Combination key for connecting rotor bracket and rotor core

Abstract

The invention relates to a combination key for rotor support and rotor iron core connection. A primary key groove for placing a major key and subsidiary keys is a composite keyway structure; gaps between the major key and the subsidiary keys, and gaps between the subsidiary keys and a rotor punching sheet can effectively isolate radial interference and tangential interference. The major key is rectangular, and is lower than the notch of the primary key groove; the groove bottom of the major key is provided with a rectangular secondary groove. Rectangular bulges are projected from the inner circle of the rotor punching sheet, and are slightly wider than a rectangular bulge of the major key, thereby guaranteeing contact between the rectangular bulges and the subsidiary keys in a radial direction through a interference fit mode, meanwhile guaranteeing a gap between the major key and the subsidiary keys in a tangential direction, and reducing rotor punching sheet groove bottom circular bead stress concentration and yoke part magnetic field density and loss. The subsidiary keys are sectional type combination sparring taper key structures to increase a contact area in a rotor iron core axial direction; the major key and the subsidiary keys are respectively responsible for radial direction and tangential interference. The combination key is suitable for a large torque motor, especially a three generation nuclear power station circulating water pump motor, and can be used for the industries of nuclear power, metallurgy, seawater desalination, etc.

Description

technical field [0001] The invention relates to a combined key for connecting a rotor support and a rotor core. Background technique [0002] When a large motor has many poles, a large electromagnetic torque is often generated between the stator and the rotor, and the output mechanical torque of the motor rotor is approximately equal to the electromagnetic torque; therefore, the motor rotor system must bear a large mechanical torque, and the motor rotor The mechanical torque transmission of the system is mainly composed of the rotor bracket and the rotor core, and a combination key is set between the two, that is, the torque transmission is reliable in the radial and tangential directions, and the interference between the two must be Strict requirements make the contact between the rotor core and the rotor bracket adopt an interference fit, and suppress the phenomenon of excessive rotor vibration caused by insufficient interference between the two, so as to improve the relia...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a combination key for connecting the rotor support and the rotor core, which solves the problem of unstable interference in the locking structure of the combination key in the past

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