The pivot joint is fixed at the position of the motor stator base, ensuring an appropriate gap between the rotor and the stator. Of course, there must also be a clearance between the shaft core and the bearings to prevent the shaft core from becoming locked and thus unable to function. The stator structure of the motor—hereafter referred to as the "stator"—is designed in such a way that, once power is supplied, an induced magnetic field will be generated between the rotor and the stator. The control circuit then drives the electric fan motor into operation. Therefore, in the conventional fan motor design, as long as the fan rotor, the motor stator, and the drive circuit work together via the pivot joint between the shaft core and the bearings and through magnetic field induction, the motor can operate effectively.

When it comes to cooling fans, people know there are many types, each with numerous models, and different models come with varying specifications. To choose the right fan for your needs, you’ll need to have a solid understanding of these options. Do you know what common types of cooling fans there are, and are you familiar with their characteristics? Here are some of the most common types of cooling fans: Axial-flow fans—As the name suggests, the blades of an axial-flow fan propel air in the same direction as the shaft. The impeller of an axial-flow fan is somewhat similar to that of a propeller. During operation, most of the airflow runs parallel to the shaft—that is, along the axial direction. When the inlet airflow of an axial-flow fan is free air with zero static pressure, its power consumption is at its lowest; as backpressure in the airflow increases, so does the power consumption. Axial-flow fans are typically mounted on the enclosures of electrical equipment and sometimes integrated directly into motors. Thanks to their compact design, axial-flow fans save considerable space, are easy to install, and find wide application. Characteristics of axial-flow fans: They offer high airflow but operate at medium pressure. Centrifugal fans, on the other hand, work by having their blades push air perpendicular to the shaft (i.e., radially). Air enters along the axial direction and exits perpendicular to the shaft. In most cases, using an axial-flow fan can achieve the desired cooling effect; however, if you need a 90-degree airflow rotation or higher air pressure, you’ll have to opt for a centrifugal fan instead. Strictly speaking, a fan can also be classified as a centrifugal fan. Characteristics of centrifugal fans: They provide limited airflow. High-pressure mixed-flow fans, also known as diagonal-flow fans, may look similar to axial-flow fans at first glance. In fact, while the inlet of a mixed-flow fan is aligned along the axis, its outlet is directed diagonally—not only along the axis but also perpendicular to it. Because the blades and outer casing are shaped like a cone, these fans generate relatively high air pressure. Under the same size and comparable performance conditions, centrifugal fans tend to produce less noise than axial-flow fans. Characteristics of mixed-flow fans: They deliver high airflow and relatively high air pressure. Cross-flow fans can generate large-area airflow and are commonly used to cool large surfaces of equipment. The inlet and outlet of this type of fan are both perpendicular to the shaft. Cross-flow fans employ long, bucket-shaped impellers. The diameter of the bucket-shaped blades is relatively large. Due to their larger diameter, these fans can operate at relatively lower speeds while still ensuring efficient overall air circulation, thus reducing noise caused by high-speed operation. Cross-flow fans can generate large-area airflow and are commonly used to cool large surfaces of equipment. The inlet and outlet of this type of fan are both perpendicular to the shaft. Cross-flow fans employ long, bucket-shaped impellers. The diameter of the bucket-shaped blades is relatively large. Due to their larger diameter, these fans can operate at relatively lower speeds while still ensuring efficient overall air circulation, thus reducing noise caused by high-speed operation. Mixed-flow fans are characterized by low airflow and low air pressure. China offers various types of axial-flow fans, centrifugal fans, and mixed-flow fans. Among them, Jiangshan Lai Technology’s DC fans belong to the category of axial-flow fans. Within this type, you can choose from several different models. Our cooling fans are widely used in industries such as telecommunications equipment, LED stage lighting, medical devices, aerospace, and more.

For many years, automotive engine cooling has relied on brushed fans, which use a brush motor to drive fan blades at high speeds to dissipate heat from the radiator. Initially, brushless fans were pioneered by major international companies such as Bosch and BOSCH. However, in recent years, brushless fans have begun to gain popularity in China and have become a highly sought-after and widely recognized technological product. The core component of a brushless fan is the brushless motor. Compared with traditional brushed motors, brushless motors offer advantages such as compact size, high efficiency, and long service life. 1. Compact Size Through optimized design and careful selection of copper wire, we’ve increased slot fill factor, enhanced heat dissipation, improved motor efficiency, and reduced overall motor volume. Let’s compare a 200W brushed motor with its brushless counterpart. When the outer diameter remains constant, the motor height is reduced from 88.2mm to 68.5mm, making it more space-efficient for vehicle integration. Currently, the thinnest 400W brushless motor developed can be as thin as 63mm. 2. High Efficiency The motor is the component that consumes the most power in an entire electromechanical system; thus, improving its efficiency is especially critical. For a single motor, the efficiency of a brushed motor is around 65%, whereas our 400W brushless motor achieves an efficiency of up to 85%. This means the brushless motor’s efficiency is 20% higher than that of a brushed motor. 3. Long Service Life Brushless fan motors eliminate friction between carbon brushes and commutators. The only parts subject to wear are the bearings, significantly extending the motor’s lifespan. Under comprehensive operating conditions, the motor’s service life can reach 30,000 hours—about three times longer than that of a brushed motor. Note: We use back-EMF detection rather than Hall sensors to determine the rotor position. Advantages of Brushless Fans: • Smooth motor startup: The starting current gradually increases, avoiding large inrush currents that could blow fuses or cause voltage drops in the power supply. • Stepless speed control with a wide adjustment range (currently, fan speeds can be controlled between 600 and 3,000 RPM) and strong overload capacity. In contrast, brushed motors rely on resistor-based speed control, which is less efficient. Using a brushed + PWM speed-control module combination results in lower overall cost competitiveness compared to brushless solutions. • The motor itself has no excitation losses or brush losses, resulting in high efficiency and excellent overall energy savings—up to 15% savings—and a service life of 30,000 hours under typical operating conditions. • Utilizing PWM communication, the motor features multiple protection functions—including stall protection, overcurrent protection, overvoltage protection, and undervoltage protection—as well as fault feedback capabilities. It can also support LIN communication to meet various customer requirements. • Lightweight design: By selecting more efficient and lightweight materials and simplifying the structural design, we’ve achieved lighter weight. For example, the spherical design with concave-convex structures used in brushless fans ensures that even the lightest 400W fan assembly weighs only 3 kg. • No carbon brushes, no sparking, and an integrated motor-controller structure result in better EMC performance, with conducted and radiated emissions reaching Level 3 compliance. • From chip mounting to stator and rotor production, all components are manufactured in-house, ensuring complete process capabilities. Our services cover everything from product architecture design and electromagnetic design to structural and performance simulations, vibration analysis, strength analysis, product validation, testing, EMC testing, noise testing, and airflow testing. We can perform LIN programming for brushless fans and quickly customize development according to customer specifications, providing customers with complete turnkey solutions.

Cooling fans typically refer to categories such as cooling fans, DC fans, AC fans, boosted cooling fans, and blowers. These devices utilize airflow to dissipate the heat generated by household appliances, ensuring the proper functioning of equipment. The cooling fan bearing is the core transmission component of the cooling fan; it supports and secures the rotor of the fan motor, enabling the fan to rotate at high speeds. Therefore, the quality of the cooling fan bearing largely determines the overall quality and service life of the cooling fan. Consequently, micro-bearings used in cooling fans usually must possess the following attributes and characteristics. Popular models of cooling fan bearings include: MR52Z2*5*2.5. 682Z2*5*2.3. MR83Z3*8*3. 693Z3*8*4. 684Z4*9*4. Standard cooling fan bearings must have the following features: 1: High precision and stability—precise dimensional tolerances for cooling fan bearings ensure perfect fit and compatibility with all related components. 2: High speed and flexible rotation—cooling fans require high-speed bearings, so the bearings serving as transmission components must be high-speed bearings themselves. 3: Low noise—since cooling fans are commonly used in computers and other small indoor household appliances, they must operate with sufficiently low noise levels. The magnitude of noise depends entirely on the noise generated by the cooling fan’s bearing, which serves as the core transmission component; thus, the cooling fan bearing must produce very low noise. 4: Low friction—through complete manufacturing processes and appropriate lubrication, cooling fan bearings minimize friction and resistance during operation, ensuring trouble-free performance. 5: Long service life—most cooling fans operate for extended periods, so their bearings must have a sufficiently long service life, typically around 40,000 hours, to guarantee the longevity of the cooling fan. 6: Environmentally friendly. Our company adheres to a customer-first philosophy, driven by high technology and grounded in quality. We earn our customers’ trust through integrity and provide them with high-quality, highly reliable cooling fans and system cooling solutions. Excellence and outstanding performance are our corporate spirit. Promoting industry development and growing together with our employees is our corporate mission. All colleagues will keep striving tirelessly and working collectively toward a shared vision! Let’s create brilliance together and welcome a bright tomorrow!

A blower is a type of general-purpose machinery used for conveying gases. From an energy perspective, it is a machine that converts the mechanical energy of a prime mover into the energy of a gas, and it is primarily used as a gas power source for gas transportation. From the standpoint of application fields, blowers can also be employed in gas combustion, metal oxidation, desulfurization oxidation, fermentation, wastewater treatment, and other processes. Blower classifications include: positive-displacement types—Roots blowers and screw blowers; multistage centrifugal blowers (low-speed); and single-stage centrifugal blowers (high-speed).

First, it’s important to explain the operating principle of cooling fans. Many people assume that radiator fans are designed to cool the coolant tank before the coolant itself is cooled—otherwise, the fans wouldn’t be positioned behind or in the middle of the tank. However, this understanding is absolutely incorrect, as it stems from a basic common-sense misconception. During driving, a car must overcome aerodynamic drag, and air, under the influence of gravity, flows without dead spots. Consequently, as the car moves forward, it has to push air aside, which results in a loss of power at the wheels—this loss can be defined as driving resistance.

Compared to AC motors, the greatest advantage of DC motors is their wide adjustable speed range. When operating at low speeds, these fans produce minimal noise and boast high energy efficiency. Therefore, with a dual-layer fan blade design, the fan can deliver a gentle, natural breeze that won’t cause headaches even after prolonged use.