JPH05290500A - Method for controlling disk rotary motor for disk device - Google Patents

Abstract

PURPOSE:To shorten a starting time and to start with efficiency. CONSTITUTION:This is the method for controlling a disk rotary motor 12 at a disk device 1 for recording/reproducing information on a rotary disk 11 by a head 21. Information regarding the rotative angle position of the disk is recorded on the disk 11 beforehand. Then, the information about the rotative angle position is read by the head 21 and a controlling for starting or stopping the disk rotary motor is executed using this information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a disk rotating motor in a disk device. In recent years, the demand for disk devices, particularly magnetic disk devices, has been increasing more and more, and accordingly, there is a strong demand for downsizing, high performance, and low power consumption of magnetic disk devices.

Although a brushless DC motor is often used as a spindle motor for rotating a magnetic disk, it is difficult to secure a space for installing a rotation angle position detection sensor such as a Hall element due to a demand for a small size and thinness. The so-called Hallless spindle motor is becoming the mainstream. This hallless spindle motor cannot detect its own rotational angle position when it is stationary or rotates at low speed, and therefore cannot perform efficient start-up, and its improvement is desired.

[0003]

2. Description of the Related Art FIG. 8 is a block diagram of a conventional magnetic disk device 80. The magnetic disk device 80 includes a magnetic disk 81, a spindle motor 82, and a motor controller 8
3, a head 84, an R / W demodulation unit 85, a control unit 86 and the like.

The spindle motor 82 is a four-pole or eight-pole brushless DC motor having a three-phase winding, and has no rotation angle position detection sensor (hallless spindle motor) especially for downsizing and cost reduction. ).

The motor controller 83 sequentially switches the connection state of the voltage to the windings of each phase of the spindle motor 82 at a timing corresponding to the rotational angle position of the rotor, and the currents in the positive and negative directions are appropriately timing for each winding. And a zero-cross detector 92 for detecting the zero-cross point of the back electromotive force generated in the winding of the spindle motor 82 to obtain the commutation timing (for example, transistor technology 1991). August issue, pp. 555-562).

In the magnetic disk device 80, the rotation control of the spindle motor 82 is performed only by the motor control system including the motor controller 83, excluding the start command or the stop command, and the R / R including the head 84 and the like. It is performed independently from the W series.

[0007]

However, in the stationary state before the spindle motor 82 is started, the zero cross point cannot be detected because the back electromotive force is not generated in the winding. Therefore, the boot is performed by a special boot sequence.

For example, first, a current is passed through a specific winding of the spindle motor 82 to set the position of the rotor as a specific excitation state, and then commutation is forced at a low frequency to rotate like a synchronous motor. Then, the frequency is increased at a constant rate, and when the rotation speed reaches about 100 RPM, the control is switched to the normal control to complete the start-up.

However, in such a conventional control method, there is a possibility that the rotation may be reversed by a certain rotation angle in the initial stage of activation. Therefore, there is a high possibility that the magnetic disk 81 rotates in the reverse direction and a head crash occurs.

Further, since the open control is performed while the rotational speed is being increased by the forced commutation, the rate of increase in the rotational speed (frequency) must be reduced, which requires a long time to start, and Since the current efficiency is poor, the starting torque is low, and if the head 84 and the magnetic disk 81 are attracted to each other, they cannot be released, and as a result, the starting may be impossible.

Further, there are problems such as high power consumption and low efficiency, and particularly when the start and stop are frequently repeated, the overall performance is greatly reduced. The present invention has been made in view of the above problems, and an object thereof is to provide a method for controlling a disk rotation motor, which can shorten the startup time and efficiently start up the disk.

[0012]

In order to solve the above-mentioned problems, the method according to the invention of claim 1 records or records information by a head 21 on a rotating disk 11 as shown in FIGS. Disk device 1, 1a, 1b for reproducing
In the method of controlling the motor 12 for rotating the disk, information DPA relating to the rotation angle position of the disk is recorded on the disk 11, and the head 21
The information DPA related to the rotation angle position is read by and the control for starting or stopping the disk rotation motor 12 is performed using the information DPA.

The method according to the invention of claim 2 is the information DPA.
Is used to detect the rotation angle position when the disk rotation motor 12 is stopped and stored in the memory 43, and based on the rotation angle position stored in the memory 43, the next activation of the disk rotation motor 12 is performed. Performs control for startup at time.

The method according to the invention of claim 3 is the information DPA.
Is used to control the disk rotation motor 12 to stop at a predetermined rotation angle position. Claim 4
In the method according to the invention, the disk 11 is a magnetic disk, and the information DP related to the rotational angle position is included.
A is recorded in the CSS zone of the magnetic disk.

In the method according to the invention of claim 5, the disk 11 is a magnetic disk, and the head 21.
A magnetoresistive effect head is used as.

[0016]

The rotation angle position of the disk rotation motor 12 is
The information (positional information) DPA recorded on the disk 11 is obtained by reading with the head 21, and control for starting or stopping the disk rotation motor 12 is performed based on the positional information DPA.

When the memory 43 is used, the rotation angle position when the disk rotation motor 12 is stopped is stored in the memory 43, and the start control is performed based on the information read from the memory 43 at the next start. I do.

Further, when the disk rotation motor 12 is stopped at a predetermined rotation angle position based on the position information DPA, a predetermined startup control is performed at the time of startup.

[0019]

1 is a block diagram of a magnetic disk device 1 using a control method according to the present invention, FIG. 2 is a diagram showing a surface area of a magnetic disk 11, and FIG. 3 is position information DPA1 for the magnetic disk 11. It is a figure which shows the recording state of 2.

The magnetic disk device 1 includes a magnetic disk 1
1, spindle motor 12, head 21, R / W demodulation unit 22, control unit 23, power controller 31, switching unit 32, zero cross detection unit 33, rotation angle position detection unit 34.
Etc.

As shown in FIG. 2A, the magnetic disk 1
A data zone ZD for recording data and servo information and a CSS zone (contact start and stop zone) ZC for contact of the head 21 at the time of starting and stopping are provided on the surface of 1. CS
The S zone ZC is usually provided on the inner peripheral side of the data zone ZD.

The magnetic disk 11 is located in the CSS zone ZC.
Related to the rotation angle position PA of the
The DPA is recorded. The location information DPA is
The data is recorded over the entire circumference of the CSS zone ZC, but the recorded content and the recorded state differ depending on the number of poles of the spindle motor 12 and the operation of the rotation angle position detector 34.

For example, when the spindle motor 12 is an 8-pole brushless DC motor having a three-phase winding,
As shown in FIG. 2B, it is divided into four CSS zones ZC1 to ZC4 every 90 degrees, and as shown in FIGS. 3A and 3B, the CSS zones ZC1 to ZC4 have the same pattern. The position information DPA1 and 2 are recorded.

In FIG. 3A, the position information DPA1
Is the rotation angle position PA within each CSS zone ZC.
The data is magnetized so that the strength M of the magnetic pole increases with increasing. Such data is pulse-shaped data having a predetermined magnetic pole strength M for each bit, but may be data in which the magnetic pole strength M continuously changes.

Therefore, when this head position information DPA1 is read by the head 21, a head position information signal S1 having an output value corresponding to the rotation angle position PA in each CSS zone ZC is obtained. By comparing or calculating the information signal S1 with a reference value, for example, the position detection signal S corresponding to the rotation angle position PA is obtained.
2 can be output.

In FIG. 3B, the position information DPA2
Is the rotation angle position PA within each CSS zone ZC.
The data is magnetized so that the magnetic pole strength M increases stepwise as is increased. In this example,
The magnetic pole strength M is divided into 6 levels, and
The rotation angle position detection unit 34 outputs a position detection signal S2 indicating which of the positions of the six sections in each CSS zone ZC. With the position detection signal S2 indicating the positions of the six sections, the above-described control at the time of starting the spindle motor 12 can be completely performed.

It should be noted that, for example, from the position information signal S1 based on the position information DPA1 shown in FIG. 3A, the position detection signal S2 indicating the positions of the six sections as shown in FIG. 3B is output. The rotation angle position detector 34 can also be configured.

The switching unit 32 selects the position detection signal S2 from the rotation angle position detection unit 34 when the magnetic disk 11 is started, and when the rotation speed rises to, for example, about 100 RPM, or the zero cross detection unit 33 zero cross. When the point can be detected, the detection signal S3 from the zero-cross detector 33 is switched to be selected.
A command for switching the switching unit 32 is issued from, for example, an MPU (not shown).

The head 21 is an MR head (magnetoresistive effect head) using an MR element (magnetoresistive effect element) for reproduction, has no speed dependence unlike an inductive head, and has a magnetic disk. Data can be read even when 11 is rotating at a low speed or in a stationary state. Therefore, regardless of whether the spindle motor 12 is stationary or rotating, the above-mentioned position information DPA
It is possible to read 1 and 2 and output the position information signal S1 according to the strength M of the magnetic pole.

As the R / W demodulation unit 22, the control unit 23, the power controller 31, the zero-cross detection unit 33 and the like in the magnetic disk device 1, conventionally known ones are used. The control method of the spindle motor 12 in the above-mentioned magnetic disk device 1 is as follows.

That is, when the spindle motor 12 is started, the switching section 32 is switched to the position detection signal S2 side, and when the spindle motor 12 is stationary, the head 21 records the position information DPA recorded in the CSS zone ZC. To output the position information signal S1, and the rotation angle position detection unit 34 receiving this outputs the position detection signal S2.
Is output.

Since the position detection signal S2 indicates the rotational angle position PA of the spindle motor 12 in the stationary state, the power controller 31 performs start control based on the position detection signal S2 and the spindle motor 12 reverses. A current is supplied to the windings of each phase so as not to rotate, and after the rotation starts, commutation timing is obtained based on the position detection signal S2 to sequentially switch the winding connection state.

When the number of rotations of the spindle motor 12 increases, the switching unit 32 switches to select the detection signal S3 from the zero-cross detection unit 33, and thereafter the normal operation by the power controller 31 based on the detection signal S3. Control is performed. Further, the head 21 is the CSS zone ZC.
After ascending at, move to the target position in the data zone ZD. The control method when the spindle motor 12 is stopped is the same as the conventional one.

According to the above control method, the magnetic disk 1
When the head 21 reads the position information DPA recorded in No. 1, the rotation angle position PA of the spindle motor 12 is detected.
It is possible to obtain the spindle motor 12
Since it is possible to control the connection state of the windings at the time of startup, there is no fear that the spindle motor 12 will rotate in the reverse direction, so that the occurrence of head crush due to it is prevented, and the reliability of the magnetic disk device 1 is greatly improved. improves.

Further, since the connection state of the windings can be switched at an appropriate timing to allow a current to flow, the current efficiency can be improved, the starting time can be shortened, the starting torque can be increased, and the efficiency can be improved. The power consumption can be reduced.

Further, since the position information DPA1 and DPA2 are recorded in the CSS zone ZC, a special zone for recording the position information DPA is unnecessary, and the head 21 is moved to a special position at the time of starting and stopping. It is possible to read the position information DPA1 and DPA2 without moving them to.

FIG. 4 is a block diagram of a magnetic disk device 1a using another control method according to the present invention, FIG. 5 is a view showing a recording state of position information DPA3 on the magnetic disk 11, and FIG.
FIG. 6 is a diagram showing a state of the position detection signal S2 output from the counter 41. The constituent elements having the same functions as those of the magnetic disk device 1 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the magnetic disk device 1a, the position information D is stored in each of the CSS zones ZC1 to ZC4 of the magnetic disk 11.
As PA3, as shown in FIG. 5, a wide pulse Pw is recorded at the start position of each CSS zone ZC, and after the pulse Pw, a narrow pulse Pn is formed at regular intervals.
Is recorded.

Therefore, the position information signal S1 from the head 21 is one pulse having a wide width at the start position of each CSS zone ZC1 to ZC4 and a pulse having a narrow width corresponding to the rotation angle position PA.

The origin position detector 42 detects the position information signal S1.
The pulse width of the pulse is compared, and if the pulse is wider than before and after, it is set as the origin position signal S4 in the counter 41.
Output to.

As shown in FIG. 6, the counter 41 is reset to zero by the origin position signal S4, counts the pulses of the position information signal S1, and outputs the count value as the position detection signal S2. The position detection signal S2 is data having a value according to the rotation angle position PA.

Since the head 21 is in the CSS zone ZC at the start and end of recording or reproducing data on the magnetic disk 11, the position information DPA3 recorded in the CSS zone ZC at that time is read and the position information signal is outputted. S1
Is output, and the position detection signal S2 is output from the counter 41.

At the end of recording or reproducing data on the magnetic disk 11, the final value of the position detection signal S2 output from the counter 41 is stored in the memory 43. That is, the memory 43 stores the rotation angle position PA when the spindle motor 12 is completely stopped.

Then, when the spindle motor 12 is activated next time, the final value S of the position detection signal S2 is read from the memory 43.
2a is read, and activation control is performed based on the final value S2a.

That is, the power controller 31a controls the start-up of the spindle motor 12 based on the final value S2a so that the spindle motor 12 does not rotate in the reverse direction.
Based on the position detection signal S2 output from No. 1, the commutation timing is obtained and the connection state of the winding is sequentially switched, and when the rotation speed increases, normal control is performed based on the detection signal S3. Then, at the time of stop, the final value S2a of the position detection signal S2 is stored in the memory 43 and used for control at the next start.

According to the magnetic disk device 1a, the same effect as described above can be obtained, and the position information DPA can be obtained.
Recording on the magnetic disk device 1 is easy because 3 is simply a pulse.

FIG. 7 is a block diagram of a magnetic disk device 1b using another control method according to the present invention. The constituent elements having the same functions as those of the magnetic disk device 1a described above are designated by the same reference numerals and the description thereof will be omitted.

In the magnetic disk device 1b, when the spindle motor 12 is stopped, the spindle motor 1
The control is performed so that 2 stops at the predetermined rotation angle position PA.

That is, during the stop control of the spindle motor 12, the head 21 reads the position information DPA3 recorded on the magnetic disk 11 and outputs the position information signal S1, and the counter 41 outputs the position detection signal S2.
However, the origin position detection unit 42 outputs the origin position signal S4.

The power controller 31b controls the switching speed or the current value of the connection state of the windings of each phase of the spindle motor 12, and for example, the four CSS zones ZC.
Stop at any of the starting positions (origin position). As a result, the spindle motor 12 is always in the stationary state at the origin position.

Next, when the spindle motor 12 is started, a current is passed through the windings of each phase to control the start so that the rotation angle position PA of the spindle motor 12 does not reversely rotate from the origin position. After that, control is performed based on the position detection signal S2 output from the counter 41.

According to this, the same effect as described above can be obtained without using the memory 43. In the above embodiment, each CSS zone ZC of the magnetic disk 11 is used.
Although the position information DPA2, 3 in 1 to 4 is divided into 6 stages, it may be divided into more stages or a large number of pulses may be recorded. Although the CSS zone ZC is divided into four, the position information DPA may be recorded at an angle of 360 degrees without being divided. It may be divided into two.
The number of sections can be changed according to the number of phases and the number of poles of the spindle motor 12.

In the above embodiment, the CSS zone ZC
The recording state of the position information DPA on the recording medium can be changed in various ways other than the above. For example, the pulse recording density may be changed for each stage in each CSS zone ZC. Alternatively, pulse signals of different frequencies are recorded and the head 21
The position detection signal S2 may be created by integrating the position information signal S1 from.

In the above embodiment, CSS zone Z
Although the origin position signal S4 is obtained from the position information DPA recorded in C, the origin position signal S4 may be obtained based on the servo information recorded in the data zone ZD. The origin position signal S4 may be only one for one rotation (360 degrees).

In the above-described embodiment, the configurations of the magnetic disk devices 1, 1a, 1b and the configuration of each part can be modified in various ways other than those described above. The present invention can also be applied to an optical disk device, a magneto-optical disk device, or the like.

[0056]

According to the present invention, when the disk rotation motor in the disk device is started, the starting time can be shortened and the motor can be efficiently started.

According to the second aspect of the invention, it is easy to record the position information on the disc. According to the invention of claim 3,
It is easy to record the position information on the disk and it is not necessary to use a memory.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic disk device using a control method according to the present invention.

FIG. 2 is a diagram showing a surface of a magnetic disk.

FIG. 3 is a diagram showing a recording state of position information on a magnetic disk.

FIG. 4 is a block diagram of a magnetic disk device using another control method according to the present invention.

FIG. 5 is a diagram showing a recording state of position information on a magnetic disk.

FIG. 6 is a diagram showing a state of a position detection signal output from a counter.

FIG. 7 is a block diagram of a magnetic disk device using still another control method according to the present invention.

FIG. 8 is a block diagram of a conventional magnetic disk device.

[Explanation of symbols]

 1, 1a, 1b Magnetic disk device 11 Magnetic disk (disk) 12 Spindle motor (disk rotation motor) 21 Head 43 Memory DPA Position information (information related to rotational angle position) ZC CSS zone

Claims (5)

[Claims] 1. A method for controlling a disk rotation motor (12) in a disk device (1, 1a, 1b) for recording or reproducing information on a rotating disk (11) by a head (21), comprising: Information (DPA) related to the rotation angle position of the disk is recorded on the disk (11), the information (DPA) related to the rotation angle position is read by the head (21), and the information (DPA) is read. A method for controlling a disk rotation motor in a disk device, wherein the control for starting or stopping the disk rotation motor (12) is performed by using the above. 2. A method for controlling a disk rotation motor (12) in a disk device (1, 1a, 1b) for recording or reproducing information on a rotating disk (11) by a head (21), comprising: Information (DPA) related to the rotation angle position of the disk is recorded on the disk (11), the information (DPA) related to the rotation angle position is read by the head (21), and the information (DPA) is read. Is used to detect the rotation angle position when the disk rotation motor (12) is stopped and stored in the memory (43), and based on the rotation angle position stored in the memory (43),
A method for controlling a disk rotation motor in a disk device, comprising performing control for starting the disk rotation motor (12) at the next startup. 3. A method for controlling a disk rotation motor (12) in a disk device (1, 1a, 1b) for recording or reproducing information on a rotating disk (11) by a head (21), said method comprising: Information (DPA) related to the rotation angle position of the disk is recorded on the disk (11), the information (DPA) related to the rotation angle position is read by the head (21), and the information (DPA) is read. A method for controlling a disk rotation motor in a disk device, characterized in that the disk rotation motor (12) is controlled so as to stop at a predetermined rotation angle position using. 4. The disk (11) is a magnetic disk, and information (DPA) related to the rotational angle position is recorded in a CSS zone of the magnetic disk. 4. A method for controlling a disk rotation motor in the disk device according to any one of 3 above. 5. The disk device according to claim 1, wherein the disk (11) is a magnetic disk, and the head (21) is a magnetoresistive head. Method for controlling disk rotation motor in.