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Motor driving apparatus

A technology of motor drive and motor, applied in the field of motor drive device, can solve the problems of increasing the shape of linear vibration motor, reducing the reliability of the drive device, increasing the cost, etc.

Inactive Publication Date: 2004-12-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the reliability of the drive unit as a linear vibration motor decreases
[0061] In addition, it is also possible to increase the size of the above-mentioned support spring, and when the operation of the linear vibration motor fails, the expansion and contraction of the support spring does not exceed the assumed range. However, in this case, not only the shape of the linear vibration motor increases, but also the cost increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] figure 1 It is a block diagram illustrating the motor drive device according to Embodiment 1 of the present invention.

[0162]The motor drive device 101a of the first embodiment has two operation modes for operating the linear vibration motor. One operation mode is an operation mode in which the linear vibration motor 100 is driven with a driving voltage or a driving current corresponding to a required motor output to operate a load connected to the linear vibration motor 100 . In this operation mode, the motor driver 101a calculates the position of the movable element of the linear vibration motor based on the driving voltage and the driving current while operating the above-mentioned load, and controls the drive of the linear vibration motor based on the calculated position of the movable element. . Still another operation mode is an operation mode in which the movable unit of the linear vibration motor 100 is allowed to vibrate freely, and the elastic constant k ...

Embodiment 2

[0207] figure 2 It is a block diagram illustrating the motor drive device 101b of the second embodiment of the present invention.

[0208] The motor drive device 101b of the second embodiment differs from the motor drive device 101a of the first embodiment only in that the elastic constant k in the position calculation for calculating the position of the movable member is calculated from the natural angular vibration number ω of the movable member. different.

[0209] That is, the motor drive device 101b of the second embodiment replaces the natural frequency detection unit 5a of the motor drive device 101a of the first embodiment, and has a detection function based on the timing when the freely vibrating movable member passes a certain fixed point (relative position). The natural angular vibration number detection unit 5b of the natural angular vibration number (natural angular velocity) ω of the moving assembly replaces the elastic constant determination unit 6a of the mot...

Embodiment 3

[0243] image 3 is a block diagram illustrating a motor drive device according to a third embodiment of the present invention.

[0244] The motor drive device 101c of the third embodiment differs from the motor drive device 101a of the first embodiment only in that the elastic constant k in the position calculation for calculating the position of the movable member is calculated from the natural vibration period T of the movable member. .

[0245] That is, the motor drive device 101c of the third embodiment replaces the natural frequency detection unit 5a of the motor drive device 101a of the first embodiment, and has a detection function based on the timing when the freely vibrating movable member passes a certain fixed point (relative position). The natural vibration period detection part 5c of the natural vibration period T of the moving assembly replaces the elastic constant determination part 6a of the motor drive device 101a of Embodiment 1, and has an elastic constant ...

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Abstract

An apparatus for driving a linear vibration motor having a spring member that supports a mover so as to form a spring vibration system including the mover, which employs an accurate spring constant of the spring member corresponding to an individual linear vibration motor at position calculation for obtaining the position of the mover during the operation, thereby increasing the accuracy of the position calculation. This motor driving apparatus includes a mover force vibration unit for making the mover of the linear vibration motor freely vibrate, a relative position detection unit for detecting a timing when the freely vibrating mover passes through a fixed point (relative position) , and a natural frequency detection unit for detecting a natural frequency of the mover on the basis of output information from the relative position detection unit, thereby deciding the spring constant on the basis of the detected natural frequency.

Description

field of invention [0001] The present invention relates to a motor drive, in particular to a motor drive for driving a linear vibration motor having a movable assembly and an elastic member supporting it. Background technique [0002] In the past, in equipment using linear vibration motors, there are vibration generators that transmit incoming calls through mechanical vibrations such as mobile phones, compressors that compress and circulate gas or liquid, or reciprocating electric shavers. In the shaver, the above-mentioned linear vibration motor is used as the drive source. [0003] A representative example of a linear vibration motor is a single-phase synchronous motor structure, that is, a movable component composed of a permanent magnet and a stator formed by winding a coil on an iron core. By applying an AC voltage to the coil, the movable component reciprocates. [0004] In this way, when the vibration is generated by the reciprocating motion of the movable component,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18F04B35/04F04B49/06H02K33/04H02P25/02
CPCF04B49/065F04B35/045H02P25/027H02K33/04F04B2201/0206F04B2203/0404H02P25/032H04L12/28H04W88/02
Inventor 植田光男中田秀樹吉田誠
Owner PANASONIC CORP
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