High Speed Single Phase AC Electric motor have wide application prospects in the following fields:
(1) high speed motors have been applied in many fields, such as air conditioners or refrigerators, centrifugal compressors, etc. with the development of science and technology, more and more special requirements are demanded, and their applications will be more and more extensive.
(2) with the development of automobile industry, hybrid electric vehicle has the advantages of small volume, light weight high speed generator will receive sufficient attention, and aviation in hybrid vehicles, and has good application prospects in areas such as ship.
(3) high speed generator is driven by a small volume of gas turbine, with high flexibility, can be used for standby power supply some important facilities, also can be used as an independent power supply or small power station, to make up for lack of centralized power supply, it has important practical value.
Due to the centrifugal force and the line speed of high speed motor rotor is proportional to the square of the high-speed motor, with high mechanical strength and high speed motor; because of the high frequency, large iron loss, it should be appropriate to reduce the core magnetic flux density, the core material of low loss.
Bearing research is also inseparable from the high-speed motor, because ordinary bearings are difficult to bear, in the high-speed system to withstand long time operation, we must adopt new materials and new structure of bearings.
High speed motor can have many kinds of structure, such as induction motor, permanent magnet motor and reluctance motor, etc.. When the speed of the motor is above 200m/s, the conventional laminated rotor can not bear the centrifugal force generated by the high-speed rotation, and the special high strength lamination or solid rotor must be used.
In the past hundred years of development of rotor dynamics, there have been many computational methods. Today, the modern methods of computation can be divided into two major types: the transfer matrix method and the finite element method.
The equation of motion of the finite element method is concise and standard. It has many advantages in solving the problem of rotor dynamics or the complex mechanical system composed of rotor and surrounding structure. The finite element method (FEM) has a large division of complex rotor system, and the calculation results are more accurate than the transfer matrix method. However, the computation time is long and the memory is large. The development of modern computer technology provides a good hardware technology for the finite element method.