JP2002300763A - Drive device for induction synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device for induction synchronous motor whose power consumption is small in steady operation and the driving torque has a high efficiency when starting. SOLUTION: The induction synchronous motor 2 is constituted of a stator 4 having a stator winding 7 comprising a main winding 7A and an auxiliary winding 7B, and a rotor 5 rotating inside the stator 4, a secondary conductor 5B disposed in the periphery of the rotor yoke 5A consisting of the rotor 5, and permanent magnets 31 embedded in the rotor yoke 5A. An operating capacitor 47 is connected to the auxiliary winding 7B. A serial circuit of a starting capacitor 48 and a PTC 46 are parallel-connected to the operating capacitor 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device used for an induction synchronous motor used in an air conditioner or a refrigerator.

[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. The induction synchronous motor has a small operating torque at the time of starting, and generally operates at a predetermined steady operating torque during a normal operation.

[0003]

However, since an air conditioner or an electric refrigerator requires a large operating torque at the time of starting, a motor having a large operating torque which is larger than a steady operating torque required at the time of normal operation is mounted. I was If the operating torque of such an induction synchronous motor at the time of starting is increased, the power consumption during normal operation is also increased. For this reason, considering high efficiency due to recent energy regulations, etc., the operating torque at start-up of the electric motor used for the hermetic electric compressor constituting a refrigeration cycle such as a refrigerator or an air conditioner is not necessarily sufficient. Did not. Therefore, power consumption during normal operation is small,
Needless to say, there has been a demand for the development of a drive device for an induction synchronous motor that can ensure the operating torque at the time of starting.

The present invention has been made to solve the problems of the prior art, and is intended to drive an induction synchronous motor having low power consumption during normal operation and high operating torque at startup. It is intended to provide a device.

[0005]

That is, a driving apparatus for an induction synchronous motor according to the present invention comprises a stator having a stator winding composed of a main winding and an auxiliary winding, and a rotation rotating in the stator. And a secondary conductor provided around the rotor yoke portion constituting the rotor, and a permanent magnet embedded in the rotor yoke portion, and connected to the auxiliary winding. And a series circuit of a starting capacitor and a PTC connected in parallel to the operating capacitor.

According to a second aspect of the present invention, there is provided a drive device for an induction synchronous motor comprising a stator having a stator winding composed of a main winding and an auxiliary winding, and a rotor rotating within the stator. An operation connected to the auxiliary winding, comprising: a secondary conductor provided around a rotor yoke section constituting the rotor; and a permanent magnet embedded in the rotor yoke section. And a PTC connected in parallel to the operating capacitor.

According to a third aspect of the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding including a main winding and an auxiliary winding, and a rotor rotating within the stator. An operation connected to the auxiliary winding, comprising: a secondary conductor provided around a rotor yoke section constituting the rotor; and a permanent magnet embedded in the rotor yoke section. It comprises a capacitor and a series circuit of a starting capacitor and a starting relay contact connected in parallel to the operating capacitor.

According to a fourth aspect of the present invention, there is provided an induction synchronous motor driving apparatus including a stator having a stator winding including a main winding and an auxiliary winding, and a rotor rotating within the stator. An operation connected to the auxiliary winding, comprising: a secondary conductor provided around a rotor yoke section constituting the rotor; and a permanent magnet embedded in the rotor yoke section. It has a capacitor.

According to the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding including a main winding and an auxiliary winding, and a rotor rotating in the stator.
An operating capacitor connected to the auxiliary winding, comprising a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke. And a series circuit of a starting capacitor and a PTC connected in parallel to the operating capacitor, so that an operating capacitor connected to the auxiliary winding and a series circuit of the starting capacitor and the PTC connected in parallel to the operating capacitor are provided. It is possible to increase the operating torque at the time of starting the induction synchronous motor having the above. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency.
Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

According to the second aspect of the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding including a main winding and an auxiliary winding, and a rotor rotating within the stator. And a secondary conductor provided around the rotor yoke section constituting the rotor, and a permanent magnet embedded in the rotor yoke section, and connected to the auxiliary winding. Since an operation capacitor and a PTC connected in parallel to the operation capacitor are provided, when starting an induction synchronous motor having an operation capacitor connected to the auxiliary winding and a PTC connected in parallel to the operation capacitor, It is possible to increase the operating torque of the motor. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency.
Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

According to the third aspect of the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding including a main winding and an auxiliary winding, and a rotor rotating within the stator. And a secondary conductor provided around the rotor yoke section constituting the rotor, and a permanent magnet embedded in the rotor yoke section, and connected to the auxiliary winding. Since an operating capacitor and a series circuit of a starting capacitor and a starting relay contact connected in parallel to the operating capacitor are provided, an operating capacitor connected to the auxiliary winding, a starting capacitor connected in parallel to the operating capacitor, It is possible to increase the operating torque at the time of starting of the induction synchronous motor having the series circuit of the starting relay contacts. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency. Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

According to a fourth aspect of the present invention, there is provided a drive device for an induction synchronous motor, comprising: a stator having a stator winding including a main winding and an auxiliary winding; and a rotor rotating within the stator. And a secondary conductor provided around the rotor yoke section constituting the rotor, and a permanent magnet embedded in the rotor yoke section, and connected to the auxiliary winding. The provision of the operation capacitor makes it possible to increase the operation torque at the time of starting the induction synchronous motor having the operation capacitor connected to the auxiliary winding. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency. Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

[0013]

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. A stator 4 is rotatably supported inside the stator 4 about a rotation 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 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 60 denotes a balancer for improving the rotational balance of the rotor 5.

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 out an electromagnetic steel sheet having a thickness of 0.3 mm to 0.7 mm into a predetermined shape, and caulking each other to form an integral body. (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. 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 are formed in a cage shape (not shown) 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).

The rotor yoke 5A is provided with a plurality of slots 44 (four in the present embodiment) which are vertically formed and open at both ends thereof. Each is closed at 67 (FIGS. 6 and 7). Then, during die-casting of the cage-shaped secondary conductor 5B and the end rings 68, 69, one end face member 6 is formed.
7 is connected to the rotor yoke 5 by one end ring 69.
It is fixed to A. Further, the other end member 66 is fixed to the rotor yoke 5A with a plurality of rivets 66A.

In this case, after the permanent magnet 31 is inserted from the opening of the slot 44, the opening is closed by the other end member 66, and the end member 66 is connected to the rotor yoke 5A by rivets 66A. Are fixed by caulking in the engagement holes 5C provided in the holes, so that the permanent magnets 31 are fixed in the slots 44. 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. These permanent magnets 31, 3
Numeral 1 is provided to face the rotating shaft 6, and the permanent magnets 31, 31 facing each other 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. In this case rivet 6
It is necessary to change the swaging position of 6A. 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 flowing out of the 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. 9 shows an electric circuit diagram of the driving device T1 of the induction synchronous motor 2. In FIG. 9, an induction synchronous motor 2 supplied with power from a single-phase AC commercial power supply AC includes a stator winding 7 including a main winding 7A and an auxiliary winding 7B. The connected main winding 7A is connected to the other of the single-phase AC commercial power supply AC via the socket terminal 51. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to the other of the single-phase AC commercial power supply AC via the socket terminal 51 and the operation capacitor 47. 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 operation capacitor 47 is connected to the induction synchronous motor 2.
The capacitor capacity is set so as to be suitable for starting and steady-state operation.

When the power switch 49 is closed and power is supplied from the single-phase AC commercial power supply AC, a parallel circuit of the operation capacitor 47 and the main winding 7A is connected to the auxiliary winding 7B. The induction synchronous motor 2 starts the starting operation by obtaining the starting operation torque based on the current phase difference between the line 7A and the auxiliary winding 7B, and continues the current level between the main winding 7A and the auxiliary winding 7B by the operation capacitor 47. The induction synchronous motor 2 continues the steady operation due to the phase difference. In this case, the operating condenser 47 also serves as a starting condenser.

FIG. 10 shows an electric circuit diagram of another driving device T2 of the induction synchronous motor 2. In FIG. 10, the induction synchronous motor 2 supplied with electric power from the single-phase AC commercial power supply AC has a stator winding 7 including a main winding 7A and an auxiliary winding 7B as described above. Is connected to a single-phase AC commercial power supply AC via a power switch 49. Main winding 7A connected to one of single-phase AC commercial power supply AC is connected to the other of single-phase AC commercial power supply AC via socket terminal 51. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC includes a socket terminal 51 and a relay coil 4 of the starting relay 45.
It is connected to the power switch 49 via 5A.

The auxiliary winding 7B is connected in series to the other of the single-phase AC commercial power supply AC via the socket terminal 51, the starting relay contact 45B of the starting relay 45, and the starting capacitor 48. An operation capacitor 47 is connected in parallel with the capacitor 48. The operation condenser 47 is set to a capacity suitable for steady operation, and the operation condenser 47 and the starting condenser 4
8 are connected in parallel, and these capacitors 4
7, 48 are set to a capacity suitable for starting. During the starting operation in which a large current flows through the induction synchronous motor 2 through the relay coil 45A, almost no current flows and the starting relay contact 45
With B closed, in the process of shifting to the steady operation of the induction synchronous motor 2, a current flows through the relay coil 45A, and the starting relay contact 45B is opened to disconnect the starting capacitor 48.

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 a large current flows through the auxiliary winding 7B when the induction synchronous motor 2 starts, almost no current flows through the relay coil 45A. Therefore, the starting relay contact 45B of the starting relay 45 remains closed, and the auxiliary winding 7B is connected in parallel. Starting induction 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 operating. Then, in the process of the induction synchronous motor 2 shifting to the steady operation, the current flowing through the auxiliary winding 7B decreases, whereby the current flows through the relay coil 45A, and the magnetomotive force of the relay coil 45A opens the power switch 49 to start. The 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.
Note that current control using a thyristor may be performed instead of the starting relay 45.

FIG. 11 shows an electric circuit diagram of another driving device T3 of the induction synchronous motor 2. In FIG. 11, an induction synchronous motor 2 supplied with electric power from a single-phase AC commercial power supply AC has a stator winding 7 including a main winding 7A and an auxiliary winding 7B as described above. Is connected to a single-phase AC commercial power supply AC via a power switch 49. Main winding 7A connected to one side of single-phase AC commercial power supply AC is connected to the other of single-phase AC commercial power supply AC. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to the other of the single-phase AC commercial power supply AC via a positive-characteristic thermistor 46 (hereinafter abbreviated as PTC). An operation capacitor 47 is connected in parallel. 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.

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, and the induction synchronous motor 2 starts to start.
When the induction synchronous motor 2 is started at the beginning, a large current flows through the PTC 46 because the temperature of the PTC 46 is low and the resistance value is low, so that a large current also flows through the auxiliary winding 7B (in this case, the current flowing through the operation capacitor 47 is The induction synchronous motor 2 is started. With this energization, PTC4
6 self-heats, the resistance value increases, and eventually P
The current hardly flows through the TC 46 itself, and the induction synchronous motor 2 continues the steady operation due to the current phase difference between the main winding 7A and the auxiliary winding 7B due to the operation capacitor 47.

FIG. 12 shows an electric circuit of another driving device T4 of the induction synchronous motor 2. In FIG.
The induction synchronous motor 2 supplied with electric power from the single-phase AC commercial power supply AC has a stator winding 7 composed of a main winding 7A and an auxiliary winding 7B as described above, and the stator winding 7 is connected to a power switch 49. Is connected to a single-phase AC commercial power supply AC. Main winding 7 connected to one side of single-phase AC commercial power supply AC
A is connected to the other of the single-phase AC commercial power supply AC. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected in series to the other of the single-phase AC commercial power supply AC via the PTC 46 and the starting capacitor 48, and the PTC 46, the starting capacitor An operation capacitor 47 is connected in parallel with 48.

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 thereof is low, so that the PTC 4
6, a large current also flows through the auxiliary winding 7B, and the auxiliary winding 7B is started by a current phase difference between the operating capacitor 47 and the starting capacitor 48 connected in parallel with the main winding 7A. Upon obtaining the torque, the induction synchronous motor 2 starts the starting operation. And, by this energization, PTC
Since 46 generates heat, the resistance value increases, and almost no current flows through the PTC 46 itself. As a result, the starting condenser 48 is disconnected and the operating condenser 4
7, the induction synchronous motor 2 continues the steady operation by the current phase difference between the main winding 7A and the auxiliary winding 7B.

The driving devices T1, T2, T3,
FIG. 13 shows the relationship between the rotational torque T and the rotational speed n by each electric circuit of T4. In the figure, the vertical axis represents the rotational torque T, the lower part represents a small rotational torque T, and the upper part represents the large rotational torque T. The horizontal axis indicates the rotational speed n, the left side indicates a low rotational speed n, and the right side indicates a high rotational speed n. The dashed line indicates the rotation torque T of the driving device T1 with respect to the rotation speed n, and the solid line indicates the rotation torque T of the driving device T3 with respect to the rotation speed n. The dotted line indicates the rotational torque T with respect to the rotational speed n of the driving device T4,
The alternate long and short dash line indicates the rotational torque T with respect to the rotational speed n of the driving device T2.

As can be seen from this figure, the driving device T1 in which the starting capacitor 48 and the operating capacitor 47 are combined into one capacitor has a low starting operating torque and a steady operating torque, but the starting relay 45 and other elements can be omitted. It is used for equipment such as an air conditioner having a relatively small starting operation torque and a steady operation torque, or an electric refrigerator.

The driving device T2, which switches between the starting capacitor 48 and the operating capacitor 47 by the starting relay 45, has a high starting operating torque and a high rotation speed n of the induction synchronous motor 2, and is operated in the process of shifting to a steady operation. Since a current flows through the coil 45A and the starting relay contact 45B is opened to disconnect the starting capacitor 48, the same operation as the rotating torque T with respect to the rotational speed n of the driving device T3 is performed thereafter. This makes it possible to increase the operating torque at the time of starting the induction synchronous motor 2 and reduce the power consumption during the normal operation, so that the induction synchronous motor 2 can be operated with extremely high efficiency. It becomes possible. Since such a driving device T2 has a high starting operation torque and a steady operation torque, it is used for an apparatus such as an air conditioner or an electric refrigerator having a relatively large start operation torque and a steady operation torque.

Further, in the driving device T3 using the PTC 46, which is a semiconductor element whose resistance value increases in proportion to the temperature, and the operating capacitor 47, the rotating torque T at the time of starting is higher than that of the driving device T1, and the starting relay 45 and other components are used. And high reliability can be ensured. This makes it possible to increase the operating torque at the time of starting the induction synchronous motor 2 and reduce the power consumption during the normal operation, so that the induction synchronous motor 2 can be operated with extremely high efficiency. It becomes possible. Such a driving device T3 is used for devices such as an air conditioner or an electric refrigerator which require relatively low starting operation torque and steady operation torque and require high reliability.

The driving device T4 using the PTC 46 which is a semiconductor element whose resistance value increases in proportion to the temperature and the starting capacitor 48 and the operating capacitor 47 has a higher rotating torque T at the start than the driving device T3. High reliability can be secured. This makes it possible to increase the operating torque at the time of starting the induction synchronous motor 2 and reduce the power consumption during the normal operation, so that the induction synchronous motor 2 can be operated with extremely high efficiency. It becomes possible. Such a driving device T4 is used for an apparatus such as an air conditioner or an electric refrigerator which requires a relatively high starting operation torque and a steady operation torque and requires high reliability.

On the other hand, FIG. 14 shows an air conditioner using a hermetic electric compressor C on which the induction synchronous motor 2 is mounted.
Alternatively, another refrigerant circuit such as an electric refrigerator is shown.
The refrigerant circuit is obtained by adding a liquid injection circuit 58 to the refrigerant circuit shown in FIG. 8, and a liquid receiver (receiver tank) 29 provided in the refrigerant circuit is sealed via a strainer 52, an electromagnetic valve 53, and a capillary tube 54. Connected to the compressor 3 of the electric compressor C.

The solenoid valve 53 is connected to the pipe 27 on the discharge side of the compressor 3.
Is automatically connected to the thermo sensor 57 connected to the thermo sensor 57, and the opening is automatically adjusted based on the temperature detected by the thermo sensor 57. Then, 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 to the first rotary cylinder 9 and the second rotary cylinder 10. Then, it is compressed in two stages and discharged from the discharge pipe 22 to the pipe 27. The compressed gas refrigerant discharged into the pipe 27 flows into the condenser 28, where it radiates heat and is condensed to become a liquid refrigerant and flows into the receiver 29. Part of the liquid refrigerant that has flowed out of the liquid receiver 29 also flows into the liquid injection circuit 58, is throttled by the capillary tube 54 via the strainer 52 and the electromagnetic valve 53, and is then discharged into the compressor 3. The liquid refrigerant discharged into the compressor 3 evaporates there, exerts an endothermic effect to cool the compressor 3, and protects the compressor 3 by preventing a rise in the temperature of the compressor 3 during the cooling operation. Other operations similar to those described above are performed.

In the embodiment, the 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 for the hermetic scroll compressor comprising a pair of meshes meshing with each other. The present invention is also effective for a drive device of a C induction synchronous motor.

[0046]

As described above in detail, according to the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding composed of a main winding and an auxiliary winding, and a rotating unit in the stator. A secondary conductor provided around a rotor yoke portion constituting the rotor, a permanent magnet embedded in the rotor yoke portion, and the auxiliary winding , And a series circuit of the starting capacitor and the PTC connected in parallel to the operating capacitor, so that the operating capacitor connected to the auxiliary winding and the starting capacitor connected in parallel to the operating capacitor are provided. Capacitor and PTC
It is possible to increase the operating torque at the start of the induction synchronous motor having the series circuit of As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency. Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

According to a second aspect of the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding composed of a main winding and an auxiliary winding, and a rotation rotating in the stator. And a secondary conductor provided around the rotor yoke portion constituting the rotor, and a permanent magnet embedded in the rotor yoke portion, and connected to the auxiliary winding. Operating capacitor and a P connected in parallel with the operating capacitor.
And an operating capacitor connected to the auxiliary winding and a PTC connected in parallel to the operating capacitor.
It is possible to increase the operating torque at the time of starting the induction synchronous motor having the above. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency. Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

According to the third aspect of the present invention, a drive device for an induction synchronous motor includes a stator having a stator winding composed of a main winding and an auxiliary winding, and a rotation rotating in the stator. And a secondary conductor provided around the rotor yoke portion constituting the rotor, and a permanent magnet embedded in the rotor yoke portion, and connected to the auxiliary winding. Operating capacitor, and a series circuit of a starting capacitor and a starting relay contact connected in parallel to the operating capacitor, so that an operating capacitor connected to the auxiliary winding and a starting capacitor connected in parallel to the operating capacitor are provided. It is possible to increase the operating torque at the time of starting of the induction synchronous motor including the series circuit of the capacitor and the starting relay contact. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency. Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

According to a fourth aspect of the present invention, there is provided a driving device for an induction synchronous motor, comprising: a stator having a stator winding comprising a main winding and an auxiliary winding; And a secondary conductor provided around the rotor yoke portion constituting the rotor, and a permanent magnet embedded in the rotor yoke portion, and connected to the auxiliary winding. Since the operating capacitor is provided with the operating capacitor, the operating torque at the time of starting the induction synchronous motor having the operating capacitor connected to the auxiliary winding can be increased. As a result, it is possible to reduce the power consumption during normal operation, and to provide a drive device that can operate the induction synchronous motor with extremely high efficiency. Therefore, the efficiency of the induction synchronous motor during operation can be greatly improved.

[Brief description of the drawings]

FIG. 1 is an example of a vertical sectional side view of a hermetic electric compressor to which a drive device for 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 vertical sectional side view of the rotor of FIG. 6;

FIG. 8 is a refrigerant circuit diagram of an air conditioner using an hermetic electric compressor equipped with an induction synchronous motor or an electric refrigerator.

FIG. 9 is an electric circuit diagram of the drive device for the induction synchronous motor of the present invention.

FIG. 10 is an electric circuit diagram of another drive device for the induction synchronous motor.

FIG. 11 is an electric circuit diagram of another drive device for the induction synchronous motor.

FIG. 12 is an electric circuit diagram of another drive device for the induction synchronous motor.

FIG. 13 is a diagram showing a relationship between a rotation torque and a rotation speed by each electric circuit of each drive device.

FIG. 14 is another refrigerant circuit diagram of an air conditioner using an hermetic electric compressor equipped with an induction synchronous motor or an electric refrigerator.

[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 Liquid receiver 31 Permanent magnet 38 Evaporator 45 Starting relay 45A Relay coil 45B Starting relay contact 46 PTC 47 Operating capacitor 48 Starting capacitor 49 Power switch C Hermetic electric compressor AC Single-phase AC commercial power supply T1 Driver T2 Driver T3 Drive T4 Drive

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H02K 1/27 H02K 17/08 A 17/08 F04B 49/02 331B (72) Inventor Masaaki Takezawa Keihanmoto, Moriguchi-shi, Osaka 2-5-5, Sanyo Electric Co., Ltd. (72) Inventor Kazuhiko Arai 2-5-5, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Eiichi Murata, Moriguchi-shi, Osaka 2-5-5 Keihan Hondori Sanyo Electric Co., Ltd. (72) Inventor Noboru Nonodera 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shigemi Koiso Osaka 2-5-5 Keihanhondori, Moriguchi-shi, Sanyo Electric Co., Ltd. (72) Inventor Kazuhiro Enomoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Nakayama Zentomo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term (reference) in Sanyo Electric Co., Ltd. 3H029 AA04 AA09 AA13 AB03 BB41 BB42 BB5 4 CC07 CC27 3H045 AA05 AA09 AA13 AA27 BA04 CA28 DA00 EA34 5H002 AA01 AA07 AB04 AB08 AC03 AC06 AC08 5H621 BB07 BB08 GA01 HH01 JK03 JK14 5H622 CA02 CA07 CA10 CA13 CB03 PP03 PP10 PP12 PP14 QB01 QB08

Claims (4)

[Claims] A stator having a stator winding comprising a main winding and an auxiliary winding; and a rotor rotating within the stator. In an induction synchronous motor including a secondary conductor provided in a peripheral portion, and a permanent magnet embedded in the rotor yoke, an operation capacitor connected to the auxiliary winding; A driving device for an induction synchronous motor, comprising: a starting capacitor and a series circuit of a PTC connected thereto. 2. A rotor yoke section comprising a stator having a stator winding comprising a main winding and an auxiliary winding, and a rotor rotating in the stator. In an induction synchronous motor including a secondary conductor provided in a peripheral portion, and a permanent magnet embedded in the rotor yoke, an operation capacitor connected to the auxiliary winding; A driving device for an induction synchronous motor, comprising: a connected PTC. 3. A rotor yoke portion comprising a stator having a stator winding comprising a main winding and an auxiliary winding, and a rotor rotating within the stator. In an induction synchronous motor including a secondary conductor provided in a peripheral portion, and a permanent magnet embedded in the rotor yoke, an operation capacitor connected to the auxiliary winding; A driving device for an induction synchronous motor, comprising a series circuit of a starting capacitor and a starting relay contact connected thereto. 4. A rotor yoke portion comprising a stator having a stator winding comprising a main winding and an auxiliary winding, and a rotor rotating in the stator. An induction synchronous motor comprising: a secondary conductor provided in a peripheral portion; and a permanent magnet embedded in the rotor yoke, wherein an operation capacitor connected to the auxiliary winding is provided. Drive device for induction synchronous motor.