Rotor assembly for a motor

Abstract

Rotor assembly for a motor, including: a core body (100) through which a shaft (10) passes in an axial center and on which webs (120) are arranged radially along an outer circumference and first sliding connection areas (121) are included at end edges; Field windings (200) that are individually wound around the outer circumferences of the webs (120), and maintain a state in which they are spaced apart from each other while being wound around the webs; and a cylindrical core outer part (300) which is designed to surround the outer surface of the core body (100), wherein the cylindrical core outer part (300) includes second sliding connection areas (320) on an inner circumference, such that the end faces of the webs (120) are slidably connected to it along an axial direction by means of a form fit, characterized in that the outer core part (300) has a plurality of through holes (330) which are formed along an axial direction of the outer core part (300).

Description

CROSS-REFERENCE(S) TO A RELATED APPLICATION

[0001] This application claims priority to Korean Patent Application No. 10-2014-0055838, filed on May 9, 2014, in the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTIONField of the invention

[0002] The present invention relates to a rotor structure for a motor, and more particularly to a rotor structure for a motor in which webs and an externally integrally formed core outer part are slidably connected to each other via a form fit, wherein the field windings can be easily wound around the webs and the assembly time can be reduced accordingly. Description of the state of the art

[0003] In general, motors are devices that convert electrical energy into mechanical energy to achieve rotational power.

[0004] Motors are classified into DC and AC motors according to the type of external power they receive. The motor consists of a stator and a rotor (or armature).

[0005] The motor works based on a principle where the torque in the rotor is generated by a rotating magnetic field that is formed when current flows through a wound coil.

[0006] One type of motor is a wound rotor motor, in which field windings are wound around the rotor's webs. In a wound rotor motor, the field windings are wound by inserting needles through slots formed at the ends of the radially projecting webs.

[0007] In an existing motor with a wound rotor, it is necessary to create wide slots to accommodate the needles. Therefore, the fill factor of the coils is low and the winding time increases, resulting in an increase in the overall manufacturing time.

[0008] In addition, it should be understood that field windings wound around the webs may come out through the slots due to centrifugal force generated by high-speed rotation of the rotor at the time of driving the motor.

[0009] As a prior art document related to the present invention, Korean patent KR 10 1 370 655 B1 (February 27, 2014) discloses a synchronous motor with a wound rotor. Furthermore, publication CN 1 03 545 947 A discloses a rotor structure with a cylindrical outer part that surrounds a core body with webs and is connected to them via sliding connections. SUMMARY OF THE INVENTION

[0010] One aspect of the present invention is directed to a rotor structure for a motor in which field windings are wound around webs in a state where a core body is separated from a core outer portion, and the webs are slidably connected to the core outer portion via a form fit. The field windings can be easily wound around the webs, the assembly time can be reduced accordingly, and the field windings cannot be separated from the webs by centrifugal forces. These objects are achieved by a rotor structure according to claim 1.

[0011] According to an embodiment of the present invention, a rotor structure for a motor specifically comprises: a core body through which a shaft passes at an axial center and webs are arranged radially along an outer circumference and first sliding connection portions are included at leading edges; field windings individually wound around the outer circumferences of the teeth and maintaining a spaced-apart state while being wound around the webs; and a cylindrical core outer member configured to surround the outside of the core body, the cylindrical core outer member including second sliding connection portions at an inner circumference such that the leading edges of the webs are slidably connected thereto along an axial direction by means of a form fit.

[0012] The first sliding connection portion may be a concave groove having a length of the core body in the axial direction and widening rearwardly from an open front end, and the second sliding connection portion may be a concave protrusion slidably connected to the first sliding connection portion via a form fit.

[0013] The core outer part includes a plurality of through holes which may be formed along a circumferential direction so that needles can be inserted through clearance portions of the webs from the outside at the time of winding the field windings.

[0014] A plurality of through holes are formed along an axial direction of the core outer part.

[0015] A plurality of flat surfaces on which the webs are to be arranged may be formed at regular intervals along an inner peripheral surface of the core outer part, and the through holes may be formed at adjacent regions of the flat surface.

[0016] The rotor structure may further include concave grooves in the inner peripheral surface of the core outer part, the concave grooves having a length in an axial direction and being narrower at positions of the through holes.

[0017] The first sliding connection portion and the second sliding connection portion may be integrally connected to each other by using a separate fastener or an adhesive when they are slidably connected to each other by mold locking. SHORT DESCRIPTION OF THE DRAWING Fig. 1 is an exploded perspective view of a rotor assembly for a motor according to the present invention. Fig. 2 is a perspective view showing the rotor structure for the motor in an assembled state according to the present invention. Fig. 3 is a plan view showing the rotor structure for the motor according to the present invention. Fig. 4 is a front cross-sectional view showing the rotor structure for the motor according to the present invention. DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0018] Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] The advantages and features of the present invention and methods of achieving them will become more apparent from the following embodiments described in conjunction with the accompanying drawings.

[0020] However, the invention is not limited to the following embodiments and may be embodied in various forms. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The scope of the invention is defined by the appended claims.

[0021] Therefore, detailed descriptions of well-known technologies are omitted since they would unnecessarily obscure the present invention.

[0022] Fig. 1 is an exploded perspective view illustrating a rotor assembly for a motor according to the present invention, and Fig. 2 is an assembled perspective view illustrating the rotor assembly for the motor according to the present invention.

[0023] Fig. 3 is a plan view illustrating the rotor assembly for the motor according to the present invention, and Fig. 4 is a front cross-sectional view illustrating the rotor structure for the motor according to the present invention.

[0024] Referring to the Fig. 1 to 3, the rotor structure for the motor according to the present invention includes a core body 100, field windings 200, and a core outer part 300.

[0025] A shaft 10 passes through the axial center of the core body 100, and webs are arranged radially along an outer peripheral surface of the core body 100. Each web includes a first sliding connection portion 121 at a front edge.

[0026] A shaft connection portion 110 is formed in the center of the core body 100 to allow the shaft 10 to pass through the core body 100 along an axial direction.

[0027] The shaft connecting portion 100 may have a cylindrical shape and be hollow according to the outer shape of the shaft 10 so that the shaft 10 can pass through the center of the shaft connecting portion 110 in the axial direction.

[0028] The first sliding connection portion 121 is a concave or hollow groove having a length corresponding to the core body 100 in the axial direction.

[0029] In addition, a width of the first sliding connection portion 121 may increase rearward from the open front end.

[0030] For example, in Fig. 3, the first sliding connection portions 121 and the second sliding connection portions 320 described later may have a triangular shape corresponding to a male / female structure.

[0031] That is, the first sliding connection portion 121 and the second sliding connection portion 320 have a connection structure that is connectable to each other in an axial direction but is inseparable from each other in a width direction, that is, a rotational direction.

[0032] The webs 120 are formed to protrude radially from the outer periphery of the shaft connecting portion 110. The webs 120 are formed to have a length of the shaft connecting portion 110 along the axial direction.

[0033] The webs 120 can be arranged at regular intervals along the outer circumference of the shaft connecting portion 110 and spacing portions 130 are formed between the webs 120.

[0034] The spacing regions 130 define spaces such that the field windings 200 are arranged in a state in which they are wound around the webs 120.

[0035] The field windings 200 are individually formed around the outer peripheries of the webs 120 and maintain a state in which they are spaced apart from each other when wound around the teeth 120.

[0036] As described above, the field windings 200 may be individually installed on the webs 120 in a state of being latched to the outer periphery of the shaft connecting portion 120 and an inner periphery of the core outer 300, as will be described later.

[0037] The core outer part 300 is connected to the core body 100 to surround the core body 100. The core outer part 300 includes the second sliding connection regions 320 formed along an inner circumference such that the end edges of the webs 120 are slidably connected thereto in the axial direction via a form fit.

[0038] The second sliding connection areas 320 are concave elevations which are designed to be slidably connected to the above-described first sliding connection areas 121 via a form fit.

[0039] The second sliding connection portion 320 has a shape corresponding to the first sliding connection portion, and a front edge of the second sliding connection portion 320 becomes wider in the protrusion direction.

[0040] As described above, the second sliding connection portion 320 has a connection structure that is connectable to the first sliding connection portion 121 in the axial direction but is inseparable from the first sliding connection portion 121 in the width direction, that is, in the rotational direction.

[0041] On the other hand, the first sliding connection portion 121 and the second sliding connection portion 320 may be integrally connected to each other by using a separate fastener (not shown) or an adhesive (not shown) when they are slidably connected via the mold fit.

[0042] In addition, the core outer part 300 may have a plurality of through holes 330 along a circumferential direction so that needles can be inserted over the pitch range of the webs 120 from the outside at a time of winding the field windings 200.

[0043] The plurality of through holes 330 are formed along an axial direction of the core outer part 300, and the number of through holes 330 is equal to the number of webs 120.

[0044] The through holes 330 may have a rectangular shape and a circumferential length of the core outer part 300. However, if necessary, the through holes 330 may be formed in different shapes.

[0045] In addition, a plurality of flat surfaces 310 on which the webs 120 are to be arranged may be formed at regular intervals along the inner peripheral surface of the core outer part 300, and the through holes 330 may be formed at adjacent areas of the flat surfaces 310.

[0046] Concave grooves 340 may also be formed in the inner peripheral surface of the core outer part 300 to have a length in the axial direction. The concave or recessed grooves 340 are thinner at the positions of the through holes 330.

[0047] The rotor assembly for the motor described above may be rotatably arranged in a cavity of a stator 400, as shown in the Fig. 3 and Fig.4 is shown.

[0048] According to the present invention, the field windings 200 are wound around the webs 120 in a state where the core body 100 is separated from the core outer part 300, and the webs 120 are slidably connected to the core outer part via the mold connection. Thus, the field windings 200 can be easily wound around the webs 120, and the assembly time can be reduced accordingly.

[0049] Since the core body 100 is connected to the core outer 300 in a direction perpendicular to a rotation direction, the core body 100 is difficult to separate from the core outer 300 by a centrifugal force generated by rotation, and a strong engagement force is obtained.

[0050] In addition, by integrally forming the core outer part 300, it is possible to avoid imbalance due to its shape, thereby improving the operating performance of the device, reducing the number of elements, and preventing leakage of the magnetic flux.

[0051] The rotor structure for the motor according to the present invention has been described, but it is obvious that various modifications can be made without departing from the scope of the present invention.

[0052] Therefore, the scope of the present invention should be defined not by the detailed description of the embodiments, but by the appended claims and their equivalents.

[0053] It should be understood that the above-described embodiments are exemplary in all aspects and are not intended to limit the scope of the present invention. It should be understood that the scope of the present invention is defined by the appended claims rather than by the detailed description, and all changes and modifications that can be derived from the spirit and scope of the claims and their equivalents are included within the scope of the present invention. DESCRIPTION OF REFERENCE SYMBOLS 10 Wave 110 Shaft connection area 121 first sliding connection area 200 field winding 310 flat surface 330 through hole 100 core bodies 120 bridges 130 distance range 300 core outer part 320 second sliding connection area 340 concave groove 400 Stator

Claims

[1] Rotor assembly for a motor, comprising: a core body (100) through which a shaft (10) extends in an axial center and on which webs (120) are arranged radially along an outer circumference and first sliding connection regions (121) are enclosed at end edges; Field windings (200) individually wound around the outer peripheries of the webs (120) and maintaining a state in which they are spaced apart from each other while being wound around the webs; and a cylindrical core outer part (300) which is designed to surround the outside of the core body (100), wherein the cylindrical core outer part (300) includes second sliding connection regions (320) on an inner circumference such that the end edges of the webs (120) are slidably connected thereto along an axial direction via form closure, characterized bythat the core outer part (300) has a plurality of through holes (330) formed along an axial direction of the core outer part (300). [2] Rotor assembly according to claim 1, wherein the first sliding connection portion (121) is a concave groove (340) which has a length of the core body (100) in the axial direction and widens rearward from an open front end; and a second sliding connection region (320) is a concave elevation which is slidably connected to the first sliding connection region (121) via a form fit. [3] A rotor structure according to claim 1 or 2, wherein the plurality of through holes (330) are formed along a circumferential direction so that needles can be inserted through clearance portions of the webs (120) from the outside at the time of winding the field windings (200). [4] A rotor structure according to any one of claims 1 to 3, wherein a plurality of flat surfaces on which the webs (120) are to be arranged are formed at regular intervals along an inner peripheral surface of the core outer part (300), and the through holes (330) can be formed at adjacent portions of the flat surfaces. [5] A rotor assembly according to any one of claims 1 to 4, further comprising concave grooves (340) in the inner peripheral surface of the core outer part (300), the concave grooves (340) having a length along an axial direction and being narrower at positions of the through holes (330). [6] A rotor assembly according to any one of claims 1 to 5, wherein the first sliding connection portion (121) and the second sliding connection portion (320) are integrally connected to each other by using a separate fastener or an adhesive when they have been slidably connected to each other by mold fitting.

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