A method for self-detection of voice coil motor parameters

A voice coil motor, self-testing technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of low tolerance of motor parameter changes, affecting the stability effect of the control algorithm, and different stability effects, so as to avoid stability. diminished effect

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A voice coil motor, self-testing technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of low tolerance of motor parameter changes, affecting the stability effect of the control algorithm, and different stability effects, so as to avoid stability. diminished effect

CN109696630BActive Publication Date: 2021-01-26聚辰半导体(南京)有限公司

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[0038] In order to make the present invention more obvious and understandable, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Such as figure 1 As shown, in the present invention, the control chip is connected to the voice coil motor through the control interface, and the control chip drives the motor to different positions by controlling the current inside the voice coil motor. Through the control chip to input a step-change current to the motor, the displacement of the motor can be obtained, such as image 3 shown. in, image 3 The upper figure in the figure is the curve of current change with time (the abscissa is time, the ordinate is current), and the lower figure is the curve of motor displacement with time (the abscissa is time, and the ordinate is motor displacement). Depend on image 3 It can be seen that the change of motor displacement is a periodic damping oscillation.

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Abstract

The invention discloses a method for self-testing parameters of a voice coil motor. The method comprises: a control chip is connected with the voice coil motor through a control interface, and the control chip drives the motor to different positions by controlling the current inside the voice coil motor; The coil will cut the magnetic field line of the magnetic field inside the voice coil motor, and the induced electromotive force will be generated at both ends of the coil to obtain the induced voltage; the control chip will automatically detect the induced electromotive force; the control chip will measure and calculate the parameters of the voice coil motor according to the detected induced electromotive force. . The chip of the present invention detects the motor parameters without requiring the customer to test the motor parameters. Each chip corresponds to a motor, ensuring that each motor has its optimal control parameters; The parameter changes will lead to the weakening of the stabilization effect.

Description

technical field [0001] The invention relates to the fields of voice coil motor control and integrated circuit design, in particular to a voice coil motor parameter self-detection method. Background technique [0002] The position a voice coil motor moves is directly proportional to the current passing through its internal coil, i.e. the current determines the motor position. However, due to the structural characteristics of the voice coil motor, when a current is input to the inner coil of the voice coil motor, the position of the motor will oscillate, and the oscillation will not decay to a stable position until a long period of time. The stabilization algorithm of the voice coil motor can effectively reduce the vibration of the motor and make it stable quickly. [0003] When the voice coil motor fast and stable algorithm works, it is necessary to know the parameters of the motor. At present, customers use other measurement tools, such as laser range finders, to measure th...

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Application Information

Patent Timeline

26 Jan 2021

Publication

CN109696630B

IPC: G01R31/34

CPC: G01R31/343

Inventors: 陈珍珍; 张洪