Built-in linear bearing eccentric-resistant structure for voice coil motor

Abstract

The invention belongs to a voice coil motor designing technology, and relates to a built-in linear bearing eccentric-resistant structure for a voice coil motor. The built-in linear bearing eccentric-resistant structure for the voice coil motor comprises a voice coil motor rotor, a voice coil motor stator, a sensor stator, a sensor movable core and a linear bearing, wherein the sensor stator is fixed on the voice coil motor stator; the sensor movable core is connected with the voice coil motor rotor; the linear bearing is positioned between the sensor stator and the voice coil motor rotor; and when the voice coil motor rotor moves, the voice coil motor rotor can be prevented from being eccentric relative to the voice coil motor stator by the linear bearing, and the sensor movable core can also be prevented from being eccentric relative to the sensor stator by the linear bearing. When the voice coil motor which is positioned in space at an optional angle moves linearly, friction between a moving portion and a fixed portion of the voice coil motor and friction between a moving portion and a fixed portion of a sensor can be prevented, the voice coil motor and the sensor are protected against being damaged, and the working performance of the voice coil motor and the working performance of the sensor are guaranteed.

Description

technical field [0001] The invention belongs to the design technology of voice coil motors, and relates to a built-in linear bearing anti-eccentricity structure for voice coil motors. Background technique [0002] There is a certain fit gap between the mover and the stator of the voice coil motor. It is necessary to ensure the coaxiality between the mover and the stator of the voice coil motor during operation. Otherwise, when the voice coil motor moves linearly at any angle in space, the voice coil The motor mover will rub against the enameled wire of the stator of the voice coil motor, leading to insulation damage, and finally causing the motor to fail to work normally; at the same time, a certain degree of coaxiality must be ensured between the stator of the sensor integrated inside the voice coil motor and the moving iron core of the sensor. The sensor is a signal element. When the sensor stator is stressed or the sensor stator and the sensor moving iron core are out of ...

AI Technical Summary

Problems solved by technology

[0002] There is a certain fit gap between the mover and the stator of the voice coil motor. It is necessary to ensure the coaxiality between the mover and the stator of the voice coil motor during operation. Otherwise, when the voice coil motor moves linearly at any angle in space, the voice coil The motor mover will rub against the enameled wire of the stator of the voice coil motor, leading to insulation damage, and finally causing the motor to fail to work normally; at the same time, a certain coaxiality must be ensured between the stator of the sensor integrated inside the voice coil motor and the moving iron core of the sensor. The sensor is a signal component. When the sensor stator is stressed or the axis between the sensor stator and the sensor moving iron core is out of alignment, the measurement signal will be seriously distorted.

In the past, the anti-eccentricity device mostly adopted the structure of external support. The mover of the voice coil motor was supported by the guide rail sleeve. When the support gap between the mover of the voice coil motor and the guide rail sleeve was too large, it could not maintain the coaxial effect, and the gap was too small. , the friction between the two is serious, resulting in serious noise interference, and at the same time shortening the life of the voice coil motor mover. This kind of guide rail sleeve has a complex supporting structure, large volume, and increased cost. Realized in the structure, restricting the application of the voice coil motor in the servo closed-loop control system

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