JP6094717B1 - Compressor - Google Patents

Abstract

A compressor capable of suppressing a reduction in efficiency and generation of abnormal noise when a motor is driven is provided. A compressor includes a compression mechanism unit and a motor that drives the compression mechanism unit. The motor has a stator core (105) in which a plurality of core pieces are connected in an annular shape. The stator core (105) is a portion where a plurality of core pieces are connected in a region (S2) in which the magnetic flux density is lower than the average magnetic flux density of the entire stator core (105) when the pulsation of the motor load is peak. In addition, there is no place welded in the region (S1, S1) where the magnetic flux density is higher than the average magnetic flux density. [Selection] Figure 5

Description

  The present invention relates to a compressor.

  Conventionally, a compressor includes a compression mechanism section and a motor that drives the compression mechanism section, and the stator core of the motor folds a plurality of core pieces connected via the connection section into an annular shape, and abuts both ends. Some are formed (for example, refer to JP-A-2002-95193 (Patent Document 1)).

JP 2002-95193 A

  By the way, in the stator core of the said compressor, after connecting each connection part of a some core piece into the cyclic | annular form, the part of the joint of the both ends is finally welded.

  For this reason, in the above compressor, there is a problem that magnetic flux is hindered in the welded portion of the stator core, and there is a problem that noise is generated due to efficiency reduction or vibration when the motor is driven. In the compressor, if the location of the welded portion of the stator core is not appropriate, the problems of efficiency reduction and abnormal noise generation during motor driving become significant.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compressor that can suppress efficiency reduction and abnormal noise generation when driving a motor.

In order to solve the above problems, the compressor of the present invention is:
A compression mechanism,
A motor for driving the compression mechanism,
The motor has a stator core in which a plurality of core pieces are connected in an annular shape,
The stator core is at least one of the locations where the plurality of core pieces are connected in a region where the magnetic flux density is lower than the average magnetic flux density of the whole stator core when the load pulsation of the motor is at a peak. While having a welded portion welded, the structure is characterized in that there is no place welded in a region where the magnetic flux density is higher than the average magnetic flux density.

  Here, “the peak of the pulsation of the load of the motor” is the peak of the load of the motor at the rated output.

  According to the above configuration, in the stator core in which a plurality of core pieces are connected in a ring shape, the welding portion is provided in a region where the magnetic flux density is lower than the average magnetic flux density of the entire stator core when the pulsation of the load of the motor is at a peak. As a result, there is less influence on the magnetic flux in the welded portion of the stator core, but no welded portion is provided in the high magnetic flux density region of the stator core that has a large influence when there is a welded portion. Generation can be effectively suppressed.

In the compressor of one embodiment,
The stator core has the welded portion in a region where the magnetic flux density is lower than the average magnetic flux density when the load pulsation of the motor is at a peak and the torque ripple of the motor is at a peak.

  According to the above embodiment, in the stator core, by providing a weld in a region where the magnetic flux density is lower than the average magnetic flux density when the pulsation of the load of the motor is peak and the torque ripple of the motor is peak, The influence on the magnetic flux can be further reduced in the welded portion of the stator core.

In the compressor of one embodiment,
The number of the welded portions of the stator core is one.

  According to the said embodiment, by making the welding part of a stator core into one, while being able to reduce a welding process, the influence with respect to magnetic flux can be reduced more reliably.

In the compressor of one embodiment,
The peak of the pulsation of the load of the motor is one per rotation of the rotor of the motor.

  According to the above embodiment, since the peak of the pulsation of the load of the motor is one per rotation of the motor rotor, when the torque ripple of the motor is the peak and the pulsation of the motor load is the peak (or the motor When the torque ripple is the peak and the torque ripple peak is adjacent to the peak of the motor load pulsation), the pattern of the low magnetic flux density region and the high magnetic flux density region of the stator core is specified as one pattern. It is easy to provide a weld in the region where the magnetic flux density is low. That is, compared with the case where there are a plurality of pulsation peaks of the load of the motor per one rotation of the rotor, it is possible to easily set the location where the welded portion is provided.

  As is clear from the above, according to the present invention, when the torque ripple of the motor is peak and the pulsation of the motor load is peak (or the torque ripple of the motor is peak and the peak of the torque ripple is the pulsation of the motor load. Compression that suppresses efficiency reduction and abnormal noise when driving the motor by providing a weld in the region where the magnetic flux density of the stator core is low (when adjacent to the peak) and not providing a weld in the region where the magnetic flux density is high Machine can be realized.

FIG. 1 is a longitudinal sectional view of a compressor according to a first embodiment of the present invention. FIG. 2 is a plan view of a band-shaped stator core. FIG. 3 is a plan view of a stator core formed in an annular shape. FIG. 4 is a diagram showing the relationship between the magnetic flux distribution of the motor, the torque ripple, and the motor phase current. FIG. 5 is a diagram showing the magnetic flux distribution of the motor when the pulsation of the motor load is at a peak. FIG. 6 is a longitudinal sectional view of a compressor according to the second embodiment of the present invention. FIG. 7 is a plan view of a stator core and a rotor of the motor of the compressor. FIG. 8 is a diagram showing the relationship between the rotating machine angle of the motor and the torque of the motor shaft. FIG. 9 is a diagram showing the magnetic flux distribution of the stator core when the pulsation of the motor load is at a peak.

  Hereinafter, the compressor of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 shows a longitudinal sectional view of a compressor according to a first embodiment of the present invention.

  As shown in FIG. 1, the compressor according to the first embodiment includes a sealed container 1, a compression mechanism unit 2 disposed in the sealed container 1, and a compressor mechanism unit 2 disposed in the sealed container 1. And a motor 3 that is driven via a drive shaft 12. The compressor according to the first embodiment is a one-cylinder rotary compressor.

  In this compressor, a compression mechanism unit 2 is arranged on the lower side in the sealed container 1, and a motor 3 is arranged on the upper side of the compression mechanism unit 2. The compressor 6 is driven by the rotor 6 of the motor 3 via the drive shaft 12.

  The compression mechanism section 2 sucks refrigerant gas from the accumulator 10 through the suction pipe 11. The refrigerant gas is obtained by controlling a condenser, an expansion mechanism, and an evaporator (not shown) that constitute an air conditioner as an example of a refrigeration system together with the compressor.

  The compressor discharges compressed high-temperature and high-pressure refrigerant gas from the compression mechanism unit 2 to fill the inside of the sealed container 1 and cools the motor 3 through a gap between the stator 5 and the rotor 6 of the motor 3. After that, the discharge pipe 13 provided on the upper side of the motor 3 is discharged to the outside.

  An oil reservoir 9 in which lubricating oil is stored is formed in the lower portion of the high-pressure region in the closed container 1. The lubricating oil moves from the oil reservoir portion 9 to a sliding portion such as the compression mechanism portion 2 through an oil passage (not shown) provided in the drive shaft 12, and lubricates the sliding portion. .

  The compression mechanism 2 includes a cylinder 21 attached to the inner surface of the sealed container 1, an upper end plate member 50 (front head) and a lower end plate attached to the upper and lower open ends of the cylinder 21. Member 60 (rear head). A cylinder chamber 22 is formed by the cylinder 21, the upper end plate member 50, and the lower end plate member 60. The upper end plate member 50 is an example of a first head, and the lower end plate member 60 is an example of a second head.

  The upper end plate member 50 includes a disk-shaped main body 51 and a boss 52 provided upward in the center of the main body 51. The drive shaft 12 is inserted through the main body 51 and the boss 52.

  The main body 51 is provided with a discharge port 51 a that communicates with the cylinder chamber 22. A discharge valve 31 is attached to the main body 51 so as to be located on the opposite side of the main body 51 from the cylinder 21. The discharge valve 31 is a reed valve, for example, and opens and closes the discharge port 51a.

  A cup-shaped muffler cover 40 is attached to the main body 51 so as to cover the discharge valve 31 on the side opposite to the cylinder 21. The muffler cover 40 is fixed to the main body 51 by bolts 35 or the like. The muffler cover 40 has a boss portion 52 inserted therethrough.

  A muffler chamber 42 is formed by the muffler cover 40 and the upper end plate member 50. The muffler chamber 42 and the cylinder chamber 22 communicate with each other through a discharge port 51a.

  The muffler cover 40 has a hole 43 that communicates the muffler chamber 42 with the outside of the muffler cover 40.

  The lower end plate member 60 includes a disc-shaped main body portion 61 and a boss portion 62 provided downward in the center of the main body portion 61. The drive shaft 12 is inserted through the body portion 61 and the boss portion 62.

  Thus, one end of the drive shaft 12 is supported by the upper end plate member 50 and the lower end plate member 60. One end portion (support end side) of the drive shaft 12 enters the cylinder chamber 22.

  An eccentric shaft portion 26 is provided on the support end side of the drive shaft 12 so as to be positioned in the cylinder chamber 22 on the compression mechanism portion 2 side. The eccentric shaft portion 26 is fitted to the roller 27 of the piston 28. The piston 28 is disposed so as to be able to revolve in the cylinder chamber 22, and performs a compression action by the revolving motion of the piston 28.

  In other words, one end portion of the drive shaft 12 is supported by the housing 7 of the compression mechanism portion 2 on both sides of the eccentric shaft portion 26. The housing 7 includes an upper end plate member 50 and a lower end plate member 60.

  2 is a plan view of a strip-shaped stator plate 110 used for the stator core 105 of the stator 5, and FIG. 3 is a plan view of the annular stator plate 110 used for the stator core 105. The stator plate 110 is manufactured by punching a magnetic steel sheet having a thickness of about 0.2 mm to 0.5 mm.

  As shown in FIG. 2, the stator plate 110 has six core pieces 111 a to 111 f that are linearly expanded via a connecting portion 113. The core pieces 111a to 111f have teeth portions 112a to 112f.

  And as shown in FIG. 3, after laminating | stacking the stator plate 110 by which the core pieces 111a-111f were expand | deployed linearly, it deform | transforms cyclically | annularly and provides the welding part 114 by welding the attached edge part. ing. Thereby, the annular stator core 105 is formed. Here, in the first embodiment, laser welding, spot welding, or the like is used for welding the welded portion 114, but the welding method is not limited to this.

  Next, a coil (shown in FIG. 5) is wound around the teeth 105a of the stator core 105 deformed into an annular shape.

  In addition, after laminating | stacking the stator board 110 by which the core pieces 111a-111f shown in FIG. 2 were expand | deployed linearly, you may wind a coil (not shown) around the teeth 105a.

  In addition, the stator core of the motor that drives the compression mechanism of the present invention is not limited to the one in which the stator plates 110 shown in FIGS. 2 and 3 are stacked, and may be any one in which a plurality of core pieces are connected in an annular shape.

  FIG. 4 shows the relationship between the magnetic flux distribution of the motor 3, the torque ripple, and the motor phase current.

  4 shows the magnetic flux distribution of the rotor 6 and the stator 5 at the rotation positions (a) to (k), (m) every 30 degrees of the rotor 6 rotating counterclockwise.

  Further, on the lower side of the diagram showing the magnetic flux distribution of the rotor 6 and the stator 5, a graph showing a change in torque ripple of the motor 3 that periodically fluctuates at intervals of 30 degrees is shown.

  In addition, the pulsation of the motor load is indicated by a thick dotted line over the torque ripple. This pulsation of the motor load has one peak per rotation of the rotor 6. Here, the motor load is the compression mechanism unit 2 (shown in FIG. 1). Specifically, as the rotor 6 of the motor 3 (shown in FIG. 1) rotates, the piston 28 (shown in FIG. 1) in the compression mechanism 2 revolves through the drive shaft 12 (shown in FIG. 1). As the compression of the refrigerant proceeds, the motor load gradually increases. When the pressure in the cylinder chamber 22 exceeds a certain level, the discharge valve 31 (shown in FIG. 1) opens and high-pressure refrigerant is discharged from the cylinder chamber 22 to The pressure in the chamber 22 decreases and the motor load decreases.

  Further, on the lower side of FIG. 4, motor phase currents (three phases) flowing in the coil 120 (shown in FIG. 5) of the stator 5 are shown. The horizontal axis of the torque ripple and motor phase current graph represents the rotation angle [deg], and the vertical axis is an arbitrary scale.

  As shown in FIG. 4, when the rotation angle in the motor phase current is 180 deg, the torque ripple peak and the motor load peak overlap.

  For example, at the rotational position (a) of the rotor 6, when one of the three phases of the motor phase current is the maximum current, the torque generated on the N pole side of the rotor 6 increases, and on the S pole side of the rotor 6 The generated torque is reduced. Here, the magnetic flux density increases between the pole through which the maximum current of the stator 5 (shown in FIG. 1) flows and the pole adjacent to the pole, and the magnetic flux density between the other poles and the other poles decreases.

  Next, at the rotational position (b) of the rotor 6, when the other one of the three phases of the motor phase current is the maximum current, the torque generated on the S pole side of the rotor 6 increases and the N of the rotor 6 increases. The torque generated on the pole side is reduced. Similarly, the magnetic flux density increases between the pole through which the maximum current of the stator 5 flows and the pole adjacent to the pole, and the magnetic flux density between the other poles and the other poles decreases.

  FIG. 5 shows the magnetic flux distribution (rotational position (f) of the rotor 6) of the motor 3 when the torque ripple is peak and the pulsation of the motor load is peak. In FIG. 5, the boundaries of the core pieces 111 a to 111 f and the connecting portions 113 shown in FIG. 3 are omitted for easy understanding of the drawing. Reference numerals 106a to 106d denote magnets inserted in the rotor 6 at intervals in the axial direction.

  Here, the outside of the magnets 106a and 106c is the S pole, and the outside of the magnets 106b and 106d is the N pole. The motor 3 includes a four-pole rotor 6 and a three-phase six-throttle stator 5.

  Regions S1 and S1 shown in FIG. 5 are regions in which the magnetic flux density of the stator core 105 is maximized at the rotational position (f) of the rotor 6 being driven. On the other hand, the areas S2 and S2 shown in FIG. 5 are areas where the magnetic flux density of the stator core 105 is low.

  According to the compressor configured as described above, in the stator core 105 in which the plurality of core pieces 111a to 111f are connected in an annular shape, the magnetic flux density is lower than the average magnetic flux density of the entire stator core 105 when the pulsation of the motor load is at a peak. By providing the welded portion 114 in the region, the influence on the magnetic flux in the welded portion 114 of the stator core 105 is reduced.

  On the other hand, if a welded portion is provided in a region where the magnetic flux density is higher than the average magnetic flux density of the entire stator core 105, eddy currents are generated by alternating magnetic flux in the welded portion where the laminated steel plates are welded in the laminating direction. Be disturbed. On the other hand, in the first embodiment, no welded portion is provided in a region where the magnetic flux density is higher than the average magnetic flux density of the entire stator core 105. Therefore, efficiency reduction and abnormal noise are generated when the motor 3 is driven. It can be effectively suppressed.

  Further, in the stator core 105, by providing the weld 114 in a region where the magnetic flux density is lower than the average magnetic flux density when the load pulsation of the motor 3 is peak and the torque ripple of the motor 3 is peak, The influence on the magnetic flux can be further reduced in the welded portion 114 of the stator core 105.

  Further, by using one welded portion 114 of the stator core 105, the number of welding processes can be reduced, and the influence on the magnetic flux can be more reliably reduced.

  Further, since the peak of the pulsation of the motor load is one per rotation of the rotor 6 of the motor 3, the region of the stator core 105 formed when the pulsation of the motor load is peak and the magnetic flux density are low. The pattern of a high area | region is specified as one, and the welding part 114 can be easily provided in the area | region where the magnetic flux density at that time is low. That is, compared with the case where the number of peaks per rotation of the pulsation of the motor load is plural, it is possible to easily set the location where the weld 114 is provided.

  In the first embodiment, the weld 114 is provided in a region where the magnetic flux density is lower than the average magnetic flux density of the entire stator core 105 when the torque ripple of the motor 3 is peak and the pulsation of the motor load is peak. The weld 114 may be provided in a region where the magnetic flux density of the stator core 105 is low when the torque ripple of the motor 3 is peak and the peak of the torque ripple is adjacent to the peak of pulsation of the motor load. This case also has the same effect as the first embodiment.

  Here, “when the torque ripple of the motor 3 is the peak and the torque ripple is adjacent to the peak of the pulsation of the motor load” means that the torque ripple peaks of the motor 3 are adjacent to each other before and after the torque ripple. This is when there is a peak of the pulsation of the motor load inside the intermediate point.

[Second Embodiment]
FIG. 6 shows a longitudinal sectional view of a compressor according to the second embodiment of the present invention. The compressor of the second embodiment has the same configuration as the compressor of the first embodiment except for the motor 203, and the same reference numerals are assigned to the same components.

  As shown in FIG. 6, the motor 203 used in the compressor of the second embodiment includes an annular stator 205 and a cylindrical rotor 206 disposed on the inner periphery of the stator 205.

  FIG. 7 is a plan view of the stator core 305 and the rotor 206 of the motor 203 of the compressor. As shown in FIG. 7, the stator core 305 includes an annular back yoke 305a and a plurality of teeth 305b protruding radially inward on the inner peripheral side of the back yoke 305a. The motor 203 includes a cylindrical rotor 206 and eight magnets 206a inserted in the axial direction with a space between the rotor 206 and the rotor 206.

  Here, in the plurality of magnets 206a, magnets having S poles on the outside and magnets having N poles on the outside are alternately arranged in the circumferential direction. The motor 203 includes an 8-pole rotor 206 and a three-phase 12-throttle stator 205.

  In the same manner as the stator core 105 of the first embodiment, the stator core 305 forms an annular stator core 305 by annularly connecting a plurality of core pieces (not shown) (see FIGS. 2 and 3).

  First, an electromagnetic steel plate having a thickness of about 0.2 mm to 0.5 mm is punched to produce a strip-shaped stator plate in which 12 core pieces (not shown) are linearly developed through a connecting portion.

  And after laminating | stacking the stator plate by which the said core piece was expand | deployed linearly, it is deform | transformed cyclically | annularly and the welded part 314 is provided by welding the joined edge part. Thereby, the annular stator core 305 is formed. Here, laser welding, spot welding, or the like is used for welding the welded portion 314, but the welding method is not limited thereto.

  Next, a coil (not shown) is wound around the teeth 305a of the stator core 305 that has been deformed into an annular shape.

  FIG. 8 shows the relationship between the rotating machine angle [deg] of the motor 203 and the torque [arbitrary scale] of the motor shaft. As shown in FIG. 8, the torque of the motor shaft (corresponding to the motor load) increases from about 0 deg to about 180 deg and reaches a peak, and then decreases from the peak to about 360 deg. It is pulsating.

  FIG. 9 shows the magnetic flux distribution of the stator core 305 when the torque of the motor shaft (motor load) has a peak pulsation.

  A region S201 shown in FIG. 9 is a region where the magnetic flux density is higher than the average magnetic flux density of the entire stator core 305 when the pulsation of the load of the rotor 206 being driven is at a peak. On the other hand, a region S202 shown in FIG. 9 is a region where the magnetic flux density is lower than the average magnetic flux density of the entire stator core 305.

  Here, as shown in FIG. 7, the rotating magnetic angle of the stator 205 is such that the rotating machine angle is counterclockwise in the order of region A (150 deg to 170 deg), region B (170 deg to 190 deg), and region C (190 deg to 210 deg). Rotate. In this case, the welded portion 314 is provided in the region B where the magnetic flux density is lower than the average magnetic flux density of the entire stator core 305 when the pulsation of the torque of the motor shaft (motor load) is at a peak.

  According to the compressor configured as described above, in the stator core 305 in which a plurality of core pieces are connected in a ring shape, the magnetic flux density is within a region lower than the average magnetic flux density of the entire stator core 305 when the pulsation of the motor load is at a peak. By providing the welded portion 314, the influence on the magnetic flux in the welded portion 314 of the stator core 305 is reduced.

  On the other hand, if a welded portion is provided in a region where the magnetic flux density is higher than the average magnetic flux density of the entire stator core 305, eddy currents are generated by alternating magnetic flux in the welded portion where the laminated steel plates are welded in the laminating direction. Be disturbed. On the other hand, in this embodiment, since the welded portion is not provided in the region where the magnetic flux density is higher than the average magnetic flux density of the entire stator core 305, it is effective to reduce efficiency and generate abnormal noise when the motor 203 is driven. Can be suppressed.

  In addition, by using only one welded portion 314 of the stator core 305, the number of welding processes can be reduced, and the influence on the magnetic flux can be more reliably reduced.

  Further, since the peak of the pulsation of the motor load is one per rotation of the rotor 206 of the motor 203, the stator core 305 formed at the peak of the pulsation of the motor load has a low magnetic flux density region and a magnetic flux density. The pattern of a high area | region is specified as one, and the welding part 314 can be easily provided in the area | region where the magnetic flux density at that time is low. That is, compared with the case where the number of peaks per rotation of the pulsation of the motor load is plural, it is possible to easily set the location where the welded portion 314 is provided.

  In the first and second embodiments, the one-cylinder compressor has been described. However, the present invention may be applied to a two-cylinder compressor.

  In the first and second embodiments, the rotary compressor has been described. However, the present invention may be applied to a compressor in which a motor load pulsates, such as an oscillating compressor or a scroll compressor.

  Moreover, although the said 1st Embodiment demonstrated the compressor using the strip | belt-shaped stator board 110 by which the core pieces 111a-111f were connected via the connection part 113 except the welding part, the stator core is this. Not limited to this, a stator plate in which a plurality of core pieces are connected via a hinge or the like except for a welded portion may be used. The same applies to the second embodiment.

  In the first and second embodiments, the compressor including the permanent magnet embedded motor has been described. However, a motor having another configuration such as a reluctance motor may be used.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first and second embodiments described above, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content described in the said 1st, 2nd embodiment is good also as one Embodiment of this invention.

The compressor of the present invention is
A compression mechanism,
A motor for driving the compression mechanism,
The motor has a stator core in which a plurality of core pieces are connected in an annular shape,
When the torque ripple of the motor is at a peak, a region with a low magnetic flux density and a region with a high magnetic flux density are formed in the stator core,
In the stator core, the torque ripple of the motor is at a peak and the pulsation of the load of the motor is at a peak, and the magnetic flux density is low, or the torque ripple of the motor is at a peak and the torque ripple has a peak. In the region where the magnetic flux density is low when adjacent to the peak of the pulsation of the load of the motor, the magnetic flux has a welded portion where at least one of the portions where the plurality of core pieces are connected is welded. A feature is that there is no welded portion in a high density region.

  According to the above configuration, when the torque ripple of the motor is at the peak and the pulsation of the load of the motor is at the peak, the welding portion is provided in the region where the magnetic flux density of the stator core is low, or the torque ripple of the motor is at the peak. By providing a weld in the region where the magnetic flux density of the stator core is low when the ripple peak is adjacent to the peak of the pulsation of the load of the motor, there is less influence on the magnetic flux in the weld of the stator core, while there is a weld. Since the welded portion is not provided in the high magnetic flux density region of the stator core, the efficiency reduction and abnormal noise can be effectively suppressed when the motor is driven.

In the compressor of one embodiment,
The number of the welded portions of the stator core is one.

  According to the said embodiment, by making the welding part of a stator core into one, while being able to reduce a welding process, the influence with respect to magnetic flux can be reduced more reliably.

In the compressor of one embodiment,
The peak of the pulsation of the load of the motor is one per rotation of the rotor of the motor.

  According to the above embodiment, since the peak of the pulsation of the load of the motor is one per rotation of the motor rotor, when the torque ripple of the motor is the peak and the pulsation of the motor load is the peak (or the motor When the torque ripple is the peak and the torque ripple peak is adjacent to the peak of the motor load pulsation), the pattern of the low magnetic flux density region and the high magnetic flux density region of the stator core is specified as one pattern. It is easy to provide a weld in the region where the magnetic flux density is low. That is, compared with the case where there are a plurality of pulsation peaks of the load of the motor per one rotation of the rotor, it is possible to easily set the location where the welded portion is provided.

DESCRIPTION OF SYMBOLS 1 ... Sealed container 2 ... Compression mechanism part 3,203 ... Motor 5,205 ... Stator 6,206 ... Rotor 7 ... Housing 9 ... Oil reservoir part 10 ... Accumulator 11 ... Suction pipe 12 ... Drive shaft 13 ... Discharge pipe 21 ... Cylinder 22 ... Cylinder chamber 22a ... Suction chamber (low pressure chamber)
22b ... Discharge chamber (high pressure chamber)
25 ... Bush 26 ... Eccentric shaft part 27 ... Roller 28 ... Piston 31 ... Discharge valve 35 ... Bolt 40 ... Muffler cover 42 ... Muffler chamber 43 ... Hole 50 ... End plate member 51 ... Main body 51a ... Discharge port 52 ... Boss part 60 ... End plate member 61 ... Main body 62 ... Boss part 105, 305 ... Stator core 105a, 305b ... Teeth 110 ... Stator plate 111a-111f ... Multiple core pieces 112a-112f ... Teeth part 113 ... Connection part 114, 314 ... Welding Part 120 ... Coil

Claims (4)

Compression mechanism (2);
A motor (3, 203) for driving the compression mechanism (2),
The motor (3, 203) has a stator core (105, 305) in which a plurality of core pieces (111a to 111f) are connected in an annular shape,
In the region where the magnetic flux density is lower than the average magnetic flux density of the entire stator core (105,305) when the load pulsation of the motor (3,203) is at a peak, the stator core (105,305) While it has a welding part (114,314) where at least one place among the places where a plurality of core pieces (111a-111f) were connected was welded, it welded in the field where magnetic flux density is higher than the above-mentioned average magnetic flux density A compressor characterized in that there is no part that has been made. The compressor according to claim 1,
The stator core (105,305) has a magnetic flux density higher than the average magnetic flux density when the load pulsation of the motor (3,203) is at a peak and the torque ripple of the motor (3,203) is at a peak. A compressor having the welded portion (114, 314) in a low region. The compressor according to claim 1 or 2,
The compressor characterized in that the number of the welded portions (114, 314) of the stator core (105, 305) is one. In the compressor according to any one of claims 1 to 3,
The compressor is characterized in that the peak of the load pulsation of the motor (3, 203) is one per rotation of the rotor (6, 206) of the motor (3, 203).