WO2015045331A1

WO2015045331A1 - Permanent magnet electric motor, hermetic compressor, and refrigerating cycle device

Info

Publication number: WO2015045331A1
Application number: PCT/JP2014/004777
Authority: WO
Inventors: 一夫柴田
Original assignee: 東芝キヤリア株式会社
Priority date: 2013-09-27
Filing date: 2014-09-17
Publication date: 2015-04-02
Also published as: JP2015070652A

Abstract

[Problem] To provide, in a 6-pole 9-slot permanent magnet electric motor having a concentrated winding stator, a permanent magnet electric motor, the coil connection structure of which is simplified, a hermetic compressor, and refrigerating cycle device. [Solution] A permanent magnet electric motor has a 9-slot concentrated winding stator (14) having three coils (20) per phase. In the permanent magnet electric motor, the three coils (20) of each phase are continuously wound while alternately changing the winding direction, and in each phase, a jumper line (21) between the two coils (20) and a terminal wire (22) of the remaining coil (20) are connected to form a lead wire (23)-side end portion.

Description

Permanent magnet motor, hermetic compressor and refrigeration cycle apparatus

Embodiments of the present invention relate to a permanent magnet motor, a hermetic compressor using the permanent magnet motor, and a refrigeration cycle apparatus using the hermetic compressor.

Conventionally, as permanent magnet motors in which windings are wound around magnetic pole teeth of a stator core, those having various structures are known (see Patent Documents 1 and 2 below).

In such a permanent magnet motor, when the windings of each phase are connected in parallel, if the permanent magnet motor is a three-phase six-pole nine-slot type, six for each phase (U phase, V phase, W phase). A total of 18 terminal lines are generated.

And the connection of the three terminal wires to the lead wires of each phase is performed by soldering or welding.

In addition, when connecting the terminal line on the neutral point side, it is necessary to connect nine terminal lines when connecting to one place.

JP 2001-275291 A JP 2000-232745 A

However, when three terminal wires are connected to the lead wire of each phase, the number of terminal wires to be connected increases, which is troublesome.

And when these connections are made by soldering or welding, it is necessary to peel off the coating of the terminal wire, and the peeled piece of film enters the gap of the rotating part of the permanent magnet motor, thereby improving the performance of the permanent magnet motor. It may be damaged. Furthermore, it is necessary to take a measure of covering the soldered or welded connecting portion with an insulator and fixing it to somewhere. Moreover, the connection work by soldering or welding may impair the performance of the permanent magnet motor due to the work variation.

In addition, when connecting to a neutral point, it is necessary to connect nine terminal wires when connecting to one place, and welding or soldering is performed by peeling off the coating, which is a great deal in conjunction with the terminal wire routing process. Requires a lot of man-hours.

An object of the present invention is to provide a permanent magnet motor, a hermetic compressor, and a refrigeration cycle apparatus capable of simplifying a winding connection structure in a permanent magnet motor having a 9-slot concentrated winding stator. .

The permanent magnet motor according to the embodiment is a permanent magnet motor having a 9-slot concentrated winding stator having three windings for each phase, and the three windings for each phase are alternately changed in the winding direction. The connecting wire between the two windings and the terminal wire of the other winding are connected to each end of the lead wire side for each phase.

Further, the hermetic compressor includes the permanent magnet motor, a compression mechanism that compresses the working fluid by being connected to a rotation shaft of the permanent magnet motor, the permanent magnet motor, and the compression mechanism. And a hermetically sealed case that houses the container.

Further, the refrigeration cycle apparatus includes the hermetic compressor, a condenser connected to the hermetic compressor, an expansion device connected to the condenser, and between the expansion device and the hermetic compressor. And an evaporator connected to.

According to the present invention, it is possible to provide a permanent magnet motor, a hermetic compressor, and a refrigeration cycle apparatus that can simplify the connection structure of windings in a permanent magnet motor having a 9-slot concentrated winding stator.

It is a block diagram of the refrigerating-cycle apparatus containing the hermetic type compressor shown in the cross section in 1st Embodiment. It is a horizontal sectional view of a permanent magnet motor. It is a connection diagram which shows the connection state of the three-phase coil | winding of a permanent magnet motor. It is a front view which shows a press-contact terminal. It is a top view which shows the wiring state of the connecting wire connected using a press-contact terminal, and a terminal line. It is a front view which shows the connection state of the connecting wire and terminal wire by a press-contact terminal. It is a front view which shows the state in which the connecting wire and the terminal line were connected using the fusing terminal in 2nd Embodiment. It is a side view which shows the state in which the crossover and the terminal line were connected using the fusing terminal. It is explanatory drawing which shows the state in which the connecting wire, the terminal wire, and the lead wire were connected using the crimp terminal in 3rd Embodiment. It is a connection diagram which shows the connection state of the three-phase coil | winding of a permanent magnet motor in 4th Embodiment. It is a front view which shows a press-contact terminal. It is a top view which shows the wiring state of the three terminal wires connected using a press-contact terminal.

(First embodiment)
1st Embodiment is described based on FIG. 1 thru | or FIG. FIG. 1 shows a refrigeration cycle apparatus 1. The refrigeration cycle apparatus 1 includes a compressor body 2 and an accumulator 3, and includes a hermetic compressor 4 that compresses a gas refrigerant as a working fluid, and a compressor body. 2, a condenser 5 that condenses the high-pressure gas refrigerant discharged from the compressor body 2 to form a liquid refrigerant, an expansion device 6 that is connected to the condenser 5 to decompress the liquid refrigerant, and an expansion device 6. And an accumulator 3, and an evaporator 7 for evaporating the liquid refrigerant. The accumulator 3 and the compressor body 2 are connected by a suction pipe 8 through which a gas refrigerant flows.

The compressor body 2 has a sealed case 9 formed in a cylindrical shape, and a permanent magnet motor 10 positioned on the upper side and a compression mechanism unit 11 positioned on the lower side are accommodated in the sealed case 9. ing. The permanent magnet motor 10 is provided with a rotating shaft 12 having a center line along the vertical direction, and a compression mechanism 11 is connected to the rotating shaft 12.

The permanent magnet motor 10 is a part that drives the compression mechanism unit 11, and a concentrated winding that is fixed to the inner surface of the sealing case 9 and is disposed at a position surrounding the rotor 13. And a stator 14.

The compression mechanism unit 11 is a part that compresses the gas refrigerant, and has a compression element (not shown) that compresses the gas refrigerant sucked through the suction pipe 8. This compression element is a cylinder having a cylinder chamber into which a gas refrigerant flows, a roller that is fitted in an eccentric portion of the rotary shaft 12 and rotates eccentrically in the cylinder chamber, and a tip portion that is slidable by contacting the outer peripheral surface of the roller. Is provided with a blade that divides the cylinder chamber into a gas refrigerant suction chamber and a compression chamber. The gas refrigerant compressed to a high pressure in the compression mechanism unit 11 is discharged into the sealed case 9.

FIG. 2 is a horizontal sectional view showing the permanent magnet motor 10. This permanent magnet motor 10 is of a three-phase six-pole nine-slot type, and has a rotor 13 and a concentrated winding stator 14 disposed on the outer periphery of the rotor 13.

The rotor 13 has a rotor core 15 formed in a cylindrical shape by laminating thin steel plates, and the rotor core 15 is fixed to the rotating shaft 12. In the rotor core 15, six plate-like permanent magnets 16 are installed at equal intervals along the circumferential direction of the rotor core 15.

The concentrated winding stator 14 has a stator core 17 formed in a cylindrical shape by laminating thin steel plates, and the stator core 17 has nine slots along the circumferential direction of the stator core 17. 18 are formed at equal intervals, and magnetic pole teeth 19 projecting in the inner peripheral direction are formed at portions between adjacent slots 18. A winding 20 is wound around each magnetic pole tooth 19. The winding 20 is continuously wound with three windings 20 alternately changing the winding direction for every three phases (U phase, V phase, W phase).

That is, in the U phase, the three windings 20U1, 20U2, and 20U3 are continuously wound, and the winding direction of the winding 20U2 is opposite (left-handed) to the winding direction of the winding 20U1 (for example, right-handed). Furthermore, the winding direction of the winding 20U3 is reversed (right-handed) with respect to the winding direction (left-handed) of the winding 20U2.

In the V phase, three windings 20 of 20V1, 20V2, and 20V3 are continuously wound, and the winding direction of the winding 20V2 is reversed (left-handed) with respect to the winding direction of the winding 20V1 (for example, right-handed). Further, the winding direction of the winding 20V3 is reversed (right-handed) with respect to the winding direction (left-handed) of the winding 20V2.

In the W phase, three windings 20 of 20W1, 20W2, and 20W3 are continuously wound, and the winding direction of the winding 20W2 is reversed (left-handed) with respect to the winding direction of the winding 20W1 (eg, right-handed). Further, the winding direction of the winding 20W3 is reversed (right-handed) with respect to the winding direction (left-handed) of the winding 20W2.

Here, regarding the winding 20, the connecting wire, the terminal wire, the lead wire, and the lead wire, which will be described later, when explaining the relationship with each phase, the reference numerals U, V, and W representing each phase are attached. As will be described, if it is not necessary to explain the relationship with each phase, U, V, and W symbols are omitted as necessary.

FIG. 3 is a connection diagram showing a connection state of the three-phase winding 20. On the power supply side, the connecting wire 21U between the two U-phase windings 20U1 and 20U2 and the terminal wire 22U of the winding 20U3 are connected to form an end on the lead wire 23U side.

Similarly, also in the V phase, the connecting wire 21V between the two V-phase windings 20V1 and 20V2 and the terminal wire 22V of the winding 20V3 are connected to form an end on the lead wire 23V side. . Similarly, also in the W phase, the connecting wire 21W between the two windings W1, W2 of the W phase and the terminal wire 22W of the winding 20W3 are connected to form an end on the lead wire 23W side. .

On the neutral point side, the lead wire 25U connected to the connecting wire 24U between the two U-phase windings 20U2 and 20U3, the terminal wire 26U of the U-phase winding 20U1, and the two V-phase wires 25V connected to the connecting wire 24V between the windings 20V2 and 20V3, the terminal wire 26V of the V-phase winding 20V1, and the connecting wire between the two W-phase windings 20W2 and 20W3 The lead wire 25W connected to 24W and the terminal wire 26W of the W-phase winding 20W1 are connected.

FIG. 4 shows a pressure contact terminal 27 used when connecting the connecting wire 21 and the terminal wire 22 (the connecting wire 21U and the

terminal wire

22U, 21V and 22V, 21W and 22W). The pressure contact terminal 27 includes three pressure contact protrusions 28, two pressure contact slots 29 that are located between adjacent pressure contact protrusions 28 and cut into a U shape, and lead wires 23 ( 23U, 23V, and 23W) are formed.

FIG. 5 is a plan view showing a wiring state of the connecting wire 21 and the terminal wire 22 connected using the press contact terminal 27. A winding receiver 32 is fixed to the end face side of the stator core 17, and a holding portion 33 for holding the jumper wire 21 and the terminal wire 22 and a pressing contact projection 28 of the press contact terminal 27 are provided on the winding receiver 32. An insertion portion 34 to be inserted is formed.

FIG. 6 shows a connection state between the connecting wire 21 and the terminal wire 22 by the press contact terminal 27. The pressure contact protrusion 28 of the pressure contact terminal 27 is inserted into the insertion portion 34 of the winding receiver 32, and the crossover wire 21 and the terminal wire 22 held by the holding portion 33 are press-fitted into the pressure contact slot 29. Furthermore, a lead wire 23 is connected to the tab 30.

A blade portion is formed on the peripheral edge of the pressure contact slot 29, and the coating of the crossover wire 21 and the terminal wire 22 is broken by the blade portion when the crossover wire 21 and the terminal wire 22 are press-fitted into the pressure contact slot 29. The crossover wire 21 and the terminal wire 22 are electrically connected via the press contact terminal 27.

In such a configuration, in the hermetic compressor 4, when the permanent magnet motor 10 is energized, the rotary shaft 12 rotates around the center line, and the rotation of the rotary shaft 12 drives the compression mechanism unit 11, The gas refrigerant is compressed in the compression mechanism 11.

The compressed gas refrigerant is discharged from the compression mechanism 11 into the sealed case 9, and the high-pressure gas refrigerant discharged into the sealed case 9 passes again through the condenser 5, the expansion device 6, and the evaporator 7 in order. A refrigeration cycle is performed by circulating to the compression mechanism 11.

Here, in the case where the winding 20 of the three-phase permanent magnet motor 10 is connected to the lead wire 23 on the energization side, the connecting wire 21 (21U) and one of the two windings 20 (for example, 20U1 and 20U2). Since the terminal wire 22 (22U) of the winding 20 (20U3) is connected to the lead wire 23 (23U), the number of wires connected to the lead wire 23 is reduced, and the connection work is facilitated. .

In addition, since the connection between the crossover wire 21 and the terminal wire 22 is performed using the pressure contact terminal 27 having two pressure contact slots 29, it is not necessary to peel off the film of the crossover wire 21 and the terminal wire 22, and the connection is made. Work can be done without much effort.

In addition, there is no occurrence of a film piece due to peeling of the film, and the generated film piece does not enter the gap in the rotating portion of the permanent magnet electric motor 10 and impair the performance of the permanent magnet electric motor 10.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. Note that, in each of the embodiments after the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

The basic configuration of the second embodiment is the same as that of the first embodiment. The second embodiment is different from the first embodiment in order to connect the crossover line 21 and the terminal line 22. The fusing terminal 41 is used instead of the press contact terminal 27.

As shown in FIGS. 7 and 8, the fusing terminal 41 is formed with a fusing portion 42 that sandwiches the connecting wire 21 and the terminal wire 22 to be connected, and a tab 30 for connecting the lead wire 23. ing.

In connecting the connecting wire 21 and the terminal wire 22 using the fusing terminal 41, the connecting wire 21 and the terminal wire 22 are arranged in parallel and sandwiched by the fusing portion 42, and the fusing portion 42 is pressurized. This is done by passing an electric current and welding the connecting wire 21, the terminal wire 22, and the fusing terminal 41.

The fusing terminal 41 may be provided in the routing path of the crossover wire 21 and can be attached to, for example, the outer flange of the insulator provided in the concentrated winding stator 14.

In the case of connecting the wiring using the fusing terminal 41 having such a configuration, if the number of wirings to be connected is three or more, poor connection is likely to occur due to pressure and current variations. However, in this embodiment, when connecting the winding 20 of the three-phase permanent magnet motor 10 to the lead wire 23 on the energization side, the connecting wire 21 of the two windings 20 and the terminal of the one winding 20 are used. Since the wires 22 are connected using the fusing terminals 41, the number of wirings connected using the fusing terminals 41 is two, and a highly reliable connection state can be obtained without causing poor welding. it can.

Further, in the connection using the fusing terminal 41, it is possible to connect without peeling off the film of the crossover wire 21 and the terminal wire 22, and the labor for removing the film is reduced.

(Third embodiment)
A third embodiment will be described with reference to FIG. The basic configuration of the third embodiment is the same as that of the first embodiment, and the difference between the third embodiment and the first embodiment is the connection structure between the jumper wire 21 and the terminal line 22. is there.

In the third embodiment, the connecting wire 21, the terminal wire 22, and the core wire of the lead wire 23 are arranged in parallel, and the connecting wire 21, the terminal wire 22, and the core wire of the lead wire 23 are connected to the crimp terminal 51. Are connected by crimping. For example, the connecting wire 21 and the terminal wire 22 are placed on the outer flange portion of the insulator 52 provided in the concentrated winding stator 14.

As shown in FIG. 9, the crimp terminal 51 is formed in a substantially V shape with one end side expanded, and a groove 53 is formed inside thereof. By positioning the connecting wire 21, the terminal wire 22 and the core wire of the lead wire 23 inside the crimp terminal 51 and caulking the expansion side, the coating of the connecting wire 21 and the terminal wire 22 is broken by the groove 53. The connecting wire 21, the terminal wire 22, and the core wire of the lead wire 23 are electrically connected.

When the winding 20 of the three-phase permanent magnet motor 10 having such a configuration is connected to the lead wire 23 on the energization side, the connecting wire 21 of the two windings 20 and the terminal wire 22 of the one winding 20 are connected. The core wire of the lead wire 23 may be crimped by the crimp terminal 51, and the number of wires to be crimped is reduced, so that a highly reliable connection state can be obtained.

Moreover, in the connection by the crimp terminal 51, the crossover 21, the terminal wire 22 and the core wire of the lead wire 23 can be connected at the same time, and the lead wire 23 is connected to the crossover wire 21 and the terminal wire 22 previously connected. It is no longer necessary to connect the devices later, and the number of steps of connection work can be reduced.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. The basic configuration of the fourth embodiment is the same as that of the first embodiment, and the difference between the fourth embodiment and the first embodiment is a connection structure on the neutral point side.

As shown in FIG. 10, the first neutral point 61 is formed by connecting at least two

crossover lines

24U, 24V, and 24W on the neutral point side, and the remaining

terminal lines

26U, 26V, and 26W are connected. Is connected to the second neutral point 62.

Connection of the connecting

wires

24U, 24V, 24W is performed using a crimp terminal 51 as shown in FIG.

FIG. 11 shows a connection pressure contact terminal 63 for connecting the

terminal lines

26U, 26V, and 26W. The connecting press contact terminal 63 is formed by connecting two press contact terminals 64 with a connecting portion 65. Each press contact terminal 64 is formed with two press contact slots 29 and three press contact projections 28, similarly to the press contact terminal 27 shown in FIG. 4.

FIG. 12 is a plan view showing a wiring state of the three

terminal lines

26U, 26V, and 26W connected by using the connecting pressure contact terminal 63. FIG. A winding receiver 66 is fixed to the end face side of the stator core 17, and a holding portion 67 for holding the three

terminal wires

26U, 26V, and 26W and a pressing contact projection 28 are inserted into the winding receiver 66. The insertion portion 68 is formed. When one terminal wire 26W is routed and wired so as to be held at two locations, and the pressure contact projection 28 is inserted into the insertion portion 68 of the winding receiver 66, the terminal wire 26W has two pressure contact slots. 29 is press-fitted.

In such a configuration, at the first neutral point 61 (see FIG. 10), since the two connecting wires 24 are connected using the crimp terminals 51, the number of wires to be crimped is reduced and the reliability is improved. A highly connected state can be obtained.

In the second neutral point 62, since one terminal line 26W is routed so as to be press-fitted into the press-contact slot 29 of each press-contact terminal 64, the connection press-contact terminal having four press-contact slots 29 is provided. Even if the three

terminal lines

26U, 26V, and 26W are connected using 63, a balanced connection state can be obtained. Moreover, when the terminal line 26W is press-fitted across the pressure contact slots 29 of the two pressure contact terminals 64, the terminal line 26W functions as a connection line for the two pressure contact terminals 64, and The cross-sectional area of the conductor can be supplemented.

Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 4 ... Sealed compressor, 5 ... Condenser, 6 ... Expansion device, 7 ... Evaporator, 9 ... Sealed case, 10 ... Permanent magnet motor, 11 ... Compression mechanism part, 14 ... Concentrated winding fixing Child, 20 ... Winding, 21 ... Crossover, 22 ... Terminal wire, 23 ... Lead wire, 24 ... Crossover, 26 ... Terminal wire, 27 ... Pressure contact terminal, 29 ... Pressure contact slot, 51 ... Crimp terminal, 61 ... 1st neutral point, 62 ... 2nd neutral point, 63 ... Connection pressure contact terminal, 64 ... Pressure contact terminal

Claims

In a permanent magnet motor having a 9-slot concentrated winding stator with 3 windings in each phase,
Three windings of each phase are wound continuously by alternately changing the winding direction,
A permanent magnet electric motor characterized in that a connecting wire between two windings and a terminal wire of another winding are connected to each lead wire side end for each phase.
2. The permanent magnet motor according to claim 1, wherein the connecting wire and the terminal wire are connected by a press contact terminal having two press contact slots into which the connecting wire and the terminal wire are press-fitted.
The permanent magnet motor according to claim 1, wherein the connecting wire, the terminal wire, and the lead wire core wire are arranged side by side, and each wire is connected by a crimp terminal.
In a permanent magnet motor having a 9-slot concentrated winding stator with 3 windings in each phase,
Three windings of each phase are wound continuously by alternately changing the winding direction,
The connecting wire between the two windings of each phase and the terminal wire of the other winding are connected to be the lead wire side end,
The remaining crossovers of each phase are connected at least two places to be the first neutral point,
A permanent magnet motor characterized in that three of the remaining terminal wires of each phase are connected to form a second neutral point.
The remaining three terminal wires of each phase are connected by a connected pressure contact terminal having a structure in which two pressure contact terminals having two pressure contact slots are connected, and one terminal wire is connected to two pressure contact terminals. The permanent magnet motor according to claim 4, wherein the permanent magnet motor is routed across the press contact slot.
The permanent magnet motor according to any one of claims 1 to 5,
A compression mechanism that compresses the working fluid by being coupled to and driven by the rotating shaft of the permanent magnet motor;
A sealed case that houses the permanent magnet motor and the compression mechanism;
A hermetic compressor comprising:
The hermetic compressor according to claim 6, a condenser connected to the hermetic compressor, an expansion device connected to the condenser, and an expansion device connected between the expansion device and the hermetic compressor. A refrigeration cycle apparatus comprising: an evaporator.