A rectifier device with compact structure and efficient heat dissipation for high-speed motors

Abstract

The present application discloses a rectifier device for high-speed motors with a compact structure and efficient heat dissipation, comprising: a support disc; a plurality of rectifier diode modules and a plurality of varistor protection modules for connecting to form a rectifier circuit; the support disc is provided with a plurality of penetrating heat dissipation holes distributed along the circumference, and the rectifier diode modules and varistor protection modules are both disposed within the heat dissipation holes. The present application adopts a modular design, resulting in a compact structure, a small axial length, and a light overall weight. Furthermore, the hollow design allows cool air to flow directly through the holes in the disc, forming a smoother airflow path. Furthermore, as the cool air flows through the holes, it comes into direct contact with the rectifier diodes and other circuit components for cooling, greatly improving the cooling effect.

Description

Technical Field

[0001] The present application relates to a rectifier device for a high-speed motor with a compact structure and efficient heat dissipation, belonging to the technical field of high-speed motor structure design. Background Art

[0002] The operation of high-speed motors depends on rectifier circuits. Figure 1 This is one of the most common rectifier circuits, which specifically includes components such as diodes, varistors, and heat sinks. Existing high-speed motors generally place the components involved in the rectifier circuit on a rectifier disk device, which is then placed at the end of the motor. Common rectifier disk devices generally use a two-branch parallel full-wave rectifier circuit with a double-sided disk structure. Figure 2-1 and Figure 2-2 , 6 rectifier diodes on each side are fixed on the inner circle of the disk, and the diode protection components are also arranged on both sides. The two disks are fixed to the motor shaft by the insulating support plate in the middle. This mechanical structure and electrical connection are relatively complex, large in size, heavy in weight, and high in cost. It occupies a large axial space of the motor, making the tail end of the motor too long and the suspended mass large, which is prone to resonance. In addition, the rigidity of the motor tail end is low, it is sensitive to excitation, and the motor operation is unstable; more importantly, when the double-sided disk structure is ventilated and cooled, only one side of the components is directly cooled by the wind, and the ventilation and heat dissipation performance is poor. Summary of the Invention

[0003] The technical problem to be solved by the present application is that the existing rectifier disk adopts a double-sided disk structure, resulting in poor ventilation and heat dissipation performance.

[0004] In order to solve the above technical problems, the technical solution of the present application is to provide a rectifier device for a high-speed motor with a compact structure and efficient heat dissipation, comprising:

[0005] Support plate;

[0006] Multiple rectifier diode modules and multiple varistor protection modules are connected to form a rectifier circuit;

[0007] The support disc is provided with a plurality of penetrating heat dissipation holes distributed along the circumference, and the rectifier diode module and the varistor protection module are both arranged in the heat dissipation holes.

[0008] Preferably, the heat dissipation holes are arranged to be evenly distributed at 45° along the circumference of the support plate.

[0009] Preferably, the rectifier diode module includes a positive diode, a negative diode, and a first base, wherein the positive diode and the negative diode are arranged on the first base and connected in series; the first base is connected to the support plate. Furthermore, the first base is provided with a heat dissipation groove.

[0010] Preferably, the varistor protection module includes a second base and four varistors, where two varistors are connected in series and then in parallel; the second base is connected to the supporting disc.

[0011] The advantages of this application are that it adopts a modular design, has a compact structure, a small axial length and a light overall weight; at the same time, it adopts a hollow design, so that the cold air can directly form a passage through the holes on the disk body, and the air path is smoother. Moreover, when the cold air flows through the holes, it is in direct contact with the circuit components such as the rectifier diode for cooling, and the cooling effect is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the circuit schematic diagram of the rectifier circuit;

[0013] Figure 2-1 It is a schematic diagram of the rectifier disk structure in the prior art; Figure 2-2 for Figure 2-1 AA cross-sectional view of the structure shown;

[0014] Figure 3 A schematic structural diagram of a rectifier device provided in an embodiment;

[0015] Figure 4 This is a structural diagram of a rectifier diode module provided in an embodiment;

[0016] Figure 5-1 This is a schematic structural diagram of the second base of the varistor protection module provided in the embodiment; Figure 5-2 for Figure 5-1 Schematic diagrams of the structure in the C and D directions;

[0017] Figure 6-1 A schematic diagram of the varistor structure of the varistor protection module provided in the embodiment; Figure 6-2 Schematic diagram of a varistor viewed from above;

[0018] Reference numerals: supporting disc 1 , rectifier diode module 2 , positive diode 21 , negative diode 22 , first base 23 , varistor protection module 3 , second base 31 , varistor 32 , heat dissipation hole 4 . DETAILED DESCRIPTION

[0019] In order to make the present application more clear and easy to understand, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0020] Example

[0021] This embodiment provides a rectifier device for a high-speed motor with a compact structure and high heat dissipation efficiency. Figure 3, including a support disc 1; a plurality of heat dissipation holes 4 are opened along the circumference of the support disc 1 as heat dissipation holes, and the components such as diodes and varistors required for the rectifier circuit are arranged in the heat dissipation holes 4 in a modular manner, specifically a rectifier diode module 2 and a varistor protection module 3. Figure 4 , including a positive diode 21, a negative diode 22 and a first base 23, the first base 23 is fixedly connected to the support disc 1, and the fixing method can be a radial fastening bolt fixing method, the positive diode 21 and the negative diode 22 are fixedly arranged on the first base 23, and the positive diode 21 and the negative diode 22 are connected in series to form Figure 1 A rectifier diode branch in the rectifier circuit shown in FIG. 1; a heat dissipation slot is provided on the first base 23, and the first base 23 plays the role of conducting, dissipating heat and fixing. The varistor protection module 3 includes a second base 31 (see Figure 5-1 、 Figure 5-2 ) and four varistors 32 (see Figure 6-1 、 Figure 6-2 ), the varistor 32 is fixedly arranged on the second base 31, and the four varistor 32 are connected in series and then in parallel to form Figure 1 The two varistors in the rectifier circuit are connected in series; the second base 31 is fixedly connected to the support plate 1, and the second base 31 plays the role of conducting, dissipating heat and fixing.

[0022] See again Figure 1 The rectifier device adopts a modular design. The heat dissipation holes 4 are evenly distributed at 45 degrees along the circumference of the support disc 1. There are eight heat dissipation holes 4 in total. The six rectifier diode modules 2 provide six rectifier diode branches. The two varistor protection modules 3 provide four varistor series branches. Parallel rings are set on the front and back sides of the support disc 1 to connect the above branches in parallel to the positive and negative poles of the motor excitation winding respectively. The exciter rotor lead wires are correspondingly connected to the rectifier diode branches, and finally formed. Figure 1 The rectifier circuit shown.

[0023] The present application provides a rectifier device for high-speed motors with a compact structure and efficient heat dissipation, which has a compact structure, a small axial length and a light overall weight. The overall structure adopts a single-disc (support disk) structure. In order to meet the requirements of dual-branch parallel connection, the disk body adopts a hollow design, and the components adopt a modular design, that is, the two positive and negative rectifier diodes are integrated into a diode module with a heat sink, and the four originally independent varistors (diode protection elements) are integrated into a resistor module. The rectifier diode module and the varistor module are installed in the holes on the disk body and are evenly distributed at a 45° angle in the circumferential direction. In addition to being the electrical connection conductor and heat sink of the module, the base also plays a role in connecting and fixing with the disk body. The structure is adapted to the holes on the disk body, which simplifies the disk body structure and is easy and simple to install. The axial size of the disk body can be made very small and the weight is very light, and additional electrical connections between components are also eliminated.

[0024] This structural solution adopts a single-disc design and fully utilizes the axial space of the disk, which reduces the overall weight and axial length. Since the components adopt a modular design and the disk adopts a unique hollow structure, the device structure and electrical connection are simplified. For existing rectifier devices, in order to arrange 12 rectifier diodes and 8 varistors, a double-disc structure is required. Each component needs to be individually fastened to the disk, and each independent component needs to be connected through a special conductor design, which increases the complexity of the device, occupies a large axial space, and is heavy. Compared with existing rectifier devices, the axial length of the present invention is reduced by about 200mm and the total weight is reduced by about 150kg. The axial dimension of the tail end of the motor is reduced, the hanging weight is reduced, and the stiffness of the tail end of the motor is greatly improved, thereby increasing the critical speed and enhancing the stability of the motor operation.

[0025] At the same time, the rectifier disc adopts a hollow design, and the cold air can directly form a passage through the holes on the disc, making the wind path smoother. Moreover, when the cold air flows through the holes, it comes into direct contact with the rectifier diodes and other circuit components for cooling, greatly improving the cooling effect.

Claims

1. A rectifier device for a high-speed motor with a compact structure and high heat dissipation efficiency, characterized in that: include: Supporting disc (1); A plurality of rectifier diode modules (2) and a plurality of varistor protection modules (3) are connected to form a rectifier circuit; The support disc (1) is provided with a plurality of penetrating heat dissipation holes (4) distributed along the circumference, and the rectifier diode module (2) and the varistor protection module (3) are both arranged in the heat dissipation holes (4); The heat dissipation holes (4) are arranged to be evenly distributed at 45° along the circumference of the support plate (1); The rectifier diode module (2) comprises a positive diode (21), a negative diode (22) and a first base (23); the positive diode (21) and the negative diode (22) are arranged on the first base (23), and the positive diode (21) and the negative diode (22) are connected in series; the first base (23) is connected to the supporting disc (1); The first base (23) is provided with a heat dissipation groove; The varistor protection module (3) comprises a second base (31) and four varistors (32), wherein two of the four varistors (32) are connected in series and then in parallel; The second base (31) is connected to the supporting disc (1).

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