JP2002300762A - Induction synchronous motor and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a induction synchronous motor in which permanent magnets can be inserted into its rotor without attracting the permanent magnets each other and which improves workability for assembling of the rotor. SOLUTION: The induction synchronous motor is constituted of a stator 4 having a stator winding 7 and a rotor 5 rotating inside the stator 4. The rotor 5 has a secondary conductor 5B disposed on the peripheral part of its rotor yoke 5A and the permanent magnets 31 embedded in the rotor yoke 5A. The permanent magnets 31 are magnetized with the current energized in the stator winding 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction synchronous motor including a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke. .

[0002]

2. Description of the Related Art Conventionally, as an electric motor for driving an air conditioner (air conditioner) or a hermetic electric compressor constituting a refrigerating cycle of a refrigerator (electric refrigerator), an induction synchronous motor driven by a commercial power supply has been used. And DC brushless electric motors were used. These motors are fixed in a closed container, and the motor is composed of a stator having a stator winding and a rotor rotating in the stator. In the induction synchronous motor, the rotor is induction-rotated by supplying a single-phase or three-phase AC commercial power supply to the stator winding.

[0003]

However, in general, the permanent magnet used in the induction synchronous motor is magnetized by inserting a permanent magnet previously magnetized in another place into the rotor before assembling into the rotor. It was a method. For this reason, when inserting the magnetized permanent magnet into the rotor, each permanent magnet is attracted and the workability is reduced. Further, when the rotor is inserted into the stator, there is a problem that the rotor is attracted to the surroundings and the workability of assembling the induction synchronous motor is deteriorated.

In addition, since a permanent magnet is incorporated in the rotor, there has been a problem that the workability of assembling the rotor to the stator is deteriorated, resulting in defective assembly.

The present invention has been made in order to solve the problems of the prior art, and allows the permanent magnets to be inserted into the rotor without the respective permanent magnets being attracted. An object of the present invention is to provide an improved induction synchronous motor and a method for manufacturing the same.

[0006]

That is, an induction synchronous motor according to the present invention comprises a stator having a stator winding, and a rotor rotating in the stator. A secondary conductor provided in a peripheral portion of the child yoke portion; and a permanent magnet embedded in the rotor yoke portion, wherein the permanent magnet is magnetized by a current supplied to the stator winding. Is what is being done.

Further, in the induction synchronous motor according to the second aspect of the present invention, in addition to the above, the permanent magnet is a rare earth magnet or a ferrite magnet.

According to a third aspect of the present invention, in addition to the first or second aspect, the stator winding has a single-phase configuration having a main winding and an auxiliary winding. The permanent magnet is magnetized by a current supplied to one of the main winding and the auxiliary winding.

According to a fourth aspect of the present invention, in the induction synchronous motor according to the first or second aspect, the stator winding has a three-phase configuration having a three-phase winding, and the permanent magnet includes: The stator winding is magnetized by a current applied to one phase, two phase, or three phase winding.

According to a fifth aspect of the present invention, in addition to the first, second, third, or fourth aspect of the present invention, the stator winding is formed of a varnish or a heated winding. A fixing material for fusing the wire is applied.

According to a sixth aspect of the present invention, in addition to the first, second, third, fourth, or fifth aspect, the induction synchronous motor is mounted on a compressor.

According to a seventh aspect of the present invention, in the induction synchronous motor according to the sixth aspect, the compressor is used for an air conditioner or an electric refrigerator.

Further, a method of manufacturing an induction synchronous motor according to the invention of claim 8 comprises a stator having a stator winding and a rotor rotating in the rotor. There is a secondary conductor provided in the periphery of the child yoke, and a magnet material embedded in the rotor yoke, and the magnet material of the permanent magnet is provided in the rotor yoke. By embedding and applying a current to the stator winding,
The magnet material is magnetized.

Further, in the method of manufacturing an induction synchronous motor according to the ninth aspect of the present invention, in addition to the eighth aspect, a rare earth or ferrite material is used as the magnet material.

According to a tenth aspect of the present invention, in addition to the eighth or ninth aspect, the stator winding has a single-phase configuration having a main winding and an auxiliary winding. The magnet material is magnetized by applying a current to one of the main winding and the auxiliary winding.

According to a still further aspect of the present invention, in the method for manufacturing an induction synchronous motor of the present invention, the stator winding has a three-phase structure having a three-phase winding. The magnet material is magnetized by applying a current to one phase, two phase, or three phase winding of the child winding.

According to a twelfth aspect of the present invention, in addition to the eighth, ninth, tenth, or eleventh aspect of the present invention, the stator winding has a varnish or a heating element. Then, a fixing material for fusing the winding is applied.

According to the present invention, the induction synchronous motor comprises a stator having a stator winding and a rotor rotating in the stator, the rotor yoke constituting the rotor. Since it has a secondary conductor provided in a peripheral portion and a permanent magnet embedded in the rotor yoke, and the permanent magnet is magnetized by a current supplied to the stator winding, For example, since the rotor in which the magnet material of the non-magnetized permanent magnet is inserted is incorporated in the stator, when the rotor is inserted into the stator, the rotor is inserted without being attracted to the surroundings. It becomes possible. Therefore, it is possible to prevent the disadvantage that the productivity of the induction synchronous motor is reduced, so that it is possible to improve the workability of assembling the induction synchronous motor, and to provide a highly reliable induction synchronous motor as a whole. Is what you can do.

According to the second aspect of the present invention, in addition to the above, since the permanent magnet is a rare earth magnet or a ferrite magnet in addition to the above, high magnet characteristics can be realized. As a result, it is possible to reduce the current flowing through the stator winding and to reduce the temperature generated during magnetization. Therefore, the deformation of the rotor or the stator can be minimized by the high temperature, and high quality as an induction synchronous motor can be reliably ensured.

In particular, in an induction synchronous motor, a current flows through the secondary conductor even during the normal synchronous operation, and the temperature of the entire rotor increases. For example, a ferrite magnet or a rare earth magnet (having a coercive force of 1350 at room temperature) is used. ２2150 kA / m and the coercive force temperature coefficient is -0.7% / ° C. or less)
This makes it possible to prevent demagnetization at high temperatures.

According to a third aspect of the present invention, in addition to the first or second aspect, the stator winding has a single-phase configuration having a main winding and an auxiliary winding, and the permanent magnet includes: Since the magnetizing is performed by the current applied to one of the main winding and the auxiliary winding, it is possible to improve the magnetizing performance as compared with, for example, simultaneous energization of the main winding and the auxiliary winding. Becomes
Therefore, it is possible to perform strong magnetization on the unmagnetized magnet material.

According to a fourth aspect of the present invention, in the induction synchronous motor according to the first or second aspect, the stator winding has a three-phase configuration having a three-phase winding, and the permanent magnet is Since the stator winding is magnetized by a current flowing through one phase, two phase, or three phase winding of the stator winding, the winding is determined by the magnet arrangement and the allowable current of the winding (such as deformation). This makes it possible to select the current-carrying phase of the wire.

According to a fifth aspect of the present invention, in addition to the first, second, third, or fourth aspect of the present invention, the induction synchronous motor further comprises a varnish or a heated stator winding. Since the fixing material for fusing the winding is applied, for example,
When the non-magnetized magnet material inserted in the rotor is energized and magnetized by passing through the stator winding, even if the stator winding generates heat and is heated, deformation of the winding end of the stator winding due to heating Further, it is possible to prevent deterioration of the winding film. Therefore,
Even if the magnet material which is not magnetized inserted in the rotor is magnetized, the winding end of the stator winding is not deformed, so that a highly reliable induction synchronous motor can be supplied. It is.

According to the sixth aspect of the present invention, the induction synchronous motor is mounted on the compressor in addition to the first, second, third, fourth or fifth aspect. The reliability can be greatly improved.

According to the seventh aspect of the present invention, in addition to the sixth aspect, the induction synchronous motor is used in an air conditioner or an electric refrigerator, and the compressor is used in an air conditioner or an electric refrigerator. The reliability can be greatly improved.

According to an eighth aspect of the present invention, a method of manufacturing an induction synchronous motor includes a stator having a stator winding and a rotor rotating in the rotor, and constitutes the rotor. A rotor provided with a secondary conductor provided in the periphery of the rotor yoke and a magnet material embedded in the rotor yoke, wherein the magnet material of the permanent magnet is provided in the rotor yoke; And by passing a current through the stator winding,
Since the magnet material is magnetized, when the rotor is inserted into the stator, it does not stick to the surroundings, so that the workability of assembling the induction synchronous motor can be greatly improved. Therefore, it is possible to prevent the disadvantage that the productivity of the induction synchronous motor is reduced, so that it is possible to improve the workability of assembling the induction synchronous motor, and to provide a highly reliable induction synchronous motor as a whole. Is what you can do.

According to the ninth aspect of the present invention, in addition to the eighth aspect, the method of manufacturing an induction synchronous motor uses a rare earth or ferrite material as the magnet material. Characteristics can be realized. As a result, it is possible to reduce the current flowing through the stator winding and to reduce the temperature generated during magnetization.
Therefore, the deformation of the rotor or the stator can be minimized by the high temperature, and high quality as an induction synchronous motor can be reliably ensured.

According to a tenth aspect of the present invention, in addition to the eighth or ninth aspect, the method of manufacturing an induction synchronous motor further comprises a single-phase configuration in which the stator winding has a main winding and an auxiliary winding. By applying a current to one of the main winding and the auxiliary winding to magnetize the magnet material,
For example, it is possible to improve the magnetizing performance as compared with when the main winding and the auxiliary winding are energized simultaneously. Therefore, it is possible to perform strong magnetization on the unmagnetized magnet material.

According to an eleventh aspect of the present invention, in addition to the eighth or ninth aspect, the method of manufacturing an induction synchronous motor further comprises a three-phase configuration in which the stator winding has a three-phase winding. The magnet material is magnetized by passing a current through a single-phase, two-phase, or three-phase winding of the stator winding. ) Allows the current-carrying phase of the winding to be selected.

According to a twelfth aspect of the present invention, in addition to the eighth, ninth, tenth or eleventh aspect of the present invention, the method of manufacturing an induction synchronous motor further comprises a varnish or a varnish on the stator winding. Since a fixing material that is heated to fuse the windings is applied, for example, when a non-magnetized magnet material inserted into the rotor is energized and magnetized, the stator windings Even when a force is applied, it is possible to prevent the deformation of the winding and the deterioration of the winding film. Therefore, even if the non-magnetized magnet material inserted into the rotor is magnetized, the winding end of the stator winding is not deformed, so that a highly reliable induction synchronous motor can be supplied. It becomes.

[0031]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a vertical sectional side view of a hermetic electric compressor C to which an induction synchronous motor 2 according to the present invention is applied. In FIG. 1, reference numeral 1 denotes a closed container, in which an induction synchronous motor 2 is accommodated on the upper side, and a compressor 3 which is rotationally driven by the induction synchronous motor 2 is accommodated on a lower side. After storing the induction synchronous motor 2 and the compressor 3 in the closed container 1 previously divided into two,
It is sealed by high frequency welding. Incidentally, examples of the hermetic electric compressor C include a rotary, reciprocating, scroll compressor and the like.

The induction synchronous motor 2 is constituted by a single-phase two-pole, and is fixed to the inner wall of the closed casing 1, and is supported inside the stator 4 so as to be rotatable around a rotating shaft 6. And a rotator 5 formed. The stator 4 includes a stator winding 7 that applies a rotating magnetic field to the rotor 5.

The compressor 3 is provided with the first partition
And a second rotary cylinder 10. Eccentric portions 11 and 12 that are driven to rotate by the rotating shaft 6 are attached to the cylinders 9 and 10, respectively.
80 degrees out of phase.

Reference numerals 13 and 14 denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate in the cylinder by rotation of the eccentric portions 11 and 12, respectively. 1
Reference numerals 5 and 16 denote a first frame and a second frame, respectively. The first frame 15 forms a closed compression space of the cylinder 9 between the first frame 15 and the intermediate partition plate 8. Similarly, a closed compression space of the cylinder 10 is formed between the cylinder 16 and the intermediate partition plate 8. In addition, the first frame 15 and the second frame 16 each support the lower part of the rotary shaft 6 so as to be rotatable.
7 and 18 are provided.

Reference numerals 19 and 20 denote discharge mufflers, which are attached so as to cover the first frame 15 and the second frame 16, respectively. The cylinder 9 and the discharge muffler 19 communicate with each other via a discharge hole (not shown) provided in the first frame 15, and the cylinder 10 and the discharge muffler 20 also communicate with a discharge not shown (not shown) provided in the second frame 16. It is connected by a hole. Reference numeral 21 denotes a bypass pipe provided outside the sealed container 1 and communicates with the inside of the discharge muffler 20.

Reference numeral 22 denotes a discharge pipe provided on the closed vessel 1, and reference numerals 23 and 24 denote cylinders 9, 10 respectively.
It is a suction pipe that leads to Reference numeral 25 denotes a sealed terminal, which is provided from outside the sealed container 1 to the stator winding 7 of the stator 4.
(Lead wires connecting the sealed terminal 25 and the stator winding 7 are not shown). Reference numeral 60 denotes a balancer for improving the rotational balance of the rotor 5.

Numeral 26 denotes a rotor iron core, which is not shown but is formed by laminating a plurality of iron plates for a rotor obtained by punching out an electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm into a predetermined shape, and caulking them together to form an integral unit. (In addition, it may be integrated by welding without depending on caulking). 66, 67 are end face members attached to the upper and lower ends of the rotor core 26, respectively. The end face members 66 and 67 are made of a flat plate made of a non-magnetic material such as stainless steel, aluminum, copper, and brass.
When a magnetic material is used for the end face members 66 and 67, the end face members 66 and 67 serve as a magnetic path, causing a magnet of the rotor 5 to cause a magnetic short circuit and deteriorating the operation performance of the induction synchronous motor 2.

FIG. 2 is a plan view of the hermetic electric compressor C in which the hermetic container 1 is divided into two parts, FIG. 3 is a cross-sectional top view of the hermetic electric compressor C, FIG. FIG. 6 is a side view of the rotor 5. A stator winding 7 is wound around the stator 4, and a lead wire 50 connected to the stator winding 7 is provided.
And the coil end of the stator winding 7 are connected together by a polyester thread 70, and the lead wire 50 is connected to the closed terminal 25.

The rotor 5 includes a rotor yoke portion 5A, a cage-shaped secondary conductor 5B that is positioned around the rotor yoke portion 5A and is die-cast, and a rotor yoke portion 5A. The other end ring 69, which is located at the periphery of both end faces and protrudes in a ring shape by a predetermined dimension, is die-cast integrally with the cage-shaped secondary conductor 5B, and is embedded in the rotor yoke 5A, as will be described later. And a permanent magnet 31. The permanent magnet 31 is magnetized after a permanent magnet material is inserted into a slot 44 described later. Magnetization is performed by a permanent magnet 31 (3) embedded on one side (for example, the right side in the drawing) of the rotating shaft 6.
1SA, 31SB) are the same S pole, and the permanent magnets 31 (31NA, 31SB) embedded on the other side (left side in the figure)
NB) are respectively magnetized to the same N pole (FIGS. 4 and 5).

A plurality of cage-shaped secondary conductors 5B are provided around the rotor yoke portion 5A, and are formed in a cage shape (not shown) in a cage shape along the extending direction of the rotating shaft 6. Aluminum die casting is injection molded. The basket-shaped secondary conductor 5B is formed in a so-called skewed structure that is spirally inclined at a predetermined angle in the circumferential direction of the rotating shaft 6 from one end to the other end (FIG. 6).

A plurality of slots 44 (four in the present embodiment) are formed in the rotor yoke portion 5A so as to penetrate in the vertical direction and open at both ends. Each is closed at 67 (FIG. 8). Then, the cage-shaped secondary conductor 5B and the end ring 6
8, 69 at the time of die casting molding, one end face member 67,
One end ring 69 is fixed to the rotor yoke 5A. Further, the other end member 66 is fixed to the rotor yoke 5A with a plurality of rivets 66A.

In this case, after the magnet material of the unmagnetized permanent magnet 31 is inserted from the opening of the slot 44, the opening is closed by the other end member 66, and this end member 66 is connected to the rivets 66A. Thus, the magnet material is fixed in each of the slots 44 by caulking and fixing to an engaging hole 5C provided in the rotor yoke portion 5A. As the magnet material, for example, a praseodymium-based or neodymium-based rare-earth or ferrite material whose surface is nickel-plated or the like, which can realize high magnet properties even with a low magnetizing magnetic field, is used. In this case, a ferrite magnet or a rare earth magnet (having a coercive force at room temperature of 1350 to 2150 kA)
/ M, the temperature coefficient of the coercive force is −0.7% / ° C. or less), whereby demagnetization during operation can be prevented.

Here, when a magnet material that is not magnetized is inserted into the rotor and then the stator winding is energized to perform magnetization, the stator winding is deformed by the electromagnetic force generated during magnetization. Resulting in. For this reason, a varnish or a fixing material that is fused by heating is applied to the stator winding 7. The varnish or the fixing material fused by heating is used to deform and wind the winding end of the stator winding 7 due to heating even when the stator winding 7 is heated and heated when magnetizing the magnet material. It is intended to surely prevent the deterioration of the wire coating.

Then, there is a problem that the quality of the induction synchronous motor is reduced. Therefore, one phase of the stator winding, or
A predetermined voltage and a predetermined current are applied to the two-phase winding to magnetize an unmagnetized magnet material provided in the rotor yoke portion 5A and fixed in the slot 44. This makes it possible to improve the magnetizing performance as compared to when the main winding 7A and the auxiliary winding 7B described later are energized simultaneously. Therefore, strong magnetization can be performed on the magnet material that has not been magnetized.

The rotor 5 is provided with four permanent magnets 31, 31 magnetized with a magnet material, facing the rotating shaft 6, and the facing permanent magnets 31, 31 are arranged with different magnetic poles. (FIG. 7). Then, the permanent magnet 3 embedded in one side of the rotating shaft 6 (for example, the upper and lower right sides in the figure)
1SA and 31SB have the same S pole, respectively, and the permanent magnets 31NA and 31NB embedded on the other side (upper and lower left in the figure) have the same N pole.

That is, the permanent magnets 31SA and 31SB, and the permanent magnets 31NA and 31NB are arranged in a substantially rectangular shape around the rotating shaft 6, and have different S poles toward the outside of the rotating shaft 6 in the circumferential direction. Embedded in a two pole configuration,
It is configured such that a rotating force can be applied to the rotor 5 by the magnetic force of a main winding 7A and an auxiliary winding 7B described later. The arrangement of the permanent magnet 31 in FIG. 7 is different from the arrangement of the permanent magnet 31 in FIGS. 2, 3, 4, and 5 described above.
The arrangement of the permanent magnets 31 in FIG. 7 may be changed as shown in FIGS. 2, 3, 4, and 5. In this case, it is necessary to change the swaging position of the rivet 66A. Also, FIG.
The permanent magnets 31 shown in FIGS. 3, 4, and 5 may be arranged as shown in FIG.

An air conditioner using such a hermetic electric compressor C equipped with the induction synchronous motor 2 or a refrigerant circuit such as an electric refrigerator (FIG. 9) is used for indoor air conditioning and refrigerator storage. The inside is cooled. That is, when the compressor 3 of the hermetic electric compressor C is driven, the refrigerant sealed in the refrigerant circuit is sucked from the suction pipe 23 and transferred to the first rotary cylinder 9 and the second rotary cylinder 10. Then, it is compressed and discharged from the discharge pipe 22 to the pipe 27. The compressed gas refrigerant discharged to the pipe 27 is
(Condenser), in which heat is dissipated and condensed to become a liquid refrigerant and flow into a receiver (receiver tank) 29.

The liquid refrigerant, which flows into the receiver 29 and is temporarily stored therein, is throttled by a temperature automatic expansion valve 37 through a dryer 30, a moisture indicator 35 and an electromagnetic valve 36 from a pipe 29 A on the outlet side of the receiver 29. After that, it flows into an evaporator 38 (evaporator) where it is evaporated and vaporized. At that time, the refrigerant exerts a cooling action by absorbing heat from the surroundings and almost liquefies. After that, the refrigerant flows into the accumulator 39 from the pipe 38A on the outlet side of the evaporator 38, where the refrigerant is separated into gas and liquid and then checked. The refrigeration cycle sucked into the compressor 3 again through the valve 40 is repeated.

The liquid refrigerant flowing out of the liquid receiver 29 is supplied to a pipe 29A.
From the evaporator 38 via a capillary tube 41, a high / low pressure switch 42, and a capillary tube 43.
And an accumulator 39 are connected to a pipe 38A. The high / low pressure switch 42 detects the pressure between the pipes 29A and 38A via the capillary tubes 41 and 43, and the pressure between the pipes 29A and 38A becomes equal to or greater than a predetermined pressure difference, and is sucked into the hermetic electric compressor C. When the amount of the refrigerant to be supplied is insufficient, the liquid refrigerant from the liquid receiver 29 flows into the compressor 3 and is protected. The automatic temperature expansion valve 37 automatically adjusts the opening based on the temperature detected by the temperature-sensitive cylinder 34 provided on the outlet side of the evaporator 38.

FIG. 10 shows an electric circuit diagram of the induction synchronous motor 2. In FIG. 10, an induction synchronous motor 2 supplied with electric power from a single-phase AC commercial power supply AC2 has a main winding 7
A and an auxiliary winding 7B.
Main winding 7A connected to one of C2 is connected to the other of single-phase AC commercial power supply AC2. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC2 is
6. Single-phase AC commercial power supply AC via starting capacitor 48
2, and an operating capacitor 47 is connected in parallel with the PTC 46 and the starting capacitor 48.

The PTC 46 is a semiconductor element whose resistance value increases in proportion to the temperature. The resistance value is low when the induction synchronous motor 2 is started, and increases when current flows and heat is generated.
Reference numeral 49 denotes a power switch, which supplies power to the stator winding 7 from a current-sensitive line current detector for detecting a line current and a single-phase AC commercial power supply AC2, and also supplies power to the stator winding 7 It consists of an overload relay that also serves as a protection switch that shuts off the supply. The operating capacitor 47 is set to a capacity suitable for steady operation, and in a state where the operating capacitor 47 and the starting capacitor 48 are connected in parallel, the capacitors 47 and 48 are set to capacities suitable for starting.

Next, the operation of the induction synchronous motor 2 will be described. When the power switch 49 is closed, a current flows from the single-phase AC commercial power supply AC2 to the main winding 7A and the auxiliary winding 7B. When the induction synchronous motor 2 is started at the beginning, the temperature of the PTC 46 is low and the resistance value is low, so that a large current flows through the PTC 46 and a large current also flows through the auxiliary winding 7B, and the auxiliary winding 7B is connected in parallel. Starting torque is obtained from the current phase difference between the operating capacitor 47, the starting capacitor 48 and the main winding 7A, and the induction synchronous motor 2 starts the starting operation.

Then, the PTC 46 self-generates heat by this energization, so that the resistance value increases and eventually the PTC 4
Almost no current flows through 6 itself. As a result, the starting capacitor 48 is disconnected, and the induction synchronous motor 2 continues the steady operation by the current phase difference between the main winding 7A and the auxiliary winding 7B by the operation capacitor 47. By operating the hermetic electric compressor C, indoor air conditioning is performed by air conditioning, and the inside of the refrigerator is cooled.

As described above, after the magnet material of the permanent magnet 31 is embedded in the rotor yoke portion 5A, a current is applied to the stator winding 7 to magnetize the magnet material. Therefore, when the rotor 5 is inserted into the stator 4, the permanent magnet 31 inserted into the stator 4 does not stick to the surroundings, so that the workability of assembling the induction synchronous motor 2 can be greatly improved. It becomes possible. This allows
The inconvenience of reducing the productivity of the induction synchronous motor 2 can be prevented beforehand, and the workability of assembling the induction synchronous motor 2 can be improved.

Next, another rotor 5 is shown in FIG. In this case, two magnet materials are embedded in the rotor yoke portion 5A, and the two magnet materials are formed in a plate shape, and two magnet materials are provided in parallel with the rotor 5 as a center. At the same time, it is buried in a slot 44 formed to penetrate vertically in the rotor yoke portion 5A. The magnet material is made of a rare earth or ferrite material as described above.

FIG. 16 shows a three-phase two-pole induction synchronous motor 2A. The induction synchronous motor 2A is mounted on the hermetic electric compressor C as in the case of the induction synchronous motor 2. FIG. 16 is an electric circuit diagram of a three-phase two-pole induction synchronous motor 2A.
In the figure, the induction synchronous motor 2A has a winding 75A, a winding 7
5B, and a three-phase stator winding 75 including a winding 75C. Each winding 75A of the stator winding 75, the winding 75
B, the winding 75C is connected to a three-phase AC commercial power supply AC3 via a power switch 77. Reference numeral 76 denotes a current-sensitive line current detector for detecting a line current.
A, windings 75B, and wirings connected to the windings 75C, respectively. The power switch 77 also functions as a protection switch that shuts off power supply to the stator winding 7 when a predetermined current set by the line current detector 76 is detected. Other configurations are the same as those described above.

The two magnet materials are one phase of the stator winding,
Alternatively, a predetermined voltage and a predetermined current are applied to the two-phase or three-phase winding, and the unmagnetized magnet material provided in the rotor yoke portion 5A and fixed in the slot 44 is magnetized. .
Thereby, the two opposing magnet materials are magnetized by the permanent magnets 31 having different magnetic poles. That is, the right permanent magnet 31SA facing the rotor 5 and the left permanent magnet 31N
Each permanent magnet 31... In which A is magnetized to a different magnetic pole is incorporated.

On the other hand, another example of the rotor 5 is shown in FIG. Also in this case, two magnet materials are provided in the rotor yoke portion 5A, and the two magnet materials are respectively embedded in slots 44 formed vertically through the rotor yoke portion 5A. ing. The magnet material is arranged inside the cage-shaped secondary conductor 5B in an arc shape at a predetermined interval, and both ends of both arc-shaped magnet materials are embedded close to each other. The magnet material is made of a rare earth or ferrite material as described above.

The two magnet materials are one phase of the stator winding,
Alternatively, a predetermined voltage and a predetermined current are applied to the two-phase or three-phase winding, and the unmagnetized magnet material provided in the rotor yoke portion 5A and fixed in each slot 44 is magnetized. You. Thus, the opposing magnet materials constitute the rotor 5 magnetized by the permanent magnets 31 having different magnetic poles. That is, the upper and lower two permanent magnets 31SA and 31SB facing the rotor 5 and the upper and lower two permanent magnets 31
Each permanent magnet 31... In which NA and 31NB are magnetized to different magnetic poles is incorporated.

FIG. 13 shows another rotor 5. Also in this case, four magnet materials are provided in the rotor yoke portion 5A, and the four magnet materials are provided in the rotor yoke portion 5A.
Are respectively buried in slots 44 penetrating vertically. The magnet material is buried opposite the center of the rotor 5 in a state in which two permanent magnets 31 are arranged in a substantially rectangular shape inside the basket-shaped secondary conductor 5B, and is arranged in a substantially vertically elongated diamond shape on the upper surface. I have. The magnet material is made of a rare earth or ferrite material as described above. 32 is an S pole (permanent magnets 31SA and 31SB) and an N pole (permanent magnet 31N).
A, 31 NB) for blocking the magnetic field, but the gap 32 may be omitted.

Each magnetic material is one phase of the stator winding,
Alternatively, a predetermined voltage and a predetermined current are applied to the two-phase or three-phase winding, and the unmagnetized magnet material provided in the rotor yoke portion 5A and fixed in each slot 44 is magnetized. You. As a result, the nuclear magnetic materials disposed opposite to each other are magnetized by the permanent magnets 31 having different magnetic poles. That is,
The rotor 5 has two upper right and lower permanent magnets 31S opposed to each other.
A, 31SB and two upper and lower permanent magnets 31NA, 3
1NB and each permanent magnet 31 magnetized to a different magnetic pole.
・ Built-in

FIG. 14 shows another rotor 5. Also in this case, the rotor yoke portion 5A is provided with six magnet materials, and the six magnet materials are provided in the rotor yoke portion 5A.
Are respectively buried in slots 44 penetrating vertically. The magnet material is hexagonally arranged inside the cage-shaped secondary conductor 5B so as to face the rotor 5 as a center. The magnet material is made of a rare earth or ferrite material as described above.

Each magnetic material is one phase of the stator winding,
Alternatively, a predetermined voltage and a predetermined current are applied to the two-phase or three-phase winding, and the unmagnetized magnet material provided in the rotor yoke portion 5A and fixed in each slot 44 is magnetized. You. As a result, the nuclear magnetic materials disposed opposite to each other are magnetized by the permanent magnets 31 having different magnetic poles. That is,
The rotor 5 has three opposing permanent magnets 31SA, 3
1SB, 31SC, three permanent magnets 31NA on the left, 3
Each permanent magnet 31... In which 1NB and 31NC are magnetized to different magnetic poles is incorporated.

FIG. 15 shows another rotor 5. Also in this case, the rotor yoke portion 5A is provided with eight magnet materials, and the eight magnet materials are provided in the rotor yoke portion 5A.
Are respectively buried in slots 44 penetrating vertically. The magnet material is arranged octagonally inside the basket-shaped secondary conductor 5B so as to face the rotor 5 as a center. The magnet material is made of a rare earth or ferrite material as described above.

Then, each magnet material is one phase of the stator winding,
Alternatively, a predetermined voltage and a predetermined current are applied to the two-phase or three-phase winding, and the unmagnetized magnet material provided in the rotor yoke portion 5A and fixed in each slot 44 is magnetized. You. As a result, the nuclear magnetic materials disposed opposite to each other are magnetized by the permanent magnets 31 having different magnetic poles. That is,
The rotor 5 has three opposing permanent magnets 31SA, 3
1SB, 31SC, 31SD and three permanent magnets 3 on the left
1NA, 31NB, 31NC, 31ND, and permanent magnets 31... Are magnetized to different magnetic poles.

As described above, a plurality of non-magnetized magnet materials inserted into the rotor 5 can be magnetized once or divided into a plurality of times. In this way, if the windings are deformed due to heat during magnetization, it is possible to select one of the two-phase windings or two-phase windings and to energize and magnetize them.
In addition, even when the winding or the like is not deformed by the heat due to the magnetization, either one-phase winding or two-phase winding can be selected, energized, and magnetized at once. Thereby, the rotor 5
The magnetizing of a plurality of non-magnetized magnet materials inserted into the motor can be efficiently performed, and the productivity of the induction synchronous motor 2 can be greatly improved.

In this embodiment, a rotary compressor is employed as an example of the hermetic electric compressor C. However, the present invention is not limited to this, and the hermetic electric compressor used in the hermetic scroll compressor comprising a pair of meshes engaged with each other. The present invention is also effective for a C induction synchronous motor.

[0068]

As described in detail above, according to the present invention, an induction synchronous motor includes a stator having a stator winding and a rotor rotating in the stator, and the rotor is constituted. A secondary conductor provided in a peripheral portion of the rotor yoke portion, and a permanent magnet embedded in the rotor yoke portion, wherein the permanent magnet is driven by a current supplied to the stator winding. Since it is magnetized, for example, the rotor in which the magnet material of the non-magnetized permanent magnet is inserted is incorporated in the stator, so when the rotor is inserted into the stator, it is attracted to the surroundings. It becomes possible to insert without doing. Therefore,
Since the inconvenience of reducing the productivity of the induction synchronous motor can be prevented beforehand, the workability of assembling the induction synchronous motor can be improved, and as a whole, it is possible to provide a highly reliable induction synchronous motor. That is what you can do.

According to the second aspect of the present invention, in addition to the above, since the permanent magnet is a rare earth magnet or a ferrite magnet in addition to the above, high magnet characteristics can be realized. As a result, it is possible to reduce the current flowing through the stator winding and to reduce the temperature generated during magnetization. Therefore, the deformation of the rotor or the stator can be minimized by the high temperature, and high quality as an induction synchronous motor can be reliably ensured.

In particular, in the induction synchronous motor, a current flows through the secondary conductor even during the normal synchronous operation, and the temperature of the entire rotor increases. For example, a ferrite magnet or a rare earth magnet (having a coercive force of 1350 at room temperature) is used. ２2150 kA / m and the temperature coefficient of coercive force is -0.7% / ° C. or less)
This makes it possible to prevent demagnetization at high temperatures.

According to the third aspect of the present invention, the first aspect
Or, in addition to claim 2, the stator winding has a single-phase configuration having a main winding and an auxiliary winding, and the permanent magnet is energized to one of the main winding and the auxiliary winding. For example, the magnetizing performance can be improved as compared to when the main winding and the auxiliary winding are energized at the same time. Therefore, it is possible to perform strong magnetization on the unmagnetized magnet material.

According to a fourth aspect of the present invention, in addition to the first or second aspect, the induction synchronous motor has a three-phase configuration in which the stator winding has a three-phase winding. Since the magnet is magnetized by a current applied to one phase of the stator winding, or two-phase, or three-phase winding,
The current-carrying phase of the winding can be selected based on the magnet arrangement and the allowable current of the winding (such as deformation).

Further, according to the invention of claim 5, the induction synchronous motor is provided in claim 1, claim 2, claim 3 or claim 4.
In addition, since the stator winding is coated with a varnish or a fixing material that is heated to fuse the winding, for example, a non-magnetized magnet material inserted into the rotor may be When the winding is energized and magnetized, even if the stator winding generates heat and is heated, it is possible to prevent deformation of the winding end of the stator winding and deterioration of the winding film due to heating. Therefore, even if the non-magnetized magnet material inserted into the rotor is magnetized, the winding end of the stator winding is not deformed, so that a highly reliable induction synchronous motor can be supplied. It becomes.

According to the sixth aspect of the present invention, the induction synchronous motor is mounted on the compressor in addition to the first, second, third, fourth or fifth aspect of the present invention. This will significantly improve the reliability of the machine.

According to the seventh aspect of the present invention, in addition to the sixth aspect, the induction-synchronous motor is an air conditioner,
Alternatively, since it is used for an electric refrigerator, the reliability of the air conditioner or the electric refrigerator can be greatly improved.

According to an eighth aspect of the present invention, a method of manufacturing an induction synchronous motor includes a stator having a stator winding and a rotor rotating within the rotor. A secondary conductor provided in the periphery of the rotor yoke to constitute;
A magnet material embedded in the rotor yoke portion, wherein the permanent magnet material is embedded in the rotor yoke portion, and a current is applied to the stator winding, Since the magnet material is magnetized, when the rotor is inserted into the stator, it does not stick to the surroundings, so that the workability of assembling the induction synchronous motor can be greatly improved. Therefore, it is possible to prevent the disadvantage that the productivity of the induction synchronous motor is reduced, so that it is possible to improve the workability of assembling the induction synchronous motor, and to provide a highly reliable induction synchronous motor as a whole. Is what you can do.

According to the ninth aspect of the present invention, in addition to the eighth aspect, the method of manufacturing an induction synchronous motor uses a rare earth or ferrite material as the magnet material. High magnet characteristics can be realized. As a result, it is possible to reduce the current flowing through the stator winding and to reduce the temperature generated during magnetization. Therefore, the deformation of the rotor or the stator can be minimized by the high temperature, and high quality as an induction synchronous motor can be reliably ensured.

According to a tenth aspect of the present invention, in addition to the eighth or ninth aspect, the method of manufacturing an induction synchronous motor further comprises a single stator winding having a main winding and an auxiliary winding. Since the magnet material is magnetized by applying a current to one of the main winding and the auxiliary winding, for example, when the main winding and the auxiliary winding are simultaneously energized, This also makes it possible to improve the magnetizing performance. Therefore, it is possible to perform strong magnetization on the unmagnetized magnet material.

According to the eleventh aspect of the present invention, in addition to the eighth or ninth aspect, the method of manufacturing an induction synchronous motor has a three-phase configuration in which the stator winding has a three-phase winding. The magnet material is magnetized by applying a current to one phase, two phase, or three phase winding of the stator winding, so that the magnet arrangement and the allowable current of the winding ( In this case, the current-carrying phase of the winding can be selected by pair deformation.

According to a twelfth aspect of the present invention, a method of manufacturing an induction synchronous motor is described in claim 8, claim 9, or claim 1.
In addition to the above-mentioned structure, the stator winding is coated with a varnish or a fixing material which is heated to fuse the winding, so that, for example, a non-magnetized magnet material inserted into a rotor When the stator winding is magnetized by supplying a current to the stator winding, deformation of the winding and deterioration of the winding film can be prevented even if the stator winding receives an electromagnetic force. Therefore, even if the non-magnetized magnet material inserted into the rotor is magnetized, the winding end of the stator winding is not deformed, so that a highly reliable induction synchronous motor can be supplied. It becomes.

[Brief description of the drawings]

FIG. 1 is an example of a vertical sectional side view of a hermetic electric compressor to which an induction synchronous motor of the present invention is applied.

FIG. 2 is a plan view of a hermetic electric compressor in which a hermetic container is divided into two parts.

FIG. 3 is a cross-sectional top view of the electric motor.

FIG. 4 is a partially cutaway top view of the rotor.

FIG. 5 is a partial longitudinal side view of a rotor.

FIG. 6 is a side view of the rotor.

FIG. 7 is a cross-sectional top view of the rotor of FIG. 6;

FIG. 8 is an explanatory diagram of an internal structure of a rotor.

FIG. 9 is a refrigerant circuit diagram of an air conditioner or an electric refrigerator using a hermetic electric compressor equipped with the induction synchronous motor of the present invention.

FIG. 10 is an electric circuit diagram of a single-phase two-pole induction synchronous motor.

FIG. 11 is a cross-sectional top view of another rotor.

FIG. 12 is a cross-sectional top view of another rotor.

FIG. 13 is a cross-sectional top view of another rotor.

FIG. 14 is a cross-sectional top view of another rotor.

FIG. 15 is a cross-sectional top view of another rotor.

FIG. 16 is an electric circuit diagram of a three-phase two-pole induction synchronous motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Induction synchronous motor 3 Compressor 4 Stator 5 Rotor 5A Rotor yoke part 5B Secondary conductor 5C Engagement hole 7 Stator winding 7A Main winding 7B Auxiliary winding 26 Rotor core 28 Condenser 29 receiver 31 permanent magnet 38 evaporator 49 power switch C hermetic electric compressor AC2 single-phase AC commercial power supply

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H02K 3/34 H02K 15/03 G 5H622 15/03 F04B 49/02 331B (72) Inventor Masaaki Takezawa Keihan, Moriguchi-shi, Osaka 2-5-5 Hondori Sanyo Electric Co., Ltd. (72) Inventor Kazuhiko Arai 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Eiichi Murata Moriguchi, Osaka 2-5-5, Keihan-Hondori-shi, Sanyo Electric Co., Ltd. (72) Inventor Noboru Onodera 2-5-5-Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Shigemi Koiso, inventor 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuhiro Enomoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yoshitomo Nakayama 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term (reference) in Sanyo Electric Co., Ltd. 3H029 AA04 AA09 AA13 AB 03 BB31 BB32. DD02 PP03 PP10 PP12 QB01 QB10

Claims (12)

[Claims] 1. A secondary conductor comprising a stator having a stator winding, and a rotor rotating in the stator, the secondary conductor being provided around a rotor yoke constituting the rotor. And a permanent magnet embedded in the rotor yoke, wherein the permanent magnet is magnetized by a current supplied to the stator winding. 2. The induction synchronous motor according to claim 1, wherein said permanent magnet is a rare earth magnet or a ferrite magnet. 3. The stator winding has a single-phase configuration having a main winding and an auxiliary winding, and the permanent magnet is driven by a current supplied to one of the main winding and the auxiliary winding. 3. The induction synchronous motor according to claim 1, wherein the induction synchronous motor is magnetized. 4. The stator winding has a three-phase configuration having a three-phase winding, and the permanent magnet has one or two phases of the stator winding.
3. The induction synchronous motor according to claim 1, wherein the motor is magnetized by a current supplied to the three-phase winding. 4. 5. A varnish or a varnish on the stator winding.
5. The induction synchronous motor according to claim 1, wherein a fixing material that is heated to fuse the winding is applied. 6. The induction synchronous motor according to claim 1, wherein the induction synchronous motor is mounted on a compressor. 7. The induction synchronous motor according to claim 6, wherein the compressor is used for an air conditioner or an electric refrigerator. 8. A secondary conductor comprising a stator having a stator winding and a rotor rotating within the rotor, the secondary conductor being provided around a rotor yoke constituting the rotor. And a magnet material embedded in the rotor yoke, comprising: a magnet material of the permanent magnet embedded in the rotor yoke; A method for manufacturing an induction synchronous motor, comprising: magnetizing the magnet material by applying a current. 9. The method for manufacturing an induction synchronous motor according to claim 8, wherein a rare earth or ferrite material is used as said magnet material. 10. The stator winding has a single-phase configuration having a main winding and an auxiliary winding, and a current is applied to one of the main winding and the auxiliary winding to thereby produce the magnet material. 10. The method for manufacturing an induction synchronous motor according to claim 8, wherein the magnetization is performed. 11. The stator winding has a three-phase configuration including a three-phase winding, and a current is applied to one, two, or three-phase windings of the stator winding. 10. The method of manufacturing an induction synchronous motor according to claim 8, wherein the magnet material is magnetized by the following. 12. A varnish or a fixing material for heating and fusing the windings to the stator windings is applied to the stator windings. Manufacturing method of induction synchronous motor.