JPS58116098A - Detecting and controlling device for driving timing of stepping motor for clock - Google Patents

Abstract

PURPOSE:To economize driving and consumed currents, and to increase the speed of continuous rapid-feed of a pointer by applying the next driving pulses at timing capable of effectively utilizing the energy of damped oscillation of a rotor just after the stepping motor is driven by one step. CONSTITUTION:The stepping motor consists of a stator 1, a coil 2 and the rotor 3. When the pointer is rapidly fed continuously, driving timing capable of effectively utilizing the surplus of the kinetic energy of the stepping motor for driving the next step without consuming the surplus for the damped oscillation of the rotor 3 is detected from reversely induced currents by the damped oscillation of the rotor 3, and driving pulse signals supplied to the coil 2 are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a step motor for an electronic wristwatch having two rotors, an integrated stator, and a coil. The present invention relates to a drive timing detection and control device for a timepiece step motor, which effectively utilizes the timing to drive the next step.

FIG. 1 shows a two-pole step motor for electronic wristwatches that has been conventionally used and is also used in the present invention.

FIG. 2 is a timing chart of conventional drive pulses used to drive a step motor of this structure. Figure 2 (a), (b) signals are normally (o
) = ((1) Signal is (・) when BLD is activated)
The signal (g), &) is the driving signal at 9 o'clock in reverse fast forwarding, and the (g) and &) signals are driving signals at 9 o'clock in reverse fast forwarding.

Figure 2 (a), (b) K with the drive pulses shown, 1
In the case of a step motor that is driven step by step every second, the remaining drive energy after driving one step is consumed as damped vibration until the rotor S in FIG. 1 comes to a standstill.

This damped vibration ends at around 100 mm and does not affect the next step drive after 1 second.

However, when a continuous drive circuit of the step motor is required, such as during two-step continuous drive when the BLD/Battery life end notification device is activated, or during forward and reverse fast forwarding for electronic needle correction, the interval between each step drive is short. Therefore, since the next drive pulse is applied to the song in which the damped vibration of the rotor 3 ends immediately after the one-step drive, the damped vibration may have an influence on the next step. The manner of this influence differs depending on the phase of the damped vibration when the next drive pulse is applied.

If the next drive pulse difference 1 is applied to the phase in which the rotor 5 is moving in the forward rotation direction due to damped vibration in normal rotation drive, the energy of the damped vibration will be added to the next drive energy.
l If qK is applied in a phase in which the rotor S is moving in the reverse direction, the next drive energy will be destroyed by the energy of the damped vibration. In the latter case, a phenomenon such as a 2-second skip occurs and the rotor 5 does not rotate due to insufficient drive energy.

In the case of the conventional step-by-step continuous drive 4I, the distance between each drive pulse is widened so that when the amplitude of the damped vibration of the rotor 5 becomes sufficiently small, the ninth drive pulse is applied. In this way, the effects of the two types of damped vibrations mentioned above are reduced. However, this has the disadvantage that it takes a long time to correct the needle. Furthermore, since the next drive is performed after the damped vibration energy of the rotor 3 has become sufficiently small, the remaining drive energy is mostly consumed by the damped vibration of the rotor 5, which is also a waste of drive current consumption. Ta.

The present invention eliminates such drawbacks, and when the step motor is caused to rotate continuously, the next drive pulse is applied at a timing when the energy of the damped vibration of the rotor 5 immediately after driving one step can be effectively utilized. This aims to save drive current consumption and increase the speed of continuous rapid forward movement of the pointer.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

First, let us consider the forward rotation drive ll1hvcxv, in which the rotation angle # of the rotor 3 in FIG. 1 changes from 0 to π. Figure 5 (4
) shows the motion of A-Y5 during this one-step drive.

Figure w4s (to) is the waveform of the current flowing through the coil 2 in Figure 1 at that time. 0 (1 (1,) indicates that the drive pulse is being applied, and the current corresponds to the drive current.

t, 1>1. At this time, the current is caused almost only by the movement of the rotor 3 and is a reverse induced current. Figure 5 (A)K
If we look at the motion of the rotor 3 when 1:>11, it can be seen that there is a damped vibration t.

Here, the direction of motion of the rotor 5 due to damped vibration is the forward rotation direction, and the timings of maximum interlocking are 8 and 9 in FIG.
It is. At this time, the child induced current value reaches its peak value. If this reverse induced current can be detected in some way, the energy of the damped vibration can be utilized by applying the next drive pulse almost immediately after it.@In the case of continuous fast forwarding, this detection and control t5 each step HA11J* go to゛I will explain according to the timing chart.

FIG. 4 is a timing chart of drive timing detection control during BLD operation. 4th v! J(1) is a two-step sequence s]I! The first voltage signal of 1 is applied to the voltage t at the terminals Os II of the coil 2 in FIG. No. 41)
is the current waveform t at this time, and the voltage waveform is chopper-amplified only in the direction where the damped vibration energy can be effectively used for the next drive. Here, the chopper width is increased by alternating the closed circuit of the low impedance element and coil 3 and the closed circuit of the high impedance element and coil 5, thereby increasing the current flowing through the coil 3 as a voltage. Tell me how to do it.

An interesting method of increasing the brim width will be described in the description of the drive circuit after 1. This chopper amplified voltage tco/parator detects 6, and then j'm is adjusted by adjusting the optimum drive timing.
After the soft delay, the next drive pulse is applied to terminal 0 of the t coil 5.
111. Here, the detection period is 200 m from the end of application of the drive pulse.・The detection period of ξ is the period in which the declination angle n shown by the dotted line in FIG. .

By performing the above detection control every 92 seconds starting from 1 step, the damped vibration energy can be used for the next drive without wasting it, and it can be output after the pair of 2 steps. The width of the next drive pulse can be shortened. (iv) The required drive pulse width tθ of the tlia signal (j) is reduced by Δ·. This makes it possible to save driving current consumption during BLD operation. If the ef rotor 30 attenuation becomes small due to a sudden factor and becomes undetectable, the next drive pulse will not be applied.
! ! Control is such that the next drive pulse is forcibly applied to peaks of 00 mm and below.

The process of detection control during forward rotation and fast forwarding of needle correction is basically the same as the BLD operation operation cylinder described above, but the terminal 0 of coil 3! The difference is that both the application of drive pulses to the side and the application of drive pulses to the back side require more than one repetition of detection control circuits. Timing chart in this case) 11115 Figure 7
P.S. #I5Yuuni) is the start pulse signal for normal rotation fast forwarding, and Figure WA5 (B) is the current waveform of that curve.
N5 diagram (0) is a voltage waveform with the current waveform 1+w brim widened. The signal n indicated by the dotted line in FIG. 5(o) is detected within the interval of HL and a'! El
The next drive pulse applied after a delay of sec is all!
511Nφ) n1 required drive pulse width Y @ ! E
Only Δefflsec can be summarized from lsee. The above detection control t1 in FIG. 5 is repeated as shown in (q), (r) and (S,). As described above, in step 9, it is possible to reduce the required drive pulse width by Δe from all other S・ except for the fast-forward start pulse width, % BL
Driving consumption can be reduced by 111N 1l-NJ like the D-operation cylinder.

Next, FIG. 6 shows a timing chart when the hand correction is reversed and fast forwarded at 9 o'clock.

First, in the case of reverse drive, one step drive is shown in Fig. 6 (1
) and (u) three types of drive pulses given by signals are applied sequentially. This nFi, rotor 3'9 with the first two pulses of the ant
This is a system in which the rotor 3 is forcibly vibrated to give it a force in the opposite direction, and then a $5 reversing section that rotates in the opposite direction emits a force pulse.

This method has traditionally been necessary for I/Cs that drive step motors in reverse, which normally function as normal rotations. Next, FIG. 6(v) is the electric R waveform, ←) is the current chopper amplification voltage waveform, and the signal n shown by the dotted line in ←) is H.
The interval l is the detection interval. Optimum drive timing t is detected from this chopper amplification voltage, and W46 (X) and (y
) Two types of next drive pulses 14. do. This makes it possible to utilize the damped vibration of the rotor 3 and reduce the energy of forced vibration required for reverse rotation. One box p1
Of the five drive pulse widths f'@gI, h/, which are required for the originally reverse rotation section indicated by (1,) and (Q) in Fig. 6, f
'w can be eliminated, and g' can be reduced by Δg'. From the above, driving current consumption can be saved.

Now, the step motor is slow! The drive tying detection and control method for effectively utilizing the damped vibration energy of the rotor 3 in various cases of rotation has been described according to the tying chart. Hereinafter, the detection control circuit and drive @ path in normal rotation fast forward p# of needle correction, which is a typical example of causing the step motor to continuously rotate t, will be explained in detail.

11I47Y is a detection control circuit for normal rotation and fast forwarding at 9 o'clock.

Starting with detection, the input terminal OK%lI5 in Figure 7 (
Input the signal n shown in 11). (-3) The signal remains at HlKl only at the moment of the rising edge of the drive pulse. The period from when this (-1) signal becomes HlK to when it is detected is the detectable period. However, in order to save current consumption for detection, the detection interval is set so that fKtj does not exceed 200 m5Ilc. This function is achieved by inputting the signal n shown at the input terminal OK in FIG. 7 and FIG. 5 (B1). At the time of detection, first, the chopper amplified voltage on the terminal 08 side of the coil 3 is inputted from @7O, and the chopper amplified voltage on the t01 side is inputted from FIG. 70. That is, n is detected by comparators 0 and 0, and a detection signal is output from n, O, and 0.

After that, this detection signal passes through the 00(1'm delayed grinding (2) path, so it becomes a signal delayed by (1'mm)*(1'
mMt slow fII'f! Become J. Immediately after the signal with a delay of 6' m, the pulse width (,/-Δ
e' 3 mm k construction, from terminal [phase] and @ (4
The drive signal -j1 of 11-Δ·')rnw is alternately output. Here, let us explain in more detail the mmk that outputs the drive signal of (g'-Δ・']11ase. First, the color/return signal is 1llj811T with the detection delay signal 0, and then (,/-Δe' )mm, an output signal is output from QX.With this signal, 81!IT-R181T-ytxp-F
LoPOsO*O is RII311iT. 0 has been 8ETed in advance with the detection delay signal 0, so from the output Q of
J comes out. This signal is BIT-RMgMT-FL engineering P
-F I, OPO and [phase] divided into 19189 n
, the aim signal is alternately output from terminals 0 and 0. Here, the timing of detecting the damped vibration of the rotor 5 is determined by the direction of the induced current. Therefore, after the drive signal is output from terminal 0, the detection signal is input only from 0, and the drive flaw'@ is output from the terminal [phase] as shown in n;b, and the detection signal is output only from [phase]. Set up the power so that it is input. This machine II@ has a terminal oVC
In Fig. 5 (8-Regular-fi!W: Input KL by mistake.Also, if the p-damped vibration becomes too small to be detected due to an unexpected factor, drive) (Russ will not appear next time, so after SQOmsw
Step 9 is accomplished by inputting the signal shown in Figure 45 (B1), tyt, and inputting the signal shown in Figure 5 (@@) to the terminal @.

The above is an explanation of the detection control circuit during normal rotation fast forwarding.Next, the drive circuit during normal rotation fast forwarding will be explained according to the timing chart of FIG. 8 and the circuit of FIG. 9.

First, 10 and 11 in the tJ48 diagram are 6' m from the time of detection.
It is after 5ae, and it is the moment of the next drive. Signals (1g) and (C8) in Fig. 8 are drive pulse signals output from 00 and 0 in Fig. 7, respectively, but these signals (1g) and (C8) are input to the terminals O and 0 in Fig. 9. Then, the 0□, O, and K drive pulses of the coil 5 are applied.

After applying the driving pulse, (a,) and (d) of the %$l'lB diagram
l) Signal t, so-n-tl'n input to terminals 0 and 0 in Figure 9;
ll) When inputting terminal 0 and OK large in the figure, L9 performs the above-mentioned chip width increase. By increasing the chopper width, the induced current due to the damped vibration of the rotor 3 is amplified as a voltage, which is detected by the detection circuit shown in FIG.

The drive timing detection system # in normal rotation fast forwarding 9Q for hand correction, which is a typical example of the present invention, has been described above using a specific circuit.

In this way, the present invention can be used in various cases where the step motor is made to rotate continuously, such as when rapidly moving a pointer.
Energy of damped vibration [effectively fF! 1, it is possible to reduce the drive current consumption of the step motor, and moreover, it is possible to replace the conventional method of rapid coal feeding with the pointer.

[Brief explanation of the drawing]

Figure 1 shows a two-pole step motor for electronic wristwatches that has been used conventionally, and the present invention has 411! Figure 2: Conventional drive, <Rus timing f-?-)% Figure !S is a graph showing the relationship between rotor motion and current waveform during drive in a step motor %* Figure 4 shows BI,
The timing chart of the drive timing detection control when the D is activated. Figure 5 is the timing chart of the drive timing detection control when the needle is corrected in forward rotation and fast forward V. Figure R46 is the drive timing at 9 o'clock when the reverse rotation and fast forward are used to correct the forceps. (Timing chart of detection control), *7 Incidentally, Fig. 8 is a timing chart of the detection control circuit during forward rotation and fast forwarding of needle correction, and Fig. 9 is a timing chart of the drive circuit during forward rotation and fast forwarding of forceps correction. This is the drive circuit for forward rotation and fast forwarding when fixing nails. In FIG. 1, 1 is a stator, 2 is a coil, and 3! ”j
Rotor, 4ri quiet stable direction, 5 neutral direction, 6ri dynamic stable direction, ZFi notch. In Figure 142, (a) and (b) when the shield is passed through the signal-@,
(cl and (d) during bias 111 dBLD operation, (81 and (r) signal d during forward rotation fast forward, (- and sail) are the respective drive signals during forward rotation fast forward. Here, a'+b' and C' are the intervals between each drive step. In the third equation, (A) is the movement of the rotor 3 during one step drive, (]11 is the flow n to the #41 coil 2 at that time. The electric current is of the type flLtlL, where t is the driving force (
This is the end of the pulse application, and 8 and 9 are the timings in which the rotor 3 is moving in the damped vibration or in the normal rotation direction, and the reverse induced current is at its maximum. In Fig. 4, (υ is drive pulse number 971 for completion of two-step continuous drive, (j) t'j is current waveform at this time, (
k) is a 7'tl pressure waveform obtained by chopper-amplifying this current waveform only in the direction where the damped vibration energy can be effectively used for the next drive. Here, the section of point sgA of (k) and Hl is 2
This is the detection section of 00m. This is the f7tv(j)ri next generation driver pulse signal. 1. is the moment of detection. In Figure 95, (!! 11 is the normal rotation fast forward N M H k
0] is the chopper amplified voltage tIi type, and the section where the dotted line signal is Hl is the detection section of 200 m5ec. (p) is the next drive pulse (% ts Fi lateral detection moment in No. 1. Marks, (r) and (-) are the drive signal, current waveform, and chopper amplification voltage waveform of the next drive pulse, respectively. To9, t
4 is also the moment of detection. In addition, (Ii 嘗) is a signal of Hl only at the falling edge of the drive pulse wI4, (a@>Lr1(
a@＞'r Signal delayed by 200m5ae from the RI, (8
6) u (Im) A signal that inverts when the signal rises, (
@s) is the @ sign 300m after the end of the driving nozzle signal applied to otllVc, and (-.) is for Os. In Fig. 6, (1) and (u) are the drive pulse signals at the start of reverse fast forwarding, and the terminals of the n-t''fl coil 2. (The first is the chopper amplified voltage waveform, and the section where the dotted line signal is Hl is the detection section of 200 m5ec. This is the moment of detection of t and ri. Also, (X) and (y )H is the next drive pulse signal for reverse fast forwarding, and
A voltage t is applied to the terminal Os side of the coil 2 and Os Im. In Figure 7, 0 and @ are connected to comparators j/ and '
is a resistor, which divides the voltage and detects and compares the voltage t. [
] is this resistance partial voltage t switching element, Oa
d' m see delay circular, o, (!!, o and 0 are 81T-RK811jT-FL engineering P-FLOP, Q!I
It is an IH counter. i, o, o, o, o, o and [phase] are the input terminals of the detection circuit, and 94.0 is the single output terminal. Mayt-Ors, @ output g! This is the number. In Figure 8, (sa) and (cl) are the seventh
Driving pulse signal output from 0 and 0, (a,)
and (dl) are chopper signals, (bl) and (el) are 1 of Hl only in the chopper section due to the rl 岨) and (dl) signals - jjK! This is the number. 10 and 11 are drive numbers (
This is the pulse application timing. In Fig. 9, rl is the resistance of the impedance closed circuit, and the area inside the dotted line is the drive inverter. Figure 3 shows Sakuma 7.

Claims (1)

[Claims] In electronic time 1iiK, which has a step motor and a drive timing detection control circuit, the surplus drive energy of the step motor is effectively used for the drive 1i111 of the next step, without wasting it in the damped vibration of the rotor during continuous rapid forward movement of the pointer. The drive timing that can be detected and controlled from the reverse induced current caused by damped vibration of the rotortl#
Drive timing detection control of a step motor for a watch am.