However, both at home and abroad, the design and analysis of high-speed motor still need to be solved.Specifically, we need to know the following problems in the design and analysis of the purchase of high-speed motor.
First, it is not mature to analyze high-speed motor based on the coupling method of multiple physical fields such as electromagnetic field, stress field, rotor dynamics, fluid field and temperature field.
Second, high-speed bearings are faced with big problems, such as ball bearings can not bear high speed, air bearings bearing capacity is limited, magnetic suspension bearings control complex and expensive.
Thirdly, the rotor dynamic design technology of high power and high speed motor is not yet perfect, and the research and development of transformation system, control system and real-time monitoring system is relatively weak.
Fourth, the cooling structure of the high-power rate high-speed permanent magnet motor is complex, and the cooling effect is limited due to the combination of air cooling and water cooling.
Fifth, the development of high-speed permanent magnet motor towards ultra-high speed and high power is restricted by the low tensile strength and poor temperature resistance of permanent magnet.
Sixth, the alloy protective sleeve of the face-mounted permanent magnet motor has a large eddy current loss, and the thermal conductivity of the carbon fiber protective sleeve is poor, which is not conducive to the heat dissipation of its rotor.
Seventh, the conventional laminated rotor cannot bear the larger centrifugal force, and the solid rotor has the larger eddy current loss
