rotor used in a compressor motor for a refrigeration cycle, it is preferable to select a refrigerant resistant material. The permanent magnet 2 may be divided in the axial direction and the circumferential direction. The other configurations are similar to those of the first embodiment, and the description thereof will be omitted.

FIG. 5 is a correlation diagram showing the relationship between motor efficiency and motor rotation speed in an electric motor having a rotor with and without insulation between the surface of the permanent magnet 2 and the rotor core 3. is there. As can be seen from the comparison between ◯ and ▲ in FIG. 5, insulating the surface of the permanent magnet 2 from the rotor core 3 increases the motor efficiency, and it is possible to suppress the decrease in the motor efficiency particularly at high rotation speeds. If the insulating film 10 as in the second embodiment is provided between the permanent magnets 2, the motor efficiency is further improved.

If the permanent magnet 2 is replaced with a plating-specific permanent magnet in this embodiment and a plating-less specification rare earth or other permanent magnet is used, there is no insulation between the surface of the permanent magnet and the rotor core in FIG. Motor efficiency is further improved compared to the non-plating permanent magnet of. Further, if the insulating film 10 as in the second embodiment is provided between the platingless permanent magnets, the motor efficiency is further improved. In this case, in the magnet assembling process, the same temperature / humidity control as in the first embodiment is performed.

According to the third embodiment described above, the permanent magnet 2
By insulating the surface and the rotor core 3 from each other, the eddy current of the permanent magnet can be suppressed, and a low-cost and highly efficient rotating electric machine can be realized. Further, heat generation of the motor can be suppressed, and a highly reliable permanent magnet type rotary electric machine that prevents demagnetization of the permanent magnet can be realized.

Fourth Embodiment Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. 6 is an enlarged sectional plan view of a rotor showing a fourth embodiment of the present invention. In FIG. 6, 2 is a shape along the peripheral surface of the cylindrical rotor core 3, which is a tile-shaped permanent magnet arranged near the surface of the peripheral surface,
It is magnetized in the radial direction. The permanent magnet 2 may be divided in the axial direction and the circumferential direction as in the first to third embodiments, and is divided into four in the circumferential direction in the present embodiment. In addition, even with the platingless specification as in the first embodiment,
The plating specifications as in Embodiments 2 and 3 may be used. In this embodiment, a rare earth magnet is used as the material. Other configurations are the same as those in the first embodiment, and the description thereof will be omitted.

Since the permanent magnet 2 arranged near the surface of the rotor core is located near the stator, the magnet temperature is likely to rise under the influence of the eddy current. Especially in rare earth magnets, the volume resistivity is not so different from that of iron, which has a great influence. As a result, the magnet temperature rises as the driving time elapses. In order to reduce the influence of the eddy current, it is sufficient to dispose a permanent magnet near the rotating shaft and secure a long distance from the stator, but in this case, noise and vibration occur. In this embodiment, the permanent magnets 2 are arranged near the surface of the rotor core 3 with the magnetization direction of the permanent magnets 2 in the radial direction, so that the efficiency of the rotor 14 itself is improved. Can be made smaller.

According to the fourth embodiment described above, the permanent magnet 2
By magnetizing in a radial orientation, it is possible to realize a permanent magnet type rotating electric machine with high efficiency, low noise, low vibration and good controllability without increasing the cost.

Embodiment 5. Embodiment 5 of the present invention will be described below with reference to the drawings. 7 is an enlarged plan sectional view of a rotor showing a fifth embodiment of the present invention. In FIG. 7, reference numeral 18 denotes a permanent magnet embedding hole that is formed by continuously bending along the rotation direction of the rotor 14 (the circumferential direction of the rotor core 3), and in this embodiment, is bent in two steps in the circumferential direction. The two bent portions 18 a connect the three planar holes 18 b to form one permanent magnet embedding hole 18. The bent portion 18a does not have to be continuous, and a plurality of planar holes interrupted in the circumferential direction may be bent at the interrupted portion.

Reference numeral 2 is a parallel-oriented and flat plate-shaped permanent magnet 2 embedded in each planar hole 18b. The pole arrangement of SN is the same in the centrifugal direction in the same permanent magnet embedding hole 18, which is pseudo. It is arranged so as to have a radial orientation. In addition, the permanent magnets 2 have the permanent magnet embedding holes 18 adjacent to each other.
Then the pole placement is reversed. Other configurations are the same as those of the fourth embodiment, and the development such as the permanent magnet having the plating specification or the platingless specification is the same as that of the fourth embodiment, and the description thereof will be omitted.

In this embodiment, the permanent magnets 2 are arranged near the surface of the rotor core 3 in the permanent magnet embedding hole 18 with the magnetizing direction of the permanent magnets 2 in a pseudo radial direction. Therefore, as in the case of the fourth embodiment. The efficiency of the rotor 14 itself is improved, and the effect of eddy current can be reduced as compared with the conventional case if the rotor 14 has the same ability.
Further, since the permanent magnet 2 can be magnetized in a parallel orientation close to the radial orientation, a permanent magnet type with high efficiency, low noise, low vibration and good controllability can be obtained without increasing the cost as compared with the fourth embodiment. A rotating electric machine can be realized.

Sixth Embodiment Embodiment 6 of the present invention will be described below with reference to the drawings. FIG. 8 is an enlarged plan view of a rotor showing a sixth embodiment of the present invention. In FIG. 8, 18 is a permanent magnet embedding hole that is intermittently formed along the rotation direction of the rotor 14 (the circumferential direction of the rotor core 3), and 2 is a permanent magnet embedded in the permanent magnet embedding hole. . In the present embodiment, the distance between the adjacent permanent magnet embedding holes 18 is made as small as 0.25 mm to 1 mm so that the magnetic flux of the permanent magnets 2 is not short-circuited in the rotor core 3. Then, the permanent magnet 2 is inserted in the center of the permanent magnet embedding hole 18 in the circumferential direction over a width of about two-thirds, and the void portions formed on both sides of the permanent magnet embedding hole 18 in the circumferential direction are filled with the flux barrier hole 4. It is what

The permanent magnet 2 is fixed by providing a permanent magnet positioning portion 19 with a core in the permanent magnet embedding hole 18. Except for the permanent magnet positioning portion 19, the depth dimension inside the permanent magnet embedding hole 18 is the same. In addition, in FIG.
However, the number of contacts is not limited to four. Other configurations are the same as those of the fourth embodiment, and the development such as the permanent magnet having the plating specification or the platingless specification is the same as that of the fourth embodiment, and the description thereof will be omitted. Further, the permanent magnets may be pseudo-radially arranged as in the fifth embodiment.

In the arrangement of the permanent magnets 2, by inserting the permanent magnet 2 into a part of the permanent magnet embedding hole 18, as compared with the case where the permanent magnet 2 is inserted into the entire permanent magnet embedding hole 18,
The magnetic flux saturation of the rotor core 3 and the stator core 7 can be suppressed.
Further, since rare earth magnets are expensive materials, cost performance can be improved by reducing the amount of permanent magnets. By inserting the permanent magnet 2 into a part of the permanent magnet embedding hole 18, it is possible to provide a low-cost, high-efficiency, low-noise, permanent-magnet type rotary electric machine having a wide operating range. Then, the permanent magnet 2 is not inserted in a portion where demagnetization is likely to occur, so that demagnetization can be avoided.

Embodiment 7. Hereinafter, a seventh embodiment of the present invention will be described with reference to the drawings. FIG. 9 is an enlarged plan sectional view of a rotor showing a seventh embodiment of the present invention. In FIG. 9, reference numeral 18 denotes a permanent magnet embedding hole which is intermittently formed in the rotation direction of the rotor 14 (the circumferential direction of the rotor core 3), and both circumferential ends of the planar hole are bent toward the centrifugal direction. The bent sides of the adjacent permanent magnet embedding holes 18 are parallel to each other. Reference numeral 20 is a non-magnetic and non-conductive permanent magnet positioning member that is filled in the flux barrier hole 4 in the permanent magnet embedding hole 18 and fixes the permanent magnet 2 at a predetermined position in the permanent magnet embedding hole 18. Other configurations are similar to those of the sixth embodiment,
Further, the expansion of the permanent magnet to the plating specification or the platingless specification is the same as in the sixth embodiment, and the description thereof will be omitted.

The permanent magnet positioning member 20 is made of polyethylene terephthalate (PET) or polyethylene naphthalate (PET).
By using a heat-resistant and body-refrigerant substance such as EN) or polybutylene terephthalate (PBT), it can be easily mounted on a compressor motor used in a refrigeration cycle. By using the permanent magnet positioning member 20,
There is a degree of freedom in the circumferential dimension, and the circumferential dimension of the permanent magnet 2 can be changed according to various models. According to the seventh embodiment described above, the same effect as that of the sixth embodiment can be obtained, and further, since the dimension of the permanent magnet 2 in the circumferential direction can be changed, highly efficient permanent magnet type rotation corresponding to various models. An electric machine can be realized.

Embodiment 8. Embodiment 8 of the present invention will be described below with reference to the drawings. 10 is an enlarged plan sectional view of a rotor showing an eighth embodiment of the present invention. Figure 10
In the rotating direction of the rotor 14 (rotor core 3
Permanent magnet embedding holes formed intermittently along the
Reference numeral 2 is a permanent magnet embedded in the permanent magnet embedding hole. In the present embodiment, the permanent magnet 2 is circumferentially divided and inserted into the permanent magnet embedding hole 18, so that the positioning member 20 or the like is not used to fix the permanent magnet 2 and the permanent magnets 2 are repulsed. The position is fixed by force. The flux barrier holes 4 are formed between the permanent magnets 2 generated by the repulsive force. Other configurations are the same as those of the sixth embodiment, and the development such as the permanent magnets having the plating specification or the platingless specification is the same as that of the sixth embodiment, and the description thereof will be omitted.

According to the above configuration, the same effect as that of the sixth embodiment can be obtained, and further, the permanent magnet fixing portion 19 and the like need not be configured to fix the permanent magnet 2, and the circumference of the permanent magnet 2 can be obtained. Since the dimension in the direction can be changed, it is possible to realize a highly efficient permanent magnet type rotary electric machine that is compatible with multiple specifications at low cost.

Ninth Embodiment Embodiment 9 of the present invention will be described below with reference to the drawings. 11 is an enlarged plan sectional view of a rotor showing a ninth embodiment of the present invention. Figure 11
In the figure, 11 is a bridge provided between the permanent magnet 2 and the flux barrier hole 4. Other configurations are the same as those of the sixth embodiment, and the development such as the permanent magnets having the plating specification or the platingless specification is the same as that of the sixth embodiment, and the description thereof will be omitted. The circumferential width of the bridge 11 is mainly determined by the strength of the bridge to withstand the centrifugal force of the permanent magnet 2 and the core punching technique. Current,
In the case of mass-produced permanent magnet type motors, the one with the smallest bridge width is 0.5 mm and is rotated up to 120 S ^-1 . Regarding the formation of the bridge 11, when the permanent magnet 2 is arranged near the surface of the rotor core 3, the rotor core can be technically punched out up to about 0.35 mm, which is the same as the thickness of the core.
Generally, the bridge is set to about 0.5 mm to 2 mm.

The shape of the sixth embodiment shown in FIG. 8 is strong enough to withstand centrifugal force and the like, but in consideration of an abnormal situation, the reliability of rigidity can be improved as compared with FIG. . With such a configuration, it is possible to realize a strong rotor 14 that can maintain high efficiency and can withstand the centrifugal force of the permanent magnet 2 and the rotor core 3 in an electric motor that is driven up to a high rotation speed of 90 S ^-1 or more. With the above configuration, the same effects as those of the above-described sixth embodiment can be obtained, and further, it is possible to realize a highly reliable, highly efficient and low noise permanent magnet type rotating electric machine that can be driven up to high rotation.

Tenth Embodiment Embodiment 10 of the present invention will be described below with reference to the drawings. FIG. 12 is an enlarged plan sectional view of a rotor showing a tenth embodiment of the present invention.
In FIG. 12, 18 is a permanent magnet embedding hole that is intermittently formed along the rotation direction of the rotor 14 (the circumferential direction of the rotor core 3), and 2 is a permanent magnet embedded in the permanent magnet embedding hole. . In the present embodiment, in order to prevent the magnetic flux of the permanent magnet 2 from being short-circuited in the rotor core 3, the distance between the adjacent permanent magnet embedding holes 18 is set to be 0.25 mm to 1 m at the shortest part.
It is made as small as m, and the edges of the adjacent permanent magnet embedding holes 18 are rounded.

Then, the permanent magnet 2 is inserted into the permanent magnet embedding hole 18
The flux barrier hole 4 is a void portion which is inserted into the center in the circumferential direction over a width of about two-thirds and is continuously formed on both sides in the circumferential direction of the permanent magnet embedding hole 18. Since the magnet is restricted from moving in the circumferential direction, the inner and outer peripheral surfaces of the flux barrier hole 4 are slightly displaced from the inner and outer peripheral surfaces of the permanent magnet embedding hole 18 in the centrifugal direction. Other configurations are similar to those of the sixth embodiment,
Further, the expansion of the permanent magnet to the plating specification or the platingless specification is the same as in the sixth embodiment, and the description thereof will be omitted. By rounding the edges of the permanent magnet embedding holes 18 in an electric motor driven to a high speed, it is possible to prevent stress concentration on the edges and to prevent the rotor core 3 from withstanding the centrifugal force of the permanent magnets 2 and the rotor core 3. Increases strength, smoothes the flow of magnetic flux and suppresses iron loss increase.

According to the above-mentioned structure, the same effect as that of the sixth embodiment can be obtained, and further, the core strength can be increased and a highly efficient and highly reliable permanent magnet type rotating electric machine can be realized.

Eleventh Embodiment Embodiment 11 of the present invention will be described below with reference to the drawings. 13 is an enlarged plan sectional view of a rotor showing an eleventh embodiment of the present invention.
In FIG. 13, reference numeral 2 denotes a permanent magnet which is arranged near the surface of the rotor core 3 and is divided in the circumferential direction with the same pole arrangement in the centrifugal direction. In the present embodiment, the pole arrangement is reversed every two poles. . Reference numeral 11 is a permanent magnet 2 whose pole arrangement is the same pole or different poles.
It is a bridge between them. Other configurations are the same as those in the seventh embodiment, and the development such as the permanent magnet having the plating specification or the platingless specification is the same as that of the seventh embodiment, and the description thereof will be omitted.

With the above structure, the bridge 11 is provided between the permanent magnets 2 having the same pole arrangement, so that the rigidity of the rotor 14 is improved. As a result, it is possible to realize a strong rotor 14 capable of withstanding the centrifugal force of the permanent magnet 2 and the rotor core 3 while enabling low noise and low vibration in an electric motor driven to a high rotation speed of 90 S ^-1 or higher. . According to the above configuration, it is possible to realize a highly reliable permanent magnet type rotary electric machine that can be driven up to a high rotation speed and has high reliability, low noise and low vibration.

Twelfth Embodiment Embodiment 12 of the present invention will be described below with reference to the drawings. 14 is an enlarged plan sectional view of a rotor showing a twelfth embodiment of the present invention.
This embodiment is a 6-pole DC using a rare earth magnet as a permanent magnet.
With respect to the brushless motor, the position of the permanent magnet embedded in the rotor core is defined. Since the structure of the rotor is the same as that of the seventh embodiment shown in FIG. 9, the description thereof will be omitted.
The rotor shape is not limited to the seventh embodiment.

FIG. 15 is a correlation diagram showing the relationship between the position α of the permanent magnet 2 and the average torque under the conditions where the volume of the permanent magnet is constant, the number of turns of the coil, and the current value are constant. Here, α is α = (distance 1 from rotor outer diameter to permanent magnet) / (rotor outer diameter r) ² × 100. For such α, the average torque increases as α increases until α = 0.4, and the average torque decreases as α increases. Then, at α = 0.6, the average torque decreases to a value almost equal to that at α = 0.03. Where α ≈ 0.03
Is a value when roof tile-shaped permanent magnets are arranged along the peripheral shape near the surface of the rotor core. That is, if α ≦ 0.6, even if the permanent magnet 2 is a flat plate magnet, a rotor having an average torque similar to the case where the tile-shaped permanent magnets are arranged can be obtained, and the flat plate magnet can be set to α ≦ 0.6. If the motor is divided in the circumferential direction with a length that satisfies the condition (1), an electric motor with high motor efficiency can be realized.

In the present embodiment, a non-oriented silicon steel sheet of high magnetic permeability having a relatively small iron loss is used for the rotor core 3, and the thickness of the non-oriented silicon steel sheet is set to 0.25 mm to 0.5 mm. still,
A grain-oriented or bi-directional silicon steel sheet may be used. The permanent magnet 2 may be magnetized outside and then inserted into the rotor core 3, or after the unmagnetized permanent magnet is inserted into the rotor core 3, the rotor may be magnetized together. According to the above configuration, it is possible to realize a permanent magnet type rotating electric machine that is highly efficient, low cost, and excellent in cost performance.

Thirteenth Embodiment The thirteenth embodiment of the present invention will be described below with reference to the drawings. 16 is an enlarged plan sectional view of a rotor showing a thirteenth embodiment of the present invention.
In FIG. 16, the permanent magnet embedding hole 18 forms a flux barrier hole 4 whose end faces the centrifugal direction, and the end face forms a thin portion 3 a with the surface of the rotor core 3. Then, while suppressing the short circuit of the magnetic flux of the permanent magnet 2 in the thin portion 3a, the distance between the adjacent permanent magnet embedding holes 18 in which the permanent magnets having the opposite pole arrangement with respect to the centrifugal direction are embedded is widened, and q of this portion is increased.
It improves the flow of magnetic flux along the axis (direction perpendicular to the magnetic flux), increases reluctance torque, and improves motor efficiency. The distance between the permanent magnet embedding holes 18 is set to be equal to or greater than the thickness of the permanent magnet 2 in the centrifugal direction, and is generally 0.35 mm to 2 mm.

Generally, the torque T is expressed by the equation 1.       T = Pn {Ψa + (Ld−Lq) id} iq (Equation 1) Pn: number of pole pairs Ψa: Magnetic flux from a permanent magnet Ld, Lq: d-axis (magnetic flux direction), q-axis inductance id, iq: d-axis and q-axis components of motor current

From the equation (1), since the permanent magnet 2 exists in the magnetic path in the d-axis direction, Ld <Lq holds. By making iq negative, the torque can be increased. Here, since the magnetic path in the q-axis direction is only on the outer diameter side of the rotor core 3, the magnetic flux in the q-axis direction is easily magnetically saturated. Therefore, adjacent permanent magnet embedding holes 1 are formed while forming a thin portion that suppresses a short circuit of magnetic flux.
The torque is improved by increasing the distance between the permanent magnet 8 and the permanent magnet embedding hole 18, improving the flow of the q-axis magnetic flux, and avoiding magnetic saturation. Further, the thin portion that suppresses the short circuit of the magnetic flux may have a structure that suppresses the short circuit of the magnetic flux with a slit or the like.

According to the above construction, it is possible to realize a permanent magnet type rotary electric machine which secures rotor strength, has low noise and low vibration, and is highly efficient.

Fourteenth Embodiment Hereinafter, a fourteenth embodiment of the present invention will be described with reference to the drawings. 17 is a side view of a stator showing a fourteenth embodiment of the present invention. In FIG. 17, 6 is a copper rod, which is a U-shaped member 6a whose one side is open.
And an I-shaped member 6b connected to two ends of the U-shaped member 6a, and by connecting them, an O-shaped member is formed. Insulating portions 6c and 6d are formed on one of the connecting surfaces of the U-shaped member 6a and the I-shaped member 6b, respectively. Then, one of the wirings is connected to the U-shaped member 6a, and the other is I
It is connected to the character-shaped member 6b. The copper rod 6 thus configured corresponds to a coil. Reference numeral 7 denotes a stator core, which has the same sectional shape as that shown in FIG. Other configurations of the stator are the same as those in FIG. 21, and the configuration of the rotor is the configuration of any one of the above-described first to fourteenth embodiments, and the description thereof will be omitted. The rotor may have a conventionally known configuration.

When the copper rod 6 is assembled, the parallel rod portions of the U-shaped member 6a pass through the slots 17 so that the teeth 13 are sandwiched, and then the I-shaped member 6b is crimped, soldered, crimped, welded, etc. The two ends of the U-shaped b-shaped material 6a are connected to each other by a predetermined method such as pressure bonding, soldering, caulking, and welding to form an O-shape. At the time of connection, the insulating portions 6c and 6d are aligned with each other to bring the connected portion into an insulating state and the other connecting portion into a conductive state. Then, by connecting one of the wirings to the vicinity of the insulating portion 6c of the U-shaped member 6a and connecting the other to the vicinity of the insulating portion 6d of the I-shaped member 6b, the current inlet and outlet are respectively U-shaped members. 6
a and the I-shaped member 6b. In FIG. 17, the connecting direction between the U-shaped member 6a and the I-shaped member 6b is the vertical direction, and the contact direction between the U-shaped member 6a and the teeth 13 is the vertical direction. I-shaped member 6b
Adhesion does not change significantly depending on the degree of connection with.

With the configuration of the copper rod 6 and the manufacturing method of the stator 7 as described above, the manufacturing process of the stator 7 can be simplified, and the productivity can be improved and the cost can be reduced. Further, by improving the coil space factor, copper loss can be reduced and motor efficiency can be improved. In the present embodiment, the coil occupancy rate is almost 1
It has been improved to 00%. The copper rod 6 may be flat and may be laminated insulatively in the radial direction. Further, the copper rod is applicable to both concentrated winding in which a coil is wound around each tooth and distributed winding in which a coil is wound over a plurality of teeth. According to the above configuration, the manufacturing process is simplified and automated,
A highly efficient rotating electric machine can be realized with improved productivity and cost reduction.

Fifteenth Embodiment The fifteenth embodiment of the present invention will be described below with reference to the drawings. Fifteenth Embodiment FIG. 18 is a side view of an electric motor showing a fifteenth embodiment of the present invention. In FIG. 18, 14 is a rotor having the configuration according to any of the above-described first to 13th embodiments, and 15 is a stator, which has the same structure as that shown in FIG. 21, and the details of both the rotor and the stator are shown. Description is omitted. The stator 15 is rotated in the rotation axis direction (see FIG.
It is configured so that a stator to be driven can be selected and controlled according to driving conditions such as load and rotation speed. Reference numeral 30 is a control circuit for independently selecting and rotating each of the plurality of divided stators 15. Further, in this embodiment, the permanent magnets of the rotor 14 form a skew in the circumferential direction in units of the stator divided in the axial direction.

When the number of stators and rotors is one, the current or voltage can be controlled according to the driving conditions such as the load and the number of rotations, but the points of good efficiency are limited.
In order to widen the operating range (range of the number of revolutions), there is no choice but to expand to an inefficient area. In the above configuration, the stator 15 is divided in the rotation axis direction, and each can be independently selected and controlled by the control circuit. Therefore, while the operating range of each stator 15 is narrowed, the total operating range is wide. Can be secured.

That is, by selecting and driving a part of the plurality of stators 15 when the load is small, each stator 15 can be driven as compared with the case where all the stators are energized and driven.
The energization amount of becomes large. When the load is large, by driving all of the plurality of stators 15, the energization amount of each of the stators 15 becomes smaller than that when a part of the stators is energized and driven. The number of the stators 15 selected to be energized may be appropriately stored in the control circuit 30 by previously storing the relationship between the load and the efficiency and detecting the load. Although the electric motor in this embodiment is a three-phase motor, other motors may be used.

According to the above-mentioned structure, the rotor to be driven is selected and controlled according to the driving conditions such as the load and the number of rotations, so that it is possible to realize a permanent magnet type rotary electric machine with high efficiency and a wide operating range. Further, since the rotor can form a skew, it is possible to realize a low-noise, low-vibration permanent-magnet-type rotating electric machine. still,
When the skew in the permanent magnet type rotor is not easy to manufacture, the stator may be shifted in the circumferential direction for each stage to add the skew.

Sixteenth Embodiment FIG. 19 shows a rotor according to any one of the first to thirteenth embodiments and the first embodiment.
It is a conceptual diagram which shows the refrigerating-cycle apparatus provided with the compressor which mounts the electric motor using the stator described in any one of 4 thru | or 15. In FIG. 19, reference numeral 21 denotes an electric motor, which is a three-phase motor driven by an inverter by a main inverter circuit 22. 23 is a compressor driven by the electric motor 21;
Reference numeral 0 is a control circuit that controls the electric motor 21 through the inverter 22.

This compressor 23 is a refrigerating cycle generally used (compressor 23 → four-way valve 25 → condenser 26 or evaporator 28 → throttle device 27 → evaporator 28 or condenser 26 → four-way valve 25 → compressor 23 Refrigeration cycle sequentially connected by the refrigerant pipe 29), and the refrigerant is R1.
HFC represented by 34a, R410a, R407c, etc.
As the refrigerating machine oil, a weakly compatible oil represented by alkylbenzene series oil or a compatible oil represented by ester oil is used as the refrigeration oil. A reciprocating, rotary, screw type compressor can be used as the compressor. The electric motor 21 incorporated in the compressor 23 is shielded from the outside air and there is no fear of oxidation, but since it is filled with a refrigerant, it is necessary to have a refrigerant resistance specification.

In the compressor constructed as described above, the driving electric motor 21 improves power performance and controllability, and realizes high efficiency and low noise. In the inverter driven compressor, the optimum values of the input and the efficiency fluctuate for each frequency. However, in the compressor 23 of the present embodiment, the efficiency is improved over a wide compressor frequency range driven by the inverter. It is possible to improve efficiency. Further, since the vibration and noise can be reduced and the frequency range can be widened, the utility value of the compressor 23 can be enhanced. further,
When a refrigerant having a higher pressure than that of the conventional R22 such as R410a is used, it is possible to shorten the time in which the refrigerant is in a high pressure state at the time of starting the refrigeration cycle, so that the reliability of the refrigeration cycle can be improved.

[0088]

As described above, according to the present invention, in the rotor of the permanent magnet type rotary electric machine, the permanent magnets are plated-less, so that the reduction of the magnetic flux amount of the permanent magnets is suppressed, the cost is low and the efficiency is high. A permanent magnet type rotating electric machine can be realized. Also,
When used as an electric motor, heat generation can be suppressed,
It is possible to realize a highly reliable electric motor that prevents demagnetization of the permanent magnet. Furthermore, since it is not plated, it has good recyclability.

Further, a cylindrical rotor core having a rotary shaft passing through the center thereof, a permanent magnet embedding hole formed in the rotor core so that an end portion in the axial direction is an opening, and the permanent magnet embedding Since the platingless permanent magnet inserted into the hole and the end plate that closes the opening and keeps the permanent magnet embedding hole airtight, the performance after assembly without surface treatment of the permanent magnet is provided. Deterioration can be prevented.

Further, the steps of unsealing the container sealed in the antioxidant state and taking out the platingless permanent magnet, the step of inserting the platingless permanent magnet into the permanent magnet embedding hole formed in the rotor core, and Steps for closing the permanent magnet embedding hole in an airtight state are performed.Each step is performed in a temperature and humidity environment that prevents or slows down the oxidation of the platingless permanent magnet, so that the permanent magnet can be assembled without surface treatment. It is possible to prevent later performance deterioration.

In addition, the step of opening the container sealed in the antioxidant state and taking out the platingless permanent magnet, the step of inserting the platingless permanent magnet into the permanent magnet embedding hole formed in the rotor core, and The step of shutting off the platingless permanent magnet from the outside air is performed, and since each of these steps is performed in a temperature and humidity environment that prevents or slows down the oxidation of the platingless permanent magnet, the outside air after assembling is not required even if the permanent magnet is not surface-treated. The performance deterioration due to can be prevented.

Further, in a rotor of a permanent magnet type rotary electric machine in which permanent magnets are divided and embedded in the rotor core or the permanent magnets are arranged near the surface of the rotor core, the divided permanent magnets or the end portions of the permanent magnets are separated from each other. Since it is insulated from the plate, the eddy current of the permanent magnet is suppressed, and it is possible to easily realize a highly efficient rotary electric machine at low cost. When used as an electric motor, heat generation can be suppressed, and a highly reliable permanent magnet type electric motor that prevents demagnetization of the permanent magnet can be realized.

In a rotor of a permanent magnet type rotary electric machine in which the permanent magnet is divided and embedded in the rotor core or the permanent magnet is arranged near the surface of the rotor core, the permanent magnet and the rotor core are insulated. , Suppress the eddy current of the permanent magnet,
A highly efficient rotary electric machine can be realized at low cost. When used as an electric motor, heat generation can be suppressed, and a highly reliable permanent magnet type electric motor that prevents demagnetization of the permanent magnet can be realized.

Further, since the arc-shaped permanent magnets are arranged near the rotor core surface and the permanent magnets are magnetized in the radial direction, high efficiency, low noise, low vibration and controllability can be achieved without increasing the cost. A good permanent magnet type rotary electric machine can be realized.

Further, the permanent magnet embedding hole which is continuously or intermittently bent and formed along the rotation direction of the rotor and the pole arrangement is the same in the centrifugal direction with the bent portion of the permanent magnet embedding hole sandwiched. Since it is equipped with multiple permanent magnets on a flat plate that are embedded in a pseudo-radial orientation, low cost and high efficiency,
It is possible to realize a permanent magnet type rotary electric machine that has low noise and vibration and good controllability.

Since the permanent magnet embedding hole which is intermittently formed along the rotation direction of the rotor and the permanent magnet which is embedded in the permanent magnet embedding hole leaving the flux barrier hole, are provided. It is possible to provide a permanent magnet type rotary electric machine having a low cost, high efficiency, and a wide operating range. Further, the permanent magnet is not inserted in a portion where demagnetization is likely to occur, so that demagnetization can be avoided.

Further, since the flux barrier hole is provided with a permanent magnet positioning member made of a non-magnetic and non-conductive material, it is possible to provide a low-cost, high-efficiency, permanent magnet type rotary electric machine having a wide operating range. Furthermore, since the circumferential dimension of the permanent magnet can be changed, demagnetization can be avoided, and a highly efficient permanent magnet type rotary electric machine compatible with various models can be realized.

Further, since a plurality of permanent magnets separated from each other by the repulsive force of the magnets are provided in the permanent magnet embedding holes, it is possible to provide a low cost, high efficiency, and permanent magnet type rotary electric machine having a wide operating range. Further, since the circumferential dimension of the permanent magnet can be easily changed, demagnetization can be avoided, and a highly efficient permanent magnet type rotary electric machine corresponding to various models can be realized. It also has good recyclability.

Further, since the bridge is formed between the flux barrier hole and the permanent magnet, it is possible to realize a highly reliable, highly efficient, low noise, low vibration permanent magnet type rotating electric machine that can be driven at high cost and at low cost.

Further, since the end of the permanent magnet embedding hole is rounded to form the flux barrier hole, the core strength is increased and the flow of the magnetic flux is smoothed, so that the permanent magnet of low cost, high efficiency and high reliability can be obtained. A magnet type rotating electric machine can be realized.

Further, since the poles are arranged in the same direction in the centrifugal direction and a bridge is formed between the permanent magnets adjacent to each other in the circumferential direction, it is possible to drive up to a high rotation speed and have high reliability, low noise and low vibration. An efficient permanent magnet type rotary electric machine can be realized.

In a rotor of a 6-pole DC brushless motor using a rare earth magnet as the permanent magnet, the position where the permanent magnet is embedded is expressed by α = distance from rotor outer diameter to permanent magnet / (rotor outer diameter) ² × When it is set to 100, since the configuration is such that α ≦ 0.6, it is possible to realize a rotary electric machine that is highly efficient, low cost, and excellent in cost performance.

Further, the thin portion or the flux barrier hole for suppressing the short circuit of the magnetic flux due to the permanent magnet is formed, and the distance between the permanent magnets of different poles through which the q-axis magnetic flux passes is set to be equal to or more than the thickness of the permanent magnet. It is possible to realize a highly efficient rotary electric machine with low noise and low vibration while increasing torque and ensuring rotor strength.

Further, in the stator of the permanent magnet type rotary electric machine, since the coil is constituted by the divided rods such as copper rods,
It is possible to simplify the manufacturing process, automate it, improve productivity, and reduce costs. Moreover, a highly efficient rotating electric machine can be realized.

Further, in the stator of the electric motor, the electric motor is divided into a plurality of parts in the rotational axis direction of the rotor, and each is independently selected and controlled by the control circuit, so that the electric motor with high efficiency and wide operating range can be realized. Further, since the skew can be configured, it is possible to realize an electric motor with low noise and low vibration.

Further, since the rotor according to any one of the above and the stator according to any one of the above is provided as the electric motor, it is possible to realize an electric motor that is low in cost, high in efficiency, good in controllability, and capable of reducing noise.

Further, since the electric motor is a compressor driving electric motor, it is possible to realize a compressor having a wide operating range, high efficiency, good controllability, and noise reduction. In addition, the device is simple and the cost can be reduced.

Further, in the refrigeration cycle apparatus including the compressor, the condenser, the expansion device, and the evaporator, which are connected by the refrigerant pipe, the above-mentioned compressor is provided, so that the refrigeration cycle with high efficiency and low noise can be realized. .

[Brief description of drawings]

FIG. 1 (a) of a rotor according to Embodiment 1 of the present invention
It is a plane sectional view and (b) side sectional view.

FIG. 2 (a) of a rotor according to Embodiment 2 of the present invention
It is a plane sectional view and (b) side sectional view.

FIG. 3 is an enlarged plan sectional view of a rotor according to a third embodiment of the present invention.

FIG. 4 is a correlation diagram showing a relationship between a permanent magnet temperature and an elapsed time, and a relationship between a magnetic flux amount and an elapsed time in a plating specification and a platingless specification.

FIG. 5 is a correlation diagram showing a relationship between a motor efficiency and a rotation speed of a plating specification and a platingless specification.

FIG. 6 is an enlarged plan sectional view of a rotor according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged sectional plan view of a rotor according to a fifth embodiment of the present invention.

FIG. 8 is an enlarged plan sectional view of a rotor according to a sixth embodiment of the present invention.

FIG. 9 is an enlarged plan sectional view of a rotor according to a seventh embodiment of the present invention.

FIG. 10 is a plane enlarged sectional view of a rotor according to an eighth embodiment of the present invention.

FIG. 11 is an enlarged plan sectional view of a rotor according to a ninth embodiment of the present invention.

FIG. 12 is an enlarged plan sectional view of a rotor according to a tenth embodiment of the present invention.

FIG. 13 is an enlarged plan sectional view of a rotor according to an eleventh embodiment of the present invention.

FIG. 14 is an enlarged plan sectional view of a rotor for explaining a twelfth embodiment of the present invention.

FIG. 15 is a correlation diagram showing the relationship between the permanent magnet and the average torque under the conditions where the volume of the permanent magnet is constant, the number of turns of the coil, and the current value are constant.

FIG. 16 is an enlarged plan sectional view of a rotor according to a thirteenth embodiment of the present invention.

FIG. 17 is a side view of a stator according to a fourteenth embodiment of the present invention.

FIG. 18 is a side view of an electric motor according to a fifteenth embodiment of the present invention.

FIG. 19 is a conceptual diagram of a refrigeration cycle apparatus according to Embodiment 16 of the present invention.

FIG. 20 is (a) a plane sectional view and (b) a side sectional view of a conventional permanent magnet type electric motor.

FIG. 21 is a plan sectional view of a conventional permanent magnet type electric motor.

FIG. 22 is a plan sectional view of a conventional permanent magnet type electric motor.

FIG. 23 is an enlarged cross-sectional view of a conventional permanent magnet type motor rotor.

FIG. 24 is (a) a side sectional view and (b) a plane sectional view of a conventional permanent magnet type electric motor.

[Explanation of symbols]

1 rotating shaft, 2 permanent magnets, 3 rotor core, 4
Flux barrier hole, 5 end plate, 6 copper rod, 7
Stator core, 8 coils, 9 magnetization direction, 10
Insulation sheet, 11 bridge, 12 platingless rare earth magnet, 13 teeth, 14 rotor, 1
5 stators, 16 air gaps, 17 slots,
18 permanent magnet embedding hole, 19 permanent magnet positioning part, 20 permanent magnet positioning member, 21 permanent magnet type electric motor, 22 inverter main circuit, 23 compressor,
24 q-axis magnetic flux.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 15/03 H02K 15/03 Z 16/04 16/04 21/14 21/14 M (72) Inventor Yoshino Hayato 2-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. F term (reference) 3H003 AA02 AA05 AB04 AC03 AD01 CF04 3H029 AA03 AA04 AA12 AB03 BB11 BB21 BB31 BB32 BB41 BB41 CC07 CC27 5H621 AA02 GB10H01BB02 JK03 JK08 5H622 AA04 CA02 CA05 CA10 CA13 CB01 CB04 DD02 PP03 PP16 PP18 QA08 QB03

Claims (21)

[Claims] 1. A rotor of a permanent magnet type rotary electric machine,
A rotor for a rotary electric machine, which is characterized in that a permanent magnet is plated-less. 2. A cylindrical rotor core having a rotating shaft passing through the center thereof, a permanent magnet embedding hole formed in the rotor core so that an end portion in the axial direction is an opening, and the permanent magnet embedding. The rotor of a rotary electric machine according to claim 1, further comprising: a platingless permanent magnet inserted into the hole; and an end plate that closes the opening and holds the permanent magnet embedding hole in an airtight state. 3. A step of unsealing a container sealed in an antioxidation state to take out a platingless permanent magnet; a step of inserting the platingless permanent magnet into a permanent magnet embedding hole formed in a rotor core; A step of closing the permanent magnet embedding hole in an airtight state, and performing each of these steps in a temperature and humidity environment that prevents or slows down oxidation of the platingless permanent magnet. 4. A step of removing a platingless permanent magnet by opening a container sealed in an antioxidant state, a step of inserting the platingless permanent magnet into a permanent magnet embedding hole formed in a rotor core, and And a step of shutting off the platingless permanent magnet from the outside air, and performing each of these steps in a temperature and humidity environment that prevents or slows down the oxidation of the platingless permanent magnet. 5. In a rotor of a permanent magnet type rotary electric machine in which a permanent magnet is divided and embedded in a rotor core or the permanent magnet is arranged near the surface of the rotor core, the divided permanent magnets are separated from each other or the permanent magnet and the end. A rotor of a rotating electric machine, characterized by being insulated from a plate. 6. In a rotor of a permanent magnet type rotary electric machine, wherein a permanent magnet is divided and embedded in the rotor core or the permanent magnet is arranged near the surface of the rotor core, the permanent magnet is insulated from the rotor core. A rotor of a rotating electric machine characterized by. 7. A rotor for a rotating electric machine, wherein arc-shaped permanent magnets are arranged near the surface of a rotor core and the permanent magnets are magnetized in a radial direction. 8. A rotor of a permanent magnet type rotating electric machine,
A plurality of permanent magnet embedding holes formed by continuously or intermittently bending along the rotation direction of the rotor and a plurality of permanent magnet embedding holes having the same pole arrangement in the centrifugal direction sandwiching the bent portion of the permanent magnet embedding holes are embedded. A rotor for a rotating electric machine, comprising: a flat permanent magnet on a pseudo radial orientation. 9. A rotor of a permanent magnet type rotary electric machine,
A rotating electric machine comprising: a permanent magnet embedding hole which is intermittently formed along a rotation direction of a rotor; and a permanent magnet which is embedded in the permanent magnet embedding hole with a flux barrier hole left. Rotor. 10. The rotor of a rotating electric machine according to claim 9, wherein the flux barrier hole is provided with a permanent magnet positioning member made of a non-magnetic and non-conductive material. 11. The rotor of a rotating electric machine according to claim 9, wherein a plurality of permanent magnets are provided inside the permanent magnet embedding hole and are separated from each other by the repulsive force of the magnets. 12. The rotor of a rotating electric machine according to claim 9, wherein a bridge is formed between the flux barrier hole and the permanent magnet. 13. A flux barrier hole is formed by rounding an edge of an end portion of a permanent magnet embedding hole.
The rotor of the rotating electric machine described. 14. The rotor of a permanent magnet type rotating electric machine according to claim 1, wherein the poles are arranged in the same direction in the centrifugal direction, and a bridge is formed between circumferentially adjacent permanent magnets. 15. A rare earth magnet is used as the permanent magnet, and in a rotor of a 6-pole DC brushless motor, a position where the permanent magnet is embedded is defined as α = distance from rotor outer diameter to permanent magnet / (rotor outer diameter) ² × A rotor of a rotating electric machine, characterized in that it is arranged at a position where α ≦ 0.6 when 100 is set. 16. In a rotor of a permanent magnet type rotating electric machine, a thin portion or a flux barrier hole that suppresses a short circuit of magnetic flux due to a permanent magnet is formed, and a distance between permanent magnets of different poles through which a q-axis magnetic flux passes is permanent. A rotor for a rotating electric machine, characterized by having a thickness greater than that of a magnet. 17. The stator of a permanent magnet type rotating electric machine according to claim 1, wherein the coil is composed of divided rods such as copper rods. 18. A stator of an electric motor, wherein the stator of an electric motor is divided into a plurality of parts in a direction of a rotation axis of the rotor, and each is independently selected and controlled by a control circuit. 19. An electric motor comprising the rotor according to any one of claims 1 to 16 and the stator according to any one of claims 17 to 18. 20. A compressor comprising the electric motor according to claim 19 as a driving electric motor. 21. A refrigeration cycle apparatus comprising a compressor, a condenser, a throttle device, and an evaporator, and a refrigeration cycle device in which these are connected by a refrigerant pipe, comprising the compressor according to claim 20.