KR900003440Y1 - Generator of rotation signal - Google Patents

Abstract

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Description

Rotation signal generator

1 is a block diagram showing an embodiment of a rotation signal generator according to the present invention.

2 is a waveform diagram of each signal for explaining the operation of the rotation signal generator shown in FIG.

* Explanation of symbols for main parts of the drawings

1: rotation signal generator 2: magnet ring

3: HO element 4: Differential amplifier circuit

5: first non-church 6: anti-amplification circuit

7: 2nd Non-church 8: End

So: Normal output signal So: Reversed phase output signal

V ₁ : first output signal V ₂ : second output signal

TS: Timing signal RS: Reference position information signal

The present invention relates to a rotation signal generator for detecting a change in magnetic flux generated in the vicinity of rotating a rotating body formed by providing a plurality of magnetic poles and thus outputting a rotating signal representing the rotating information of the rotating body.

Conventionally, various rotation signal generators have been proposed to magnetize a plurality of magnetic poles around a disk-shaped rotating member and obtain a desired rotation information signal through a magnetic sensor arranged near the charged member. It is.

The conventional apparatus of this kind has a magnetic sensor in an alternating magnetic field generated by magnetizing a large number of N poles and S poles at regular equiangular intervals on the outer circumferential surface of the magnet ring, for example. The signal is converted into an AC signal having the same period as that of the AC magnetic field, and the AC signal is converted into a reference signal of a predetermined constant level. It is supposed to get as.

Therefore, according to the conventional structure described above, one pulse is output as an angle information pulse by magnetic poles of two different polarities adjacent to each other magnetized in the magnet ring. (See Japanese Patent Application Laid-Open No. 56-33515, for example).

However, in such an information generating apparatus, it is often desired to output a reference position information pulse indicating that the rotation has reached a constant rotation position in addition to the angular information pulse indicating that the rotating body has rotated only a predetermined angle.

In order to meet such demands, a part of the rotating body is conventionally dropped. Or by shortening the interval between the magnetic poles of the parts with respect to the reference position, generating a change in the time interval of the generation of the angular information pulse signal when the rotor reaches a certain reference position. It is known for a configuration to obtain a desired pseudo positional information pulse upon detection. (See publications 56-33515 and see publications 56-7013.).

However, since the conventional configuration is to detect the excretion interval of the magnetic pole provided in the rotating body by measuring the time interval of occurrence of the angular pulse, it is possible to accurately obtain the reference position information pulse when the angular velocity of the rotating body changes abruptly. At the same time, there is a problem of not being able to obtain a signal representing all the transition timings of the stimulus.

For this reason, when generating M angular information pulses per unit rotation angle, 2M magnetic poles were required per unit rotation angle, and as the value of M increased, it was difficult to excrete magnetic poles.

Furthermore, if the interval length of the stimulus is shortened, the amount of magnetization per one stimulus decreases, and the level of the output signal from the sensor tends to decrease, and the noise margin decreases, making it more susceptible to foreign noises. Was made.

In addition, in order to eliminate this inconvenience, the diameter of the rotating body has to be increased, resulting in other problems.

It is an object of the present invention to provide a rotation signal generator capable of generating a pulse accurately indicating the prepared switching timing of a magnetic pole since the desired reference position information pulse can be surely obtained in spite of a change in the angular velocity of the rotating body of the magnetic pole.

The subject matter of the present invention for achieving the above object is a rotational body having a constant magnetic pole arrangement pattern with different magnetic pole placement patterns only at a reference position that is provided at the same interval alternately on the one pole and the other pole Detecting means for outputting a detection signal according to the change in response to a change in the magnetic field generated in the vicinity of the rotating body when the rotating body is rotated, and a level comparison path having hysteresis characteristics in the level comparing operation. Comparing the call with the first reference level and outputting a first output signal which is brought to a predetermined level change state at all timings in which the state of the magnetic field described above is shifted under the influence of the other magnetic pole under the influence of the magnetic pole described above; The first reference level includes a level comparison path having hysteresis characteristics in the level comparison operation, and the second reference level described above and different from the first reference level. The above-mentioned predetermined level change state in the timing at which the state of the magnetic field other than the magnetic field generated by the magnetic poles arranged at narrow intervals by comparing the detection signals is shifted under the influence of the other magnetic pole described above under the influence of the other magnetic pole described above Second means for outputting a second output signal, and first output means for outputting a first pulse signal indicating a predetermined level change state timing described above in response to the first and second output signals described above; It is characterized in that it is provided with a second output means for outputting a second pulse signal indicative of the timing of the reference position required in response to the signal and the second output signal.

The change of the magnetic field generated by the rotation of the rotating body is detected by the detecting means, and in response to the detection signal from the detecting means, the state of the magnetic field is different from the other means under the influence of the other magnetic pole (for example, N pole). A first output signal representing all timings shifted under the influence of the bias stimulus (eg S pole) is output.

On the other hand, from the second means, in response to the detection signal, a second output signal indicating the timing at which the state of the magnetic field is shifted under the influence of the other magnetic pole (for example, the N pole) under the influence of the other magnetic pole (for example, the N pole) is output. .

The second reference level for obtaining the second output signal is set so that only the timing at which the state of the magnetic field other than the magnetic field generated by the magnetic poles arranged at different intervals moves under the influence of the N pole under the influence of the N pole is obtained. 2 The output signal becomes irrelevant to the change in the magnetic poles caused by the magnetic poles arranged at narrow intervals.

The first output means is a pulse generated in response to each timing at which the state of the magnetic field is shifted under the influence of the north pole and the south pole in response to the first and second output signals and at each timing shifted under the influence of the north pole at the south pole. The first pulse signal to be outputted.

As a result, the rotating body can output the same number of pulses as the magnetic pole provided in the one rotating body, for example.

The second output means outputs a second pulse signal indicating a timing at which the rotor reaches a predetermined reference position in response to the first pulse signal and the second output signal.

1 is a block diagram of an embodiment of a rotation signal generator according to the present invention.

The rotation signal generator 1 has a predetermined magnetic pattern in which the N and S poles are magnetized at equal intervals alternately in the circumferential direction, so that the magnetization interval becomes narrow only near the predetermined reference position R, which is predetermined. The magnet ring 2 and the hool element 3 which is a magnetic sensitive element arrange | positioned in the vicinity of this magnet ring 2 are provided.

The magnet ring 2 is connected to a rotating shaft of a rotating device such as, for example, an internal combustion engine or an electric motor, and rotates in the direction of an arrow A in accordance with the rotation of the rotating shaft.

In the illustrated embodiment, the magnet pole 2 has the magnets S and N poles alternately magnetized at intervals of 10 °, and at an angle of 5 ° between the S and N poles in the range of 20 ° before the reference position (R). It is magnetized.

Therefore, the magnetization amount of each magnetic pole magnetized at 5 ° intervals is about half that of the other magnetic poles.

The change in itself near the rotation of the magnet ring 2 is converted into an electric signal of level change corresponding to the change in the magnetic field according to the arc element 3 to which the DC power supply voltage + V is applied. Since the intensity of the magnetic field generated by the magnetic poles magnetized at intervals becomes smaller in correspondence with the magnetization amount, the level of the electric signal changed in response to the change in the magnetic field generated by this portion becomes smaller in correspondence with the magnetization amount.

FIG. 2 (a) shows the arrangement of magnetic poles when the magnet ring 2 is deployed in a straight line. The magnetic pole 2 is normally moved when the hohol element 3 is relatively moved following these magnetic poles. The normal output signal Sa shown in Fig. 2 (b) is output from the output terminal 3a, and the reverse phase output signal Sb shown in Fig. 2c is output from the reverse phase output terminal 3b. It is.

The normal and reverse phase output signals Sa and Sb are input to the differential amplifier circuit 4 consisting of an operational amplifier 41, an input resistor 42 and a feedback resistor 43.

The normal output signal Sa is input to the inverting input terminal of the operational amplifier 41 via the input resistor 42, and the reverse phase output signal Sb is directly input to the non-inverting input terminal.

Therefore, the amplified output signal So shown in Fig. 2d can be obtained from the output terminal of the operational amplifier 41.

The amplified output signal So is input to the inverting input terminal of the voltage comparator 51 of the first non-inverter 5, and the non-inverting input terminal is provided with resistors 52 and 53 for dividing the DC power supply voltage + V. The first output voltage V, which is the output voltage of the voltage comparator 51, is applied only when the potential Vx of the connection point X of the X is applied as the reference voltage and the level of the amplification output signal So is greater than the potential Vx. ₁ ) becomes "L".

Since the comparison operation of the voltage comparator 51 gives hysteresis characteristics, another feedback circuit is connected between the output terminal and the non-inverting input terminal by the diode 54 and the variable resistor 55, and the first output voltage (V). ₁₎ the level of the electric potential (Vx), depending on the level of the is configured to change as indicated by a broken line in FIG (d).

That is, the size of In the first output voltage because the level of (V ₁₎ is in "H" diode 54 and is in a forward bias state, the electric potential (Vx) to the state of a while ago than a time t = ta the resistor ( 52), which is appointed only by the 53 keungap (Vx ₁₎ than the potential of the X point (Vox) is a.

When t> ta and the level of the amplification output signal So becomes greater than the potential Vx ₁ , the level of the first output voltage V ₁ becomes L and the diode 54 becomes a reverse biased state. = Vx ₀ .

Here, the value Vx ₁ is greater than the peak value Vm ₁ of the amplified output signal So generated by the magnetic poles provided at 5 ° intervals, and the amplified output signal So generated by the magnetic poles provided at 10 ° intervals. ) and the set is smaller than the peak value (Vm _2).

Moreover, resistor 56 is a pull-up resistor.

As a result of the change in the potential Vx as described above, the level of the first output voltage V ₁ changes as shown in FIG.

That is, as can be seen from FIG. 2 (e), the first output voltage V ₁ is obtained by the tie nets t ₁ , where the hoist element 3 is moved under the influence of the S pole under the influence of the N pole. t ₇ ). … Although the level is a signal that changes from "L" to "H", the level change does not occur at t ₃ and t ₅ for the reasons described above.

The amplifying output signal So is also provided with an operational amplifier 62, a resistor 62, a 64 and a variable resistor 65 to obtain an inverted amplified output signal So different from the amplified output signal So by only 180 °. The inverted amplifier circuit 6 is inputted to the inverted amplifier circuit 6, which is formed as follows, and is inputted to the inverted amplifier circuit 6, and the inverted amplifier output signal So shown in FIG.

The inverted amplification output signal So is input to the second non-intersection 7 configured like the first non-intersection 5, where all the timings at which the hoist element 3 changes under the influence of the pole under the influence of the N pole. (t ₂ ), (t ₄ ), (t ₆ ). … The second output voltage V ₂ (refer to FIG. 2 (g)) whose level changes from "L" to "H" is output.

The second non-integrating furnace 7 is composed of a voltage comparator 71, resistors 72 and 73, and a feedback circuit consisting of a diode 74 and a variable resistor 75, and the like (72) and (73). The potential of this connection point Y, i.e., the potential Vv of the non-inverting input terminal of the voltage comparator 71, is represented by a dotted line in Fig. 2 (f) according to the level of the output terminal of the voltage comparator 71. Change.

Here, Vyo is the value of the potential Vv when the diode 74 is in the reverse bias state, Vv ₁ is the potential 74 when the backwood 74 is in the forward bias state. It is the value of the potential Vv when it becomes.

As seen from FIG. 2 (f), the value Vv ₁ is determined to be slightly smaller than the peak value Vm ₁ of the inverted amplified output signal So generated by the magnetic poles provided at intervals of 5 °. The output voltage (V ₂ ) is defined by all timings (t ₂ ), (t ₄ ), (t ₆ )... Which are converted by the arc element 3 under the influence of the N pole. … Is a signal whose level changes from "L" to "H".

The first and second output voltages V ₁ and V ₂ are input to an end circuit 8 made of diodes 81, 82 and a resistor 83, and the like. The angle information signal TS, which becomes the "H" level, is output only when the respective levels of V ₁ ) and (V ₂ ) become "H" together. (See Figure 2 (h)).

As a result, a pulse signal made of a pulse which is output every time the magnet ring 2 rotates by 10 degrees is output as the angle information signal TS.

The rotation signal generator 1 according to the present invention also operates in response to the angle information signal TS and the first output signal V ₁ to output the reference position information signal RS representing the reference position R. The reference signal generation circuit 9 is provided.

The reference signal generating circuit 9 is an inverter 91, a binary counter 92 and an end circuit 93, and the first output voltage V ₁ is level inverted by the inverter 91. The resulting inverted first output voltage V ₁ (see FIG. 2 (i)) is input to the return terminal RES of the binary counter 92, while the angle information signal TS is inputted to the binary counter ( 92 is input to the clock terminal CLK.

The binary counter 92 is inverted first output voltage (V _1), the angle information for which is to return the state while it is "H" level, inverting the first output voltage (V ₁₎ is set to "L" level Each time the signal TS falls, the count increases by one.

Binary least significant bit of the counter (91) (bit) output (Q ₁₎ and the second bit output (Q ₂₎ has end St is input to 93, and the AND gate 93 outputs the reference position information signal (RS of Is output as

Next, the operation of the reference signal generation circuit 9 will be described.

It is known that the inverting first output signal V ₁ is at the "H" level, as shown in FIGS. 2D and i, in which the arc element 3 faces the N pole provided at 10 ° intervals. In the state where the N poles and the S poles provided at intervals of 10 DEG alternately face the arc element 3 only during the period of, the binary counter 92 is returned, and then the angle information signal TS is applied. The addition operation is performed only once, and then the operation that is returned again is repeated.

Thus, the binary state of the output (Q ₁₎ (Q ₂₎ of the counter 92 is a repetition of (00) (01), does not work, the output level of the AND gate 93 is "H".

On the other hand, in the vicinity of the reference position R, the magnetic poles are arranged as described previously at 5 ° intervals, and therefore, at time t = t ₁ , the level of the anti-first output signal V ₁ changes from "H" to "L". Then, four pulses are output as the angular information signal TS until it reaches the " H " level, and the binary counters (tu), (tv), (tw) and (tx) at each of the descending time points (tu) 92) are added one by one.

As a result, the outputs Q ₁ and Q ₂ together become "l" between the times tw and (tx), and the value of the reference position information signal RS becomes "l".

That is, when the level of the reference position information signal RS is the timing of the reference position R, it becomes "H".

According to the above-described configuration, in one magnet ring, as the form of the magnetic stimulus is studied, the measurement of the period of the angle information signal is performed in order to derive the angle information signal for each angle and the required reference position information signal. Therefore, even if the rotation speed of the magnet ring suddenly changes for some reason, the reference position information signal can be accurately and surely obtained, and a reliable rotation signal generator can be obtained at a low price.

Furthermore, in the above-described embodiment, a hole element is used as an element for detecting a change in the magnetic field occurring near the magnet ring 2, but other well-known magnetic detection elements can be used.

In the above-described embodiment, the normal, reverse phase output signals Sa and Sb from the hole element 3 are first input to the differential amplifier circuit 4 to obtain an amplified output signal So, and then the amplified output. Inverting amplifier 6 is configured to obtain different inverted amplifier output signal So at 180 ° phase with signal So, but amplifies normal, reversed phase output signals Sa and Sb separately, It goes without saying that the amplified signal may be configured to be input to the first and second non-intersections.

In addition, in the embodiment shown in FIG. 1, the circuit of the second non-intersection 7 can detect the second output signal V ₂ shown in FIG. 2 g in response to the normal output signal So. As the circuit configuration, the inversion amplifier circuit 6 may be removed.

According to the present invention, as described above, it is possible to generate the same number of pulses as the number of magnetic poles provided in the rotating body during one rotation of the rotating body, and the magnetic poles can exhibit the switching timing.

The timing indicated by this pulse can be obtained with high accuracy by timing the arrangement of magnetic poles provided in the rotating body accurately.

When the pulse density of the rotating signal may be the same as before, the area per one stimulus on the rotating body can be increased, and the level of detection signal can be increased by increasing the amount of magnetization, so that the noise margin for foreign noise is large. It helps to improve reliability.

In addition, when the detection signal level and the rotation pulse density may be the same as in the prior art, the size of the rotating body can be reduced, so that the size can be reduced.

Furthermore, it is possible to reliably derive the reference position information signal indicating the reference position without increasing the number of the rotating bodies, despite the variation in the rotational speed of the rotating body, and to achieve the high performance and excellent reliability of the rotating signal generator without increasing the cost. It can be realized.

Claims (1)

On the other hand, the magnetic poles (N pole) and the other poles (S poles) are alternately arranged at equal intervals, and when the rotor rotates with a fixed pole arrangement pattern with different pole placement patterns only at the required reference positions, A detection means for outputting a detection signal according to the change in response to a change in the magnetic field generated near the rotating body, and a level comparison path having hysteresis characteristics in the level comparison operation, the detection signal being equal to the first reference level. First means (7) for outputting a first output signal (V ₁ ) which becomes a predetermined level change state at all timings in which the state of the magnetic field is shifted under the influence of the N pole as described above under the influence of the N pole as described above. And a level comparator having hysteresis characteristics in the level comparison operation, and by comparing the first reference level with another second reference level and the detection signal, by stimulus arranged at narrow intervals. Saint-second means for outputting a second output signal (V ₂₎ which is at a constant level change condition in moving under the influence of the N poles foregoing timing under the influence of a magnetic bar S-pole state is above a non-magnetic field ( 5) first output means for outputting a first pulse signal indicating a timing of a constant level change state in response to the first and second output signals, and responsive to the first pulse signal and the second output signal V ₂ . And a second output signal means for outputting a second pulse signal indicative of the timing of the reference position required.