WO2003079516A1 - Moteur de type a aimants permanents et compresseur dote de ce moteur - Google Patents
Moteur de type a aimants permanents et compresseur dote de ce moteur Download PDFInfo
- Publication number
- WO2003079516A1 WO2003079516A1 PCT/JP2003/002281 JP0302281W WO03079516A1 WO 2003079516 A1 WO2003079516 A1 WO 2003079516A1 JP 0302281 W JP0302281 W JP 0302281W WO 03079516 A1 WO03079516 A1 WO 03079516A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnet
- center
- magnetic flux
- yoke
- insertion part
- Prior art date
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- 230000004907 flux Effects 0.000 claims abstract description 118
- 230000037431 insertion Effects 0.000 claims description 118
- 238000003780 insertion Methods 0.000 claims description 118
- 230000004888 barrier function Effects 0.000 claims description 27
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000005347 demagnetization Effects 0.000 abstract description 28
- 230000002093 peripheral effect Effects 0.000 description 17
- 239000003507 refrigerant Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 238000004804 winding Methods 0.000 description 11
- 239000010687 lubricating oil Substances 0.000 description 9
- 230000009467 reduction Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention belongs to the technical field of a permanent magnet type electric motor and a compressor using the same. (Background technology)
- compressors having a compression mechanism for compressing working gas in a casing and an electric motor drivingly connected to and driving the compression mechanism are well known in general, for example, refrigeration cycles of air conditioners and the like.
- a motor for this type of compressor a stator (stator) that generates a rotating magnetic field by energizing a winding mounted on a stator yoke (core) made of magnetic material,
- a rotor (rotor) that is rotatably arranged in the rotor and has a plurality of permanent magnets forming magnetic poles embedded in the magnet insertion portion of the rotor yoke (core) so as to be arranged in the circumferential direction. Equipped with a permanent magnet type electric motor.
- the motor is heated in a high temperature environment in which the motor is used, or the rotor is driven by a stator current for outputting a required torque of the motor. If there is a reverse magnetic field, there is a problem that each permanent magnet is demagnetized by the heating or the reverse magnetic field.
- a magnet having a large coercive force or a magnet having a large thickness in the magnetic field direction may be used.
- the present invention has been made in view of the above points, and an object of the present invention is to reduce the number of magnets as a whole while maintaining cost reduction by improving the characteristics of each magnet inserted into the rotor yoke.
- An object of the present invention is to improve the maximum torque and efficiency of a motor by preventing magnetism and suppressing a decrease in magnetic flux density.
- the present invention focuses on the fact that each magnet in the rotor yoke is not demagnetized as a whole by a reverse magnetic field but has a portion that is easily demagnetized. Distribute the coercive force and magnetic flux density so that they are different in each part, so that the coercive force is increased in the parts that are easily demagnetized, and the magnetic flux density is increased in the parts that are not easily demagnetized. I made it.
- a plurality of permanent magnets forming magnetic poles are provided in the stator (2 1).
- the (32) is divided into a plurality of pieces along the yoke circumferential direction.
- the magnets located on the side where demagnetization is likely to occur are retained. It is characterized in that the magnetic force is larger than the magnet located on the hardly demagnetized side, and the magnetic flux density of the magnet located on the hardly demagnetized side is larger than the magnet located on the side that is easily demagnetized. .
- each magnet (3 2) of the rotor (25) is divided into a plurality of pieces along the yoke circumferential direction, and among these magnets (33) and (34), demagnetization is performed. Since the coercive force of the magnet located on the side that is easy to demagnetize is greater than the magnet located on the side that is hard to demagnetize, for example, the magnet located on the side that is easily demagnetized by the reverse magnetic field due to the stator current becomes difficult to demagnetize. The demagnetization of the magnet (32) can be prevented as a whole.
- the magnet (32) does not have a thickness in the magnetic field direction, the amount of material used for the magnet (32) is reduced, cost reduction is maintained, and demagnetization of the magnet (32) is prevented. In addition, it is possible to improve the maximum torque and the efficiency of the electric motor by suppressing the decrease in the magnetic flux density.
- each of the magnets (32) includes a center magnet (33) located at the center in the width direction of the magnet insertion portion (31), and an end located at the end of the magnet insertion portion (31).
- Magnets (3 4) and (34) the center magnet (33) having a larger coercive force than the end magnets (3 4) and (34), and the end magnets (34) and (34) Can be larger than the central magnet (33).
- the center of the magnet (32) in the width direction is more easily demagnetized than the end.
- the magnet (32) is connected to the center magnet (33) located at the center in the width direction of the magnet insertion part (31) and the end magnets (34), (34) located at the ends. ),
- the demagnetization can be prevented by making the coercive force of the center magnet (33) larger than that of the end magnets (34), (34).
- the magnetic flux density For the end magnets (34) and (34) that are difficult to demagnetize, the magnetic flux density
- each magnet (32) is composed of a central magnet (33) located at the center in the width direction of the magnet insertion part (31) and a magnet insertion part (31).
- the end magnets (34) and (34) are located at the end, and the magnetic flux density of the center magnet (33) is larger than the end magnets (34) and (34), and the end magnets (34) and (34)
- the coercive force of (34) may be larger than that of the central magnet (33).
- the magnet insertion portion (31) is formed from the center insertion portion (31a) located at the center in the circumferential direction of the yoke (26) and from both ends of the center insertion portion (31a). Continuous yoke
- the magnet insertion portion (31) is provided with a center insertion portion (31a) located at the center in the circumferential direction of the yoke (26), and the center insertion portion (31a).
- a center insertion portion (31a) located at the center in the circumferential direction of the yoke (26), and the center insertion portion (31a).
- the central magnet (3 3) force is embedded in the central insertion part (31 a), and the end magnets (34) and (34) are embedded in the magnetic flux barrier parts (31 b) and (31 b). It can also be.
- the magnetic flux density of the center magnet (33) is larger than that of the end magnets (34), (34), and the coercive force of the end magnets (34), (34) is higher than that of the center magnet (33).
- the same operation and effect can be obtained as in the case of large, and the magnetic flux of the magnet (3 2) in the rotor (2 5) becomes large, which is obtained from the repulsive force between this magnetic flux and the magnetic flux of the stator (2 1). It is possible to increase the magnet torque and, consequently, the motor torque of the electric motor (20).
- a plurality of permanent magnets (3 2) and (3 2) forming magnetic poles are arranged in the stator (2 1) in the magnet insertion portion (3 1) of the yoke (26) in the circumferential direction.
- each of the magnets (32) has a different magnetic flux density and coercive force along the yoke circumferential direction.
- the coercive force of the easily demagnetized portion is larger than that of the hardly demagnetized portion, and the magnetic flux density of the hardly demagnetized portion can be larger than that of the easily demagnetized portion.
- the magnetic flux density and the coercive force of each magnet (32) embedded in the rotor (25) vary along the yoke circumferential direction, and the coercive force of the easily demagnetized portion is reduced.
- the magnet in the portion that is easily demagnetized due to the reverse magnetic field due to the stator current is hardly demagnetized, and the demagnetization of the magnet (32) can be prevented.
- the magnetic flux density of the portion that is difficult to demagnetize is larger than that of the portion that is easy to demagnetize, so that the maximum torque and efficiency of the motor can be increased by this large magnetic flux density. Therefore, the present invention has the same operation and effect as described above. can do.
- each magnet (3 2) includes a magnet central portion (3 2a) located at the center in the width direction of the magnet insertion portion (31), and a magnet insertion portion (
- the magnetic flux density and coercive force differ between the magnet ends (3 2b) and (3 2b) located at the end of 3), and the coercive force at the center of the magnet (3 2a) is
- the magnetic flux density at the ends (32b) and (32b) is larger than that at the ends (32b) and (32b)
- the magnetic flux density at the ends (32b) and (32b) is larger than that at the center (32a) of the magnet, Is also good. In this case, the same operation and effect as described above can be obtained.
- each magnet (3 2) includes a magnet central portion (3 2a) located at the center in the width direction of the magnet insertion portion (31), and a magnet insertion portion (
- the magnetic flux density and coercive force are different between the magnet ends (32b) and (32b) located at the end of 31), and the magnetic flux density at the center of the magnet (32a) is It can be larger than (32b) and (32b), and the coercive force of the magnet ends (32b) and (32b) can be larger than that of the central part of the magnet (32a).
- the same operation and effect as described above can be obtained.
- the magnet insertion portion (31) has a center insertion portion (31a) located at the center in the circumferential direction of the yoke (26), and the center insertion portion (31). a) have magnetic flux barrier portions (31b) and (31b) extending substantially radially outward of the yoke (26) continuously from both ends of the yoke (26). It is possible to adopt a configuration embedded only in 31 a). Thus, the same operation and effect as described above can be obtained.
- the magnet insertion portion (31) has a center insertion portion (31a) located at the center in the circumferential direction of the yoke (26), and the center insertion portion (31).
- the magnetic flux barriers (3 1b) and (3 lb) extend substantially radially outward of the yoke (26) from both ends of 31 a).
- the center part (3 2a) of the magnet is in the center insertion part (3 1a) with respect to the insertion part (3 1), and the magnet ends (3 2b) and (3 2b) are the magnetic flux barrier part (3 1 b ), (3 1b).
- the magnetic flux density at the center portion (32a) of the magnet is larger than the magnet end portions (32b) and (32b), and the magnet end portions (32b) and (32b)
- the same operation and effect can be obtained as when the coercive force is larger than the central part of the magnet (32a).
- the rotor The magnetic flux of the magnet (32) in (25) increases, and the magnet torque obtained from the repulsive force of this magnetic flux and the magnetic flux of the stator (21), and in turn, the motor torque of the electric motor (20) is increased. be able to.
- any one of the permanent magnet type electric motors described above may be a compressor provided in the casing (1) in a state of being drivingly connected to the compression mechanism (3).
- FIG. 1 is a plan view showing a rotor yoke of a permanent magnet type electric motor according to Embodiment 1 of the present invention.
- FIG. 2 is a sectional view taken along the line II-II of FIG.
- FIG. 3 is an enlarged perspective view of the magnet.
- FIG. 4 is an enlarged sectional view of the compressor.
- FIG. 5 is a diagram corresponding to FIG. 3 showing a second embodiment of the present invention.
- FIG. 6 is a diagram corresponding to FIG. 1 showing the third embodiment of the present invention.
- FIG. 7 is a sectional view taken along line VII-VII of FIG.
- FIG. 8 is a diagram corresponding to FIG. 1 showing a fourth embodiment of the present invention.
- Fig. 4 shows a dome type compressor (C) equipped with a permanent magnet type electric motor according to the first embodiment of the present invention.
- (1) is a closed cylindrical casing (dome) extending in the vertical direction.
- a casing (1) At the upper end of the side wall of (1), a casing (1)
- a refrigerant discharge pipe (2) communicating between the inside and the outside is passed in an airtight manner with its inner end positioned at the center of the upper end of the casing (1). I have.
- a compression mechanism (3) that sucks and compresses the refrigerant gas and discharges it into the casing (1) is fitted in a lower part of the casing (1).
- the compression mechanism (3) is composed of two disk-shaped front and rear heads (4) and (5) that are arranged side by side in the vertical direction.
- a cylinder (7) consisting of an annular cylinder body (6) sandwiched between the front and rear heads (4) and (5) in an airtight manner is provided, and this cylinder (7) has a mounting plate. It is fixedly supported on the side wall of the casing (1) via (8). Further, a driving piston (10) (swing) made of a ring-shaped roller is disposed in the cylinder body (6) so as to be located between the front and the lya heads (4) and (5).
- a vertically extending crankshaft (11) extends through the center of the front and rear heads (4) and (5) in an airtight manner.
- This crankshaft (11) passes through the eccentric part (11a).
- the eccentric portion (11a) is rotatably inserted into the center hole of the oscillating piston (10) and is supported.
- the oscillating piston (10) is rotated by the rotation of the crankshaft (11).
- the crankshaft is sealed while lubricating oil is sealed between the outer circumference and the inner circumference of the cylinder body (6).
- a concave groove extending vertically is formed in a predetermined portion of the inner peripheral surface of the cylinder body (6), and the concave groove has a cylindrical shape having a blade fitting portion cut out in a diameter direction.
- a plate-like blade extending vertically is integrally protruded from the outer peripheral surface of the oscillating piston (10), and the tip of the blade is formed in the concave groove on the inner peripheral surface of the cylinder body (6).
- the sliding shaft is slidably fitted into the blade fitting portion of the drive shaft, and the blade allows the outer peripheral surface of the oscillating piston (10), the inner peripheral surface of the cylinder body (6), and the front and rear sides on both the upper and lower sides.
- An arc-shaped space surrounded by the heads (4) and (4) is divided into a working chamber (1 2) (compression chamber).
- the cylinder body (6) has an inlet (13) and a discharge port (not shown) on both sides of the groove (position of the blade), and the suction port (13) has a casing (13).
- the downstream end of the refrigerant suction pipe (15) penetrating the side wall is connected, and the upstream end of each refrigerant suction pipe (15) is connected to the accumulator (A).
- the discharge port is opened inside the casing (1), and a discharge valve (not shown) as a check valve composed of a reed valve is provided in the middle of the discharge port. ),
- the low pressure refrigerant gas in the accumulator (A) is transferred to the working chamber (1 2) via the refrigerant suction pipe (15) and the suction port (13).
- each lubricating oil discharge hole is connected to a lubricating oil passage passing through the axis of the crankshaft (11).
- the lower end of the lubricating oil passage is connected to the crankshaft (1). 1) is opened to the lower end surface of the casing.
- a permanent magnet type electric motor (20) is fitted around the upper part of the goossing (1) in the vicinity of the upper part of the compression mechanism (3) with a vertical axis of rotation, and this electric motor (20) It is drivingly connected to the compression mechanism (3) via the crankshaft (11) and drives it.
- the electric motor (20) includes a stator (2 1) and a rotor (25) rotatably arranged in the stator (2 1).
- the stator (21) has a plurality of annular thin plates made of electromagnetic steel sheets laminated and integrated in the axial direction (vertical direction of the casing (1)) and a plurality of recesses extending in the axial direction on the circumferential surface.
- a cylindrical stator yoke (22) (stator core) in which winding insertion portions (not shown) formed of grooves are equally spaced in the circumferential direction, and a stator yoke (22) It has, for example, three-phase stator windings (23), (23), ... wound around the winding insertion portion on the inner peripheral surface thereof, and the outer peripheral surface of the stator yoke (22) Is fixedly supported on the side wall of the casing (1) by spot welding.
- a rotating magnetic field is generated in the stator yoke (2 2). I have.
- the rotor (25) is a cylinder formed by laminating a number of circular thin sheets made of magnetic steel sheets as magnetic materials in the axial direction and integrating them by caulking.
- Rotor yoke (26) (rotor core) and both ends of the rotor yoke (26).
- the rotor yoke (26) and the end plates (2 7) and (2 7) have a plurality of end plates (2 7) and (2 7) disposed in the axial direction.
- each magnet insertion part (31), (31), ... penetrating in the axial direction of the rotor (25) are provided with the shaft through holes (29).
- each of the magnet insertion portions (31) has a central insertion portion (31a) located at the center in the circumferential direction of the rotor yoke (26) and a central insertion portion (31a). It has a pair of continuous magnetic flux barrier sections (3 1b) and (3 1b) at both ends.
- Both (3 1a) and the magnetic flux barrier sections (3 1b) have a rectangular cross section (slit shape).
- the central insertion portions (31a), (31a), ... of the four magnet insertion portions (31), (31), ... are approximately formed around the shaft hole (29).
- the permanent magnets (3 2) are fitted into and fixed to the central openings (31a), respectively, so as to form each side of the square.
- each magnetic flux barrier portion (3 lb) continuously extends from the end of the central insertion portion (31a) toward the outer side in the substantially radial direction of the rotor yoke (26). It extends substantially parallel to the magnetic flux barrier section (3 1b) of 1).
- the position of the central insertion portion (31a) of the magnet insertion portions (31), that is, the positions of the magnets (32) inside the magnet insertion portion (31) is determined by the center of the rotor yoke (26) and the outer peripheral surface.
- the yoke (26) is located at a position relatively distant from the outer peripheral surface. Then, the magnetic flux generated by the magnets (3 2), (3 2),... Forming the four poles and the magnetic flux of the four magnetic poles formed by the stator windings (2 3), (2 3),.
- the compression mechanism (3) is driven by rotating the rotor (25) by the action.
- each of the above-described magnet insertion portions (3 1) has a gap (space) without the magnet (3 2) inserted therein. To It is designed to reduce the amount and secure a passage for the refrigerant gas.
- (30) is a rivet through hole for passing the above-mentioned fastening rivet (28).
- (16) is a power supply connection part mounted on the outer surface of the upper wall of the casing (1), and a plurality of terminals (17), (17),. These terminals (17), (17), ... are connected to the ends of the stator windings (23), (23), ... of the motor (20).
- (18) is a support bracket for supporting the compressor, which is integrally fixed to the lower end of the casing (1).
- each magnet insertion part (31) and the position of each magnet (32) inside the magnet insertion part (31) are far away from the outer peripheral surface of the rotor yoke (26). Therefore, when one magnet, which is not divided, is inserted into the center insertion part (31a) of the magnet insertion part (31), both ends of the magnet are inserted.
- the portion is easily demagnetized by a reverse magnetic field (stator magnetic flux) due to the stator current flowing through each winding (2 3) of the stator (2 1), and the central portion has such characteristics that it is hard to be demagnetized by the above-mentioned reverse magnetic field.
- the three magnets (3 3), (34), and (3 4) are located on the side of the three magnets (3 3), (34), and (3 4) that are easily demagnetized by the reverse magnetic field caused by the stator current.
- the two end magnets (3 4) and (3 4) are assumed to have a larger coercive force than the central magnet (3 3) located on the hardly demagnetized side, and, conversely, are difficult to demagnetize.
- the central magnet (33) located on the side has a higher magnetic flux density than the magnets (34) and (34) located on the side where demagnetization is likely to occur.
- each magnet (3 2a) embedded in the center insertion portion (31a) of each magnet insertion portion (31) of the yoke (26) is used.
- ) Are relatively far away from the outer peripheral surface of the yoke (2 6), so that the opposite magnetic field caused by the current of the stator (2 1) of the motor (20) causes both ends of each magnet (3 2) to be closer than the center.
- Each magnet (3 2) is divided into one central magnet (3 3) and two end magnets (34) and (34), and the end magnet located on the side where demagnetization is easy to occur.
- both the end magnets (34) and (34) prevent demagnetization and the center magnet (33) secures the magnetic flux density, thereby reducing the material usage of each magnet (32). It is possible to improve the maximum torque and efficiency of the electric motor (20) by preventing demagnetization of the magnet (32) and suppressing reduction of the magnetic flux density while maintaining the cost reduction by reducing the cost.
- FIG. 5 shows a second embodiment of the present invention (in the following embodiments, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals and detailed description thereof is omitted).
- each magnet (3 2) is connected to the center magnet (3 3) located at the center in the width direction of the center insertion part (31 a) in the magnet insertion part (31), and the magnet insertion part (31) Of the central entrance (3 1 a)
- the end magnets (34), (34) located at the widthwise end are divided into three parts.
- the coercive force of the end magnets (34), (34) is larger than that of the center magnet (33), and the center magnet is
- the magnetic flux density of (3 3) is set to be larger than that of the end magnets (34), (34). Instead, the coercive force and magnetic flux density of one magnet (3 2) are changed in the width direction. It is different.
- each magnet (32) is not divided as in the first embodiment but is composed of one piece, but its magnetic flux density and coercive force are different. Are different along the circumferential direction (width direction) of the yoke (26). Specifically, each magnet (3 2) has one magnet central portion (3 2a) located at the center in the width direction of the central insertion portion (31 a) in the magnet insertion portion (31); The magnetic flux density and coercive force are different between the two magnet ends (32b) and (32b) located at both ends of the center insertion part (31a), and the magnet (32) is reduced.
- the magnetic flux density at the center of the magnet (32a) located in the hard-to-magnetize area is greater than the magnet ends (32b) and (32b) located in the easy-to-demagnetize area.
- the characteristics are changed so that the coercive force of the magnet ends (32b) and (32b), which are located in the easy part, is larger than that of the magnet center (32a), which is hard to demagnetize.
- FIGS. 6 and 7 show the third embodiment. Unlike the first embodiment, the coercive force of the center magnet (33) is increased, and the magnetic flux densities of the end magnets (34) and (34) are increased. It was done.
- Each of the magnets (3 2) is, as in the first embodiment, a central magnet (3 3) located at the center in the width direction of the central insertion portion (31a) in the magnet insertion portion (31).
- the end magnets (34) and (34) located at the end of the central insertion portion (31a) in the magnet insertion portion (31) are divided into three parts.
- the coercive force of the magnet (3 3) is larger than that of the end magnets (3 4) and (34), and the magnetic flux density of the end magnets (34) and (34) is The characteristics of both magnets (3 3) and (34) are different so that they are larger than (3 3). That is, in the rotor (25) in which each magnet (32) is located near the outer peripheral surface of the yoke (26) as in the third embodiment, the stator (2 1) each winding
- the center insertion part in the magnet insertion part (3 1) Due to the reverse magnetic field (stator magnetic flux) caused by the current in (23), the center of the magnet (32) in the width direction is more likely to be demagnetized than the end. Therefore, the center insertion part in the magnet insertion part (3 1)
- the coercive force of the central magnet (3 3), which is one of the central magnet (3 3) located at the center in the width direction of (3 1a) and the end magnets (3 4) and (34) located at the ends, is By making the magnets (34) and (34) larger, it is possible to prevent demagnetization as a whole of the magnet (32).
- the magnetic flux density of the end magnets (34) and (34), which are difficult to demagnetize, is larger than that of the center magnet (33).
- the magnetic flux density of these end magnets (34) and (34) makes the motor (20) Maximum torque and efficiency can be improved. Therefore, in this case, the same operation and effect as those of the first embodiment can be obtained.
- the coercive force and the magnetic flux density of one magnet (32) are measured in the circumferential direction of the yoke (26) (the width direction of the magnet (32)).
- the magnet ends (3 2b) are measured in the circumferential direction of the yoke (26) (the width direction of the magnet (32)).
- the magnetic flux density of (3 2b) is larger than that of the magnet center (32a) located at the part where demagnetization is easy, and the magnetic flux density of The characteristics may be changed so that the coercive force is greater than the magnet ends (32b) and (32b), which are difficult to demagnetize. In this case, the same operation and effect as those of the third embodiment can be obtained.
- FIG. 8 shows a fourth embodiment.
- the center magnet (33) 1 is provided substantially over the center insertion portion (31a) of each magnet insertion portion (31).
- End magnets (34) and (34) are fitted and fixed to substantially the entire portions (31b) and (31b), respectively.
- the magnetic flux barrier section (31b) is easily demagnetized by the reverse magnetic field caused by the stator current, and is located at the position.
- the two end magnets (34) and (34) at the position are easily demagnetized.
- the coercive force is larger than the central magnet (3 3) located on the side where demagnetization is difficult, and conversely, the central magnet (33) located on the side where demagnetization is difficult has a magnetic flux density of
- the magnets at both ends located on the side where demagnetization is likely to occur are larger than (34), (34).
- Other basic configurations are the same as those in the first embodiment.
- the center magnet (3 3a) and the magnetic flux barrier (3 1b) are almost completely connected to the center magnet (3 1a) and the end magnet (34 ) Explain the advantages of the respective structures.
- the motor torque of the electric motor (20) is determined by the magnetic flux generated by the magnet (32) of the rotor (25) and the winding of the stator (21). 2 3)
- the reluctance torque is obtained by matching the magnet tonolek, which is the repulsive force with the stator magnetic flux due to 3).
- the reluctance torque is determined by the relative position of the yoke (26) of the rotor (25) to the rotor (25) of the stator magnetic flux.
- the reluctance torque is the force from the rotor (25) to a position where the stator flux is most likely to flow. The larger, the larger.
- the magnet insertion part (31) has a central insertion part (31a) and a pair of magnetic flux barrier parts (31b) and (31) connected to both ends of the central insertion part (31a).
- b) (Fig. 1, Fig. 6 or Fig. 8), there is a large difference in the ease with which the stator magnetic flux passes according to the change in the position of the rotor (25). Rotor toward a position where magnetic flux easily passes
- the reluctance torque for rotating (25) is greater than the structure of (B) above. This is the reason for providing the magnetic flux barrier section (31b).
- the relative magnetic permeability as a value indicating the ease of passage of the magnetic flux is as follows. Assuming that air is 1.00, the core (yoke) is about 1,000, while the magnet is about 1.05, Magnets have a relative permeability equal to that of air compared to cores, and have the property of not allowing magnetic flux to pass through. Therefore, for the stator magnetic flux generated by passing the stator current, the magnet insertion part (31) is the same as the air gap (air) regardless of the center insertion part (31a) and the magnetic flux barrier part (31b). The magnitude of the reluctance torque is determined by the magnet insertion part (3 1) (center insertion part). (3 1a) and the magnetic flux barrier (3 1b)) are not affected by the presence or absence of a magnet.
- control is performed in accordance with the operating conditions so that the motor torque becomes as large as possible.
- the center magnet (33) 1 is inserted into the center insertion portion (31a) of the magnet insertion portion (31), and the end magnet (34) is attached to each magnetic flux barrier portion (31b). ) Are inserted, and the magnets (3 3) and (3 3) are inserted only into the central insertion part (3 1a) of the magnet insertion part (3 1).
- Example 4 When the magnetic flux of the above magnet is compared with the structure of Example 1 (see FIG. 1) in which (34) is inserted, the structure of Example 4 has a larger magnetic flux than the structure of Example 1. Therefore, the magnet torque also increases. Therefore, in the fourth embodiment, the effect that the motor torque can be increased as compared with the first embodiment and the like is obtained.
- one magnet (3 2) having a sectional shape corresponding to the magnet insertion portion (3 1) is inserted into the center insertion portion of the magnet insertion portion (3 1).
- (31a) or the magnetic flux barriers (31b) and (31b), and the coercive force and magnetic flux density of one of the magnets (32) are measured in the circumferential direction of the yoke (26).
- the magnetic flux at the center of the magnet (3 2a) is located at the position where the magnet (3 2) is hardly demagnetized because it is fitted into the central opening (3 1a).
- the density is larger than that of the magnet ends (3 2b) and (3 2b) which are inserted into the magnetic flux barrier sections (3 1b) and (3 1b) and are located at the parts where demagnetization is easy. Even if the characteristics are changed so that the coercive force of the magnet ends (32b) and (32b) located in the part that is easily demagnetized is larger than the central part (32a) of the magnet that is difficult to demagnetize. Good.
- the magnet (3 2) is connected to the center (3 3) and (3 2a) with the end
- (34) and (3 2b) are divided into two, but they may be divided into two or more than four, and the coercive force of the part located on the side where demagnetization is easy
- the magnetic flux density of the portion located on the side where the demagnetization is difficult to be larger than the located portion may be higher than the portion located on the side where the demagnetization is easy.
- each magnet (32) is demagnetized by a reverse magnetic field due to the stator current flowing through the stator winding (23).
- the present invention can be applied, and the coercive force and the magnetic flux density of the magnet may be divided into a portion that is easily demagnetized by the heating and a portion that is hardly demagnetized.
- the present invention is applied to the electric motor (20) used as the drive motor of the compressor (C).
- the present invention is not limited to the permanent magnet used for applications other than the compressor. It is needless to say that the present invention can be applied to a type motor.
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03707160.2A EP1487084B1 (en) | 2002-03-20 | 2003-02-27 | Permanent magnet type motor and compressor comprising it |
BR0303575-1A BR0303575A (pt) | 2002-03-20 | 2003-02-27 | Motor elétrico do tipo de imã permanente e compressor que utiliza o mesmo |
US10/478,097 US6849981B2 (en) | 2002-03-20 | 2003-02-27 | Permanent magnet type motor and compressor comprising it |
KR1020037017020A KR100567130B1 (ko) | 2002-03-20 | 2003-02-27 | 영구자석형 전동기 및 이를 이용한 압축기 |
AU2003211194A AU2003211194B2 (en) | 2002-03-20 | 2003-02-27 | Permanent magnet type motor and compressor comprising it |
JP2003577400A JP4033132B2 (ja) | 2002-03-20 | 2003-02-27 | 永久磁石型電動機及びそれを用いた圧縮機 |
ES03707160.2T ES2518928T3 (es) | 2002-03-20 | 2003-02-27 | Motor del tipo de imanes permanentes y compresor que comprende el mismo |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-77920 | 2002-03-20 | ||
JP2002077920 | 2002-03-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003079516A1 true WO2003079516A1 (fr) | 2003-09-25 |
Family
ID=28035547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/002281 WO2003079516A1 (fr) | 2002-03-20 | 2003-02-27 | Moteur de type a aimants permanents et compresseur dote de ce moteur |
Country Status (10)
Country | Link |
---|---|
US (1) | US6849981B2 (ja) |
EP (1) | EP1487084B1 (ja) |
JP (1) | JP4033132B2 (ja) |
KR (1) | KR100567130B1 (ja) |
CN (1) | CN1287503C (ja) |
BR (1) | BR0303575A (ja) |
ES (1) | ES2518928T3 (ja) |
MY (1) | MY122967A (ja) |
TW (1) | TWI274457B (ja) |
WO (1) | WO2003079516A1 (ja) |
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JP2009100622A (ja) * | 2007-10-19 | 2009-05-07 | Mitsubishi Electric Corp | 永久磁石モータ |
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MY122967A (en) | 2006-05-31 |
CN1287503C (zh) | 2006-11-29 |
US20040145263A1 (en) | 2004-07-29 |
ES2518928T3 (es) | 2014-11-05 |
EP1487084A4 (en) | 2006-06-28 |
US6849981B2 (en) | 2005-02-01 |
TW200401492A (en) | 2004-01-16 |
AU2003211194A1 (en) | 2003-09-29 |
KR100567130B1 (ko) | 2006-03-31 |
KR20040012989A (ko) | 2004-02-11 |
TWI274457B (en) | 2007-02-21 |
EP1487084A1 (en) | 2004-12-15 |
JPWO2003079516A1 (ja) | 2005-07-21 |
BR0303575A (pt) | 2004-04-20 |
JP4033132B2 (ja) | 2008-01-16 |
CN1516915A (zh) | 2004-07-28 |
EP1487084B1 (en) | 2014-08-06 |
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