In recent years, high-speed motors have developed rapidly (speed ≥ 10000RPM). As carbon reduction targets are recognized by various countries, high-speed motors have been rapidly applied due to their huge energy-saving advantages. They have become the core driving components in the fields of compressors, blowers, vacuum pumps, etc. The core components of high-speed motors are mainly: bearings, rotors, stators, and controllers. As an important power component of the motor, the rotor plays a core role. They are widely used in various machines and equipment with their excellent performance and excellent quality. While bringing efficient production to enterprises, they are also changing people’s lives. At present, the high-speed motors that are widely used on the market are mainly: magnetic bearing motors, air bearing motors and oil sliding bearing motors.
Next, let’s take a closer look at the characteristics of the rotor in different usage scenarios:
1. Magnetic bearing motor
The rotor of the magnetic bearing motor is suspended in the stator through the electromagnetic force generated by the magnetic bearing, avoiding the contact friction of traditional mechanical bearings. This makes the motor almost free of mechanical wear during operation, reduces maintenance costs, and can achieve high-speed operation. Through sensors and control systems, the position accuracy of the rotor can be controlled at the micron level. Because active magnetic bearings are generally used, magnetic bearing motors have obvious advantages in the high-power range of 200kW-2MW. Taking the magnetic bearing refrigeration compressor as an example, due to the existence of mechanical friction, traditional compressors not only have high energy consumption, but also high noise and relatively limited life. The application of magnetic bearing refrigeration compressors perfectly solves these problems. It can compress refrigerant in a more efficient way, greatly improve the energy efficiency of the refrigeration system, and reduce the power consumption of household and commercial refrigeration equipment (saving electric energy 30%). At the same time, low-noise operation also creates a quieter and more comfortable environment for users, whether in home air conditioners or large commercial cold storages, it can bring a good user experience. Well-known companies such as Midea, Gree, and Haier are using this technology.
2. Air bearing motor
The rotor of the air bearing motor is suspended through air bearings. During the start-up and operation of the motor, the air bearing around the rotor uses the air pressure generated by high-speed rotation to suspend the rotor, thereby reducing the friction between the rotor and the stator and reducing the loss. The rotor of the air bearing motor can run stably at a higher speed. In the small power range of 7.5kW-500kW, the air bearing motor has advantages because of its small size and high speed. Because the friction coefficient of the air bearing decreases with the increase of the speed, the efficiency of the motor can still be maintained at a high level at high speed. This makes air bearing
motors widely used in some ventilation or gas compression systems that require high speed and large flow, such as industrial waste gas treatment equipment, aeration blowers for sewage tanks, compressors for hydrogen fuel cell systems, etc. The working medium of the air bearingmotor is air, which does not have the risk of oil leakage like oil-lubricated bearings, and does not cause oil pollution to the working environment. This is very friendly in industries with high requirements for the production environment, such as food processing, medical supplies and other fields.
3. Sliding bearing motor
In the sliding bearing motor, the use of sliding bearings allows the rotor to rotate at high speed with high power (always ≥500kW). The rotor is also the core rotating component of the motor, which generates a rotational torque through interaction with the stator magnetic field to drive the load to work. The main advantages are stable operation and durability. For example, in the motor of a large industrial pump, the rotation of the rotor drives the pump shaft, allowing the liquid to be transported. The rotor rotates in a sliding bearing, which provides support for the rotor and bears the radial and axial forces of the rotor. When the rotor speed and load are within the specified range, the rotor rotates smoothly in the bearing, which can reduce vibration and noise. For example, in some industrial production processes that require high operating stability, such as papermaking, textiles and other industries, sliding bearing motors can ensure production continuity and product quality.
4. Summary
The application and development of high-speed motor rotors have brought opportunities and changes to many industries. Whether it is magnetic bearing motors, air bearing motors or sliding bearing motors, they all play a key role in their respective application fields and solve many problems faced by traditional motors.
Hangzhou Magnet Power Technology Co., Ltd. has not only mastered more than 20 patented technologies through investment in R&D, production control of product quality and a perfect after-sales service system, but also provides more stable and reliable magnetic component products for many domestic and foreign partners. Hangzhou Magnet Power Technology Co., Ltd. can produce both solid rotors and laminated rotors for high speed motors. For the magnetic field consistency, welding strength, and dynamic balance control of solid rotors, Magnet Power has rich production experience and a perfect testing system. For laminated rotors, Magnet Power has excellent anti-eddy current characteristics, ultra-high strength and good dynamic balance control. In the future, the company will continue to invest in R&D, and continuously improve production technology and processes. Magnet Power is committed to providing high-performance and high-quality magnetic products to every customer, gather magnets power to create a more efficient world.
Post time: Dec-07-2024
