Highly-efficient composite cage bar motor rotor and preparation method thereof

Abstract

The invention provides a highly-efficient composite cage bar motor rotor. The highly-efficient composite cage bar motor rotor comprises a rotor, and is characterized in that the rotor comprises a set of rotor punching sheets, inner and outer squirrel cage slots are formed in the rotor punching sheets; inner squirrel cage bars are inserted in the inner squirrel cage slots; a silicon aluminum outer squirrel cage which comprises outer squirrel cage bars and an end ring is cast in the outer squirrel cage slots once; the end ring comprises blades and balance columns; two ends of each of the inner squirrel cage bars and the outer squirrel cage bars are connected with the end ring integrally. The highly-efficient composite cage bar motor rotor disclosed by the invention is reasonable and simple in structure, scientific and advanced; when the highly-efficient motor rotor of high-speed pressed copper-aluminum double-squirrel cage composite cage bars is started, the starting current is concentrated on the outer squirrel cage due to a skin effect, equivalently, an effective section is small, the effective resistance is large, and power factors are increased, so that the starting current of a motor is reduced, and the starting torque is increased.

Description

technical field [0001] The invention relates to a high-efficiency composite cage motor rotor and a preparation method thereof, more specifically relates to a high-efficiency high-speed pressed copper-aluminum double squirrel cage composite cage motor rotor, which belongs to the technical field of electric motors. Background technique [0002] Implement the motor energy efficiency improvement plan to promote the upgrading of the motor industry. AC asynchronous motors are commonly used in electrical machinery, and usually adopt a squirrel-cage rotor structure. The main disadvantage is that the starting characteristics are poor, and the efficiency improvement is limited under the condition of volume limitation. In order to meet the energy efficiency requirements of IE4 in the small and medium power range, the volume of the stator and rotor must be increased, the materials will be increased, and the versatility of parts will be poor. [0003] Using the copper casting process, t...

AI Technical Summary

Problems solved by technology

AC asynchronous motors are commonly used in electric machinery, and usually adopt a squirrel-cage rotor structure. The main disadvantage is that the starting characteristics are poor, and the efficiency improvement is limited under the condition of volume limitation.

In order to meet the energy efficiency requirements of IE4 in the small and medium power range, the volume of the stator and rotor must be increased, the materials will increase, and the versatility of parts will be poor.

[0003] Using the copper casting process, the biggest challenge of the copper casting rotor is the casting process problem, because the melting point of aluminum is 670°C, while the melting point of copper is as high as 1083°C, such a high temperature will have a great impact on the insulation coating of the mold and cold-rolled silicon steel sheet Due to the high cost of casting molds and short service life, it is impossible to achieve the pass rate of casting molds like aluminum, resulting in too high overall cost of the rotor, so it is difficult to popularize and apply at present.

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