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Something you need to know about EV motor housing processing techonlogy

With the vigorous development of the new energy automobile industry, the performance and efficiency of the motor, as one of its core components, directly affect the performance of the entire vehicle. As the basic support structure of the motor, the motor housing’s processing quality is directly related to the stability and durability of the motor.

Technical route for motor housing processing

As a packaging structure, the motor housing’s primary task is to protect the key components inside the electric drive system, such as the motor, controller and reducer, etc., from external dust, moisture, chemical substances and other contamination, and to prevent mechanical impact. and collision damage.

The processing technology route of motor housing mainly includes the following steps:

Material selection and pretreatment: Select appropriate aluminum alloy materials and perform preheating treatment to reduce deformation during processing.

Rough machining: Use large CNC machine tools for rough machining to quickly remove excess material and form the preliminary shape of the shell.

Semi-finishing: further processing to ensure that the dimensions of each part of the shell are close to the final requirements.

Finishing: Use high-precision processing equipment and cutting tools for precision processing to ensure the dimensional accuracy and surface finish of the shell.

Heat treatment: The shell is heat treated to improve the mechanical properties and stability of the material.

Final inspection: Comprehensive inspection of the finished shell to ensure it meets design and performance requirements.

motor housing

In the future, motor housing processing technology will pay more attention to intelligence, automation and greenness. Integrated intelligent manufacturing systems, adaptive control technology and the application of sustainable materials will be key factors driving the development of the industry.

Without engines and complex transmissions, batteries, motors, and electronic controls have become the core key components of pure electric vehicles. Since these “three electric” parts are structurally different from traditional fuel vehicles, the processing technology is also different.

Take the motor as an example. The motor is mainly composed of a casing, front and rear end covers, a shaft, a stator, a rotor and a wiring harness. Among them, the performance of the casing, front and rear end covers, shaft, stator, and rotor is closely related to the processing level.

Motor housing processing, rear end cover processing and motor shaft processing mainly involve boring and grinding.

The drive motor casing of pure electric vehicles is usually made of aluminum alloy to meet the lightweight requirements of the vehicle, and its hole diameter generally exceeds 250mm.

The main processing difficulties include: first, the large-diameter hole, IT6 tolerance level; second, the high shape and position tolerance requirements of the main hole and the bearing hole; the shell is a thin-walled part, which is prone to deformation and vibration.

CNC machining

In order to finish machining such a large-diameter deep hole, as well as the bearing hole and mounting hole above, the requirements for the tool are very high. Generally, lightweight boring tools are used to mill various types of thin-walled and unstable shells to ensure accuracy and quality.