EPS motor rotor magnetizing clamp

Abstract

The utility model discloses a kind of EPS motor rotor magnetizing clamps, including base and shielding shell, shielding shell is fixedly connected on the upper end of base, cavity is opened in shielding shell inside and front end surface is symmetrically provided with cooling liquid inlet and cooling liquid outlet;Pure iron yoke, pure iron yoke has multiple and multiple pure iron yokes are stacked up and down, each pure iron yoke inside is fixedly connected with several magnetic conductors that are distributed in circle equal interval, magnetizing coil is wound on each pure iron yoke, and magnetizing coil is connected by wire between;Clamp base, clamp base is rotatably connected in the low end of base, and fine adjustment dial is fixedly connected in the rear end of clamp base, the utility model is optimized by liquid cooling heat dissipation and yoke, with efficient cooling and high-precision magnetic field control, effectively solve the problem that traditional magnetizing clamp is seriously heated, magnetic field distortion and magnetic steel demagnetization etc.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor manufacturing technology, and discloses an EPS motor rotor magnetization fixture. Background Technology

[0002] Electric power steering (EPS) is a core component of automotive steering control, and its performance directly affects vehicle handling safety and driving comfort. The EPS motor rotor, as a key actuator in this system, requires a specific magnetic pole distribution through a magnetization process to ensure the stability and responsiveness of the motor's output torque. With the advancement of automotive electrification, higher demands are placed on the power density, response speed, and lifespan of EPS motors, making the precision and reliability of the rotor magnetization process a technological bottleneck in the industry.

[0003] Traditional magnetizing fixtures often employ natural air cooling or simple air cooling structures. During magnetization, the Joule heat generated by the large current flowing through the coil is difficult to dissipate quickly, leading to a rapid increase in coil temperature. Existing technologies mostly use single-pulse magnetization methods, resulting in a sinusoidal magnetic field waveform. However, magnetic field diffusion easily occurs at the pole edges, leading to insufficient rectangularity of the rotor's surface magnetic waveform. Furthermore, there is a lack of effective magnetic conduction and shielding structures.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide an EPS motor rotor magnetizing fixture that solves problems such as severe overheating of the magnetizing coil and diffusion of magnetic pole edges caused by single-pulse magnetization in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An EPS motor rotor magnetizing fixture, comprising:

[0008] The base and the shielding shell are fixedly connected to the upper end of the base. The shielding shell has a cavity inside and a coolant inlet and a coolant outlet symmetrically arranged on the front surface.

[0009] A pure iron magnetic yoke, wherein there are multiple pure iron magnetic yokes stacked one on top of the other, and each pure iron magnetic yoke has several magnetic conductors fixedly connected to its inner side in a circularly equally spaced manner, and each pure iron magnetic yoke has a magnetizing coil wound around it, and the magnetizing coils are connected to each other by wires.

[0010] A clamp base is rotatably connected to the lower end of the base, and a fine-tuning dial is fixedly connected to the rear end of the clamp base.

[0011] Furthermore, the pure iron magnetic yoke is located inside the shielding shell and is in close contact with the inner wall of the shielding shell.

[0012] Furthermore, the front end of the base is connected to two discharge wires, which extend below the shielding shell and are connected to the magnetizing coil.

[0013] Furthermore, the magnetic conductors on two adjacent pure iron yokes are staggered with the same stagger angle, the multiple magnetic conductors are stepped, and the multiple magnetic conductors form a circular channel.

[0014] Furthermore, the coolant inlet is threadedly connected to the coolant inlet shielding shell, and the interface is sealed with an O-ring.

[0015] Furthermore, the surface of the pure iron magnetic yoke is filled with insulating adhesive.

[0016] Furthermore, a temperature sensor is fixedly connected to the front end of the base, and the detection end of the temperature sensor extends into the shielding shell.

[0017] Furthermore, the upper surface of the shielding shell is provided with a feed inlet, which is circular and has a diameter slightly larger than the circular channel.

[0018] This utility model provides an EPS motor rotor magnetizing clamp, which has the following beneficial effects:

[0019] (1) This utility model effectively solves the problem of severe overheating of traditional magnetizing clamp coils by adopting an aluminum alloy shielding shell combined with a liquid-cooled coil design and a double-sealed structure for the sealed cooling channel interface.

[0020] (2) This utility model effectively improves the problems of magnetic pole edge diffusion, polarity boundary blurring and high harmonic content caused by traditional single-pulse magnetization by setting a pure iron yoke to enhance the magnetic field circuit around the coil and combining it with multi-level trapezoidal magnetic field control, thereby improving the magnetization quality of the EPS motor rotor and ensuring the stability of motor operation. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural schematic diagram of an EPS motor rotor magnetizing clamp according to the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of an EPS motor rotor magnetizing clamp according to this utility model from another angle;

[0024] Figure 3 This is a schematic diagram of the internal structure of an EPS motor rotor magnetizing clamp according to the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the shielding shell of an EPS motor rotor magnetizing clamp according to the present invention.

[0026] Figure 5 This is a schematic diagram of the pure iron magnetic yoke structure of an EPS motor rotor magnetizing clamp according to the present invention.

[0027] The components include: 1. Base; 101. Discharge wire; 2. Shielding shell; 201. Coolant inlet; 202. Coolant outlet; 203. Feed inlet; 3. Temperature sensor; 4. Pure iron yoke; 401. Magnetic conductor; 402. Magnetizing coil; 5. Fixture base; 6. Fine-tuning dial. Detailed Implementation

[0028] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-5An EPS motor rotor magnetizing fixture includes: a base 1 and a shielding shell 2. The shielding shell 2 is fixedly connected to the upper end of the base 1. The shielding shell 2 is made of aluminum alloy and can shield the external environment from interference with the magnetizing magnetic field. The shielding shell 2 has a cavity inside and a coolant inlet 201 and a coolant outlet 202 symmetrically arranged on the front surface. The coolant can enter from the coolant inlet 201 and exit from the coolant outlet 202 to achieve efficient heat dissipation for the internal components. A pure iron yoke 4 is also included. Multiple pure iron yokes 4 are stacked vertically. Each pure iron yoke 4 has several circumferentially spaced magnetic jacks fixedly connected to its inner side. The distributed magnetic conductors 401, each pure iron yoke 4 is wound with a magnetizing coil 402, and the magnetizing coils 402 are connected by wires. Multiple stacked pure iron yokes 4 form the core of the magnetic circuit. Its high magnetic permeability can efficiently concentrate and guide the magnetic field generated by the magnetizing coils 402 to the magnetizing area. The clamp base 5 is rotatably connected to the lower end of the base 1. The rear end of the clamp base 5 is fixedly connected to a fine-tuning dial 6. The rotation function of the clamp base 5, together with the fine-tuning dial 6 at the rear end, can realize the precise adjustment of the rotor placement position, ensure the relative position accuracy between the rotor and the magnetic conductors 401, and further improve the magnetization uniformity.

[0030] Specifically, the pure iron magnetic yoke 4 is located inside the shielding shell 2 and is in close contact with the inner wall of the shielding shell 2, which facilitates heat exchange.

[0031] Through the above technical solution, the pure iron magnetic yoke 4, which is closely attached to the inner wall of the shielding shell 2, can form a more compact magnetic conduction path by means of the structural constraint of the shielding shell 2, reducing the dispersion and loss of the magnetic field during transmission, enhancing the integrity of the magnetic field circuit, and thus further improving the magnetic field strength and uniformity of the magnetization area. This works in synergy with the high magnetic permeability of the pure iron magnetic yoke 4 itself to better meet the requirements of the motor for the rectangular wave magnetic field. The aluminum alloy shielding shell 2 has good thermal conductivity, and the pure iron magnetic yoke 4, which is closely attached to its inner wall, can quickly conduct the heat generated when the magnetization coil is working to the shielding shell 2. Then, the heat is efficiently removed by the cooling liquid circulation inside the shielding shell 2, which enhances the heat dissipation efficiency of the fixture.

[0032] Specifically, the coolant inlet 201 and coolant outlet 202 are threadedly connected to the shielding housing 2, and the interface is sealed with an O-ring.

[0033] Through the above technical solution, the threaded connection provides initial preload, forming an initial seal at the interface; the O-ring seal fills the micro gaps under compression, achieving dynamic sealing. This sealing structure ensures the airtightness of the coolant circulation, preventing coolant from seeping into the magnetizing coil 402 or the pure iron yoke 4, and avoiding magnetization failure due to short circuits or decreased magnetic permeability; at the same time, the threaded connection allows for quick disassembly and replacement of coolant pipelines, facilitating equipment maintenance and upgrades.

[0034] Specifically, the front end of the base 1 is connected to two discharge wires 101, which extend to the bottom of the shielding shell 2 and are connected to the magnetizing coil 402. The magnetic conductors 401 on two adjacent pure iron yokes 4 are staggered with the same stagger angle. The multi-layer magnetic conductors 401 are stepped, and multiple magnetic conductors 401 form a circular channel to accommodate the rotor.

[0035] Through the above technical solution, the magnetic conductor 401 corrects the diffusion effect at the edge of a single magnetic field by staggered superposition, making the magnetic field boundary clearer. The superposition of multiple magnetic fields can cancel high-order harmonics and improve the magnetization effect.

[0036] Specifically, the upper surface of the shielding shell 2 is provided with a feed inlet 203, which is circular and has a diameter slightly larger than that of a circular channel.

[0037] The above technical solution makes it easy to place the rotor to be magnetized into the pure iron magnetic yoke 4.

[0038] Specifically, the surface of the pure iron magnetic yoke 4 is filled with insulating glue.

[0039] By applying insulating adhesive to the surface of the pure iron magnetic yoke 4, the electrical insulation performance is improved, the mechanical structure rigidity and moisture resistance are enhanced, and the heat conduction path is optimized.

[0040] Specifically, a temperature sensor 3 is fixedly connected to the front end of the base 1. The detection end of the temperature sensor 3 extends into the shielding shell 2 to detect temperature changes in the magnetized area.

[0041] Through the above technical solution, the temperature sensor 3 can monitor the temperature change of the magnetization area in real time and can adjust the flow rate with the coolant to avoid risks such as coil insulation failure and magnet demagnetization caused by overheating, thus ensuring the continuous and stable operation of the fixture.

[0042] In use, first adjust the base angle using the fine-tuning dial 6 at the rear end of the clamp base 5, and place the EPS motor rotor to be magnetized into the circular channel formed by multiple layers of magnetic conductors 401 through the feed port 203 at the upper end of the shielded shell 2, ensuring precise alignment between the rotor and the magnetic conductors 401; then, turn on the power, and the discharge line 101 transmits the pulse current to the magnetizing coil 402. The coil generates a trapezoidal magnetic field under the magnetic guidance of the multiple layers of pure iron yoke 4, and magnetizes the rotor through the staggered magnetic conductors 401; at the same time, the coolant enters the internal cavity of the shielded shell 2 through the coolant inlet 201, circulates between the shell and the pure iron yoke 4, absorbs the heat generated by the coil operation, and is discharged from the coolant outlet 202. The temperature sensor 3 monitors the internal temperature in real time to ensure that it does not exceed the safety threshold; after magnetization is completed, turn off the power, remove the rotor, and complete one magnetization operation.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device such as a computer for control. The detailed description of known functions and components is omitted in the specific implementation of this disclosure. To ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments.

[0045] The sensors are existing products on the market, and their connection and control methods are also existing technologies, so they will not be described in detail here.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetizing fixture for an EPS motor rotor, characterized in that, include: The base (1) and the shielding shell (2) are fixedly connected to the upper end of the base (1). The shielding shell (2) has a cavity inside and a coolant inlet (201) and a coolant outlet (202) symmetrically arranged on the front surface. Pure iron magnetic yoke (4), there are multiple pure iron magnetic yokes (4) stacked one on top of the other, and each pure iron magnetic yoke (4) has several magnetic conductors (401) fixedly connected to its inner side in a circularly evenly spaced manner, and each pure iron magnetic yoke (4) has a magnetizing coil (402) wound around it, and the magnetizing coils (402) are connected to each other by wires; A clamp base (5) is rotatably connected to the lower end of the base (1), and a fine-tuning dial (6) is fixedly connected to the rear end of the clamp base (5).

2. The EPS motor rotor magnetizing fixture according to claim 1, characterized in that: The pure iron magnetic yoke (4) is located inside the shielding shell (2) and is in close contact with the inner wall of the shielding shell (2).

3. The EPS motor rotor magnetizing clamp according to claim 1, characterized in that: The base (1) has two discharge wires (101) connected to its front end. The discharge wires (101) extend to the bottom of the shielding shell (2) and are connected to the magnetizing coil (402).

4. The EPS motor rotor magnetizing fixture according to claim 1, characterized in that: The magnetic conductors (401) on two adjacent pure iron yokes (4) are staggered and have the same stagger angle. The multiple magnetic conductors (401) are stepped and form a circular channel.

5. The EPS motor rotor magnetizing fixture according to claim 1, characterized in that: The coolant inlet (201) and coolant outlet (202) are threadedly connected to the shielding shell (2), and the interface is sealed with an O-ring.

6. The EPS motor rotor magnetizing fixture according to claim 1, characterized in that: The surface of the pure iron magnetic yoke (4) is filled with insulating glue.

7. The EPS motor rotor magnetizing fixture according to claim 1, characterized in that: A temperature sensor (3) is fixedly connected to the front end of the base (1), and the detection end of the temperature sensor (3) extends into the shielding shell (2).

8. The EPS motor rotor magnetizing fixture according to claim 4, characterized in that: The upper surface of the shielding shell (2) is provided with a feed inlet (203), which is circular and has a diameter slightly larger than the circular channel.

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