JPH03145997A - Motor drive controller for magnetic record reproducing unit - Google Patents

Abstract

PURPOSE:To stabilize the motion of carriage in short time by generating a phase exciting signal for cancelling the vibration of the carriage in the seeking direction if no step pulse is received even upon elapse of predetermined step pulse interval. CONSTITUTION:A control circuit 13 judges that a carriage stopped if next step pulse/SP is not received even upon elapse of predetermined step pulse time interval, and generates a control pulse(phase exciting signal PH1) for cancelling the second and following peaks of vibration with a timing longer than the step pulse interval. The phase exciting pulse signal PH1 interferes with the original vibration wave to cancel the original vibration when the motion of the carriage stops. By such arrangement, motion of the carriage can be stabilized in short time.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic recorder such as a floppy disk device,
A: This invention relates to a motor drive control device for a reproducing device.

(Prior Art) Conventionally, for example, in a floppy disk device, a stepping motor is used as a drive source for a carriage, and the carriage is moved in the radial direction of a recording medium by driving the stepping motor. Here, for example, when a two-phase excitation type stepping motor is used, two phase excitation signals PHI and PH2 are switched by receiving a step pulse SP from the host device.
The stepping motor is driven by changing the direction of the current flowing through the stepping motor coil.

Figure 3 shows the conventional motor drive signal (SPSPHI).

FIG. 2 is a diagram showing the relationship between PH2) and displacement of the carriage.

In this example, two pulses move the carriage one track. That is, the step pulse SP from the host device
When received, first, the phase excitation signal PH1 is switched to advance the carriage one step, and then the phase excitation signal PH2 is switched at a predetermined excitation timing to advance the carriage two steps. At this time, the displacement of the carriage is as shown in FIG.

(Problem to be Solved by the Invention) By the way, when the carriage is moved by driving such a stepping motor, the carriage stops moving.
! At I, a vibration component as shown in FIG. 3 remains. For this reason, conventionally, there was a problem that it took time for the carriage to stabilize at the final stop position, resulting in a long settling time.

The present invention has been made in view of the above points, and when a stepping motor is used as a carriage drive source, it suppresses the vibration component that remains when the carriage stops moving, stabilizes the carriage in a short time, and achieves settling. It is an object of the present invention to provide a motor drive control device for a magnetic recording/reproducing device that can shorten the time.

[Structure of the Invention] (Means for Solving the Problems) That is, the present invention switches the phase excitation signal of the stepping motor, which is the drive source of the carriage, by receiving a step pulse from the host device, thereby causing the stepping motor to operate. A motor drive control device for a magnetic recording/reproducing device that drives a magnetic recording/reproducing device, wherein the motor drive control device cancels the vibration of the carriage in the seek direction when the step pulse is not received even after a predetermined step pulse interval has elapsed. It is designed to generate a signal.

(Function) According to the above configuration, when the carriage stops moving,
A phase excitation signal is generated that cancels vibrations of the carriage in the seek direction. By generating this phase excitation signal, the vibration waveform caused by the same signal and the original vibration waveform interfere with each other, and their vibration components are canceled out. Thereby, the carriage can be stabilized in a short time and the settling time can be shortened.

(Embodiment) Hereinafter, a motor drive control device for a magnetic recording/reproducing device according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, for example, a floppy disk device includes a host device 11 and a floppy disk drive (
(hereinafter referred to as FDD).

FDD I2 is the control circuit 13, motor drive circuit 1
4 and a stepping motor 15.

The control circuit 13 controls the FDDI 2, and receives the step pulse SP transferred from the host device FLll to output Flj excitation signals PH1, PH2 to the motor drive circuit 14.
The stepping motor 1 is driven through this motor drive circuit 14.
Drive 5. The motor drive circuit 14 is a phase excitation No. 16 P
A current is applied to the coil of the stepping motor I5 based on HI and PH2. The stepping motor 15 is a drive source for a carriage (not shown), and is a two-phase excitation type motor here.

Next, the operation of this embodiment will be explained with reference to FIG.

Figure 2 shows motor drive signals (SP, PH1).

FIG. 2 is a diagram showing the relationship between PH2) and carriage displacement. F
When the control circuit 13 in the DDI 2 receives the step pulse SP from the host device 11, it outputs phase excitation signals PHI,
The stepping motor 15 is driven through the motor drive circuit 14 while switching PH2 at a predetermined excitation timing.

At this time, the control circuit 13 monitors the reception interval of the step pulse SP. Here, if the next step pulse SP is not received even after a predetermined step pulse interval T time elapses, the control circuit 13 controls the carriage movement stop +h
As shown in Fig. 2, a control pulse (in this case, phase excitation signal PH1) is generated to cancel the second and subsequent vibration peaks at a timing Tc that is longer than the step pulse interval T. .

Due to the generation of this control pulse (phase excitation signal PH1), when the carriage stops moving, the vibration waveform caused by this pulse and the original vibration waveform interfere with each other, canceling out the vibration components, as shown in Figure 2. Ru. This results in
The carriage can be stabilized in a short time. In this case, by canceling out the second and subsequent vibration peaks rather than the first vibration peak near the step pulse interval, the settling time can be shortened without affecting the characteristics of continuous seek. be able to.

Note that the output timing of the control pulse and its special pulse length when the step pulse interval T changes are determined by the control F.
It is assumed that the il path is stored internally in one path and three times, and can be changed at will according to the step pulse interval T.

[Effects of the Invention] As described above, according to the present invention, when a stepping motor is used as a carriage drive source, it is possible to suppress vibration components that remain when the carriage stops moving. Therefore, the carriage can be stabilized in a short time and the settling time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a floppy disk device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between a motor drive signal and carriage displacement in an embodiment, and FIG. 3 is a diagram showing a conventional motor. Drive (It is a diagram showing the relationship between No. 4 and carriage displacement. 11... Host device, 12... FDD (floppy disk drive) 13... Control circuit, 14... Motor drive circuit, 15...Stepping motor.

Claims (1)

[Scope of Claims] A motor drive control device for a magnetic recording and reproducing device that receives step pulses from a host device to switch a phase excitation signal of a stepping motor, which is a drive source of a carriage, to drive the stepping motor. A motor of a magnetic recording and reproducing device, characterized in that, when the step pulse is not received even after a predetermined step pulse interval time has elapsed, a phase excitation signal that cancels the vibration of the carriage in the seek direction is generated. Drive control device.