Rotor and rotating shaft pouring integrated structure for improving uniform air gaps of disc type motor

Abstract

The utility model discloses a rotor and rotating shaft pouring integrated structure for improving uniform air gaps of a disc-type motor, which belongs to the technical field of motors and comprises a rotor disc injection molding aluminum piece, neodymium iron boron magnetic steel is arranged on the rotor disc injection molding aluminum piece, rotor disc lightening holes are arranged on the rotor disc injection molding aluminum piece, and the rotor disc is provided with a rotor disc. According to the utility model, the rotor and the rotating shaft are processed into a whole, compared with a conventional split type assembly structure, the vibration noise can be effectively reduced, the service life of the motor is prolonged, the rotor and the rotating shaft are processed into a whole on the premise that the performance of neodymium iron boron magnetic steel is ensured, the perpendicularity of the rotor and the rotating shaft is ensured, and the service life of the motor is prolonged. Compared with a conventional split type rotor rotating shaft structure, the integrated pouring structure can be conveniently controlled by a controller, vibration and noise caused by uneven air gaps can be reduced, and the situation that normal work cannot be achieved due to the fact that air gap deviation is too large is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor and shaft casting integrated structure for improving the uniform air gap of a disc motor. Background Art

[0002] The existing axial flux disc motor rotor (including magnetic steel) and the shaft are both split structures. Since the split structure of the rotor and the shaft are two separate parts, they need to be fixed mechanically, which will inevitably cause assembly errors. Coupled with the processing errors in the production process of the rotor and the shaft, the cumulative errors will cause the assembly deviation of the rotor disc and the shaft to be too large. The assembly process of the disc motor itself is very complicated. Controlling the assembly error within the ideal range will reduce production efficiency and increase production costs. It is difficult to ensure product consistency in batches, which will cause uneven working air gaps between the stator and the rotor. For disc motors, uneven air gaps will cause large unilateral magnetic pull; uneven air gaps will first increase the control difficulty of the controller, resulting in poor control accuracy, thereby causing the motor output performance and operating stability to deteriorate, aggravating the vibration and noise of the motor, and in severe cases causing the motor to fail to work normally. Utility Model Content

[0003] The utility model solves the technical problems in the above-mentioned background technology and provides a rotor and shaft integrally cast structure for improving the uniform air gap of a disc-type motor.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0005] A rotor and shaft casting integrated structure for improving the uniform air gap of a disc motor includes a rotor disc injection-molded aluminum part, on which a neodymium iron boron magnet is arranged, on which a rotor disc weight reduction hole is arranged, and on which a motor shaft is arranged.

[0006] Preferably, the aluminum injection molded rotor disc does not need to be magnetically conductive, and the silicon steel sheet can be replaced with aluminum, thereby reducing the weight of the entire vehicle.

[0007] Preferably, the NdFeB magnets are evenly distributed in the circumferential direction of the injection-molded aluminum part of the rotor disk, and ten groups of the NdFeB magnets are provided.

[0008] Preferably, the NdFeB magnet has three steps for positioning with the injection-molded aluminum part of the rotor disk.

[0009] Preferably, before the rotor disk aluminum injection molding is formally cast, it is necessary to ensure that the axis of the motor shaft and the axis of the rotor disk aluminum injection molding coincide within a certain tolerance range.

[0010] Preferably, the rotor disk injection-molded aluminum part is cast into one piece with the motor shaft and the NdFeB magnet by injecting high-temperature molten aluminum into a mold.

[0011] Preferably, the rotor disk injection-molded aluminum part is applied to a dual-stator single-rotor disk permanent magnet synchronous motor in the electric motorcycle industry.

[0012] With the above structure, the utility model has the following advantages:

[0013] 1. The utility model processes the rotor and the rotating shaft into one piece, which can effectively reduce vibration noise and extend the service life of the motor compared to the conventional split assembly structure.

[0014] 2. Under the premise of ensuring the performance of NdFeB magnets, the utility model processes the rotor and the shaft into one piece, ensuring the verticality of the rotor and the shaft, and then ensuring a uniform air gap between the stator and the rotor. Compared with the conventional split rotor shaft structure, the one-piece casting structure is easier to control by the controller, can reduce the vibration and noise caused by uneven air gap, and avoid the situation where the air gap deviation is too large and cannot work normally.

[0015] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is an axonometric diagram of a rotor and shaft cast-in-one structure for improving the uniform air gap of a disc-type motor according to the utility model;

[0018] Figure 2 It is a top view of a rotor and shaft cast-in-one structure for improving the uniform air gap of a disc-type motor according to the utility model;

[0019] Figure 3 This is a casting structure diagram of a rotor and a shaft cast-in-one structure for improving the uniform air gap of a disc-type motor in the utility model;

[0020] Figure 4 This is an axonometric diagram of a casting part of a rotor and a rotating shaft casting integrated structure for improving the uniform air gap of a disc-type motor of the utility model;

[0021] Figure 5This is an axonometric diagram of a magnetic steel shaft of a rotor and shaft cast-in-one structure for improving the uniform air gap of a disc-type motor of the utility model;

[0022] Figure 6 The utility model discloses a magnetic steel shaft structure diagram of a rotor and shaft cast-in-one structure for improving the uniform air gap of a disc-type motor.

[0023] As shown in the figure: 1. Rotor disc injection-molded aluminum parts; 2. NdFeB magnets; 3. Rotor disc weight reduction holes; 4. Motor shaft. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] The utility model is further described in detail below in conjunction with the full text:

[0027] Combined with Figures 1 to 6 A rotor and shaft casting integrated structure for improving the uniform air gap of a disc motor includes a rotor disc injection-molded aluminum part 1, a neodymium iron boron magnet 2 is provided on the rotor disc injection-molded aluminum part 1, a rotor disc weight reduction hole 3 is provided on the rotor disc injection-molded aluminum part 1, and a motor shaft 4 is provided on the rotor disc injection-molded aluminum part 1. The rotor and the shaft are processed into one piece, which can effectively reduce vibration noise and extend the service life of the motor compared to the conventional split assembly structure.

[0028] Among them, the rotor disk injection-molded aluminum part 1 does not need magnetic conductivity, and the silicon steel sheet can be replaced with aluminum, thereby reducing the weight of the whole vehicle. The neodymium iron boron magnets 2 are evenly distributed in the circumferential direction of the rotor disk injection-molded aluminum part 1. The neodymium iron boron magnets 2 are provided with ten groups. The neodymium iron boron magnets 2 have three steps for positioning with the rotor disk injection-molded aluminum part 1. Before the formal casting of the rotor disk injection-molded aluminum part 1, it is necessary to ensure that the axis of the motor shaft 4 coincides with the axis of the rotor disk injection-molded aluminum part 1 within a certain tolerance range. The rotor disk injection-molded aluminum part 1 is formed by injecting high-temperature aluminum liquid into the mold to align with the motor shaft 4 and the neodymium iron boron magnets 2. The NdFeB magnet 2 is cast into one piece, and the rotor disk injection-molded aluminum part 1 is used in the double-stator single-rotor disk permanent magnet synchronous motor in the electric motorcycle industry. Under the premise of ensuring the performance of the NdFeB magnet 2, the rotor and the shaft are processed into one piece, which ensures the verticality of the rotor and the shaft, and then ensures the uniform air gap between the stator and the rotor. Compared with the conventional split rotor shaft structure, the one-piece casting structure is easier to control by the controller, can reduce the vibration and noise caused by uneven air gap, and avoid the situation where the air gap deviation is too large and cannot work normally.

[0029] Working principle of the utility model: The utility model is applied to the double-stator single-rotor disc permanent magnet synchronous motor in the electric motorcycle industry. The device is a rotor disc injection-molded aluminum part 1 (including NdFeB magnets 2) and a motor shaft 4 cast as one. Since the motor is a double-stator single-rotor structure, the rotor disc injection-molded aluminum part 1 does not need magnetic conductivity, so the weight of the whole vehicle can be reduced by replacing the silicon steel sheet with aluminum. Ten groups of NdFeB magnets 2 are evenly distributed in the circumferential direction of the rotor disc injection-molded aluminum part 1. Each group of NdFeB magnets 2 has three steps for positioning with the rotor disc injection-molded aluminum part 1. Before formal casting, it is necessary to ensure that the axis of the motor shaft 4 coincides with the axis of the rotor disc injection-molded aluminum part 1 within a certain tolerance range.

[0030] The processing flow of the utility model is as follows: first, the motor shaft 4 is vertically installed at the center position of the lower mold. Secondly, ten groups of NdFeB magnets 2 are evenly installed and positioned through the fixing grooves of the lower mold. Then, the NdFeB magnets 2 between the upper mold and the lower mold are axially fixed by bolt connection. Finally, the aluminum liquid is slowly injected into the pouring port of the mold maintained at a constant temperature for pouring. After waiting for one to two minutes, the pouring of the blank is completed. Subsequently, the pouring blank is machined according to the requirements of the drawing to finally obtain the finished product. In addition, due to the particularity of this process, the NdFeB magnet 2 needs to be magnetized after the pouring is completed. On the one hand, the NdFeB magnet 2 has strong magnetism after magnetization, which is inconvenient for pouring. On the other hand, high-temperature pouring will cause irreversible demagnetization of the NdFeB magnet 2. The performance of the NdFeB magnet 2 that is poured and magnetized at high temperature is tested. The performance is very similar to that of the normally magnetized NdFeB magnet 2, and does not affect normal use.

[0031] The above describes the utility model and its implementation methods, which is not restrictive. What is shown in the full text is only one of the implementation methods of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it, without departing from the purpose of the invention of the utility model, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the utility model.

Claims

1. A rotor and shaft casting integrated structure for improving the uniform air gap of a disc motor, comprising a rotor disc injection-molded aluminum part (1), characterized in that: The rotor disc injection-molded aluminum part (1) is provided with a neodymium iron boron magnet (2), the rotor disc injection-molded aluminum part (1) is provided with a rotor disc weight reduction hole (3), and the rotor disc injection-molded aluminum part (1) is provided with a motor shaft.

2. The rotor and shaft integrally cast structure for improving the uniform air gap of a disk motor according to claim 1, characterized in that: The silicon steel sheet arranged on the rotor disk injection-molded aluminum part (1) can be replaced with aluminum.

3. The rotor and shaft casting integrated structure for improving the uniform air gap of a disk motor according to claim 2, characterized in that: The NdFeB magnets (2) are evenly distributed in the circumferential direction of the rotor disk injection-molded aluminum part, and ten groups of the NdFeB magnets (2) are provided.

4. The rotor and shaft integrally cast structure for improving the uniform air gap of a disk motor according to claim 3, characterized in that: The NdFeB magnet (2) has three steps for positioning with the rotor disk injection-molded aluminum part (1).

5. The rotor and shaft casting integrated structure for improving the uniform air gap of a disk-type motor according to claim 4, characterized in that: Before the rotor disk injection-molded aluminum part (1) is formally cast, the axis of the motor shaft (4) and the axis of the rotor disk injection-molded aluminum part (1) are arranged to coincide with each other.

6. The rotor and shaft integrally cast structure for improving the uniform air gap of a disk-type motor according to claim 5, characterized in that: The rotor disk injection-molded aluminum part (1) is cast into one piece with the motor shaft (4) and the NdFeB magnet (2) by injecting high-temperature aluminum liquid into a mold.

7. The rotor and shaft integrally cast structure for improving the uniform air gap of a disk motor according to claim 6, characterized in that: The rotor disk injection-molded aluminum part (1) is used for preparing a double-stator single-rotor disk type permanent magnet synchronous motor.

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