JPH01113955A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To perform an electric power source control with excellent efficiency capable of a power saving operation by dividing an electronic circuit part, controlling their electric power sources independently and controlling also the connection system for a stator coil in a spindle motor with a delta/star conversion circuit in an electric power source control circuit. CONSTITUTION:An electric power source for electronic circuit 10 for the 2nd electronic circuit part 45 which is not used but for an ordinary operation is cut off by a power saving signal from the 1st electronic circuit part 41, while the spindle motor 500 which is not required but for the ordinary operation is deteriorated a little in its characteristics of torque and rotational fluctuation, etc., by the power saving signal. That is, the motor 500 whose specific performance required for a head disk assembly 60 in the use of DELTA-connection at the time of the ordinary operation is operated by Y-connection in this case. By this method, a low electric power consumpting operation is feasible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic disk device, and particularly to a power control system for a magnetic disk device that requires low power consumption.

(Prior art) When using a magnetic disk device as a component of an information processing system, consideration must be given to controlling multiple magnetic disk devices with one or more host devices (control devices) and operating them efficiently. has been done.

For example, when there is a magnetic disk storage system that is not used at all in a certain series of operations or is used infrequently on a polar lake, the system is turned off by a power control signal from the host device. The system is designed to reduce the amount of power consumed by the system.

(Problems to be Solved by the Invention) In conventional magnetic disk management, the host device performs the 'it source titlJ! 1X] was only an instruction to turn on or turn off the power, so the power control circuit of the device was used as a power source for the electronic circuit that drives the electronic circuit section, and for driving the spindle of the head disk assembly (hereinafter referred to as HDA). The motor drive power was turned on and off at the same time.

FIG. 2 is a block diagram showing an example of a power control system for a magnetic disk device according to the prior art.

In the second factor, 10 is a power supply for electronic circuits, 20 is a control power supply, 30 is a power supply control circuit, 40 is an electronic circuit section, SO is a spindle motor, 51 is a belt, 60 is a head disk assembly, 100 is a host device, Reference numeral 101 is an upper inter-2 ace signal line.

In FIG. 2, the AC power line 1 is 'Ij! When the main switch 2 is connected and the main switch 2 is turned on, the control power supply 20 sends a DC output to the power supply control circuit 30 via the DC power output port 21. When a power supply control signal arrives from the host device f1100 via the signal line 3 to instruct power-on, the power supply control circuit 30 connects the electronic circuit power supply 10 via the signal line 31.
At the same time, the belt 51
To rotate the HDA 80 via the signal 432t-
Motor drive power is sent to the spindle motor 50 through the motor.

As a result, the electronic circuit unit 40 is supplied with the DC power output from the electronic circuit power supply 10, and the electronic circuit unit 40 becomes operable. Also, when a power-off instruction is sent,
The supply of motor drive power sent to the spindle motor 50 via the signal line 32 is stopped, and a power off signal is sent on signal #31 to stop the electronic circuit power supply 10.

Normally, in this type of magnetic disk device, immediately after the magnetic disk plate inside HDA8G is rotated and driven, f(DA6
The internal temperature change of 0-'Ii is severe and there are problems such as thermal positional deviation, and it is difficult to immediately perform a read or write operation because the operation is unstable. Therefore, in order to increase the data reliability fJ4 degrees, HDA
It is necessary to wait several minutes until the temperature change inside 6(1) stabilizes to some extent and problems due to thermal misalignment no longer occur.

Therefore, once a magnetic disk device has been started up, if the frequency of access to the device from the host device is extremely low, it is recommended to turn off the power and keep it in a stable state in order to reduce system power consumption. There is also a problem in that the above-mentioned waiting time is required to restart the system when access arrives. For this reason, in actual systems, it is almost impossible to turn off the power using a power control signal, and this has the drawback of not being able to perform detailed and efficient power control.

Objective 6 of the present invention is to divide the electronic circuit section to perform power control on a separate side, and to change the wiring system of the stator windings in the spindle motor to the delta/star conversion circuit (hereinafter referred to as By controlling the delta as Δ and star as Y, the above disadvantages are eliminated and power is saved while keeping temperature fluctuations inside HT)A within a range that does not affect actual read/write operations. An object of the present invention is to provide a magnetic disk device configured to be operable and capable of efficient power control.

C) A magnetic disk drive according to the present invention includes a control ill power source, a first electronic circuit section, a second electronic circuit section, a three-phase induction motor, and a delta/star conversion. It is configured to include a circuit and a power supply control circuit.

The control power source is activated when the main switch is turned on, and is used to obtain the first and second DC power outputs.

The first electronic circuit section receives ml directly from the control power supply.
Driven by the lft'lt source output, the host device continuously reads/writes for a certain period of time,'! Nine is read/
It detects a state in which there is no access that requires a series of operations such as write and accompanying seek operations, and outputs a power save signal while monitoring the control circuit status signal and responds when there is a request to report the device status from the host device. This is a rounded version of the report.

the second electronic circuit section operates together with the first electronic circuit section;
It is a rounding device that performs normal operations including reading/writing in response to requests from the host device.

Three-phase induction motors can have the starting end of the stator windings and the road shoulder all externally to form a delta connection or a star connection, and are used to drive the spindle of the head disk assembly. It is.

The delta/star conversion circuit converts the three-phase induction motor into delta connection when the power save signal is invalid, and converts the three-phase induction motor into star connection when the power save signal is valid.

The power supply control circuit is driven by the eighth DC power output from the control power supply, and is driven by the power supply control signal from the host device and the power save signal from the first electronic circuit power supply to control the second electronic circuit section. In order to drive the motor, it outputs a power on/off signal that turns on/off the power for the electronic circuit, and is used together with the delta/star conversion circuit to control the motor operation and to indicate a series of control states. 4 for outputting circuit status signals.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a magnetic disk device according to the present invention.

I! In Figure 1, 2 is a main switch, 10 is an electronic circuit power supply, 20 is a control power supply, 40 is an electronic circuit section, 41
．． 45 are respectively fal and second electronic circuit section, SO
is HDA, 10G is host device, 30G is power control circuit,
310 is the Δ/Y conversion circuit, and soo is the spindle motor shaft.

In FIG. 1, a signal line 10 is used to exchange necessary commands and various information with a host device (control device) 100.
The upper device interface signals on 1 are used. Continuous reading/writing from the host device 100 for a certain period of time,
9 is the first when there is no associated seek operation request.
The electronic circuit section 41 detects its state based on the host device interface signal on the signal line 101, and sends out a warsave signal on the signal line 42.

At this time, if there is a request to report the device status from the host device 100, the first electronic circuit section 41 is the minimum necessary circuit to be able to report the request at any time. Second
The electronic circuit 4S responds to a request from the host device 100 to
This circuit is necessary together with the first electronic circuit section 41 to perform normal operations including read/write and associated seek operations for A80. The electronic circuit section 40 is
@1 and second electronic circuit section 41. It is established from '4S.

Upper device [power control signal from 10G to signal line 3 and
With the power save signal from the electronic circuit section 41, @
Power supply 1 for the electronic circuit, which drives the electronic circuit section 4S of 2.
The power supply control circuit 3 is activated by the power save signal from the first electronic circuit section 41.
The Δ/Y conversion circuit 310 of 00 connects the stator winding of the three-phase induction motor 500 to the Δ connection, and the Δ/Y conversion circuit 310 connects the stator winding of the three-phase induction motor 500 to the Y connection. The control power supply 20 is for driving the first electronic circuit section 41 and the power supply control circuit 300. On the other hand, in the three-phase induction motor SOQ, the stator windings can be connected in a Δ connection system or in a Y connection system, depending on the connection number with the lead wires drawn out to the outside.

Next, its operation will be explained.

When the AC power supply 1 is input to the magnetic disk device and the main switch 2 is turned on, the control power supply 20 immediately sends the eighth DC power output to the power line 2 to drive the power supply control circuit.
1, and a first DC power output for driving the first electronic circuit section 41 is sent onto the power supply line 22. At this time, the first electronic circuit section 41 first sets its own circuit section to an initial state, enters a power-on reset state, and resets the power save signal on the signal line 42.

In this state, when a power-on instruction is sent to the t source control circuit 300 by the power control signal from the host device 100 to the signal line 3, the power source control circuit 30G
In order to input 0, a power-on signal is output onto the signal line 31. At the same time, Δ/Y constituting the power supply control circuit 300
The conversion circuit 310 allows the fixed pre-winding of the three-phase rust induction motor S00 for driving the spindle of the HDA60 +! Ii! 'tΔ connection is made to output the motor drive power source 3G2.

Several minutes have passed after the HDA 60 reaches steady rotation, and the circuit section 40 switches to the upper level! Read against 10G/
It is notified by the 9 upper-level device interface signal on the signal line 101 that write operations, seek operations, etc. are possible. After this, when there is no continuous access from the host R100 for a certain period of time, the magnetic disk drive sends a power save signal from the first electronic circuit section 41 to the power supply control circuit 300 via the signal 1!42. Send to.

At this time, the power supply control circuit section 30G
0 converts the stator winding of the three-phase induction motor SOO into a Y-connection, and outputs the motor drive power source 302. At this time, the voltage between each phase of the stator winding of the three-phase induction motor S00 is Δ
Interphase '4 in case of wiring. .

Since the pressure is 1/n, the low power consumption operation mode is entered. The first electronic circuit section 41 is the power supply control circuit 30
The above series of control states of 0 can be monitored by a control circuit state signal sent from the power supply control circuit 30G to the signal line 303.

When there is an access request again from the host device 100 in this state, the first electronic circuit section 41 immediately resets the power save signal on the signal 1s42 in order to enable normal operation. At this time, the power supply control circuit 300 turns on the electronic circuit power supply 10, outputs a power-on signal on the signal @31, and also connects the stator winding of the three-phase induction motor with the Δ/Y conversion circuit described above. Return to Δ connection and output motor drive power. After setting the installation to the initial state, the electronic circuit section 40 notifies the host device 1100 of the accessible state and begins normal operation.

(Effects of the Invention) As explained above, the present invention disconnects one power source for the electronic circuit of the second electronic circuit section that is not used for purposes other than normal operation by a power save signal from the first electronic circuit section. At the same time, the power save signal slightly reduces the characteristics such as torque and rotational fluctuation of the spindle motor, which is not required during normal operation, and by using it with delta connection during normal operation, it can be used as a head disk assembly. It is possible to operate the motor with a t-y connection that has a specified performance, making it possible to operate with low power consumption, and it is said that the power consumption is significantly reduced in information processing systems that require large-scale, large-capacity magnetic disk drives. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a magnetic disk device according to the present invention. Figure @2 is a block diagram showing an example of a conventional magnetic disk device. 2.--Main switch 10--Electronic circuit power supply 2a...Control power supply 30...Power control circuit 4G, 41.4i9...Electronic circuit section 60...Head disk assembly 100*... Host device go, soo...Motor 3.31.42, 46, 47, 101.303mmam
-Signal line 1.11.21.22.32.302...Fist...Power line

Claims (1)

[Claims] It is activated when the main switch is turned on, and is driven by a control power supply for obtaining first and second DC power outputs, and the first DC power output from the control power supply, and is driven by a host device. Detects a state in which there is no access that requires a series of operations such as continuous read/write for a certain period of time or a seek operation accompanying the read/write, and outputs a power save signal and monitors the control circuit status signal. A first electronic circuit unit operates together with a first electronic circuit unit for reporting a device status when there is a request from the higher level device to report the device status, and a first electronic circuit unit operates together with the first electronic circuit unit to perform reading/writing in response to a request from the higher level device. The second electronic circuit section for normal operations including writing and the start and end ends of the stator windings can all be pulled out to form a delta connection or a star connection, and the head disk a three-phase induction motor for driving a spindle of an assembly, and converting the three-phase induction motor into a delta connection when the power save signal is disabled and converting the three phase induction motor into a star connection when the power save signal is enabled; a delta/star conversion circuit for controlling the power supply, and a third DC power output from the control power supply, and a power supply control signal from the host device and a power save signal from the first electronic circuit section. In order to drive the second electronic circuit section, a power on/off signal for controlling power on/off for the electronic circuit is output, and is used together with the delta/star conversion circuit to control the operation of the motor. What is claimed is: 1. A magnetic disk drive comprising: a power supply control circuit for outputting a control circuit state signal indicating the series of control states;