JP2002328185A - Control device and method for stepping motor, and clocking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device and a control method of high reliability, eliminating the influence of the magnetic field from a power generating device to allow clocking without a hand movement error in a wrist watch device or the like in which a stopping motor for hand movement and the power generating device are enclosed. SOLUTION: Pulse SP1 for detecting the alternating current magnetic field is conventionally outputted in a reverse pole direction to the drive pole side, while in this case, the detecting pulse SP1 is outputted on both the drive pole side and the reverse pole side so that the magnetic field with polarity can be detected even if it is outputted as noise from the power generating device, and the detection time is extended to improve detection sensitivity. When the magnetic field is detected, auxiliary pulse P2 of large effective power is outputted in place of the drive pulse P1. The rotation detection of a driving rotor is thereby omitted, and the occurrence of erroneous detection leading to the hand movement error is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device and a control method for a stepping motor.
The present invention relates to a control device and a control method suitable for an electronic timepiece that drives a stepping motor using the electric power.

[0002]

2. Description of the Related Art A stepping motor is a pulse motor,
It is also called a stepping motor, a stepping motor, a digital motor, or the like, and is a motor driven by a pulse signal that is frequently used as an actuator of a digital control device. In recent years, small electronic devices or information devices suitable for carrying have been developed, and small and lightweight stepping motors are often used as these actuators. A typical example of such an electronic device is a clock device such as an electronic timepiece, a time switch, and a chronograph. FIG. 12 shows an example of a timing device such as a wristwatch device using a stepping motor. This timing device 9
Includes a stepping motor 10, a control device 20 for driving the stepping motor 10, a wheel train 50 for transmitting the movement of the stepping motor 10, and a second hand 61, a minute hand 62 and an hour hand 63 driven by the wheel train 50. I have. The stepping motor 10 is driven by a drive coil 11 that generates a magnetic force by a drive pulse supplied from a control device 20, a stator 12 that is excited by the drive coil 11, and a magnetic field that is excited inside the stator 12. PM type (permanent magnet rotating type) stepping motor 1 including a rotor 13, wherein the rotor 13 is constituted by a disk-shaped two-pole permanent magnet
It is 0. The stator 12 is provided with a magnetic saturation portion 17 so that different magnetic poles are generated in respective phases (poles) 15 and 16 around the rotor 13 by a magnetic force generated by the drive coil 11. Further, an inner notch 18 is provided at an appropriate position on the inner periphery of the stator 12 to regulate the rotation direction of the rotor 13, so that cogging torque is generated so that the rotor 13 stops at an appropriate position. ing.

The rotation of the rotor 13 of the stepping motor 10 is controlled by a fifth wheel & pinion 5 meshed with the rotor 13 through a pinion.
1, fourth wheel 52, third wheel 53, second wheel 54, minute wheel 5
The power is transmitted to each hand by a train wheel 50 including the wheel 5 and the hour wheel 56. A second hand 61 is connected to the axis of the fourth wheel & pinion 52, a minute hand 62 is connected to the second wheel & pinion 54, and an hour hand 63 is connected to the hour wheel & pinion 56. The hands indicate the time. It is of course possible to connect a transmission system (not shown) for displaying the date and the like to the wheel train 50.

In order to display the time by the rotation of the stepping motor 10, the time counting device 9 supplies a driving pulse to the stepping motor 10 by counting (timing) a signal of a reference frequency. The control device 20 of the present embodiment for controlling the stepping motor 10 includes a pulse synthesizing circuit 22 that generates a reference pulse having a reference frequency and a pulse signal having a different pulse width and timing by using a reference oscillation source 21 such as a crystal oscillator. Based on various pulse signals supplied from the synthesizing circuit 22, the stepping motor 10
Is provided. Further, the control circuit 23 includes a drive control circuit 2 for controlling a drive circuit described later.
4 and a detection circuit 25 for performing rotation detection and the like.
The drive control circuit 24 is connected to the drive coil 11 via the drive circuit.
A driving pulse supply unit 2 for supplying a driving pulse for driving the driving rotor 13 of the stepping motor 10
4a, a rotation detection pulse supply unit 24b for outputting a rotation detection pulse for inducing an induced voltage for detecting the rotation of the driving rotor 13 subsequent to the driving pulse, and detecting an external magnetic field to the stepping motor prior to the driving pulse A magnetic field detection pulse supply unit 24c for outputting a magnetic field detection pulse for inducing an induced voltage, and an auxiliary having a larger effective power than the drive pulse when the drive rotor 13 does not rotate or an external magnetic field is detected. An auxiliary pulse supply unit 24d for outputting a pulse and a demagnetization pulse supply unit 24e for outputting a demagnetization pulse having a different polarity from the auxiliary pulse for demagnetization following the auxiliary pulse are provided.

[0005] The detection circuit 25 includes a rotation determination unit 26 for comparing the induced voltage for rotation detection obtained by the rotation detection pulse with a set value to detect the presence or absence of rotation, and a magnetic field obtained by the magnetic field detection pulse. A magnetic field determination unit 27 that determines the presence or absence of a magnetic field by comparing the induction voltage for detection with a set value is provided. As shown in FIG. 13, the rotation determination unit 26 compares the value of the bidirectional induced voltage generated in the drive coil 11 by the two comparators 29a and 29b with the set value SV1 to determine whether the drive rotor 13 has rotated. Have confirmed. The magnetic field determination unit 27 sets the threshold value of the inverter to the set value SV2 using the two inverters 28a and 28b.
To determine the presence or absence of a magnetic field. Then, the respective determination results are fed back to the drive control circuit 24 via the OR gates 28c and 29c, respectively, and are used for controlling the stepping motor.

On the other hand, a drive circuit 30 for supplying various drive pulses to the stepping motor 10 under the control of the drive control circuit 24 includes an n-channel MOS 33 connected in series.
a and p-channel MOS 32a and n-channel M
A bridge circuit composed of an OS 33b and a p-channel MOS 32b is provided,
From 1, the power supplied to the stepping motor 10 can be controlled. Furthermore, p-channel MOS
It has rotation detecting resistors 35a and 35b connected in parallel with 32a and 32b, respectively, and sampling p-channel MOSs 34a and 34b for supplying chopper pulses to these resistors 35a and 35b. Therefore, these MOSs 32a, 32b, 33
By applying control pulses having different polarities and pulse widths to the respective gate electrodes a, 33b, 34a, and 34b from the respective pulse supply units 24a to 24e of the drive control circuit 24 at respective timings, the drive coils 11 have different polarities. A drive pulse can be supplied, or a detection pulse for exciting the induced voltage for detecting the rotation of the rotor 13 and detecting the magnetic field can be supplied.

FIG. 14 shows a p-channel MOS 33a and an n-channel MOS 3 for exciting a magnetic field of one polarity to the drive coil 11 for driving the stepping motor 10 to rotate.
2a and p-channel MOS 34a for sampling
Gates GP1, GN1, and GS1, and p-channel MOS 33b, n-channel MOS 32b for exciting a magnetic field in the opposite direction, and gates GP2, GN2, and GS2 for p-channel MOS 34b for sampling.
Are shown using a timing chart. The control device 20 for this stepping motor
In order to control the stepping motor 10 of the timer 9, the hands are moved every second.
Is supplied with a series of control signals cyclically. At the beginning of each cycle, noise occurs when performing rotation detection,
Magnetic field detection pulses SP0 and SP1 for detecting the presence or absence of a magnetic field that causes erroneous detection are output. The magnetic field detection pulse SP0 output at time t1 is a pulse for detecting a noise magnetic field due to high frequency noise, and the control signal for outputting the magnetic field detection pulse SP0 is the drive control circuit 2
4 is supplied to the gate GP1 of the p-channel MOS 33a on the drive side (drive pole side) on which the drive pulse P1 is output from the magnetic field detection pulse supply unit 24c. The magnetic field detection pulse SP0 is a continuous control pulse having a width of about 20 ms, and is used to detect a noise magnetic field due to high-frequency noise accompanying switching of home electric appliances such as an electric blanket and an electric kotatsu. Subsequently, at time t2, a control signal for outputting a magnetic field detection pulse SP1 for detecting an AC magnetic field of 50 to 60 Hz is similarly output from the magnetic field detection pulse supply unit 24c to the drive pole side (reverse pole).
Is supplied to the gate GP2 of the p-channel MOS 33b. The pulse SP1 for detecting the magnetic field is an intermittent chopper pulse having a duty ratio of about 1/8, thereby sampling the current induced in the drive coil 11 by the AC magnetic field in the form of a voltage. The determination can be made by the magnetic field determination unit 27. In addition, the drive pole side,
That is, the p-channel MOS 33a and the n-channel MOS 32a supply the control pulse SP1 to the gate P2 to supply the control pulse SP1 to the gate P2 in the opposite polarity to the driving side, in consideration of the fact that the magnetic field detecting ability is reduced when an auxiliary pulse having a large effective power described later is applied. Is driven. These magnetic field detections are described in
No. 5,798,798.

After the control pulses for outputting the magnetic field detecting pulses SP0 and SP1, the driving pulse P at time t3
1 is output from the drive pulse supply unit 24a of the drive control circuit 24 to the n-channel MO on the drive pole side.
Gate GN1 of S32a and p-channel MOS 33
a is supplied to the gate GP1. The effective power of the drive pulse P1 is reduced to the extent that the drive rotor 13 rotates. For example, the drive pulse P1 having a pulse width W10 is supplied at time t3. The control signal for outputting the driving pulse P1 can control the effective power by changing the pulse width of the driving pulse. When the auxiliary pulse P2 is output without the rotor 13 rotating, the pulse width is increased. To increase the effective power. On the other hand, if the rotor 13 can be driven a predetermined number of times continuously with the same pulse width, the pulse width can be narrowed and the effective power can be reduced.

After the drive pulse P1, a rotation detection pulse SP2 for detecting the rotation of the drive rotor 13 at time t4.
Is output from the rotation detection pulse supply unit 24b of the drive control circuit 24 to the p-channel M on the drive pole side.
Gate GP1 of OS33a and MO for sampling
The signal is supplied to the gate GS1 in S34a. The rotation detection pulse SP2 is a chopper pulse having a duty of about 、, and is used when the rotor 13 rotates.
The induced current excited by 1 is obtained as an output voltage of the rotation detecting resistor 35a. Then, the voltage of the rotation detection resistor 35a is compared with the set value SV1 by the rotation detection unit 26 of the detection circuit 25, and it can be determined whether the rotor 13 has rotated.

If the induced voltage excited by the rotation detection pulse SP2 does not reach the set value SV1, the rotor 13
Is determined not to have rotated, and a control signal for outputting the auxiliary pulse P2 at time t5 is supplied from the auxiliary pulse supply unit 24d of the drive control circuit 24 to the n-channel M on the drive pole side.
Gate GN1 of OS32a and p-channel MOS3
3a is supplied to the gate GP1. The auxiliary pulse P2 is
This is a driving pulse having a pulse width W20 having a larger effective power than the driving pulse P1 having energy enough to rotate the rotor 13 without fail. This auxiliary pulse P2 is output in place of the drive pulse P1 when the rotation of the rotor 13 is not detected and when a magnetic field is detected by one of the magnetic field detection pulses SP0 and SP1. If a magnetic field that becomes noise is detected around the stepping motor 10, there is a possibility that a magnetic field that is noise is detected by the rotation detection pulse SP2 even if the rotor 13 is not rotating. There is. Therefore, when a magnetic field is detected, power consumption is increased by outputting an auxiliary pulse P2 that does not require rotation detection, but it is possible to prevent a hand movement error from occurring.

After the output of the auxiliary pulse P2, a control pulse for outputting a degaussing pulse PE is supplied to the degaussing pulse supply unit 24 of the drive control circuit 24 at time t14.
The gate GN of the n-channel MOS 32b on the opposite pole side from e.
2 and the gate GP2 of the p-channel MOS 33b. This degaussing pulse PE is for reducing the residual magnetic flux of the drive coil 11 generated by the auxiliary pulse P2 having a large effective power, and is realized by supplying a pulse having a polarity opposite to that of the auxiliary pulse P2. .
By supplying the degaussing pulse PE, a series of cycles for driving the stepping motor 10 to rotate one step angle is completed.

At time t11, which is one second after time t1, the next cycle for further rotating the stepping motor 10 by one step angle is started. In this cycle, the MOSs 32b, 33b and 34b on the opposite side of the previous cycle are on the drive pole side. As in the previous cycle,
First, at time t11, a pulse SP0 for detecting magnetic flux noise due to high-frequency noise is output, and then at time t12
A pulse SP1 for detecting noise due to a low-frequency AC magnetic field is output. When no magnetic field noise is detected, the driving pulse P1 is output at time t13.
Since the auxiliary pulse P2 has been output in the previous cycle, the effective power of the drive pulse P1 has been increased, and the drive pulse P1 having a pulse width W11 wider than the drive pulse in the previous cycle is output at time t13. Further, at time t1
A pulse SP2 for rotation detection is output to 4, and when the rotation of the rotor 13 is detected thereby, the cycle ends at this stage.

FIG. 15 is a flowchart showing the operation of the control device 20 described above. First, in step ST1, a reference pulse for timing is counted and one second is measured. After one second has elapsed, a high-frequency magnetic field is detected using the magnetic field detection pulse SP0 in step ST2.
When a high-frequency magnetic field is detected, an auxiliary pulse P2 having a large effective power is supplied in place of the driving pulse P1 in step ST7 to prevent a hand operation error due to an erroneous detection. If no high-frequency magnetic field is detected, in step ST3, the presence or absence of an AC magnetic field, which is a low-frequency magnetic field, is checked using the magnetic field detection pulse SP1. If there is an AC magnetic field, an auxiliary pulse P2 is output in step ST7 in the same manner as described above to prevent hand movement errors.

If no magnetic field is detected in these steps, a drive pulse P1 is output in step ST4, and then a rotation detection pulse SP is output in step ST5.
2 is output to check whether the rotor 13 is rotating. If rotation cannot be confirmed, an auxiliary pulse P2 having a large effective power is supplied in step ST7 to surely rotate the rotor 13. When the auxiliary pulse P2 is output, step S
The demagnetizing pulse PE is output at T8, and the level of the drive pulse P1 after the auxiliary pulse is output at step ST10 (first level adjustment). If a rotation failure occurs in step ST5, the rotation failure is repeated even if the drive pulse P1 having the same effective power is supplied. Therefore, in step ST11, the cause of the output of the auxiliary pulse P2 is determined, and in step ST12, the drive pulse P1 is set so as to output the drive pulse P1 having a higher effective power by one stage, and the process returns to step ST1 to perform the timing operation.

On the other hand, if it is determined in step ST5 that the rotation of the rotor 13 by the drive pulse P1 has been determined, a level adjustment (second level adjustment) for reducing the effective power of the drive pulse P1 is performed in step ST6. In many cases, the effective power of the drive pulse is reduced by confirming that the rotor 13 has been rotated a plurality of times by the drive pulse P1 having the same effective power. By performing such control, the power consumption of the drive pulse P1 can be reduced, and a hand movement error can be eliminated even in a place where a magnetic field from an electric product is present. be able to.

[0016]

In recent years, there has been marketed a time-measuring device which incorporates a generator as a wristwatch device or the like and which can drive a hand-operating stepping motor with electric power generated by capturing movement of a user's arm or the like. Since the timepiece with built-in power generator can be used without using a battery, there is no need to replace the battery, and the timepiece can be continued anytime and anywhere using natural energy around the user, such as arm movement or vibration. In addition, there is no problem such as disposal and pollution associated with battery disposal. For this reason, it is attracting attention as a technology that is greatly utilized in watches and the like in the future.

However, an AC generator in which a power generation rotor having substantially the same configuration as that of a stepping motor rotates inside a stator is used as a power generation device for generating power by capturing a user's movement. Is rotated by an energy transmitting means such as a rotary weight that converts kinetic energy into rotation. Accordingly, the magnetic flux generated from the power generation device also becomes noise when detecting the rotation of the drive rotor of the stepping motor, and causes a reduction in the reliability of the timekeeping device. The electromagnetic noise from the power generation device has a frequency of about 200 to 300 Hz, and the above-described conventional magnetic field detection pulse SP0 for detecting high-frequency noise.
This is a frequency band that is difficult to detect with the magnetic field detection pulse SP1 for detecting the AC magnetic flux of 50 to 60 Hz. Further, the power generation device does not always generate power, but generates power only when the rotary weight turns due to swing of an arm or the like. Therefore, the generation of a magnetic field that causes noise is irregular,
It is often as short as about 0 ms. For this reason, there is a high possibility that noise is generated when the rotation detection pulse SP2 is output from the magnetic flux detection pulse SP0 or SP1 even if the rotation detection pulse SP2 is not detected. In addition, since the half-wave rectification, which is easy to reduce in size and is low in cost, is generally adopted, the magnetic noise has directionality, and the conventional detection method as described above causes the magnetic noise which causes erroneous detection when detecting rotation. Is not necessarily detected. Further, when the auxiliary pulse P2 is output after the magnetic noise is detected, there is a problem that the magnetic detection capability is reduced in the same direction due to the influence of residual magnetism.

As described above, the stepping motor control device built in the time measuring device together with the AC generator using the magnetic field can eliminate the influence of the external magnetic field and also suppress the influence of the magnetic field from the AC generator. This is an urgent need to provide a reliable timing device. Therefore, in the present invention, in the control device of the stepping motor housed at the same time as the AC power generation device, the influence of the magnetic field from the power generation device as well as the influence of the magnetic field from the outside as described above is prevented, and there is no hand operation mistake and reliability. It is an object of the present invention to provide a control device and a control method capable of performing high control. And a highly accurate timing device with a built-in power generation device can be used anytime and anywhere,
It is a further object of the present invention to provide a highly reliable timepiece that can be used without worrying about battery disposal.

[0019]

SUMMARY OF THE INVENTION In order to minimize the influence of the magnetic field of the power generator as much as possible, in the present invention,
First, in order to increase the detection sensitivity of the magnetic field, the detection of the AC magnetic field is performed not only on the side opposite to the driving pole but also on the driving pole. That is, the power generating device of the present invention, in which the power generating rotor rotates inside the power generating stator to generate power, operates by the kinetic energy transmitting means to generate electric power, and uses the electric power supplied through the electric storage means to generate a large amount of electric power. What is claimed is: 1. A control device for a stepping motor capable of driving a pole-magnetized driving rotor to rotate in a driving stator having a driving coil, the driving unit supplying a driving pulse to the driving coil for driving the driving rotor. Rotation detection means for supplying a rotation detection pulse for inducing an induction voltage for detecting rotation of the driving rotor following the driving pulse; and an induction voltage for detecting a magnetic field external to the stepping motor prior to the driving pulse. Magnetic field detecting means for supplying a magnetic field detection pulse for inducing a rotation detection pulse and a rotation detection pulse obtained by the magnetic field detection pulse and Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the induced voltage for field detection with each set value, and determining whether or not the drive rotor is not rotating, or when a drive pulse is detected when an external magnetic field is detected. In the control device for a stepping motor having auxiliary means for supplying an auxiliary pulse having a large effective power, the magnetic field detection means detects first and second polarities different from each other with respect to the drive coil in order to detect a magnetic field in substantially the same frequency band. It is characterized in that the magnetic field detection pulse is supplied prior to the drive pulse.

Further, a power generating device in which the power generating rotor rotates inside the power generating stator to generate power is operated by the kinetic energy transmitting means to generate electric power, and the electric power is supplied by the electric power storage means. A method of controlling a stepping motor capable of driving a pole-magnetized driving rotor to rotate within a driving stator having a driving coil, the method comprising: supplying a driving pulse to the driving coil to drive the driving rotor. And a rotation detection step of outputting a rotation detection pulse to the drive coil following the drive pulse, and comparing the induced voltage with a first set value to detect whether or not rotation is possible, and a stepping motor applied to the drive coil prior to the drive pulse. A magnetic field detection step of outputting a magnetic field detection pulse for detecting an external magnetic field with respect to the magnetic field and comparing the induced voltage with a second set value to detect a magnetic field; A stepping motor that does not rotate or that supplies an auxiliary pulse having a larger effective power than the drive pulse when an external magnetic field is detected. In order to detect the magnetic field, a magnetic field is detected by exciting induced voltages having different polarities to the drive coil.

As described above, the AC magnetic flux is detected on the side opposite to the drive pole side and the AC magnetic flux is also detected on the drive pole side, so that the power generating apparatus mainly affects the drive pole side. Even when a strong magnetic field is generated and affecting the drive coil, there is a high possibility that such a magnetic field can be detected. In particular, a magnetic field that affects the drive pole side is detected at the time of rotation detection, and is highly likely to lead to a hand movement error. Therefore, by detecting a magnetic field that affects the drive pole side, it is possible to significantly suppress a decrease in the reliability of the stepping motor due to the external magnetic field. Conventionally, an AC magnetic field has not been detected on the driving pole side in consideration of a decrease in sensitivity due to a residual magnetic field of an auxiliary pulse. However, as in the present invention,
By detecting the AC magnetic field on the drive pole side,
Since the magnetic field can be detected at both poles and the time for detecting the magnetic field is doubled, the probability of detecting the magnetic field is improved. Therefore, in a timekeeping device or the like in which the power generation device is housed together with the control device of the stepping motor, the presence or absence of the influence of the magnetic field of the power generation device can be detected with high sensitivity. .

In consideration of the fact that the generation of a magnetic field as noise is irregular and often as short as several hundred milliseconds, any timing during the supply of a magnetic field detection pulse, a drive pulse, a rotation detection pulse, and the like is considered. It is not known whether or not a magnetic field is generated. Therefore, it is also effective to supply a magnetic field detection pulse immediately after the rotation detection pulse and check the detection accuracy by the rotation detection pulse. That is, the stepping motor control device, wherein the magnetic field detecting means can supply the magnetic field detection pulse to the drive coil before the drive pulse and immediately after the rotation detection pulse, is also effective in improving the reliability of the timekeeping device. is there. In the stepping motor control method, a magnetic field detection pulse for detecting an external magnetic field for the stepping motor is output to the drive coil prior to the drive pulse, and the induced voltage is compared with a second set value to perform a first magnetic field detection. In addition to the magnetic field detecting step, a second magnetic field for detecting a magnetic field by outputting a magnetic field detection pulse for detecting an external magnetic field to the stepping motor to the drive coil following the rotation detection pulse and comparing the induced voltage with a second set value It is effective to provide a detection step.

Further, since the electric power from the power generator is supplied to the control device of the stepping motor via the charging means,
The voltage such as the drive pulse supplied to the stepping motor also varies according to the charging voltage of the charging means. In general, when the charging voltage increases, the voltage such as a driving pulse also increases, so that the S / N ratio increases and the magnetic field detection ability tends to decrease. Therefore, in the control device for a stepping motor according to the present invention, the set value for determining the induced voltage for detecting the magnetic field in the determination means can be adjusted by the charging voltage of the power storage means. Thus, the detection probability of the magnetic field can be increased by preventing the sensitivity for detecting the magnetic field from decreasing. In the stepping motor control method according to the present invention, in the above-described magnetic field detecting step, the detection probability of the magnetic field can be increased by adjusting the second set value by the charging voltage of the power storage means.

Further, instead of detecting the magnetic field of the power generation device, it is detected that the power generation device is generating power, and control is performed during the power generation on the assumption that there is a magnetic field affecting rotation detection. Is also effective. That is, in the control device for a stepping motor according to the present invention, it is also effective to supply the auxiliary pulse during the power generation of the power generator by the above-described auxiliary means regardless of whether or not a magnetic field is detected. In the method of controlling a stepping motor according to the present invention, it is effective to supply the auxiliary pulse during the power generation by the power generation means regardless of the presence or absence of a magnetic field in the above-described auxiliary step.
Also, it is known that when an auxiliary pulse having a large effective power is supplied, the ability to detect a magnetic field is reduced, but by selecting an auxiliary pulse depending on whether or not power is being generated,
There is no need to detect the presence or absence of a magnetic field following the auxiliary pulse. Therefore, the reliability of the control of the stepping motor can be further improved.

When a short pulse supply means for supplying a short pulse such as a fast-forward pulse or a reverse rotation pulse having a shorter cycle than the drive pulse to the drive coil is provided, a hand movement error due to a voltage fluctuation during power generation is prevented. It is desirable to stop the supply of short pulses during power generation by the power generation means. Similarly, not only a fast-forward pulse with a short cycle but also a pulse for driving the drive rotor in the reverse direction (reverse rotation pulse) is a combination of a plurality of pulses with a short cycle. Therefore, it is desirable to forcibly stop the reverse drive during power generation. Even in the case of the stepping motor control method, if the driving coil includes a short pulse supplying step of supplying a short pulse called a fast-forward pulse or a reverse rotation pulse having a shorter cycle than the driving pulse, the short pulse is generated during the power generation of the power generating means. It is desirable to stop the supply of water.

Further, when a magnetic field is detected, or when the power generator generates power and an auxiliary pulse is output, there is a high possibility that the magnetic field remains continuously. In addition, the auxiliary pulse reduces the magnetic field detection ability. Therefore, by supplying a pulse having a large effective power as a predetermined number of drive pulses following the auxiliary pulse, it is not necessary to detect the presence or absence of rotation, and it is possible to prevent a hand operation error. In the case where the driving means can supply a plurality of driving pulses of effective power, at least one driving pulse having a larger effective power than the immediately preceding driving pulse can be supplied after the auxiliary pulse is supplied. The effective power can be adjusted by supplying drive pulses having different pulse widths or drive pulses having different voltages. Alternatively, in the case where a degaussing means for supplying a degaussing pulse having a different polarity from the auxiliary pulse for degaussing following the auxiliary pulse is provided, the degaussing pulse may be supplied immediately before the driving pulse supplied following the auxiliary pulse. The substantial power of the driving pulse can be increased.

On the other hand, in the control method of the present invention, after the auxiliary pulse is supplied, at least one drive pulse having a larger effective power than the immediately preceding drive pulse is supplied.
Is effective. In the case where a degaussing step of supplying a degaussing pulse having a different polarity from the auxiliary pulse for degaussing following the auxiliary pulse is provided, the degaussing pulse may be supplied immediately before the driving pulse supplied following the auxiliary pulse. It is valid.

As described above, the detection probability of the magnetic field is improved, the presence / absence of the magnetic field is determined based on the presence / absence of power generation by the power generator instead of the detection of the magnetic field. By supplying a large drive pulse, it is possible to provide a control device and a control method for a stepping motor that are hardly affected by a magnetic field from a power generation device housed in the same device. For this reason, by adopting the control device or the control method of the present invention, it is possible to perform stable and reliable hand movement using the stepping motor. Therefore, the control device for the stepping motor of the present invention, the stepping motor for moving the clock hand by the driving pulse, the pulse synthesizing means for outputting pulse signals of a plurality of frequencies, and the above-described power generation capable of supplying power to these By realizing a timekeeping device equipped with a device, a battery is unnecessary and can be used anytime and anywhere,
A highly accurate timing device can be provided.

The method of controlling a stepping motor according to the present invention can be provided in a state stored in a computer-readable medium as a logic circuit, a control program for a microprocessor, or the like. The present invention can be applied to a device that requires motor drive that requires intermittent and highly accurate hand movement.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The present invention will be described in more detail with reference to the drawings. FIG.
FIG. 1 shows a schematic configuration of a timing device 1 according to a first embodiment of the present invention. The timekeeping device 1 of this example drives the stepping motor 10 by the control device 20 and transmits the movement of the stepping motor 10 to the second hand 61, the minute hand 62 and the hour hand 63 via the train wheel 50 to perform the hand movement. I have. The main configurations of the stepping motor 10, the wheel train 50, and the control device 20 are the same as those described with reference to FIG. 12, and the common portions are denoted by the same reference numerals, and detailed description thereof will be omitted below.

The timekeeping device 1 of the present embodiment includes a power generation device 40 for supplying power for driving, in addition to a control device 20 for driving the stepping motor 10. As the power generation device 40, an electromagnetic induction type AC power generation device capable of outputting power induced by a power generation coil 44 connected to the power generation stator 42 by rotating the power generation rotor 43 inside the power generation stator 42 is used. Have been. Further, the timing device 1 of the present embodiment
The rotary weight 45 is used as a means for transmitting kinetic energy to the power generation rotor 43, and the movement of the rotary weight 45 is transmitted to the power generation rotor 43 via the speed increasing gear 46. . In the wristwatch-type timing device 1, the rotating weight 45 can turn inside the device by capturing the movement of the user's arm or the like, and generates power using natural energy related to the user's life. The clock device 1 can be driven using electric power.

The electric power output from the power generating device 40 is once half-wave rectified by the diode 47 and then temporarily stored in a large-capacity capacitor 48 as a power storage means. And
Driving power for driving the stepping motor 10 is supplied from the large-capacity capacitor 48 to the drive circuit 30 of the control device 20 via the step-up / step-down circuit 49. The step-up / step-down circuit 49 of the present example includes a plurality of capacitors 49a, 49b and 49
By using c, the voltage can be raised and lowered in multiple stages, and the voltage supplied to the drive circuit 30 can be adjusted by the control signal φ11 from the drive control circuit 24 of the control device 20. Further, the output voltage of the step-up / step-down circuit 49 is also supplied to the drive control circuit 24 by the monitor circuit φ12, whereby the output voltage can be monitored, and whether the power generation device 40 is generating power by a small increase or decrease of the output voltage. The determination is made on the drive control circuit 24 side.

The control circuit 23 employed in the control device 20 of the timekeeping device 1 of the present embodiment also includes a drive control circuit 24 and a detection circuit 2
5 is provided. The drive control circuit 24 includes a drive pulse supply unit 24a that supplies a drive pulse P1 to the drive coil 11 via the drive circuit 30, and a rotation detection pulse supply unit 24b that supplies a pulse SP2 for rotation detection following the drive pulse.
A magnetic field detection pulse supply unit 24c for supplying magnetic field detection pulses SP0 and SP1 for detecting a magnetic field prior to the drive pulse, an auxiliary pulse supply unit 24d for supplying an auxiliary pulse P2 having an effective power larger than the drive pulse, and A degaussing pulse supply unit 24e that supplies a degaussing pulse PE following the auxiliary pulse is provided.

The drive pulse supply section 24a of this embodiment is capable of adjusting the effective power of the drive pulse P1 by controlling the step-up / step-down circuit 49. For this reason, the effective power of the drive pulse P1 can be controlled by the pulse width and the voltage, so that the drive power can be finely controlled, and the drive pulse of power suitable for rotating the drive rotor 13 is supplied to save power. We are aiming for electric power.

Further, the drive pulse supply section 24a of this embodiment also serves as a short pulse supply means for supplying a fast-forward pulse and a reverse rotation pulse, and can also supply these short-cycle drive pulses. The drive pulse for fast-forward (fast-forward pulse) needs to be output at a short interval before the drive rotor 13 stops, and there is no timing to confirm the presence or absence of rotation. Therefore, it is necessary to supply a drive pulse with stable power. However, during power generation, the power supplied to the drive circuit 30 is difficult to stabilize, causing a hand movement error. For this reason, in this example, when an external magnetic field is detected, there is a high possibility that power is being generated, so fast-forwarding is forcibly stopped,
The control is shifted to the control for moving the hands at a normal speed. Further, it is also possible to directly determine whether or not the power generation device is generating power by the monitor circuit φ12, and it is also possible to stop the fast-forward according to the determination result. The drive pulse supply unit 24a functions as a drive pulse (reverse rotation pulse) supplied to reverse the rotor 13.
This reverse rotation pulse is also a short pulse because it is necessary to output a few pulses for one-step angle driving. Therefore, a stable power is required for the reverse rotation pulse as well as for the fast-forward pulse. Therefore,
It is desirable to be able to forcibly stop the reverse rotation pulse during power generation.

The magnetic field detection pulse supply section 24c of this embodiment outputs a pulse SP1 for detecting a low-frequency AC magnetic field from the pole opposite to the drive side as in the conventional case, and also has the same frequency band on the drive pole side. A pulse SP1 for detecting the AC magnetic field can be output, whereby the probability of detecting the magnetic field can be greatly increased. Power generation device 40 housed in timekeeping device 1 of this example
Since the power generation rotor 43 is rotated by the movement of the rotary weight 45 to generate power, the power generation timing is intermittent, and the time during which power generation is continued is not so long at several hundred ms. Therefore, when the magnetic field detection pulse SP1 is only output to the opposite pole side as in the related art, power generation is performed while the rotation detection pulse SP2 is output even if no magnetic field is detected during that time. May cause false detection. Further, in the timekeeping device 1 of the present example, since the power from the power generation device 40 is half-wave rectified by the diode 47, there is a possibility that the alternating magnetic field cannot be detected on the reverse pole side depending on the rectification direction. On the other hand, the magnetic field detection pulse supply unit 24c of the present example extends the interval for detecting the magnetic field by outputting the pulse SP1 for detecting the AC magnetic field on both the drive pole side and the opposite pole side, and further detects the rotation. It is possible to detect a magnetic field caught on the side of the driving pole which has a large influence on the driving pole. Therefore, the probability that the magnetic field can be detected is greatly increased, and erroneous detection at the time of rotation detection can be prevented to prevent the occurrence of a hand movement error.

In addition, detection of an AC magnetic field on the drive pole side has not been performed conventionally because the probability of detection is small because a residual magnetic field such as the auxiliary pulse P2 remains.
On the other hand, in this example, by detecting the magnetic field on both sides, even if the detection probability is slightly reduced,
It is possible to detect a magnetic field that directly affects rotation detection, and the time required for magnetic field detection can be extended, so that the ability to detect a magnetic field as a whole greatly increases. Therefore, the detection probability of the magnetic field of the power generation device 40 that appears intermittently and hardly to detect on the higher frequency side than the conventional AC magnetic field of about 50 to 60 Hz increases. For this reason, it is possible to prevent the rotation of the rotor from being erroneously detected.

Further, in the timekeeping device 1 of the present embodiment, the drive coil 1 is driven by the magnetic field detection pulses SP0 and SP1.
The magnetic field determination unit 27 that determines the voltage induced in 1 is provided with a setting unit 27b that controls the setting value SV2 for determination, so that the magnetic field detection sensitivity can be further improved. As shown in FIG. 2, the determination unit 27a of the magnetic field determination unit 27 of the present example
Comparators 28d and 28e are employed to determine the voltages in the respective directions generated in the drive coil 11, and the setting value SV2 compared by the comparators 28d and 28e is adjusted by an adjustment circuit 28f using a variable resistor.
Can be controlled by As shown in FIG. 3, when the power generation device 40 operates and electric power is stored in the large-capacity capacitor 48 as a power storage means, the charging voltage Vc increases with time. Accordingly, the S / N ratio between the control signal and the noise increases, so that the noise level Ln due to the magnetic field or the like relatively decreases. Therefore, as the charging voltage Vc increases, the detection sensitivity of the magnetic field exerted on the stepping motor from the power generator or the like tends to decrease. However, the strength of the magnetic field itself does not decrease. Therefore, even if the magnetic field is not detected, there is a high possibility that a signal due to the magnetic field is erroneously obtained by the rotation detection pulse. Therefore, in the timekeeping device 1 of the present embodiment, the setting unit 27b is provided in the magnetic field determination unit 27 so that the setting value SV2 is set lower as the charging voltage Vc increases, so that the magnetic field detection sensitivity can be kept high. The adjustment of the set value SV2 in accordance with the increase or decrease of the charging voltage Vc can be performed from the output voltage of the step-up / step-down circuit 49. Therefore, the control signal φ13 is supplied from the drive control circuit 24 to the setting unit 27b.

The auxiliary pulse supply section 24d of the drive control circuit 24 of the present embodiment has a detection circuit 25 as in the above-described conventional circuit.
When the rotation determining unit 26 determines that the drive rotor 13 does not rotate, and when the magnetic field determining unit 27 detects a magnetic field, the auxiliary pulse P2 having a large effective power is supplied. However, as described above, in the timekeeping device 1 of the present example, the probability that the magnetic field is detected by the magnetic field determination unit 27 is high, so that the auxiliary pulse P2 that does not require the rotation determination can be effectively output. In addition, the effect of not only the magnetic field of the power generation device 40 but also other external magnetic fields is suppressed, so that highly reliable hand operation can be performed. Also, the auxiliary pulse supply unit 24 of the present embodiment
In d, an auxiliary pulse supplied when the driving rotor 13 does not rotate with the driving pulse P1, an auxiliary pulse supplied when a high-frequency magnetic field is detected by the magnetic field detection pulse SP0, and further, a magnetic field detection pulse SP1 An auxiliary pulse P2 having the same effective power is supplied as an auxiliary pulse supplied when a low-frequency magnetic field is detected, but in each case, an auxiliary pulse having a different effective power is supplied. Is also possible.

The degaussing pulse supply unit 24 of the present embodiment for controlling the degaussing pulse PE output following the auxiliary pulse P2.
e outputs the demagnetizing pulse PE immediately before the next drive pulse P1 at a later timing than before,
Thus, the substantial effective power of the next drive pulse P1 is increased so that sufficient energy for rotating the rotor 13 can be given. Thereby, the driving pulse P
Since the rotor 13 can be reliably rotated without increasing the energy of (1), it is possible to prevent a hand operation error from occurring while suppressing an increase in power consumption under the influence of the power generator or an external magnetic field. Immediately after the output of the auxiliary pulse P2, the detection capability of the magnetic field is reduced. However, by supplying the driving pulse P1 having substantially high effective power as in this example, the rotor is surely rotated, and the rotor rotates. Since it is not necessary to detect whether or not the detection has been performed, it is possible to omit the detection of a magnetic field which is likely to be erroneously detected.

FIG. 4 is a flowchart showing an outline of a stepping motor control method employed in the timekeeping device 1 of this embodiment. Also in this flowchart, steps that are substantially the same as the control method described above with reference to FIG. 15 are denoted by the same reference numerals, and detailed description thereof will be omitted below. First, in step ST1, one second is measured for hand movement. In the control device 20 of this example, after one second has elapsed, it is next determined in step ST21 whether or not the auxiliary pulse P2 has been output in the previous cycle. As described above, if the auxiliary pulse P2 has been output in the previous cycle, the demagnetizing pulse PE of the same polarity is output immediately before the drive pulse P1. Therefore, in step ST21, the auxiliary pulse P2
Is determined to have been output, the process proceeds to step ST25, in which a demagnetizing pulse PE is output, and immediately thereafter, step 2 is performed.
In step 6, a drive pulse P1 is output, and the process returns to step ST1.
Therefore, in the next cycle after the output of the auxiliary pulse P2, the effective power of the drive pulse P1 can be increased by utilizing the power of the degaussing pulse PE.

If the auxiliary pulse P2 has not been output in the previous cycle, a high-frequency magnetic field is detected using the magnetic field detection pulse SP0 in step ST2 as in the prior art. At this time, as described above, the magnetic field determination unit 27 of the present example can change the set value SV2 according to the charging voltage, so that the magnetic field detection sensitivity can be kept high even when the charging voltage increases. If it is determined that a high-frequency magnetic field has been detected, there is a possibility that power is being generated by the power generation device 40. In this example, when a short pulse such as a fast-forward pulse or a reverse rotation pulse is supplied in step ST15, , The job is forcibly stopped. Further, in step ST7, an auxiliary pulse P2 having a large effective power is supplied in place of the driving pulse P1, thereby preventing erroneous detection due to a magnetic field and erroneous hand movement.

If the high-frequency magnetic field is not detected, in steps ST23 and ST24, the two
The two magnetic field detection pulses SP1 are alternately output to check for the presence of an AC magnetic field that is a low-frequency magnetic field. This step ST2
Also in 3 and 24, the set value SV2 for comparing the induced voltage due to the AC magnetic field can be varied, so that
High detection capability can be maintained even if the charging voltage changes depending on the presence or absence of power generation. If an AC magnetic field is detected, the power generator 40 may be operated and the voltage may not be stable. Therefore, the supply of short pulses is forcibly stopped in step ST15 as described above. Further, in step ST7, an auxiliary pulse P2 is output in place of the drive pulse P1 to prevent a hand movement error.

If no magnetic field is detected in these steps, a drive pulse P1 is output in step ST4, and then, in step ST5, a rotation detection pulse SP is output.
2 is output to check whether the rotor 13 is rotating. If rotation cannot be confirmed, an auxiliary pulse P2 having a large effective power is supplied in step ST7 to surely rotate the rotor 13. In the conventional control method, the degaussing pulse PE is output immediately after the output of the auxiliary pulse P2. However, in the control device 20 of this example, as described above, in step 25 immediately before the drive pulse P1 of the next cycle, Since the degaussing pulse PE is output, the step of outputting the degaussing pulse PE is omitted. Then, when the auxiliary pulse P2 is output due to the rotation failure, in step ST10, the level of the driving pulse P1 is adjusted (first level).
In the next cycle, a drive pulse P1 having a large effective power is supplied.

On the other hand, if the rotation of the rotor 13 due to the drive pulse P1 can be determined in step ST5, a level adjustment (second level adjustment) for reducing the effective power of the drive pulse P1 is performed in step ST6. In many cases, the effective power of the drive pulse is reduced in a certain period. By performing such control, the power consumption of the driving pulse P1 can be reduced, and a hand movement error can be eliminated even in a place where a magnetic field from an electric product is present. can do.

FIG. 5 shows an example in which a drive pulse or the like is supplied from the control device of this embodiment to the stepping motor 10 using a timing chart. FIG. 5 shows a p-channel MOS 33a and an n-channel MOS 33a that excite a magnetic field in one direction to the drive coil 11, as in FIG.
S32a and p-channel MOS3 for sampling
4a and the gates GP1, GN1, and GS1 for exciting a magnetic field in the opposite direction to the drive pole side.
The control signals supplied to the gates GP2, GN2, and GS2 of the channel MOS 33b, the n-channel MOS 32b, and the p-channel MOS 34b for sampling are shown using control signals. Portions common to FIG. Omitted.

First, when the time elapses in step ST1, the process proceeds from step ST21 to step ST2 because the auxiliary pulse P2 has not been output in the previous cycle. In step ST2, a magnetic field detection pulse SP0 for detecting a high-frequency noise magnetic field is output at time t21, whereby the first cycle is started. next,
In steps ST23 and ST24, at time t22 and time t23, a control signal for outputting a magnetic field detection pulse SP1 for detecting an AC magnetic field is supplied to both gates GP1 and GP2. If no magnetic field is detected in steps ST23 and ST24, time t2 is set in step ST4.
4, a drive pulse P1 having a pulse width W10 is output, for example, and subsequently, in step ST5, a rotation detection pulse SP2 is output at time t25. When the rotation of the drive rotor 13 is detected, this cycle ends, and step S
Returning to T1, time measurement is performed.

When the next cycle is started at time t31, a control signal for outputting a magnetic field detection pulse SP0 for detecting the same high-frequency noise magnetic field as described above is applied to the drive pole side opposite to the previous cycle. It is supplied to the gate GP2.
Subsequently, at time t32 and time t33, a control signal for outputting a pulse SP1 for detecting an AC magnetic field is supplied to each of the gates GP2 and GP1 on the pole side. When the power generation device 40 starts power generation and a magnetic field is generated, even if the magnetic field is a half-wave rectified directional magnetic field, the magnetic field is detected by one of the two magnetic field detection pulses SP1 output from both pole sides. An induced voltage is obtained, and the value is set to SV2
Is reached, the presence of a magnetic field is detected in step ST23 or ST24. If the presence of the magnetic field is detected, the drive pulse P
An auxiliary pulse P2 having a large effective power is output in place of 1 to surely rotate the rotor 13.

As soon as the next cycle starts at time t41, it is determined in step ST21 whether or not the auxiliary pulse P2 has been output in the previous cycle. If the auxiliary pulse P2 has been output, the degaussing pulse PE is output immediately in step ST25, and subsequently, at time t4
In step ST2, a drive pulse P1 is output in step ST26.
The degaussing pulse PE is a pulse having a polarity opposite to that of the auxiliary pulse P2. By supplying the driving pulse P1 of the next cycle following the degaussing pulse PE, the effective power of the driving pulse P1 can be increased. Accordingly, the rotor 13 can be reliably rotated while power generation continues and there is a magnetic field or while there is a residual magnetic field, so that rotation detection can be omitted and the possibility of error detection can be eliminated. In addition, the output of the auxiliary pulse P2 reduces the magnetic field detection ability. Therefore, it is advantageous to omit the detection of the magnetic field. Therefore, the hands can be moved reliably. In addition, the energy of the demagnetizing pulse PE can be used to move the rotor, so that the power consumed can be reduced.

In step ST26, the driving pulse P1
Is output, the process returns to step ST1 to perform time measurement.
Then, when the next cycle comes, a detection pulse SP0 for high-frequency magnetic field noise is output at time t51 in the same manner as described above. Subsequently, at times t52 and t53, a pulse SP1 for detecting an AC magnetic field is sequentially output from both poles. Then, when the power generation device stops generating power and no magnetic field is detected, a driving pulse P1 is output at time t54, and subsequently a rotation detection pulse SP2 is output. Step S
If the rotation of the rotor 13 is not detected at T5, the auxiliary pulse P2 is output in step ST7. In this case also, the degaussing pulse PE is not output immediately after the auxiliary pulse P2, and the cycle ends. When the next cycle is started at time t61, first, a degaussing pulse PE is output at time t61, and subsequently, a drive pulse P1 is output at time t62. For this reason, the force is substantially increased by the effect of the drive pulse P1, so that the rotor can be reliably driven even in this case. The drive pulse P1 output at time t62 has an increased effective power because rotation was not detected in the previous cycle, and in this example, the drive pulse P1 having a pulse width W11 larger than that of the previous cycle is the Is output to The effective power of the drive pulse P1 can be controlled using a voltage together with the pulse width or instead of the pulse width. In the timekeeping device 1 of this example, the voltage can be controlled using the step-up / step-down circuit 49. It is possible. [Second Embodiment] Next, a timing device 1 according to a second embodiment of the present invention will be described. Timing device 1 of this example
Is common to the timing device described above with reference to FIG. 1, and a detailed description based on the drawings will be omitted.
The control device 20 of the timekeeping device 1 of the present example monitors the output voltage φ12 of the
The fact that it is possible to determine whether or not 0 is performing power generation is positively used for control. That is, if fast-forwarding is being performed in the drive pulse supply unit 24a during power generation, the driving is forcibly stopped. At the same time, in consideration of the fact that rotation detection becomes difficult due to the magnetic field from the power generation device when power is being generated, a control signal for outputting the magnetic field detection pulse SP0 or SP1 is not output from the magnetic field detection pulse supply unit 24c. The auxiliary pulse supply section 24d outputs an auxiliary pulse P2 having a large effective power which does not require rotation detection. Since the effective energy of the auxiliary pulse P2 is selected so that the rotor rotates sufficiently, it is not necessary to detect the presence or absence of rotation of the rotor. Therefore, it is possible to prevent noise from being generated due to the magnetic field when rotation is detected, and it is determined that the rotor has rotated despite the fact that the rotor is not rotating. On the other hand, the supply of the auxiliary pulse P2 also reduces the magnetic field detection ability. Therefore, by determining the presence or absence of a magnetic field based on the presence or absence of power generation as in this example, control reliability is further improved.

FIG. 6 is a flowchart showing an outline of a stepping motor control method employed in the timekeeping device 1 of this embodiment. Also in this flowchart, the same steps as those of the control method described above are denoted by the same reference numerals, and detailed description of common portions will be omitted below. First, in step ST1, 1
Measure seconds. In the control device 20 of the present example, after one second has elapsed, next, in step ST31, the power generation device 40
Check whether or not is generating electricity. During power generation, as described above, there is a high possibility that the driving voltage fluctuates, so that a hand operation error is likely to occur. Therefore, when the drive pulse supply unit 24a is performing the fast-forward control or the reverse rotation control in step ST15, the supply of the short pulse such as the fast-forward pulse or the reverse rotation pulse is forcibly stopped. further,
During power generation, a mistake is likely to occur in the rotation detection due to the magnetic field of the power generation device 40. Therefore, the magnetic field detection pulses SP0 and SP1 are not output as the influence of the magnetic field.
2 is output to drive the rotor 13. As described above, when detecting that power is being generated, the timekeeping device 1 of the present embodiment omits the magnetic field detection pulses SP0 and SP1 and the rotation detection pulse SP2, and uses the auxiliary pulse P2 having a large effective power. The power consumption for driving the rotor 13 can be reduced as much as possible.

If no power is being generated in step ST31, an external high-frequency magnetic field is detected using the magnetic field detection pulse SP0 in step ST2, and the magnetic field detection pulse SP1 is detected in step ST3, as described above.
Is used to detect an external AC magnetic field (low frequency noise). If a magnetic field that hinders rotation detection is not detected in these steps, a drive pulse P1 is output in step ST4, and a rotation detection pulse SP2 is output in step ST5 to output the rotor 1
Check for the rotation of 3. If the rotation cannot be confirmed, an auxiliary pulse P having a large effective power is determined in step ST7.
2 to surely rotate the rotor 13, and then outputs a demagnetizing pulse PE in step ST8, and further adjusts the level of the driving pulse P1 if necessary. on the other hand,
In step ST5, when the rotation of the rotor 13 due to the drive pulse P1 can be determined, if the conditions are satisfied in step ST6, the level adjustment for reducing the effective power of the drive pulse P1 is performed.

FIG. 7 shows an example in which a drive pulse or the like is supplied from the control device of this embodiment to the stepping motor 10 using a timing chart. FIG. 7 also shows a p-channel M
The gates GP1 of the OS 33a, the n-channel MOS 32a, and the p-channel MOS 34a for sampling,
GN1 and GS1, and a p-channel MOS 33
the control signals supplied to the gates GP2, GN2 and GS2 of the b and n channel MOS 32b and the sampling p channel MOS 34b,
The same components as those described above are denoted by the same reference numerals and description thereof will be omitted.

In step ST1, a predetermined time (1
After the elapse of (seconds), if the power generation device 40 is not operating in step ST31, the process proceeds to step ST2. Then, in step ST2, at time t71, a magnetic field detection pulse SP0 for detecting a high-frequency noise magnetic field is output, and the first cycle is started. Next, in step ST3, at time t72, a magnetic field detection pulse SP1 for detecting an AC magnetic field is output to the gate GP2 on the side opposite to the drive pole. In this example, in step ST31, the operation status of the power generation device 40 is checked, and a process is performed in which it is assumed that a magnetic field is present regardless of whether a magnetic field is detected during operation. Therefore, there is no need to detect the magnetic field of the power generator 40. For this reason, the magnetic field detection pulse SP1 for detecting the AC magnetic field is output only to the side opposite to the driving side, as in the conventional control method described above with reference to FIG.

If a magnetic field is not detected in steps ST2 and ST3, a drive pulse P1 is output at time t73 in step ST4.
5, a rotation detection pulse SP2 is output at time t74. When the rotation of the drive rotor 13 is detected,
This cycle ends, and the process returns to step ST1 to perform time measurement.

When the next cycle is started at time t81, first, it is confirmed whether or not the power generator 40 is operating, and if it is, the process proceeds to step ST7. Then, a control pulse for outputting the auxiliary pulse P2 is supplied to the gates GP2 and GN2 on the drive pole side that are reversed from the previous cycle. Since the drive rotor 13 is completely rotated by the auxiliary pulse P2, the rotation detection is unnecessary. Subsequently, in step ST8, the degaussing pulse PE is output from the reverse pole side at time t82, and the cycle ends.

When the next cycle is started at time t83, if it is determined in step ST31 that the power generator 40 is operating, the same processing as in the previous cycle is performed. That is, the control pulse for outputting the auxiliary pulse P2 is supplied to the gates GP1 and GN1 on the drive pole side, which is reversed from the previous cycle in step ST7. Then, since the drive rotor 13 is completely rotated by the auxiliary pulse P2, the rotation is not detected, and the demagnetizing pulse PE is output from the reverse pole side at time t84 in step ST8.

At time t91, the next cycle is started. In this cycle, at step ST31, the power generator 40
Is not operating, the process proceeds to steps ST2 and ST3 for detecting a magnetic field, and outputs a high-frequency detection pulse SP0 and a low-frequency detection pulse SP1 at times t91 and t92, respectively. If no magnetic field is detected, the driving pulse P1 is output at time t93 and time t9
4 confirms the rotation of the rotor 13. When a magnetic field is detected by either the detection pulse SP0 or SP1,
As in the previous cycle, the driving pulse P2 is output in place of the driving pulse P1, and the process of detecting rotation by reliably rotating the rotor 13 can be omitted.

As described above, in the timekeeping device 1 of the present embodiment, while the built-in power generation device 40 is generating power, it is assumed that the magnetic field which affects the rotation detection of the stepping motor 10 is output. Is adopted. Therefore, the process of detecting the magnetic field from the power generation device 40, which is not so easy to detect during power generation, can be omitted, so that the control is simplified, and hand movement errors can be eliminated. On the other hand, the power consumption tends to increase during power generation because the hand is moved by the auxiliary pulse P2 having a large effective power, but the step of detecting the magnetic field and the rotation of the rotor can be omitted, so that the power consumption increases. Is also suppressed. Furthermore, in consideration of the possibility that the voltage used for driving may fluctuate during power generation, fast-forward is forcibly stopped. As described above, in the timing device 1 of the present embodiment, the stepping motor 10 is controlled by actively utilizing whether or not power is being generated, so that there is no hand movement error and a very reliable timing device. Can be provided. [Third Embodiment] Next, a timing device 1 according to a third embodiment of the present invention will be described. Timing device 1 of this example
Is also common to the timing device described earlier with reference to FIG. 1, and a detailed description of the configuration based on the drawings will be omitted. The control device 20 of the timekeeping device 1 of the present example pays attention to the fact that once the magnetic field is detected and the auxiliary pulse P2 is output, the power generation device 40 continues to operate continuously for an appropriate period, and a predetermined number of cycles The process is performed assuming that there is a magnetic field during the period so that high reliability can be obtained.
For this reason, when the auxiliary pulse P2 is output, the driving pulse supply unit 24a of the driving control circuit 24 of the control unit 20 of the present example drives the driving power whose effective power is several steps higher than the driving pulse P1 supplied at that time. The pulses are supplied for a predetermined number of cycles. Also, in the drive pulse supply unit 24a of this example, when a magnetic field is detected, it is determined that power is being generated, and fast-forward and reverse rotation are forcibly stopped in order to prevent a hand movement error due to voltage fluctuation. Like that. Further, by supplying the auxiliary pulse P2, the ability to detect a magnetic field tends to decrease. Therefore, by supplying a drive pulse having a large effective power without detecting the magnetic field for a predetermined cycle, it is possible to cover the deterioration of the magnetic field detection ability.

FIG. 8 is a flowchart showing an outline of a stepping motor control method employed in the timekeeping device 1 of this embodiment. In this flowchart, the same steps as those in the control method described above are denoted by the same reference numerals, and a detailed description thereof will be omitted below. First, in step ST1, one second is measured for hand movement. Control device 20 of this example
After 1 second elapses, it is determined whether or not within a predetermined number of C cycles (predetermined period) from the output of the auxiliary pulse P2 in the previous cycle in step ST41. In the control method of the present example, if within the C cycle from the output of the closest auxiliary pulse P2, the magnetic field is continuously output, or there is an interval where the influence of the residual magnetic field is considered, and the magnetic field detection capability is low. A period of decline is also taken into account. Therefore, no magnetic field detection is performed within C cycles from the auxiliary pulse P2,
In step ST42, a short pulse such as a fast-forward pulse is forcibly stopped. Further, in step ST43, a drive pulse having an effective power several steps higher than the level of the drive pulse P1 at that time is supplied, and the rotor 13 is reliably driven. Rotate. This eliminates the need to perform rotation detection, thereby preventing a hand movement error from occurring. And
Returning to step ST1, time measurement is performed.

On the other hand, after the auxiliary pulse P2 is output, C
If the cycle has been exceeded, an external high-frequency magnetic field is detected using the magnetic field detection pulse SP0 in step ST2 as described above, and an AC magnetic field is detected on both poles in steps ST23 and ST24. I do. This makes it possible to catch the magnetic field from the power generation device 40 with high frequency. If a magnetic field is detected in these steps, erroneous detection is made cheaply by judging whether or not the rotor 13 is rotating.
The process proceeds to step 17 to supply the auxiliary pulse P2 having a high effective power.

If no magnetic field that would hinder rotation detection is detected in these steps, a drive pulse P1 is output in step ST4, and then a rotation detection pulse SP2 is output in step ST5 to output the rotor 1
Check for the rotation of 3. If the rotation cannot be confirmed, an auxiliary pulse P having a large effective power is determined in step ST7.
2 to surely rotate the rotor 13, and then outputs a demagnetizing pulse PE in step ST8, and further adjusts the level of the driving pulse P1 if necessary. on the other hand,
In step ST5, when the rotation of the rotor 13 due to the drive pulse P1 can be determined, if the conditions are satisfied in step ST6, the level adjustment for reducing the effective power of the drive pulse P1 is performed.

FIG. 9 shows an example in which a drive pulse or the like is supplied from the control device of this embodiment to the stepping motor 10 using a timing chart. In this figure, similarly to FIG. 7 described above, each gate GP of the p-channel MOS 33a, the n-channel MOS 32a, and the sampling p-channel MOS 34a constituting the drive circuit 30 is shown.
1, GN1 and GS1, and p-channel MOS
33b, n-channel MOS 32b, and gates GP2, GN of p-channel MOS 34b for sampling
2 and the control signal supplied to the GS2, and the components common to the above-described portions are denoted by the same reference numerals and description thereof is omitted.

If a predetermined time (1 second) has elapsed in step ST1 shown in FIG.
Move to T2. In step ST2, at time t1
01 is a magnetic field detection pulse S for detecting a high-frequency noise magnetic field.
P0 is output to start the first cycle. next,
In steps ST23 and ST24, a control signal for sequentially outputting a magnetic field detection pulse SP1 for detecting an AC magnetic field is supplied to the reverse-pole gate GP2 and the drive-pole gate GP1.
3, a pulse SP1 for detecting a magnetic field having a different polarity is output. If no magnetic field is detected in these steps, the voltage V1 is detected at time t104 in step ST4.
The drive pulse P1 of 0 is supplied. Next, at step ST5, the presence or absence of rotation of the drive rotor 13 is detected at time t105. If the drive rotor 13 is rotating, the process returns to step ST1 to perform time measurement.

When the next cycle is started at time t111, the pulse S for detecting the high-frequency magnetic field is
P0 is output, followed by time t112 and time t1.
13, a pulse SP1 for detecting an AC magnetic field is output. When a magnetic field is detected by the driving-pole-side magnetic field detection pulse SP1 output at time t113, the process proceeds to step ST7.
14 outputs an auxiliary pulse P2 having a large effective power.
Then, a degaussing pulse PE is output at time t115, and this cycle ends.

When the next cycle is started at time t121, for example, the value of C is set to 2 in step ST41, the auxiliary pulse P2 is set in the previous cycle.
Is output within a predetermined period. For this reason, the process proceeds to step ST42, and each step of magnetic field detection is not performed.
If fast-forwarding is being performed, step ST42 is executed.
Is forcibly stopped. In the case of normal driving, a driving pulse whose effective power is several steps higher than the driving pulse P1 output at time t104 in step ST43 is selected and output. In the timekeeping device 1 of the present example, the voltage can be changed by using the step-up / step-down circuit 49. A large drive pulse P1 is output. This eliminates the need to perform rotation detection, and thus eliminates hand-handling errors even in an environment where there is a magnetic field that is a noise, thereby realizing a highly reliable timepiece.

When the next cycle is started at time t131, C is set to 2 in step ST41, so this cycle also falls within a predetermined period. Therefore, in step ST43, the driving pulse P1 having a large voltage and a high effective power is output at time t131.

At time t141 at which the next cycle starts, the time is outside the predetermined period, so that magnetic field detection pulses SP0 and SP1 are output again at time t141 and times t142 and 143, respectively, to determine the presence or absence of a magnetic field. Then, if no magnetic field is detected, at time t144, drive pulse P1 having the same effective voltage V10 as at time t104 and having normal effective power is output, and from time t145, rotation detection pulse SP2 is output. On the other hand, if the magnetic field is detected at this stage, the auxiliary pulse P2 is output again, and the drive pulse P1 having a large effective power is output for two predetermined cycles.

In FIG. 9, a high-voltage pulse is employed as the driving pulse having a high effective power. However, it is of course possible to control the effective power by the pulse width. It is also possible to control the effective power using both. Alternatively, it is of course possible to configure the driving pulse P1 and the auxiliary pulse P2 by a plurality of sub-pulses and control the effective power by the duty ratio. Further, in order to further improve the magnetic field detection capability during power generation, it is of course possible to perform magnetic field detection in each cycle even after outputting the auxiliary pulse. [Fourth Embodiment] Next, a timing device 1 according to a fourth embodiment of the present invention will be described. Timing device 1 of this example
Is also common to the timing device described earlier with reference to FIG. 1, and a detailed description of the configuration based on the drawings will be omitted. The control device 20 of the timekeeping device 1 of the present example is configured to further improve the frequency of magnetic field detection so as to easily detect a noise magnetic field or the like generated by the power generation device 40 which is irregular and is as short as several hundred ms. I have. For this reason, the magnetic detection pulse supply unit 24c of the drive control circuit 24 of the control unit 20 of the present embodiment supplies the magnetic detection pulse SP1 prior to the drive pulse P1, and outputs the magnetic detection pulse SP1 following the rotation detection pulse SP2. I try to supply again. Further, by changing the polarity of these magnetic detection pulses SP1, the detection probability of the noise magnetic field can be further improved.

FIG. 10 is a flowchart showing an outline of a stepping motor control method employed in the timekeeping device 1 of this embodiment. In this flowchart, the same steps as those in the control method described above are denoted by the same reference numerals, and a detailed description thereof will be omitted below. First, in step ST1, one second is measured for hand movement. Next, as described above, in step ST2, the magnetic field detection pulse S
An external high-frequency magnetic field is detected using P0, and subsequently, in step ST23, an alternating-current magnetic field (low-frequency magnetic field) is detected at one pole using a magnetic field detection pulse SP1. If a magnetic field is detected in these steps, erroneous detection is likely to occur in the determination of the presence or absence of rotation of the rotor 13, so the process proceeds to step ST17 to supply the auxiliary pulse P2 having a high effective power. At the same time, the supply of short pulses such as fast-forward pulses is stopped in step ST15.

If no magnetic field that could hinder rotation detection is detected in these steps, a drive pulse P1 is output in step ST4, and then a rotation detection pulse SP2 is output in step ST5 to output the rotor 1
Check for the rotation of 3. If the rotation cannot be confirmed, an auxiliary pulse P having a large effective power is determined in step ST7.
2 to surely rotate the rotor 13, and then outputs a demagnetizing pulse PE in step ST8, and further adjusts the level of the driving pulse P1 if necessary.

On the other hand, when the rotation of the rotor 13 due to the drive pulse P1 is determined in step ST5, immediately after that, in step ST24, in step ST23.
The AC magnetic field (low-frequency magnetic field) is detected using the magnetic field detection pulse SP1 on the pole side different from the above. If an AC magnetic field is detected in step ST24, there is a high possibility that an erroneous detection is made, so that the auxiliary pulse P0 is supplied in step ST7 as in the above embodiment. Thus, the timing before the supply of the drive pulse P1 and the rotation detection pulse S
In two steps of the timing after P2, the magnetic field detection pulse SP1
To detect the AC magnetic field, it is possible to greatly improve the probability that the magnetic field can be detected. In particular, the timing of power generation by the power generation device 40 is irregular, and
The power generation period is also usually short. Therefore, it is conceivable that a noise magnetic field is generated at the timing when the rotation detection pulse SP2 is supplied, even if the noise magnetic field is not generated at the timing before the drive pulse P1 is supplied. With respect to such a noise magnetic field, the control device 20 and the control method of the present embodiment detect the magnetic field even at a timing after the rotation detection pulse SP2, so that the drive pulse P1 is supplied or There is a high possibility that a noise magnetic field generated while the rotation detection pulse SP2 is supplied can also be detected. Therefore, it is possible to confirm the presence or absence of erroneous detection due to the noise magnetic field, and it is possible to make a highly reliable determination as to whether the rotor has rotated.

FIG. 11 shows an example in which a drive pulse or the like is supplied from the control device of this embodiment to the stepping motor 10 using a timing chart. In this figure, similarly to FIG. 7 described above, the gates G of the p-channel MOS 33a, the n-channel MOS 32a, and the sampling p-channel MOS 34a constituting the drive circuit 30 are shown.
P1, GN1 and GS1, plus p-channel MO
S33b, gates GP2, GP of an n-channel MOS 32b and a p-channel MOS 34b for sampling
It is shown using control signals supplied to N2 and GS2, and the same components as those described above are denoted by the same reference numerals and description thereof is omitted.

After a predetermined time (1 second) has elapsed in step ST1 shown in FIG. 10, a magnetic field detection pulse SP0 for detecting a high-frequency noise magnetic field is output at time t151, and the first cycle is started. Next, step ST2
At 3, a control signal for outputting a magnetic field detection pulse SP1 for detecting an AC magnetic field is supplied to the gate GP2 on the opposite pole side, and a pulse SP1 for magnetic field detection is output at time t152. If no magnetic field is detected in these steps, the pulse width W at time t153 in step ST4.
Ten drive pulses P1 are supplied, and then, in step ST5
At time t154, the presence or absence of rotation of the drive rotor 13 is detected. In the control method of the present embodiment, following the rotation detection, in step ST24, at time t155, the magnetic field detection pulse SP1 for detecting the AC magnetic field at the driving gate GP1 at time t155.
Is supplied, and the second detection of the low-frequency magnetic field is performed. When a magnetic field is detected by the second magnetic field detection pulse SP1, the process proceeds to step ST7, and at time t156, an auxiliary pulse P2 having a large effective power with a pulse width W20 is output, and further, at time t157.
Outputs a degaussing pulse PE.

Next, when the next cycle is started at time t161, a pulse SP0 for detecting the high-frequency magnetic field is output in the same manner as described above, followed by a pulse for detecting the AC magnetic field at time t162. SP1 is output. If no magnetic field is detected at this timing, the drive pulse P1 is supplied at time t163, and the rotation detection pulse SP2 is supplied at time t164. Further, subsequently, a second magnetic field detection pulse SP1 is output at time t165, no magnetic field is detected at this timing, and the rotation detection pulse SP2
If the rotation of the rotor has been detected, it is determined that the rotor has surely rotated, and this cycle ends.

In FIG. 11, the magnetic field detection pulse SP1 on the opposite pole side is output prior to the drive pulse P1, and the magnetic field detection pulse SP1 on the drive pole side is output following the rotation detection pulse SP2.
Is output to detect a noise magnetic field on the side that is likely to be erroneously detected during rotation detection. Of course, the magnetic field detection pulse SP1 on the drive pole side may be output first, and the magnetic field detection pulse SP1 on the opposite pole side may be output later. Alternatively, a magnetic field detection pulse SP1 having a different polarity is output first, and one magnetic pole or two magnetic field detection pulses SP1 having different polarities are output again after the rotation detection pulse SP2 to further increase the probability of detecting a magnetic field. It is also possible to

As described above, the timekeeping device 1 of the present embodiment improves the probability of magnetic field detection so that the magnetic field from the built-in power generator can be detected, and performs processing on the assumption that a magnetic field is present during power generation. The influence of the magnetic field from the power generation device in addition to the external magnetic field can be removed by a method such as the above method. As a result, it is possible to operate the hands with the degree of configuration even in a time-measuring device having a built-in power-generating device that performs irregular power generation, and it is possible to greatly improve the accuracy of a time-measuring device that can be used without a battery. In addition, the present invention is not limited to a time measuring device such as a wristwatch device, and it is needless to say that the present invention can be provided in a device having a built-in multifunctional timepiece such as a chronograph and other power generating devices and a stepping motor.

The driving pulse P1, the auxiliary pulse P2, and the magnetic field detection pulse SP0 described above are used.
Waveforms such as SP1 and SP1 and the rotation detection pulse SP2 are mere examples, and can of course be set in accordance with the characteristics of the stepping motor 10 employed in the timing device. Further, in the above example, the present invention has been described by taking a two-phase stepping motor suitable for a timing device as an example.
Of course, the present invention can be similarly applied to a stepping motor having more than two phases. Further, instead of performing control common to each phase, it is also possible to supply a drive pulse with a pulse width and timing suitable for each phase.
The driving method of the stepping motor is not limited to one-phase excitation, but may be two-phase excitation or 1-2-phase excitation.

[0079]

As described above, in the control method and the control device according to the present invention, the detection probability of the magnetic field is improved so that the magnetic field from the power generation device can be detected. It performs a process of supplying a drive pulse or an auxiliary pulse with a large effective power, and furthermore,
Once a magnetic field is detected, the same processing is performed assuming that there is a magnetic field from the power generation device. For this reason, by employing the control device and the control method of the present invention, it is possible to significantly suppress the influence of the magnetic field from the power generation device housed together with the stepping motor in the timekeeping device, etc. It is possible to provide a timekeeping device that can move hands with high accuracy anywhere without error.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a timing device in which a stepping motor and a power generation device according to the present invention are stored.

FIG. 2 is a diagram showing a schematic configuration of a detection circuit in a control circuit of the timing device shown in FIG. 1;

FIG. 3 is a diagram showing a state in which a charging voltage rises when a power generation device operates in the timekeeping device shown in FIG. 1;

FIG. 4 is a flowchart illustrating a control method of the control device according to the first embodiment of the present invention.

5 is a timing chart showing the operation of the control device shown in FIG.

FIG. 6 is a flowchart illustrating a control method of a control device according to a second embodiment of the present invention.

7 is a timing chart showing the operation of the control device shown in FIG.

FIG. 8 is a flowchart illustrating a control method of a control device according to a third embodiment of the present invention.

9 is a timing chart showing the operation of the control device shown in FIG.

FIG. 10 is a flowchart illustrating a control method of a control device according to a fourth embodiment of the present invention.

11 is a timing chart showing the operation of the control device shown in FIG.

FIG. 12 is a diagram showing a schematic configuration of a conventional clock device.

FIG. 13 is a diagram showing a schematic configuration of a detection circuit employed in the timing device shown in FIG. 12;

FIG. 14 is a timing chart showing the operation of a control device employed in the timing device shown in FIG.

15 is a flowchart showing a control method of the control device shown in FIG.

[Explanation of symbols]

 1, 9, timing device 10, stepping motor 11, driving coil 12, driving stator 13, driving rotor 20, control device 21, crystal oscillator 22, pulse synthesis circuit 23, control Circuit 24 Drive control circuit 24a Drive pulse supply unit 24b Rotation detection pulse supply unit 24c Magnetic field detection pulse supply unit 24d Auxiliary pulse supply unit 24e Demagnetization pulse supply unit 25 Detection circuit 26 ..Rotation judging unit 27..Magnetic field judging unit 30.Drive circuit 40.Electric power generator 41.Battery 42.Electric power generation stator 43.Electric power generation rotor 44.Electric power generation coil 45. Speed-up gear 47 Diode for rectification 48 Large-capacity capacitor 49 Step-up / step-down circuit 50 Wheel train 61 Second hand 62 minute hand 63 hour hand

Claims (21)

[Claims] 1. A power generating apparatus in which a power generating rotor rotates inside a power generating stator to generate electric power is operated by a kinetic energy transmitting means to generate electric power, and the electric power is supplied using the electric power supplied through a power storage means. A control device for a stepping motor capable of driving a multipolar magnetized driving rotor in a driving stator having a driving coil, wherein the driving coil supplies a driving pulse for driving the driving rotor to the driving coil. Drive means for supplying a rotation detection pulse for inducing an induced voltage for detecting rotation of the drive rotor following the drive pulse; and detecting an external magnetic field to the stepping motor prior to the drive pulse. Magnetic field detection means for supplying a magnetic field detection pulse for inducing an induced voltage for detecting a magnetic field, Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the induced voltages for rotation detection and magnetic field detection obtained with the respective set values, and the drive rotor does not rotate, or Auxiliary means for supplying an auxiliary pulse having a larger effective power than the driving pulse when an external magnetic field is detected, wherein the magnetic field detecting means detects the magnetic field in substantially the same frequency band with respect to the driving coil. A control device for a stepping motor, wherein the first and second magnetic field detection pulses having different polarities can be supplied prior to the drive pulse. 2. A power generating device in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and using the electric power supplied through a power storage means. A control device for a stepping motor capable of driving a multipolar magnetized driving rotor in a driving stator having a driving coil, wherein the driving coil supplies a driving pulse for driving the driving rotor to the driving coil. Drive means for supplying a rotation detection pulse for inducing an induced voltage for detecting rotation of the drive rotor following the drive pulse; and detecting an external magnetic field to the stepping motor prior to the drive pulse. Magnetic field detection means for supplying a magnetic field detection pulse for inducing an induced voltage for detecting a magnetic field, Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the induced voltages for rotation detection and magnetic field detection obtained with the respective set values, and the drive rotor does not rotate, or Auxiliary means for supplying an auxiliary pulse having a larger effective power than the drive pulse when an external magnetic field is detected, wherein the magnetic field detection means applies the magnetic field detection pulse to the drive coil before the drive pulse and A control device for a stepping motor, which can be supplied immediately after the rotation detection pulse. 3. A power generating apparatus in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and the electric power is supplied by using the electric power supplied through a power storing means. A control device for a stepping motor capable of driving a multipolar magnetized driving rotor in a driving stator having a driving coil, wherein the driving coil supplies a driving pulse for driving the driving rotor to the driving coil. Drive means for supplying a rotation detection pulse for inducing an induced voltage for detecting rotation of the drive rotor following the drive pulse; and detecting an external magnetic field to the stepping motor prior to the drive pulse. Magnetic field detection means for supplying a magnetic field detection pulse for inducing an induced voltage for detecting a magnetic field, Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the induced voltages for rotation detection and magnetic field detection obtained with the respective set values, and the drive rotor does not rotate, or Auxiliary means for supplying an auxiliary pulse having an effective power larger than the driving pulse when an external magnetic field is detected, wherein the determining means determines the induced voltage for detecting the magnetic field based on a charging voltage of the power storage means. A control device for a stepping motor, wherein the set value is adjustable. 4. A power generating device in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and using the electric power supplied through a power storage means. A control device for a stepping motor capable of driving a multipolar magnetized driving rotor in a driving stator having a driving coil, wherein the driving coil supplies a driving pulse for driving the driving rotor to the driving coil. Drive means for supplying a rotation detection pulse for inducing an induced voltage for detecting rotation of the drive rotor following the drive pulse; and detecting an external magnetic field to the stepping motor prior to the drive pulse. Magnetic field detection means for supplying a magnetic field detection pulse for inducing an induced voltage for detecting a magnetic field, Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the induced voltages for rotation detection and magnetic field detection obtained with the respective set values, and the drive rotor does not rotate, or Auxiliary means for supplying an auxiliary pulse having a larger effective power than the drive pulse when an external magnetic field is detected, wherein the auxiliary means supplies the auxiliary pulse when the power generator is generating power. Characteristic stepping motor control device. 5. A power generating device in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and using the electric power supplied via a power storage means. A control device for a stepping motor capable of driving a multipolar magnetized driving rotor in a driving stator having a driving coil, wherein the driving coil supplies a driving pulse for driving the driving rotor to the driving coil. And a short pulse supply unit for supplying a short pulse having a shorter cycle than the drive pulse to the drive coil, wherein the short pulse supply unit supplies the short pulse during power generation of the power generation device. A control device for a stepping motor, wherein the control is stopped. 6. The control device for a stepping motor according to claim 5, wherein the short pulse is at least one of a fast-forward pulse and a reverse rotation pulse. 7. A power generating device in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and the electric power is supplied using the electric power supplied through a power storage means. A control device for a stepping motor capable of driving a multi-polar magnetized driving rotor in a driving stator having a driving coil, the driving device comprising: a driving pulse for driving the driving rotor with respect to the driving coil. Driving means for supplying, a rotation detecting means for supplying a rotation detection pulse for inducing an induced voltage for detecting rotation of the driving rotor following the driving pulse, and an external magnetic field for the stepping motor prior to the driving pulse. Magnetic field detecting means for supplying a magnetic field detection pulse for inducing an induced voltage for detecting a magnetic field, the rotation detection pulse and the magnetic field detection pulse Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the obtained induced voltages for rotation detection and magnetic field detection with respective set values; and the drive rotor does not rotate, or the external Auxiliary means for supplying an auxiliary pulse having a larger effective power than the drive pulse when a magnetic field is detected, wherein the drive means can supply the drive pulse having a plurality of effective powers, and A control device for a stepping motor, wherein after the supply, at least one drive pulse having an effective power larger than the immediately preceding drive pulse is supplied. 8. A control device for a stepping motor according to claim 7, wherein said driving means can supply said driving pulses having different pulse widths. 9. The stepping motor control device according to claim 7, wherein said driving means is capable of supplying said driving pulses having different voltages. 10. A power generating apparatus in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and using the electric power supplied via a power storage means. A control device for a stepping motor capable of driving a multipolar magnetized driving rotor in a driving stator having a driving coil, wherein the driving coil supplies a driving pulse for driving the driving rotor to the driving coil. Drive means for supplying a rotation detection pulse for inducing an induced voltage for detecting rotation of the drive rotor following the drive pulse; and detecting an external magnetic field to the stepping motor prior to the drive pulse. Magnetic field detection means for supplying a magnetic field detection pulse for inducing an induced voltage for detecting a magnetic field to be detected, and the rotation detection pulse and the magnetic field detection pulse Determining means for determining the presence or absence of rotation and the presence or absence of a magnetic field by comparing the obtained induced voltages for rotation detection and magnetic field detection with respective set values; and the drive rotor does not rotate, or the external An auxiliary means for supplying an auxiliary pulse having a larger effective power than the drive pulse when a magnetic field is detected; and a degaussing means for supplying a degaussing pulse having a different polarity from the auxiliary pulse for degaussing following the auxiliary pulse. The degaussing means supplies the degaussing pulse immediately before the driving pulse supplied following the auxiliary pulse. 11. A power generating device in which a power generating rotor rotates inside a power generating stator to generate power is operated by kinetic energy transmitting means to generate electric power, and using the electric power supplied via a power storage means. A method for controlling a stepping motor capable of driving a multi-pole magnetized driving rotor in a driving stator having a driving coil, comprising: A driving step of supplying a rotation detection pulse to the drive coil following the drive pulse, and a rotation detection step of comparing the induced voltage with a first set value to detect whether or not rotation is possible; Prior to this, a magnetic field detection pulse for detecting an external magnetic field for the stepping motor is output to the drive coil, and the induced voltage is compared with a second set value to detect a magnetic field. A magnetic field detection step, and an auxiliary step of supplying an auxiliary pulse having a larger effective power than the drive pulse when the driving rotor does not rotate or when the external magnetic field is detected, A step of outputting the magnetic field detection pulses having different polarities to the drive coil in order to detect a magnetic field in substantially the same frequency band. 12. A power generating apparatus in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and using the electric power supplied through a power storage means. A method of controlling a stepping motor capable of driving a multi-pole magnetized driving rotor to rotate within a driving stator having a driving coil, comprising: a driving pulse for driving the driving rotor with respect to the driving coil. A driving step of supplying a rotation detection pulse to the drive coil following the drive pulse, and a rotation detection step of comparing the induced voltage with a first set value to detect whether or not rotation is possible; Prior to this, a magnetic field detection pulse for detecting an external magnetic field for the stepping motor is output to the drive coil, and the induced voltage is compared with a second set value to detect a magnetic field. Outputting a magnetic field detection pulse for detecting an external magnetic field to the stepping motor to the drive coil following the rotation detection pulse, and comparing the induced voltage with a second set value to detect the magnetic field. A second magnetic field detecting step of performing the following, and an auxiliary step of supplying an auxiliary pulse having a larger effective power than the driving pulse when the driving rotor does not rotate or the external magnetic field is detected. Characteristic stepping motor control method. 13. A power generating device in which a power generating rotor rotates inside a power generating stator to generate electric power is operated by a kinetic energy transmitting means to generate electric power, and the electric power is supplied using the electric power supplied through a power storage means. A method for controlling a stepping motor capable of driving a multi-polar magnetized driving rotor in a driving stator having a driving coil, comprising supplying a driving pulse to the driving coil to drive the driving rotor. A drive detection step of outputting a rotation detection pulse to the drive coil following the drive pulse, and comparing the induced voltage with a first set value to detect whether or not rotation is possible; And outputs a magnetic field detection pulse for detecting an external magnetic field to the stepping motor to the drive coil, and compares the induced voltage with a second set value to perform magnetic field detection. A magnetic field detecting step, and an auxiliary step of supplying an auxiliary pulse having a larger effective power than the driving pulse when the driving rotor does not rotate or when the external magnetic field is detected. And a step of controlling the stepping motor, wherein the second set value can be adjusted by a charging voltage of the power storage means. 14. A power generation device in which a power generation rotor rotates inside a power generation stator to generate power is operated by kinetic energy transmission means to generate electric power, and uses the electric power supplied via a power storage means. A method for controlling a stepping motor capable of driving a multi-polar magnetized driving rotor in a driving stator having a driving coil, comprising supplying a driving pulse to the driving coil to drive the driving rotor. A drive detection step of outputting a rotation detection pulse to the drive coil following the drive pulse, and comparing the induced voltage with a first set value to detect whether or not rotation is possible; And outputs a magnetic field detection pulse for detecting an external magnetic field to the stepping motor to the drive coil, and compares the induced voltage with a second set value to perform magnetic field detection. A magnetic field detecting step, and an auxiliary step of supplying an auxiliary pulse having a larger effective power than the driving pulse when the driving rotor does not rotate or when the external magnetic field is detected. The method of controlling a stepping motor, wherein the auxiliary pulse is supplied during power generation of the power generation device. 15. A power generating apparatus in which a power generating rotor rotates inside a power generating stator to generate power by operating a kinetic energy transmitting means to generate electric power, and using the electric power supplied through a power storage means. A method for controlling a stepping motor capable of driving a multi-polar magnetized driving rotor in a driving stator having a driving coil, comprising supplying a driving pulse to the driving coil to drive the driving rotor. A short pulse supply step of supplying a short pulse having a shorter cycle than the drive pulse to the drive coil. In the short pulse supply step, the short pulse is supplied during power generation by the power generation device. And stopping the stepping motor. 16. The method according to claim 15, wherein the short pulse is at least one of a fast-forward pulse and a reverse rotation pulse. 17. A power generating device in which a power generating rotor rotates inside a power generating stator to generate power is operated by a kinetic energy transmitting means to generate electric power, and the electric power is supplied using the electric power supplied through a power storage means. A method of controlling a stepping motor capable of driving a multipolar magnetized driving rotor to rotate within a driving stator having a driving coil, comprising: a driving pulse for driving the driving rotor with respect to the driving coil. A driving step of supplying a rotation detection pulse to the drive coil following the drive pulse, and a rotation detection step of comparing the induced voltage with a first set value to detect whether or not rotation is possible; Prior to this, a magnetic field detection pulse for detecting an external magnetic field for the stepping motor is output to the drive coil, and the induced voltage is compared with a second set value to detect a magnetic field. A magnetic field detecting step, wherein the driving rotor does not rotate, or an auxiliary step of supplying an auxiliary pulse having a larger effective power than the driving pulse when the external magnetic field is detected, and the auxiliary pulse is supplied. A step of supplying at least one drive pulse having an effective power larger than that of the immediately preceding drive pulse. 18. The stepping motor control method according to claim 17, wherein the driving pulse having a large pulse width is supplied in the second driving step. 19. The stepping motor control method according to claim 17, wherein the driving pulse having a large voltage is supplied in the second driving step. 20. A power generation device in which a power generation rotor rotates inside a power generation stator to generate power is operated by kinetic energy transmission means to generate electric power, and uses the electric power supplied via a power storage means. A method for controlling a stepping motor capable of driving a multi-polar magnetized driving rotor in a driving stator having a driving coil, comprising supplying a driving pulse to the driving coil to drive the driving rotor. A drive detection step of outputting a rotation detection pulse to the drive coil following the drive pulse, and comparing the induced voltage with a first set value to detect whether or not rotation is possible; And outputs a magnetic field detection pulse for detecting an external magnetic field to the stepping motor to the drive coil, and compares the induced voltage with a second set value to perform magnetic field detection. A magnetic field detecting step; an auxiliary step of supplying an auxiliary pulse having a larger effective power than the driving pulse when the driving rotor does not rotate or the external magnetic field is detected; A degaussing step of supplying a degaussing pulse having a polarity different from that of the auxiliary pulse. In the degaussing step, the degaussing pulse is supplied immediately before a driving pulse supplied following the auxiliary pulse. Stepping motor control method. 21. A stepping motor control device according to claim 1, wherein the stepping motor moves a clock hand by the driving pulse; and a pulse synthesizing unit that outputs pulse signals of a plurality of frequencies. A timing device comprising: the power generation device.