WO2021128056A1

WO2021128056A1 - Switched reluctance motor

Info

Publication number: WO2021128056A1
Application number: PCT/CN2019/128229
Authority: WO
Inventors: 付强; 刘福刚; 周庆余; 王舒; 杨亚辉; 赵大同
Original assignee: 山东风发新能源科技有限公司
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2021-07-01

Abstract

Provided is a switched reluctance motor, comprising a motor main body and a stator, wherein the opening width of an iron core slot is less than the width of the bottom of the slot; a ventilation body is fixedly arranged at the bottom of the iron core slot, and comprises two side plates, which protrude into the iron core slot; a ventilation channel with the periphery thereof sealed is formed between the two side plates, and the ventilation channel is parallel to a penetrating direction of the iron core slot; and the side plates are parallel to a side wall of the iron core slot that is adjacent thereto, and a winding is fixed between the side plates and the adjacent side wall of the iron core slot. The arrangement of the ventilation body can prevent the ventilation channel from being blocked during a winding paint immersion process, ensuring a smooth flow through the ventilation channel, which in turn accelerates the heat dissipation of the winding, thus avoiding the use of methods with high manufacturing or usage costs, such as controlling thermal parameters of the motor, low-loss silicon steel sheets, high-temperature-resistant grade insulating materials, filling a gap in the slot with an adhesive, and a large-air-flow fan, and improving the acceptance degree of users; and on the basis of ensuring the heat dissipation effect, there is no need to carry out sectional design on an iron core, thereby improving the effective utilization rate of materials, and further reducing the production cost of the motor.

Description

Switched reluctance motor

Technical field

The invention relates to the technical field of power devices, in particular to a switched reluctance motor.

Background technique

Compared with traditional asynchronous or permanent magnet motors, switched reluctance motors have the characteristics of fewer stator slots, large slot shapes, concentrated windings, and large gaps in the slots, which makes it relatively difficult to dissipate heat from the windings when the motor is running. If the problem of winding heat dissipation is not solved, the temperature of the motor will rise, and the motor will burn out.

At present, the methods to improve the heat dissipation of switched reluctance motors include: design of controlling the thermal parameters of the motor, the use of low-loss silicon steel sheets, the use of high-temperature-resistant insulating materials, the gap filling in the slot, and the use of fans with large air volume. These methods all have a certain effect on improving the temperature rise and heat resistance of the motor, but they will bring about a significant increase in manufacturing costs and maintenance costs in the later use process, thereby reducing user acceptance.

Summary of the invention

To solve the above technical problems, the present invention provides a switched reluctance motor, which includes a motor main body and a stator.

The stator is arranged in the main body of the motor and includes a stator core, a ventilating body and windings.

A plurality of penetrating iron core slots are evenly arranged on the inner side of the stator iron core, and the opening width of the iron core slots is smaller than the width of the slot bottom.

The ventilating body is fixed to the bottom of the iron core groove and includes two side plates protruding into the iron core groove; a ventilating channel with a peripheral seal is formed between the two side plates. The penetrating directions of the core slots are parallel.

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.

Further, the ventilating body further includes a bottom plate, the edges of the two side plates are respectively fixed at two opposite sides of the bottom plate, and a peripherally sealed ventilation channel is formed between the two side plates and the bottom plate.

Further, the ventilating body is a hollow columnar structure with a triangular cross section enclosed by the two side plates and the bottom plate.

Further, the stator iron core is formed by superimposing a plurality of iron sheets; each iron sheet is provided with a corresponding through hole, and the rod part of the fastener is penetrated in the through hole, and is passed through the fastening The parts are tightly connected to form the stator core.

Further, the bottom of the iron core slot is provided with a first slot, and the bottom of the ventilating body is inserted into the first slot.

Further, the opening width of the first slot is smaller than the width of the slot bottom, and the shape of the bottom of the ventilating body is adapted to the shape of the first slot to prevent falling out of the first slot.

Further, an insulating slot wedge is provided at the opening of the iron core slot, and the insulating slot wedge covers the winding.

Further, the two side walls of the iron core groove are provided with second clamping grooves near the opening, and the edge of the insulating groove wedge is clamped into the second clamping groove.

Further, 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 close to the side plate and the side wall of the core slot.

It can be seen from the above technical solutions that the present invention has at least the following advantages and positive effects:

The present invention provides a switched reluctance motor. A winding with a rectangular cross section is respectively arranged in a trapezoidal iron core slot near the two side walls, and a ventilation body is arranged between the two windings and the bottom surface of the iron core slot. Make the two side plates of the ventilating body close to the two windings and form a ventilation channel between the two side plates. The setting of the ventilating body can avoid blocking the ventilation channel during the winding dipping process, ensure the smoothness of the ventilation channel, and accelerate the heat dissipation of the winding , Avoid the use of low-loss silicon steel sheets, high-temperature-resistant insulating materials, large air volume fans and other methods that are more expensive to manufacture or use, and there is no need to design the iron core in sections on the basis of ensuring the heat dissipation effect, which improves the material The effective utilization rate further reduces the production cost of the motor.

Description of the drawings

Fig. 1 is a partially cut-away structural diagram of a front view of a stator in an embodiment of the present invention.

Fig. 2 is a schematic diagram of the front view of the stator core in an embodiment of the present invention.

Fig. 3 is a partial enlarged schematic view of the structure of Fig. 2.

Fig. 4 is a schematic diagram of the front view of the ventilating body in an embodiment of the present invention.

Fig. 5 is a partial enlarged schematic view of the structure of Fig. 1.

Fig. 6 is a side sectional view of the structure of the stator core in an embodiment of the present invention.

Figure 7 is a side sectional view of the structure of the stator in an embodiment of the present invention.

Reference signs are explained as follows: 1. Stator core; 11, iron core slot; 111, first slot; 112, second slot; 12, through hole; 2. vent; 21, side plate; 22, bottom plate ; 23. Ventilation channel; 3. Winding; 4. Insulation slot wedge.

Detailed ways

Typical embodiments embodying 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 implementations, which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes, rather than limiting this invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" and other directions or The positional relationship is based on the position or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be understood as a limitation to 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 number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more than two, unless otherwise specifically defined.

In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connect, or connect in one piece. It can be a mechanical connection or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, and it can be a communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

The embodiment of the present invention provides a switched reluctance motor, which includes a motor main body and a stator. Among them, the main body of the motor refers to other main functional parts except the stator. The stator is fixedly arranged in the casing of the motor main body.

1 and 2, the stator includes a stator core 1, a ventilating body 2, a winding 3 and an edge slot wedge 4. The stator core 1 has a cylindrical shape, and a plurality of core slots 11 extending in the axial direction are evenly distributed in an annular array on the inner side. The ventilating body 2 and the winding 3 are fixed in the iron core slot 11, and each iron core slot 11 is fixed with a ventilating body 2, and each winding 3 is arranged around two adjacent iron core slots 11, so that each iron core There are two parallel windings 3 in the slot 11. The edge slot wedge 4 is sealed at the opening of the core slot 11 to support and isolate the winding 3.

3, the cross section of the core groove 11 is a trapezoid with a small top and a large bottom, the corresponding opening is the top of the trapezoid, and the corresponding groove bottom is the bottom of the trapezoid.

In other embodiments, the core groove 11 may also have other shapes with an opening width smaller than the width of the groove bottom.

The bottom of the core slot 11 is provided with a first slot 111, and the cross section of the first slot 111 is a trapezoid with a small opening and a large bottom. The first slot 111 may also have other shapes with an opening width smaller than the width of the groove bottom.

In other embodiments, the first slot 111 may also be rectangular in cross section.

The two side walls of the iron core groove 11 are provided with second clamping grooves 112 near the opening, and the two second clamping grooves 112 in the same iron core groove 11 are symmetrical with respect to the symmetry plane of the iron core groove 11.

4, the venting body 2 is fixed to the bottom of the core groove 11, and the specific fixing method can be fixed by clamping, adhesive fixing, and the like. The ventilation body 2 includes two side plates 21 and a bottom plate 22, and the two side plates 21 protrude into the core groove 11. The two side plates 21 and the bottom plate 22 enclose a hollow columnar structure with a triangular cross section, and the hollow part forms a ventilation duct 23 with a peripheral seal. The ventilation duct 23 is parallel to the penetrating direction of the iron core groove 11 for ventilation and heat dissipation.

The shape of the bottom of the ventilating body 2 is compatible with the shape and the size of the first slot 111 with a trapezoidal cross section in the above embodiments. That is, the ventilating body 2 can be fastened to the first slot 111 through the bottom plate 22 and the part close to the bottom plate 22 with the side plates 21, so as to realize the installation and fixation in the core slot 11.

The shape of the bottom of the ventilating body 2 can also be adapted to the shape of the first slot 111 of other shapes whose opening width is smaller than the width of the groove bottom in the above embodiments, and then the ventilating body 2 is installed at the bottom of the iron core groove 11 Carry out positioning and prevent falling off.

The shape of the bottom of the ventilating body 2 can also be adapted to the shape of the first slot 111 with a rectangular cross section in the above embodiment, and when the ventilating body 2 is assembled, only the shape of the bottom of the ventilating body 2 and the first slot 111 is matched. The positioning of the position of the ventilating body 2 in the core groove 11 is completed. Then, it can be fixed by bonding and other methods.

In some embodiments, the ventilating body 2 may also include only two side plates 21, the two side plates 21 are fixedly connected in an angled shape, and the ventilating body 2 is fixed to the groove of the iron core groove 11 through the edge portions of the two side plates 21. The bottom, in turn, forms a peripherally sealed air passage 23 between the two side plates 21 and the bottom of the core groove 11. The two side plates 21 can be formed by bending the same sheet metal part.

In addition to the two side plates 21 and one bottom plate 22 described above, the ventilating body 2 may also include another plate with a narrower width than the bottom plate 22. The edges of the two side plates 21 close to the bottom of the core groove 11 respectively seal and fix the opposite sides of the bottom plate 22, and the edges of the two side plates 21 away from the bottom of the core groove 11 respectively seal and fix the opposite sides of the other plate. , That is, enclosed to form a hollow columnar structure with a trapezoidal cross-section, and the hollow part is used as a ventilation duct 23.

A reinforcing plate may also be arranged inside the ventilating body 2 to isolate one ventilating passage 23 into a plurality of ventilating passages 23 parallel to each other.

The setting of the ventilation body 2 can prevent the winding 3 from blocking the ventilation duct 23 during the dipping process of the winding 3, and ensure the smoothness of the ventilation duct 23, thereby speeding up the heat dissipation of the winding 3, and avoiding the use of low-loss silicon steel sheets, high-temperature-resistant insulating materials, and large air volume fans. Or a method with a higher cost is used, and the stator core 1 does not need to be designed in sections on the basis of ensuring the heat dissipation effect, which improves the effective utilization rate of materials and further reduces the production cost of the motor.

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

The two side surfaces of the winding 3 can be arranged close to the side plate 21 of the ventilating body 2 and the side wall of the core slot 11 respectively, thereby increasing the compactness of the structure and improving the heat dissipation and supporting effect of the winding 3.

The insulating slot wedge 4 is a flat strip structure, and the cross-sectional shapes of the two edges of the insulating slot wedge 4 are respectively adapted to the cross-sectional shapes of the corresponding two second clamping slots 112. Furthermore, the insulating slot wedge 4 can be inserted into the second clamping slot 112 through its two edges respectively to block and fix the opening of the iron core slot 11, on the one hand, it supports and fixes the winding 3 and prevents the winding 3 from being removed from the iron core. The core slot 11 slides out, and on the other hand, it isolates and insulates the winding 3.

In the case where the second card slot 112 is not provided at the opening of the core slot 11, since the shape of the core slot 11 has a small opening and a large slot bottom, the insulating slot wedge 4 can also be inserted into the core slot 11 along the length direction. In the core slot 11. Since the width of the insulating slot wedge 4 is greater than the opening width of the core slot 11, the opening of the core slot 11 can also be blocked, and the winding 3 can be supported and insulated.

Continuing to refer to Fig. 3, on the basis of the above structure setting to ensure the heat dissipation effect, the stator core 1 is made up of multiple iron chips, and each iron chip is provided with a corresponding through hole 12, and the through hole 12 is pierced with a long rivet. The iron chips are fastened to form the stator iron core 1 through fasteners such as the rods of the fasteners. That is, the stator core 1 is fixed as an integral structure by passing the rod of the fastening component through the corresponding through hole 12 on each core core, instead of assembling the stator core 1 in sections for heat dissipation considerations. Therefore, the overall rigidity of the stator core 1 is improved, and the anti-vibration ability of the stator core 1 is enhanced. Since the segmented design is avoided, the iron chips of the stator core 1 are connected more tightly and firmly, and the gap between each other is smaller, thereby improving the problem of high noise of the switched reluctance motor.

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 chip, and the through holes 12 are arranged symmetrically between two adjacent iron core slots 11 in the warp direction of the iron chip. On the line, a plurality of through holes 12 can be opened on the symmetrical line between every two adjacent core slots 11.

Based on the above embodiments, the stator of the switched reluctance motor of the present invention can be assembled in the following ways:

Continuing to refer to FIGS. 3 and 6, a plurality of iron chips are stacked together according to a corresponding relationship, where the corresponding relationship refers to the corresponding overlap of the position of each iron chip corresponding to the core groove 11 and the through hole 12. The rods of fasteners, such as long rivets, are inserted into the corresponding through holes 12 of each core sheet, and the plurality of core sheets become a whole stator core 1 after being fastened.

If the opening width of the first slot 111 is smaller than the width of the slot bottom, the shape of the bottom of the ventilating body 2 matches the shape of the first slot 111. For example, the ventilating body 2 is composed of two side plates 21 and a bottom plate 22 to form a cross section. It is a triangular hollow column structure. Then insert the bottom of the ventilating body 2 along the length direction of the first slot 111 from the end of the first slot 111 until the ventilating body 2 completely enters the core slot 11, that is, complete the venting body 2 in the core slot 11 The radial and circumferential assembly is fixed in the middle, and the axial direction is fixed by friction.

When the venting body 2 only includes two side plates 21 fixed in an angled shape, the edge portions of the two side plates 21 can also be inserted into the first slot 111 to be fixed in the above manner. In the case that the two side plates 21 have a certain degree of elasticity, the edges of the two side plates 21 can be pressed against the two sides of the first slot 111 respectively by the elastic force of the two side plates 21 opening outwards. To increase the friction on the wall, the preliminary fixing of the ventilating body 2 in the iron core groove 11 is completed.

If the first slot 111 is only used for positioning the ventilating body 2, for example, the first slot 111 is a slot structure with a rectangular cross section. After placing the bottom of the ventilating body 2 in the first slot 111, only the positioning of the ventilating body 2 in the iron core groove 11 is completed, and it still needs to be fixed by means of bonding or the like.

1 and 7, after completing the fixing of the ventilating 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 to the side plate 21 of the ventilating body 2 and the iron Between the side walls of the core groove 11. Then, using the edge shapes of the second clamping slots 112 opened on the two side walls of the core slot 11 and the insulating slot wedges 4 that are adapted to the second clamping slots 112, the insulating slot wedge 4 is inserted and fixed in the core slot 11 At the openings, the winding 3 is supported and fixed in the core slot 11 to prevent the winding 3 from falling out of the core slot 11.

After the above fixing process is completed, the above structure is dipped in paint. The two ends of the ventilating body 2 can be blocked first, and the outer peripheral sealing structure of the ventilating body 2 can effectively prevent the insulating paint from entering the ventilation duct 23 and ensure the smooth flow of the ventilation duct 23.

After finishing the dipping process, remove the plugs at both ends of the ventilation body 2. Assemble the assembled stator to the motor, and the wind blown by the fan inside the motor can pass through the ventilation duct 23 and blow out, thereby greatly improving the heat dissipation effect of the winding 3 and avoiding the motor from heating up too fast.

Although the present invention has been described with reference to a few typical embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the present invention, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be broadly within the spirit and scope defined by the appended claims. Interpretation, therefore, all changes and modifications falling within the scope of the claims or their equivalents shall be covered by the appended claims.

Claims

A switched reluctance motor is characterized in that it comprises:

Motor main body;

The stator is arranged in the motor body and includes a stator iron core, a ventilating body and windings; a plurality of through iron core slots are evenly distributed on the inner side of the stator iron core, and the opening width of the iron core slots is smaller than the width of the slot bottom; The ventilating body is fixed to the bottom of the iron core groove and includes two side plates protruding into the iron core groove; a ventilated peripherally sealed air passage is formed between the two side plates, and the ventilating passage is connected to the iron core groove. The through direction of the iron core slot is parallel; 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.
The switched reluctance motor according to claim 1, wherein the ventilation body further comprises a bottom plate, two edges of the two side plates are respectively fixed to two opposite sides of the bottom plate, and the two side plates And a ventilation channel with a peripheral seal is formed between the bottom plates; the bottom plate is fixed to the bottom of the iron core groove.
The switched reluctance motor according to claim 2, wherein the other two edges of the two side plates are fixed, so that the ventilating body becomes a hollow cylindrical structure with a triangular cross section.
The switched reluctance motor according to claim 1, wherein the bottom of the core slot is provided with a first slot, and the bottom of the ventilating body is inserted into the first slot.
The switched reluctance motor according to claim 4, wherein the width of the opening of the first slot is smaller than the width of the slot bottom, and the shape of the bottom of the ventilating body is adapted to the shape of the first slot Prevent falling off from the first card slot.
The switched reluctance motor according to claim 1, wherein the stator core is formed by superimposing a plurality of iron chips; each of the iron chips is provided with a corresponding through hole, and the through hole is penetrated The rod part of the fastener is fastened and connected to the stator core through the fastener.
The switched reluctance motor according to claim 1, wherein an insulating slot wedge is provided at the opening of the iron core slot, and the insulating slot wedge covers the winding.
The switched reluctance motor according to claim 7, wherein the two side walls of the iron core slot are provided with second slots near the opening, and the edge of the insulating slot wedge is locked into the second slot in.
The switched reluctance motor of claim 1, wherein 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 close to the side plate and the The side wall of the core slot.