Vibration motor

Abstract

The invention discloses a vibration motor. The vibration motor comprises a housing, and further comprises a gear switch used for controlling the frequency of an alternating-current power supply, and an elastic insertion piece, wherein an output shaft is rotationally arranged in the housing; two opposite coils are arranged on a side wall of the housing; an armature part in response to the coils is fixedly arranged on the output shaft; a slot is formed in the bottom of the output shaft; an insertion slot allowing the elastic insertion piece to insert is formed in a bottom end of the slot; a drive mechanism pushing the elastic insertion piece is arranged at one end of the elastic insertion piece. Compared with the prior art, the slot allowing the elastic insertion piece to insert is formed in the bottom of the output shaft and the drive mechanism pushing a spring leaf is arranged, so that when the gear switch performs switching among gears at different vibration frequencies, the spring leaf is inserted into the slot of the output shaft through the drive mechanism to change an elastic deformation coefficient of the spring leaf, and the coil output frequency can be guaranteed to be the same as the frequency of the output shaft of the vibration motor when a maintenance tool is switched among the gears at different frequencies.

Description

technical field [0001] The invention belongs to the field of motors, and more specifically relates to a vibration motor. Background technique [0002] Vibration motors are motors commonly used in personal care appliances, such as electric toothbrushes, electric face washers, etc., all have vibration motors inside, and the output shaft of the vibration motor is connected to the brush head to transfer the vibration of the output shaft of the vibration motor to the brush head. site transfer. The vibration motor of the existing vibration motor includes a housing, in which there are two oppositely placed coils, an AC power supply is passed through the coils, and a gear switch for controlling the frequency of the AC power supply is also included. The output shaft is rotatably arranged inside the housing, and armatures are arranged at both ends of the output shaft, and the armature responds to the change of the magnetic field in the coil so that the output shaft moves along the sh...

AI Technical Summary

Problems solved by technology

At this time, a contradiction arises: that is, because the natural frequency of the output shaft of the existing personal care appliance vibration motor is fixed at the time of design (determined by the hardness and quality of the output shaft material), the output of the coil The frequency is adjusted at any time according to the needs of the user. When switching between different gears, it is difficult to make the output frequency of the coil consistent with the natural frequency of the output shaft. At this time, the vibration will not be fully transmitted to the required parts.

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