JPS60200800A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To always apply the optimum reverse phase brake to a stepping motor even if a step rate is different by automatically varying a brake pattern in response to the step rate. CONSTITUTION:A stepping motor drive circuit 2 excites a stepping motor 1 on the basis of a step pulse. Step rate measuring means 3 measures an interval of step pulses, control means 4 set a brake pattern corresponding to the interval of the step pulses measured by the measuring means 3 to feed a reverse phase brake signal to the drive circuit 3 in accordance with the brake pattern and to apply a reverse phase brake to the motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tilt device 6 that moves a magnetic head using a stepping motor and applies anti-phase braking to the stepping motor.

A stepping motor is used as a drive source for a magnetic nod feeding mechanism in the flow and piti-sif apparatus.

However, with a stepping motor, when moving the magnetic head to a certain target track position on the magnetic disk, the first
As shown in the figure, a tamping phenomenon occurred and it took a long time (settling time) for the trunk to come to rest at the target trunk position. By shortening this settling time, it is possible to increase the data processing speed of the Flo7Btask system, but this can be done by suppressing the damping phenomenon, and one way to do this is to use a stepper motor with reverse phase
! ! There is a known method for applying I-movement.

In this method, as shown in Figure 2 in a stepping motor, if the excitation phase of each phase coil PHI to P114 is switched and the rotor is advanced one step to the next stable position, the rotor will overshoot to the next stable position. . Therefore, at timing t1, the excitation phase of each phase coil PHI to PH4 is returned by 7 to apply reverse A-port braking.

Then, when the rotor reaches the next stable position, the excitation phase of each phase coil PHI to PH4 is switched again to release the reverse phase braking and stop the rotor at the stable position (6).

The timing t1 and period t2 of the anti-phase braking are set to optimal timing and period depending on the amount of Gh of the head carrier etc. that holds the magnetic head, the speed of feeding the magnetic head, etc.

However, with a floppy disk device that uses this method, the mass of the carriage etc. does not change, but the magnetic
Since the speed of the deceleration varies depending on the specifications of the user who controls the Sudenoplate floppy disk device, there are multiple models with various braking timings and periods to suit each user's specifications. had to be prepared.

In addition, since the braking timing and period are fixed according to Stellar Play 1, if the step rate changes due to changes in the control method of the floppy disk device, effective 1ljl movement will not be applied to the stepping motor. .

The present invention automatically changes the braking pattern in accordance with the step rate in order to always apply optimal reverse phase braking to the stepping motor even if the step rate is different or changed. The purpose is to provide a magnetic tinuku device that applies braking.

While referring to the drawings below, please check the misfire F! Explain to J-1 ke details 1-(Do.

The structure of the present invention will be explained with reference to FIG. 3. In a magnetic tinook device 1q of a phronoptic device in which the movement of the magnetic head is carried out by a stepping motor 1 and a reverse phase braking force is applied to the stepping motor 1, The stepping motor drive circuit 2 excites the stepping motor 1 based on step pulses 68. Step rate #l' 1fl1 The means 3 sets the interval of the step pulses to @-t dll L, ((j101 means 4 sets the braking pattern corresponding to the interval of the Stellar play 1 measurement pulse, and sets the interval of the step pulses to this:l
In accordance with the motion pattern, a reverse phase braking signal is sent to the stepping motor and the ringing circuit 2 to cause the stepping motor 1 to perform reverse phase braking.

Next, a floppy disk device, which is one example of the present invention, will be explained. In this floppy disk device, a stepping motor is used as a drive source for a magnetic head feeding mechanism. The magnetic head is held by a dog carriage that can move in the radial direction of the magnetic disk.
The head carrier is connected to the output 4q11 of the stepping motor through a steel bell, so that it moves in the radial direction of the magnetic disk as the stepping motor rotates. bl. This floppy disk device is external! l;II (All steps and layer numbers are manually input from the 10th stage. This step signal is 1 pulse manually inputted.
``& Cut the excitation phase of each phase coil of the stepping motor through l:); One truck at a time is sent to the desired destination.

Figure 4 shows a circuit for opening the pins 2 and 7 in response to a signal sent from an external opening means in this floppy disk device, and Figure 5 is its timing chart. be.

Main 1b control unit 1], random access memory (RAI
VI)] 2. Read only memory (ROM)
13, human power section 14, output section 15 and timer 16-1
89 constitutes computer 19, main) 11U @ 1 part"
1 reads out and executes the program as shown in FIG. 6 stored in the program memory 20 in the R2M17. That is, Lord: l; II Ogoribe 11
When the power is turned on with Mako's flow and Petesfu installed, ■ Reverse phase braking Butter Tsunomori 21) Updated 1 ; 1u
Timing of ill movement '1'', Reverse Al-I1: Marking pattern tl of ill movement.

Read out 12 pieces and reverse) lrl il river pattern set, [
・Set part 22, 1. Here, when moving magnetically, from the first step pulse to the next step pulse (i step rotation - 1 - (SR) is unknown, so apply reverse phase braking to the stepping motor using the standard movement pattern. It's like begging.

■ The step signal a (see j1 in Fig. 5) and the rotation direction signal or the manual input from the external hjll H1 means via the input section 14. Then, the timer 16 for SR (Stella Play-1) and the timer 7 for reverse 4'' A!tilJ movement timing T+ are started. At the same time, the output section 15
&Q' Excite the stepper drive coil 24 (PHI to PH4) of the stepping motor through the driver circuit 23 (n7ILl in the direction indicated by the above rotation direction symbol 1)
] a゛mel. As a result, the stepping motor advances one step and the magnetic head attempts to move by 11 racks, or the stepping motor continues as it is.
, timer] 7 is the reverse phase braking pattern set, 1/part 22 reverse Δ mouth 11 river! 1 side timing 1. 7', [Overflow (OVIi') L /Here, output section 15
And, via the driver circuit 23, the excitation phase of the stepper and drive coil 24 is returned by one, and the original phase is reversed! 1
Apply rll motion. This and timer 18 for T2 at P1
Let's start. Timer 18 for 1゛2 or reverse AI braking pattern set, reverse phase 1iU movement in part 22 ≠ axis l t
i41 t 2 and overflows/Then, the excitation position A of the stepper drive coil 24 is again moved through the output section 15 and the driver circuit 23 to advance one step in the direction indicated by the rotation direction signal and reverse a. fljl" is turned off.

■ When the next step signal (signal 1) (see Figure 5) is inputted from the outside (input section from jJ1 means), the SR timer 16 is stopped by 1. Let it be (jti (SR1lillll fli ¥1)
The value is set to 1 in the SR timer value storage section 25 in the RAlv 112. At the same time, the SR timer 16 and Tl
The 17 timers are restarted and the output section 15
The excitation phase of the stepper drive coil 24 is further advanced by j steps via the driver circuit 23. And SR monthly 1 timer fly memory 'Ml's 25 pages 1.0sat
+ /L S', L fllM vs. 1+
'c: Braking timing of the reverse A-eye control pattern 1, that is, the optimal reverse phase braking pattern '1 and! 1rll
Dynamic period T2 For example, t, q, 'I-4 request reverse i old 111'
Select and read from the dynamic Bakun memory 21 Reverse 41-
1::Set the ill movement pattern to 7-i-8B22. Here, the reverse phase braking pattern memory 21 contains seven reverse phase braking patterns as shown in the following table.

The SR value stored in the SR timer value storage section 25 is 6~
If it is 8 ms, the second pattern 13.1. .

i3' oozes out and reverse N+-11ull motion pattern set,
l' The ir bracket 22 will be set to 1. As a result, '1゛1 tie 7-170J) 0VIj'' i direct 'Y1+ is changed to t3 and T2 timer 18 ov
Change F clay from 12 to 14, Tl = t3. T2 =
14 To L Tel: Record ■Niokel ■Repeat the actions after A J-0 ■ From then on, S 11< or 13 + 14
Perform anti-phase 1fjII motion with the anti-phase braking pattern.

(Φ When the UFJ reaches the target track device and the step signal stops, the ovir of the SR timer 16
]υ (Return to state Fits. SR timer) The 6th OVF 1171 should be longer than the currently used SR value. -4 - That is, the 1 currently used 5R - 1 trace' 3rn s~20TllS 2) Therefore, the 0Vl-' value of the -1 timer J6 (i25~3(1
It should be set to ms.

(・ 6b qi, 1. Gogiyame image track θ11 noodle) Each time you move it, repeat the above ■～(no action?).

As described above, according to the present invention, h is magnetically moved by a stepping motor to apply reverse phase braking to the stepping motor (I μ air Fisk device; at t, 1 ift of the step pulse is applied). After learning the interval, set a 1lill movement pattern corresponding to that interval!t;t] In the movement pattern, 'vL is reverse phase 11□1
Since the motion is applied to the stepping motor, even if the user's specifications are different and the steno plate is changed to 1/A, or the steno plate is changed due to a change in the control method of the magnetic tisf device, etc. Applying optimal anti-phase braking to the Stella pin lid and adjusting the settling time of the magnetic head makes it possible to use DF for any stenopt! 1jtl
1i141 means.

[Brief explanation of the drawing]

Figure 2 is a waveform diagram showing the tanobi phenomenon of the floppy disk device in the conventional floppy disk device a. 31-1 is a flow diagram showing part of Ming's configuration, Figure 4 is a flow diagram showing a part of Ming's configuration; Stepping motor control circuit timing chart, Figure 6 Stepping motor 1lilJ m1
This is the flownayat shown by the circuit l111th 11]j progera. DESCRIPTION OF SYMBOLS 1...Stenoch motor, 2... Stitch router drive circuit, 3... Step rate=-t flil1 means...Hill round means. Change of agent Kabayama % 1 Figure °C Figure 5 A Figure L-111 J Figure 5

Claims (1)

[Claims] A magnetic TiSF device in which a magnetic head is moved by a stepping motor and reverse A-eye braking is applied to the stepping motor includes a stepping motor drive circuit that excites the stepping motor based on a step pulse; It corresponds to the step pulse interval measured by the step pulse measuring means for measuring the interval and the step pulse measuring means 11111 for measuring the interval. Set a till movement pattern and send a negative phase braking signal to the stepping motor drive circuit according to this I11 movement pattern! A magnetic tisf device comprising a ti control means and a ti control means.