Method for correcting nonlinearity of zero magnetic region of closed-loop voice coil motor magnet

A voice coil motor, zero magnetic area technology, applied in the estimation/correction of motor parameters, DC motor speed/torque control, electrical components, etc. and other problems, to achieve the effect of improving the photographing effect, good linearity, and improving linearity.

Pending Publication Date: 2021-11-23
GIANTEC SEMICON LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existence of non-linearity will affect the accuracy of the position of the voice coil motor, t

Method used

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  • Method for correcting nonlinearity of zero magnetic region of closed-loop voice coil motor magnet
  • Method for correcting nonlinearity of zero magnetic region of closed-loop voice coil motor magnet
  • Method for correcting nonlinearity of zero magnetic region of closed-loop voice coil motor magnet

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Embodiment Construction

[0032] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0033] A method for correcting the nonlinearity at both ends of the magnetic field of a closed-loop voice coil motor proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and all use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In order to make the objects, features and advantages of the present invention more comprehensible, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attac...

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Abstract

The invention discloses a method for correcting the nonlinearity of a zero magnetic region of a closed-loop voice coil motor magnet, and the method comprises the steps: setting a Hall assembly which has a certain length, and enabling the two ends of the Hall assembly to be symmetrical about the center of a magnetic field; when the closed-loop voice coil motor moves, enabling the Hall assembly synchronously to move along with the closed-loop voice coil motor; and adopting the Hall assembly for sensing the change of a magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves towards the positive direction and the negative direction, taking the magnetic field sensed by the Hall assembly in a linear section as a motor position signal. The method has the advantages that the Hall assembly with the two ends symmetrical about the center of the magnetic field is arranged, when the closed-loop voice coil motor moves, and the magnetic field induced by the Hall assembly located in the linear section serves as a motor position signal, so that the linearity of the motor position in the whole stroke is better, and the photographing effect of the closed-loop voice coil motor is improved.

Description

technical field [0001] The invention relates to the technical field of voice coil motor control, in particular to a method for correcting the non-linearity of the zero magnetic zone of a closed-loop voice coil motor magnet. Background technique [0002] With the continuous improvement of mobile phone camera quality requirements, in recent years, more and more products use closed-loop control voice coil motors as mobile phone camera lens drive motors. [0003] In the closed-loop control voice coil motor, the position of the motor is determined by the magnitude of the magnetic field induced by a Hall sensor in the magnetic field. The motor will drive one of the Hall and the magnet to move, and the other of the Hall and the magnet will be fixed on the bracket; when the motor moves, the relative position of the Hall and the magnet will change, so that the Hall sensed The magnitude of the magnetic field changes; the closed-loop control voice coil motor determines the different p...

Claims

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Application Information

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IPC IPC(8): H02P25/034H02P7/025H02P23/14
CPCH02P25/034H02P7/025H02P23/14
Inventor 陈珍珍陈君飞张洪
Owner GIANTEC SEMICON LTD
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