JPS60144160A - Drive control circuit for stepping motor - Google Patents

Abstract

PURPOSE:To shorten the rising time at the start initiating time and to shorten an access time by providing a non-volatile fixed memory circuit for storing step pulse rate data. CONSTITUTION:A controller 1 inputs data from a nonvolatile fixed memory circuit ROM9, and sequentially flows currents to a STM coil corresponding to a drive circuit 2 on the basis of the data. A step pulse applied from the controller 1 to a drive circuit 2 is a step pulse rate data as shown in waveform drawing (A). The supply of several pulse step pulses is delayed at approx. 2/3 time point when arriving at the highest speed after initiating the start, and a step pulse is supplied at the prescribed interval. The rotary torque of the rotor tends to be cancelled by the displacement of the designation speed 1' to the rotor and the actual speed 2' of the rotor, but the rotary torque is efficiently multiplied by the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an apparatus for controlling the movement of a drive motor of a head positioner using step pulses.

In particular, the present invention relates to a drive control method during startup of a stepping motor.

(b) Background of the technology In order to record/reproduce information on a rotary recording medium such as a magnetic disk drive, a seek process involves moving a head positioner equipped with a head to position the head at a target position on the rotary recording medium. Action is required.

As a head positioner, a voice coil type linear motor, a rotary voice coil motor fixed to an arm arranged to freely rotate around a rotating shaft, a DC servo motor, etc. are often used.

Furthermore, it is necessary to position the head at a target position at high speed and with high precision, so there is a high-speed positioning control section in which the head positioner is moved at high speed.

Control is performed separately in a precision positioning control section in which the conditions from the above section are taken over to position the head positioner at the target position with high precision.

When driving a mechanical motor using an electrical signal as described above, an important point is control of when the motor starts and stops. It is desired to develop a technique that efficiently combines the step pulse supply timing and the actual operation of the motor in order to position the head positioner at the target position at high speed and with high precision.

(C) A conventional drive control method for a hemlock body using a stepper motor will be described with reference to one drawing.

Figure 1 shows a conventional stepping motor drive control circuit.
(A) is a circuit configuration diagram, (B) is a stepping motor configuration diagram, FIG. 2 is a characteristic diagram of FIG. 1, (A) is a step pulse rate diagram, and (B) is a speed characteristic diagram.

In the figure, 1 is a control circuit, 2 is a drive circuit, and 3 is a stepping motor (hereinafter abbreviated as 5TVI).

4 to 7 are 37M coils, and 8 is a rotor.

Note that ■ indicates the reference speed of the rotor 8, and ■ indicates the actual speed of the rotor 8, respectively.

The conventional motor drive control method creates step pulse pulse rate data (a pulse train arranged with a predetermined interval between pulses) based on the characteristics of 57M3, and supplies the data to the control circuit 1 to control the drive circuit. The drive current is sequentially applied to the STM coils (4 to 7) via 2, and the rotor 8
Rotate. However, a difference occurs between the reference speed (2) characteristic of the rotor 8 and the actual speed (2) characteristic of the rotor 8 due to the given step pulse, as shown in FIG. 2(B).

This is because there is a limit to the rotational speed of the rotor 8 at startup.

On the other hand, in order to rotate the 57M3 at high speed, a considerable starting torque is required, and the step pulse rate data is determined mainly based on conditions such as this starting torque. There was a drawback that there was a difference between the actual speed and characteristics of 8, making it difficult to control the rotation efficiently.

(d) Object of the Invention The object of the present invention is to provide a new stepping motor drive control circuit that eliminates the above-mentioned drawbacks, and in particular aims to shorten the start-up time when starting the stepping motor, and to reduce the access time of the head positioner. The object of this invention is to realize a stepping motor drive control circuit that can shorten the time.

<e> Structure of the Invention The present invention controls the movement of a head positioner that performs a gutter positioning operation to a target position on a one-rotation type recording medium using a step pulse, and the movement control is a high-speed control that moves at a high speed. A stepping motor drive control circuit that performs precision control for positioning to the target position with high precision,
A first means for controlling a stepping motor using predetermined data contained therein; and a second means for driving the stepping motor using control data from the first means; By synchronizing the control data output to the means with the actual operation of the stepping motor, the rotation time at the time of starting the stepping motor is shortened, and the access time of the forward positioner is shortened. This can be achieved by a stepping motor drive control circuit.

(f) Examples of the invention The present invention will be explained below with reference to the drawings.

FIG. 3 shows an embodiment of the stepping motor drive control circuit according to the present invention, and FIG. 4 is a characteristic diagram of FIG. 3.

(A,) is a step pulse rate diagram according to the present invention.

(B) shows the indicated speed/actual speed characteristics of the rotor 8, respectively.

In the figure, 9 indicates a nonvolatile fixed memory circuit (ROl). The same symbols as in Figures 1 and 2 indicate the same content,
■' indicates the speed instructed to the rotor 8, and ■' indicates the actual speed of the rotor 8, respectively.

In this embodiment, the control circuit 1.controls the drive of the 57M3 via the drive circuit 2 based on data from a front-end circuit (not shown) and a non-volatile fixed memory circuit (ROM) 9. ? According to instructions from IJI control circuit 1, each 37M coil (4
~7) Drive circuit 2, which sends drive current to 37M coil (4
57M coils (4 to 7), 57M coils (4 to 7) and 57M coils (4 to 7), which rotate the rotor 8 with the drive current from the drive circuit 2; The rotor 8 rotates by the magnetic poles created in steps 4 to 7), and the nonvolatile fixed memory circuit (ROM) that stores step pulse rate data.
It consists of 9.

Next, the operation of this embodiment will be explained.

In response to a seek operation instruction, the control device 1 takes in data from a front circuit (not shown) and a non-volatile fixed memory circuit (ROM) 9, and these data are also sent to the 57M coils (4 to 7) corresponding to the plow drive circuit 2. Control is performed so that the drive current is applied sequentially to the The drive circuit 2 supplies a drive current to the corresponding 57M coils (4 to 7) according to instructions from the control device 1, creates magnetic poles, rotates the rotor 8, and starts activating the 57M3.

The step pulse given from the control device 1 to the drive circuit 2 at the start of startup is step pulse rate data as shown in FIG. 4(A). The supply of step pulses is delayed by one pulse or several pulses at about 2/3 of the time when the maximum speed is reached after the start of startup (this time is the time with the least time loss, but this can be varied depending on the situation).2 Thereafter, step pulses are supplied at regular intervals. With this control, the rotational torque of the rotor 8 tends to be canceled out due to the discrepancy between the instructed speed ■' to the rotor 8 and the actual speed ■' of the rotor 8, but now the rotational torque is efficiently applied to the rotor 8. This makes it possible to make the rise of the command speed (■') to the rotor 8 more steep.

(g) Effects of the Invention According to the present invention as described above, it is possible to provide a stepping motor drive control circuit that can shorten the startup time of the stepping motor and reduce the access time of the head positioner. .

[Brief explanation of drawings]

Figure 1 shows a conventional stamping motor drive control circuit;
The figure is a characteristic diagram of FIG. 1, and FIG. 3 is an embodiment of the stepping motor drive control circuit according to the present invention. FIG. 4 shows the characteristic diagrams of FIG. 3, respectively. In the figure, 1 is a control circuit, 2 is a drive circuit, and 3 is an STM
, 4 to 7 are 57M coils, 8 is a rotor, and 9 is a nonvolatile fixed memory circuit (ROM). Tower 1 Town Dormitory 2 2 Gaku 3 Shoken 4 @ (/41

Claims (1)

[Claims] The movement of a head positioner that performs a head positioning operation to a target position on a rotary recording medium is controlled by step pulses, and the movement control includes high-speed control to move at high speed and precision control to position the head to the target position with high precision. A stepping motor drive control circuit for controlling a stepping motor using predetermined data;
a second means for driving the stepping motor by control data from the first means;
A stepping motor drive control circuit characterized in that control data output to the means is synchronized with the actual operation of the stepping motor.