JPH02155488A - Drive for motor - Google Patents

Abstract

PURPOSE:To start a motor efficiently by storing the last stop position of the motor in a storage circuit and selecting and energizing a proper motor winding in accordance to the contents of the storage circuit for the next operation. CONSTITUTION:A storage circuit 4 for storing the last stop position of a motor is installed into a revolution controller 1. When a magnetic disc drive is energized or the revolution controller 1 receives, a speed control signal A a spindle motor 3 starts. A winding to be energized in the assigned direction of rotation is selected in accordance with the last stop positions of the windings of the spindle motor 3 stored in the storage circuit 4 mounted into the revolution controller 1 at that time. Currents are made to flow through the winding selected by the revolution controller 1 through an amplifier 2, thus efficiently starting the motor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a motor drive device, and particularly to a drive device for a spindle motor provided in a magnetic disk device.

(Prior Art) A drive device for a spindle motor provided in a magnetic disk device and for rotationally driving a magnetic disk has conventionally been configured as shown in FIG. 2. In the figure, numeral 1 is a rotation controller, numeral @2 is an amplifier, and numeral 3 is a spindle motor. Usually, the spindle motor 3 does not have a phase detection sensor such as a Hall element shown in white. When the spindle motor 3 is driven by the conventional motor drive device configured in this way, when the power is turned on to the magnetic disk Vicm or the speed control signal A is input to the rotation controller 1, it is synchronized with these. Then, the spindle motor 3 starts rotating. At this time, the rotation controller 1 can detect the position of the winding in the motor 3 using induced voltage, etc.
The windings within the motor 3 are arbitrarily selected, and the windings within the motor 3 are energized via the amplifier 2, thereby driving the motor 3. FIG. 3 shows an example of induced voltage waveforms induced in each phase U, V, and W when the three-phase motor rotates.

However, according to the above-mentioned motor drive device, since an arbitrary winding is selected when starting the spindle motor 3, the phase of this winding may be inappropriate with respect to the rotation direction.
This has the problem of not being able to start up efficiently because it cannot be determined until it has been started.

(Problem to be Solved by the Invention) As mentioned above, with the conventional motor drive device, the rotation controller selects an arbitrary winding of the motor, so there is a problem in that the motor cannot be started efficiently when starting. .

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a motor drive device that can efficiently drive a motor in a specified rotational direction when starting the motor.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a motor drive device for a magnetic disk Vt, which includes a rotation controller, an amplifier, and a spindle motor. The motor is characterized by being equipped with a memory circuit for storing the final stop position of the motor.

(Function) According to the above configuration, the last motor final stop position is stored in the memory circuit, and when the motor is started next time, the windings in the motor are selected and energized according to the contents stored in the memory circuit, thereby improving efficiency. A good start-up can be performed.

(Example) Hereinafter, an example of a motor drive device according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, parts that are the same or equivalent to those of the conventional example shown in FIG. 2 are designated by the same reference numerals, and their explanation will be omitted. The feature of this embodiment is that a memory circuit 4 stores the last motor final stop position in the rotation controller 1.
The other configuration is the same as the conventional example shown in FIG. 2.

Next, the operation of this embodiment will be explained. In FIG. 1, when the magnetic disk device is powered on or the rotation controller 1
When speed control signal A is input to , the spindle motor 3 starts rotating in synchronization with these signals. At this time, the winding to be energized in the specified rotation direction can be easily selected based on the last final stop position of the winding of the spindle motor 3 stored in the memory circuit 4 provided in the rotation controller 1. By passing current through the winding selected by the rotation controller 1 through the amplifier 2, the motor 3 can be started efficiently.

According to this embodiment, when the motor 3 is started, it is possible to energize the appropriate windings to start rotation in the specified rotation direction, and the efficiency and safety of motor drive can be improved with a simple configuration. .

In the above embodiment, a spindle motor drive device provided in a magnetic disk drive has been described, but the same effect can be obtained even if the present invention is applied to a motor drive device that does not have a built-in position detection sensor.

[Effects of the Invention] As explained above, according to the present invention, since the rotation controller of the motor drive device is provided with a memory circuit for storing the final stop position of the motor, the motor can be efficiently rotated in a specified direction of rotation when starting the motor. It can be driven and safety can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a motor drive device according to the present invention, FIG. 2 is a block diagram showing the configuration of a conventional motor drive device, and FIG. 3 is a block diagram showing the configuration of a conventional motor drive device. It is a graph which shows the induced voltage waveform induced in each phase. 1... Rotation controller 2... Amplifier 3...
Spindle motor 4...Memory circuit agent Patent attorney Nori Chika Ken Shu Kanshu Yamashita

Claims (1)

[Claims] 1. A motor drive device for a magnetic disk device comprising a rotation controller, an amplifier, and a spindle motor, characterized in that the rotation controller is provided with a memory circuit for storing a final stop position of the motor.