Linear motor

Abstract

The utility model discloses a linear motor, which comprises a stator and a rotor, and the stator or the rotor comprises an iron core, a coil winding and a cooling pipe. The iron core comprises a yoke part and a plurality of tooth parts arranged on the yoke part. The coil winding comprises a plurality of coil units which are wound on the tooth parts respectively, and each coil unit comprises at least two layers of sub-coil units which are arranged at intervals in the extending direction of the tooth parts from the yoke part. The cooling pipe comprises a cooling section wound around the tooth part, and the cooling section is located between the two adjacent layers of sub-coil units of each coil unit and makes heat conduction contact with the two adjacent layers of sub-coil units. At least one of the opposing surfaces of the sub-coil unit and the cooling section is configured to have a planar extension. The enameled wire and the cooling pipe of the coil winding adopt a flat design, so that the heat exchange area of the enameled wire and the cooling pipe is increased, and the heat dissipation efficiency of the linear motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technical field, concretely relates to a linear motor. BACKGROUND

[0002] The coil winding and the cooling pipe of the linear motor are important components for realizing electromagnetic conversion, and largely determine the performance parameters of the linear motor.

[0003] The coil winding of the existing linear motor is generally formed by winding round wire enameled wire, and the gap of the adjacent two turns of the round wire enameled wire in a single coil winding is large, which leads to the waste of part of the space of the core slot of the motor, so that the slot fill factor of the motor is generally less than 65%, which seriously affects the performance of the motor.

[0004] The cooling pipe of the existing linear motor is generally made of a round pipe, and the contact area of the cooling pipe with the core or the coil winding is small, which seriously affects the heat dissipation efficiency.

[0005] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the overall background of the utility model, and should not be regarded as acknowledging or implying in any form that this information constitutes prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a linear motor, which is used to solve the problem of low slot fill factor and heat dissipation efficiency of the existing linear motor.

[0007] In order to achieve the above-mentioned purpose, one embodiment of the utility model provides a linear motor, which comprises a stator and a mover, and the stator or the mover comprises a core, a coil winding and a cooling pipe. The core comprises a yoke and a plurality of tooth portions arranged on the yoke. The coil winding comprises a plurality of coil units arranged on the tooth portions, and in the direction in which the tooth portion extends from the yoke, the coil unit comprises at least two layers of sub-coil units spaced from each other. The cooling pipe comprises a cooling section winding through the tooth portion, and the cooling section is located between the two layers of sub-coil units adjacent to each other, and is in thermal contact with the two layers of sub-coil units. At least one of the opposite surfaces of the sub-coil unit and the cooling section is configured to have a planar extension.

[0008] In one or more embodiments of the utility model, the sub-coil unit comprises two opposite contact surfaces, the contact surfaces are configured as planes, and at least one contact surface of the sub-coil unit is at least partially in thermal contact with the cooling section.

[0009] In one or more embodiments of the utility model, the cooling section comprises two opposite first heat dissipation surfaces, the first heat dissipation surfaces are configured as planes, and the first heat dissipation surfaces are at least partially in thermal contact with the sub-coil unit.

[0010] In one or more embodiments of the present application, the cooling section further comprises a second heat dissipation surface in at least partial heat conduction contact with the tooth portion, and the second heat dissipation surface comprises a plurality of planar sections in heat conduction contact with the peripheral edge of the tooth portion.

[0011] In one or more embodiments of the present application, the second heat dissipation surface further comprises a curved section connecting the adjacent two planar sections, and the curved section is configured as a chamfered surface, and the curved section is located at a peripheral corner of the tooth portion.

[0012] In one or more embodiments of the present application, the width of the enameled wire of the sub-coil unit is greater than its thickness, and the width of the cooling section is greater than its thickness.

[0013] In one or more embodiments of the present application, the adjacent two sub-coil units in the coil unit are connected in series with each other.

[0014] In one or more embodiments of the present application, the adjacent two sub-coil units in the coil unit are connected in series with each other through the terminal.

[0015] In one or more embodiments of the present application, the stator or the rotor further comprises an insulation structure covering the sub-coil units.

[0016] In one or more embodiments of the present application, the insulation structure comprises a main insulation layer and two end insulation layers, the main insulation layer is sleeved on the tooth portion, the main insulation layer is formed with two first accommodation cavities for accommodating part of the sub-coil units and arranged oppositely along the first direction, and the two end insulation layers are arranged on both sides of the main insulation layer along the second direction and are formed with two second accommodation cavities for accommodating part of the sub-coil units.

[0017] In one or more embodiments of the present application, the insulation structure is made of insulating paper.

[0018] Compared with the prior art, the enameled wire and the cooling pipe of the coil winding of the present application adopt a flat design, increase the heat exchange area of the two, and improve the heat dissipation efficiency of the linear motor.

[0019] In addition, the gap between the flat enameled wires in the coil unit is small, which can reduce the space waste in the core slot and improve the slot fill rate and motor performance of the linear motor.

[0020] In addition, after the coil unit is designed in layers, the cooling pipe can be arranged between the adjacent two sub-coil units, so that both sides of the cooling pipe can cool the sub-coil units, further increasing the heat exchange area of the sub-coil units and the cooling pipe. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described in the following are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0022] Figure 1 is a perspective view of the stator or the rotor of the linear motor in an embodiment of the present application;

[0023] Figure 2 is an exploded view of the stator or the rotor of the linear motor in an embodiment of the present application;

[0024] Figure 3 is an exploded view of the winding coil and the insulation structure in an embodiment of the present application;

[0025] Figure 4 is a perspective view of the cooling pipe in an embodiment of the present application;

[0026] Figure 5 is Figure 4 is a local enlarged view of part A in the figure.

[0027] Main figure mark explanation: 1, iron core, 11, part, 12, tooth part, 13, iron core slot, 2, coil winding, 21, coil unit, 211, sub-coil unit, 212, contact surface, 3, cooling pipe, 31, cooling section, 311, first radiating surface, 312, second radiating surface, 32, liquid inlet section, 33, liquid outlet section, 4, insulation structure, 41, main insulation layer, 411, first containing cavity, 42, end insulation layer, 421, second containing cavity. DETAILED DESCRIPTION

[0028] In order to make the person skilled in the art better understand the technical solutions in the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0029] In the description of the utility model, it is understood that the terms "top", "bottom", "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] The term "first direction" is the arrangement direction of the tooth portion of the core, and the "second direction" is perpendicular to the "first direction" and perpendicular to the height direction of the tooth portion.

[0031] The terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0032] In an embodiment, referring to Figures 1 to 5 The embodiment provides a linear motor, which comprises a stator and a mover, the stator comprises a core 1, a plurality of coil windings 2, a cooling pipe 3 and a plurality of insulation structures 4.

[0033] Specifically, the core 1 comprises a yoke portion 11 and a plurality of tooth portions 12, the yoke portion 11 extends along a first direction, the plurality of tooth portions 12 are arranged on the same surface of the yoke portion 11 along the first direction, and an iron core slot 13 is formed between adjacent two tooth portions 12. The coil winding 2 comprises a plurality of coil units 21 wound on the tooth portion 12 respectively, and in the direction in which the tooth portion 12 extends from the yoke portion 11, the coil unit 21 comprises at least two layers of sub-coil units 211 spaced from each other. The cooling pipe 3 comprises a cooling section 31 winding through the tooth portion 12, and the cooling section 31 is located between adjacent sub-coil units 211 of each coil unit 21 and is in thermal contact with the adjacent sub-coil units 211. The plurality of insulation structures 4 are correspondingly coated on the sub-coil units 211 to insulate and protect the sub-coil units 211 from contacting the core 1. At least one of the opposite surfaces of the sub-coil unit 211 and the cooling section 31 is configured to have a planar extension portion, so as to reduce the gap between the sub-coil unit 211 and the cooling section 31, reduce the thermal conduction distance therebetween, and improve the cooling efficiency of the cooling pipe 3 on the coil winding 2.

[0034] It should be understood that the sub-coil unit 211 is coated with an insulating structure 4, and the heat-conducting contact between the sub-coil unit 211 and the cooling section 31 is indirect. In other alternative embodiments, the sub-coil unit 211 and the cooling section 31 can also be in direct contact, provided that insulation measures are taken. Alternatively, other heat-conducting structures can also be provided between the sub-coil unit 211 and the cooling section 31 to assist heat dissipation.

[0035] In an embodiment, referring to Fig. 1, the sub-coil unit 211 is formed by winding a flat wire. The cross-section of the flat wire is not circular, but flat and similar to a rectangle. The width of the flat wire is greater than its thickness. The flat wire is stacked in the thickness direction to form the sub-coil unit 211. Figure 3

[0036] Further, the sub-coil unit 211 is provided with two oppositely arranged contact surfaces 212, and the contact surfaces 212 and the cooling section 31 exchange heat through the insulating structure 4. The contact surfaces 212 are generally flat, which increases the heat exchange area between the sub-coil unit 211 and the cooling section 31 and improves the heat dissipation efficiency of the sub-coil unit 211. Moreover, the gap between the flat wires is small or almost non-existent, which reduces the space waste in the core slot 13 and improves the slot fill factor and motor performance of the linear motor.

[0037] In addition, for the two layers of sub-coil units 211 at the ends of the coil unit 21, when the cooling pipe 3 is not provided at the two ends of the coil unit 21, only one contact surface 212 of the two layers of sub-coil units 211 at the ends is in heat-conducting contact with the cooling section 31.

[0038] In an embodiment, referring to Fig. 1, the two layers of sub-coil units 211 in the coil unit 21 are connected in series. In actual applications, the coil unit 21 can be wound in a parallel manner, and the two layers of sub-coil units 211 can be connected in series without a connection head. Figure 3 In addition, the winding method of the coil unit 21 is not limited to the parallel winding method. The two layers of sub-coil units 211 can also be wound separately and then connected in series by a connection head. Alternatively, the two layers of sub-coil units 211 can also be connected separately and then led out to the cable connection end of the linear motor. The two sets of winding connections can be combined inside the linear motor and then connected in series, or the cable lead-out wires of the two layers of sub-coil units 211 can be directly led out from the outgoing end of the linear motor and then connected in series.

[0039] In an embodiment, referring to Fig. 1, the two layers of sub-coil units 211 in the coil unit 21 are connected in series. In actual applications, the coil unit 21 can be wound in a parallel manner, and the two layers of sub-coil units 211 can be connected in series without a connection head.

[0040] Figure 3 ​​As shown, each coil unit 21 comprises two layers of sub-coil units 211, and a cooling section 31 is arranged between the two layers of sub-coil units 211.

[0041] In other embodiments, each coil unit 21 can also comprise more than three layers of sub-coil units 211, and a cooling section 31 is arranged between any two adjacent layers of sub-coil units 211. In this case, the cooling pipe 3 comprises more than two cooling sections 31, which can be arranged independently, in series or in parallel.

[0042] In an embodiment, as shown in Figure 2 , Figure 4 and Figure 5 , the cooling section 31 is configured as a flat serpentine coil pipe, and the cross-sectional shape of the cooling section 31 is similar to the cross-sectional shape of the flat wire. The cooling section 31 is configured as a flat shape similar to a rectangle, so that the width of the cooling section 31 is greater than its thickness.

[0043] Further, the cooling section 31 is formed with two first heat dissipation surfaces 311 arranged oppositely, and the first heat dissipation surfaces 311 are in thermal contact with the contact surfaces 212 of the coil unit 21. The first heat dissipation surfaces 311 are configured as flat surfaces to increase the heat exchange area between the cooling section 31 and the sub-coil units 211. The first heat dissipation surfaces 311 can be in complete thermal contact with the contact surfaces 212 of the sub-coil units 211 through the insulation structure 4. Alternatively, the first heat dissipation surfaces 311 can be in partial thermal contact with the contact surfaces 212 of the sub-coil units 211.

[0044] Further, the cooling section 31 further comprises a second heat dissipation surface 312 in thermal contact with the tooth portion 12 of the core 1, and the second heat dissipation surface 312 comprises a plurality of flat sections and a plurality of curved sections. The flat sections are correspondingly arranged towards the side surfaces of the tooth portion 12 to increase the heat exchange area between the cooling section 31 and the tooth portion 12 of the core 1. The curved sections are chamfered surfaces connecting adjacent two flat sections, and the curved sections are located at the peripheral corners of the tooth portion 12, which represent the side edges or peripheral chamfers of the tooth portion 12.

[0045] In an embodiment, as shown in Figure 2 and Figure 4 , the cooling pipe 3 further comprises a liquid inlet section 32 and a liquid outlet section 33 connected with the cooling section 31, and the liquid inlet section 32 and the liquid outlet section 33 are configured as straight pipe structures, and the cross-sectional shape of the liquid inlet section 32 and the liquid outlet section 33 is consistent with the cross-sectional shape of the cooling section 31.

[0046] In an embodiment, as shown in Figure 3As shown, the insulation structure 4 includes a main insulation layer 41 and two end insulation layers 42, the main insulation layer 41 is sleeved on the tooth portion 12 of the core 1, the main insulation layer 41 is formed with two first accommodating cavities 411 oppositely arranged in the first direction, the two first accommodating cavities 411 are used for accommodating part of the sub-coil unit 211, and the two end insulation layers 42 are arranged on the two sides of the main insulation layer 41 in the second direction and form two second accommodating cavities 421, the two second accommodating cavities 421 are used for accommodating part of the sub-coil unit 211.

[0047] Further, the insulation structure 4 is made of insulation paper.

[0048] In an embodiment, the structure of the rotor is the same as, similar to, partially the same as, or partially similar to the structure of the stator.

[0049] In another embodiment, the structure of the rotor can also be different from the structure of the stator, and only one of the stator and the rotor adopts the structure design in the above embodiment.

[0050] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the involved claims.

[0051] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A linear motor, characterized in that, The linear motor includes a stator and a mover, wherein the stator or mover includes: The iron core (1) includes a yoke (11) and a plurality of teeth (12) disposed on the yoke (11); The coil winding (2) includes a plurality of coil units (21) respectively wound on the teeth (12). In the direction extending from the yoke (11) of the teeth (12), the coil unit (21) includes at least two layers of sub-coil units (211) spaced apart from each other. The cooling tube (3) includes a cooling section (31) that passes around the tooth (12), the cooling section (31) being located between two adjacent sub-coil units (211) of each coil unit (21) and in thermal contact with the two adjacent sub-coil units (211); In this embodiment, at least one of the opposing surfaces of the sub-coil unit (211) and the cooling section (31) is configured to have a planar extension portion.

2. The linear motor according to claim 1, characterized in that, The sub-coil unit (211) includes two opposing contact surfaces (212), the contact surfaces (212) being configured as planes, and at least one contact surface (212) of the sub-coil unit (211) being in at least partial thermal contact with the cooling section (31).

3. The linear motor according to claim 1, characterized in that, The cooling section (31) includes two first heat dissipation surfaces (311) arranged opposite to each other. The first heat dissipation surfaces (311) are configured as planes and are at least partially in thermal contact with the sub-coil unit (211).

4. The linear motor according to claim 1, characterized in that, The cooling section (31) further includes a second heat dissipation surface (312) that is at least partially in thermal contact with the tooth (12), the second heat dissipation surface (312) including a plurality of planar segments that are in thermal contact with the periphery of the tooth (12).

5. The linear motor according to claim 4, characterized in that, The second heat dissipation surface (312) also includes a curved surface segment connecting two adjacent planar segments. The curved surface segment is constructed as a chamfered surface and is located at the peripheral corner of the tooth (12).

6. The linear motor according to claim 1, characterized in that, The width of the enameled wire of the sub-coil unit (211) is greater than its thickness, and the width of the cooling section (31) is greater than its thickness.

7. The linear motor according to claim 1, characterized in that, The two adjacent sub-coil units (211) in the coil unit (21) are connected in series.

8. The linear motor according to claim 7, characterized in that, Two adjacent sub-coil units (211) in the coil unit (21) are connected together in series by a connector.

9. The linear motor according to claim 1, characterized in that, The stator or mover also includes an insulation structure (4) covering the sub-coil unit (211).

10. The linear motor according to claim 9, characterized in that, The insulation structure (4) includes a main insulation layer (41) and two end insulation layers (42). The main insulation layer (41) is sleeved on the tooth (12). Two first receiving cavities (411) are formed on the main insulation layer (41) and are arranged opposite each other along a first direction for accommodating a portion of the sub-coil unit (211). The two end insulation layers (42) are arranged on both sides of the main insulation layer (41) along a second direction and form two second receiving cavities (421) for accommodating the portion of the sub-coil unit (211); and / or, The insulation structure (4) is made of insulating paper.

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