Motor

Abstract

A motor according to one embodiment disclosed herein relates to an embedded permanent magnet motor. The motor may comprise: a stator including a hollow and a plurality of coils installed around the hollow; and a rotor rotatably disposed in the hollow. The rotor may include: a donut-shaped rotor core having a predetermined height; a plurality of first permanent magnets disposed inside the rotor core; and a plurality of slots disposed outward from the ends of two adjacent first permanent magnets among the plurality of first permanent magnets.

Description

motor

[0001] One embodiment disclosed in this document relates to a motor for a compressor, and more particularly, to a built-in permanent magnet motor with improved torque and efficiency.

[0002] In general, permanent magnet synchronous motors (PMSM) or permanent magnet motors (PMM) have high output and high efficiency characteristics, so they are widely used for household and industrial purposes.

[0003] These permanent magnet motors can be divided into two types, depending on the location of the permanent magnets installed on the rotor: a surface permanent magnet motor (SPM) with permanent magnets attached to the surface of the rotor, and an interior permanent magnet motor (IPMM) with permanent magnets embedded inside the rotor.

[0004] For embedded permanent magnet motors, permanent magnets can be efficiently arranged to minimize leakage flux and maximize effective flux. Furthermore, the arrangement of permanent magnets allows for the ability to accommodate loads across a wide range of output power.

[0005] The above information may be provided as background art to aid in understanding the present disclosure. No claim or determination is made as to whether any of the above is applicable as prior art related to the present disclosure.

[0006] A motor according to one embodiment of the present disclosure can provide a motor that minimizes leakage magnetic flux and effectively concentrates effective magnetic flux through efficient arrangement of permanent magnets.

[0007] A motor according to one embodiment of the present disclosure can provide a motor capable of high output relative to the number of magnets used through efficient arrangement of permanent magnets.

[0008] A motor according to one embodiment of the present disclosure can provide a motor capable of responding to a target output amount by adjusting the number of magnets used.

[0009] A motor according to one embodiment of the present disclosure may include a stator including a hollow body and a plurality of coils installed around the hollow body, and a rotor rotatably disposed in the hollow body. The rotor may include a donut-shaped rotor core having a predetermined height, a plurality of first permanent magnets disposed inside the rotor core, and a plurality of slots disposed in an outward direction from ends of two adjacent first permanent magnets among the plurality of first permanent magnets.

[0010] A motor according to one embodiment of the present disclosure may include a stator including a hollow body and a plurality of coils installed around the hollow body, and a rotor rotatably disposed in the hollow body. The rotor may include a donut-shaped rotor core having a predetermined height, a plurality of first permanent magnets disposed inside the rotor core, a plurality of slots disposed outward from ends of adjacent first permanent magnets among the plurality of first permanent magnets, and a plurality of second permanent magnets disposed in at least some of the plurality of slots.

[0011] However, the problem to be solved in this disclosure is not limited to the problem mentioned above, and may be determined in various ways without departing from the spirit and scope of this disclosure.

[0012] FIG. 1 is a cross-sectional view of a motor according to one embodiment of the present disclosure.

[0013] FIG. 2 is a cross-sectional view of a motor according to one embodiment of the present disclosure, which is an enlarged portion of a portion of FIG. 1.

[0014] FIG. 3 is an enlarged cross-sectional view of a motor of FIG. 1 according to one embodiment of the present disclosure.

[0015] FIG. 4 is a cross-sectional view of a motor according to an embodiment of the present disclosure, which is an enlarged view of part A of FIG. 2.

[0016] FIG. 5 is a cross-sectional view of a motor according to an embodiment of the present disclosure, which is an enlarged view of part A of FIG. 2.

[0017] FIG. 6 is an enlarged cross-sectional view of a motor of FIG. 1 according to one embodiment of the present disclosure.

[0018] FIG. 7 is a cross-sectional view of a rotor in the case of a 6-pole motor according to one embodiment of the present disclosure.

[0019] FIG. 8 is a cross-sectional view of a rotor in the case of a four-pole motor according to one embodiment of the present disclosure.

[0020] FIG. 9 is a cross-sectional view of a rotor in the case of an 8-pole motor according to one embodiment of the present disclosure.

[0021] The embodiments of this document and the terminology used herein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0022] Hereinafter, in this document, “front-back direction”, “left-right direction”, and “up-down direction” may be used based on the drawings shown, and the shape and position of each component are not limited thereby.

[0023] According to some embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the multiple entities may be separated and placed in other components.

[0024] The motor (1) described below may be understood as an example to aid understanding of the present disclosure, and it is understood that it may be implemented in various modified forms. In addition, the attached drawings are not drawn to scale, and the dimensions of some components may be exaggerated to aid understanding of the present disclosure.

[0025] FIG. 1 is a cross-sectional view of a motor (1) according to one embodiment of the present disclosure.

[0026] Referring to Fig. 1, the motor (1) may be an interior permanent magnet motor (IPM). The motor (1) may include a stator (10) and a rotor (30).

[0027] According to one embodiment, the stator (10) may include a stator core (11) and a coil groove (13). The stator core (11) may be formed of a conductive material including, for example, ferrite.

[0028] According to one embodiment, the coils (15) may be respectively arranged inside the coil grooves (13). A plurality of coils (15) may be arranged in one coil groove (13). For example, two coils (15) may be arranged in one coil groove (13).

[0029] According to one embodiment, the rotor (30) may be rotatably arranged in a hollow space (17) located inside the stator core (11). The rotor (30) may include a rotor core (31) and a plurality of permanent magnets (41, 45) arranged inside the rotor core (31). The rotor core (31) may be made of a magnetic material. A shaft hole (33) may be formed at the center of the rotor (30) to which a shaft is fixed.

[0030] According to one embodiment, the rotor (30) may have a substantially donut shape. The rotor (30) may have a substantially donut shape due to, for example, a shaft hole (33) having a predetermined height and located at the center. The rotor (30) may also have a cylindrical shape, for example, including a shaft hole (33) located as an empty space at the center.

[0031] Although not shown, the shaft can be fixed to the shaft hole (33). In response to the rotation of the rotor (30), the shaft can rotate integrally with the rotor (30).

[0032] According to one embodiment, the plurality of permanent magnets (41, 45) may include a plurality of first permanent magnets (41) and a plurality of second permanent magnets (45).

[0033] According to one embodiment, the first permanent magnet (41) may include a pair of first-first permanent magnets (41-1) and a first-second permanent magnet (41-2) disposed adjacent to the first-first permanent magnet (41-1). For example, when a pair of first-first permanent magnets (41-1) and first-second permanent magnets (41-2) form one first permanent magnet (41), the first-first permanent magnet (41-1) may be positioned on the left side of the first permanent magnet (41), and the first-second permanent magnet (41-2) may be positioned on the right side of the first permanent magnet (41).

[0034] According to one embodiment, the first permanent magnet (41-1) and the first permanent magnet (41-2) may be arranged to be inclined at a predetermined angle. The predetermined angle may be, for example, an obtuse angle, but is not limited thereto, and may be a right angle or an acute angle.

[0035] According to one embodiment, adjacent first permanent magnets (41) among the plurality of first permanent magnets (41) can be arranged to have different magnetic poles.

[0036] According to one embodiment, the second permanent magnet (45) is positioned adjacent to the end of the first permanent magnet (41) and may be arranged radially. The second permanent magnet (45) may be arranged outward from the end of two adjacent first permanent magnets (41).

[0037] According to one embodiment, the second permanent magnet (45) may be selectively arranged as needed. For example, the rotor (30) may include a plurality of slots (35) (e.g., slots (35) of FIG. 6) implemented as spaces for fixing the second permanent magnets (45). The second permanent magnets (45) may be selectively arranged in the slots (35). The second permanent magnets (45) may be arranged differently depending on the required output of the motor (1).

[0038] According to one embodiment, the rotor (30) may include permanent magnets arranged in a mixed form of V-shaped permanent magnets and spoke-type permanent magnets through the arrangement of the first permanent magnets (41) and the second permanent magnets (45).

[0039] According to one embodiment, when the first permanent magnet (41) is formed of three pairs of first permanent magnets (41), the motor (1) can be implemented as a six-pole motor. However, the present invention is not limited thereto, and when the first permanent magnets (41) are formed of two pairs, the motor (1) can be implemented as a four-pole motor, and further, when the first permanent magnets (41) are formed of four pairs, the motor (1) can be implemented as an eight-pole motor. Various other embodiments are possible. An expanded embodiment in which the motor (1) is implemented as a four-pole motor is described in FIG. 8, and an expanded embodiment in which the motor (1) is implemented as an eight-pole motor is described in FIG. 9.

[0040] FIG. 2 is a cross-sectional view of a motor (1) (e.g., motor (1) of FIG. 1) enlarged from a portion of FIG. 1 according to one embodiment of the present disclosure.

[0041] FIG. 3 is a cross-sectional view of a motor (1) (e.g., motor (1) of FIG. 1) according to one embodiment of the present disclosure, which is an enlarged portion of FIG. 1. FIG. 3 can be understood as schematically illustrating the direction in which the magnetic flux (hereinafter referred to as magnetic flux) is concentrated in FIG. 2 using thick curved arrows.

[0042] The configurations of FIGS. 2 and 3 may correspond at least in part to the configuration of FIG. 1, and any overlapping descriptions may be omitted. In addition, the embodiments of FIGS. 2 and 3 may be optionally combined with the embodiment of FIG. 1.

[0043] Referring to FIGS. 2 and 3, the plurality of permanent magnets (41, 45) may include a first permanent magnet (41) and a second permanent magnet (45). The first permanent magnet (41) may be configured as a pair of a first-first permanent magnet (41-1) and a first-second permanent magnet (41-2). The first-first permanent magnet (41-1) and the first-second permanent magnet (41-2) may be arranged symmetrically with respect to the d-axis (d1 axis or d2 axis). Here, the d-axis may be understood as an axis on which magnetic flux is concentrated. The d-axis may extend outward from the center of the motor (1) (or the rotor (30).

[0044] According to one embodiment, a bridge (42) may be arranged between the first permanent magnet (41-1) and the first permanent magnet (41-2). The bridge (42) may be implemented as a part of the rotor core (31). The bridge (42) may have a predetermined width. The bridge (42) may support the first permanent magnet (41, 45) arranged inside the rotor core (31). For example, the bridge (42) may prevent the first permanent magnet (41) from being detached or the rotor core (31) from being damaged due to the rotation of the rotor (30).

[0045] According to one embodiment, the second permanent magnet (45) may be placed in a slot (e.g., 35 in FIG. 6). The slot (35) may be a space for selectively placing the second permanent magnet (45). The slot (35) may be placed in an outward direction from the ends of two adjacent first permanent magnets (41) among a plurality of first permanent magnets (41).

[0046] According to one embodiment, the slot (35) may be arranged on the outer side of the first-first permanent magnet (41-1) of the first permanent magnet (41) and the first-second permanent magnet (41-2) of the first permanent magnet (41) adjacent to the first permanent magnet (41). The slot (35) may extend in the outer radial direction from the ends of the first-first permanent magnet (41-1) and the first-second permanent magnet (41-2).

[0047] According to one embodiment, the slots (35) may be provided in multiple numbers, and the number of slots (35) and the number of first permanent magnets (41) may be provided in the same number. For example, when the motor (1) is implemented as a six-pole motor, the plurality of slots (35) may be provided in six numbers, when the motor (1) is implemented as a four-pole motor, the plurality of slots (35) may be provided in four numbers, and when the motor (1) is implemented as an eight-pole motor, the plurality of slots (35) may be provided in eight numbers.

[0048] According to one embodiment, the slots (35) may be arranged symmetrically left and right with respect to the q-axis. Here, the q-axis is an axis perpendicular to the d-axis (d1-axis or d2-axis), and may be understood as an axis that generates torque. The q-axis may be understood as a line extending outward from the center of the motor (1) (or rotor (30)).

[0049] According to one embodiment, the second permanent magnet (45) can be selectively placed in the slot (35). The second permanent magnet (45) can be placed in at least one slot (35) among the plurality of slots (35). For example, the second permanent magnet (45) can be placed in all of the slots (35), or the second permanent magnet (45) can be placed in some of the plurality of slots (35). When the second permanent magnet (45) is placed in some of the plurality of slots (35), the slot (35) in which the second permanent magnet (45) is placed and the slot (35) in which the second permanent magnet (45) is not placed can be alternately positioned.

[0050] In one embodiment, the second permanent magnet (45) may not be placed in all slots (35).

[0051] According to one embodiment, when the second permanent magnet (45) is placed in the slot (35), the second permanent magnet (45) can be placed so as to be symmetrical left and right with respect to the q-axis.

[0052] According to one embodiment, the second permanent magnet (45) may be selectively placed in the slot (35) considering the output of the motor (1). As the output of the motor (1) increases, the number of second permanent magnets (45) placed in the slot (35) may increase.

[0053] According to one embodiment, the outer surface of the rotor core (31) where the slot (35) is located may form a bridgeless structure (e.g., bridgeless structure (311) of FIG. 4) or a bridge structure (e.g., bridge structure (313) of FIG. 5). This will be described in relation to FIGS. 4 and 5.

[0054] According to one embodiment, the arrangement structure of the first permanent magnet (41) and the second permanent magnet (45) can increase the effective magnetic flux, thereby improving the output performance of the motor (1). In addition, the motor performance can be efficiently improved by using a small number of permanent magnets.

[0055] According to one embodiment, the first permanent magnet (41) and the second permanent magnet (45) have a radius equal to a predetermined ratio of the radius from the center of the rotor (30), thereby facilitating magnetization of the second permanent magnet (45) relatively to the motor in which the spoke-type permanent magnets are arranged. In addition, the second permanent magnet (45) is arranged at least a portion of the radius, thereby reducing leakage flux generated near the shaft relatively to the motor in which the spoke-type permanent magnets are arranged, thereby improving motor performance.

[0056] According to one embodiment, the motor (1) of the present disclosure can effectively concentrate magnetic flux through the arrangement of the first permanent magnet (41) and the second permanent magnet (45). Accordingly, the counter electromotive force generated in the motor increases, thereby reducing the winding resistance of the coil (e.g., the coil (15) of FIG. 1) and the copper loss generated by the current flowing in the coil. Accordingly, the output of the motor (1) can be increased.

[0057] FIG. 4 is a cross-sectional view of a motor (1) (e.g., motor (1) of FIG. 1) enlarged from part A of FIG. 2 according to one embodiment of the present disclosure.

[0058] FIG. 5 is a cross-sectional view of a motor (1) according to one embodiment of the present disclosure, which is an enlarged view of part A of FIG. 2.

[0059] FIG. 4 can be understood as illustrating a case where a rotor (e.g., rotor (30) of FIG. 1) forms a bridgeless structure (311), and FIG. 5 can be understood as illustrating a case where a rotor (30) forms a bridge structure (313).

[0060] The embodiments of FIGS. 4 and 5 can be optionally combined with the embodiments of FIGS. 1 to 3.

[0061] Referring to FIG. 4, a bridgeless structure (311) may be formed on the outside of a slot (e.g., a slot (35) of FIG. 6). For example, the bridgeless structure (311) may be formed by removing at least a portion of an outer surface of a rotor (30) located on the outside of the slot (35). The bridgeless structure (311) may include a first protrusion (3111) and a second protrusion (3112) and an opening (3113) formed between the first protrusion (3111) and the second protrusion (3112). Due to the bridgeless structure (311), an open end may be formed in the outer radial direction of the slot (35). The width of the open end may be, for example, relatively short compared to the width of the slot (35).

[0062] According to one embodiment, the first protrusion (3111) and the second protrusion (3112) included in the bridgeless structure (311) can support the second permanent magnet (45) arranged in the slot (35) so that it does not come off. For example, as the rotor (30) rotates at high speed, the second permanent magnet (45) can be prevented from coming off to the outside of the motor (1).

[0063] According to one embodiment, the bridgeless structure (311) can be formed on the outer surface of the slot (35).

[0064] According to one embodiment, by reducing the eddy flux generated outside the flux path of the rotor (30) around the second permanent magnet (45) due to the bridgeless structure (311), the leakage flux can be reduced. As a result, power loss and overheating due to the operation of the motor (1) can be prevented, and the output performance of the motor (1) can be improved. In addition, the output performance of the motor (1) can be improved by reducing the flux leaking from the path along which the flux moves from the stator (10) to the rotor (30).

[0065] Referring to Fig. 5, a bridge structure (313) may be formed on the outside of the slot (35). The bridge structure (313) may be formed by closing the outer surface of the rotor (30) located on the outside of the slot (35).

[0066] According to one embodiment, a closed end may be formed in the outer radial direction of the slot (35) due to the bridge structure (313). The bridge structure (313) may generate a certain leakage flux, so that the output of the motor may be relatively reduced compared to the case where the bridgeless structure (311) is formed.

[0067] According to one embodiment, the bridge structure (313) can support the second permanent magnet (45) arranged in the slot (35) so as not to be detached. For example, when the bridge structure (313) is applied to the outside of the rotor (30), the outside of the slot (35) is closed, so that the second permanent magnet (45) arranged in the slot (35) can be prevented from being detached when the rotor (30) rotates at high speed. When the bridge structure (313) is applied, the support of the second permanent magnet (45) can be relatively strengthened compared to when the bridgeless structure (311) is applied.

[0068] According to one embodiment, the bridgeless structure (311) or the bridge structure (313) can be selectively applied considering the output of the motor (1) and the arrangement stability of the second permanent magnet (45). Therefore, the bridgeless structure (311) or the bridge structure (313) can be selectively applied in response to the target output of the motor (1). For example, the bridgeless structure (311) can be applied to all slots (35) of the rotor (30), or the bridge structure (313) can be applied to all slots (35) of the rotor (30). In addition, the bridgeless structure (311) can be applied to some slots (35) of the rotor (30), and the bridge structure (313) can be applied to the remaining slots (35).

[0069] FIG. 6 is an enlarged view of a motor (1) (e.g., a cross-sectional view of FIG. 1) according to one embodiment of the present disclosure.

[0070] Fig. 6 illustrates a motor (1) in which a second permanent magnet (45) is not placed in at least some of the slots (35) in Fig. 2, and any description overlapping with Fig. 2 may be omitted.

[0071] The embodiment of FIG. 6 can be optionally combined with the embodiments of FIGS. 1 to 5.

[0072] Referring to FIG. 6, second permanent magnets (45) may be placed in at least some of the slots (35) of the rotor (30). For example, some of the slots (35) may have second permanent magnets (45) placed therein, and the remaining slots (35) may not have second permanent magnets placed therein. Hereinafter, a slot (35) in which a second permanent magnet (45) is placed may be referred to as an occupied slot, and a slot (35) in which a second permanent magnet (45) is not placed may be referred to as an unoccupied slot.

[0073] In one embodiment, when at least some of the slots (35) of the rotor (30) are configured as unoccupied slots, the output may be lowered relative to the case where all slots (35) are occupied slots. For example, when unoccupied slots exist, the output may be lowered relative to the case where all slots (35) are occupied slots as the magnetic flux concentrated in the d-axis (d1-axis or d2-axis) decreases.

[0074] According to one embodiment, all slots (35) of the rotor (30) may be configured as occupied slots. The motor output in the case where all slots (35) are configured as occupied slots will be assumed to be W1.

[0075] In one embodiment, some slots (35) of the rotor (30) may be configured as occupied slots and the remaining slots (35) as unoccupied slots. It will be assumed that the motor output in the case where some slots (35) are configured as occupied slots and the remaining slots (35) are configured as unoccupied slots is W2.

[0076] In one embodiment, all slots (35) of the rotor (30) may be configured as unoccupied slots. The motor output in the case where all slots (35) are configured as unoccupied slots will be assumed to be W3.

[0077] In the above case, when comparing the motor outputs W1, W2, and W3, the relationship W1>W2>W3 can be achieved. Therefore, by selectively arranging the second permanent magnet (45) in the slots (35), the motor (1) can have various output areas in response to the required output. For example, in the case of a motor (1) operating under high load conditions, a motor (1) in which the second permanent magnet (45) is arranged in all slots (35) can be applied, and in the case of a motor (1) operating under low load conditions, a motor in which the second permanent magnet (45) is arranged in some slots (35) can be applied.

[0078] In one embodiment, when some slots (35) of the rotor (30) are configured as occupied slots and the remaining slots (35) are configured as unoccupied slots, the occupied slots and the unoccupied slots may be arranged alternately. In addition, when some slots (35) of the rotor (30) are configured as occupied slots and the remaining slots (35) are configured as unoccupied slots, the number of occupied slots and the number of unoccupied slots may be the same.

[0079] FIG. 7 is a cross-sectional view of a rotor (30) in the case of a 6-pole motor according to one embodiment of the present disclosure.

[0080] FIG. 8 is a cross-sectional view of a rotor (30) in the case of a 4-pole motor according to one embodiment of the present disclosure.

[0081] FIG. 9 is a cross-sectional view of a rotor (30) in the case of an 8-pole motor according to one embodiment of the present disclosure.

[0082] The embodiments of FIGS. 7 to 9 can be optionally combined with the embodiments of FIGS. 1 to 6.

[0083] Referring to FIG. 7, the rotor (30) may include a rotor core (31) and permanent magnets (41, 45). The permanent magnets (41, 45) may include a plurality of first permanent magnets (41) and a plurality of second permanent magnets (45). The rotor (30) may include six slots (35).

[0084] According to one embodiment, (a) may be understood as illustrating a case where a second permanent magnet (45) is arranged in all slots (35) of the rotor (30), (b) may be understood as illustrating a case where a second permanent magnet (45) is arranged in some slots (35) of the rotor (30), and (c) may be understood as illustrating a case where a second permanent magnet (45) is not arranged in all slots (35) of the rotor (30).

[0085] According to one embodiment, all slots (35) of the rotor (30) in (a) may be configured as occupied slots.

[0086] According to one embodiment, some slots (35) of the rotor (30) in (b) may be configured as occupied slots, and the remaining slots may be configured as unoccupied slots. The number of occupied slots and unoccupied slots may be the same. The occupied slots and unoccupied slots may be arranged alternately.

[0087] In one embodiment, all slots (35) of the rotor (30) in (c) may be configured as unoccupied slots.

[0088] According to one embodiment, if the motor output when the rotor of (a) is applied to the motor (1) is W11, the motor output when the rotor of (b) is applied to the motor (1) is W12, and the motor output when the rotor of (c) is applied to the motor (1) is W13 when other conditions are the same, then W11 to W13 can have the relationship W11>W12>W13. Accordingly, the rotors of (a) to (c) can be selectively applied in response to the target output of the motor (1).

[0089] Referring to FIG. 8, the rotor (30a) may include a rotor core (31a) and permanent magnets (41a, 45a). The permanent magnets (41a, 45a) may include a plurality of first permanent magnets (41a) and a plurality of second permanent magnets (45a). The first permanent magnet (41a) may include a first-first permanent magnet (41a-1) and a first-second permanent magnet (41a-2). The rotor (30a) may include four slots (35a).

[0090] According to one embodiment, (a) may be understood as illustrating a case where a second permanent magnet (45a) is arranged in all slots (35a) of a rotor (30a), (b) may be understood as illustrating a case where a second permanent magnet (45a) is arranged in some slots (35a) of a rotor (30a), and (c) may be understood as illustrating a case where a second permanent magnet (45a) is not arranged in all slots (35a) of a rotor (30a).

[0091] According to one embodiment, all slots (35a) of the rotor (30a) in (a) may be configured as occupied slots.

[0092] According to one embodiment, some slots (35a) of the rotor (30a) in (b) may be configured as occupied slots, and the remaining slots may be configured as unoccupied slots. The number of occupied slots and unoccupied slots may be the same. The occupied slots and unoccupied slots may be arranged alternately.

[0093] According to one embodiment, all slots (35a) of the rotor (30a) in (c) may be configured as unoccupied slots.

[0094] According to one embodiment, if the motor output when the rotor of (a) is applied to the motor (1) is W21, the motor output when the rotor of (b) is applied to the motor (1) is W22, and the motor output when the rotor of (c) is applied to the motor (1) is W23 when other conditions are the same, then W21 to W23 can have the relationship W21>W22>W23. Accordingly, the rotors of (a) to (c) can be selectively applied in response to the target output of the motor (1).

[0095] Referring to FIG. 9, the rotor (30b) may include a rotor core (31b) and permanent magnets (41b, 45b). The permanent magnets (41b, 45b) may include a plurality of first permanent magnets (41b) and a plurality of second permanent magnets (45b). The first permanent magnet (41b) may include a first-first permanent magnet (41b-1) and a first-second permanent magnet (41b-2). The rotor (30b) may include eight slots (35a).

[0096] According to one embodiment, (a) may be understood as illustrating a case where a second permanent magnet (45b) is arranged in all slots (35b) of a rotor (30b), (b) may be understood as illustrating a case where a second permanent magnet (45b) is arranged in some slots (35b) of a rotor (30b), and (c) may be understood as illustrating a case where a second permanent magnet (45b) is not arranged in all slots (35b) of a rotor (30b).

[0097] According to one embodiment, all slots (35b) of the rotor (30b) in (a) may be configured as occupied slots.

[0098] According to one embodiment, some slots (35b) of the rotor (30b) in (b) may be configured as occupied slots, and the remaining slots may be configured as unoccupied slots. The number of occupied slots and unoccupied slots may be the same. The occupied slots and unoccupied slots may be arranged alternately.

[0099] According to one embodiment, all slots (35b) of the rotor (30b) in (c) may be configured as unoccupied slots.

[0100] According to one embodiment, if the motor output when the rotor of (a) is applied to the motor (1) is W31, the motor output when the rotor of (b) is applied to the motor (1) is W32, and the motor output when the rotor of (c) is applied to the motor (1) is W33 when other conditions are the same, then W31 to W33 can have the relationship W31>W32>W33. Accordingly, the rotors of (a) to (c) can be selectively applied in response to the target output of the motor (1).

[0101] A motor (1) according to one embodiment of the present disclosure can provide a motor (1) with improved output by minimizing leakage magnetic flux through efficient arrangement of permanent magnets and effectively concentrating effective magnetic flux.

[0102] A motor (1) according to one embodiment of the present disclosure can provide a motor (1) capable of high output compared to the number of magnets used through the arrangement of efficient permanent magnets (41, 45).

[0103] A motor (1) according to one embodiment of the present disclosure can provide a motor (1) capable of responding to a target output amount by adjusting the number of permanent magnets (41, 45) used.

[0104] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0105] A motor according to one embodiment of the present disclosure (e.g., motor (1) of FIG. 1) may include a stator (10) including a hollow (17) and a plurality of coils (15) installed around the hollow (17), and a rotor (30) rotatably disposed in the hollow (17). The rotor (30) may include a donut-shaped rotor core (31) having a predetermined height, a plurality of first permanent magnets (41) disposed inside the rotor core (31), and a plurality of slots (35) disposed outward from ends of two adjacent first permanent magnets (41) among the plurality of first permanent magnets (41).

[0106] A motor (1) according to one embodiment of the present disclosure may include a plurality of second permanent magnets (45) arranged in at least some of the plurality of slots (35).

[0107] In a motor (1) according to one embodiment of the present disclosure, the rotor core (31) may include a bridgeless structure (311) positioned adjacent to the outside of the slot (35).

[0108] In a motor (1) according to one embodiment of the present disclosure, the rotor core (31) may include a bridge structure (313) positioned adjacent to the outside of the slot (35).

[0109] In a motor (1) according to one embodiment of the present disclosure, the first permanent magnet (41) may include a pair of first-first permanent magnets (41-1) and first-second permanent magnets (41-2). The first-first permanent magnet (41-1) and the first-second permanent magnet (41-2) may be arranged to have a predetermined angle.

[0110] In a motor (1) according to one embodiment of the present disclosure, a pair of the first-first permanent magnet (41-1) and the first-second permanent magnet (41-2) may be arranged symmetrically with respect to the d-axis extending outward from the center of the rotor (30).

[0111] In a motor (1) according to one embodiment of the present disclosure, the first permanent magnet (41) may further include a bridge (42) arranged between the first-first permanent magnet (41-1) and the first-second permanent magnet (41-2).

[0112] In a motor (1) according to one embodiment of the present disclosure, a second permanent magnet (45) may be placed in all slots among the plurality of slots (35).

[0113] In a motor (1) according to one embodiment of the present disclosure, a second permanent magnet (45) is arranged in some of the plurality of slots (35), and the second permanent magnet (45) can be arranged alternately with respect to the plurality of slots (35).

[0114] In a motor (1) according to one embodiment of the present disclosure, the plurality of slots (35) may be arranged symmetrically with respect to the q-axis extending outward from the center of the rotor (30).

[0115] In a motor (1) according to one embodiment of the present disclosure, the plurality of second permanent magnets (45) can be arranged symmetrically with respect to the q-axis.

[0116] A motor (1) according to one embodiment of the present disclosure may include a stator (10) including a hollow (17) and a plurality of coils (15) installed around the hollow (17), and a rotor (30) rotatably disposed in the hollow (17). The rotor (30) may include a donut-shaped rotor core (31) having a predetermined height, a plurality of first permanent magnets (41) disposed inside the rotor core (31), a plurality of slots (35) disposed in an outward direction from ends of two adjacent first permanent magnets (41) among the plurality of first permanent magnets (41), and a plurality of second permanent magnets (45) disposed in at least some of the plurality of slots (35).

[0117] In a motor (1) according to one embodiment of the present disclosure, the rotor core (31) may include a bridgeless structure (311) positioned adjacent to the outside of the slot (35).

[0118] In a motor (1) according to one embodiment of the present disclosure, the rotor core (31) may include a bridge structure (313) positioned adjacent to the outside of the slot (35).

[0119] In a motor (1) according to one embodiment of the present disclosure, the first permanent magnet (41) may include a pair of first-first permanent magnets (41-1) and first-second permanent magnets (41-2). The first-first permanent magnet (41-1) and the first-second permanent magnet (41-2) may be arranged to have a predetermined angle.

[0120] In a motor (1) according to one embodiment of the present disclosure, a pair of the first-first permanent magnet (41-1) and the first-second permanent magnet (41-2) may be arranged symmetrically with respect to the d-axis extending outward from the center of the rotor (30).

[0121] In a motor (1) according to one embodiment of the present disclosure, the first permanent magnet (41) may further include a bridge (42) arranged between the first-first permanent magnet (41-1) and the first-second permanent magnet (41-2).

[0122] In a motor (1) according to one embodiment of the present disclosure, a second permanent magnet (45) may be placed in all slots among the plurality of slots (35).

[0123] In a motor (1) according to one embodiment of the present disclosure, a second permanent magnet (45) is arranged in some of the plurality of slots (35), and the second permanent magnet (45) can be arranged alternately with respect to the plurality of slots (35).

[0124] In a motor (1) according to one embodiment of the present disclosure, the plurality of slots (35) may be arranged symmetrically with respect to the q-axis extending outward from the center of the rotor (30).

[0125] In a motor (1) according to one embodiment of the present disclosure, the plurality of second permanent magnets (45) can be arranged symmetrically with respect to the q-axis.

Claims

1. A stator (10) including a hollow body (17) and a plurality of coils (15) installed around the hollow body (17); and It includes a rotor (30) that is rotatably placed in the above hollow (17), The above rotor (30) is, A donut-shaped rotor core (31) having a predetermined height; A plurality of first permanent magnets (41) arranged inside the rotor core (31); and A motor (1) comprising a plurality of slots (35) arranged in an outward direction from the ends of two adjacent first permanent magnets (41) among the plurality of first permanent magnets (41).

2. In paragraph 1, A motor (1) comprising a plurality of second permanent magnets (45) arranged in at least some of the plurality of slots (35).

3. In paragraph 1 or 2, The above rotor core (31) includes a bridgeless structure (311) located adjacent to the outer side of the slot (35), the motor (1).

4. In paragraph 1 or 2, The above rotor core (31) includes a bridge structure (313) located adjacent to the outer side of the slot (35), the motor (1).

5. In any one of paragraphs 1 to 4, The above first permanent magnet (41) includes a pair of first-first permanent magnets (41-1) and first-second permanent magnets (41-2), The above 1-1 permanent magnet (41-1) and the above 1-2 permanent magnet (41-2) are arranged at a predetermined angle, in a motor (1).

6. In paragraph 5, A motor (1) in which a pair of the first-first permanent magnets (41-1) and the first-second permanent magnets (41-2) are arranged symmetrically with respect to the d-axis extending outward from the center of the rotor (30).

7. In paragraph 5, A motor (1), wherein the first permanent magnet (41) further includes a bridge (42) arranged between the first-first permanent magnet (41-1) and the first-second permanent magnet (41-2).

8. In paragraph 2, A motor (1) in which a second permanent magnet (45) is placed in every slot among the plurality of slots (35).

9. In paragraph 2, A second permanent magnet (45) is placed in some of the above plurality of slots (35), The above second permanent magnet (45) is arranged alternately with respect to the plurality of slots (35) of the motor (1).

10. In any one of paragraphs 1 to 9, The above plurality of slots (35) are arranged symmetrically with respect to the q-axis extending outward from the center of the rotor (30), in a motor (1).

11. In any one of paragraphs 2 to 10, The above plurality of second permanent magnets (45) are arranged symmetrically with respect to the q-axis, motor (1).

12. A stator (10) including a hollow (17) and a plurality of coils (15) installed around the hollow (17); and It includes a rotor (30) that is rotatably placed in the above hollow (17), The above rotor (30) is, A donut-shaped rotor core (31) having a predetermined height; A plurality of first permanent magnets (41) arranged inside the rotor core (31); A plurality of slots (35) arranged in an outward direction from the ends of two adjacent first permanent magnets (41) among the plurality of first permanent magnets (41); and A motor (1) comprising a plurality of second permanent magnets (45) arranged in at least some of the plurality of slots (35).

13. In paragraph 12, The above rotor core (31) includes a bridgeless structure (311) located adjacent to the outer side of the slot (35), the motor (1).

14. In paragraph 12, The above rotor core (31) includes a bridge structure (313) located adjacent to the outer side of the slot (35), the motor (1).

15. In any one of paragraphs 12 to 14, The above first permanent magnet (41) includes a pair of first-first permanent magnets (41-1) and first-second permanent magnets (41-2), The above 1-1 permanent magnet (41-1) and the above 1-2 permanent magnet (41-2) are arranged at a predetermined angle, in a motor (1).

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