JP2003278653A - Refrigerant compressing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant compressing device capable of continuously operating even when a permanent magnet synchronous electric motor drive power supply device breaks down in the refrigerant compressing device driving a compressing mechanism part by the permanent magnet synchronous electric motor. <P>SOLUTION: The refrigerant compressing device has a compression mechanism 4 accommodated in an airtight container 1 and compressing the refrigerant, and an electric motor part 10 driving the compression mechanism 4. The electric motor part 10 is equipped with a stator 12 having a coil 13 connected to an external power supply, and a rotor 11 having short circuit rings 31A, 31B which short-cut the permanent magnets 18, 19 and a plurality of conductor bars 32 and each conductor bar provided inside an iron core 30 as well as connected to the compression mechanism 4 arranged opposing to the stator 12 through a shaft 6. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refrigerant compression device,
In particular, the present invention relates to a refrigerant compression device that drives a refrigerant compression mechanism by a permanent magnet synchronous motor.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a structure of a scroll type refrigerant compression device disclosed in, for example, Japanese Patent Laid-Open No. 8-14169. In this figure, 1 is a closed container, 2 is a fixed scroll provided on the upper part of the closed container 1, 3 is an orbiting scroll which forms a compression mechanism part 4 together with the fixed scroll, and will be described later on the other surface of the compression mechanism part. It has a hollow shaft portion 5 for coupling with a shaft. Reference numeral 6 denotes a shaft that engages with the hollow shaft portion 5 through a bearing 7 to drive the orbiting scroll 3, 8 denotes a first frame that supports the orbiting scroll 3 and the shaft 6, and 9 denotes a lower portion of the closed container 1. The second frame 10 for supporting the shaft 6 at 10 is the closed container 1.
Is an electric motor part that is provided in the middle part of the rotor 6 and that drives the shaft 6 to rotate. The rotor 11 is fixed to the shaft 6 by means such as shrinkage fitting, and as will be described later, the rotor 11 is provided with the permanent magnet and the periphery thereof. And the stator 12 formed as a permanent magnet synchronous motor. 13 is a coil wound around the stator 12, 14 is a terminal for connecting the coil to an external power source, 15 is a lead wire for connecting the terminal 14 and the coil 13, and 16 is a lubricating oil provided at the lower end of the closed container 1. The oil sump 17 is a through hole provided in the shaft 6, and constitutes a lubricating oil passage for drawing up the lubricating oil in the oil sump 16 by an oil pump (not shown) and supplying it to the upper bearing 7 and the like.

FIG. 5 is an explanatory view for explaining the sectional structure of the rotor 11 of the electric motor unit 10 and the principle of generating a driving force as a permanent magnet synchronous electric motor. That is, as shown in FIG. 5A, the rotor 11 includes a permanent magnet 18 having an N pole on the surface side of the iron core and an S pole on the shaft side, and an S pole on the surface side of the iron core and an N pole on the shaft side, as shown in FIG. Two permanent magnets 19 and two permanent magnets are alternately arranged in the circumferential direction or the rotation direction as shown in the figure, and the permanent magnet synchronous motor driving power supply device (not shown) causes the coil 13 of the stator 12 to move to the coil 13.
As shown in (b), electric power is supplied to induce magnetic fields 20 and 21 having polarities opposite to those of the permanent magnets 18 and 19 on the iron core surface side, and arrows 20A and 21A shown in FIG. , The magnetic field 20, 2 of the coil 13 of the stator 12
By setting 1 as a rotating magnetic field that rotates in the direction of arrow 11A indicating the rotating direction of the rotor 11, the permanent magnets 18 and 19 of the rotor 11 are attracted to the rotating magnetic fields 20 and 21 of the coil 13 of the stator 12, respectively, and 11 rotates and passes through the shaft 6 and scroll type compression mechanism 4
To drive.

[0004]

The conventional refrigerant compression device is constructed as described above, and a permanent magnet synchronous motor drive power supply device is installed to control the electric power supplied to the coil 13 of the stator, so that each rotor rotor is controlled. Since the rotating magnetic field having a polarity opposite to the polarity of the permanent magnet on the surface side of the iron core is induced corresponding to each permanent magnet, when the permanent magnet synchronous motor drive power supply device fails, the refrigerant compression device is operated. Therefore, there is a problem that the air conditioning cannot be controlled because the temperature of the freezing room in the refrigerating apparatus rises.

The present invention has been made in order to solve the above-mentioned problems, and is a highly reliable refrigerant compression device capable of continuing the operation even when the permanent magnet synchronous motor drive power supply device fails. The purpose is to provide.

[0006]

A refrigerant compression device according to the present invention is a refrigerant compression device having a compression mechanism portion housed in a closed container for compressing a refrigerant and an electric motor portion for driving the compression mechanism portion. The electric motor unit includes a stator having a coil connected to an external power source, a permanent magnet and a plurality of conductor bars provided inside the iron core, the stator being opposed to the stator and coupled to the compression mechanism unit via a shaft. And a rotor having a short-circuit ring that short-circuits the conductor bars.

In the refrigerant compression device according to the present invention, the electric motor section is also provided with a stator having a coil connected to an external power source, and the stator is arranged so as to face the stator and is coupled to the compression mechanism section via a shaft. One rotor is equipped with a permanent magnet inside the iron core, the other rotor is equipped with multiple conductor bars inside the iron core, and a short-circuit ring that short-circuits the conductor bars at both ends of the iron core. Is provided.

In the refrigerant compressor according to the present invention, the permanent magnet is a permanent magnet having an N pole on the surface side of the iron core and an S pole on the shaft side, and a permanent magnet having an S pole on the surface side of the iron core and an N pole on the shaft side. The permanent magnets are alternately arranged in the rotation direction.

In the refrigerant compressor according to the present invention, the plurality of conductor bars are provided on the outer peripheral side of the permanent magnet.

In the refrigerant compressor according to the present invention, the compression mechanism section is a scroll compressor.

In the refrigerant compressor according to the present invention, the electric motor section can be switched and connected to a permanent magnet synchronous motor drive power source device or a commercial AC power source by a changeover switch.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 in which the present invention is applied to a scroll compressor will be described below with reference to the drawings. 1A and 1B show the configuration of a rotor of an electric motor unit that constitutes a main part of the first embodiment. FIG. 1A is a schematic diagram showing the external configuration of the rotor, and FIG. 1B is a line AA of FIG. FIG. Since the configuration of the refrigerant compression device other than the rotor of the electric motor unit is the same as that in FIG. 4, the description thereof will be omitted by using FIG. In FIG. 1, 6 is a shaft, 1
Reference numeral 1 denotes a rotor fixed to the shaft 6, which is composed of each member described below. That is, 30 is a laminated electromagnetic steel plate (hereinafter referred to as an iron core), 31A and 31B are provided at both ends of the iron core 30, respectively, and a short-circuit ring for short-circuiting a plurality of conductor bars described later, and 18 and 19 are provided inside the iron core 30. The permanent magnet is formed in the same manner as the permanent magnet of the rotor in the conventional electric motor unit shown in FIG.

Reference numeral 32 denotes a plurality of conductor bars provided on the outer peripheral sides of the permanent magnets 18 and 19, which are arranged along the surface of the iron core 30 and whose both ends are connected to the short-circuit rings 31A and 31B, respectively. It is short-circuited and forms the rotor conductor of the known squirrel cage induction motor. That is, the configuration as an induction motor is added to the conventional permanent magnet synchronous motor. FIG. 2 shows an example of a power supply circuit for the electric motor unit 10 of the present embodiment, where 33 is a three-phase commercial AC power supply and 34 is a permanent magnet synchronous motor drive power supply connected to the three-phase commercial AC power supply 33. In the device, a rotating magnetic field similar to the above-described conventional device is applied to the coil 13 of the stator of the electric motor unit. A changeover switch 35 is connected to the three-phase commercial AC power supply 33 between the permanent magnet synchronous motor driving power supply device 34 and the electric motor unit 10 and via the wiring 36 to connect the electric motor unit 10 to the permanent magnet synchronous motor driving power supply device 34 or The three-phase commercial AC power source 33 can be switched and connected.

Next, the operation of this embodiment will be described. Since the changeover switch 35 is normally connected to the permanent magnet synchronous motor drive power supply device 34, when the power switch (not shown) of the refrigerant compression device is turned on, the permanent magnet synchronous motor is added to the coil 13 of the stator of the electric motor unit 10. Electric power is supplied from the driving power supply device 34, the electric motor unit 10 is driven as a permanent magnet synchronous electric motor, and the refrigerant compression device is operated, as described above. However, if the permanent magnet synchronous motor drive power supply device 34 fails for some reason and power cannot be supplied by this device, the changeover switch 35 is switched to the wiring 36 side so that the electric motor unit 10 is switched to the three-phase commercial AC power supply 33. Connect to. In this case, the voltage of the three-phase commercial AC power supply 33 is applied to the coil 13 of the stator 12 of the electric motor unit 10 to induce the rotating magnetic field.
The magnetic poles of the rotating magnetic field of 2 are the permanent magnets 18 and 19 in the rotor.
Since the polarity corresponding to the polarity of No. 2, that is, the polarities indicated by 20, and 21 in FIG. 5 is not obtained, the driving force as the permanent magnet synchronous motor cannot be obtained. However, the stator 12
When the rotating magnetic field of 1 crosses the plurality of conductor bars 32 of the rotor 11, a secondary current is induced in the closed circuit formed by the conductor bars 32 and the short-circuit rings 31A and 31B.
The driving force generated by the secondary current and the rotating magnetic field of the stator 12 activates the motor unit 10 as an induction motor,
The refrigerant compression device can be operated.

Embodiment 2. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows the second embodiment.
2A is a schematic view showing the outer appearance of the rotor, FIG. 2B is a sectional view taken along the line BB of FIG. 2A, and FIG. (A) C
It is sectional drawing in the -C line. Since the configuration of the refrigerant compression device other than the rotor of the electric motor unit is the same as that in FIG. 4, the description thereof will be omitted by using FIG. In FIG. 3, 6 is a shaft, 11 is a rotor fixed to the shaft 6, and is composed of a first rotor 11B and a second rotor 11C provided with a slight gap therebetween. It is structured as described. That is, as shown in FIG. 3B, in the first rotor 11B, permanent magnets 18 and 19 having the same structure as the conventional device are arranged inside the iron core 30B in the same manner as in the conventional device. It has the same structure as the rotor 11 of the device. Further, as shown in FIG. 3C, the second rotor 11C has a plurality of conductor bars 32 arranged inside the iron core 30C along the surface of the iron core 30C and both ends of each conductor bar of the iron core 30C. Short-circuit rings 31A provided at both ends,
It is short-circuited by being connected to 31B and forms the rotor conductor of the well-known squirrel cage induction motor. That is, the first rotor 11B forming the rotor of the permanent magnet synchronous motor and the second rotor 11C forming the rotor of the squirrel cage induction motor are axially displaced from each other by a slight distance, and the same shaft is formed. It is fixed at 6. Connection to the power supply is made by the circuit shown in FIG. 2 as in the first embodiment.

Next, the operation of this embodiment will be described. In FIG. 2, since the changeover switch 35 is normally connected to the permanent magnet synchronous motor drive power supply device 34, when the power switch (not shown) of the refrigerant compression device is turned on, the changeover switch 35 is applied to the coil 13 of the stator of the electric motor unit 10. Electric power is supplied from the permanent magnet synchronous motor drive power supply device 34, and the first rotor 11B of the electric motor unit 10 is attracted and rotated by the rotating magnetic field of the coil 13 of the stator to rotate as in the conventional device described above, and the refrigerant compression device. Is driven. When the permanent magnet synchronous motor drive power supply device 34 fails for some reason and the power supply by this device becomes impossible, the changeover switch 35 is switched to the wiring 36 side to connect the electric motor unit 10 to the three-phase commercial AC power supply 33. To do. in this case,
The rotating magnetic field induced in the coil 13 of the stator by the electric power from the three-phase commercial AC power source 33 cannot give a driving force to the first rotor 11B, as in the first embodiment, but the rotating magnetic field of the stator 12 does. Intersects with the plurality of conductor bars 32 of the second rotor 11C, so that the conductor bars 3
A secondary current is induced in the closed circuit formed by 2 and the short-circuiting rings 31A and 31B, and the second rotor 11 is driven by the driving force generated by the secondary current and the rotating magnetic field of the stator 12.
C is started as an induction motor, and the refrigerant compression device can be operated.

[0017]

According to the refrigerant compression device of the present invention, in the refrigerant compression device having the compression mechanism portion housed in the closed container for compressing the refrigerant, and the electric motor portion driving the compression mechanism portion, the electric motor portion is A stator having a coil connected to an external power source, and a permanent magnet and a plurality of conductor bars and the conductors, which are arranged to face the stator and are coupled to the compression mechanism section through a shaft and provided inside the iron core. Since it is equipped with a rotor having a short-circuit ring that short-circuits the bar, it can be connected to a commercial AC power source even if the permanent magnet synchronous motor drive power supply device fails and cannot be driven as a permanent magnet synchronous motor. Since it can be driven as an induction motor, the reliability of the refrigerant compression device can be improved.

In the refrigerant compression device according to the present invention, the electric motor section is also provided with a stator having a coil connected to an external power source, and the stator is arranged so as to face the stator and is coupled to the compression mechanism section via a shaft. One rotor is equipped with a permanent magnet inside the iron core, the other rotor is equipped with multiple conductor bars inside the iron core, and a short-circuit ring that short-circuits the conductor bars at both ends of the iron core. Therefore, even if the permanent magnet synchronous motor drive power supply device fails and cannot be driven as a permanent magnet synchronous motor, it can be driven as an induction motor by connecting to a commercial AC power source. The reliability of the refrigerant compression device can be improved.

[Brief description of drawings]

1A and 1B show a rotor structure of an electric motor unit that constitutes a main part of a first embodiment of the present invention, in which FIG. 1A is a schematic view showing the external structure of the rotor, and FIG. It is a sectional view taken along the line A.

FIG. 2 is a circuit diagram showing an example of power supply to an electric motor unit.

3A and 3B show the configuration of the rotor of the electric motor unit that constitutes the main part of the second embodiment of the present invention. FIG. 3A is a schematic diagram showing the external configuration of the rotor, and FIG. -B is sectional drawing in a line, (c) is sectional drawing in CC line of (a).

FIG. 4 is a sectional view showing a configuration of a conventional scroll-type refrigerant compression device.

FIG. 5 is a cross-sectional view showing a configuration of a rotor of an electric motor section in a conventional refrigerant compression device.

[Explanation of symbols]

6 shaft, 10 electric motor part, 11 rotor, 11B first rotor, 11C second rotor, 18, 19 permanent magnet, 30 iron core,
31A, 31B short-circuit ring, 32 conductor bar,
33 commercial AC power supply, 34 permanent magnet synchronous motor drive power supply device, 35 changeover switch, 36 wiring.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 1/22 H02K 1/22 A 5H621 1/27 501 1/27 501A 5H622 16/02 16/02 17 / 16 17/16 A 21/14 21/14 M (72) Inventor Takashi Ishigaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. F term (reference) 3H003 AA05 AB03 AC03 CF04 3H029 AA02 AA14 AB03 BB41 BB51 CC07 CC27 CC51 CC61 CC62 3H039 AA03 AA12 BB21 CC11 CC32 CC39 5H002 AB07 AE08 5H013 MM06 5H621 AA03 BB02 BB10 GA01 HH01 HH10 5H622 CA02 CA07 CA09 CA13 CB06

Claims (6)

[Claims] 1. A refrigerant compression device having a compression mechanism portion housed in a closed container for compressing a refrigerant and an electric motor portion driving the compression mechanism portion, wherein the electric motor portion includes a coil connected to an external power source. A rotor having a stator, a permanent magnet provided inside the iron core and a plurality of conductor bars, and a short-circuit ring for short-circuiting the conductor bars, which is arranged to face the stator and is coupled to the compression mechanism through a shaft. A refrigerant compression device comprising: 2. A refrigerant compression device having a compression mechanism unit for compressing a refrigerant housed in a closed container and an electric motor unit for driving the compression mechanism unit, wherein the electric motor unit includes a coil connected to an external power source. The rotor includes a stator and two rotors that are arranged to face the stator and are coupled to the compression mechanism through a shaft. One rotor is provided with a permanent magnet inside the iron core, and the other rotor is provided in the other rotor. A refrigerant compression device comprising: a plurality of conductor bars provided inside an iron core; and short-circuit rings for short-circuiting the conductor bars at both ends of the iron core. 3. The permanent magnet, wherein the surface side of the iron core is an N pole,
The permanent magnet with the S pole on the shaft side and the S pole on the surface side of the iron core,
The refrigerant compression device according to claim 1 or 2, wherein the shaft side is composed of N-pole permanent magnets, and the permanent magnets are alternately arranged in the rotational direction. 4. The refrigerant compression device according to claim 1, wherein the plurality of conductor bars are provided on an outer peripheral side of the permanent magnet. 5. The compression mechanism section is a scroll compressor, and the compression mechanism section is any one of claims 1 to 4.
Refrigerant compression device according to item. 6. The motor unit according to claim 1, wherein the motor unit is switchably connectable to a permanent magnet synchronous motor drive power source device or a commercial AC power source by a change-over switch. The refrigerant compression device described.