JP2012124976A - Permanent magnet type motor and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small size permanent magnet type motor which suppresses vibrations by increasing inertia of a rotator, increases output torque using magnetic flux of a coil end, and achieves high output with small vibrations.SOLUTION: A permanent magnet type motor according to this invention includes a stator and a rotator provided at the inner side of the stator so as to have a gap therebetween and has a field part in which permanent magnets are provided. The rotator is provided near at least one of axial end parts of the field part and is formed so as to be larger than an outer diameter of the field part. Further, the rotator is extended to a position that faces a coil end of the stator and includes a magnetic material part formed by a magnetic material. The coil end of the stator which faces the magnetic material part is inclined in a direction of a back yoke of the stator.

Description

  The present invention relates to a permanent magnet type electric motor in which a field is disposed inside an armature and is characterized by the structure of the field and armature. The present invention also relates to a compressor on which the permanent magnet type electric motor is mounted.

  In the method of reducing the vibration of the motor compressor having a large load torque fluctuation by the torque control, the current waveform becomes a distorted waveform in order to bring the motor torque TM close to the load torque TL, and the efficiency of the motor is reduced. Also had the problem of becoming complicated. Therefore, in order to provide a motor compressor that is inexpensive, efficient, and has little vibration even without complicated control, a configuration in which inertia is added to the drive shaft of the motor compressor in addition to the motor unit and mechanical unit. A motor compressor has been proposed. In this motor compressor, a rotating body with a large moment of inertia has large energy, and automatic adjustment is performed so that speed fluctuations are reduced, and fluctuations in current and voltage supplied to the motor are also reduced, resulting in an efficient motor compressor. Is obtained (see, for example, Patent Document 1).

  In addition, in order to provide an electric motor capable of improving torque and energy efficiency and a manufacturing method thereof, a stator core having a plurality of slots formed in the circumferential direction, and a stator having a stator coil wound in the slots. And a rotor rotated around the motor shaft by a rotating magnetic field formed by the stator, at least one of both coil ends of the stator coil positioned axially outward of the stator core, There has been proposed an electric motor that is bent so that the tip is close to the rotor (see, for example, Patent Document 2).

JP 2001-304121 A JP 2000-278903 A

  In recent years, there is a tendency for higher efficiency and higher quality in permanent magnet type electric motors that are increasingly applied to various products.

  In particular, air conditioners used as household appliances are highly demanded for high efficiency and low noise because they are used indoors and outdoors or are closely related to daily life. There are also requirements for installation and design.

  An important component in the air conditioner is a compressor that compresses a refrigerant. Examples of the compressor include a rotary compressor, a scroll compressor, and a reciprocating compressor. These compressors include a compression mechanism and an electric motor that drives the compression mechanism. A permanent magnet type electric motor is generally used as the electric motor. Due to the above requirements for air conditioners, high efficiency, low vibration and downsizing are always required for compressors and permanent magnet type motors.

  By the way, since the compressor repeats the process of compressing the refrigerant and the process of sucking the refrigerant, the compressor has a feature that the fluctuation of the load torque is large. Large fluctuations in the load torque are likely to cause vibration and noise. However, in the conventional example (for example, Patent Document 1), an inertia is provided on the rotor shaft in order to suppress fluctuations in the load torque. By providing the inertia, the inertia moment of the rotor can be increased, and the speed fluctuation of the motor (proportional to the reciprocal of the inertia moment) is suppressed.

  However, the inertia provided in the rotor is limited to the function of imparting a moment of inertia to the rotor, and has become one of the causes of an increase in size, such as an increase in compressor size for a reduction in motor size.

  In addition, in the example in which the stator coil end of the motor is tilted to the rotor side as in Patent Document 2 above, although the amount of magnetic flux supplied to the rotor can be increased, when attaching a magnetic member to the frame side or tilting both sides Complicated structure, such as tilting the coil end to a fixed angle after the rotor is installed. For this reason, it has been difficult to adjust the angle of the coil and to fix the position with the magnetic member. Furthermore, in a device in which a wall such as a frame is not provided near the coil end in the axial direction (for example, the aforementioned compressor), it is difficult to attach the magnetic member itself.

  The present invention has been made to solve the above-described problems. The rotor is made to have high inertia to suppress vibration, and the output torque can be increased by utilizing the magnetic flux at the coil end. A high-power, low-vibration permanent magnet type motor and compressor are provided.

The permanent magnet type electric motor according to the present invention is a permanent magnet type electric motor comprising a stator and a rotor having a field portion provided inside the stator via a gap and provided with a permanent magnet.
The rotor is provided in the vicinity of at least one of the axial ends of the field part, and is expanded to a position that is larger than the outer diameter of the field part and faces the coil end of the stator. A magnetic body portion
The coil end of the stator facing the magnetic body is tilted in the back yoke direction of the stator.

  The permanent magnet type electric motor according to the present invention is expanded to a position that is larger than the outer diameter of the field part and faces the coil end of the stator, and the magnetic part made of a magnetic material is used as the field part of the rotor. By providing it in the vicinity of at least one of the axial ends of the rotor, the rotor can be made high inertia to suppress vibrations, and the output torque can be increased using the magnetic flux at the coil end.・ Low vibration can be achieved.

FIG. 4 is a diagram showing the first embodiment, and is a longitudinal sectional view of a permanent magnet type electric motor 100. FIG. 3 shows the first embodiment, and is a plan view of the permanent magnet type electric motor 100. FIG. FIG. 5 shows the first embodiment and is a longitudinal sectional view of a stator 10. FIG. 5 shows the first embodiment and is a plan view of the stator 10. FIG. 5 shows the first embodiment and is a plan view of the stator core 11. FIG. 5 shows the first embodiment, and is a perspective view of a coil 12. FIG. 5 shows the first embodiment and is a longitudinal sectional view of a rotor 20. FIG. 3 shows the first embodiment and is a plan view of a field magnet section 30. FIG. FIG. 5 shows the first embodiment and is a plan view of a yoke 31. FIG. FIG. 5 shows the first embodiment and is a plan view of a magnetic body portion 40. FIG. FIG. 5 shows the first embodiment, and is a longitudinal sectional view of a rotary compressor 500. It is a figure which shows Embodiment 1, and is a longitudinal cross-sectional view of the permanent magnet type electric motor 200 of a modification. FIG. 5 shows the first embodiment, and is an exploded front view of the magnetic part 240. FIG. 5 shows the first embodiment and is a plan view of a magnetic body portion 240. FIG. FIG. 5 shows the first embodiment, and is a longitudinal sectional view of a modified permanent magnet type electric motor 300. FIG. 5 shows the first embodiment and is a perspective view of a coil 312. FIG. 5 shows the first embodiment, and is a longitudinal sectional view of a modified permanent magnet type electric motor 400. FIG. 5 shows the first embodiment, and is a longitudinal sectional view of a modified permanent magnet type electric motor 600.

Embodiment 1 FIG.
1 and FIG. 2 are diagrams showing Embodiment 1, FIG. 1 is a longitudinal sectional view of a permanent magnet type electric motor 100, and FIG. 2 is a plan view of the permanent magnet type electric motor 100. FIG.

  The permanent magnet type electric motor 100 will be described with reference to FIGS. 1 and 2. The permanent magnet type electric motor 100 is, for example, a 9-slot, 6-pole embedded magnet (IPM) brushless DC motor.

  The permanent magnet type electric motor 100 includes a stator 10 and a rotor 20 disposed inside the stator 10 via a gap 60 (for example, a radial dimension is about 0.2 to 2.0 mm). 1 and 2 will be described later.

  First, the stator 10 will be described. 3 and 4 are diagrams showing the first embodiment. FIG. 3 is a longitudinal sectional view of the stator 10 and FIG. 4 is a plan view of the stator 10. FIG. The stator 10 includes a stator core 11 and a coil 12 that is wound around the stator core 11 via an insulating portion (not shown). The coil end 12a will be described later.

  FIG. 5 shows the first embodiment, and is a plan view of the stator core 11. The stator core 11 has a substantially donut shape as a whole. The stator core 11 is manufactured by punching a magnetic steel sheet having a thickness of about 0.1 to 1.5 mm into a predetermined shape, stacking a predetermined number of sheets in the axial direction, and fixing by punching or welding.

  As shown in FIG. 5, the stator core 11 has a cylindrical core back 14 formed on the outer peripheral portion. A plurality (9 in this case) of teeth 13 are formed radially from the core back 14. The circumferential width of each tooth 13 is substantially constant. The distal end portion (on the gap 60 side) of the tooth 13 projects to both sides in the circumferential direction, and a projecting portion 13a is formed.

  A slot 15 (space) is formed between two adjacent teeth 13. Since the circumferential width of each tooth 13 is substantially constant, the circumferential width of the slot 15 gradually increases from the inside toward the core back 14. The slot 15 is open to the gap 60 and is referred to as a slot opening 15a.

  FIG. 6 is a diagram showing the first embodiment and is a perspective view of the coil 12. The coil 12 is wound so as to fit in the slot 15 of the stator core 11. As for the coil 12, the axial direction edge part (coil end 12a) by the side of the magnetic body part 40 of the rotor 20 mentioned later is bent by the core back 14 side. The other axial end (coil end 12b) is not bent toward the core back 14 side.

  As described above, the coil 12 has an axial end (coil end 12a) on the side of the magnetic body 40 of the rotor 20, which will be described later, bent on the core back 14 side. It is preferable not to provide an axial wall on the side. Insulating parts used in general concentrated winding coils are often provided with walls in order to prevent winding disturbance of the coil 12, but in this embodiment, a jig that becomes a wall from the core back 14 side during winding. It is preferable to prevent the coil 12 from being disturbed by hitting it.

  7 to 10 show the first embodiment. FIG. 7 is a longitudinal sectional view of the rotor 20, FIG. 8 is a plan view of the field magnet portion 30, FIG. 9 is a plan view of the yoke 31, and FIG. 3 is a plan view of a body part 40. FIG.

  Next, the rotor 20 will be described with reference to FIGS. As shown in FIG. 7, the rotor 20 includes a field part 30, a magnetic part 40 provided in the vicinity of one axial end of the field part 30, and the field part 30 and the magnetic part 40. And a shaft 50 that penetrates and is fixed to each other.

  As shown in FIG. 8, the field magnet portion 30 includes a yoke 31 and a plurality (six in this case) of permanent magnets 32 embedded in the yoke 31. As the permanent magnet 32, a rare earth sintered magnet (neodymium, iron, boron as a main component), a ferrite sintered magnet, or the like is used.

  As shown in FIG. 9, the yoke 31 has a substantially cylindrical shape as a whole. The yoke 31 is manufactured by punching an electromagnetic steel sheet having a thickness of about 0.1 to 1.5 mm into a predetermined shape, stacking a predetermined number of sheets in the axial direction, and fixing by punching or welding. A plurality of (here, six) magnet insertion holes 33 into which the permanent magnets 32 are inserted are formed in the yoke 31 along the outer peripheral edge. The six magnet insertion holes 33 are substantially hexagonal. A shaft hole 34 into which the shaft 50 is fitted is formed at the center of the yoke 31.

  As shown in FIG. 7, the magnetic part 40 is provided in the vicinity of one axial end of the field part 30. The magnetic body portion 40 has an outer diameter larger than that of the field magnet portion 30. The outer diameter of the magnetic body portion 40 is expanded to a position facing one coil end 12a of the stator 10.

  As shown in FIG. 10, the magnetic body portion 40 has a concavo-convex shape in the circumferential direction, and the convex portions 40 a are arranged in phase with the poles of the field portion 30. Since the field portion 30 has six poles, six convex portions 40a are also formed. A shaft hole 40 b into which the shaft 50 is fitted is formed at the center of the magnetic body portion 40.

  With the above configuration, the magnetic flux of the coil end 12a of the stator 10 can be used effectively. That is, by tilting the coil end 12a (bending toward the core back 14), the interlinkage magnetic flux of the coil end 12a when the armature current (stator current) flows is directed in the axial direction. The magnetic flux of the coil end 12a is picked up by the magnetic body portion 40 of the rotor 20 whose outer diameter is extended to the vicinity of the coil end 12a, and torque can be output.

  Moreover, since the end surface of the stator core 11 and the coil end 12a approach each other by tilting the coil end 12a toward the core back 14, the magnetic permeability in the coil end 12a can be increased without providing a new magnetic material. , More magnetic flux can flow.

  The torque generated by the coil end 12a and the magnetic body portion 40 is a reluctance torque. Generally, distributed winding can produce a larger salient pole ratio, and in this case, the coil 12 is more preferably distributed winding (for example, lap winding).

  Further, by providing the rotor 20 with the large-diameter magnetic body portion 40, the moment of inertia of the rotor 20 can be easily improved, and the role of conventional inertia (reducing rotational speed fluctuation) can be sufficiently achieved. be able to.

  FIG. 11 shows the first embodiment, and is a longitudinal sectional view of the rotary compressor 500. For example, the permanent magnet type electric motor 100 shown in FIG. 1 is mounted on a rotary compressor 500 (an example of a compressor) that is an example of a compressor for refrigeration and air conditioning. In the permanent magnet type electric motor 100, the rotor 20 is provided with the magnetic body portion 40, so that the rotor 20 is made high inertia to suppress vibrations, and the output torque can be increased using the magnetic flux of the coil end 12a. In addition, since it is a small, high output, low vibration permanent magnet type electric motor, an excellent rotary compressor 500 can be obtained.

  Hereinafter, a rotary compressor 500 (an example of a compressor) equipped with the permanent magnet type electric motor 100 shown in FIG. 1 will be described with reference to FIG.

  A rotary compressor 500 shown in FIG. 11 is of a vertical type in which the inside of the hermetic container 70 is high pressure. A compression element 501 is housed in the lower part of the sealed container 70. A permanent magnet type electric motor 100 that is an electric element that drives the compression element 501 is accommodated above the compression element 501 in the upper part of the sealed container 70.

  Refrigerating machine oil 90 that lubricates the sliding portions of the compression element 501 is stored at the bottom of the sealed container 70.

  First, the configuration of the compression element 501 will be described. The cylinder 1 in which the compression chamber is formed has a cylinder chamber (not shown) that is a space having a substantially circular outer periphery in a plan view and a substantially circular space in a plan view. The cylinder chamber is open at both axial ends. The cylinder 1 has a predetermined axial height in a side view.

  Parallel vane grooves (not shown) that communicate with a cylinder chamber that is a substantially circular space of the cylinder 1 and extend in the radial direction are provided so as to penetrate in the axial direction.

  A back chamber (not shown), which is a substantially circular space in plan view, communicates with the vane groove is provided on the back surface (outside) of the vane groove.

  An intake port (not shown) through which intake gas from the refrigeration cycle passes through the cylinder 1 passes through the cylinder chamber from the outer peripheral surface of the cylinder 1.

  The cylinder 1 is provided with a discharge port (not shown) in which the vicinity of the edge of the circle forming the cylinder chamber which is a substantially circular space (the end surface on the permanent magnet type electric motor 100 side) is cut out.

  The material of the cylinder 1 is gray cast iron, sintered, carbon steel or the like.

  The rolling piston 2 rotates eccentrically in the cylinder chamber. The rolling piston 2 is ring-shaped, and the inner periphery of the rolling piston 2 is slidably fitted to the eccentric shaft portion 50a of the shaft 50.

  It is assembled so that there is always a constant gap between the outer periphery of the rolling piston 2 and the inner wall of the cylinder chamber of the cylinder 1.

  The material of the rolling piston 2 is alloy steel containing chromium or the like.

  The vane 3 is accommodated in the vane groove of the cylinder 1, and the vane 3 is always pressed against the rolling piston 2 by the vane spring 8 provided in the back pressure chamber. In the rotary compressor 500, since the inside of the sealed container 70 is at a high pressure, when the operation is started, a force due to a differential pressure between the high pressure in the sealed container 70 and the pressure in the cylinder chamber acts on the back surface (back pressure chamber side) of the vane 3. Therefore, the vane spring 8 is mainly used for the purpose of pressing the vane 3 against the rolling piston 2 when the rotary compressor 500 is started up (in a state where there is no difference in pressure between the inside of the sealed container 70 and the cylinder chamber).

  The shape of the vane 3 is a flat shape (the thickness in the circumferential direction is smaller than the length in the radial direction and the axial direction).

  High-speed tool steel is mainly used as the material of the vane 3.

  The main bearing 4 is slidably fitted to a main shaft portion 50b (a portion above the eccentric shaft portion 50a and fitted to the rotor 20) of the shaft 50, and a cylinder chamber (vane groove is also provided) of the cylinder 1. One end face (including the permanent magnet type electric motor 100 side) is closed.

  The main bearing 4 includes a discharge valve (not shown). However, it may be attached to either one or both of the main bearing 4 and the sub-bearing 5.

  The main bearing 4 has a substantially inverted T shape when viewed from the side.

  The sub-bearing 5 is slidably fitted into a sub-shaft portion 50c (a portion below the eccentric shaft portion 50a) of the shaft 50, and the other end face (refrigerating machine oil) of the cylinder chamber (including the vane groove) of the cylinder 1. 90 side) is closed.

  The secondary bearing 5 is substantially T-shaped in a side view.

  The material of the main bearing 4 and the sub bearing 5 is the same as that of the cylinder 1, and is made of gray cast iron, sintered, carbon steel, or the like.

  A discharge muffler 7 is attached to the main bearing 4 on the outer side (permanent magnet type electric motor 100 side). The high-temperature and high-pressure discharge gas discharged from the discharge valve of the main bearing 4 enters the discharge muffler 7 at one end and is then discharged from the discharge muffler 7 into the sealed container 70. However, the discharge muffler 7 may be provided on the sub-bearing 5 side.

  A suction muffler 51 is provided beside the hermetic container 70 to suck low-pressure refrigerant gas from the refrigeration cycle and prevent liquid refrigerant from being directly drawn into the cylinder chamber of the cylinder 1 when the liquid refrigerant returns. The suction muffler 51 is connected to the suction port of the cylinder 1 via the suction pipe 52. The main body of the suction muffler 51 is fixed to the side surface of the sealed container 70 by welding or the like.

  A terminal 74 (referred to as a glass terminal) connected to a power source that is a power supply source is fixed to the sealed container 70 by welding. In the example of FIG. 11, a terminal 74 is provided on the upper surface of the sealed container 70. The lead wire 73 from the permanent magnet type electric motor 100 which is an electric element is connected to the terminal 74.

  A discharge pipe 75 having both ends opened is inserted into the upper surface of the sealed container 70. The discharge gas discharged from the compression element 501 is discharged from the sealed container 70 through the discharge pipe 75 to the external refrigeration cycle.

  A general operation of the rotary compressor 500 will be described. When electric power is supplied from the terminal 74 and the lead wire 73 to the stator 10 of the permanent magnet type electric motor 100 that is an electric element, the rotor 20 rotates. Then, the shaft 50 fixed to the rotor 20 rotates, and accordingly, the rolling piston 2 rotates eccentrically in the cylinder chamber of the cylinder 1. A space between the cylinder chamber of the cylinder 1 and the rolling piston 2 is divided into two by a vane 3. As the shaft 50 rotates, the volume of these two spaces changes, the volume gradually increases on one side and the refrigerant is sucked in from the suction muffler 51, and the volume gradually decreases on the other side. The gas is compressed. The compressed discharge gas is discharged once from the discharge muffler 7 into the sealed container 70, and further passes through the permanent magnet type electric motor 100, which is an electric element, to the outside of the sealed container 70 through the discharge pipe 75 on the upper surface of the sealed container 70. Discharged.

  The discharge gas that passes through the permanent magnet type electric motor 100 that is an electric element includes, for example, an air hole (through hole) of the rotor 20 of the permanent magnet type electric motor 100 (not shown) and a slot opening (not shown) of the stator 10. It passes through the gap 60 (see FIG. 1).

  FIG. 12 shows the first embodiment, and is a longitudinal sectional view of a permanent magnet type electric motor 200 of a modified example. The permanent magnet type electric motor 200 of the modification shown in FIG. 12 is different from the permanent magnet type electric motor 100 in the magnetic body portion 240. Other configurations are the same.

  The modified permanent magnet type electric motor 200 includes a stator 210 and a rotor 220.

  The stator 210 has the same configuration as the stator 10 of the permanent magnet type electric motor 100. Therefore, the description is omitted.

  The rotor 220 is fixed through the field portion 230, the magnetic body portion 240 provided in the vicinity of one axial end of the field portion 230, and the field portion 230 and the magnetic body portion 240, respectively. And a shaft 250.

  The field magnet 230 and the shaft 250 are the same as the field magnet 30 and the shaft 50 of the rotor 20 (FIG. 7).

  FIGS. 13 and 14 are diagrams showing the first embodiment, FIG. 13 is an exploded front view of the magnetic body portion 240, and FIG. 14 is a plan view of the magnetic body portion 240. The magnetic body portion 240 is formed in a disk shape and has a plurality of concave portions 240c (for the number of poles of the field portion: 6) that house the second permanent magnet 255 on the surface facing the field portion 230. The second permanent magnet 255 is arranged so as to be in phase with the pole center of the field magnet portion 230.

  The torque generated by the coil end 212a and the magnetic body portion 240 is a magnet torque.

  FIGS. 15 and 16 show the first embodiment, FIG. 15 is a longitudinal sectional view of a permanent magnet type electric motor 300 according to a modification, and FIG. 16 is a perspective view of a coil 312.

  A modified permanent magnet type electric motor 300 will be described with reference to FIGS. 15 and 16. In the modified permanent magnet type electric motor 300, the rotor 320 includes a magnetic part 340 in the vicinity of both axial ends of the field part 330. The magnetic part 340 is the same as the magnetic part 40 shown in FIG.

  As shown in FIG. 16, the coil 312 has two coil ends 312a bent toward the core back 314 (not shown, the same as the core back 14).

  With the above configuration, the magnetic flux of the coil end 312a of the stator 310 can be used more effectively. The magnetic flux linkage of the coil end 312a is picked up by the two magnetic parts 340 of the rotor 320 whose outer diameter is extended to the vicinity of the coil end 312a, and a reluctance torque larger than that of the permanent magnet type electric motor 100 can be output. it can.

  Further, by providing the rotor 320 with the large-diameter magnetic body portion 340, the moment of inertia of the rotor 320 can be further improved, and the role of conventional inertia (reducing rotational speed fluctuation) can be sufficiently achieved. Can do.

  In the case of the modified permanent magnet type electric motor 300, any one of the magnetic body portions 340 needs to be combined after the stator 310 and the rotor 320 are assembled.

  FIG. 17 shows the first embodiment, and is a longitudinal sectional view of a permanent magnet type electric motor 400 of a modification. In the permanent magnet type electric motor 400, the rotor 420 includes a magnetic body portion 440 in the vicinity of both end portions in the axial direction of the field magnet portion 430. The magnetic part 440 is the same as the magnetic part 240 shown in FIG. That is, the magnetic body portion 440 has a disk shape and a plurality of concave portions 440c (for the number of poles of the field portion: 6) that house the second permanent magnet 455 formed on the surface facing the field portion 430. Yes. The second permanent magnet 455 is arranged so as to be in phase with the pole center of the field part 430.

  The magnet torque generated by the coil end 412a and the magnetic body portion 440 is doubled as compared with the permanent magnet type electric motor 200.

  Further, the inertia moment of the rotor 420 can be further improved as compared with the permanent magnet type electric motor 200.

  FIG. 18 shows the first embodiment, and is a longitudinal sectional view of a permanent magnet type electric motor 600 of a modification. In the modified permanent magnet type electric motor 600, the rotor 620 includes two types of magnetic body portions 640 in the vicinity of both axial ends of the field magnet portion 630. One magnetic body portion 640 is the same as the magnetic body portion 40 shown in FIG. The magnetic body portion 640 has a concavo-convex shape in the circumferential direction, and the convex portions 640 a (not shown) are arranged in phase with the poles of the field portion 630. Since the field part 630 has six poles, six convex parts 640a are also formed.

  The other magnetic part 640 is the same as the magnetic part 240 shown in FIG. The other magnetic body portion 640 similar to the magnetic body portion 240 shown in FIG. 13 has a disc shape and has a plurality of second permanent magnets 655 accommodated on the surface facing the field portion 630 (for the number of poles of the field portion). : 6) recesses 640c are formed. The second permanent magnet 655 is arranged so as to be in phase with the pole center of the field part 630.

  With the above configuration, the magnetic flux linkage of the coil end 612a is picked up by one magnetic body portion 640 of the rotor 620 whose outer diameter is extended to the vicinity of the coil end 612a, and reluctance torque can be output. .

  Magnet torque is generated by the coil end 612a and the other magnetic body portion 640 (having the second permanent magnet 655).

  Further, the moment of inertia of the rotor 620 can be further improved as compared with the permanent magnet type electric motor 100.

  In the present embodiment, an example in which the rotor is a magnet embedded type (IPM) is shown, but a surface arrangement type (SPM) may be used.

  1 cylinder, 2 rolling piston, 3 vane, 4 main bearing, 5 sub bearing, 7 discharge muffler, 8 vane spring, 10 stator, 11 stator core, 12 coil, 12a coil end, 12b coil end, 13 teeth, 13a Overhang, 14 core back, 15 slot, 15a slot opening, 20 rotor, 30 field magnet, 31 yoke, 32 permanent magnet, 33 magnet insertion hole, 34 shaft hole, 40 magnetic body, 40a convex, 40b Shaft hole, 50 shaft, 50a Eccentric shaft portion, 50b Main shaft portion, 50c Subshaft portion, 51 Suction muffler, 52 Suction pipe, 60 Air gap, 70 Airtight container, 73 Lead wire, 74 Terminal, 75 Discharge pipe, 90 Refrigerating machine oil, 100 permanent magnet type motor, 200 permanent magnet type motor, 210 stator, 212a coil , 220 rotor, 230 field part, 240 magnetic body part, 250 axis, 255 second permanent magnet, 300 permanent magnet motor, 312 coil, 312a coil end, 314 core back, 320 rotor, 330 field Part, 340 magnetic part, 400 permanent magnet type motor, 420 rotor, 430 field part, 440 magnetic part, 440c recess, 455 second permanent magnet, 500 rotary compressor, 501 compression element, 600 permanent magnet type Electric motor, 620 rotor, 630 field part, 640 magnetic body part, 640a convex part, 640c concave part, 655 second permanent magnet.

Claims (6)

A permanent magnet type electric motor comprising a stator and a rotor having a field part provided inside the stator via a gap and provided with a permanent magnet,
The rotor is provided in the vicinity of at least one of the axial ends of the field part, and is larger than the outer diameter of the field part and extended to a position facing the coil end of the stator, It has a magnetic part composed of a magnetic substance,
The permanent magnet type electric motor, wherein a coil end of the stator facing the magnetic body portion is tilted in a back yoke direction of the stator.   The magnetic body portion has a concavo-convex shape in a circumferential direction, and is provided with the same number of convex portions as the number of poles of the field portion arranged so as to be in phase with the poles of the field portion. The permanent magnet type electric motor according to claim 1.   The magnetic part has concave portions as many as the number of poles of the field part on the surface on the field part side, and the second permanent magnet is in phase with the pole center of the field part in the concave part. The permanent magnet type electric motor according to claim 1, wherein the permanent magnet type electric motor is provided.   The permanent magnet type electric motor according to any one of claims 1 to 3, wherein the stator coil is a distributed winding of a lap winding.   The permanent magnet type electric motor according to any one of claims 1 to 3, wherein the stator coil is concentrated winding.   A compressor comprising the permanent magnet motor according to any one of claims 1 to 5.

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