Dustproof structure of switched reluctance motor for angle grinder

Abstract

The utility model discloses a dustproof structure of a switched reluctance motor for an angle grinder, which comprises a dust blocking cover, the dust blocking cover comprises a plurality of baffle plates and partition grooves, the baffle plates and the partition grooves are arranged at intervals along the circumferential direction, the baffle plates correspond to the projection positions of windings on the dust blocking cover, and the partition grooves correspond to the positions of the isolation grooves. The switch reluctance motor dustproof structure for the angle grinder provided by the utility model can effectively improve the dustproof capability of the motor, can effectively dissipate heat of the stator, and also improves the durability and practicability of the motor and the angle grinder.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a dustproof structure for a switched reluctance motor used in an angle grinder. Background Technology

[0002] An angle grinder is a tool that uses an electric motor to drive a rotating grinding disc to grind or polish workpieces. During operation, a large amount of dust is generated. The durability of the motor in dusty environments directly affects the overall lifespan of the machine. In recent years, with the increasingly mature development of switched reluctance brushless motor drive technology, it has gradually been applied in angle grinders due to its own characteristics, such as not adsorbing iron powder in metal dust. Compared with permanent magnet brushless motors, it has some natural advantages in brushless product applications.

[0003] While switched reluctance motors have solved the rotor dust protection problem, the stator winding dust protection issue remains. To improve the motor's durability in dusty environments, traditional processes involve resin coating the stator windings to enhance their protection and reduce dust damage. However, extensive practical applications have revealed that this coating process offers limited protection, failing to meet expectations. Especially after a period of use, the coating layer on the winding surface is often damaged by dust, exposing the copper wires and leading to motor failure. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a dustproof structure for a switched reluctance motor used in an angle grinder. This structure can effectively improve the dustproof capability of the motor and enhance the durability of both the motor and the angle grinder.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A dustproof structure for a switched reluctance motor used in an angle grinder is disclosed. The angle grinder contains a switched reluctance motor, which includes a stator and a rotor. Windings are evenly distributed on the stator, and isolation slots are formed between adjacent windings. The dustproof structure includes a dust cover disposed at both ends of the stator. The dust cover includes several baffles and partition slots arranged circumferentially, wherein the baffles correspond to the projection positions of the windings on the dust cover, and the partition slots correspond to the positions of the isolation slots.

[0007] According to one aspect of the present invention, the edge of the baffle has a protrusion in the direction toward the stator.

[0008] According to one aspect of the present invention, the width of the baffle along the circumference is the same as the width of the winding end along the circumference.

[0009] According to one aspect of the present invention, the baffle and the protrusion on the baffle form a receiving space with the inner side of the stator lamination, and the winding corresponding to the position of the baffle is received in the receiving space.

[0010] According to one aspect of the present invention, insulating end plates are provided at both ends of the stator, and the insulating end plates are positioned at both ends of the stator by an embedded manner.

[0011] According to one aspect of the present invention, the number of baffles is the same as the number of windings, and the number of isolation slots is the same as the number of winding isolation slots.

[0012] According to one aspect of the present invention, a fan is provided on the side of the dust cover away from the stator.

[0013] According to one aspect of the present invention, the partition groove, the isolation groove, and the fan form an air duct that runs through the switched reluctance motor.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The baffle and the protrusions on the baffle form a receiving space with the inner side of the stator lamination. The winding corresponding to the position of the baffle is received in this space, which can effectively avoid the direct impact between the front of the winding end and the dust, protect the winding, and extend the service life of the motor and machine.

[0016] 2. While ensuring dust prevention, the combination of the partition groove and the isolation groove allows air to pass through the isolation groove between the windings, carrying away the heat from the windings and reducing the impact on stator heat dissipation;

[0017] 3. This structure is cleverly designed on the dust cover to meet multiple purposes, and the structure is simple and easy to assemble.

[0018] Other beneficial effects of the dustproof structure for a switched reluctance motor for an angle grinder provided by this utility model are described in the embodiments. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 An overall structural diagram of the angle grinder is provided in one embodiment of this utility model;

[0021] Figure 2 A structural diagram of the switched reluctance motor in one embodiment of this utility model;

[0022] Figure 3 An exploded view of the switched reluctance motor in one embodiment of this utility model;

[0023] Figure 4 A stator structure diagram of a switched reluctance motor in one embodiment of this utility model;

[0024] Figure 5 This is a structural diagram of the dust cover in one embodiment of the present invention.

[0025] In the diagram: 1. First dust cover; 2. Second dust cover; 21. Baffle; 22. Isolation groove; 23. First screw hole; 3. Rotor; 4. Stator; 5. Screw; 6. Switched reluctance motor; 7. First insulating end plate; 8. Winding; 9. Second insulating end plate; 10. ; 11. Isolation groove; 12. Second screw hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0028] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0029] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two components or an interaction between two components.

[0030] An embodiment of this utility model provides an angle grinder such as Figure 1 As shown, it includes a housing, an output section at the front end of the housing, and a power supply section at the rear end of the housing. A switched reluctance motor 6 is provided inside the housing. The switched reluctance motor 6 is parallel to the housing in the installation direction, and a fan 10 is provided near the front end of the switched reluctance motor 6.

[0031] Specifically, the structure of the switched reluctance motor is as follows: Figure 2-4 As shown, the stator includes a rotor 3 located at the central axis and a stator 4 surrounding the rotor 3. As those skilled in the art know, the stator is formed by stacking several stator laminations to form a barrel-like stator body. The inner wall of the stator 4 has multiple protrusions, on which windings 8 are provided to generate an alternating magnetic field using excitation windings. An isolation groove 11 is formed between every two adjacent windings 8, and the isolation groove 11 is elongated and runs through the entire inner wall of the stator. Insulating end plates (7, 9) are provided at both ends of the stator 4, and the insulating end plates are positioned at both ends of the stator 4 by embedding.

[0032] The dustproof structure of the angle grinder's switched reluctance motor includes dust covers (1, 2) located at both ends of the stator. Specifically, the dust covers have screw holes 23, which are connected to the screw holes 12 on the stator insulating end plates via screws 5, thus fixing the dust covers to both ends of the stator insulating end plates. The radial inner diameter of the dust cover is consistent with the inner diameter of the insulating end plates 7 and 9. The outer circumference of the dust cover has protruding ribs that are continuous and uninterrupted, allowing the dust cover to completely cover the outer circumference of the insulating end plates after connection.

[0033] The dust cover includes a first dust cover 1 and a second dust cover 2 located at both ends of the stator. Since the two are only different in position, only the second dust cover 2 will be described in detail. Those skilled in the art can understand the first dust cover 1 based on its structure and even make some adaptive modifications.

[0034] The second dust cover 2 includes a plurality of baffles 21 and partition grooves 22 arranged circumferentially at intervals. The baffles 21 are annular and discontinuously distributed circumferentially. The baffles 21 correspond to the projection positions of the windings 8 on the dust cover, and the number of baffles 21 is the same as the number of windings, i.e., they are in a one-to-one correspondence. The edge of the baffle 21 has a protrusion that extends toward the stator 4, i.e., toward the interior of the second dust cover. Here, the edge refers to the inner edge away from the outer circle of the dust cover. The circumferential width of the baffle 21 is the same as the circumferential width of the winding end, so that when the dust cover is installed on the insulating end plate of the stator end, the baffles 21 and the protrusions on the baffles 21 form a receiving space with the inner side of the stator lamination, and the winding corresponding to the position of the baffle is received in the receiving space.

[0035] Most of the winding ends are severely damaged by dust due to the flow of dust towards the front. This damage is concentrated at both ends of the winding; windings located in the middle channel of the isolation groove are less affected. Therefore, the dust cover provided by this invention effectively prevents direct impact between the front of the winding ends and dust, effectively protecting the magnetic reluctance and extending the service life of the motor and angle grinder. Furthermore, the baffle is generally made of plastic, which is far stronger than the materials used in existing protective processes, providing strong dust protection, reducing the likelihood of damage, and significantly improving reliability and durability compared to existing structures.

[0036] The partition slot 22 is disposed between adjacent baffles. The partition slot 22 corresponds to the isolation slot 11 in position, and the number of partition slots is the same as the number of winding isolation slots. The projections of the partition slot 22 and the isolation slot 11 on the end face overlap, forming a through channel. The partition slot, the isolation slot, and the fan form an air duct that runs through the switched reluctance motor. Specifically, external air flows through the partition slot into the isolation slot until it reaches the air outlet at the other end, ultimately carrying away the heat from the windings and effectively dissipating heat from the stator.

[0037] This invention provides a dustproof structure for a switched reluctance motor used in angle grinders, which effectively improves the motor's dustproof capability. Simultaneously, the combination of the partition slots and isolation slots allows air to pass through the isolation slots between the windings, carrying away heat from the windings and effectively dissipating heat from the stator. This structure, through ingenious design of the dust cover, is simple in structure and low in cost. This structure comprehensively improves the durability and practicality of both the motor and the angle grinder.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A dustproof structure for a switched reluctance motor used in an angle grinder, wherein, The angle grinder is equipped with a switched reluctance motor, which includes a stator and a rotor. The stator is also uniformly distributed with windings, and an isolation slot is formed between adjacent windings. The feature is that the dustproof structure of the switched reluctance motor for the angle grinder includes a dust cover, which is disposed at both ends of the stator. The dust cover includes a plurality of baffles and partition slots arranged circumferentially, wherein the baffles correspond to the projection positions of the windings on the dust cover, and the partition slots correspond to the positions of the isolation slots.

2. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 1, characterized in that: The edge of the baffle has a protrusion in the direction of the stator.

3. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 2, characterized in that: The width of the baffle along the circumference is the same as the width of the winding end along the circumference.

4. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 3, characterized in that: The baffle and the protrusion on the baffle form a receiving space with the inner side of the stator lamination, and the winding corresponding to the position of the baffle is received in the receiving space.

5. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 1, characterized in that: Insulating end plates are provided at both ends of the stator, and the insulating end plates are positioned at both ends of the stator by embedding.

6. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 1, characterized in that: The number of baffles is the same as the number of windings, and the number of isolation slots is the same as the number of winding isolation slots.

7. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 1, characterized in that: A fan is located on the side of the dust cover away from the stator.

8. The dustproof structure for a switched reluctance motor used in an angle grinder according to claim 7, characterized in that: The partition groove, the isolation groove, and the fan form an air duct that runs through the switched reluctance motor.

Images