JP2002300744A - Induction synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction synchronous motor which significantly improves workability of assembling of its rotor by integrally molding end rings and end surface members to its rotor yoke. SOLUTION: A plurality of secondary conductors 5B which are die-cast- molded are disposed on the periphery of a rotor yoke 5A which constitutes the rotor 5 of the induction synchronous motor 2. The end rings 68 and 69 are integrally die-cast-molded with the secondary conductor 5B on the periphery of both ends of the rotor yoke 5A. Permanent magnets 31 are inserted into slots 44 penetrating into and formed in the rotor yoke 5A. Both end openings of the slots 44 are closed with a pair of end surface members 66 and 67 made of a non-magnetic substance. The end surface members 66 and 67 are fixed to the rotor yoke 5A by both end rings 68 and 69 when molding the secondary conductor 5B and the end rings 68 and 69.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of secondary conductors provided in the periphery of a rotor yoke and die casting integrally formed with the secondary conductor at the periphery of both end surfaces of the rotor yoke. The present invention relates to an induction synchronous motor including a molded end ring and a permanent magnet embedded in a rotor yoke.

[0002]

2. Description of the Related Art Conventionally, for example, in an air conditioner (air conditioner) or a refrigerator (electric refrigerator), a hermetic electric compressor constituting a refrigeration cycle of a cooling device is mounted. As the electric element for driving the compressor, a DC brushless motor or an induction synchronous motor driven by a single-phase or three-phase commercial power supply has been used.

[0003] The rotor of the induction synchronous motor includes a stator having a stator winding and a rotor rotating within the stator. A plurality of secondary conductors located at the periphery of the rotor yoke constituting the rotor are die-cast, and end rings are formed integrally with the secondary conductor at the periphery of both end surfaces of the rotor yoke. Is die cast. Further, a slot is formed through the rotor yoke, a permanent magnet is inserted into the slot, and both ends of the slot are fixed by end members.

[0004]

However, the permanent magnet provided on the rotor is fixed by a rear end face member inserted into a slot provided on the rotor yoke. Also, in order to improve the rotational balance of the rotor, a balancer is mounted near the end ring located at the periphery of the end face of the rotor yoke. After the end ring is die-cast, the end member for fixing the permanent magnet is mounted in the slot, and then the balancer is mounted.Therefore, a great deal of time is required for inserting the permanent magnet into the slot, mounting the end surface member, and mounting the balancer. Was hanging. For this reason,
There is a problem that the workability of the assembly of the induction synchronous electric motor is remarkably deteriorated.

The present invention has been made to solve the problems of the prior art, and greatly improves the workability of assembling a rotor by integrally molding an end ring and an end face member with a rotor yoke. It is an object of the present invention to provide an improved induction synchronous electric motor.

[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 plurality of die-cast secondary conductors located at the periphery of the child yoke; and an end ring die-cast integrally with the secondary conductor located at the periphery of both ends of the rotor yoke. A permanent magnet inserted into a slot formed through the rotor yoke, and a pair of end surface members made of a non-magnetic material that respectively close both end openings of the slot into which the permanent magnet is inserted. The end face members are fixed to the rotor yoke by the end rings when the secondary conductor and the end ring are molded.

According to a second aspect of the present invention, in addition to the above, the induction synchronous motor is mounted on a compressor.

According to a third aspect of the present invention, in addition to the second aspect, the compressor is used for an air conditioner or an electric refrigerator.

According to the present invention, an induction synchronous motor includes a stator having a stator winding and a rotor that rotates within the stator, and a rotor yoke constituting the rotor. A plurality of die-cast secondary conductors located at the periphery,
An end ring that is die-cast integrally with the secondary conductor and is located at a peripheral portion of both ends of the rotor yoke, and a permanent magnet inserted into a slot formed through the rotor yoke. A pair of end face members made of a non-magnetic material for closing both end openings of the slot into which the permanent magnets are inserted, respectively, wherein the both end rings are formed when the secondary conductor and the end ring are molded. The end face members are attached to both ends of the rotor yoke after inserting the permanent magnet into the slot after die-casting the end ring, for example, as in the prior art. It is possible to save the troublesome and troublesome work. Therefore, the productivity of the rotor can be greatly improved.

According to the invention of claim 2, the induction synchronous motor is mounted on the compressor in addition to the above, so that the production cost of the compressor can be greatly reduced.

According to the third aspect of the present invention, in addition to the second aspect, the induction synchronous motor is used for an air conditioner or an electric refrigerator because the compressor is used for an air conditioner or an electric refrigerator. The production cost can be greatly reduced.

[0012]

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 composed of a single-phase two-pole, and is fixed to the inner wall of the closed casing 1, and is rotatably supported inside the stator 4 about 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 the 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 ejection 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 container 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 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 electromagnetic steel plates having a thickness of 0.3 mm to 0.7 mm into a predetermined shape, and caulking each other to form an integral unit. (In addition, it may be integrated by welding without depending on caulking). 66 and 67 are flat end members which are attached to the upper and lower ends of the rotor core 26 and are made of a non-magnetic material such as a stainless steel plate.

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. Is a side view of the rotor 5. FIG. A stator winding 7 is wound around the stator 4,
The lead wire 50 connected to the stator winding 7 and the coil end of the stator winding 7 are together
0, and the lead wire 50 is connected to the sealed terminal 25.

The rotor 5 includes a rotor yoke portion 5A, a cage-shaped secondary conductor 5B which is located 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 size, is die-cast integrally with the cage-shaped secondary conductor 5B, and is permanently embedded in the rotor yoke 5A. And a magnet 31. The permanent magnet 31 is magnetized after a permanent magnet material is inserted into a slot 44 described later. The magnetization is performed by a permanent magnet 31 (31S) embedded on one side (for example, the right side in the drawing) of the rotating shaft 6.
A, 31SB) are the same S pole, and the permanent magnets 31 (31NA, 31N) embedded on the other side (left side in the figure)
B) have the same N pole.

A plurality of cage-shaped secondary conductors 5B are provided around the rotor yoke portion 5A and 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. 5).

A plurality of slots 44 (four in this 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 (FIGS. 6 and 7). When the cage-shaped secondary conductor 5B and the end rings 68 and 69 are die-cast, one end face member 67 is fixed to the rotor yoke 5 by the one end ring 69.
A, and the other end face member 66 is integrally fixed to the rotor yoke 5A by the other end ring 68.

In this case, with the peripheral portions of the end face members 66 and 67 biting into the both end rings 68 and 69,
The rotor yoke 5A, the end rings 68, 69 and the end face members 66, 67 are integrally die-cast. Thereby, both end face members 66 are provided at both ends of the rotor yoke 5A.
67 are fixed, and each permanent magnet 31.
Fixed inside. The permanent magnet 31 is made of a rare earth permanent magnet material such as a praseodymium permanent magnet or a neodymium permanent magnet whose surface is plated with nickel or the like, and has a strong magnetic force. The permanent magnets 31, 31 are provided so as to face the rotating shaft 6, and the facing permanent magnets 31, 31 are embedded with different magnetic poles.

The permanent magnets 31SA and 31SB embedded on one side (for example, the right side and the upper side in the figure) of the rotating shaft 6 are the same S pole, and the permanent magnets embedded on the other side (the left side and the lower side in the figure). 31NA and 31NB 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 with the rotation shaft 6 as the center, and have two different S poles and two different N poles toward the outside of the rotation shaft 6 in the circumferential direction. It is embedded in a polar configuration, and is configured so that a rotational 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 shown in FIGS. 6 and 7 is different from the arrangement of the permanent magnet 31 shown in FIGS. 2, 3 and 4. However, the arrangement of the permanent magnet 31 shown in FIGS. The arrangement may be as shown in FIGS. 2, 3, and 4. Further, the permanent magnets 31 shown in FIGS. 2, 3 and 4 may be arranged as shown in FIGS. 6 and 7.

An air conditioner using a hermetic electric compressor C equipped with such an induction synchronous motor 2 or a refrigerant circuit such as an electric refrigerator (FIG. 8) 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 liquid 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 a solenoid valve 36 from a pipe 29 A on the outlet side of the liquid 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 that has exited the receiver 29 is connected 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. 9 shows an electric circuit diagram of the induction synchronous motor 2. In FIG. 9, a single-phase AC commercial power supply AC
The induction synchronous motor 2 to which power is supplied has a main winding 7A and an auxiliary winding 7B, and the main winding 7A connected to one side of the single-phase AC commercial power supply AC is the other of the single-phase AC commercial power supply AC. It is connected to the. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected in series to the other side of the single-phase AC commercial power supply AC via the PTC 46 and the starting capacitor 48, and the PTC 46 and the starting capacitor 48 are connected.
And an operating capacitor 47 is connected in parallel.

The PTC 46 is a semiconductor element whose resistance increases in proportion to the temperature. When the induction synchronous motor 2 starts, its resistance is low, and when a current flows and heat is generated, the resistance increases.
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 AC, and supplies power to the stator winding 7. It consists of an overload relay that also serves as a protection switch to cut 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 AC 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-heats due to this energization, so that the resistance value increases and almost no current flows through the PTC 46 itself. This allows the starting capacitor 4
8, the 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, the two end face members 66 and 67 are
Since the secondary conductor 5B and the end rings 68, 69 are fixed to the rotor yoke 5A by the end rings 68, 69 at the time of die-casting, the rotor is formed at the time of die-casting the secondary conductor 5B and the end rings 68, 69. Both end face members 66 and 67 can be easily fixed to the yoke portion 5A. Thereby, for example, the end ring 6
After the die casting of 8, 69, the inconvenience and trouble of having to attach the end face members 66, 67 to both ends of the rotor yoke 5A after inserting the permanent magnet 31 into the slot 44 can be saved.

Next, another rotor 5 is shown in FIGS. The balancer 60 for improving the rotational balance of the rotor 5 is provided in the rotor yoke 5A. This balancer 60 is formed by integrally forming an end face member 66 and a balancer, and includes an end face plate portion 60A, a weight portion 60C,
The weight section 60C and the connecting section 60B for connecting the end face plate section 60A are constituted. Weight part 60C
Is formed in a size that can be placed on the end ring 68 and has a substantially semicircular shape.

The end plate member 60A is connected to the end member 6
6 has a shape substantially equivalent to that of the end plate member 60A.
And the weight portion 60C are connected at a connection portion 60B, and the end face plate portion 60A, the weight portion 60C, and the connection portion 60B are integrally formed. The balancer 60
Is cast by casting copper or brass into a mold,
The connection portion 60B is formed inside the end ring 68 with the peripheral edge portion of the end face plate portion 60A biting into the small end ring 68, and the weight portion 60C is formed on the end ring 68.

The balancer 60 molded as described above uses the other end ring 6 when the secondary conductor 5B and both end rings 68, 69 are die-cast.
8, and one end face member 67 is fixed to the rotor yoke 5A by the one end ring 69 as described above. As a result, each of the permanent magnets 31 is connected to the slot 44 of the rotor yoke 5A.
Fixed inside.

As described above, the balancer 60 and the end face member 67
Are fixed to the rotor yoke 5A during die-casting of the secondary conductor 5B and both end rings 68, 69, so that the secondary conductor 5B and both end rings 68, 69 are fixed as in the prior art.
After die casting with 69, a plurality of permanent magnets 31
Is inserted into the slot 44 and then the end face members 66 and 67 must be attached to both ends of the rotor yoke 5A.

In this embodiment, stainless steel plates are used for the end members 66 and 67 for holding down the permanent magnet 31. However, if an aluminum plate through which current easily flows is used for the end members 66 and 67, the secondary resistance is reduced. And the driving performance can be greatly improved. In addition, the end members 66 and 67 may be made of copper, brass or the like other than the aluminum plate.

In the embodiment, the rotary compressor is used as an example of the hermetic electric compressor C. However, the present invention is not limited to this, but is also applicable to a hermetic scroll compressor having a pair of meshing meshes. .

[0038]

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 plurality of die-cast secondary conductors are located at the periphery of the rotor yoke to be formed, and are die-cast integrally with the secondary conductors located at the periphery of both end faces of the rotor yoke. A pair of end face members comprising an end ring, a permanent magnet inserted into a slot formed through the rotor yoke portion, and a non-magnetic material respectively closing both end openings of the slot into which the permanent magnet is inserted. Since the both end face members are fixed to the rotor yoke portion by the both end rings at the time of molding the secondary conductor and the end ring, for example, after conventional die-casting of the end ring, Slow permanent magnet After inserting the bets across the rotor yoke it is possible to omit the trouble and effort must be attached to the end faces. Therefore, the productivity of the rotor can be greatly improved.

According to the second aspect of the present invention, since the induction synchronous motor is mounted on the compressor in addition to the above, the production cost of the compressor can be greatly reduced. .

According to a third aspect of the present invention, in addition to the second aspect, the induction synchronous motor is an air conditioner,
Alternatively, since it is used for an electric refrigerator, the production cost of an air conditioner or an electric refrigerator can be significantly reduced.

[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 side view of the rotor.

FIG. 6 is a top view of the rotor.

FIG. 7 is a partial longitudinal side view of the rotor of FIG. 6;

FIG. 8 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. 9 is an electric circuit diagram of the induction synchronous motor.

FIG. 10 is a top view of the rotor showing a state in which the end face member is integrated with the balancer and fixed to the rotor yoke.

FIG. 11 is a partial longitudinal side view of the rotor of FIG. 10;

[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 7 Stator winding 7A Main winding 7B Auxiliary winding 26 Rotor core 28 Condenser 29 Liquid receiver REFERENCE SIGNS LIST 31 permanent magnet 31SA permanent magnet 31SB permanent magnet 31NA permanent magnet 31NB permanent magnet 38 evaporator 44 slot 49 power switch 60 balancer 60A end plate member 60B connection portion 60C weight portion 66 end member 67 end member 68 end ring 69 end ring C hermetic type Electric compressor AC single-phase AC commercial power supply

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 21/14 H02K 21/14 M 21/46 21/46 (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 Nonodera 2-5-5-Keihanhondori, Moriguchi-shi, Osaka Inside 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 Osaka 2-5-5 Keihanhondori, Moriguchi-shi F-term (reference) in Sanyo Electric Co., Ltd. CB06 PP11 QB03

Claims (3)

[Claims] 1. A stator having a stator winding and a rotor rotating within the stator, the die-casting molding being located at a peripheral portion of a rotor yoke constituting the rotor. A plurality of secondary conductors; an end ring positioned at the periphery of both end surfaces of the rotor yoke and die-cast integrally with the secondary conductor; and a slot formed through the rotor yoke. And a pair of end face members made of a non-magnetic material that respectively close both end openings of the slot into which the permanent magnet is inserted, wherein the end face members are the secondary conductor and the end. An induction synchronous motor, wherein the ring is fixed to the rotor yoke by the two end rings during molding. 2. The induction synchronous motor according to claim 1, wherein the induction synchronous motor is mounted on a compressor. 3. The induction synchronous motor according to claim 2, wherein the compressor is used for an air conditioner or an electric refrigerator.