Rotor unit disk of direct-drive type permanent magnet-embedded reluctance synchronous motor

Abstract

The present invention provides a rotor unit disk of a direct-drive type permanent magnet-embedded reluctance synchronous motor, the unit disk (1) forming a rotor by being stacked in a state in which a shaft hole (2) is formed in each central portion, and comprising: a first embedded barrier hole (110) in which a first embedded portion (111) and each of first-1 and first-2 barrier portions (115, 117) are formed; a second embedded barrier hole (120) in which a second embedded portion (121) and each of second-1 and second-2 barrier portions (125, 127) are formed; a third embedded barrier hole (130) in which a third embedded portion (131) and each of third-1 and third-2 barrier portions (135, 137) are formed; first-1 and first-2 conductor embedded holes (211, 215), second-1 and second-2 conductor embedded holes (221, 225), and a third conductor embedded hole (230); first, second and third permanent magnet bars (310, 320, 330) embedded in each of the first-1 to third conductor embedded holes (211, 215, 221, 225, 230); and first, second, and third conductor bars (410, 420, 430) embedded in each of first to third embedded holes (210, 220, 230).

Description

Rotor unit disk of a permanent magnet embedded reluctance synchronous motor with direct drive

[0001] The present invention relates to a rotor unit disk, and more specifically, to a rotor unit disk of a permanent magnet embedded reluctance synchronous motor of a direct drive type, which enables direct drive even when there is a problem with an inverter, and can fundamentally prevent the phenomenon of magnetic flux leakage during the operation of the rotor, thereby improving the efficiency and power factor of the motor, and further, can increase the starting torque required during the initial start-up process of the motor and minimize the cogging torque that interferes with the start-up of the motor.

[0002] A line-start permanent magnet synchronous motor is a type of AC motor that is driven by torque generated by the interaction of a secondary current generated by a voltage induced by a conducting bar embedded in the rotor and a magnetic flux generated by a coil winding of a stator. It is characterized by operating at the rotating magnetic field speed of the stator as the magnetic flux of a permanent magnet separately embedded in the rotor and the magnetic flux generated in the stator are mutually synchronized.

[0003] In the case of these line-driven permanent magnet embedded synchronous motors, since they are highly dependent on the magnetic flux of the permanent magnets embedded in the rotor, more permanent magnets need to be embedded to increase the torque of the motor. However, as the number of embedded permanent magnets increases, the manufacturing cost of the motor increases, which has the disadvantage of increasing. Meanwhile, other examples of synchronous motors used throughout the industry include the synchronous reluctance motor (SynRM) and the permanent magnet assisted synchronous reluctance motor (PMA SynRM).

[0004] These synchronous motors have in common that they form multiple magnetic flux barriers on the unit disks forming the rotor, and rotate the rotor with the reluctance torque generated by the difference in magnetic resistance in the direction toward the magnetic flux barriers (q axis) and the direction between the magnetic flux barriers (d axis) when the rotor is started. In particular, in the case of the PMA synchronous reluctance motor shown as an example in Fig. 5, if permanent magnets are embedded in the rotor itself, the inductance in the direction toward the magnetic flux barriers can be reduced, so that the torque density and power factor can be expected to be improved.

[0005] However, unlike line-driven permanent magnet embedded synchronous motors, these synchronous motors often do not have an inverter built into the motor itself. Even for motors equipped with an inverter, the motor itself has the disadvantage of not operating if the inverter fails. To address these shortcomings of conventional synchronous motors, Korean Patent No. 2547221, as illustrated in FIG. 6, was proposed.

[0006] This technology proposes a configuration in which a plurality of first and second embedded barrier holes (110, 120) are formed as left and right pairs in a symmetrical structure on each unit disc of the rotor as shown in the drawing, and first and second conductor embedded holes (131, 135) are formed at points spaced apart from one end and the other end of each of the first and second embedded barrier holes (110, 120) by a certain distance, and then first and second permanent magnet bars (not shown) are embedded in each of the first and second embedded barrier holes (110, 120), and a conductor bar (not shown) is embedded in each of the first and second conductor embedded holes (131, 135).

[0007] In this case, not only is direct driving possible even if there is a problem with the inverter, like a line-start permanent magnet embedded synchronous motor, but the main torque can be generated at synchronous speed with a magnetic resistance component like a reluctance motor through the first and second barrier sections (115, 125) forming the first and second embedded barrier holes (110, 120), respectively, and further, the power factor can be improved by the first and second permanent magnet bars embedded in the first and second embedded barrier holes (110, 120), respectively, so that it is expected to have the advantage of evenly demonstrating the advantages of the conventional line-start permanent magnet embedded synchronous motor, synchronous reluctance motor, and PMA synchronous reluctance motor, respectively.

[0008] However, this technology may cause a decrease in motor efficiency due to a decrease in rotational torque caused by magnetic flux leakage as a gap △t is formed between the embedded barrier holes where the permanent magnet bars are embedded. In addition, since this technology embeds the permanent magnet bars in the rotor, like a line-start permanent magnet embedded synchronous motor, it has certain limitations in minimizing the cogging torque that interferes with the rotational power of the rotor during the initial startup process of the motor.

[0009] The present invention has been proposed to improve the problems of the prior art, and the purpose of the present invention is to provide a rotor unit disk of a direct-drive permanent magnet reluctance synchronous motor, which can equally exert the advantages of a conventional line-start permanent magnet embedded synchronous motor, a synchronous reluctance motor, and a PMA synchronous reluctance motor, while minimizing magnetic flux leakage to increase the efficiency and power factor of the motor, and also minimize cogging torque that interferes with the rotational power of the rotor during the initial starting process of the motor.

[0010] In order to achieve this purpose, the present invention is a rotor comprising a plurality of unit discs (1) formed in a state where a shaft hole (2) is formed in each central portion thereof and formed on the unit discs (1) so as to be symmetrical with respect to the central axis of the shaft hole (1), and a first insertion portion (111) is formed in each central portion thereof, in which a pair of first-1, 1-2 fixing ends (112, 113) are provided on the left and right sides thereof, and first-1, 1-2 barrier portions (115, 117) are formed on the left and right sides of each of the first insertion portions (111) respectively, which are inclined counterclockwise at θ1 (90°<θ1<180°) and clockwise at θ2 (90°<θ1<180°) with respect to the first insertion portion (111) and are connected to the first insertion portion (111). A first embedded barrier hole (110); a plurality of second embedded portions (121) formed on a unit plate (1) at regular intervals vertically above the first embedded barrier hole (110) and symmetrical with respect to the central axis of the shaft hole (1), each of which is provided with a pair of second-1, 2-2 fixing ends (122, 123) on the left and right sides, and a second embedded barrier hole (120) formed with second-1, 2-2 barrier portions (125, 127) each that are connected to the second embedded portion (121) on the left and right sides of each of the second embedded portions (121); A third embedded portion (131) is formed in which at least one or more are formed on the unit plate (1) between the first embedded barrier hole (110) and the second embedded barrier hole (120) and are symmetrical with respect to the central axis of the shaft hole (1), and a pair of 3-1, 3-2 fixing ends (132, 133) are provided on the left and right sides of each of the central portions of the third embedded portion (131), and a third embedded barrier hole (130) is formed in which 3-1, 3-2 barrier portions (135, 137) are respectively inclined counterclockwise at θ1 (90°<θ1<180°) and clockwise at θ2 (90°<θ1<180°) with respect to the third embedded portion (131) and are connected to the third embedded portion (131).1-1, 1-2 conductor embedding holes (211, 215) formed on the unit plate (1) at the same angle as the 1-1, 1-2 barrier portions (115, 117), respectively, and spaced apart from one end of the 1-1 barrier portion (115) of each 1-1 embedding barrier hole (110) and the other end of the 1-2 barrier portion (117) by a certain distance; 2-1, 2-2 conductor embedding holes (221, 225) formed on the unit plate (1) at the same angle as the 1-1, 1-2 conductor embedding holes (211, 215), respectively, and spaced apart from one end of the 1-1 barrier portion (125) of each 2-2 embedding barrier hole (120), respectively, and spaced apart from one end of the 2-2 barrier portion (127) by a certain distance; A third conductor embedding hole (230) having an elongated oval shape and formed in a unit disk (1) at a point between the 2-1 and 2-2 conductor embedding holes (221, 225) at regular intervals from each other, each having a central axis radially arranged toward the center of the shaft hole (2); a first permanent magnet bar (310) embedded between the 1-1 and 1-2 fixed ends (112, 113), a second permanent magnet bar (320) embedded between the 2-1 and 2-2 fixed ends (122, 123), and a third permanent magnet bar (330) embedded between the 3-1 and 3-2 fixed ends (132, 133); There is a technical feature including a first conductor bar (410) embedded in each of the first conductor embedding holes (210), a second conductor bar (420) embedded in each of the second conductor embedding holes (220), and a third conductor bar (430) embedded in each of the third conductor embedding holes (230);

[0011] Each of the 3-1 and 3-2 barrier sections (135, 137) of the above 3rd embedded barrier hole (130) has a two-part structure, and each of the 3-1 barrier sections (135) is connected to the 3rd embedded section (131) and horizontally extends to one side of the 3-1 fixed end (132), and each of the 3-1 extended barrier sections (134) is connected to one side of the 3-1 extended barrier section (134) and horizontally extends to one side of the 3-1 fixed end (132), and each of the 3-1 inclined barrier sections (136) is connected to one side of the 3-1 extended barrier section (134) and horizontally extends to the other side of the 1-1 and 1-2 conductor embedded holes (211, 221) by a certain distance, and each of the 3-2 barrier sections (137) is connected to the 3rd embedded section (131) and horizontally extends to the other side of the 3-2 fixed end (133). It can be formed by a 3-2 extension barrier section (138) and a 3-2 inclined barrier section (139) spaced apart from the other end of the 3-2 extension barrier section (138) by a certain distance and inclined at θ1 in the clockwise direction in the same manner as the 1-2 and 2-2 conductor insertion holes (215, 225).

[0012] At this time, a 3-1 bend (136') that is horizontally the same as the 3-1 extension barrier (134) is formed at the other end of the 3-1 slope barrier (136), and a 3-2 bend (139') that is horizontally the same as the 3-2 extension barrier (136) is formed at one end of the 3-2 slope barrier (139); Each of the 1-1 and 1-2 barrier sections (115, 117) of the above-mentioned first embedded barrier hole (110) has a two-part structure, and each of the 1-1 barrier sections (115) is connected to the first embedded section (111) and is formed of a 1-1 extension barrier section (114) that extends horizontally to one side of the 1-1 fixed end (112) and a 1-1 inclined barrier section (116) that is spaced apart from one end of the 1-1 extension barrier section (114) and is inclined at an angle of θ1 in the counterclockwise direction, and a 1-1 bent section (116') that is horizontally the same as the 1-1 extension barrier section (116) is formed at the other end of the 1-1 inclined barrier section (116), and each of the 1-2 barrier sections (117) is It is composed of a first-second extension wall portion (118) that is connected to the first insertion portion (111) and extends horizontally to the other side of the first-second fixed end (113), and a first-second inclined wall portion (119) that is spaced apart from the other end of the first-second extension wall portion (118) by a certain distance and inclined at an angle of θ1 in the clockwise direction. However, a first-second bent portion (119') that is horizontally parallel to the first-second extension wall portion (118) may be formed at one end of the first-second inclined wall portion (119).

[0013] In addition, at this time, each of the 1-1 and 1-2 barrier portions (115, 117) of the first embedded barrier hole (110) has a two-part structure, and each of the 1-1 barrier portions (115) is connected to the first embedded portion (111) and horizontally extends to one side of the 1-1 fixed end (112) and is formed by a 1-1 extension barrier portion (114) and a 3-1 inclined barrier portion (116) that is spaced apart from one end of the 1-1 extension barrier portion (114) by a certain distance and is inclined counterclockwise by θ1 in the same way as the 1-1 conductor embedded hole (211), and each of the 1-2 barrier portions (117) is connected to the first embedded portion (111) and horizontally extends to the other side of the 1-2 fixed end (113) and is formed by a 1-2 extended barrier portion (118). The first-second inclined wall portion (119) is formed by being spaced apart from the other end of the first-second extension wall portion (118) by a certain distance and inclined at θ1 in the clockwise direction in the same manner as the first-second conductor embedding hole (215); each of the first, second, and third embedding portions (111, 121, 131) has its central portion separated left and right by an interval of △t, and the first-first, 1-2 embedding portions (111′, 111″), the second-first, 2-2 embedding portions (121′, 121″), and the third-first, 3-2 embedding portions (131′, 131″) are formed; In each of the above 1-1, 1-2 embedded portions (111′, 111″), 2-1, 2-2 embedded portions (121′, 121″), and 3-1, 3-2 embedded portions (131′, 131″), 1-1, 1-2 permanent magnet bars (311, 315), 2-1, 2-2 permanent magnet bars (321, 325), and 3-1, 3-2 permanent magnet bars (331, 335) are embedded; A second-first bend portion inclined at the same angle as the second-first conductor insertion hole (221) may be formed at one end of the second-first barrier portion (125), and a second-second bend portion inclined at the same angle as the second-second conductor insertion hole (225) may be formed at the other end of the second-second barrier portion (127).

[0014] The present invention basically enables direct drive even when there is a problem with the inverter by embedding a conductor bar in the rotor and introducing a barrier around the permanent magnet bar, and at the same time, it is possible to generate the main torque at synchronous speed with the magnetic resistance component and improve the power factor by the permanent magnet bar.

[0015] In addition, the present invention can improve the efficiency and power factor of the motor by fundamentally preventing the phenomenon of magnetic flux leakage during the operation of the rotor, and can increase the starting torque required during the initial starting process of the motor and minimize the cogging torque that hinders the starting of the motor through the configuration of multiple conductor bars and barriers.

[0016] Figure 1a is a schematic diagram of a rotor unit disk of a synchronous motor according to the present invention.

[0017] Figure 1b is a schematic diagram showing a case where a conductor bar and a permanent magnet are each embedded in Figure 1a.

[0018] Fig. 2a is another configuration diagram of a rotor unit disk of a synchronous motor according to the present invention.

[0019] Figure 2b is a schematic diagram showing a case where each of the conductor bar and the permanent magnet is embedded in Figure 2a.

[0020] Fig. 3 is another configuration diagram of a rotor unit disk of a synchronous motor according to the present invention.

[0021] Fig. 4a is another configuration diagram of a rotor unit disk of a synchronous motor according to the present invention.

[0022] Figure 4b is a schematic diagram showing a case where each of the conductor bar and the permanent magnet is embedded in Figure 4a.

[0023] Figure 5 is a schematic diagram of a conventional synchronous reluctance motor.

[0024] Figure 6 is a schematic diagram of a unit disk forming the rotor of a conventional synchronous motor.

[0025] A preferred embodiment of the present invention will be described in detail with reference to the attached drawings as follows. In describing the embodiment of the present invention, a detailed description of matters that are not directly related to the technical features of the present invention or are obvious to a person having ordinary skill in the technical field to which the present invention pertains will be omitted.

[0026] The present invention is a unit disk forming a rotor of a permanent magnet embedded magnetic reluctance synchronous motor of a direct drive type, and is characterized by including a shaft hole (2), first, second, and third embedded barrier holes (110, 120, 130), first and second conductor embedded holes and third conductor embedded holes (230), first, second, and third permanent magnet bars (310, 320, 330), and first, second, and third conductor bars (410, 420, 430), as shown in FIGS. 1a and 1b, respectively. Each of these components forming the unit disk (1) will be examined in detail.

[0027] In the present invention, the rotor is located inside a stator (not shown), and a plurality of slots may be formed on the inner surface of the stator, and coils are wound in adjacent slots. The specific configuration related to this is widely known in the relevant industry, so a detailed description thereof is omitted.

[0028] A plurality of unit discs (1) are stacked to form a rotor, and are made of a metal plate having a certain thickness and diameter, and a shaft hole (2) is formed on the central axis thereof. The material of the unit disc (1) can be any of the materials commonly used in the relevant industry.

[0029] The first embedded barrier hole (110) is formed adjacent to the corner portion of the shaft hole (1) and is composed of a plurality of holes that are symmetrical vertically with respect to the central axis of the shaft hole (1). In each of the first embedded barrier holes (110), a first embedded portion (111) and first-1 and first-2 barrier portions (115, 117) are formed.

[0030] The first embedded portion (111) is formed in the central portion of each of the first embedded barrier holes (110), and a pair of first-1, 1-2 fixing ends (112, 113) on the left and right are provided. The first embedded portion (111) is a portion where the first permanent magnet bar (310), which will be described later, is embedded. Each of the first-1, 1-2 fixing ends (112, 113) maintains a stable embedded state of the first permanent magnet bar (310), thereby fundamentally preventing the space of the first embedded portion (111) from being damaged by the first permanent magnet bar (310).

[0031] Each of the first-1 and 1-2 barrier sections (115, 117) is connected to the first embedded section (111) and is formed on the left and right sides of each of the first embedded sections (111), and has the characteristic of being formed while being inclined counterclockwise at θ1 (90°<θ1<180°) and clockwise at θ2 (90°<θ1<180°) with respect to the first embedded section (111). Each of the first-1 and 1-2 barrier sections (115, 117) functions as a magnetic flux barrier, and the drawing discloses a case where the first-1 and 1-2 barrier sections (115, 117) are θ1, 2 = 140°.

[0032] The second embedded barrier hole (120) is formed at a certain interval vertically above the first embedded barrier hole (110) and is formed in a plurality of pieces symmetrically with respect to the central axis of the shaft hole (1). In each of the second embedded barrier holes (120), a second embedded portion (121) and 2-1 and 2-2 barrier portions (125, 127) are formed.

[0033] The second embedded portion (121) is formed in the central portion of each of the second embedded barrier holes (120), and a pair of second-1, 2-2 fixing ends (122, 112) on the left and right are provided. Each of the second-1, 2-2 barrier ends (125, 127) is connected to the second embedded portion (121) and is formed on the left and right portions of each of the second embedded portions (121). The second embedded portion (121) is a portion where the second permanent magnet bar (320) described later is embedded, and the second-1, 2-2 fixing ends (122, 112) perform the same function as the first-1, 1-2 fixing ends (112, 113) described above.

[0034] The third embedded barrier hole (130) is formed at a point between the first embedded barrier hole (110) and the second embedded barrier hole (120), and may be formed of at least one or more symmetrical holes with respect to the central axis of the shaft hole (1). In each of the third embedded barrier holes (130), a third embedded portion (131) and third-1 and third-2 barrier portions (135, 137) are formed, respectively.

[0035] The third embedding portion (131) is formed in the central portion of each of the third embedding barrier holes (130), and a pair of third-1, 3-2 fixing ends (132, 133) are provided on the left and right sides in the central portion. Each of the third-1, 3-2 barrier portions (135, 137) is connected to the third embedding portion (131) similarly to each of the aforementioned first-1, 1-2 barrier portions (115, 117), and is formed to be inclined counterclockwise at θ1 (90°<θ1<180°) and clockwise at θ2 (90°<θ1<180°) with respect to the third embedding portion (131) on the left and right sides, respectively.

[0036] The first-1 and 1-2 barrier sections (115, 117) of the first insertion barrier hole (110) each function as a magnetic flux barrier, and examples are shown in the drawing in which the first-1 and 1-2 barrier sections (115, 117) each are inclined at the same angle as the first-1 and 1-2 barrier sections (115, 117).

[0037] The first conductor embedding hole is a portion where the first conductor bar (410) described later is embedded, and is composed of the 1-1 and 1-2 conductor embedding holes (211, 215). At this time, each of the 1-1 and 1-2 conductor embedding holes (211, 215) is inclined at the same angle as each of the 1-1 and 1-2 barrier sections (115, 117), and is formed at a set distance from one end of the 1-1 barrier section (115) and the other end of the 1-2 barrier section (117) of each of the first embedding barrier holes (110).

[0038] The second conductor embedding hole is a portion where the second conductor bar (420) described later is embedded, and is composed of second-1 and second-2 conductor embedding holes (221, 225) similar to the first conductor embedding hole. Each of the second-1 and second-2 conductor embedding holes (221, 225) is inclined at the same angle as each of the first-1 and second-2 conductor embedding holes (211, 215), and is formed on the unit plate (1) at a set distance from one end of the first-1 barrier portion (125) and the other end of the second-2 barrier portion (127) of each of the second embedding barrier holes (120).

[0039] The third conductor embedding hole (230) is formed in multiple pieces spaced apart from each other at a certain interval between the 2-1 and 2-2 conductor embedding holes (221, 225). At this time, each of the third conductor embedding holes (230) has an elongated oval shape as shown in the drawing, and has the characteristic of being arranged radially with each central axis pointing toward the center of the shaft hole (2).

[0040] The first permanent magnet bar (310) is embedded between the first-1 and 1-2 fixed ends (112, 113), the second permanent magnet bar (320) is embedded between the second-1 and 2-2 fixed ends (122, 123), and the third permanent magnet bar (330) is embedded between the third-1 and 3-2 fixed ends (132, 133).

[0041] The first conductor bar (410) is embedded in each of the first conductor embedding holes (210), the second conductor bar (420) is embedded in each of the second conductor embedding holes (220), and the third conductor bar (430) is embedded in each of the third conductor embedding holes (230). Fig. 1b shows the upper surface of the rotor on which the unit plates (1) are stacked, and it is obvious that each of the permanent magnet bar and the conductor bar must be embedded in a state in which the unit plates (1) are stacked.

[0042] In this way, when the present invention forms the first-1, 1-2 conductor embedding holes (211, 215) at the same angle as the first-1, 1-2 barrier sections (115, 117), and the second-1, 2-2 conductor embedding holes (221, 225) formed at a certain distance from the left and right ends of the second-1, 2-2 barrier sections (125, 127) at the same angle as the first-1, 1-2 conductor embedding holes (211, 215), the spacing between the embedding holes and the magnetic flux flowing between the conductor embedding holes can be maintained in a very uniform state.

[0043] In addition, conventional general LS PM synchronous motors have a structure in which slots formed radially along the inner surface of the stator face each other with conductor-embedding holes, but the present invention configures each of the first and second conductor-embedding holes to be deflected at a certain angle with respect to the slots of the stator, so that even if the inverter provided in the motor breaks down during long-term operation, direct-start operation is possible like an induction motor.

[0044] Meanwhile, the present invention is similar to an LS PM synchronous motor in that it can be started by direct power by embedding the first and second conductor bars in the first-1, 1-2, 2-1, and 2-2 conductor embedding holes of the rotor, respectively. However, the present invention is similar to a synchronous reluctance motor in that the main element that generates torque at synchronous speed is not the magnetic component of a permanent magnet like an LS PM synchronous motor, but the reluctance component resulting from the configuration of the first-1, 1-2, 2-1, and 2-2 barrier sections formed in the rotor.

[0045] And, the present invention is similar to a PMA synchronous reluctance motor in that it has a configuration in which first and second permanent magnet bars are embedded in the first and second embedded portions of the first and second embedded barrier holes of the rotor, respectively. However, in the present invention, each of the first and second permanent magnet bars has the main purpose of improving the power factor and torque acts as a secondary function, so it is different from a PMA synchronous reluctance motor in which the main torque is generated by the permanent magnet, and even if smaller permanent magnets are embedded, the intended purpose can be sufficiently achieved.

[0046] In addition, the present invention fundamentally prevents the phenomenon of magnetic flux leakage during the operation of the rotor by forming the first, second, and third embedded barrier holes (110, 120, 130), in which the first, second, and third permanent magnet bars (310, 320, 330) are each embedded, as an integral structure without forming a gap △t, unlike in FIG. 6. In this way, when magnetic flux leakage is prevented, the rotational torque also increases as the magnetic flux flowing in the rotor increases. This increase in the rotational torque can reduce the amount of current flowing along the windings of the stator, thereby improving the efficiency and power factor of the motor.

[0047] Meanwhile, the present invention embeds a permanent magnet bar in the rotor to improve the power factor of the motor. In this case, the rotor itself, located inside the stator made of iron, generates a magnetic force, which causes cogging torque that hinders the rotational force of the rotor when the motor is initially started. Therefore, in order for the rotor to overcome this cogging torque and reach the synchronous speed, a design that increases the starting torque of the motor while reducing the starting current flowing in the stator winding is essential.

[0048] To this end, the present invention proposes a method of forming a plurality of third conductor embedding holes (230) in the upper portions of the second embedded barrier holes (120) in which the second permanent magnet bars (320) are embedded, embedding a third conductor bar (430) in each of these third conductor embedding holes (230), and embedding a first conductor bar (410) and a second conductor bar (42) in each of the first-1, 1-2 conductor embedding holes (211, 215) and the second-1, 2-2 conductor embedding holes (221, 225), but not providing a separate conductor bar between the first conductor bar (410) and the second conductor bar (42), and forming a barrier such as the third-1, 3-2 barrier portions (135, 137).

[0049] In this way, by arranging multiple third conductor bars at a certain distance from each other and providing a barrier section between the first and second conductor bars, the resistance of the conductor bars in the rotor can be increased, thereby increasing the starting torque required for the initial start of the motor, while minimizing the cogging torque that hinders the start of the motor. To this end, it is preferable to embed the third conductor bar in a diamond-shaped hole, as shown in the drawing, with a wider upper portion and a narrower lower portion.

[0050] Meanwhile, the present invention does not exclude the case where each of the 3-1 and 3-2 barrier sections (135, 137) of the 3rd embedded barrier hole (130) is formed into a two-part structure, as shown in FIGS. 2a and 2b, respectively. That is, each of the 3-1 and 3-2 barrier sections (135, 137) is formed of a 3-1 extension barrier section (134), a 3-1 inclined barrier section (136), and a 3-2 extension barrier section (138) and a 3-2 inclined barrier section (139).

[0051] Among these, the 3-1 extension barrier section (134) is connected to the 3rd embedded section (131) and horizontally extends to one side of the 3-1 fixed end (132), and the 3-2 extension barrier section (138) is connected to the 3rd embedded section (131) and horizontally extends to the other side of the 3-2 fixed end (133).

[0052] In addition, the 3-1 inclined wall portion (136) is formed at a certain distance from one end of the 3-1 extended wall portion (134) and is inclined at an angle of θ1 in the counterclockwise direction, similar to each of the 1-1 and 1-2 conductor embedding holes (211, 221), and the 3-2 inclined wall portion (139) is formed at a certain distance from the other end of the 3-2 extended wall portion (138) and is inclined at an angle of θ1 in the clockwise direction, similar to each of the 2-1 and 2-2 conductor embedding holes (215, 225).

[0053] As shown in Fig. 1a, a plurality of third conductor bars (430) are arranged at a constant interval from each other, and a barrier section is provided between the first and second conductor bars (410, 420), and as shown in Fig. 2a, each of the third-1 and 3-2 barrier sections (135, 137) of the three-embedded barrier hole (130) is divided into two, and among the third-1 and 3-2 barrier sections (135, 137), each of the third-1 and 3-2 inclined barrier sections (136, 139) is formed at the same angle as each of the first-1 and 1-2 conductor embedding holes (211, 221) and the second-1 and 2-2 conductor embedding holes (215, 225), so that the starting torque required for the initial start of the motor can be further increased, while at the same time, the cogging torque can be further minimized.

[0054] Based on the configuration of Fig. 2a, more detailed configurations that can increase the starting torque while reducing the cogging torque during the initial startup of the motor are shown in Figs. 3a and 3b, respectively. Each of these will be examined.

[0055] First, in each of FIGS. 3a and 3b, in the basic configuration of each of FIGS. 2a and 2b, a 3-1 bend portion (136') is formed at the other end of the 3-1 inclined wall portion (136) so as to be level with the 3-1 extended wall portion (134), a 3-2 bend portion (139') is formed at one end of the 3-2 inclined wall portion (139) so as to be level with the 3-2 extended wall portion (136), and each of the 1-1 and 1-2 barrier portions (115, 117) of the 1st embedded barrier hole (110) has a two-part structure.

[0056] At this time, each of the first-first barrier sections (115) may be composed of a first-first extension barrier section (114) and a first-first inclined barrier section (116). The first-first extension barrier section (114) is connected to the first embedded section (111) and extends horizontally to one side of the first-first fixed end (112). The first-first inclined barrier section (116) is formed by being spaced apart from one end of the first-first extension barrier section (114) by a certain distance and inclined counterclockwise by θ1, and has the characteristic of having a first-first bent section (116') formed at the other end that is horizontally parallel to the first-first inclined barrier section (116).

[0057] The first-second barrier portion (117) may also be formed of a first-second extension barrier portion (118) and a first-second inclined barrier portion (119) similar to the first-first barrier portion (115). The first-second extension barrier portion (118) is connected to the first embedded portion (111) and extends horizontally to the other side of the first-second fixed end (113). The first-second inclined barrier portion (119) is formed at a certain distance from the other end of the first-second extension barrier portion (118) and inclined by θ1 in a clockwise direction, and has the characteristic of having a first-second bent portion (119') formed at one end thereof that is horizontally aligned with the first-second extension barrier portion (118).

[0058] Next, FIGS. 4a and 4b each show a configuration in which, in the basic configuration of FIGS. 2a and 2b respectively, when the 3-1, 3-2 barrier sections (135, 137) of the 3rd embedded barrier hole (130) are each formed as a two-part structure, as shown in FIGS. 4a and 4b respectively, the 1-1, 1-2 barrier sections (115, 117) of the 1st embedded barrier hole (110) and the 1st, 2nd, 3rd embedded sections (111, 121, 131) are each formed as a two-part structure, and a bend section is formed in each of the 2-1, 2-2 barrier sections (125, 127).

[0059] The first-first barrier section (115) may be composed of a first-first extension barrier section (114) and a third-first inclined barrier section (116). The first-first extension barrier section (114) is connected to the first embedded section (111) and extends horizontally to one side of the first-first fixed end (112). The third-first inclined barrier section (116) is spaced apart from one end of the first-first extension barrier section (114) by a certain distance and has the characteristic of being formed to be inclined by θ1 in the counterclockwise direction, similar to the first-first conductor embedded hole (211).

[0060] The first-second barrier portion (117) may also be formed of a first-second extension barrier portion (118) and a first-second inclined barrier portion (119) similar to the first-first barrier portion (115). Each of the first-second barrier portions (117) of the first-first barrier portion (115) is connected to the first embedding portion (111) and extends horizontally to the other side of the first-second fixed end (113). The first-second inclined barrier portion (119) is spaced apart from the other end of the first-second extension barrier portion (118) by a certain distance and is formed to be inclined by θ1 in the clockwise direction, similar to the first-second conductor embedding hole (215).

[0061] As shown in the drawing, each of the first, second, and third embedding sections (111, 121, 131) is separated left and right with a △t interval in its central portion, and the first-first, 1-2 embedding sections (111′, 111″), the second-first, 2-2 embedding sections (121′, 121″), and the third-first, 3-2 embedding sections (131′, 131″) are formed. Among these, the 1st, 1-2 permanent magnet bars (311, 315), the 2nd, 2-2 permanent magnet bars (321, 325), and the 3rd, 3-1, 3-2 permanent magnet bars (331, 335) are embedded in the 1st, 1-2 embedded sections (111′, 111″), the 2nd, 2-2 embedded sections (121′, 121″), and the 3rd, 3-2 embedded sections (131′, 131″), respectively.

[0062] The 2-1 bend section is formed at one end of the 2-1 barrier section (125) and is inclined at the same angle as the 2-1 conductor insertion hole (221). The 2-2 bend section is formed at the other end of the 2-2 barrier section (127) and is inclined at the same angle as the 2-2 conductor insertion hole (225).

[0063] In particular, in the case of Fig. 4a, the first, second, and third embedding sections (111, 121, 131) in which permanent magnet bars are embedded are separated left and right with a gap of △t, as in Fig. 4b, and then the permanent magnet bars are embedded, so that when the rotor rotates at high speed, the phenomenon of cracks occurring in each embedding section due to centrifugal force is prevented in advance, thereby ensuring stable operation for a long time.

[0064] Although the above description is limited to preferred embodiments of the present invention, this is merely an example, and the present invention is not limited thereto, and can be implemented by being modified in various ways, and further, it will be obvious that separate technical features can be added and implemented based on the disclosed technical idea.

[0065] The unit disc of the rotor according to the present invention can improve the efficiency and power factor of the motor by fundamentally preventing the phenomenon of magnetic flux leakage during the operation of the rotor while allowing direct operation even when there is a problem with the inverter, and furthermore, can increase the starting torque required during the initial starting process of the motor and minimize the cogging torque that hinders the starting of the motor, and thus can be widely applied to a reluctance synchronous motor with a permanent magnet embedded, which is widely used throughout the industry.

Claims

1. A unit disk (1) that is stacked to form a rotor with a shaft hole (2) formed in each central portion, A first embedded portion (111) is formed adjacent to the corner portion of the shaft hole (1) and is formed on the unit disk (1) and is symmetrical with respect to the central axis of the shaft hole (1), and a pair of first-1, 1-2 fixing ends (112, 113) are provided on the left and right portions of each first embedded portion (111), and a first embedded barrier hole (110) is formed on the left and right portions of each of the first embedded portions (111) and is inclined counterclockwise at θ1 (90°<θ1<180°) and clockwise at θ2 (90°<θ1<180°) with respect to the first embedded portion (111) and is connected to the first embedded portion (111) at 1-1, 1-2 barrier portions (115, 117), respectively; A second embedded wall hole (120) is formed in a plurality of pieces formed on a unit plate (1) at a predetermined interval vertically above the first embedded wall hole (110) and symmetrical with respect to the central axis of the shaft hole (1), and in which a pair of second-1, 2-2 fixing ends (122, 123) are provided on the left and right sides of each second embedded wall hole (121), and in which second-1, 2-2 barrier parts (125, 127) that are connected to the second embedded wall hole (121) are formed on the left and right sides of each of the second embedded walls (121); A third embedded portion (131) is formed in which at least one or more are formed on the unit plate (1) between the first embedded barrier hole (110) and the second embedded barrier hole (120) and are symmetrical with respect to the central axis of the shaft hole (1), and a pair of 3-1, 3-2 fixing ends (132, 133) are provided on the left and right sides of each of the central portions of the third embedded portion (131), and a third embedded barrier hole (130) is formed in which 3-1, 3-2 barrier portions (135, 137) are respectively inclined counterclockwise at θ1 (90°<θ1<180°) and clockwise at θ2 (90°<θ1<180°) with respect to the third embedded portion (131) and are connected to the third embedded portion (131). The 1-1, 1-2 conductor embedding holes (211, 215) are formed on the unit plate (1) at the same angle as the 1-1, 1-2 barrier sections (115, 117), and are spaced apart from one end of the 1-1 barrier section (115) and the other end of the 1-2 barrier section (117) of each of the 1-1, 1-2 barrier sections (110) by a certain distance; The 2-1, 2-2 conductor embedding holes (221, 225) are formed on the unit plate (1) at the same angle as the 1-1, 1-2 conductor embedding holes (211, 215), and are spaced apart from one end of the 1-1 barrier portion (125) and the other end of the 2-2 barrier portion (127) of each 2-1 embedding barrier hole (120) by a certain distance; A third conductor embedding hole (230) having an elongated oval shape and formed in a unit disk (1) at a point between the 2-1 and 2-2 conductor embedding holes (221, 225) at a certain interval from each other, each having a central axis radially arranged toward the center of the shaft hole (2); A first permanent magnet bar (310) embedded between the first-1 and 1-2 fixed ends (112, 113), a second permanent magnet bar (320) embedded between the second-1 and 2-2 fixed ends (122, 123), and a third permanent magnet bar (330) embedded between the third-1 and 3-2 fixed ends (132, 133); A rotor unit disk of a direct drive permanent magnet embedded magnetic reluctance synchronous motor, comprising: a first conductor bar (410) embedded in each of the first conductor embedded holes (210), a second conductor bar (420) embedded in each of the second conductor embedded holes (220), and a third conductor bar (430) embedded in each of the third conductor embedded holes (230); 2. In paragraph 1, Each of the 3-1 and 3-2 barrier sections (135, 137) of the above 3rd embedded barrier hole (130) has a two-part structure, and each of the 3-1 barrier sections (135) is connected to the 3rd embedded section (131) and horizontally extends to one side of the 3-1 fixed end (132), and each of the 3-1 extended barrier sections (134) is connected to one side of the 3-1 extended barrier section (134) and horizontally extends to one side of the 3-1 fixed end (132), and each of the 3-1 inclined barrier sections (136) is connected to one side of the 3-1 extended barrier section (134) and horizontally extends to the other side of the 1-1 and 1-2 conductor embedded holes (211, 221) by a certain distance, and each of the 3-2 barrier sections (137) is connected to the 3rd embedded section (131) and horizontally extends to the other side of the 3-2 fixed end (133). A rotor unit disk of a permanent magnet embedded magnetic reluctance synchronous motor of a direct drive type, characterized in that it is formed of a 3-2 extension barrier section (138) and a 3-2 inclined barrier section (139) spaced apart from the other end of the 3-2 extension barrier section (138) by a certain distance and inclined by θ1 in the clockwise direction in the same manner as each of the 1-2 and 2-2 conductor embedding holes (215, 225).

3. In paragraph 2, At the other end of the 3-1 inclined wall portion (136), a 3-1 bent portion (136') is formed that is horizontally the same as the 3-1 extended wall portion (134), and at one end of the 3-2 inclined wall portion (139), a 3-2 bent portion (139') is formed that is horizontally the same as the 3-2 extended wall portion (136); Each of the 1-1 and 1-2 barrier sections (115, 117) of the above-mentioned first embedded barrier hole (110) has a two-part structure, and each of the 1-1 barrier sections (115) is connected to the first embedded section (111) and is formed of a 1-1 extension barrier section (114) that extends horizontally to one side of the 1-1 fixed end (112) and a 1-1 inclined barrier section (116) that is spaced apart from one end of the 1-1 extension barrier section (114) and is inclined at an angle of θ1 in the counterclockwise direction, and a 1-1 bent section (116') that is horizontally the same as the 1-1 extension barrier section (116) is formed at the other end of the 1-1 inclined barrier section (116), and each of the 1-2 barrier sections (117) is A rotor unit disk of a permanent magnet embedded magnetic reluctance synchronous motor of a direct drive type, characterized in that it is composed of a first-second extension barrier portion (118) that is connected to a first insertion portion (111) and extends horizontally to the other side of a first-second fixed end (113), and a first-second inclined barrier portion (119) that is spaced apart from the other end of the first-second extension barrier portion (118) by a certain distance and inclined at an angle of θ1 in a clockwise direction, and a first-second bent portion (119') that is formed at one end of the first-second inclined barrier portion (119) and is horizontally aligned with the first-second extension barrier portion (118) is formed.

4. In paragraph 2, Each of the 1-1 and 1-2 barrier sections (115, 117) of the above-mentioned first embedded barrier hole (110) has a two-part structure, and each of the 1-1 barrier sections (115) is connected to the first embedded section (111) and is formed by a 1-1 extension barrier section (114) that extends horizontally to one side of the 1-1 fixed end (112) and a 3-1 inclined barrier section (116) that is spaced apart from one end of the 1-1 extension barrier section (114) by a certain distance and is inclined counterclockwise at θ1 in the same way as the 1-1 conductor embedded hole (211), and each of the 1-2 barrier sections (117) is connected to the first embedded section (111) and is formed by a 1-2 extension barrier section (118) that extends horizontally to the other side of the 1-2 fixed end (113), and The first-second inclined wall portion (119) is formed by being spaced apart from the other end of the first-second extension wall portion (118) by a certain distance and inclined at θ1 in the clockwise direction in the same manner as the first-second conductor embedding hole (215); each of the first, second, and third embedding portions (111, 121, 131) has its central portion separated left and right by an interval of △t, and the first-first, 1-2 embedding portions (111′, 111″), the second-first, 2-2 embedding portions (121′, 121″), and the third-first, 3-2 embedding portions (131′, 131″) are formed; In each of the above 1-1, 1-2 embedded portions (111′, 111″), 2-1, 2-2 embedded portions (121′, 121″), and 3-1, 3-2 embedded portions (131′, 131″), 1-1, 1-2 permanent magnet bars (311, 315), 2-1, 2-2 permanent magnet bars (321, 325), and 3-1, 3-2 permanent magnet bars (331, 335) are embedded; A rotor unit disk of a direct drive permanent magnet embedded magnetic reluctance synchronous motor, characterized in that a 2-1 bending portion inclined at the same angle as the 2-1 conductor embedding hole (221) is formed at one end of the 2-1 barrier portion (125), and a 2-2 bending portion inclined at the same angle as the 2-2 conductor embedding hole (225) is formed at the other end of the 2-2 barrier portion (127).

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