Maglev Centrifugal Blower

The magnetic levitation blower is a type of mechanical equipment used for transporting gas. It utilizes core technologies such as magnetic levitation bearings, a three-dimensional impeller, a high-speed permanent magnet synchronous motor, efficient frequency conversion speed control, and intelligent monitoring and control. During startup, it first levitates and then rotates, operating without friction and without the need for lubrication. The three-dimensional impeller is directly connected to the rotor, resulting in zero transmission loss. It is a high-tech, eco-friendly, energy-saving product.

The main components include a high-efficiency centrifugal impeller, magnetic levitation bearing, permanent magnet synchronous motor, and dedicated frequency converter. This type of fan adopts an integrated design, with its high-speed motor, frequency converter, magnetic levitation bearing, and microprocessor control panel all designed and integrated as one unit. Its core lies in the magnetic levitation bearing and permanent magnet motor technology. 

The magnetic levitation blower is directly driven by a high-speed motor and its speed is controlled by a frequency converter. Using an active magnetic levitation bearing system, it provides contactless and wear-free suspension support to the internal rotating magnetic levitation bearing through controllable electromagnetic forces. The magnetic levitation bearing is directly connected to the impeller, resulting in zero transmission loss. This allows successful gas delivery while the machine experiences no internal wear, low noise, and requires no lubrication. [1]

The function of the magnetic levitation bearing is to achieve shaft suspension. It uses built-in position sensors to detect the position signals of the shaft and sends these signals to the magnetic levitation bearing controller for processing, computation, and amplification to obtain a control current. This control current is then applied to the magnetic bearing to generate a controllable attractive force on the rotor, thereby achieving shaft suspension.

The function of the synchronous permanent magnet motor is to drive the rotation of the rotor shaft. It generates an adjustable frequency alternating current through a variable frequency power source, which, when applied to the motor stator, produces a rotating magnetic field that drives the rotor to spin at high speeds.

The function of the blower is to produce airflow. The impeller, rotating at high speed with the shaft, draws air into the volute through the inlet. The air is guided and pressurized by the volute, resulting in gas with a certain velocity and pressure, which is finally expelled through the volute outlet, thereby achieving the blower’s airflow.

(1) High-speed centrifugal impeller: The impeller is designed based on ternary flow theory with optimized parameters to maximize its efficiency and broaden the operating range. It is made of high-strength forged aluminum or titanium alloy, offering strong deformation resistance. Precision machining is done via a CNC machining center, providing better corrosion resistance. According to measurements by experts at the National Fluid Laboratory, the impeller can achieve a maximum working efficiency of 85%.

(2) High-speed permanent magnet synchronous motor: Permanent magnets are installed on the motor's main shaft to ensure shaft magnetism. The motor's stator is wound with silicon steel sheet coils that generate oscillating magnetic force. During operation, the rotational speed and oscillating magnetic field remain synchronized, achieving synchronous conduction. The permanent magnet motor uses a magnetic levitation bearing, featuring no mechanical friction, low noise, low vibration, and long lifespan, with a maximum speed of 50,000 rpm.

(3) Magnetic levitation bearing: The shaft is stably levitated through controllable electromagnetic attraction. During rotation, the shaft experiences no mechanical resistance, resulting in high efficiency, no wear, maintenance-free operation, and no need for lubrication, ensuring that the discharged air is completely oil-free.

(4) Motor intelligent control system: Magnetic levitation blowers generally use vectorless frequency control, where motor rotation is regulated by adjusting the frequency, which in turn controls the blower's airflow to meet various operational needs. The intelligent control system can predict surge and enable local control. Additionally, with the installed GPRS system, remote monitoring and data transmission are possible.

1. High-Efficiency Impeller
   The high-efficiency impeller features a three-dimensional flow design, and five-axis machining technology ensures precise manufacturing.
   2. Magnetic Levitation Bearings
   No mechanical wear, low energy consumption, and semi-permanent lifespan.
   3. Integrated Structural Design
   The fan impeller is directly mounted on the motor shaft, integrated with the control system, and housed within the unit, making the structure simple and compact.
   4. Easy Installation and Maintenance
   No lifting equipment or high spaces are required, no special foundation is needed, maintenance is convenient, and it also saves on the construction cost of the machine room.
   5. Modular System Design
   Multiple blowers can work in parallel according to different user flow requirements, providing a wide adjustment range and high flexibility.