With the development of Dalian motor housing technology, some new materials and processes are gradually being applied to the manufacturing of motor housings, such as plastics, composite materials, etc. These new materials have the advantages of light weight, corrosion resistance, and good insulation performance, gradually replacing traditional metal motor casings and improving the performance and reliability of motors.

The design and manufacturing of motor housings need to consider multiple factors, including motor power, speed, working environment, safety requirements, etc. Different types of motors require motor housings with different designs to ensure their performance and safety. The motor casing can also be improved and optimized according to actual needs. For example, in some special industrial environments, it is necessary to increase the anti-corrosion and explosion-proof performance of the motor casing to ensure the stable operation and safety of the motor.

What should be paid attention to in the design of heat dissipation holes for Dalian motor shells?

The design of the heat dissipation holes in the motor casing is crucial, as it directly affects the heat dissipation effect and overall performance of the motor. The following are some key points to note when designing the heat dissipation holes of the motor housing:

Location of heat dissipation holes

Consider the distribution of heat sources: During motor operation, the heating situation varies in different parts. Usually, the stator winding and rotor are the main heat sources, so the heat dissipation holes should be arranged as close as possible to these heat sources so that the heat can be more effectively dissipated. For example, for common squirrel cage asynchronous motors, heat dissipation holes can be set near the end of the stator winding and the rotor of the motor housing.

Avoid obstruction: Ensure that there are no other components or structures around the heat dissipation hole that obstruct it, affecting air circulation and heat dissipation. For example, when designing and installing components such as brackets or junction boxes, it is necessary to avoid them blocking the heat dissipation holes and ensure that the heat dissipation channels are unobstructed.

Size and quantity of heat dissipation holes

According to the motor power and heat dissipation requirements, the larger the motor power, the more heat is generated, and correspondingly, a larger heat dissipation area and more heat dissipation holes are required to ensure the heat dissipation effect. Generally speaking, the appropriate size and quantity of heat dissipation holes can be determined through thermal analysis calculations or reference to design experience of similar power motors. For example, for small household motors, the diameter of the heat dissipation holes may be between a few millimeters and a dozen millimeters, and the number is relatively small; For large industrial motors, the diameter of the heat dissipation holes may reach several tens of millimeters, and the number is relatively large.

Taking into account the strength of the motor casing: While increasing the number and size of heat dissipation holes to improve the heat dissipation effect, attention should be paid not to excessively weaken the strength of the motor casing. The motor housing needs to withstand loads such as vibration and electromagnetic force generated during motor operation, so the layout and size of the heat dissipation holes should be maintained as much as possible to maintain the structural integrity and strength of the motor housing while ensuring heat dissipation. The contradiction between heat dissipation and strength can be resolved by reasonably distributing heat dissipation holes and using reinforcement ribs.

The shape of the heat dissipation hole

Circular hole: Circular heat dissipation holes have the advantages of low stress concentration coefficient and easy processing, and are one of the common shapes of heat dissipation holes. It can maintain the strength of the motor casing while ensuring a certain heat dissipation area, and is suitable for various types of motors.

Rectangular hole: Rectangular heat dissipation holes can be flexibly adjusted in length and width ratio according to needs, obtaining a larger heat dissipation area in a limited space, which is conducive to improving heat dissipation efficiency. However, the corners of rectangular holes are prone to stress concentration, so it is necessary to appropriately round the corners of the holes during design to reduce the degree of stress concentration and prevent damage such as cracks in the motor casing during operation.

Other shapes: In addition to circular and rectangular holes, special shapes of heat dissipation holes can also be designed according to the specific structure and heat dissipation requirements of the motor, such as elliptical holes, diamond holes, etc. These specially shaped heat dissipation holes may have better heat dissipation or spatial adaptability in certain specific situations, but they are relatively difficult to process and require comprehensive consideration of manufacturing costs and actual benefits.

Arrangement of heat dissipation holes

Uniform arrangement: evenly distributing the heat dissipation holes on the surface of the motor casing can evenly dissipate heat and avoid local overheating. This arrangement is suitable for most motors, especially those that require high uniformity of heat dissipation, such as motors in precision instruments.

Non uniform arrangement: In some cases, non-uniform arrangement of heat dissipation holes can be used due to the uneven distribution of heat sources inside the motor. For example, increasing the density of heat dissipation holes appropriately in areas with concentrated heat generation, while reducing the number of heat dissipation holes in areas with less heat generation, can improve the heat dissipation effect more targetedly, and also help optimize the structural strength and material use of the motor housing.

Ventilation channel design: In addition to the design of a single heat dissipation hole, the ventilation channel can also be designed reasonably to improve the heat dissipation effect. Connecting multiple heat dissipation holes in series or parallel to form an organized ventilation path, guiding cooling air to flow inside the motor casing, can enhance heat transfer and dissipation. For example, guide plates or ventilation slots can be installed inside the motor casing to allow cooling air to flow along a predetermined path and improve heat dissipation efficiency.

The main function of the motor casing is to protect the windings, rotors, and other key components inside the motor from external environmental damage, while also isolating and dissipating heat from the motor. In industrial production, the motor casing can not only protect the motor itself, but also protect other equipment and personnel around the motor from damage.

The design and manufacturing of the motor casing have a significant impact on the performance and lifespan of the motor. A good motor casing should have the characteristics of reasonable structure, sufficient strength, dust and water resistance, and easy maintenance. When designing the motor casing, factors such as appearance, internal space, heat dissipation structure, waterproof sealing, etc. need to be considered to ensure that the motor can work stably and reliably during operation.