JP2010226830A - Electric motor and compressor equipped with the same - Google Patents

Abstract

An electric motor capable of improving performance and reliability and a compressor equipped with the electric motor are provided.
An electric motor comprising a stator 20 having a stator core mounted with a plurality of phases of stator windings, and a rotor 40 rotatably disposed on the inner peripheral surface of the stator core. The rotor 40 includes a plurality of magnet insertion holes 43 for mounting permanent magnets 44, a rotor core 41 having gaps 45 and 46 formed between adjacent magnet insertion holes 43, and magnet insertion holes 43. The rotor core 41 is configured by laminating electromagnetic steel plates 42a and 42b having different opening areas of the gaps 45 and 46.
[Selection] Figure 2

Description

  The present invention relates to an electric motor used for various industrial machines such as an air conditioner and a refrigeration apparatus, and a refrigerant compressor equipped with the electric motor.

  In recent years, electric motors used in various industrial machines are required to be highly efficient and resource-saving (smaller and lighter) from the viewpoints of energy saving and environmental protection. As one of the realization methods, a permanent magnet type electric motor in which a magnet is inserted into a rotor has been proposed (for example, see Patent Document 1). An electric motor described in Patent Document 1 includes a stator configured by mounting a plurality of phases of stator windings on a stator core, and a substantially plate-like permanent magnet in a form orthogonal to the radial direction inside the rotor core. Is a permanent magnet type electric motor provided with a rotor that is configured to be rotatably mounted inside the stator core of the stator. The rotor core of this electric motor is configured by laminating electromagnetic steel plates such as silicon steel plates. Then, in each end portion of the permanent magnet in the rotor core, a gap is formed that extends to the vicinity of the outer surface of the rotor core, and the thickness (bridge portion) between the inner surface of the rotor and the outer surface of the rotor core is formed. The dimension is set to decrease from the permanent magnet end side toward the adjacent permanent magnet side. The gaps formed at the ends of these permanent magnets have the same size in all the electromagnetic steel sheets constituting the rotor.

JP 2000-217287 A (page 6, FIG. 1)

  The electric motor described in Patent Document 1 forms a gap that extends to the vicinity of the outer surface of the rotor core at each end of the permanent magnet in the rotor core to prevent a short circuit of the magnetic field between the ends of the adjacent permanent magnets. is doing. As a result, the amount of magnetic flux interlinking the stator windings is increased to improve the performance of the electric motor. However, in order to withstand the centrifugal force of the rotating permanent magnet and the rotor core itself, a gap is formed so that the thickness dimension of the bridge portion decreases from the end of the permanent magnet toward the adjacent permanent magnet. Yes. For this reason, the thickness dimension of a bridge part becomes thick in the permanent magnet part side, and the short circuit prevention effect of a magnetic field has faded. On the other hand, if the bridge portion is thinned, the mechanical strength cannot be maintained, and fatigue damage of the bridge portion is caused. Therefore, it is necessary to limit the number of rotation speed fluctuations and the maximum rotation speed, and the reliability is lowered.

  In general, an electromagnetic steel plate such as a silicon steel plate constituting the rotor core is formed by punching with a press die. It is generally known that the fatigue strength of this electrical steel sheet is affected by the state of the punched shear section and the residual stress due to the strain at the time of punching. In consideration of such manufacturing variation factors, it is necessary to set the size of the gap (the thickness of the bridge portion), and as a result, the gap becomes smaller (the bridge portion becomes thicker). For this reason, the short-circuit prevention effect of the magnetic field at the bridge portion is diminished.

  As described above, the performance and reliability of the electric motor are affected by the shape of the gap formed in the rotor core. However, it is difficult to improve the performance and reliability of the conventional motor in which the size of the gap is the same for all the electromagnetic steel sheets from the viewpoint of the processing accuracy of the gap formed in the electromagnetic steel sheets. There was a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric motor capable of improving performance and reliability and a compressor equipped with the electric motor.

  An electric motor according to the present invention includes a stator having a stator core with a plurality of phases of stator windings mounted thereon, and a rotor rotatably disposed on the inner peripheral surface side of the stator core. The rotor is inserted into the magnet insertion hole and a rotor core having a plurality of magnet insertion holes for mounting permanent magnets and a gap formed between the adjacent magnet insertion holes. A rotor magnet, and the rotor core is formed by laminating a plurality of types of electromagnetic steel sheets having different opening areas of the gaps.

  Moreover, the compressor which concerns on this invention uses said electric motor.

  In the present invention, the opening formed in the gap formed between the adjacent magnet insertion holes differs depending on the electromagnetic steel sheet constituting the rotor core. For this reason, the magnetic steel sheet in which the gap portion having a large opening area is formed (compared to the gap portion having a small opening area described later) suppresses a short circuit of the magnetic field between the ends of the adjacent permanent magnets, and thus the stator. The amount of magnetic flux interlinking the windings can be increased, and the performance of the motor can be improved. In addition, the electromagnetic steel sheet in which the gap portion having a smaller opening area than the gap portion having the larger opening area described above can maintain mechanical strength and improve the reliability of the electric motor. Therefore, it is possible to obtain an electric motor capable of improving performance and reliability and a compressor equipped with the electric motor.

It is a longitudinal cross-sectional schematic diagram which shows an example of the refrigerant compressor 100 by which the electric motor which concerns on Embodiment 1 of this invention is mounted. FIG. 3 is an explanatory diagram for explaining a rotor constituting the electric motor according to the first embodiment. 3 is an enlarged view of a main part showing an electromagnetic steel sheet 42 according to Embodiment 1. FIG. It is a principal part enlarged view which shows the electromagnetic steel plate 42 which concerns on Embodiment 2. FIG. It is a principal part enlarged view which shows the electromagnetic steel plate 42 which concerns on Embodiment 3. FIG. It is a principal part enlarged view which shows the electromagnetic steel plate 42 which concerns on Embodiment 4. FIG. FIG. 10 is an enlarged view of a main part showing an electromagnetic steel sheet 42 according to a fifth embodiment.

  In the following embodiment, an example in which the electric motor according to the present invention is used in a refrigerant compressor will be described.

Embodiment 1 FIG.
FIG. 1 is a schematic longitudinal sectional view showing an example of a refrigerant compressor 100 on which the electric motor according to Embodiment 1 of the present invention is mounted. Based on this FIG. 1, the structure and operation | movement of the refrigerant compressor 100 are demonstrated. The refrigerant compressor 100 is shown as an example of a scroll compressor. For example, the refrigerant compressor 100 is a component of a refrigeration cycle (heat pump cycle) such as a refrigerator, a freezer, a vending machine, an air conditioner, a refrigeration apparatus, or a water heater. It will be. 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 refrigerant compressor 100 sucks the refrigerant circulating in the refrigeration cycle, compresses it, and discharges it as a high-temperature and high-pressure state. The refrigerant compressor 100 can be classified into a compression unit 16 and a drive unit 17. The compression unit 16 and the drive unit 17 are accommodated in a sealed container (shell) 10. The sealed container 10 is a pressure container. As shown in FIG. 1, the compression unit 16 is disposed on the upper side of the sealed container 10, and the driving unit 17 is disposed on the lower side of the sealed container 10. The bottom of the hermetic container 10 is a sump 11 for storing the refrigerating machine oil 1. In addition, the closed container 10 is connected to a suction side pipe 12 for sucking refrigerant gas and a discharge side pipe 13 for discharging refrigerant gas.

  The compression unit 16 has a function of compressing the refrigerant gas sucked from the suction side pipe 12 and discharging it to the discharge space 15 in the sealed container 10. The refrigerant gas discharged into the discharge space 15 is discharged from the discharge side pipe 13 to the outside of the refrigerant compressor 100. The drive unit 17 serves to drive the orbiting scroll 24 constituting the compression unit 16 in order to compress the refrigerant gas by the compression unit 16. That is, when the drive unit 17 drives the orbiting scroll 24 via the crankshaft 21, the compression unit 16 compresses the refrigerant gas.

  The compression unit 16 is roughly configured by a turning scroll 24, a fixed scroll 28, and a frame 31. As shown in FIG. 1, the orbiting scroll 24 is arranged on the lower side, and the fixed scroll 28 is arranged on the upper side. The fixed scroll 28 is formed with a lap portion 29 which is a spiral projection standing on one surface. Further, the orbiting scroll 24 is also provided with a wrap portion 25 that is a spiral protrusion that is erected on one surface and has substantially the same shape as the wrap portion 29. The orbiting scroll 24 and the fixed scroll 28 are mounted in the sealed container 10 with the lap portion 25 and the lap portion 29 meshing with each other. And between the lap | wrap part 25 and the lap | wrap part 29, the compression chamber 18 from which a volume changes relatively is formed.

  The fixed scroll 28 is fixed to the frame 31 with a bolt or the like (not shown). A discharge port 30 for discharging the compressed and high-pressure refrigerant gas is formed at the center of the fixed scroll 28. The compressed and high pressure refrigerant gas is discharged into the discharge space 15 provided in the upper part of the fixed scroll 28. The orbiting scroll 24 performs a revolving orbiting movement without rotating about the fixed scroll 28. A hollow cylindrical orbiting scroll boss portion 26 is formed at a substantially central portion of a surface (hereinafter referred to as a thrust surface) opposite to the surface on which the orbiting scroll 24 forms the lap portion 25. An eccentric pin portion 22 provided at the upper end of a crankshaft 21 to be described later is fitted (engaged) with the orbiting scroll boss portion 26.

  The frame 31 is fixed to the inner peripheral surface of the sealed container 10, and a through hole is formed in the center portion for allowing the crankshaft 21 to pass therethrough. Further, the frame 31 is formed with an oil drain hole 32 penetrating from the thrust surface 27 side of the orbiting scroll 24 to the lower side in the axial direction so that the refrigerating machine oil 1 that lubricates the thrust surface 27 is returned to the sump 11. It has become. Although FIG. 1 shows an example in which only one oil drain hole 32 is formed, the present invention is not limited to this. For example, two or more oil drain holes 32 may be formed. Note that the outer peripheral surface of the frame 31 may be fixed to the inner peripheral surface of the sealed container 10 by shrink fitting, welding, or the like.

  The drive unit 17 includes a rotor 40 fixed to the crankshaft 21, a stator 20 housed in the hermetically sealed container 10 and fixedly held, and a crankshaft 21 that is a rotating shaft. The rotor 40 is fixed to the crankshaft 21 and is driven to rotate when the energization of the stator 20 starts to rotate the crankshaft 21. Further, the outer peripheral surface of the stator 20 is fixedly supported by the sealed container 10 by shrink fitting or the like. That is, the rotor 40 and the stator 20 constitute an electric motor (motor). The electric motor will be described in detail below.

  The stator 20 is configured by mounting a plurality of phases of stator windings (not shown) on a stator core (not shown). The crankshaft 21 rotates with the rotation of the rotor 40 to rotate the orbiting scroll 24. At the upper end portion of the crankshaft 21, an eccentric pin portion 22 that is rotatably fitted to the orbiting scroll boss portion 26 of the orbiting scroll 24 is formed. Further, an oil supply passage 23 communicating with the upper end surface is formed inside the crankshaft 21. The oil supply passage 23 becomes a passage for the refrigerating machine oil 1 stored in the sump 11. The refrigerating machine oil 1 accumulated in the sump 11 sucks up the refrigerating machine oil 1 as the crankshaft 21 rotates, flows through the oil supply passage 23 and is supplied to the compression unit 16.

  An Oldham ring 33 is disposed between the orbiting scroll 24 and the fixed scroll 28 to prevent the rotation of the orbiting scroll 24 during the eccentric orbiting movement. The Oldham ring 33 is disposed between the orbiting scroll 24 and the fixed scroll 28 and serves to prevent the orbiting scroll 24 from rotating and to enable a revolving orbiting movement. That is, the Oldham ring 33 functions as a rotation prevention mechanism for the orbiting scroll 24.

Here, the operation of the refrigerant compressor 100 will be briefly described.
The rotor 40 constituting the electric motor rotates by receiving a rotational force from a rotating magnetic field generated by the stator 20. Accordingly, the crankshaft 21 fixed to the rotor 40 is driven to rotate. The orbiting scroll 24 is engaged with the eccentric pin portion 22 of the crankshaft 21, and the rotating rotation motion of the orbiting scroll 24 is converted into the revolution orbiting motion by the rotation preventing mechanism of the Oldham ring 33. As the crankshaft 21 rotates, the refrigerant gas in the hermetic container 10 flows into the compression chamber 18 formed by the lap portion 29 of the fixed scroll 28 and the lap portion 25 of the orbiting scroll 24, and the suction process starts.

  When the refrigerant gas is sucked into the compression chamber 18, the revolving orbiting motion of the eccentric orbiting scroll 24 shifts to a compression process for reducing the volume of the compression chamber 18. That is, in the compression unit 16, when the orbiting scroll 24 makes a revolving orbiting motion, the refrigerant gas is taken in from the outermost peripheral openings of the wrap portion 25 of the orbiting scroll 24 and the lap portion 29 of the fixed scroll 28, which serve as suction ports, and the orbiting scroll. It goes toward the center while being gradually compressed with the rotation of 24. The low-pressure refrigerant that has circulated through the refrigeration cycle flows into the sealed container 10 from the suction side pipe 12.

  Then, the refrigerant gas compressed in the compression chamber 18 moves to the discharge process. That is, the refrigerant gas passes through the discharge port 30 of the fixed scroll 28 and is discharged to the outside of the refrigerant compressor 100 after passing through the discharge space 15. The refrigerant discharged from the discharge side pipe 13 of the refrigerant compressor 100 is in a high-temperature and high-pressure state, and first flows into the condenser constituting the refrigeration cycle. It circulates and is sucked into the refrigerant compressor 100 again. Then, when the energization to the stator 20 is stopped, the refrigerant compressor 100 stops.

  FIG. 2 is an explanatory diagram for explaining the rotor 40 constituting the electric motor according to Embodiment 1 of the present invention. Here, FIG. 2A shows a plan view of the rotor 40, and FIG. 2B shows a side sectional view of the rotor 40. The rotor 40 will be described in detail based on FIG. Further, as described above, the rotor 40 is fixed to the crankshaft 21 and constitutes an electric motor (permanent magnet type electric motor) together with the stator 20 and the crankshaft 21. The rotor 40 is rotatably arranged on the inner peripheral surface side of the stator core constituting the stator 20.

  As shown in FIG. 2B, the rotor 40 includes a rotor core 41 in which a plurality of electromagnetic steel plates 42 such as silicon steel plates are stacked, and a magnet insertion hole in which the rotor core 41 is penetrated in the axial direction. And a permanent magnet 44 attached to 43. The rotor core 41 is formed with a rotation shaft insertion hole 50 and a magnet insertion hole 43 penetratingly formed. The rotation shaft insertion hole 50 is formed at the center of the rotor core 41, and the magnet insertion hole 43 is formed so as to surround the rotation shaft insertion hole 50. The rotary shaft insertion hole 50 is configured in a substantially circular shape, and the magnet insertion hole 43 is configured in a substantially rectangular shape.

  In FIG. 2A, four magnet insertion holes 43 are formed every 90 °. The formation position of the magnet insertion hole 43 is determined according to the number of the magnet insertion holes 43. For example, when four magnet insertion holes 43 are formed as shown in FIG. 2 (a), a radial axis is determined every 90 ° by dividing 360 ° by 4, and the axis is opposed to the axis. The position may be determined as the magnet insertion hole 43. Further, when three magnet insertion holes 43 are formed, a radial axis is determined every 120 ° obtained by dividing 360 ° by 3 and the position on the axis may be determined as the magnet insertion hole 43.

  A plate-like permanent magnet 44 is attached to each of the magnet insertion holes 43. These permanent magnets 44 are mounted so that N poles and S poles are alternated. In addition, at each end of the magnet insertion hole 43, gaps 45 and 46 are formed extending to the vicinity of the outer peripheral surface of the rotor core 41 and penetrating in the axial direction. That is, the gaps 45 and 46 formed at each end of the magnet insertion hole 43 are formed by penetrating the rotor core 41 in the axial direction so as to go to the outer peripheral surface of the rotor core 41. Therefore, bridge portions 47 and 48 having a uniform width are formed between the gap portions 45 and 46 and the outer peripheral surface of the rotor core 41. Here, the gaps 45 and 46 correspond to the gaps of the present invention.

  The bridge portions 47 and 48 serve as a flow path for a magnetic field generated from the permanent magnet 44 of the rotor 40 that houses the permanent magnet 44. Therefore, in order to improve the performance of the electric motor, it is preferable that the bridge portions 47 and 48 are thin. That is, the gaps 45 and 46 are preferably larger. On the other hand, since the centrifugal force of the permanent magnet 44 and the rotor core 41 itself generated by rotating acts on the bridge portions 47 and 48, the mechanical strength decreases if the bridge portions 47 and 48 are made too thin. That is, if the gaps 45 and 46 are too large, the reliability of the electric motor is lowered. In particular, in an electric motor that is subjected to speed change control, since repeated stress acts on the bridge portions 47 and 48, it is important to ensure mechanical strength. However, the conventional motor in which the size of the gaps 45 and 46 is the same in all the electromagnetic steel sheets 42 is the same as that of the motor in terms of the processing accuracy of the gaps 45 and 46 formed in the electromagnetic steel sheets 42. It was difficult to improve both reliability and reliability.

  Therefore, in the first embodiment, the rotor core 41 is configured by laminating two types of electromagnetic steel plates 42a and 42b having different opening areas of the air gaps 45 and 46, whereby both the performance and reliability of the electric motor are achieved. We are trying to improve.

  FIG. 3 is an enlarged view of a main part showing the electromagnetic steel sheet 42 according to Embodiment 1 of the present invention. Here, FIG. 3A is an enlarged view of a main part showing the electromagnetic steel sheet 42a in which the gaps 45a and 46a having a small opening area are formed. FIG. 3B is an enlarged view of the main part showing the electromagnetic steel sheet 42b in which the gaps 45b and 46b having a large opening area are formed. FIG. 3A and FIG. 3B show the position of the Q portion shown in FIG. In each of FIG. 3A and FIG. 3B, for comparison, the gap portions 45b and 46b and the gap portions 45a and 46a are indicated by imaginary lines. In the following description, when it is necessary to clarify the difference in the opening area of the gap, an alphabetic code is attached to the end. If it is not necessary to clarify the difference in the opening area of the gap, the explanation will be made without adding an alphabetic code at the end.

  As shown in FIG. 3A and FIG. 3B, the widths of the bridge portions 47a and 48a formed between the gap portions 45a and 46a and the outer peripheral surface of the electromagnetic steel plate 42a are the same as the gap portions 45b and 46b. The width of the bridge portions 47b and 48b formed between the electromagnetic steel plate 42b and the outer peripheral surface is larger. In the first embodiment, the width of the bridge portions 47b and 48b is, for example, about 0.2 mm. As a result, the magnetic steel sheet 42b in which the gaps 45b and 46b having a large opening area are formed suppresses the short circuit of the magnetic field between the ends of the adjacent permanent magnets 44, thereby reducing the amount of magnetic flux interlinking the stator windings. It is possible to increase the performance of the electric motor. Further, the electromagnetic steel sheet 42a in which the gaps 45a and 46a having a small opening area are formed makes it possible to maintain the mechanical strength and improve the reliability of the electric motor. Then, by laminating these electromagnetic steel plates 42a and 42b to constitute the rotor core 41, both the performance and reliability of the electric motor are improved.

  For example, in the first embodiment, as shown in FIG. 2B, an electromagnetic steel plate 42a having a high mechanical strength is laminated on the upper and lower sides, and an electromagnetic steel plate 42b having a high magnetic field short-circuit suppressing effect is laminated on the center portion. Thus, the rotor core 41 is configured. The permanent magnet 44 may vibrate in the magnet insertion hole 43 when the rotational speed of the motor is changed, when the motor is driven, when the motor is stopped, or the like. At this time, the reliability (mechanical strength) of the electric motor can be effectively improved by disposing the electromagnetic steel plate 42a having high mechanical strength above and below the magnet insertion hole 43 where the permanent magnet 44 is easy to contact. it can.

  In the rotor 40 configured as described above, the magnetic steel sheet 42b in which the gaps 45b and 46b having a large opening area are formed suppresses the short circuit of the magnetic field between the ends of the adjacent permanent magnets 44, and the stator. The amount of magnetic flux interlinking the windings can be increased, and the performance of the motor can be improved. Further, the electromagnetic steel sheet 42a in which the gaps 45a and 46a having a small opening area are formed makes it possible to maintain the mechanical strength and improve the reliability of the electric motor. And by laminating | stacking these electromagnetic steel plates 42a and 42b and comprising the rotor core 41, both the performance and reliability of an electric motor can be improved.

  Further, by arranging the electromagnetic steel plate 42a having high mechanical strength at the upper and lower portions of the magnet insertion hole 43 where the permanent magnet 44 is easy to contact, the reliability (mechanical strength) of the electric motor can be effectively improved. .

In addition, the lamination | stacking method of the electromagnetic steel plates 42a and 42b which concerns on this Embodiment 1 is an example. For example, the rotor iron core 41 may be configured by laminating the electromagnetic steel plates 42a and the electromagnetic steel plates 42b every predetermined number. At this time, the predetermined number may be arbitrarily changed at the axial position of the rotor core 41.
In addition, the rotor core 41 is configured by two types of electromagnetic steel plates 42a and 42b having different opening areas of the gap portions 45 and 46. Thus, the rotor core 41 may be configured.

Embodiment 2. FIG.
It is possible to implement the present invention other than the shape of the gaps 45 and 46 shown in the first embodiment. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.

  FIG. 4 is an enlarged view of a main part showing the electromagnetic steel sheet 42 according to Embodiment 2 of the present invention. Here, Fig.4 (a) is a principal part enlarged view which shows the electromagnetic steel plate 42a in which the space | gap part with a small opening area was formed. Moreover, FIG.3 (b) is a principal part enlarged view which shows the electromagnetic steel plate 42b in which the space | gap part with a large opening area was formed. 4 (a) and 4 (b) show the position of the Q portion shown in FIG. 2 (a). In each of FIG. 4A and FIG. 4B, for comparison, the gap portion of the electromagnetic steel plate 42b and the gap portion of the electromagnetic steel plate 42a are indicated by imaginary lines.

  As shown in FIGS. 4 (a) and 4 (b), gaps 45, 46 extending near the outer peripheral surface of the rotor core 41 and penetrating in the axial direction are provided at each end of the magnet insertion hole 43. Forming. In addition, each of the gaps 45 and 46 extends in the direction of the center of the permanent magnet 44 so that the outer peripheral side end of the electromagnetic steel plate 42 is along the outer peripheral surface of the electromagnetic steel plate 42. As a result, bridge portions 47 and 48 having a uniform width are formed between the gap portions 45 and 46 and the outer peripheral surface of the electromagnetic steel plate 42.

  Here, as shown in FIGS. 4A and 4B, the lengths of the bridge portions 47a and 48a formed between the gap portions 45a and 46a and the outer peripheral surface of the electromagnetic steel plate 42a are the gap portions. It is shorter than the length of the bridge parts 47b and 48b formed between 45b and 46b and the outer peripheral surface of the electromagnetic steel plate 42b. In the magnetic steel sheet 42b in which the gaps 45b and 46b having a large opening area are formed, the lengths of the bridge portions 47b and 48b serving as magnetic field flow paths are long, so that the magnetic field is short-circuited between the ends of the adjacent permanent magnets 44. It is possible to increase the amount of magnetic flux interlinking the stator windings while suppressing the above, and to improve the performance of the electric motor. In addition, the magnetic steel sheet 42a in which the gaps 45a and 46a having a small opening area are formed has a short length of the bridge portions 47a and 48a, so that the mechanical strength can be maintained and the reliability of the motor can be improved. . Then, by laminating these electromagnetic steel plates 42a and 42b to constitute the rotor core 41, both the performance and reliability of the electric motor are improved.

  In the rotor 40 configured as described above, both the performance and reliability of the electric motor can be improved as in the first embodiment.

  In the second embodiment, both the performance and reliability of the electric motor are improved by making the lengths of the bridge portions 47 and 58 different. However, both the length and the width of the bridge portions 47 and 58 are made different. Thus, both the performance and reliability of the electric motor may be improved.

Embodiment 3 FIG.
Further, the present invention can be carried out even when the gap is formed as follows. In Embodiment 3, items that are not particularly described are the same as those in Embodiment 1 or Embodiment 2, and the same functions and configurations are described using the same reference numerals.

  FIG. 5 is an enlarged view of a main part showing the electromagnetic steel sheet 42 according to Embodiment 3 of the present invention. Here, Fig.5 (a) is a principal part enlarged view which shows the electromagnetic steel plate 42a in which the space | gap part with a small opening area was formed. FIG. 5B is an enlarged view of a main part showing the electromagnetic steel sheet 42b in which a gap having a large opening area is formed. FIG. 5A and FIG. 5B show the position of the Q portion shown in FIG. In each of FIGS. 5 (a) and 5 (b), for comparison, the gap portion of the electromagnetic steel plate 42b and the gap portion of the electromagnetic steel plate 42a are indicated by imaginary lines.

  As shown in FIGS. 5 (a) and 5 (b), gaps 45, 46 extending near the outer peripheral surface of the rotor core 41 and penetrating in the axial direction are provided at the respective ends of the magnet insertion holes 43. Forming. In addition, each of the gaps 45 and 46 extends in the direction of the center of the permanent magnet 44 so that the outer peripheral side end of the electromagnetic steel plate 42 is along the outer peripheral surface of the electromagnetic steel plate 42.

  Here, as shown in FIG. 5B, a substantially triangular gap 49 is formed between adjacent permanent magnets 44 in the electromagnetic steel sheet 42b. That is, the size of the opening area of the gap formed between the adjacent permanent magnets 44 is larger than that of the electromagnetic steel sheet 42a by the gap 49. As a result, the magnetic steel sheet 42b in which the gap portion having a large opening area is formed has a small amount of steel plate material serving as a magnetic field flow path between the adjacent permanent magnets 44. Therefore, the magnetic field between the end portions of the adjacent permanent magnets 44 is reduced. It is possible to improve the performance of the electric motor by suppressing the short circuit and increasing the magnetic flux amount interlinking the stator windings. In addition, the magnetic steel sheet 42a in which the gap portion having a small opening area is formed includes a large amount of steel sheet material between the adjacent permanent magnets 44. Therefore, it is possible to maintain the mechanical strength and improve the reliability of the electric motor. . Then, by laminating these electromagnetic steel plates 42a and 42b to constitute the rotor core 41, both the performance and reliability of the electric motor are improved.

  Also in the rotor 40 configured as described above, both the performance and reliability of the electric motor can be improved as in the first or second embodiment.

Embodiment 4 FIG.
In the first to third embodiments, the present invention has been implemented by forming a plurality of gaps between adjacent permanent magnets 44. It is possible to implement the present invention even if one gap is formed between adjacent permanent magnets 44 and the opening areas of the gaps are different. In the fourth embodiment, items not particularly described are the same as those in the first to third embodiments, and the same functions and configurations are described using the same reference numerals.

  FIG. 6 is an enlarged view of a main part showing the electromagnetic steel sheet 42 according to Embodiment 4 of the present invention. Here, Fig.6 (a) is a principal part enlarged view which shows the electromagnetic steel plate 42a in which the space | gap part with a small opening area was formed. FIG. 6B is an enlarged view of a main part showing the electromagnetic steel sheet 42b in which a gap having a large opening area is formed. FIG. 6A and FIG. 6B show the position of the Q portion shown in FIG. In each of FIG. 6A and FIG. 6B, for comparison, the gap portion of the electromagnetic steel plate 42b and the gap portion of the electromagnetic steel plate 42a are indicated by imaginary lines.

  As shown in FIGS. 6A and 6B, a substantially triangular gap 45 is formed between adjacent permanent magnets 44.

  Here, as shown in FIGS. 4A and 4B, the size of the gap 45a formed in the electromagnetic steel plate 42a is smaller than the size of the gap 45b formed in the electromagnetic steel plate 42b. ing. As a result, the magnetic steel sheet 42b in which the gap portion having a large opening area is formed has a small amount of steel plate material serving as a magnetic field flow path between the adjacent permanent magnets 44. Therefore, the magnetic field between the end portions of the adjacent permanent magnets 44 is reduced. It is possible to improve the performance of the electric motor by suppressing the short circuit and increasing the magnetic flux amount interlinking the stator windings. In addition, the magnetic steel sheet 42a in which the gap portion having a small opening area is formed includes a large amount of steel sheet material between the adjacent permanent magnets 44. Therefore, it is possible to maintain the mechanical strength and improve the reliability of the electric motor. . Then, by laminating these electromagnetic steel plates 42a and 42b to constitute the rotor core 41, both the performance and reliability of the electric motor are improved.

  Also in the rotor 40 configured as described above, both the performance and reliability of the electric motor can be improved as in the first to third embodiments.

Embodiment 5 FIG.
In the first to fourth embodiments, a through hole is formed between adjacent permanent magnets 44, and the present invention has been implemented with this through hole as a gap. It is possible to implement the present invention even if notches are formed between adjacent permanent magnets 44 and the areas of these notches are made different. In Embodiment 5, items that are not particularly described are the same as those in Embodiments 1 to 4, and the same functions and configurations are described using the same reference numerals.

  FIG. 7 is an enlarged view of a main part showing an electromagnetic steel sheet 42 according to Embodiment 5 of the present invention. Here, Fig.7 (a) is a principal part enlarged view which shows the electromagnetic steel plate 42a in which the space | gap part with a small notch area was formed. Moreover, FIG.7 (b) is a principal part enlarged view which shows the electromagnetic steel plate 42b in which the space | gap part with a large notch area was formed. 7A and 7B show the position of the Q portion shown in FIG. 2A. In each of FIG. 7A and FIG. 7B, for comparison, the gap of the electromagnetic steel plate 42b and the gap of the electromagnetic steel plate 42a are indicated by imaginary lines.

  As shown in FIGS. 7A and 7B, a gap 45 is formed between adjacent permanent magnets 44, in which the outer peripheral surface of the electromagnetic steel sheet 42 is cut out in a substantially triangular shape.

  Here, as shown in FIGS. 7A and 7B, the size of the gap 45a formed in the electromagnetic steel plate 42a is smaller than the size of the gap 45b formed in the electromagnetic steel plate 42b. ing. As a result, the magnetic steel sheet 42b in which the gap portion having a large opening area is formed has a small amount of steel plate material serving as a magnetic field flow path between the adjacent permanent magnets 44. Therefore, the magnetic field between the end portions of the adjacent permanent magnets 44 is reduced. It is possible to improve the performance of the electric motor by suppressing the short circuit and increasing the magnetic flux amount interlinking the stator windings. In addition, the magnetic steel sheet 42a in which the gap portion having a small opening area is formed includes a large amount of steel sheet material between the adjacent permanent magnets 44. Therefore, it is possible to maintain the mechanical strength and improve the reliability of the electric motor. . Then, by laminating these electromagnetic steel plates 42a and 42b to constitute the rotor core 41, both the performance and reliability of the electric motor are improved.

  Also in the rotor 40 configured as described above, both the performance and reliability of the electric motor can be improved as in the first to fourth embodiments.

  In addition, in this Embodiment 5, although the space | gap part was formed only by the notch, you may form a space | gap part by a combination with the space | gap part which concerns on Embodiment 1- Embodiment 4, and a through-hole and a notch.

  As mentioned above, although Embodiment 1-Embodiment 5 demonstrated the example which used the electric motor which concerns on this invention for the refrigerant compressor 100, of course, you may implement this invention in the other electric motors used for various industrial machines. .

  DESCRIPTION OF SYMBOLS 1 Refrigerating machine oil, 10 airtight container, 11 sump, 12 suction side piping, 13 discharge side piping, 15 discharge space, 16 compression part, 17 drive part, 18 compression chamber, 20 stator, 21 crankshaft, 22 eccentric pin part , 23 Oil supply flow path, 24 orbiting scroll, 25 lap part, 26 orbiting scroll boss part, 27 thrust surface, 28 fixed scroll, 29 lap part, 30 discharge port, 31 frame, 32 oil drain hole, 33 Oldham ring, 40 rotations 41, rotor core, 42 (42a, 42b) electromagnetic steel plate, 43 magnet insertion hole, 44 permanent magnet, 45 (45a, 45b) gap, 46 (46a, 46b) gap, 47 (47a, 47b) bridge Part, 48 (48a, 48b) bridge part, 49 gap part, 50 rotating shaft insertion hole, 100 refrigerant compressor .

Claims (7)

A stator having a multi-phase stator winding mounted on the stator core;
A rotor disposed rotatably on the inner peripheral surface side of the stator core;
In an electric motor with
The rotor is
A rotor core having a plurality of magnet insertion holes for mounting permanent magnets, and a gap formed between the adjacent magnet insertion holes;
A permanent magnet inserted into the magnet insertion hole;
With
The rotor core is
An electric motor comprising a plurality of types of electromagnetic steel plates having different opening areas of the gaps. The rotor core is
2. The electric motor according to claim 1, wherein an opening area of the gap portion in the electromagnetic steel sheets laminated on the upper and lower portions is smaller than an opening area of the gap portion in the electromagnetic steel sheets laminated on a central portion. . The gap is formed by at least one of a through hole and a notch,
3. The electric motor according to claim 1, wherein the opening area of the gap is made different by changing an opening area of at least one of the through hole and the notch. At least one of the through holes is formed so as to extend from each end of the magnet insertion hole to near the outer peripheral surface of the electromagnetic steel sheet,
Forming a bridge portion between the end of the through hole and the outer peripheral surface of the electromagnetic steel sheet;
The electric motor according to claim 3, wherein the opening area of the gap is made different by making the width of the bridge part different. At least one of the through holes is formed so as to extend from each end of the magnet insertion hole to near the outer peripheral surface of the electromagnetic steel sheet,
Extending the end of the through hole on the electromagnetic steel sheet side along the outer peripheral surface of the electromagnetic steel sheet,
Forming a bridge portion between the end portion of the through hole on the electromagnetic steel sheet side and the outer peripheral surface of the electromagnetic steel sheet;
The electric motor according to claim 3 or 4, wherein the opening area of the gap is made different by making the length of the bridge part different. The gap is formed by at least one of a through hole and a notch,
The electric motor according to any one of claims 1 to 5, wherein the opening area of the gap is made different by changing the number of at least one of the through hole and the notch.   A compressor using the electric motor according to any one of claims 1 to 6.

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