Rotor structure for center ladder hole

Abstract

The invention discloses a rotor structure for a center ladder hole. The rotor structure comprises a mandrel, a rotor silicon steel sheet and magnet steel, wherein the mandrel comprises a shaft head part, a middle shaft part and a shaft tail part which are molded integrally and arranged coaxially; the mandrel is provided with a shaft hole passing through the shaft head part, the middle shaft part and the shaft tail part along an axle center direction; the shaft hole comprises a first hole part, a second hole part and a third hole part; the second hole part is positioned in the center of the middle shaft part; the first hole part and the third hole part are symmetrically positioned on two sides of the second hole part; the first hole part extends into the middle shaft part from the shaft head part; and the third hole part extends into the middle shaft part from the shaft tail part. According to the rotor structure, different shaft segments of a rotor assembly are reduced in weight reasonably, so that the aim of increasing the inherent frequency of the rotor assembly is fulfilled.

Description

Technical field: [0001] The invention relates to a rotor structure with a central stepped hole. Background technique: [0002] When designing the magnetic levitation motor rotor, it is necessary to avoid designing the working speed near its natural frequency to prevent resonance. With the development of the motor, its power and operating speed continue to increase. In order to increase the natural frequency of the rotor, there are usually two design directions: [0003] 1) The rotor is designed as a flexible shaft, and the working speed exceeds the first-order frequency, which is located between a certain two-order natural frequency, but the structure is complex and large; [0004] 2) It is still designed as a rigid shaft, and its speed is still lower than the first-order frequency, but at this time the structure of the rotor system needs to be adjusted. [0005] The natural frequency of the rotor is directly related to the stiffness of the bearing, its own mass distributi...

AI Technical Summary

Problems solved by technology

[0005] The natural frequency of the rotor is directly related to the stiffness of the bearing, its own mass distribution, and the structural size. Once the overall size of the rotor is basically determined, if the natural frequency is increased by adjusting the structural size, the effect will be limited.

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