Among the operating parts of hydrogen fuel cell stacks and air compressors, the rotor is the key to the power source, and its various indicators are directly related to the efficiency and stability of the machine during operation.
1. Rotor requirements
Speed requirements
The speed needs to be ≥100,000RPM. The high speed is to meet the gas flow and pressure requirements of hydrogen fuel cell stacks and air compressors during operation. In hydrogen fuel cells, the air compressor needs to quickly compress a large amount of air and deliver it to the cathode of the stack. The high-speed rotor can force the air to enter the reaction area with sufficient flow and pressure to ensure the efficient reaction of the fuel cell. Such a high speed has strict standards for the material strength, manufacturing process and dynamic balance of the rotor, because when rotating at high speed, the rotor has to withstand huge centrifugal force, and any slight imbalance may cause severe vibration or even component damage.
Dynamic balance requirements
The dynamic balance needs to reach the G2.5 level. During high-speed rotation, the mass distribution of the rotor must be as uniform as possible. If the dynamic balance is not good, the rotor will generate tilted centrifugal force, which will not only cause vibration and noise of the equipment, but also increase the wear of components such as bearings, and reduce the service life of the equipment. Dynamic balancing to G2.5 level means that the rotor imbalance will be controlled within a very low range to ensure the stability of the rotor during rotation.
Magnetic field consistency requirements
The requirement of magnetic field consistency within 1% is mainly for rotors with magnet. In the motor system related to hydrogen fuel cell stacks, the uniformity and stability of the magnetic field have a decisive influence on the performance of the motor. Accurate magnetic field consistency can ensure the smoothness of the motor output torque and reduce torque fluctuations, thereby improving the energy conversion efficiency and operation stability of the entire stack system. If the magnetic field consistency deviation is too large, it will cause problems such as joggle and heating during motor operation, seriously affecting the normal operation of the system.
Material requirements
The rotor magnetic material is SmCo, a rare earth permanent magnet material with the advantages of high magnetic energy product, high coercive force and good temperature stability. In the working environment of the hydrogen fuel cell stack, it can provide a stable magnetic field and resist the influence of temperature changes on the magnetic field strength to a certain extent. The sheath material is GH4169 (inconel718), which is a high-performance nickel-based alloy. It has excellent high temperature strength, fatigue resistance and corrosion resistance. It can effectively protect the magnet in the complex chemical environment and high temperature working conditions of hydrogen fuel cells, prevent it from corrosion and mechanical damage, and ensure the long-term stable operation of the rotor.
2. The role of the rotor
The rotor is one of the core components of the machine operation. It drives the impeller to inhale and compress the outside air through high-speed rotation, realizes the conversion between electrical energy and mechanical energy, and provides sufficient oxygen for the cathode of the stack. Oxygen is an important reactant in the electrochemical reaction of fuel cells. Sufficient oxygen supply can increase the rate of electrochemical reaction, thereby increasing the power generation of the stack and ensuring the smooth progress of energy conversion and power output of the entire hydrogen fuel stack system.
3. Strict control of production and quality inspection
Hangzhou Magnet Power has advanced technology and processes in rotor production.
It has rich experience and technical accumulation in the control of the composition and microstructure of SmCo magnets. It is capable of preparing ultra-high temperature SmCo magnets with a temperature resistance of 550℃, magnets with a magnetic field consistency within 1%, and anti-eddy current magnets to ensure that the performance of the magnets is maximized.
In the processing and manufacturing process of the rotor, high-precision CNC processing equipment is used to accurately control the dimensional accuracy of the magnets and the dimensional accuracy of the rotor, ensuring the dynamic balance performance and magnetic field consistency requirements of the rotor. In addition, in the welding and forming process of the sleeve, advanced welding technology and heat treatment process are used to ensure the close combination of the GH4169 sleeve and the magnet and the mechanical properties of the sleeve.
In terms of quality, the company has a complete and precise set of testing equipment and processes, using various measuring equipment such as CMM to ensure the shape and position tolerance of the rotor. The Laser speedometer is used for the speed detection of the rotor to accurately capture the speed data of the rotor when it rotates at high speed, providing the system with reliable speed data guarantee.
Dynamic balancing detection machine: The rotor is placed on the detection machine, and the vibration signal of the rotor is collected in real time through the sensor during rotation. Then, these signals are deeply processed by the data analysis system to calculate the rotor’s imbalance and phase information. Its detection accuracy can reach G2.5 or even G1. The detection resolution of the imbalance can be accurate to the milligram level. Once the rotor is detected to be unbalanced, it can be accurately corrected based on the detection data to ensure that the dynamic balance performance of the rotor reaches the best state.
Magnetic field measuring instrument: It can comprehensively detect the magnetic field strength, magnetic field distribution and magnetic field consistency of the rotor. The measuring instrument can perform multi-point sampling at different positions of the rotor, and calculate the magnetic field consistency deviation value by comparing the magnetic field data of each point to ensure that it is controlled within 1%.
The company not only has an experienced and skilled production team, but also has a research and development team that can continuously optimize and innovate the design and manufacturing process of the rotor to meet the needs of the ever-changing market. Secondly, Hangzhou Magnet Power Technology Co., Ltd. can provide customers with exclusive customized rotor solutions based on different user scenarios and needs, combined with years of industry experience, strict control of raw materials, technological innovation and development, and quality inspection to ensure that every rotor delivered to customers is a high-quality product.
Post time: Dec-04-2024
