JPS62189988A - Rotation detector - Google Patents

Abstract

PURPOSE:To reduce a necessary space and miniaturize devices by controlling rotational speed and phase of rotational parts using one detecting mechanism. CONSTITUTION:One magnetic head 24 is arranged near a multi-pole magnet ring 23. Signal 24a detected by the magnetic head 24 is divided into two systems, and one is inputted to a first monostable multivibrator 25 and other is inputted to a second monostable multi vibrator 28. Pulse 27a from AND circuit 27 is inputted to one input end of a phase comparator 9, and reference signal from a reference signal generator 3 is supplied to other input end of the phase comparator 9. The phase control signal 9a is introduced together with rotational speed control signal 8a from a speed detector 8 into an adder 10, output of the adder 10 is applied through a motor control circuit 2 to a motor 1.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a signal for precisely controlling the rotation of a rotating part of a device driven by a rotating actuator such as a motor. This relates to a rotation detection device that detects M.

(Prior Art) In electronic equipment such as a video chip player and a video player, the rotational state of a rotating part driven by a rotary actuator of a seven-point tongue is recorded on a recording medium as a signal. Test 1 [1 related to performance! Therefore, controlling the rotation (including the rotational speed J3 and rotational phase) of this rotating section becomes a very important problem. For example, video-i
A rotary cylinder in which a bidet sub-head is taken is rotated in the cylinder tanabata mode, and the recording section is operated so that the rotation of the head is synchronized with the vertical synchronization signal of the recorder A signal. During playback, the rotation of the head is controlled in synchronization with the output of the reference signal generator.

Figure 5 shows an example of such a control system, where 1 is a motor, 2
3 is a motor drive circuit, 3 is a reference signal generator, and the motor 1 has two disk-shaped rotors 4 and 5 that rotate according to the rotation of the respective shafts, and each rotor 4 and 5 are disposed close to each other. and rotor 4,
A rotational speed detection stage consisting of a detection body 6.7 which detects the rotational speed and rotational phase of the motor 1 by detecting the rotation of the motor 5. Detector 6 outputs a rotation speed trace detection signal 1G that indicates the rotation speed of motor 1, and detects the rotation speed of motor 1. J: The sea urchin is turning.

The frequency of the rotational speed detection signal "G" is detected by the speed detector 8 and becomes the rotational speed control signal 8a, which is input to the motor drive circuit 3 via the adder 10 and becomes a signal for controlling the rotational speed of the motor 1. .On the other hand, the rotational phase detection signal P
G is input to one input terminal of the phase comparator 9.
The (C! phase difference is compared with the reference signal from the reference signal generator 3 supplied to the input terminal of the
Rotational phase system 611 according to the phase difference of Ryojinni (,”
:Exit bow 9a) jl! , Shimeru.

This rotational phase detection mechanism 9a manually inputs a signal to an adder 10 as a signal to control the rotational phase of the motor 1, and
Tanabata 1 is controlled through. That is, the loop consisting of the detection object 6 -> speed detector 8 -) adder 10 -> motor drive circuit 2 -> motor 1 forms a speed control loop, and the detection object 7
, i, L base A J1 generator 3→phase comparator 9→adjuster 10-1 [--inverter drive circuit 2→=[--The loop consisting of 1 constitutes a phase control loop.

In addition, when the control system shown in FIG. It is configured to oscillate when the phase is opened, and to oscillate a signal of 30 H7 during playback.

FIG. 6 shows a conventional known mechanism used for rotational speed detection.

This rotational speed detection mechanism is Nl51. N252. A flat multipolar magnet ring 11 in which small fan-shaped magnets are arranged in an annular shape at equal intervals, and a magnetic flux detection pattern 12 (conductor pattern) is formed to match the width of this ring, and this pattern part is attached to the annular part. circular plates 13 arranged close to each other and facing each other;
The multipolar magnet 11 corresponds to the rotating body 4, and the magnetic flux detection pattern 12 of the circular plate 1 corresponds to the detecting body 6. This detection mechanism uses the induced voltage generated at both ends 12a and 12b of the magnetic flux detection pattern 12 due to the change in magnetic flux caused by the rotation of the multipolar magnet ring 11 side as the rotation speed 1 detection signal @FG. be. Note that the center of the multipolar magnet ring 11 coincides with the center of the pattern of plays 1-13.

FIG. 7 shows an example of a rotor speed detection mechanism in which a multipolar magnet ring 14 is used as the rotor 4, which has an arc plate shape and is made up of many small magnets of the same size. A magnetic head 15 is used, and a rotation speed detection signal FG is derived from output terminals 15a and 15b of the magnetic head 15 by rotation of a multipolar magnet ring 14.

On the other hand, the rotational phase detection mechanism is known to have the configuration shown in FIG. .

FIG. 8 shows that the rotor 5 is constructed by placing one magnet 1-17 at a predetermined position of the circular brakes 1-16, and another circular plate 1 disposed adjacent to the circular plate 16.
The magnetic flux change caused by the rotation of the magnet 17 is picked up by a single coil No. 8, and a rotational phase detection signal PG is generated between both terminals 19a and 19b of the coil 19.

In this way, the mechanism for detecting rotational speed and the mechanism for detecting rotational phase are structurally different, and when used in a control system as shown in Figure 5, two types of detection elements for 48'jj are required. Since it has to be arranged inside the motor or around the motor, there is a drawback that the motor itself or the surrounding structure becomes a puppet.

(Problems to be solved by the invention) In the conventional technology, a rotational speed detection mechanism and a rotational phase detection mechanism are separately provided along the same axis of the motor, and the rotational speed a3 and phase control are Therefore, it is necessary to reduce the space required and make the applicable equipment more compact.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned problems and to provide a rotation detection device capable of controlling and controlling the rotational speed and phase of a rotating part with a single mechanism and detecting an overriding signal.

[Structure of the Invention] (Means for Solving the Problems) The present invention detects the rotation of noise rotated by a rotary actuator as a signal consisting of first and second signals having different periods by a detection body. a rotor, a first signal generation means for outputting a signal for speed control based on a first signal component of the detection signal from the detection object, and a first signal for the detection signal. and a second signal generating means for extracting the 1' cycle component of the second signal from the output signal of the generating means and using it as the rotational phase detection signal of the rotational rotation phase 1=evening to overturn the C output. There is.

(Function) In the rotation detecting device of the present invention, the detection signal from the object to be detected by the C1 rotor is the first signal that rotates to the right of a predetermined circle III during rotation rotation: 1-L to 1 rotation. The second cycle (Jl' = z included /v'C) occurs only during a period corresponding to one cycle of the first signal.Therefore, from the rotor, the rotation During this time, for example, the second signal for two cycles will be included.Then, this detection signal is input to the first signal generating means, and then the second signal is input to this means. Regardless, it is converted into a signal with the same period as the first signal and [“iI!
1/; Speed 1 corridor control control signal 8 is 1! do. Furthermore, this first signal (signal from the first signal generating means) and the detection signal are inputted to the second signal generating stage f, and the fact that the periods of the two human input signals are different during the signal period of the second signal is utilized. The second Nizuki no ゛1
The signal generated by the generating means C is used as a control signal for the rotational phase.

(Example) The present invention will now be described with reference to the illustrated embodiments.

FIG. 1 is a block circuit diagram showing one embodiment of a rotation detection device according to the present invention.

In FIG. 1, parts that perform the same functions as those in FIG.
A rotor 22 included in the rotor 22 is coaxially connected to the rotary unit 11 of the top and bottom 1, and accommodates a multipolar magnet ring 23 of the opening 11, which will be explained in detail in FIG. This embodiment includes this multipolar magnet 1-ring 23 and this multipolar magnet ring 2.
One magnetic head 2/I placed close to 3 is covered to obtain a rotational phase control signal and a rotational phase control signal. The size of any two (11th place magnets 1~) is smaller than the other unit magnets 1~, and while the rotor 22 rotates once, from the multipolar magnet ring 23,
It is unique that the period of the signal equal to 2'' noise is detected as long as the period J:λ0 of the other periods (,'''i).

That is, I5, the signal 24a detected by the magnetic head 24 is outputted as a rectangular wave by a waveform shaping means (not shown).
It is further divided into two systems, one of which is input to the first L11 stabilized valve vibrator 25, and the other is input to the second monostable multivibrator 28. The pulse generation period of the first monostable multivibrator 25 is longer than that of the second monostable multivibrator 28J.・Jin5 detected in (
The period J (hereinafter referred to as a signal with a short rectangular interval) is very large. and a first monostable multivibrator 25
The output 25E of
8a is connected to the other input terminal of the AND circuit 27.

The AND circuit 27 serves to extract a pulse 27a corresponding to a signal with a short rectangular interval from the signal 53 from the second monostable multivibrator 28, and this pulse 27a, C; 1 phase. It is input to one input terminal of the comparator 9. A reference signal generator 3 is connected to the other input terminal of the phase comparator 9.
The phase comparator 3 compares the raw phase of the pulse 27a with the phase of the reference signal and outputs the phase control signal 9a.
This signal 9a is introduced into the other end of an adder 10, one end of which is supplied with the rotational speed control signal 8a from the speed detector 8. The output of the adder 10 is applied to the motor 1 via the motor drive circuit 2.

FIG. 2 is an explanatory diagram illustrating in detail the configuration of the rotation detection means 21 according to the present embodiment, in which (a) shows the outline in perspective, and (b)
) is a plan view of (a). In the following explanation, the number of unit magnets constituting the multipolar magnet ring 23 is assumed to be six, but of course this number is not limited, and may be determined according to the detection ability of the magnetic head 24 or the rotational speed of the rotating part of the applied equipment. Can be set up individually. It is clear from these figures that the J: Uni multipolar magnet ring 23 consists of six unit magnets NI
Sl, N282, N383, N484
, N5S5, N6 Among S6, N585, N6
86 is another unit magnet with a shorter length in the annular direction. In this case, the lengths of N585 and N686 are approximately half of the other lengths, so that the signals 211 . a is N151~
The rectangular interval of the signal g detected by the magnetic flux of N4 S4 is twice the rectangular interval of the signal detected by N535 and N6 S6.

The rotation detecting means 21 according to this embodiment is constructed as described above, and its operation will next be explained with reference to FIG. 3.

FIG. 3 shows the time chart of the signals appearing in each part of FIG.
(B) is the output 25a1 of the first monostable multivibrator 25, (C) is the output 26 of the delay device 26.
a, (D) is the output 28E1 of the second monostable multivibrator 28, and (E) is the output 27a of the AND circuit 27.

The signal 24a detected by the magnetic head 24 is shown in FIG.
As shown in , a rectangular wave t5. in which one cycle is formed in unit magnets 1 to @. The recycle or short interval signals corresponding to N5S5J5 and N6S6 are
It can be seen that the Nil signal (hereinafter referred to as a long period signal) corresponding to Nil S4 is approximately one-half.

Now, since the first monostable multivibrator 25 is set so that the pulse generation interval wI (time constant) matches a long period signal, the first monostable multivibrator 25 generates a pulse in the first cycle of a short period signal consisting of two cycles. Triggered by PS5,
The signal that is not triggered by the next pulse PS6, that is, has a short period, is frequency-divided by the first monostable multi-by-break 25.

As a result, the first monostable multivibrator 25 outputs a rectangular wave signal (25a) whose period matches the long period signal. This output 25a is the same as the case of FIG.
The rotational speed control signal 8a, which is the detected output, is input to the speed detector 8 as G, and the rotational speed control signal 8a, which is the detected output, controls the speed of the dryer 1 via the motor drive circuit 2.

Next, the second monostable multivibrator 28 has a pulse width of The time constant is set to generate a pulse. Therefore, the second monostable multi-by-break 28 generates a pulse Ps of the signal 24a.
i, PS2゜PS3. PS4. PS5. PS6
The output 28E1 is triggered by the rising edge h(ri) and inverted according to the time constant, and the output 28E1 is the pulse 21 to 28E1 shown in FIG. 3(D).
There are 26 columns of signals. Here, Pl is psi, P2 is PS2, P3 is PS3, P4 is PS4, P5 is PS
5 and P6 correspond to PS6, respectively. On the other hand, the signal 26a that has passed through the H extender 26 is as shown in FIG. 3(C).
Since the low level period (non-pulse period) matches the remaining pulses P1 to P5 excluding the pulse P6 in FIG. 3(D), these signals (C) and (+)) are input to the AND circuit 27. Then, the AND circuit 27 outputs the pulse P6.
A signal with only the extracted signal is output. The output 27a of the AND circuit 27 is a pulse generated in response to one rotation of the rotor 22, and is output to the circuit shown in FIG. It is something that will be done. In other words, the pulse P6 is equivalent to the signal that detects the boundary between N5 and 86 of the multipolar magnet ring 23. , L/+: Therefore, by comparing the phase of this signal -\'i 27 a with the reference signal, the rotational phase of the motor 1 is controlled (,:'i).

In this way, the present invention can control the rotational speed, J, and phase of the rotation of the equipment to be appropriately controlled by the rotary unit.

FIG. 4 shows another principle configuration of the rotation detecting means 21 according to the present invention, in which light is used as the detection medium. Rotor 22
The annular plays 1 to 29, which correspond to 2 slits 1 to 31.31 are formed, and the first slit 30 is the second slit 30.
The length of the sleeve l=, 31 is approximately one-half. still,
A perforated portion 32, 32, . Then, light emitting elements (e.g., light emitting diodes) 33 and J and light receiving elements (e.g., A1 to transistors) 3/1 are arranged with the open ring plate 1-29 sandwiched therebetween. According to this configuration, the light receiving element 34J receives a signal 1q corresponding to FIG. Figure 3 (
D).

It is possible to generate 41 pulses corresponding to P6 shown in ().This optical means is effective when magnetic detection cannot be used.

The above embodiment is merely an example of the present invention, and various modifications may be made without departing from the scope of the claims.For example, the delay device may be interposed on the second instep stable multi-vibrator side. good.

Effects of the Invention J As explained above, according to the present invention, the phase detection signal is 1! The detection means for detecting the speed detection signal "i" and the detection means for detecting the speed detection signal "i" are each independently 1.5, 1
This has the effect of making it possible to obtain 11) data from both detection mechanisms C.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the rotation detection device according to the present invention.
2 is a circuit diagram, FIG. 2 is an explanatory diagram explaining in detail an example of the rotation detection means used in the embodiments described above, FIG. 3 is a time plate explaining the operation of FIG. 1, and FIG. An explanatory diagram showing another example, Fig. 5 An explanatory diagram for explaining the conventional rotation detecting means used in the control system to which the present invention is applied, Figs. 6 to 8 show the conventional rotation detecting means FIG. 3 is an explanatory diagram showing various examples of means. 1... Motor 21... Rotation detection means, 2
2... Rotor, 23... Multipolar magnetic screw 1 to ring, 2/I... Sensing object, 25... First monostable multivibrator, 27...
・AND circuit, 26...Delay device, 28...Second monostable multivibrator, agent Hiroshi Uji Figure 5 Figure 7 19b Figure 8

Claims (1)

[Claims] A rotor that rotates by rotation of a rotary actuator;
A rotation detection device including a detection body provided corresponding to the rotor and configured to detect rotation of the rotor and derive a detection signal for controlling rotation of the actuator, wherein the rotor and the detection body are The control signal derived from the detection object during one rotation of the rotary actuator generates a first signal having a predetermined period and a plurality of cycles only during a period corresponding to one period of the first signal. and a second signal having a different period from the signal,
Further, a first signal generating means converts all of the detection signals into signals having the same period as the first signal regardless of the second signal, and outputs this as a rotation speed detection signal of the rotary actuator; second signal generation means for extracting a half-cycle component of the second signal from the detection signal and the output signal of the first signal generation means and outputting it as a rotational phase detection signal of the rotary actuator; A rotation detection device characterized by comprising: