JP5822595B2 - Hermetic electric compressor - Google Patents

Description

  The present invention relates to a hermetic electric compressor that compresses a fluid such as a refrigerant, and more particularly to a hermetic electric compressor designed to improve the efficiency of the electric motor.

  In response to recent demands for reducing power consumption of hermetic electric compressors, various permanent magnet synchronous motors are often used to improve the efficiency of drive motors. A permanent magnet synchronous motor used for such a hermetic electric compressor generally includes a rotor having a plurality of permanent magnets mounted therein, and a plurality of teeth in which laminated steel sheets are wound via insulating members. And a stator having a portion. When energization is performed on the winding applied to the stator, torque is generated by the magnetic field generated by the winding and the magnetic flux of the magnet (see, for example, Patent Document 1).

  Further, the number of windings of the permanent magnet synchronous motor used in the conventional hermetic electric compressor as described above is set so that the operating current is less than the allowable value of the power source at the maximum load at the maximum number of rotations. . In addition, in the stator of the permanent magnet synchronous motor used for the conventional hermetic electric compressor, each winding is connected so as to generate a rotating magnetic field. Moreover, the neutral point and the input line (U phase, V phase, W phase) are formed by connecting the end portions (neutral point side lead wire, power source side lead wire) of each winding. .

WO08 / 102439 (FIG. 1 etc.)

  Since the torque in the permanent magnet synchronous motor is generated by the magnetic field generated by the winding and the magnetic flux of the magnet, the number of windings connected in series in the low speed range is small in the specification with a large number of windings connected in series. Torque can be generated with a smaller current than the specification. Therefore, in a specification with a large number of windings connected in series in a low rotation speed range, an electric circuit including a controller can be operated efficiently.

  On the other hand, when the rotational speed increases, the induced voltage induced in the winding by the magnetic flux of the rotor increases. Therefore, although it is necessary to apply a voltage higher than the induced voltage, a separate circuit is required to apply a voltage higher than the power supply input voltage, which causes problems such as cost, manufacturing process, and increase in the number of parts. In view of this, a control method such as “field weakening control” is generally employed in the high rotational speed region, which enables operation by energizing the stator at the timing of weakening the rotor magnetic flux.

  However, at the time of “field weakening control”, in order to generate torque, it is necessary to flow a larger current, and the efficiency is lowered. That is, if the number of turns of the windings connected in series is increased to improve the efficiency in the low rotation speed region, the efficiency is lowered in the high rotation speed region. Further, since the current value is high, it is necessary to increase the capacity of the power source. That is, it has been difficult to improve the efficiency of both the low speed range and the high speed range without increasing the capacity and voltage of the power source.

  The present invention has been made to solve the above-described problems, and is intended to improve the efficiency of both the low speed range and the high speed range without increasing the capacity of the power source or increasing the voltage. An object of the present invention is to provide a sealed electric compressor.

A hermetic electric compressor according to the present invention includes a hermetic container, a fluid compression mechanism disposed in the hermetic container, and an electric motor that is disposed in the hermetic container and drives the fluid compression mechanism. The electric motor includes a stator core having a tooth portion, a plurality of windings wound around the same tooth portion, and a switching unit configured by a wide band gap semiconductor housed in the hermetic container. A switching unit having an element, wherein the switching unit is capable of switching a current flow to the plurality of windings according to the number of rotations of the rotor, and the plurality of windings are It is wound around the tooth part via an insulating member, and the switching part is attached to the insulating member .

A hermetic electric compressor according to the present invention includes a hermetic container, a fluid compression mechanism disposed in the hermetic container, and an electric motor that is disposed in the hermetic container and drives the fluid compression mechanism. The electric compressor is housed in the hermetic container, the stator core having a tooth portion, the first winding, the second winding, and the third winding wound around the same tooth portion. A switching unit having a switching element formed of a wide band gap semiconductor, and the switching unit is configured to change the first winding, the second winding, and the third according to the number of rotations of the rotor. It is possible to switch between connecting a winding in series or connecting the second winding and the third winding in parallel to the first winding, and the first winding, the second winding The winding and the third winding are wound around the tooth portion via an insulating member It is, the switching part that is mounted on the insulating member.

  According to the hermetic electric compressor according to the present invention, since the current flow to the windings can be switched according to the number of rotations of the rotor, the rotation speed can be reduced without increasing the capacity or voltage of the power source. It is possible to improve the efficiency in both the number range and the high speed range.

It is a schematic longitudinal cross-sectional view which shows an example of schematic structure of the hermetic type electric compressor which concerns on embodiment of this invention. It is the schematic for demonstrating the stator of the hermetic type electric compressor which concerns on embodiment of this invention. It is the schematic which shows the electrical connection example of the coil | winding of the stator of the hermetic type electric compressor which concerns on embodiment of this invention. It is the schematic which shows schematic structure of the coil | winding of the stator of the sealed electric compressor which concerns on embodiment of this invention. It is a graph which shows the relationship between the winding number of the coil | winding connected in series in the same torque, and operating current.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional view showing an example of a schematic configuration of a hermetic electric compressor (hereinafter referred to as a compressor 100) according to an embodiment of the present invention. The configuration and operation of the compressor 100 will be described with reference to FIG. The compressor 100 is a component of a refrigeration cycle apparatus such as a refrigerator, a freezer, a vending machine, an air conditioner, a refrigeration apparatus, or a water heater. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

  The compressor 100 sucks a fluid such as a refrigerant, compresses it, and discharges it as a high-temperature and high-pressure state. The compressor 100 includes a fluid compression mechanism 106 and a drive mechanism unit 107. The fluid compression mechanism 106 and the drive mechanism unit 107 are accommodated in the sealed container 102. The sealed container 102 is a pressure container. As shown in FIG. 1, the fluid compression mechanism 106 is disposed on the upper side of the sealed container 102, and the drive mechanism unit 107 is disposed on the lower side of the sealed container 102. The bottom of the hermetic container 102 serves as a sump 131 for storing the refrigerating machine oil 130. The closed container 102 is connected to a suction pipe 103 for sucking fluid and a discharge pipe 104 for discharging fluid.

  The fluid compression mechanism 106 has a function of compressing the fluid sucked from the suction pipe 103 and discharging it to the discharge space 105 in the sealed container 102. The fluid discharged into the discharge space 105 is discharged from the discharge pipe 104 to the outside of the compressor 100. The drive mechanism unit 107 serves to drive the orbiting scroll 116 that constitutes the fluid compression mechanism 106 so that the fluid compression mechanism 106 compresses the fluid. That is, the fluid compression mechanism 106 compresses the fluid when the drive mechanism unit 107 drives the orbiting scroll 116 via the main shaft 110.

  The fluid compression mechanism 106 is roughly composed of a swing scroll 116 and a fixed scroll 121. As shown in FIG. 1, the orbiting scroll 116 is arranged on the lower side, and the fixed scroll 121 is arranged on the upper side. The fixed scroll 121 is formed with a spiral body 122 that is a spiral projection protruding from one surface of the base plate. The swing scroll 116 is also formed with a spiral body 117 that is a spiral projection protruding from one surface of the base plate. The swing scroll 116 and the fixed scroll 121 are mounted in the hermetic container 102 with the spiral body 117 and the spiral body 122 meshing with each other. A compression chamber 108 whose volume changes relatively is formed between the spiral body 117 and the spiral body 122.

  The fixed scroll 121 is fixed to the frame 125 with a bolt or the like (not shown). At the center of the fixed scroll 121, a protruding port 124 for discharging the compressed and high pressure fluid is formed. Then, the compressed and high-pressure fluid is discharged to the discharge space 105 provided in the upper part of the fixed scroll 121.

  The orbiting scroll 116 performs a revolving orbiting motion without rotating about the fixed scroll 121. A hollow cylindrical oscillating scroll boss 118 is formed at a substantially central portion of the surface of the oscillating scroll 116 opposite to the surface on which the spiral body 117 is formed (hereinafter referred to as a thrust surface 119). An eccentric pin portion 111 provided at the upper end of a main shaft 110 to be described later is fitted (engaged) with the swing scroll boss portion 118.

  The drive mechanism unit 107 includes a permanent magnet inside, a rotor 129 fixed to the main shaft 110, a stator 109 housed in the hermetic container 102 and held firmly, and a main shaft 110 that is a rotating shaft. Yes. The rotor 129 generates torque when the energization of the stator 109 is started, and rotates the main shaft 110. Further, the outer peripheral surface of the stator 109 is fixedly supported on the sealed container 102 by shrink fitting or the like. The rotor 129 is rotatably disposed on the inner peripheral surface side of the stator 109. That is, the rotor 129 and the stator 109 constitute a motor (electric motor). The stator 109 will be described in detail later.

  The main shaft 110 rotates with the rotation of the rotor 129 to turn the swing scroll 116. An upper end portion of the main shaft 110 is formed with an eccentric pin portion 111 that is rotatably fitted to the swing scroll boss portion 118 of the swing scroll 116. The refrigerating machine oil 130 accumulated in the sump 131 is sucked up along with the rotation of the main shaft 110, flows through the oil supply passage 114 formed in the main shaft 110, and is supplied to the fluid compression mechanism 106. .

  The upper part of the main shaft 110 is rotatably supported by a main bearing provided in the through hole of the frame 125, and the lower part of the main shaft 110 is rotatable by a sub bearing provided in the through hole of the sub frame 128. It is supported.

  The frame 125 is fixed to the inner peripheral surface of the sealed container 102, and a through hole through which the main shaft 110 is inserted is formed at the center. The through-hole is provided with a main bearing that rotatably supports the main shaft 110. Further, an oil drain hole 126 penetrating from the thrust surface 119 side of the orbiting scroll 116 to the axially lower side is formed in the frame 125 so that the refrigerating machine oil 130 that lubricates the thrust surface 119 is returned to the sump 131. Good. The frame 125 may be fixed to the inner peripheral surface of the closed container 102 by shrink fitting or welding.

  The subframe 128 has an outer peripheral surface fixed to the inner peripheral surface of the sealed container 102 by shrink fitting, welding, or the like, and a through-hole through which the main shaft 110 is inserted is formed at the center. The through-hole is provided with a sub-bearing for rotatably supporting the main shaft 110. The subframe 128 is installed below the sealed container 102 and supports the lower part of the main shaft 110.

  An Oldham ring 127 is disposed between the orbiting scroll 116 and the fixed scroll 121 to prevent the rotation of the orbiting scroll 116 during the eccentric orbiting motion. The Oldham ring 127 is disposed between the orbiting scroll 116 and the fixed scroll 121, and serves to prevent the orbiting scroll 116 from rotating and to enable a revolving orbiting movement. That is, the Oldham ring 127 functions as a rotation prevention mechanism for the orbiting scroll 116.

Here, the operation of the compressor 100 will be briefly described.
The rotor 129 constituting the electric motor rotates by torque generated by receiving a rotational force from a rotating magnetic field generated by the stator 109. Along with this, the main shaft 110 fixed to the rotor 129 is rotationally driven. The orbiting scroll 116 is engaged with the eccentric pin portion 111 of the main shaft 110, and the rotating rotation motion of the orbiting scroll 116 is converted into the revolution turning motion by the rotation preventing mechanism of the Oldham ring 127. By rotating the main shaft 110, the fluid in the sealed container 102 flows into the compression chamber 108 formed by the spiral body 122 of the fixed scroll 121 and the spiral body 117 of the swing scroll 116, and the suction process is started.

  When the fluid is sucked into the compression chamber 108, the revolving orbiting motion of the orbiting scroll 116 eccentric with respect to the main shaft 110 shifts to a compression process for reducing the volume of the compression chamber 108. That is, in the fluid compression mechanism 106, when the orbiting scroll 116 revolves and revolves, fluid is taken in from the outermost peripheral openings of the swirl body 117 of the orbiting scroll 116 and the spiral body 122 of the fixed scroll 121, which serve as suction ports. As the rocking scroll 116 rotates, it gradually goes to the center while being compressed. The fluid flows from the suction pipe 103 into the sealed container 102. Then, the fluid compressed in the compression chamber 108 moves to the discharge process. The fluid passes through the protruding port 124 of the fixed scroll 121, passes through the discharge space 105, and is discharged to the outside of the compressor 100.

  FIG. 2 is a schematic diagram for explaining the stator 109 of the compressor 100. Based on FIG. 2, a method of connecting the winding 140 to the stator 109 will be described. FIG. 2 shows one of a plurality of stator cores 150 having, for example, a substantially T-shape, constituting the stator core. Each of the teeth 150a of the plurality of stator cores 150 is provided with a winding 140, and the stator 109 is configured by combining them in an annular shape. In FIG. 2, a split core type stator 109 configured by combining a plurality of stator cores 150 in an annular shape is illustrated as an example, but the present invention is not limited to this.

  On the inner peripheral side of the stator core 150, a tooth portion 150a around which the winding is concentrated is formed so as to protrude. In a state where the plurality of stator cores 150 are annularly combined, a predetermined gap is formed between adjacent tooth portions 150a. As shown in FIG. 2, each stator core 150 is provided with an insulator 151, which is an example of an insulating member, on the upper and lower surfaces thereof, and the winding 140 is concentratedly wound around the tooth portion 150 a via the insulator 151. The stator core 150 may be configured by laminating a plurality of steel plates. In addition, a switching unit 143 is installed on the top of the insulator 151. This switching unit 143 switches the way of current flow to the windings concentrated on the same tooth portion 150a according to a predetermined condition.

  The winding concentratedly wound on the same tooth portion 150a includes the first winding 140 on the power supply side, the second winding 141 in the middle, and the third winding 142 on the neutral point side. One terminal side of the first winding 140 is referred to as a power supply side lead wire 140a, and the other terminal side is referred to as a non-power supply side lead wire 140b. One terminal side of the second winding 141 is referred to as a power supply side lead wire 141a, and the other terminal side is referred to as an anti-power supply side lead wire 141b. One terminal side of the third winding 142 is referred to as a power supply side lead wire 142a, and the other terminal side is referred to as a neutral point side lead wire 142b.

  Then, the power supply side lead wire 141b of the first winding 140 and the power supply side lead wire 141a of the second winding 141, and the power supply side lead wire 141b of the second winding 141 and the power supply side of the third winding 142 are provided. The lead wire 142 a is connected by the switching unit 143. In addition, the other end of the neutral point connection line 145 whose one end is connected to the neutral point side lead wire 142b of the third winding 142 is connected to the switching unit 143. That is, the switching unit 143 includes an anti-power-side lead wire 140b of the first winding 140, a power-side lead wire 141a of the second winding 141, an anti-power-side lead wire 141b of the second winding 141, The power supply side lead wire 142a of the three windings 142 and the neutral point connection wire 145 are connected. Note that one end of the neutral point side lead wire 142 b and the neutral point connection line 145 is connected via the control terminal 152.

  FIG. 2 shows an example in which a control line 146 to which an external signal is input is connected to the switching unit 143. That is, the switching unit 143 can switch the current flow through the windings by a signal output from a control device (not shown) such as a microcomputer and input via the control line 146. However, if the switching unit 143 can include a control device, the control line 146 is not necessary. In this case, it is preferable that the power supply side lead wire 140a of the first winding 140 also functions as a power line, and the switching unit 143 is made operable by a power source input via the power supply side lead wire 140a.

  The switching unit 143 has a switching element that switches the flow of current to the windings concentrated and wound around the same tooth portion 150a. The switching unit 143 is molded with a resin product or the like and is installed on the insulator 151. However, the installation position of the switching unit 143 is not limited to the upper part of the insulator 151. When the switching unit 143 is installed on the top of the insulator 151, a recess or the like is formed on the top surface of the insulator 151, and the switching unit 143 is accommodated in the formed recess.

  Switching unit 143 includes a switching element formed of a wide band gap semiconductor element such as a silicon carbide (SiC) element, a gallium nitride (GaN) element, or a diamond element. A wide band gap semiconductor is a general term for semiconductor elements having a large band gap compared to silicon (Si) elements, and has a feature that the heat resistant temperature is high (about 400 ° C.) and operation at a high temperature is possible. .

  In addition, since the switching unit 143 uses a wide band gap element that can operate at a high temperature with little loss, the switching unit 143 can be downsized, and can be attached to the stator 109 and can be stored in the sealed container 102. Can be improved. Furthermore, since the switching part 143 can be reduced in size, the disturbance of the fluid inside the sealed container 102 during the operation of the compressor 100 can also be suppressed. In addition, since a wide band gap element is used for the switching unit 143, it can be applied to a case where the inside of the sealed container 102 is in a high-temperature discharge gas atmosphere.

  When the voltage applied to the first winding 140 is equal to or lower than a predetermined value, the switching unit 143 connects all of the first winding 140 to the third winding 142 in series. On the other hand, when the voltage applied to the first winding 140 exceeds a predetermined value, the switching unit 143 includes the first winding 140, the second winding 141, the neutral point connection line 145, and the first winding. 140 and the third winding 142 are connected. That is, in this case, the switching unit 143 switches the connection state so that the second winding 141 and the third winding 142 are in parallel with the first winding 140.

  Note that whether or not the applied voltage is equal to or lower than a predetermined value may be determined based on the number of rotations of the rotor 129. Specifically, a control device (not shown) connected to the compressor 100 commands the rotational speed of the rotor 129 to obtain a necessary output, and the applied voltage is a predetermined value according to the rotational speed. It is also possible to determine whether or not: Further, when the applied voltage is equal to or lower than a predetermined value, it is referred to as a “low rotational speed range”, and when the applied voltage exceeds a predetermined value, it is referred to as a “high rotational speed range”. For example, the control device may determine whether the applied voltage is equal to or lower than a predetermined value according to the commanded set rotational speed, or may determine whether the commanded rotational speed is equal to or lower than the predetermined value. .

  FIG. 3 is a schematic diagram illustrating an example of electrical connection of the windings of the stator 109 of the compressor 100. FIG. 4 is a schematic diagram illustrating a schematic configuration of the windings of the stator 109 of the compressor 100. Based on FIG.3 and FIG.4, the switching of the flow of the electric current to the coil | winding by the switch part 143 which is the characteristic part of this Embodiment is demonstrated. FIG. 3 shows a case where the windings are Y-connected, only the U-phase electrical connection is shown in detail, and the V-phase and W-phase electrical connections are not shown. Further, as described above, the winding of the stator 109 of the compressor 100 has a three-part configuration of the first winding 140, the second winding 141, and the third winding 142. Furthermore, in FIG. 3, the case where the parallel number of each phase is 3 is shown as an example.

  As shown in FIGS. 3 and 4, the switching unit 143 is connected to the connection portion a to which the non-power supply side lead wire 140 b of the first winding 140 is connected and the power supply side lead wire 141 a of the second winding 141. A connecting portion b, a connecting portion c to which the non-power supply side lead wire 141b of the second winding 141 is connected, a connecting portion d to which the power supply side lead wire 142a of the third winding 142 is connected, and a neutral point It has at least a connection part e to which the connection line 145 is connected and a connection part X to which the control line 146 is connected. Then, the switching unit 143 switches the current flow to the winding depending on whether it is the “low rotation speed range” or the “high rotation speed range”.

  As described above, the switching unit 143 connects all of the first winding 140 to the third winding 142 in series when in the “low speed range”. That is, the switching unit 143 connects the connection unit a and the connection unit b, and the connection unit c and the connection unit d, respectively. By doing so, the first winding 140, the second winding 141, and the third winding 142 are connected in series. The current flowing from the power supply side lead wire 140 a of the first winding 140 flows through the first winding 140 and reaches the connection portion a of the switching unit 143. This current flows through the second winding 141 via the connection b of the switching unit 143 and reaches the connection c of the switching unit 143. This current flows through the third winding 142 via the connection part d of the switching part 143 and reaches the neutral point.

  On the other hand, the switching unit 143 connects the second winding 141 and the third winding 142 in parallel when in the “high rotation speed range”. That is, the switching unit 143 connects the connection part a and the connection part b, the connection part a and the connection part d, and the connection part c and the connection part e, respectively. In this way, the second winding 141 and the third winding 142 are connected in parallel. The current flowing from the power supply side lead wire 140 a of the first winding 140 flows through the first winding 140 and reaches the connection portion a of the switching unit 143. This current flows through the second winding 141 and the third winding 142 via the connection part b and the connection part d of the switching part 143. The current flowing through the second winding 141 reaches the connection part c of the switching part 143. This current reaches the neutral point via the connection part e of the switching part 143. The current flowing through the third winding 142 reaches the neutral point.

  In FIGS. 3 and 4, the case where the number of divisions of the winding is 3 is illustrated as an example, but the present invention is not limited to this, and the number of divisions of the winding may be two or more. As the number of winding divisions increases, finer current reduction control can be realized. 3 and 4 show an example in which the number of parallel phases is 3, but the present invention is not limited to this. However, the number of parallel phases is also affected by the number of poles of the motor, so there is little difference in effect. Further, in both the “low rotation speed range” and the “high rotation speed range”, the portion not involved in the connection of the switching unit 143 is insulated.

  FIG. 5 is a graph showing the relationship between the number of windings connected in series at the same torque and the operating current. Based on FIG. 5, the relationship between the number of windings connected in series at the same torque and the operating current will be described, and the operation of the switching unit 143 will be described. In FIG. 5, the horizontal axis represents the rotational speed and the vertical axis represents the operating current. FIG. 5 shows the relationship between the number of turns of the winding and the operating current when the winding is divided into three as shown in FIG. In FIG. 3, T1 is a specification with a small number of windings connected in series, that is, a pattern in which the second winding 141 and the third winding 142 are connected in parallel, and T2 is connected in series. The specifications have a large number of windings, that is, patterns in which the first winding 140, the second winding 141, and the third winding 142 are connected in series.

  Since the torque in the permanent magnet synchronous motor is generated by the magnetic field generated by the winding and the magnetic flux of the magnet, as shown in FIG. 5, in the specification having a large number of windings connected in series (T2 shown in FIG. 5), “low rotation” Torque can be generated with a smaller current than the specification (T1 shown in FIG. 5) in which the number of windings connected in series in the “several range” is small. Therefore, in the “low rotation speed range”, in a specification in which the number of windings connected in series is large, the electric circuit including the controller can be operated with high efficiency.

  Therefore, in the compressor 100, when the “low speed range” is set, the switching unit 143 connects all of the first winding 140, the second winding 141, and the third winding 142 in series. In the case of the low rotation speed range, the first winding 140, the second winding 141, and the third winding 142 are connected in series by the switching unit 143, so the number of windings in the same tooth portion is the first winding. 140 to the sum of the number of turns of the third winding 142. In this way, in the “low rotation speed range”, all of the first winding 140 to the third winding 142 are connected in series by the switching unit 143. Therefore, the winding wound around the same tooth portion and connected in series. Is the sum of the number of turns of the first winding 140 to the number of turns of the third winding 142, so that the generated torque can be increased and the operating current can be reduced.

  On the other hand, when the rotational speed increases, the induced voltage induced in the winding by the magnetic flux of the rotor increases. Therefore, in the “high rotation speed range”, a control method such as “weakening field control” is generally employed that enables operation by energizing the stator at the timing of weakening the rotor magnetic flux. However, at the time of “field weakening control”, it is necessary to flow a larger current in order to generate torque, and the efficiency is lowered (dashed arrow A shown in FIG. 5). Further, since the current value is high, it is necessary to increase the capacity of the power source. Therefore, in the “high rotation speed range”, if the number of turns of the windings connected in series is small, high-efficiency operation can be performed without causing an increase in capacity and voltage of the power source.

  Therefore, in the compressor 100, when the “high speed range” is set, the switching unit 143 connects the second winding 141 and the third winding 142 in parallel. In the high rotation speed range, the second winding 141 and the third winding 142 are connected in parallel by the switching unit 143. Therefore, the number of windings of the same tooth portion connected in series is the same as that of the first winding 140. This is the sum of the number of turns of the second winding 141 or the sum of the number of turns of the first winding 140 and the third winding 142. In this way, in the “high rotation speed range”, the second winding 141 and the third winding 142 are connected in parallel by the switching unit 143, so that the windings are wound around the same tooth and connected in series. Is the sum of the number of turns of the first winding 140 and the number of turns of the second winding 141, or the sum of the number of turns of the first winding 140 and the number of turns of the third winding 142. The voltage can be reduced and the operating current can be reduced (solid arrow B shown in FIG. 5).

  As described above, according to the compressor 100, the winding of each phase is divided into a plurality of parts, and the current flow to the winding is switched by the voltage applied to the first winding 140. And the efficiency of the electric motor can be greatly improved both in the “high rotation speed range”. Further, according to the compressor 100, since the switching unit 143 using the wide band gap element is provided, the size of the sealed container 102 can be reduced. Furthermore, according to the compressor 100, since it is not necessary to use a special power supply device, highly efficient operation is possible without increasing the size of the power supply device.

  If the control line 146 can be omitted, the arrangement part of the control line 146 can be omitted, and further downsizing of the sealed container 102 can be realized. Moreover, although the example which installed the switching part 143 in the insulator 151 was shown, insulating members, such as resin molded products other than the insulator 151, may be prepared, and you may make it install the switching part 143 in this insulating member.

  DESCRIPTION OF SYMBOLS 100 Sealed electric compressor (compressor), 102 Sealed container, 103 Intake pipe, 104 Discharge pipe, 105 Discharge space, 106 Fluid compression mechanism, 107 Drive mechanism part, 108 Compression chamber, 109 Stator, 110 Main shaft, 111 Eccentric pin , 114 oil supply flow path, 116 swing scroll, 117 spiral body, 118 swing scroll boss section, 119 thrust surface, 121 fixed scroll, 122 spiral body, 124 projecting port, 125 frame, 126 oil drain hole, 127 Oldham ring 128 Subframe, 129 Rotor, 130 Refrigerating machine oil, 131 Oil sump, 140 First winding, 140a Power supply side lead wire, 140b Anti power supply side lead wire, 141 Second winding, 141a Power supply side lead wire, 141b Anti power supply Side lead wire, 142 3rd winding, 142a Source side lead wire, 142b Neutral point side lead wire, 143 switching part, 145 neutral point connection line, 146 control line, 150 stator core, 150a tooth part, 151 insulator, 152 connection terminal, X connection part, a connection Part, b connecting part, c connecting part, d connecting part, e connecting part.

Claims (6)

A sealed container;
A fluid compression mechanism disposed in the sealed container;
A hermetic electric compressor provided with an electric motor disposed in the hermetic container and driving the fluid compression mechanism,
The motor is
A stator core having teeth,
A plurality of windings wound around the same tooth,
A switching unit that is housed in the hermetic container and has a switching element composed of a wide bandgap semiconductor,
The switching unit is
According to the rotation speed of the rotor, the current flow to the plurality of windings can be switched ,
The plurality of windings are
It is wound around the tooth part via an insulating member,
The switching unit is
A hermetic electric compressor, which is attached to the insulating member . The switching unit is
According to the number of rotations of the rotor, switching is performed between connecting all of the plurality of windings in series, or connecting or short-circuiting some of the plurality of windings in parallel. Item 2. The hermetic electric compressor according to Item 1. A sealed container;
A fluid compression mechanism disposed in the sealed container;
A hermetic electric compressor provided with an electric motor disposed in the hermetic container and driving the fluid compression mechanism,
The motor is
A stator core having teeth,
A first winding, a second winding, and a third winding wound around the same tooth portion;
A switching unit that is housed in the hermetic container and has a switching element composed of a wide bandgap semiconductor,
The switching unit is
Depending on the rotor speed,
Connecting the first winding, the second winding and the third winding in series, or connecting the second winding and the third winding in parallel to the first winding; Can be switched ,
The first winding, the second winding, and the third winding are:
It is wound around the tooth part via an insulating member,
The switching unit is
A hermetic electric compressor, which is attached to the insulating member . The switching unit is
The operation is controlled based on an external signal. The hermetic electric compressor according to any one of claims 1 to 3 . The plurality of windings are
It is wound around the tooth part via an insulating member,
The switching unit is
Hermetic electric compressor according to any one of claims 1 to 4, characterized in that mounted on the insulating member. The wide band gap semiconductor is
It is silicon carbide, a gallium nitride type material, or diamond. The hermetic electric compressor according to any one of claims 1 to 5 , wherein

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