KR20010073883A - Apparatus for controlling moving speed of actuator and method thereof - Google Patents

Abstract

PURPOSE: An actuator moving speed controlling system and a method thereof are provided to controlling the transferring speed of the actuator on a ramp regardless of change in temperature in a disk driving apparatus. CONSTITUTION: In a ramp servo mode, outputs from a location sensor and a temperature sensor are detected. According to the outputs, a location data for an actuator is obtained. Then, the location data are obtained for twice. The location data are converted into speed data. Then, a transferring speed of the actuator on a ramp is controlled. In case of a present mode other than a disk servo mode, the process is repeated for controlling the transferring speed of the actuator. In case of the disk servo mode, the ramp servo mode is completed.

Description

Apparatus for controlling moving speed of actuator and method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator provided in a disc drive device, and more particularly, to an apparatus and a method for controlling a moving speed during loading / unloading of an actuator.

A disk drive is like a hard disk drive, and an actuator is a device used to move a data converter such as a read / write head over the surface of a disk. Early disk drives have an actuator inside the disk when stopped. As the disc size is gradually reduced in size, as shown in FIG. 1, a disc driving device implemented to be loaded in a separate member has been proposed.

FIG. 1 shows a disk 100 and a ramp around a pivot axis p by an electric current flowing through a voice coil motor 110 by an actuator 112 supporting a head h at a distal end. A disk drive device installed so as to allow rotational movement therebetween, wherein the member on which the actuator 112 is to be loaded is a lamp 116. Actuator 112 is composed of a leaf spring-type suspension is installed on the arm (arm) to which the pivot shaft (p) is coupled, the head (h) is installed on the slider (slider) that is the front end of the suspension, the slider An extension tab 114 protruding at the end of is mounted on the lamp 116 to load the actuator 112.

That is, when the disc drive device is started, the actuator 112 operates to fly the head h along the signal plane track of the disc 100 to reproduce data recorded on the disc 100 or to record new data. On the other hand, it is operated to be loaded on the lamp 116 provided at the outside of the disk 100 at the time of stopping. The ramp 116 is a more gently inclined slide portion such that the expansion tab 114 of the actuator 112 extends to the steep slope portion 118, the steep slope portion 118 to facilitate entry onto the ramp 116. 120, it may be divided into a parking portion 118 on which the expansion tab 114 is seated.

In order to operate the drive of the actuator 112 separately when the disc drive device starts and stops as described above, the disc drive device forms a disc servo loop to control the speed of the actuator 112 and stops when the disc drive device starts. At this time, a ramp servo loop is formed to control the speed of the actuator 112.

FIG. 2 is a functional block diagram of a device for controlling the moving speed of the actuator 112 by forming a disc servo loop and a ramp servo loop as described above in the disc drive device. The header mounted on the lower end of the slider 200 is shown in FIG. When position data on the current disk is obtained through a data converter (not shown) such as (h), it is transmitted to an arm electronics module 201. The arm electric circuit module 201 abbreviates the position data transmitted from the data converter (not shown) as the position error signal (PES) while the operation cycle is controlled by the control signal provided from the system controller 207. The conversion unit 203 converts the data into a form recognizable by the generator 203 and transmits it to the position error signal generator 203.

Accordingly, the position error signal generator 203 generates a position error signal corresponding to the difference between the reference track (the track to be reached) and the track where the current actuator 112 is located. The generated position error signal is transmitted to the actuator seek and position control 205 to output a speed control signal for controlling the moving speed of the actuator 112. The output speed control signal is transmitted to the contact point b of the switch 209.

The switch 209 is controlled by the system control unit 207 to switch to the contact b when the corresponding disk drive is operated in the disk servo loop, and to the contact a when it is operated in the lamp servo loop.

The speed control signal transmitted to the zero order holder (also referred to as zoh) 211 through the switch 209 is maintained until the next speed control signal is applied, and to this maintained speed control signal. The corresponding voltage is provided as the driving voltage of the VCM driver 213. Accordingly, the VCM driver 213 provides a current to the voice coil motor 110 provided at the end of the actuator 112 so that the actuator 112 moves toward the desired track.

On the other hand, when the disk drive stops, the system control unit 207 controls the switch 209 to switch to the contact a to form a lamp servo loop. In addition, the adaptive speed detector 219 is a voltage signal according to the distance between the button magnet 213 mounted on the actuator 112 and the Hall effect sensor 215 attached to the housing (not shown) of the disk drive device so as to face it. When is applied through the signal line 217, the corresponding speed is detected and output.

In this case, the adaptive speed detector 219 is an algorithm using a linear equation to accurately detect the current moving speed of the actuator 112 in consideration of the fact that the output voltage of the Hall effect sensor 215 varies with temperature. It is configured to detect the speed.

That is, the disc drive device may generate a difference of about 30 ° when the internal temperature is severe at the time of initial start-up and operation. The output characteristic of the Hall effect sensor 215 is increased when the internal temperature of the disc drive device is increased. As shown in FIG. 2, the output characteristic according to the distance from the button magnet 213 is moved in the dotted line direction from the solid line. Accordingly, the voltage curve of the Hall effect sensor 215 is reduced by focusing on the fact that the moving stroke of the actuator 112 on the lamp 116 is small as 3 mm in order to detect accurate speed information of the actuator 112. Assuming a piecewise linear within the 3mm stroke, the speed information is detected by simplifying the equation of the straight line as described above.

The detected speed information is transmitted to the summer 223 to detect a difference from the reference speed provided from the reference speed provider 221, and the speed difference is compensated by the speed compensator 225 to switch the switch 209. It is transmitted to the zero command holding unit 211 and provides a moving current to the voice coil motor 110 provided at the end of the actuator 112 in the same way as in the disk servo loop, thereby providing an actuator 112 on the lamp 116. Control the speed of movement.

However, since the output characteristic of the actual Hall effect sensor 215 is a non-linear curve as shown in FIG. 3, an error is included when the entire stroke 3mm is assumed to be a straight line, and thus the actuator 112 on the lamp 116 is included. There is a problem that does not accurately detect the moving speed of.

In addition, due to this problem, the movement speed of the actuator 112 on the lamp 116 cannot be accurately controlled, and the disk 100 surface and the moment when the expansion tab 114 is moved from the lamp 116 to the disk 100 surface. If the expansion tab 114 collides with particles, the slider 200 and the disk 100 may be damaged, and the damage of the disk 100 may be stored in the disk 100. It may also lead to loss of data.

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and provides an apparatus and method for controlling the movement speed of an actuator for controlling the movement speed of the actuator on a ramp at a desired speed irrespective of the temperature change inside the disc drive device. There is a purpose.

1 is a schematic perspective view of peripheral components around an actuator in a conventional disc drive device.

2 is a functional block diagram of a conventional actuator moving speed control device in the disk drive device.

FIG. 3 is an output characteristic diagram of the hall effect sensor according to the distance between the hall effect sensor and the button magnet shown in FIG. 2.

4 is a functional block diagram of an actuator movement speed control apparatus according to the present invention.

FIG. 5 is a detailed block diagram of the speed detector shown in FIG. 4.

FIG. 6 is a network diagram of the neural network shown in FIG. 5.

7 is a flowchart illustrating a method of controlling an actuator moving speed in the lamp servo mode.

<Description of the symbols for the main parts of the drawings>

112: actuator 116: lamp

213: Button magnet 215: Hall effect sensor

401: temperature sensor 410: speed detection unit

501: analog-to-digital converter 503: neural network

In order to achieve the object of the present invention, the apparatus according to the present invention is a disk drive device configured to load an actuator to a member provided on the outside of the disk in the stop mode, the first sensor for detecting the position of the actuator ; A second sensor for detecting a temperature in the disk drive; A speed detector detecting a current moving speed of the actuator based on a sensing result of the first sensor and a sensing result of the second sensor; A reference speed providing unit providing reference movement speed data of the actuator in the stop mode; a speed compensating unit compensating for a difference between the movement speed data provided by the speed detecting unit and the reference speed providing unit, respectively; It is preferable to include means for controlling the moving speed of the actuator on the member by the speed control signal output from the speed compensating unit.

In order to achieve the object of the present invention, the method according to the present invention is a disc drive device configured to load an actuator to a member provided on the outside of the disc in a stop mode, wherein the operation mode of the disc drive device is set to the actuator. Starting an operation mode for loading, measuring the output of the position detection sensor of the actuator and the output of the temperature detection sensor in the disk drive, respectively; Acquiring current position data of the actuator using the position data and the temperature data measured in the measuring step; Converting the position data acquired in the obtaining step into velocity data; Compensating the difference between the speed data converted in the conversion step and the reference speed data for the actuator on the member to control the movement speed of the actuator on the member.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

FIG. 4 is a functional block diagram of an actuator moving speed control apparatus according to the present invention in a disk drive device. The signal line 403 and the signal line 403 for transmitting sensing results of the temperature sensor 401 and the temperature sensor 401 are shown in FIG. Other components except for the speed detector 410 which detects the moving speed of the current actuator 112 in consideration of both the sensing result of the temperature sensor 401 and the result detected by the hall effect sensor 215 are shown in FIG. 2. It is configured and operated in the same manner as shown in FIG. The remaining components are Voice Coil Motor (also referred to as VCM) 110, Actuator 112, Expansion Tab 114, Slider 200, Arm Electrical Circuit Module 201, Position Error Signal Generation The unit 203, the actuator seek and position control unit 205, the system control unit 207, the switch 209 for differently setting the transmission path for the speed control signal according to the disc servo loop and the ramp servo loop, and the zero command holding unit ( 211), VCM driver 213, button magnet 213, Hall effect sensor 215, signal line 217 for transmitting the voltage output from the Hall effect sensor 215, reference speed providing unit 221, summer 223, and the speed compensator 225.

Therefore, when the disc servo loop (corresponding to the start mode as the disc servo mode) is set, the operation of controlling the movement speed of the actuator 112 is the same as in FIG. 2 described above, and thus description thereof will be omitted and the lamp servo will be omitted. The following description will be given only when the motor is set and operated in the loop (or the ramp servo mode corresponding to the stop mode).

First, the temperature sensor 401 is mounted at any position of the housing (not shown) of the corresponding disk drive, and measures the temperature in the disk drive in the same manner as the existing temperature sensors.

The speed detector 410 is configured to include an analog / digital converter 501 and a neural network 503 as shown in FIG. 5 to detect the position data of the current actuator 112 and use the detected position data. Detect the current moving speed data.

That is, the speed detecting unit 410 has a relative distance between the button magnet 213 and the Hall effect sensor 215 mounted at an arbitrary position of the housing (not shown) of the disc drive device to face the button magnet 213 through one input terminal thereof. Receives an output voltage corresponding to the position data of the actuator 112 according to. This voltage signal is applied via the signal line 217. In addition, the speed detector 410 receives an output voltage corresponding to temperature data inside the disk drive device output from the temperature sensor 401 through the other input terminal. This temperature data is applied via the signal line 403.

The output voltage of the received Hall effect sensor 215 and the output voltage of the temperature sensor 401 are respectively applied to the A / D converter 501 and converted into a digital form. The output voltage of the Hall effect sensor 215 and the output voltage of the temperature sensor 401 converted to the digital form are respectively transmitted to the neural network 503.

The neural network 503 subdivides the lowest temperature and the highest temperature range of the corresponding disk drive, and learns based on the actual position of the actuator 112 and the output voltage obtained from the Hall effect sensor 215 according to the subdivided temperature conditions. It is configured to operate with the obtained weight matrix. That is, the neural network 503 has the output voltage of the Hall effect sensor 215 and the output voltage of the temperature sensor 401 as input nodes, as shown in FIG. 6, and includes one or more intermediate layers, and includes a Hall effect sensor ( 215 and the button magnet 213 are configured to set the relative position data as the output node. The learning algorithm for obtaining the weight matrix uses a known algorithm such as a back propagation algorithm.

When the position data according to the distance between the Hall effect sensor 215 and the button magnet 213 corresponding to the temperature of the current disk drive device is detected through the neural network 503, the detected position data is converted into velocity data and output. do. The method of converting the position data into the velocity data uses a known method.

As such, when the speed data of the current actuator 112 is detected by the speed detector 410, the speed detector 410 is transmitted to the summer 223. The summer 223 detects a difference between the reference speed provided by the reference speed provider 221 and the speed data provided by the speed detector 410. At this time, the reference speed provided by the reference speed providing unit 221 is a moving speed of the desired actuator 112 on the ramp 116.

The speed difference detected by the summer 223 is transmitted to the speed compensator 225. The speed compensator 225 compensates for the speed control signal for controlling the moving speed of the actuator 112 according to the applied speed difference. The compensated speed control signal is transmitted to the zero command holding unit 211 through the switch 209. Accordingly, the zero command holding unit 211 drives the VCM driver 213 to adjust the moving speed of the actuator 112. Take control.

FIG. 7 is a flowchart illustrating a method of controlling a moving speed of the actuator 112 according to the present invention in a lamp servo mode in which a lamp servo loop is formed and operated. If the result of the check is the start of the lamp servo mode, the process proceeds to step 703 to measure the output of the position detection sensor and the temperature detection sensor, respectively. In this case, the button magnet 213 and the hall effect sensor 215 of FIG. 4 are used as the position detection sensor, and the temperature sensor 401 of FIG. 4 is used as the temperature detection sensor.

Then, the flow proceeds to step 705 to acquire the position data of the current actuator 112 according to the measured position detection result and the temperature detection result, respectively, and proceeds to step 707 to acquire the position data in step 705 over two samples. . That is, the position data of the actuator 112 is obtained by measuring the outputs of the position detection sensor and the temperature detection sensor twice.

The process proceeds to step 709 to convert the velocity data using the position data acquired twice, and then proceeds to step 711 to control the movement speed of the actuator 112 on the ramp 116, and checks in step 713 As a result, if the current operation mode is not the disk servo mode, the process returns to step 703 to continuously repeat the process of controlling the movement speed of the actuator 112 in the ramp servo mode. However, if it is checked in step 713 that the current operation mode is a disc servo mode, the flow proceeds to step 715 to end the lamp servo mode.

In the above-described embodiment, the position data of the current actuator 112 is detected using the button magnet 213 and the hall effect sensor 215. However, the output is influenced according to the temperature, such as a capacitance sensor. The present invention can be applied to a disk drive device implemented to detect position data using the received position detection sensor.

As described above, the present invention implements the movement speed of the actuator more accurately by detecting the current position of the actuator in the disc drive device and controlling the movement speed of the actuator during loading and unloading in consideration of the sensing result of the temperature sensor. By controlling the loading and unloading of the actuators stably by controlling, the existing problems may be solved as loading and unloading operations such as collision of the expansion tab (or slider) and the disk surface are unstable.

Claims (4)

A disc drive device configured to load an actuator into a member provided outside the disc in the stop mode, A first sensor for detecting a position of the actuator; A second sensor for detecting a temperature in the disk drive; A speed detector configured to detect a current moving speed of the actuator based on a sensing result of the first sensor and a sensing result of the second sensor; A reference speed providing unit for providing reference movement speed data of the actuator in the stop mode; A speed compensator for compensating a difference between the moving speed data provided by the speed detector and the reference speed provider; And a means for controlling the moving speed of the actuator on the member by the speed control signal output from the speed compensating unit. The method of claim 1, wherein the speed detector. A converter for converting a signal output from the first sensor and a signal output from the second sensor into digital signals, respectively; Movement of an actuator including a neural network operated as a weight matrix using the output signal of the first sensor and the output signal of the second sensor transmitted from the transducer as input nodes and the current position data of the actuator as output nodes. Speed control. A disc drive device configured to load an actuator into a member provided outside the disc in the stop mode, Measuring an output of a position detection sensor of the actuator and an output of a temperature detection sensor in the disk drive when the operation mode of the disk drive starts the operation mode for loading the actuator; Acquiring current position data of the actuator using the position data and the temperature data measured in the measuring step; Converting the position data acquired in the obtaining step into velocity data; Compensating for the difference between the velocity data converted in the converting step and the reference velocity data for the actuator on the member to control the movement speed of the actuator on the member. The method of claim 3, wherein the acquiring of the position data is performed by using the result of detecting the outputs of the position detection sensor and the temperature detection sensor at least twice. .