Large electric wheel mining dump truck drive motor assembly

Abstract

The utility model discloses a large -scale electric wheel mining dump truck drive motor assembly, including the shell body, still include installing in the shell body tandem asynchronous motor, and tandem asynchronous motor includes two motors, and share output shaft, the output shaft both ends all stretch out the shell body, and one end is transmission end, and the other end is non -transmission end, transmission end is used to connect the speed reducer, still be equipped with brake unit on non -transmission end, the shell body is equipped with two terminal boxes, respectively correspond two motors. The utility model provides large -scale electric wheel mining dump truck drive motor assembly, and the whole motor assembly is " double -stator, double -rotor, common base, common rotating shaft " tandem structure, and two motor structure height is compact, can work -torque, power coupling output simultaneously, also can work alone and do not influence each other, and drive, brake double backup, any drive motor failure or its motor controller failure, and the whole motor assembly still can half -power smooth output.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, specifically to a drive motor assembly for a large electric wheel mining dump truck. Background Technology

[0002] The AC-DC-AC electric drive system is widely used in traditional large-tonnage rigid mining dump trucks due to its high transmission efficiency and simple, convenient control. In the AC-DC-AC electric drive system, the three-phase AC asynchronous motor is the main type of AC motor used in electric wheel dump trucks. It has advantages such as mature technology, reliable performance, simple maintenance, high power density, small size, high efficiency, high speed, and fast response. Reliability and ease of maintenance are particularly important for mining dump trucks, hence its widespread application.

[0003] When driving large-tonnage electric wheel mining trucks, the overall vehicle power requirement is high. Considering the current limitations of hardware modules and cost factors, industrial converter manufacturers mainly use several ultra-high voltage platforms such as 1500V, 1800V, and 2600V for intermediate DC voltage. The electric wheel drive motor will also be designed to match the ultra-high voltage platform of the vehicle, such as the selection of motor insulation materials and insulation structure, wire size and structure, electrical clearance and creepage distance, and motor turn-to-turn and ground withstand voltage values.

[0004] As the voltage level of a motor increases, its capacity also increases, which in turn raises the performance and capacity requirements of the matching motor controller. Although the ultra-high voltage platform current of a motor of the same power is reduced, factors such as the cost and reliability risks of the insulation system, the difficulty of insulation process, the increase in electrical clearance and creepage distance, the increase in later operating costs, and the strict requirements for the operating environment will all increase the design cost of the motor. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a large electric wheel mining dump truck drive motor assembly, which solves the problem of increased motor design cost caused by the increase of voltage level in the existing technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a large electric wheel mining dump truck drive motor assembly, including a housing, and a series asynchronous motor installed in the housing, wherein the series asynchronous motor includes two motors and shares an output shaft.

[0007] The output shaft extends out of the outer casing at both ends, with one end being the transmission end and the other end being the non-transmission end.

[0008] The transmission end is used to connect to the reducer, and the non-transmission end is also equipped with a braking unit.

[0009] The outer casing has two junction boxes, each corresponding to one of the two motors.

[0010] This utility model also has the following technical features:

[0011] The outer shell is generally cylindrical, including a cylindrical shell body and a first end plate and a second end plate covering both ends of the cylindrical shell body. The output shaft extending out of the first end plate is the transmission end, and the output shaft extending out of the second end plate is the non-transmission end.

[0012] The shell is also provided with an air inlet and an air outlet. The air inlet is located on the side of the shell near the second end plate, and the air outlet is located on the side of the shell near the first end plate.

[0013] An air outlet cover is also installed on the air outlet.

[0014] A first bearing is installed at the connection between the output shaft and the first end plate, and a second bearing is installed at the connection between the output shaft and the second end plate.

[0015] Flanges are also installed on opposite sides of the shell.

[0016] The first end plate is also equipped with a boss.

[0017] The transmission end is also equipped with a grounding device.

[0018] The non-transmission end is also equipped with two independent sets of low-voltage rotary transformer quick-connect plugs.

[0019] A braking unit is also installed on the non-transmission end.

[0020] The braking unit includes a brake disc mounted on the non-transmission end and a service brake caliper and a parking brake caliper mounted on the second end plate, wherein the service brake caliper and the parking brake caliper cooperate with the brake disc.

[0021] Compared with the prior art, this utility model has the following technical effects:

[0022] (I) The large electric wheel mining dump truck drive motor assembly provided by this utility model has a series structure of "double stator, double rotor, common frame, and common shaft". The two motors are highly compact and can work simultaneously with torque and power coupling output, or work independently without affecting each other. It has dual backup for drive and braking. If any drive motor fails or its motor controller fails, the entire motor assembly can still output power smoothly at half power.

[0023] (II) The large electric wheel mining dump truck drive motor assembly provided by this utility model has technical indicators such as insulation structure, wire specifications, electrical clearance, and creepage distance that match the DC800V platform system of the whole vehicle. It adopts the existing mature and reliable insulation system in the motor industry, which greatly reduces the research and development cost and process cost of the insulation system and ensures the reliability of the motor operation in the later stage.

[0024] (III) The large electric wheel mining dump truck drive motor assembly provided by this utility model has a simple structure, is easy to operate, safe and reliable, and has strong adaptability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0026] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0027] Figure 3 This is a schematic diagram of the external structure of this utility model.

[0028] The meanings of the labels in the attached diagram are as follows:

[0029] 1-Outer casing, 2-Series asynchronous motor, 3-Output shaft, 4-Brake unit, 5-Junction box, 6-First bearing, 7-Second bearing.

[0030] 1-1-Shell body, 1-2-First end plate, 1-3-Second end plate, 1-4-Air inlet, 1-5-Air outlet, 1-6-Air outlet cover, 1-7-Flange, 1-8-Boss.

[0031] 4-1-Brake disc, 4-2-Service brake caliper, 4-3-Parking brake caliper.

[0032] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0033] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0034] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0035] Example 1:

[0036] This embodiment provides a drive motor assembly for a large electric wheel mining dump truck, such as... Figures 1-3As shown, it includes a housing 1 and a series asynchronous motor 2 installed inside the housing 1. The series asynchronous motor 2 includes two motors that share an output shaft 3.

[0037] The output shaft 3 extends out of the housing 1 at both ends, one end being the transmission end and the other end being the non-transmission end; the transmission end is used to connect to the reducer, and the non-transmission end is also equipped with a braking unit 4; two junction boxes 5 are installed on the housing 1, corresponding to two motors respectively.

[0038] This embodiment applies to the DC800V platform. The technical specifications of the entire motor assembly, such as electromagnetic design, wire specifications, insulation structure, electrical clearance, and creepage distance, need to match the DC800V platform of the vehicle.

[0039] In this embodiment, the series asynchronous motor 2 adopts a 2*Y series three-phase squirrel-cage AC asynchronous motor with a "dual stator, dual rotor, common frame, and common shaft" series connection structure. The power and torque output of each Y motor are finally combined and output through the output shaft of the motor assembly. Although the power and current of a single Y motor are greatly reduced, the power and current capacity are significantly improved compared to the conventional DC600V platform. This not only meets the power and torque requirements of the large electric wheel mining truck, but also facilitates the selection and matching control of the motor controller, thus reducing the overall vehicle cost.

[0040] In this embodiment, two separate junction boxes 5 are used to lead high-voltage cables to the motor controller, which makes it convenient for users to install and remove cables. At the same time, the addition of junction boxes 5 can shield the interference caused by EMC of high-voltage cables and avoid affecting the acquisition of low-voltage signals.

[0041] In this embodiment, the two motor junction boxes 5 quickly connect the U / V / W three-phase copper busbars inside the motor to the three-phase high-voltage cable connector connected by the user through fastening bolts, which facilitates the user's disassembly and assembly of the cable during later maintenance.

[0042] As a preferred embodiment:

[0043] The outer shell 1 is generally cylindrical, including a cylindrical shell body 1-1 and a first end plate 1-2 and a second end plate 1-3 covering both ends of the cylindrical shell body 1-1. The output shaft 3 extends out of the first end plate 1-2 as the transmission end, and extends out of the second end plate 1-3 as the non-transmission end.

[0044] As a preferred embodiment:

[0045] The shell 1-1 is also provided with an air inlet 1-4 and an air outlet 1-5. The air inlet 1-4 is located on the shell 1-1 near the second end plate 1-3, and the air outlet 1-5 is located on the shell 1-1 near the first end plate 1-2.

[0046] An air outlet cover 1-6 is also installed on the air outlet 1-5.

[0047] The entire motor assembly adopts a forced air cooling method. Air enters through the air inlets 1-4 on the non-drive side of the motor. The cooling air passes through the axial ventilation holes of the stator and rotor of the entire motor and the air gap between the stator and rotor, dissipating the heat generated by the motor from the radial air outlets 1-5 on the drive side of the motor, which is more conducive to the ventilation and heat dissipation of the motor.

[0048] As a preferred embodiment:

[0049] A first bearing 6 is installed at the connection between the output shaft 3 and the first end plate 1-2, and a second bearing 7 is installed at the connection between the output shaft 3 and the second end plate 1-3.

[0050] The output shaft 3 is fixed at both ends by bearings, which are grease-lubricated, and bearing grease filling ports are provided.

[0051] As a preferred embodiment:

[0052] Flanges 1-7 are also installed on opposite sides of the shell 1-1.

[0053] The first end plate 1-2 is also equipped with a boss 1-8.

[0054] The transmission end is also equipped with a grounding device, which introduces the generated shaft current into the zero potential point of the whole vehicle through an equipotential cable, so as to avoid damage to the motor bearings by the shaft voltage or shaft current generated during motor operation.

[0055] The non-transmission end is also equipped with two independent sets of low-voltage rotary transformer quick-connect plugs.

[0056] In this embodiment, flanges 1-7 and bosses 1-8 are fitted with the reducer. The flanges are fixed to the reducer by the flange stop and six M30 bolts, and the four boss stops serve as guides.

[0057] In this embodiment, two independent sets of low-voltage rotary transformer quick-connect plugs are installed on the non-drive end, which integrate the acquisition and analysis of signals such as stator winding temperature, bearing temperature and motor speed, making it easier for users to disassemble and install. The rotary transformer is designed with a protective cover to prevent personnel from stepping on and damaging the plugs and to shield external interference to the signals.

[0058] As a preferred embodiment:

[0059] The braking unit 4 includes a brake disc 4-1 mounted on the non-transmission end and a service brake caliper 4-2 and a parking brake caliper 4-3 mounted on the second end plate 1-3. The service brake caliper 4-2 and the parking brake caliper 4-3 cooperate with the brake disc 4-1.

[0060] The specific working process of this utility model:

[0061] The entire motor assembly adopts a 2*Y series three-phase AC asynchronous motor with a "dual stator, dual rotor, common frame, and common shaft" series structure. The power and torque output of each Y motor are finally combined and output through the output shaft of the motor assembly. The two motors have a highly compact structure, which can work simultaneously with torque and power coupled output, or work independently without affecting each other, providing dual backup for drive and braking. If any drive motor fails or its motor controller fails, the entire motor assembly can still output power smoothly at half power.

[0062] Although the power and current of a single Y motor are greatly reduced, the power and current capacity are significantly improved compared to the conventional DC600V platform. This not only meets the power and torque requirements of large electric wheel mining trucks, but also facilitates the selection and matching of motor controllers, thus reducing the overall vehicle cost.

[0063] The above technical solutions are only preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art without creative effort within the technical scope disclosed in this utility model are covered within the protection scope of this utility model.

Claims

1. A large electric drive motor assembly for a mine dump truck, comprising an outer housing (1), characterized in that, It also includes a series asynchronous motor (2) installed in the housing (1), the series asynchronous motor (2) comprising two motors and sharing an output shaft (3); The output shaft (3) extends out of the outer shell (1) at both ends, with one end being the transmission end and the other end being the non-transmission end; The transmission end is used to connect to the reducer, and the non-transmission end is also equipped with a braking unit (4); Two junction boxes (5) are installed on the outer casing (1), each corresponding to one of the two motors.

2. The large electrically driven wheeled mining dump truck drive motor assembly of claim 1, wherein, The outer shell (1) is generally cylindrical, including a cylindrical shell body (1-1) and a first end plate (1-2) and a second end plate (1-3) covering both ends of the cylindrical shell body (1-1). The output shaft (3) extends out of the first end plate (1-2) as the transmission end, and extends out of the second end plate (1-3) as the non-transmission end.

3. The large electrically driven wheeled mining dump truck drive motor assembly of claim 2, wherein, The shell (1-1) is also provided with an air inlet (1-4) and an air outlet (1-5). The air inlet (1-4) is located on the shell (1-1) near the second end plate (1-3), and the air outlet (1-5) is located on the shell (1-1) near the first end plate (1-2). An air outlet cover (1-6) is also installed on the air outlet (1-5).

4. The large electrically driven wheeled mining dump truck drive motor assembly of claim 3, wherein, A first bearing (6) is installed at the connection between the output shaft (3) and the first end plate (1-2), and a second bearing (7) is installed at the connection between the output shaft (3) and the second end plate (1-3).

5. The large electrically driven wheeled mining dump truck drive motor assembly of claim 3, wherein, Flanges (1-7) are also installed on opposite sides of the shell (1-1); The first end plate (1-2) is also equipped with a boss (1-8); The transmission end is also equipped with a grounding device; The non-transmission end is also equipped with two independent sets of low-voltage rotary transformer quick-connect plugs.

6. The large electrically driven wheeled mining dump truck drive motor assembly of claim 2, wherein, The braking unit (4) includes a brake disc (4-1) mounted on the non-transmission end and a service brake caliper (4-2) and a parking brake caliper (4-3) mounted on the second end plate (1-3). The service brake caliper (4-2) and the parking brake caliper (4-3) cooperate with the brake disc (4-1).

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