High-overload-resistant double-stator-rotor series ultrasonic motor and implementation mode

Abstract

The invention relates to a high-overload-resistant double-stator-rotor series ultrasonic motor and an implementation mode. The ultrasonic motor comprises a middle shell, the center of the middle shell is taken as a central point, and the middle shell is divided into two symmetrical parts by a symmetrical section penetrating through the central point along the radial direction of the middle shell; a rotor assembly and a stator assembly are arranged in each part in a sleeving manner, and the rotor assemblies of the two parts are arranged in series close to the symmetric section; stator seats are installed at the ends of the middle shell respectively, stator supporting frames and first buffer rubber rings are distributed on the surfaces of the stator seats, protruding cylinders are arranged in the centers of the stator seats, the protruding cylinders are sleeved with the stator supporting frames, the first buffer rubber rings and the stator supporting frames are coaxially arranged, and disc springs are distributed between the stator seats and the stator supporting frames. The stator assembly sleeves the stator support frame, and the tooth surface of the stator assembly sleeves the rotor assembly; the stator and the rotor can bear high overload impact in the positive and negative axial directions, and meanwhile, the high overload resistance is achieved.

Description

technical field [0001] The invention relates to a high-overload-resistant dual-stator-rotor series ultrasonic motor and its implementation, belonging to the technical field of ultrasonic motors. Background technique [0002] Various rotary traveling wave ultrasonic motors in the prior art, whether it is a single stator-rotor structure or a double-stator-single-rotor, double-stator-double-rotor structure, usually use screws to connect the shell to the base. The upper bearing is directly pressed on the shoulder of the rotor or on the shoulder of the shaft connected to the rotor to realize the application of preload, and the preload can be adjusted by changing the thickness of the adjusting gasket on the bearing and the shoulder. In order to improve the output performance of the ultrasonic motor, the stator elastic body and the rotor of the ultrasonic motor are usually designed as a flexible structure. The stator elastic body and the rotor have flexible webs. Because the stator...

AI Technical Summary

Problems solved by technology

However, when the impact force is in the direction of the rotor, since the flexible rotor has no protective measures, when the impact force is concentrated on the flexible rotor, the flexible rotor may yield and fail

Therefore, under this technical scheme, the high overload resistance of the entire motor depends on the overload resistance of the flexible rotor; in addition, it is worth noting that in this technical scheme, the wave spring is directly in contact with the stator elastic body (pressed on the flexible rotor). Conductive film), acting on the stator elastic vibration substrate, whether the force of the wave spring directly or indirectly acts on the stator elastic vibration substrate, will affect the output performance of the motor to a certain extent

[0004] Similarly, the patent No. CN201822194084.3 also proposes an anti-overload method, but it is just the opposite of the anti-overload method mentioned in the patent No. CN201610138371.5. It protects the rotor very well, but However, it fails to protect the stator elastic body well; it arranges a disc spring between the rotor and the pre-pressure plate, and uses the zero-stiffness characteristic of the disc spring to achieve a large axial displacement to maintain the pre-compression between the stator and rotor. To ensure the output performance of the motor, this structure can release the impact force for the rotor to protect the rotor when the impact force is in the direction of the rotor; but when the impact force is in the direction of the stator elastic body, since the stator elastic body has no protection measures , when the impact force is concentrated on the stator elastic body, there is a possibility of yield failure of the stator elastic body

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