A motor controller

Abstract

The utility model discloses a motor controller, including control box and control circuit board, control box is equipped with inner chamber, and control circuit board is installed in the inner chamber, and control circuit board is equipped with a plurality of IGBT module, and the heat dissipation bottom surface of each IGBT module is pasted in the inner chamber bottom surface of control box, and the heat dissipation surface of IGBT module is padded with insulating heat pad between the inner chamber bottom surface, and every two IGBT module groups are a group, and the upper portion of each group IGBT module is equipped with insulating support, and the bottom of insulating support is correspondingly equipped with two positioning slots with IGBT module, and IGBT module is clamped in the positioning slot, and the first through -hole is equipped between two positioning slots, and the screw hole is equipped with in the inner chamber bottom surface of control box, and the middle part of a screw passes through the first through -hole, and its tail portion is fixed in the screw hole, and insulating support passes through screw and press IGBT module on the inner chamber bottom surface. IGBT module is fixed in the inner chamber bottom surface, and installation is more convenient, and the positioning slot of insulating support prevents IGBT module displacement.

Description

Technical Field

[0001] This utility model relates to a motor controller. Background Technology

[0002] Traditional motor controllers consist of a control box and a control circuit board. The control box has an internal cavity, and the control circuit board is installed inside the cavity. The control circuit board has several pairs of IGBT modules. Since IGBT modules are heat-generating devices, heat dissipation needs to be considered. There are two common heat dissipation methods: one is to install heat sinks behind the heat dissipation surface of the IGBT module, but heat sinks are large and require a lot of space; the other is to attach the IGBT module to the side wall of the cavity and fix it with screws and pressure rods to make the IGBT module fit tightly against the side wall of the cavity, so that the heat is discharged outside the control box. However, this structure is inconvenient to install. During the installation process, the pressure rod is prone to displacement and stress deformation, which can lead to uneven stress damage and local breakage of the IGBT module. Moreover, since the screws are conductors, the spacing between the IGBT modules is required to be high, otherwise the creepage requirements will not be met. This has great limitations and a limited range of applications. Utility Model Content

[0003] This invention provides a motor controller to solve the problem of inconvenient installation of IGBT modules on the inner wall of the control box in the prior art.

[0004] The technical solution of this utility model is implemented as follows:

[0005] The purpose of this utility model is to provide a motor controller, including a control box and a control circuit board. The control box has an inner cavity, and the control circuit board is installed inside the inner cavity. The control circuit board has several IGBT modules, and the heat dissipation bottom surface of each IGBT module is attached to the bottom surface of the inner cavity of the control box. The key feature is that an insulating thermally conductive pad is placed between the heat dissipation surface of the IGBT module and the bottom surface of the inner cavity. Every two IGBT modules are grouped together, and an insulating bracket is installed above each group of IGBT modules. The bottom of the insulating bracket has two positioning grooves corresponding to the IGBT modules. The IGBT modules are stuck in the positioning grooves. A first through hole is provided between the two positioning grooves. The control box has a screw hole on the bottom surface of the inner cavity. The middle part of a screw passes through the first through hole, and its tail is fixed in the screw hole. The insulating bracket presses the IGBT modules onto the bottom surface of the inner cavity through the screw.

[0006] The bottom of the aforementioned insulating bracket has a sleeve protruding downwards around the first through hole. The control box has a countersunk hole on the bottom surface of its inner cavity. The screw hole is located in the countersunk hole, and the sleeve extends into the countersunk hole.

[0007] The control box described above has several mounting bosses on the bottom surface of its inner cavity. Each mounting boss has a set of IGBT modules mounted on it, and the countersunk holes are located inside the mounting bosses.

[0008] The insulating bracket described above is equipped with a pressure plate on its top. The pressure plate has a second through hole in its middle that corresponds to the first through hole. The middle part of the screw passes through the second through hole and then through the first through hole, and the screw presses the pressure plate onto the insulating bracket.

[0009] The top of the aforementioned insulating bracket has two parallel limiting strips protruding along its length, forming a mounting groove between the two limiting strips. The first through hole is located in the mounting groove, and the pressure plate is installed in the mounting groove.

[0010] The top surface of the aforementioned insulating bracket is connected to the limiting strip by several reinforcing ribs.

[0011] The control box described above has several heat dissipation fins protruding from the bottom below the mounting boss.

[0012] Each of the aforementioned insulating thermal pads is placed below a set of IGBT modules, and the insulating thermal pads are provided with a third through hole corresponding to the sleeve.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] 1. The motor controller includes a control box and a control circuit board. The control box has an inner cavity, and the control circuit board is installed inside the inner cavity. The control circuit board has several IGBT modules, and the heat dissipation bottom surface of each IGBT module is attached to the bottom surface of the inner cavity of the control box. The controller is characterized in that: an insulating thermally conductive pad is placed between the heat dissipation surface of the IGBT module and the bottom surface of the inner cavity; every two IGBT modules form a group; an insulating bracket is installed above each group of IGBT modules; the bottom of the insulating bracket has two positioning grooves corresponding to the IGBT modules; the IGBT modules are inserted into the positioning grooves; a first through hole is provided between the two positioning grooves; the control box has screw holes on the bottom surface of the inner cavity; the middle part of a screw passes through the first through hole, and its tail is fixed in the screw hole; the insulating bracket presses the IGBT modules onto the bottom surface of the inner cavity using screws. Fixing the IGBT modules to the bottom surface of the inner cavity makes installation more convenient; the insulating bracket strengthens the creepage distance between IGBT modules, increasing safety in the motor control box; the positioning grooves of the insulating bracket prevent the IGBT modules from shifting.

[0015] 2. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of the motor controller provided in this embodiment of the utility model;

[0017] Figure 2 for Figure 1 Enlarged view of point A;

[0018] Figure 3 This is an exploded view of the motor controller.

[0019] Figure 4 This is a top view of the motor controller;

[0020] Figure 5 for Figure 4 BB section view;

[0021] Figure 6 for Figure 5 Enlarged view of point C;

[0022] Figure 7 This is a schematic diagram of the insulating support structure in the motor controller;

[0023] Figure 8 This is a schematic diagram of the insulating support structure from another angle;

[0024] Figure 9 This is a schematic diagram of the control box in a motor controller. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figures 1 to 9 As shown, this embodiment provides a motor controller, including a control box 1 and a control circuit board 2. The control box 1 has an inner cavity 10, and the control circuit board 2 is installed in the inner cavity 10. The control circuit board 2 has a plurality of IGBT modules 21, and the heat dissipation bottom surface of each IGBT module 21 is attached to the bottom surface 11 of the inner cavity of the control box 1. The characteristic is that: an insulating thermal pad 4 is placed between the heat dissipation surface of the IGBT module 21 and the bottom surface 11 of the inner cavity. Every two IGBT modules 21 are grouped together, and an insulating bracket 5 is installed above each group of IGBT modules 21. The bottom of the insulating bracket 5 is provided with two positioning grooves 52 corresponding to the IGBT modules 21. The IGBT modules 21 are stuck in the positioning grooves 52. A first through hole 51 is provided between the two positioning grooves 52. The control box 1 has a screw hole 12 on the bottom surface 11 of the inner cavity. The middle part of a screw 6 passes through the first through hole 51, and its tail is fixed in the screw hole 12. The insulating bracket 5 presses the IGBT modules 21 onto the bottom surface 11 of the inner cavity through the screw 6.

[0027] The motor controller has IGBT modules 21 fixed on the bottom surface 11 of the inner cavity, making installation more convenient; the insulating bracket 5 strengthens the creepage distance between IGBT modules 21, increasing safety in the motor control box; the positioning groove 52 of the insulating bracket 5 prevents the IGBT modules 21 from shifting.

[0028] The bottom of the aforementioned insulating bracket 5 has a sleeve 53 protruding downwards from the periphery of the first through hole 51. The control box 1 has a countersunk hole 13 on the bottom surface 11 of its inner cavity, and the screw hole 12 is located inside the countersunk hole 13. The sleeve 53 extends into the countersunk hole 13. After the insulating bracket 5 wraps around the screw 6 and passes through the insulating thermal pad 4, it sinks into the control box 1 and locks in place. This ensures a safe creepage distance between the screw 6 and the control box 1 and the bottom and sides of the IGBT module 21, making the minimum gap greater than 5mm, thus increasing the safety of the motor controller.

[0029] The control box 1 described above has several mounting bosses 14 on the bottom surface 11 of the inner cavity. A set of IGBT modules 21 are mounted on top of each mounting boss 14. The countersunk hole 13 is set inside the mounting boss 14.

[0030] The insulating bracket 5 described above is equipped with a pressure plate 3 on its top. The pressure plate 3 has a second through hole 31 in its middle, corresponding to the first through hole 51. The screw 6 passes through the second through hole 31 and then through the first through hole 51, pressing the pressure plate 3 onto the insulating bracket 5. The pressure plate 3 ensures that the force of the screw 6 acts directly on the insulating bracket 5, resulting in a wide force distribution surface and avoiding concentrated force damage to the device.

[0031] The insulating bracket 5 described above has two parallel limiting strips 55 protruding from its top along its length, forming a mounting groove 54 between the two limiting strips 55. The first through hole 51 is located within the mounting groove 54, and the pressure plate 3 is installed within the mounting groove 54. The limiting strips 55 prevent the pressure plate 3 from shifting.

[0032] The top surface of the aforementioned insulating bracket 5 is connected to the limiting strip 55 by a number of reinforcing ribs 56.

[0033] The control box 1 described above has several heat dissipation fins 15 protruding from its bottom below the mounting boss 14. The heat dissipation fins 15 enhance the heat dissipation effect of the motor controller.

[0034] Each of the aforementioned insulating thermal pads 4 is placed below a set of IGBT modules 21, and the insulating thermal pad 4 has a third through hole 41 corresponding to the sleeve 53. The installation of the insulating thermal pad 4 is more convenient.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A motor controller, comprising a control box (1) and a control circuit board (2), wherein the control box (1) has an inner cavity (10), the control circuit board (2) is installed in the inner cavity (10), and the control circuit board (2) is provided with a plurality of IGBT modules (21), the heat dissipation bottom surface of each IGBT module (21) being attached to the bottom surface (11) of the inner cavity of the control box (1), characterized in that: An insulating thermal pad (4) is placed between the heat dissipation surface of the IGBT module (21) and the bottom surface of the inner cavity (11). Two IGBT modules (21) are grouped together. An insulating bracket (5) is installed above each group of IGBT modules (21). The bottom of the insulating bracket (5) is provided with two positioning grooves (52) corresponding to the IGBT module (21). The IGBT module (21) is stuck in the positioning groove (52). A first through hole (51) is provided between the two positioning grooves (52). The control box (1) is provided with a screw hole (12) on the bottom surface of the inner cavity (11). The middle part of a screw (6) passes through the first through hole (51), and its tail is fixed in the screw hole (12). The insulating bracket (5) presses the IGBT module (21) onto the bottom surface of the inner cavity (11) through the screw (6).

2. The motor controller according to claim 1, characterized in that: The bottom of the insulating bracket (5) has a sleeve (53) protruding downwards from the periphery of the first through hole (51). The control box (1) has a countersunk hole (13) on the bottom surface (11) of the inner cavity. The screw hole (12) is located in the countersunk hole (13), and the sleeve (53) extends into the countersunk hole (13).

3. A motor controller according to claim 2, characterized in that: The control box (1) has several mounting bosses (14) on the bottom surface (11) of the inner cavity. Each mounting boss (14) has a set of IGBT modules (21) mounted on it. The countersunk hole (13) is set inside the mounting boss (14).

4. A motor controller according to claim 2 or 3, characterized in that: The top of the insulating bracket (5) is fitted with a pressure plate (3). The middle of the pressure plate (3) is provided with a second through hole (31) corresponding to the first through hole (51). The middle of the screw (6) passes through the second through hole (31) and then through the first through hole (51). The screw (6) presses the pressure plate (3) onto the insulating bracket (5).

5. A motor controller according to claim 4, characterized in that: The top of the insulating bracket (5) has two parallel limiting strips (55) protruding along the length direction, and an installation groove (54) is formed between the two limiting strips (55). The first through hole (51) is located in the installation groove (54), and the pressure plate (3) is installed in the installation groove (54).

6. A motor controller according to claim 5, characterized in that: A number of reinforcing ribs (56) are connected between the top surface of the insulating bracket (5) and the limiting strip (55).

7. A motor controller according to claim 6, characterized in that: The bottom of the control box (1) has several heat dissipation ribs (15) protruding below the mounting boss (14).

8. A motor controller according to claim 7, characterized in that: Each of the insulating thermal pads (4) is placed under a set of IGBT modules (21), and the insulating thermal pads (4) are provided with a third through hole (41) corresponding to the sleeve (53).

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