Switched Reluctance Motor

Abstract

The present invention provides a switched reluctance motor, which includes a motor main body and a stator. The opening width of the iron core slot is smaller than the bottom width of the slot. By fixedly arranging a ventilation body at the bottom of the iron core slot, the ventilation body includes two side plates protruding into the iron core slot, and a ventilation duct with a sealed outer periphery is formed between the two side plates. The through direction of the ventilation duct is parallel to the through direction of the iron core slot, the side plates are parallel to the side walls of the adjacent iron core slots, and windings are fixedly arranged between the side plates and the side walls of the adjacent iron core slots. The arrangement of the ventilation body can avoid blocking the ventilation duct during the dipping process of the windings, ensure the smoothness of the ventilation duct, thereby accelerating the heat dissipation of the windings, avoiding the use of manufacturing or use methods with relatively high costs such as controlling the thermal parameters of the motor, using low-loss silicon steel sheets, high-temperature-resistant insulation materials, filling the slots with glue, and using large-volume fans, improving the user recognition. Moreover, on the basis of ensuring the heat dissipation effect, it is not necessary to perform segmented design on the iron core, improving the effective utilization rate of materials and further reducing the production cost of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of power devices, and particularly to a switched reluctance motor. Background Art

[0002] Compared with traditional asynchronous or permanent magnet motors, switched reluctance motors have characteristics such as fewer stator slots, larger slot shapes, concentrated windings, and large voids in the slots, which in turn lead to relatively difficult heat dissipation of the windings when the motor is running. If the problem of difficult heat dissipation of the windings cannot be solved, the temperature of the motor will rise, and phenomena such as burning out the motor will occur.

[0003] Currently, methods to improve the heat dissipation of switched reluctance motors include: controlling the design of motor thermal parameters, using low-loss silicon steel sheets, applying high-temperature-resistant insulation materials, filling the voids in the slots with glue, and using fans with large air volumes, etc. These methods all have a certain effect on improving the motor temperature rise and heat resistance performance, but they will bring an obvious increase in manufacturing costs and maintenance costs during the later use process, thereby reducing the user recognition. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a switched reluctance motor, including a motor main body and a stator.

[0005] The stator is disposed within the motor main body and includes a stator core, a ventilation body, and a winding.

[0006] A plurality of through iron core slots are uniformly formed on the inner side of the stator core, and the opening width of the iron core slots is smaller than the bottom width.

[0007] The ventilation body is fixed to the bottom of the iron core slot and includes two side plates protruding into the iron core slot; a ventilation duct with a sealed outer periphery is formed between the two side plates, and the ventilation duct is parallel to the through direction of the iron core slot.

[0008] The side plate is parallel to the side wall of the adjacent iron core slot; the winding is fixed between the side plate and the side wall of the adjacent iron core slot.

[0009] Further, the ventilation body further includes a bottom plate, and the edges of the two side plates are respectively fixed to the opposite two sides of the bottom plate, and a ventilation duct with a sealed outer periphery is formed between the two side plates and the bottom plate.

[0010] Further, the ventilation body is a hollow columnar structure with a triangular cross-section formed by enclosing the two side plates and the bottom plate.

[0011] Further, the stator core is formed by stacking a plurality of iron core sheets; through holes corresponding to each other are formed in each iron core sheet, and the rod portion of a fastener is passed through the through holes, and the stator core is fixedly connected by the fastener.

[0012] Furthermore, a first card slot is provided at the bottom of the iron core slot, and the bottom of the ventilation body is inserted into the first card slot.

[0013] Furthermore, the opening width of the first card slot is smaller than the bottom width of the slot, and the shape of the bottom of the ventilation body is adapted to the shape of the first card slot to prevent it from falling out of the first card slot.

[0014] Furthermore, an insulating slot wedge is provided at the opening of the iron core slot, and the insulating slot wedge covers the winding.

[0015] Furthermore, second card slots are opened at both side walls of the iron core slot near the opening, and the edges of the insulating slot wedge are snapped into the second card slots.

[0016] Furthermore, the cross-section of the iron core slot is trapezoidal, the cross-section of the winding is rectangular, and both side surfaces of the winding are respectively close to the side plate and the side wall of the iron core slot.

[0017] As can be seen from the above technical solutions, the present invention has at least the following advantages and positive effects:

[0018] The present invention provides a switched reluctance motor. By respectively arranging a winding with a rectangular cross-section near both side walls in a trapezoidal iron core slot, and arranging a ventilation body between the two windings and the bottom surface of the iron core slot, the two side plates of the ventilation body are closely attached to the two windings and a ventilation duct is formed between the two side plates. The arrangement of the ventilation body can avoid blocking the ventilation duct in the winding dipping process, ensure the smoothness of the ventilation duct, thereby accelerating the heat dissipation of the winding, avoiding the use of manufacturing or use methods with relatively high costs such as low-loss silicon steel sheets, high-temperature-resistant insulating materials, and large-air-volume fans, and moreover, without the need for segmented design of the iron core on the basis of ensuring the heat dissipation effect, improving the effective utilization rate of materials and further reducing the production cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the front view of the stator with partial section in an embodiment of the present invention.

[0020] Figure 2 is a schematic diagram of the front view of the stator core in an embodiment of the present invention.

[0021] Figure 3 is Figure 2 a partially enlarged schematic diagram.

[0022] Figure 4 is a schematic diagram of the front view of the ventilation body in an embodiment of the present invention.

[0023] Figure 5 is Figure 1 a partially enlarged schematic diagram.

[0024] Figure 6 It is a schematic cross-sectional side view structure diagram of a stator core in an embodiment of the present invention.

[0025] Figure 7 It is a schematic cross-sectional side view structure diagram of a stator in an embodiment of the present invention.

[0026] Explanation of reference numerals is as follows: 1. Stator core; 11. Core slot; 111. First card slot; 112. Second card slot; 12. Through hole; 2. Ventilation body; 21. Side plate; 22. Bottom plate; 23. Ventilation duct; 3. Winding; 4. Insulating slot wedge. Detailed implementation manners

[0027] Typical implementation manners reflecting the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different implementation manners, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. 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 present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] An embodiment of the present invention provides a switched reluctance motor, which includes a motor body and a stator. Among them, the motor body refers to other main functional parts except the stator. The stator is fixedly arranged inside the housing of the motor body.

[0031] Referring to Figure 1 and Figure 2 , the stator includes a stator core 1, a ventilation body 2, a winding 3, and a slot wedge 4. The stator core 1 is cylindrical, and a plurality of core slots 11 that penetrate axially are uniformly distributed in an annular array on the inner side thereof. The ventilation body 2 and the winding 3 are fixed in the core slots 11. One ventilation body 2 is fixed in each core slot 11, and each winding 3 is arranged around two adjacent core slots 11, so that there are two parallel sections of windings 3 in each core slot 11. The slot wedge 4 is plugged at the opening of the core slot 11 to support and isolate and insulate the winding 3.

[0032] Referring to Figure 3 , the cross-section of the core slot 11 is trapezoidal with a small top and a large bottom. The corresponding opening is the top of the trapezoid, and the corresponding slot bottom is the bottom of the trapezoid.

[0033] In other embodiments, the core slot 11 may also be other shapes with an opening width smaller than the slot bottom width.

[0034] A first card slot 111 is provided at the bottom of the core slot 11, and the cross-section of the first card slot 111 is trapezoidal with a small opening and a large slot bottom. The first card slot 111 may also be other shapes with an opening width smaller than the slot bottom width.

[0035] In other embodiments, the first card slot 111 may also have a rectangular cross-section.

[0036] Second card slots 112 are provided near the openings on both side walls of the core slot 11, and the two second card slots 112 in the same core slot 11 are symmetric about the symmetry plane of the core slot 11.

[0037] Referring to Figure 4 , the ventilation body 2 is fixed to the bottom of the core slot 11. The specific fixing method can be by snap fixation, bonding fixation, etc. The ventilation body 2 includes two side plates 21 and a bottom plate 22, and the two side plates 21 protrude into the core slot 11. The two side plates 21 and the bottom plate 22 enclose a hollow columnar structure with a triangular cross-section, and a ventilation duct 23 with a sealed outer periphery is formed in the hollow part. The ventilation duct 23 is parallel to the penetration direction of the core slot 11 for ventilation and heat dissipation.

[0038] The shape of the bottom of the ventilation body 2 is adapted to the shape and size of the first card slot 111 with a trapezoidal cross-section in the above embodiments. That is, the ventilation body 2 can be fixed in the first card slot 111 through the bottom plate 22 and the parts of the two side plates 21 close to the bottom plate 22, so as to realize the installation and fixation in the core slot 11.

[0039] The shape of the bottom of the ventilation body 2 can also be adapted to the shape of the first card slot 111 with other shapes where the opening width is smaller than the bottom width of the slot in the above embodiments, so as to position the installation of the ventilation body 2 at the bottom of the iron core slot 11 and prevent it from falling off.

[0040] The shape of the bottom of the ventilation body 2 can also be adapted to the shape of the first card slot 111 with a rectangular cross-section in the above embodiments. When assembling the ventilation body 2, the position of the ventilation body 2 in the iron core slot 11 can be positioned only by the cooperation of the bottom shapes of the ventilation body 2 and the first card slot 111. Then, fixation can be completed by methods such as bonding.

[0041] In some embodiments, the ventilation body 2 can also include only two side plates 21. The two side plates 21 are fixedly connected at an angle. The ventilation body 2 is fixed to the bottom of the iron core slot 11 through the edge parts of the two side plates 21, so as to form a peripherally sealed ventilation duct 23 between the two side plates 21 and the bottom of the iron core slot 11. The two side plates 21 can be bent from the same sheet metal part.

[0042] In addition to the above two side plates 21 and one bottom plate 22, the ventilation body 2 can also further include another plate member with a width narrower than that of the bottom plate 22. The edges of the two side plates 21 close to the bottom of the iron core slot 11 are respectively sealed and fixed to the opposite sides of the bottom plate 22, and the edges of the two side plates 21 far from the bottom of the iron core slot 11 are respectively sealed and fixed to the opposite sides of the other plate member, that is, a hollow columnar structure with a trapezoidal cross-section is formed by surrounding, and the hollow part serves as the ventilation duct 23.

[0043] Reinforcing plates can also be provided inside the ventilation body 2, so as to isolate one ventilation duct 23 into multiple mutually parallel ventilation ducts 23.

[0044] The setting of the ventilation body 2 can prevent the blockage of the ventilation duct 23 in the dipping process of the winding 3, ensure the smoothness of the ventilation duct 23, thereby accelerating the heat dissipation of the winding 3, avoiding the use of manufacturing or use methods with relatively high costs such as low-loss silicon steel sheets, high-temperature-resistant insulation materials, and high-air-volume fans, and without the need for segmented design of the stator core 1 on the basis of ensuring the heat dissipation effect, improving the effective utilization rate of materials, and further reducing the production cost of the motor.

[0045] Refer to Figure 5 , the cross-section of the winding 3 is rectangular, and the winding 3 is fixed between the side plates 21 close to each other and the side walls of the iron core slot 11. The two side plates 21 are respectively parallel to the two side walls of the adjacent iron core slot 11, so that the two sides of the winding 3 with a rectangular cross-section are respectively supported and fixed between the side plates 21 of the ventilation body 2 and the side walls of the iron core slot 11. That is, in one iron core slot 11, two sections of the two windings 3 are respectively fixedly arranged on both sides of the ventilation body 2. Thus, air flows through the ventilation duct 23 to take away the heat of the windings 3 on both sides.

[0046] Two sides of the winding 3 can be respectively arranged close to the side plate 21 of the ventilation body 2 and the side wall of the iron core slot 11, thereby increasing the structural compactness and improving the heat dissipation and support effects on the winding 3.

[0047] The insulating slot wedge 4 is of a flat strip structure, and the cross-sectional shapes of the two edges of the insulating slot wedge 4 respectively match the cross-sectional shapes of the corresponding two second card slots 112. Further, the insulating slot wedge 4 can be inserted into the second card slots 112 through its two edges respectively, and then sealed and fixed at the opening of the iron core slot 11. On the one hand, it plays a role in supporting and fixing the winding 3 to prevent the winding 3 from slipping out of the iron core slot 11. On the other hand, it plays a role in isolating and insulating the winding 3.

[0048] In the case where the second card slots 112 are not provided at the opening of the iron core slot 11, since the shape of the iron core slot 11 is small at the opening and large at the bottom, the insulating slot wedge 4 can also be inserted into the iron core slot 11 along the length direction of the iron core slot 11. And because the width of the insulating slot wedge 4 is greater than the opening width of the iron core slot 11, it can also seal the opening of the iron core slot 11 and play a role in supporting and insulating the winding 3.

[0049] Continue to refer to Figure 3 , on the basis of ensuring the heat dissipation effect of the above structural settings, the stator iron core 1 is formed by stacking a plurality of iron core sheets, and through holes 12 corresponding to each are opened in each iron core sheet. The rod parts of fasteners such as long rivets are inserted through the through holes 12, and each iron core sheet is fixedly connected into the stator iron core 1 through the fasteners. That is, the stator iron core 1 is fixed as a whole by passing the rod parts of the fastening components through the corresponding through holes 12 in each iron core sheet, instead of assembling the stator iron core 1 in sections for heat dissipation considerations. Thereby, the overall stiffness of the stator iron core 1 is improved, and the anti-vibration ability of the stator iron core 1 is enhanced. Due to avoiding the segmented design, the connection between the iron core sheets of the stator iron core 1 is closer and more firm, and the gap between them is smaller, thereby improving the problem of high noise of the switched reluctance motor.

[0050] Multiple through holes 12 can be provided as needed. In this embodiment, the through holes 12 are arranged in a circular array on the iron core sheet, and the through holes 12 are arranged on the middle symmetry line between two adjacent iron core slots 11 in the radial direction of the iron core sheet. A plurality of through holes 12 can be opened on the middle symmetry line between every two adjacent iron core slots 11.

[0051] Based on the above embodiments, the stator of the switched reluctance motor of the present invention can be assembled in the following manner:

[0052] Continue to refer to Figure 3 and Figure 6, stack multiple iron chips together according to the corresponding relationship, where the corresponding relationship means that the parts of each iron chip corresponding to the iron core slots 11 and the through holes 12, etc. are correspondingly overlapped. Pass the rod part of a fastener such as a long rivet through the corresponding through holes 12 of each iron chip, and after fastening, the multiple iron chips become an integral stator core 1.

[0053] If the opening width of the first card slot 111 is smaller than the bottom width, the shape of the bottom of the ventilation body 2 is adapted to the shape of the first card slot 111. For example, the ventilation body 2 is a hollow columnar structure with a triangular cross-section formed by enclosing two side plates 21 and a bottom plate 22. Then insert the bottom of the ventilation body 2 into the first card slot 111 from the end of the first card slot 111 along the length direction of the first card slot 111 until the ventilation body 2 completely enters the iron core slot 11, that is, the radial and circumferential assembly and fixation of the ventilation body 2 in the iron core slot 11 are completed, and it is fixed axially by friction.

[0054] In the case where the ventilation body 2 only includes two side plates 21 fixed in a folded angle shape, the above method can also be used to insert the edge parts of the two side plates 21 into the first card slot 111 for fixation. When the two side plates 21 both have a certain elasticity, the elastic force of the two side plates 21 spreading outwards from each other can be used to press the edges of the two side plates 21 against the two side walls of the first card slot 111 respectively to increase the friction force, thereby completing the preliminary fixation of the ventilation body 2 in the iron core slot 11.

[0055] If the first card slot 111 is only used to position the ventilation body 2, for example: the first card slot 111 is a groove body structure with a rectangular cross-section. Then, after placing the bottom of the ventilation body 2 in the first card slot 111, only the positioning of the ventilation body 2 in the iron core slot 11 is completed, and bonding or other methods still need to be used for fixation.

[0056] Continue to refer to Figure 1 and Figure 7 , after fixing the ventilation body 2 in the iron core slot 11 by the above method, lay insulating paper in the iron core slot 11, and then fix the winding 3 between the side plate 21 of the ventilation body 2 and the side wall of the iron core slot 11. Then, insert and fix the insulating slot wedge 4 at the opening of the iron core slot 11 by using the second card slot 112 opened on both side walls of the iron core slot 11 and the edge shape of the insulating slot wedge 4 adapted to the second card slot 112, so as to support and fix the winding 3 in the iron core slot 11 and prevent the winding 3 from falling off from the iron core slot 11.

[0057] After completing the above fixing process, perform impregnation treatment on the above structure. First, block both ends of the ventilation body 2. The peripheral sealing structure of the ventilation body 2 can effectively prevent insulating paint from entering the ventilation duct 23 and ensure the smoothness of the ventilation duct 23.

[0058] After the dipping treatment is completed, remove the plugs at both ends of the ventilation body 2. Assemble the completed stator onto the motor, and the air blown by the fan inside the motor can pass through the ventilation duct 23 and be blown out, thereby greatly improving the heat dissipation effect of the winding 3 and preventing the motor from overheating too quickly.

[0059] Although the invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but rather should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A switched reluctance motor, characterized in that, Comprising: Motor body; Stator, disposed within the motor body, including a stator core, a ventilation body, and windings; a plurality of through-core slots are uniformly formed on the inner side of the stator core, and the opening width of the core slots is smaller than the bottom width; the ventilation body is fixed to the bottom of the core slots and includes two side plates protruding into the core slots; a peripherally sealed ventilation duct is formed between the two side plates, and the ventilation duct is parallel to the through direction of the core slots; the side plates are parallel to the side walls of the adjacent core slots; the windings are fixed between the side plates and the side walls of the adjacent core slots; and the two sides of the windings can be respectively disposed adjacent to the side plates of the ventilation body and the side walls of the core slots. A first card slot is provided at the bottom of the core slot, and the bottom of the ventilation body is inserted into the first card slot. The opening width of the first card slot is smaller than the bottom width, and the shape of the bottom of the ventilation body is adapted to the shape of the first card slot to prevent it from falling out of the first card slot; both side plates are elastic, and the edges of the two side plates are respectively pressed against the two side walls of the first card slot by the elastic force of the two side plates spreading outwards from each other to increase the friction force, thereby completing the preliminary fixation of the ventilation body in the core slot. An insulating slot wedge is provided at the opening of the core slot, and the insulating slot wedge covers the windings to support and fix the windings in the core slot.

2. The switched reluctance motor according to claim 1, wherein The ventilation body further includes a bottom plate, and the two edges of the two side plates are respectively fixed to the opposite sides of the bottom plate, and a peripherally sealed ventilation duct is formed between the two side plates and the bottom plate; the bottom plate is fixed to the bottom of the core slot.

3. The switched reluctance motor according to claim 2, wherein, The other two edges of the two side plates are fixed to each other, so that the ventilation body becomes a hollow columnar structure with a triangular cross-section.

4. The switched reluctance motor according to claim 1, wherein, The stator core is formed by stacking a plurality of iron core sheets; through holes corresponding to each iron core sheet are formed, and the rod portions of fasteners are passed through the through holes, and the stator core is fixedly connected by the fasteners.

5. The switched reluctance motor according to claim 1, characterized in that Second card slots are respectively formed at the side walls of the core slot near the opening, and the edges of the insulating slot wedge are snapped into the second card slots.

6. The switched reluctance motor according to claim 1, characterized in that, The cross-section of the core slot is trapezoidal, the cross-section of the winding is rectangular, and the two sides of the winding are respectively adjacent to the side plates and the side walls of the core slot.

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