Motor and electric compressor provided with motor

Abstract

The invention provides a motor and an electric compressor provided with the motor. A lead part of a coil led out from a slot can be bundled and stably fixed to an insulator without using a rope. The motor includes a stator (21) having a stator core (22), an insulator (33) provided on the stator core (22), and a coil (23) wound around each tooth of the stator core (22) via the insulator (33), and a lead portion (25) of the coil (23) led out from each slot between the teeth is fixed to the insulator (33) in a state of being bundled along a circumferential direction of the stator core (22). The lead portion (25) of the coil (23) is bundled and fixed to the insulator (33) by the lead portion (25) of the coil (23) led out from another slot.

Description

Technical Field

[0001] The present invention relates to an electric motor having a stator with coils wound around it and an electric compressor having the motor. Background Technology

[0002] Conventionally, electric compressors used in the refrigeration cycle of vehicle air conditioning systems, such as those used for air conditioning the interior of vehicles, are constructed by housing a compressor component, such as a scroll compressor, and a motor that drives the compressor component within a container. In this case, the motor has a stator in which the coils of each phase (UVW) are wound around multiple teeth of the stator core via insulators.

[0003] Furthermore, the lead portions of multiple coils (the ends of the coils connected to the three-phase terminals for power supply) that are led out from the slots between the teeth (for example, see Patent Document 1) were conventionally tied and fixed to the insulator with ropes at predetermined intervals. Existing technical documents

[0004] Patent Document 1: Japanese Patent No. 7075376

[0005] This method, which previously used ropes to bind the leads of the coils leading out of each slot, resulted in an increase in the number of components and thus higher costs. Furthermore, in the structure of Patent Document 1, the leads are only hooked onto the insulator, so the vertical movement of the leads caused by vibration or other factors cannot be completely restrained. Summary of the Invention

[0006] In order to solve the aforementioned prior art problems, the object of the present invention is to provide an electric motor and an electric compressor equipped with the electric motor, which can securely fix the lead portion of the coil leading out of the slot to the insulator without using rope.

[0007] The electric motor of the present invention includes a stator having a stator core, an insulator disposed on the stator core, and coils wound around the teeth of the stator core by means of the insulator. The lead portions of the coils, which are respectively led out from the slots between the teeth, are fixed to the insulator in a state of being bundled along the circumference of the stator core. The characteristic feature is that the lead portions of the coils are bundled and fixed to the insulator by means of lead portions of the coils led out from other slots.

[0008] The motor of the invention of method 2 is characterized in that a fixing part is formed on the outer peripheral wall of the insulator, the fixing part being used to lock the lead part of the coil that is led out from other slots and used to bind the lead part of the coil.

[0009] In the invention described above, the motor of method 3 is characterized in that the coils of different phases are adjacent to and distributed circumferentially on the teeth of the stator core, and the lead portion of the coil is bundled and secured to the fixing portion of the insulator by the lead portion of the coil drawn from other slots with one or more adjacent phases.

[0010] The motor of the invention of method 4 is characterized in that the lead portion of the coil is bundled and secured to the fixing portion of the insulator by means of the lead portion of the coil leading out from all slots.

[0011] The electric compressor of Method 5 is constructed by housing the motor and compression component of each of the above inventions inside a container.

[0012] According to the present invention, the motor includes a stator having a stator core, an insulator disposed on the stator core, and coils wound around the teeth of the stator core by means of the insulator. The lead portions of the coils, which are respectively led out from the slots between the teeth, are fixed to the insulator in a state of being bundled along the circumference of the stator core. Since the lead portions of the coils are bundled and fixed to the insulator by means of the lead portions of the coils led out from other slots, it is not necessary to use ropes to bundle the lead portions, thereby reducing the number of parts and reducing costs.

[0013] In particular, as shown in the invention of method 2, a fixing part for securing the lead portion of the coil drawn from other slots is formed on the outer peripheral wall of the insulator, which is used to bind the lead portion of the coil, so that the bound lead portion can be easily and stably fixed to the insulator.

[0014] In this case, as shown in the invention of method 3, when coils of different phases are adjacent to and distributed circumferentially on the teeth of the stator core, the lead portion of the coil drawn from the slot through one or more adjacent phases is used to bundle and fix it to the fixing part of the insulator, so that the number of bundling and fixing parts is not excessively increased, and the fixing can be stably performed.

[0015] Furthermore, as shown in the invention of method 4, by bundling the lead portion of the coil with the lead portion of the coil leading out from all slots and securing it to the fixing portion of the insulator, the lead portion of the coil can be fixed very stably.

[0016] Moreover, as shown in the invention of method 5, by housing the motor and compression component of each of the above inventions inside a container to form an electric compressor, it is possible to make an inexpensive electric compressor with fewer malfunctions. Attached Figure Description

[0017] Figure 1 This is a longitudinal sectional side view of an electric compressor applying one embodiment of the present invention. Figure 2 It constitutes Figure 1An exploded 3D view of the stator of the motor. Figure 3 It means Figure 2 An enlarged 3D view of the main part of the motor (the lead part of the coil). Detailed Implementation

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The electric compressor 1 of the embodiment is a scroll compressor in which a scroll compressor component 3 and the motor 4 of the present invention are housed within a container 2. The scroll compressor component 3 includes a fixed scroll disk 6 fixed to the container 2 and a movable scroll disk 7 that revolves relative to the fixed scroll disk 6 via a rotating shaft 8 of the motor 4, and is configured such that a vortex-shaped scroll 11 formed on the fixed scroll disk 6 engages with a vortex-shaped scroll 12 formed on the movable scroll disk 7.

[0019] Refrigerant is introduced into container 2 through a refrigerant inlet channel (not shown), and is drawn in from the outside into the compression chamber formed between the two scrolls 11 and 12. This compression chamber narrows towards the center due to the revolution of the movable scroll 7, so the drawn-in refrigerant is compressed and discharged from the center through the discharge chamber 14 and the refrigerant discharge channel (not shown). Furthermore, because the pressure inside container 2 becomes low, the refrigerant also passes around the motor 4, resulting in the motor 4 being cooled by the refrigerant.

[0020] Next, the motor 4 of the present invention will be described. The motor 4 of the embodiment is a three-phase permanent magnet synchronous motor, which is composed of a stator 21 and a rotor 24. The stator 21 is composed of a stator core 22, a coil 23 and an insulator 33. The insulator 33 is a winding tube shaped by an insulator. The magnet-embedded rotor 24 (composed of multiple electromagnetic steel plates stacked together) is fixed to the rotating shaft 8 and rotates inside the stator 21.

[0021] In this embodiment, the stator core 22 of the stator 21 is formed as a two-part structure with an inner core 26 (inner core) and an outer core 28 (outer core). The inner core 26 has a plurality of teeth 27 (the number corresponding to the number of poles; 12 in this embodiment). The front ends 27A of adjacent teeth 27 of the inner core 26 are connected by bridging portions 29 to form a continuous structure. As a result, the slots 31 (12 in this embodiment) between the teeth 27 of the inner core 26 form a shape that is open in the outward direction and closed in the central direction.

[0022] The inner core 26 and outer core 28 are constructed by stacking and combining multiple electromagnetic steel plates. Furthermore, the inner side of the outer core 28 has the same number of fitting recesses 32 as the teeth 27 of the inner core 26. Additionally, the coil 23 is pre-wound onto an insulator 33 in the shape of a winding tube made of insulator, and mounting holes 34 are formed in the insulator 33 for inserting the teeth 27 of the inner core 26.

[0023] Furthermore, when assembling the stator 21, the inner core 26 and the outer core 28 are first formed by stacking and combining electromagnetic steel plates. In addition, the coil 23 is wound around the insulator 33, and 12 of these components are prepared. Next, the insulator 33 is installed from the outside onto all the teeth 27 by inserting the teeth 27 of the inner core 26 into the mounting holes 34 of each insulator 33 on which the coil 23 is wound (a total of 12 insulators are installed).

[0024] Thus, with the help of the insulator 33, the coil 23 is wound onto the inner iron core 26 (stator 21). Next, the inner iron core 26 with the coil 23 installed is embedded into the outer iron core 28. At this time, by making the outer ends of each tooth 27 of the inner iron core 26 engage with each engaging recess 32 of the outer iron core 28, the inner iron core 26 and the outer iron core 28 become an integral unit.

[0025] Furthermore, the coils 23 of each insulator 33 are wired in a manner that constitutes a predetermined circuit. Moreover, the lead portion (one end) 25 of the coil 23 extending from each slot 31... Figure 3 After being bundled as described below, it is connected to a three-phase terminal (not shown) and connected to the inverter 30 (located at the end of the housing 2 on the opposite side of the motor 4 from the scroll compressor component 3) via the three-phase terminal. Figure 1 The inverter 30 supplies power to the inverter.

[0026] Thus, in the stator 21 of the embodiment, the front end 27A of the tooth 27 is continuous, and the coil 23 is installed from the outside into the slot 31 that opens to the outside. Therefore, compared with a motor that inserts the nozzle from the gap at the front end of the tooth and directly winds the coil, the coil density is increased, and the performance can be improved.

[0027] Furthermore, the front end 27A of each tooth 27 is continuous through the bridging portion 29, thereby increasing the rigidity of the inner core 26. As a result, the deformation of the stator core 22 of the stator 21 caused by the reaction force accompanying the rotation of the rotor 24 is also reduced, which has the advantage of suppressing vibration.

[0028] Next, refer to Figure 2 and Figure 3 This describes the structure for bundling and fixing the lead portion 25 of coil 23. Figure 2 This is an exploded 3D view of the stator 21 as seen from the inverter 30 side. Figure 3 This is also a three-dimensional view of the stator 21 as seen from the inverter 30 side.

[0029] In the figures, 36 is a slit-like fixing part formed on the outer peripheral wall of each insulator 33. In this embodiment, the fixing part 36 is formed by a slit, but it may also be formed by a through hole or a protrusion.

[0030] Furthermore, with all insulators 33 installed in their respective teeth 27, the coils 23 wound around each insulator 33 are connected in a manner that constitutes the UVW phases of the motor 4. In this case, four of the twelve insulators 33 are U-phase, four of the remaining insulators are V-phase, and the remaining four are W-phase, for example, according to... Figure 3 The phases are arranged in a clockwise direction around the perimeter as follows: U phase, W phase, V phase, U phase, W phase, V phase, U phase, W phase, V phase, U phase, W phase, V phase.

[0031] exist Figure 3 This was expressed in an easily understandable way. Figure 3 This indicates that among the insulators 33, the first U-phase insulator is 33U1, the second U-phase insulator is 33U2, the third U-phase insulator is 33U3, and the fourth U-phase insulator is 33U4. Furthermore, it indicates that the first W-phase insulator is 33W1, the second W-phase insulator is 33W2, the third W-phase insulator is 33W3, and the fourth W-phase insulator is 33W4. Also, it indicates that the first V-phase insulator is 33V1, the second V-phase insulator is 33V2, the third V-phase insulator is 33V3, and the fourth V-phase insulator is 33V4.

[0032] Furthermore, the other ends (the ends on the vortex compression member 3 side) of the coils 23 constituting each of the four insulators 33 in each phase are connected to each other. That is, the other ends of the four coils 23 constituting the U phase are connected to each other, the other ends of the four coils 23 constituting the V phase are also connected to each other, and the other ends of the four coils 23 constituting the W phase are also connected to each other.

[0033] Furthermore, one end of the coil 23 of each phase becomes the aforementioned lead portion 25 and is led out from each slot 31. Here, although in Figure 3 There are parts that are obscured, but... Figure 3 The lead portion of coil 23 of insulator 33U1 is 25U1, the lead portion of coil 23 of insulator 33U2 is 25U2, the lead portion of coil 23 of insulator 33U3 is 25U3, and the lead portion of coil 23 of insulator 33U4 is 25U4.

[0034] In addition, Figure 3 The lead portion of coil 23 of insulator 33W1 is 25W1, the lead portion of coil 23 of insulator 33W2 is 25W2, the lead portion of coil 23 of insulator 33W3 is 25W3, and the lead portion of coil 23 of insulator 33W4 is 25W4.

[0035] Moreover, in Figure 3The lead portion of coil 23 of insulator 33V1 is 25V1, the lead portion of coil 23 of insulator 33V2 is 25V2, the lead portion of coil 23 of insulator 33V3 is 25V3, and the lead portion of coil 23 of insulator 33V4 is 25V4. Each lead portion 25 extends from its respective slot 31 and runs along... Figure 3 The circumference rotates clockwise and eventually converges at pipes 37U, 37V, and 37W according to the phases.

[0036] At this point, in the embodiment, after the lead portion 25U1 surrounds the multiple lead portions 25 that are drawn from other slots 31, it passes through the fixing portion 36 of the insulator 33U1, and then along... Figure 3 The multiple lead wires 25 extending from other slots 31 through the insulator 33U1 are bound together by the lead wires 25U1 (lead wires extending from other slots 31 in this invention) surrounding them. Moreover, the lead wires 25U1 pass through the fixing part 36 and are locked therein, thus the multiple lead wires 25 are fixed to the insulator 33U1.

[0037] Furthermore, the lead portion 25V1, which is one phase away from the insulator 33U1 in the circumferential direction, also passes around the multiple lead portions 25 that are led out from other slots 31, passes through the fixing portion 36 of the insulator 33V1, and then along... Figure 3 The multiple lead wires 25 extending from other slots 31 through the insulator 33V1 are bound together around them by the lead wires 25V1 (lead wires extending from other slots 31 in this invention). Moreover, the lead wires 25V1 pass through the fixing part 36 and are locked therein, thus fixing the multiple lead wires 25 to the insulator 33V1.

[0038] Furthermore, the lead wire portion 25W2, which is one phase away from insulator 33V1 in the circumferential direction, also passes around the multiple lead wire portions 25 that are led out from other slots 31 passing through this location, passes through the fixing portion 36 of insulator 33W2, and then along... Figure 3 The multiple lead wires 25 extending from other slots 31 through the insulator 33W2 are bound together by the lead wires 25W2 (lead wires extending from other slots 31 in this invention) surrounding them. Moreover, the lead wires 25W2 pass through the fixing part 36 and are locked therein, thus fixing the multiple lead wires 25 to the insulator 33W2.

[0039] Furthermore, the lead wire portion 25U3, which is one phase away from the insulator 33W2 in the circumferential direction, also passes around the multiple lead wire portions 25 that are led out from other slots 31 passing through this location, passes through the fixing portion 36 of the insulator 33U3, and then along... Figure 3 The circumference is clockwise. Multiple lead wires 25 extending from other slots 31 through the insulator 33U3 are bound together by the lead wires 25U3 (lead wires extending from other slots 31 in this invention) surrounding them. Moreover, the lead wires 25U3 pass through the fixing part 36 and are locked therein, thus the multiple lead wires 25 are fixed to the insulator 33U3.

[0040] Furthermore, the lead portion 25V3, which is one phase away from the insulator 33U3 in the circumferential direction, also passes around the multiple lead portions 25 that are led out from other slots 31, passes through the fixing portion 36 of the insulator 33V3, and then along... Figure 3 The multiple lead wires 25 extending from other slots 31 through the insulator 33V3 are bound together around them by the lead wires 25V3 (lead wires extending from other slots 31 in this invention). Moreover, the lead wires 25V3 pass through the fixing part 36 and are locked therein, thus fixing the multiple lead wires 25 to the insulator 33V3.

[0041] In this way, the lead portion 25 of the coil 23, which is drawn out from each slot 42 between the teeth 27, is fixed to the insulator 33 in a state of being bundled along the circumference of the stator core 22.

[0042] In the present invention as described above, the lead portion 25 of the coil 23 is bundled and fixed to the insulator 33 by means of the lead portion 25 of the coil 23 drawn from other slots 31, so there is no need to use rope to bundle the lead portion 25, thereby reducing the number of parts and reducing costs.

[0043] In particular, in the embodiment, a fixing part 36 is formed on the outer peripheral wall of the insulator 33 for locking the lead part 25 of the coil 23 that is led out from the other slot 31 to bind the lead part 25 of the coil 23. Therefore, the bound lead part 25 can be easily and stably fixed to the insulator 33.

[0044] Here, in the embodiment, coils 23 of different phases are adjacent to and distributed circumferentially on the teeth 27 of the stator core 22. However, in the embodiment, the lead portion 25 of the coil 23 led out from the slot 31 of the adjacent phase is used to bundle and lock it to the fixing portion 26 of the insulator 33. Therefore, the number of bundled and fixed parts is not excessively increased, and the fixing can be stably performed.

[0045] Furthermore, in the embodiment, by housing the motor 4 and the scroll compressor 3 inside the container 2 to form the electric compressor 1, an inexpensive electric compressor 1 with fewer malfunctions can be obtained.

[0046] In another embodiment, the lead portion 25 of the coil 23 is bundled and secured to the fixing portion 26 of the insulator 33 using the lead portion 25 of the coil 23 drawn from other slots 31 with one adjacent phase in between. However, in inventions other than embodiment 4, this is not the only limitation. The lead portion 25 of the coil 23 drawn from other slots 31 with two or more adjacent phases in between can be bundled and secured to the fixing portion 26 of the insulator 33.

[0047] Furthermore, in inventions other than Method 3, the lead portion 25 of the coil 23 can be bundled and secured to the fixing portion 26 of the insulator 33 using the lead portions 25 of the coil 23 leading from all slots 31. As the lead portion 25 of the coil 23 leading from the slot 31 passes through other slots 31, it is bundled and secured to the fixing portion 26 of the insulator 33 in all slots 31, thereby securing the lead portion 25 to the insulator 33 extremely stably.

[0048] Furthermore, in the embodiments, the present invention is applied to motor 4 of the following type: stator core 22 is composed of inner core 26 and outer core 38, and coil 23 is pre-wound on insulator 33 in the shape of a winding tube and installed on the teeth 27 of inner core 26. However, it is not limited to this. The present invention is also effective in motors of the following type: a direct-wound type motor in which an insulator of the same shape is installed at the end of a stator core integrally formed by an annular base and teeth protruding inward from the base, and the coil 23 is wound by means of the insulator or insulating paper.

[0049] Furthermore, in the embodiments, the present invention is used for scroll electric compressors, but it is not limited thereto. The motor 4 of the present invention can be applied to various electric compressors such as rotary electric compressors. Explanation of reference numerals in the attached figures

[0050] 1 Electric compressor 2 containers 3. Scroll compression component 4 motors 21 Stator 22 Stator Core 23 coils 24 rotors 25 Lead section 26 Inner Iron Core 27 teeth 28 outer iron core 31 slots 33 Insulators 36. Fixing part.

Claims

1. An electric motor comprising a stator having a stator core, an insulator disposed on the stator core, and coils wound around teeth of the stator core via the insulator, wherein lead portions of the coils extending from slots between the teeth are fixed to the insulator in a bundled manner along the circumference of the stator core, characterized in that, The lead portion of the coil is bundled and fixed to the insulator using the lead portion of the coil drawn from the other slots.

2. The motor according to claim 1, characterized in that, A fixing portion is formed on the outer peripheral wall of the insulator, which is used to lock the lead portion of the coil that is led out from the other slots and used to bind the lead portion of the coil.

3. The motor according to claim 2, characterized in that, The coils of different phases are adjacent to and distributed circumferentially across the teeth of the stator core. Furthermore, the lead portion of the coil is bundled and secured to the fixing portion of the insulator by using the lead portion of the coil drawn from the other slots across one or more adjacent phases.

4. The motor according to claim 2, characterized in that, The lead portion of the coil is bundled and secured to the fixing portion of the insulator using the lead portion of the coil leading out from all the slots.

5. An electric compressor, characterized in that, It is constructed by housing the motor and compression component as described in any one of claims 1 to 4 inside a container.

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