JPH0672762B2 - Rotation signal generator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation signal generator, and more particularly to a binary signal or a continuous rotation operation selectively associated with intermittent rotation operation. The present invention relates to a device that can obtain a binary signal.

(Prior Art) Conventionally used rotation signal generators output a signal related to smooth continuous rotation like a rotary encoder, and output a signal related to intermittent rotation operation like a rotary switch. There is something to do.

For example, in the recorder, when designating the pen position and setting the arbitrary value, one that outputs a signal related to smooth continuous rotation like the former rotary encoder is used,
For the switching of the input range and the chart speed, the latter rotary switch that outputs a signal related to the intermittent rotation operation is used.

(Problems to be Solved by the Invention) However, according to the conventional configuration as described above, in order to obtain the signal related to the continuous rotation operation and the signal related to the intermittent rotation operation, respective mechanical parts are used. The number of parts must be increased, and the configuration becomes complicated.

The present invention focuses on these points, and an object thereof is to use a common mechanical component and to electrically control a signal or intermittent rotation related to continuous rotation operation without changing the mechanical configuration. It is an object of the present invention to provide a rotation signal generator capable of selectively obtaining a signal related to an operation.

(Means for Solving the Problems) A rotation signal generator according to the present invention includes a rotor made of a permanent magnet, which rotates according to a force applied from the outside, and a main coil and an auxiliary coil, respectively. A rotation signal generating mechanism having two exciting coil groups arranged to be orthogonal to each other, and an induced voltage output from one exciting coil of each exciting coil group in accordance with the rotation of the rotor of the rotating signal generating mechanism. A waveform shaping section for binarizing each and a magnetizing means for selectively exciting the other magnetizing coil of the magnetizing coil set to generate a holding torque with respect to the rotation of the rotor are provided. Depending on the presence or absence, a binary signal related to intermittent rotation operation or 2 related to continuous rotation operation
It is characterized in that the binarized signal is selectively output.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram of a permanent magnet rotation type rotation signal generation mechanism used in the present invention, (A) shows an electrically equivalent model of a permanent magnet rotation type stepping motor, and (B) is a permanent magnet rotation type stepping motor. The actual structural model of a motor is shown, (C) shows the connection relation of the DC power supply in (B), (D) shows the generation state of the magnetic field when driven by the connection relation of (C), (E) Shows a vector diagram of the holding torque generated by the excitation of each coil. In FIG. 1, reference numeral 1 denotes a rotor made of a permanent magnet, which is rotated clockwise (CW) or counterclockwise (CC) according to a force applied from the outside.
W) rotate. Reference numerals 2 and 3 denote exciting coils composed of main coils 2a and 3a and auxiliary coils 2b and 3b, respectively.
Are arranged so as to be electrically orthogonal to each other with respect to the rotation center. In FIG. 1, the excitation coils 2 and 3 having a midpoint COM are used, the midpoint COM and the coils at one end A and B are the main coils 2a and 3a, and the midpoint COM and the other end are coils. Are auxiliary coils 2b and 3b. The rotation signal generating mechanism having such a structure has the same structure as a known permanent magnet rotation type stepping motor.

Generally, the mechanical step angle θ _MS of a permanent magnet rotary type stepping motor is expressed by θ _MS = 360 / {Zr · (p / 2)} (degrees). Here, Zr is the number of poles of the rotor 1, and p is the number of poles of the stator. In the case of the model (B), since Zr = 2 and p = 4, θ _MS = 90 degrees.

By the way, the DC power source in the case of the model of (B) is connected as shown in (C), for example, and a positive voltage is applied to the terminal, and a negative voltage is applied to the terminal COM, and a DC current is applied to the terminal,
Flows from the terminal to the terminal COM. As a result, a magnetic field is generated in the direction shown in (D) and hits the rotor 1.

As a result, as shown in (E), by exciting the coils 2b and 3b, A holding torque is generated as a synthetic force of. The magnitude of the holding torque F is determined by the shapes of the teeth of the rotor 1 and the stator. At this time, the rotor 1 is (D)
Stand still. This holding torque gives a feeling of a click operation during intermittent rotation.

FIG. 2 is a rotor 1 in the rotation signal generating mechanism of FIG.
Is a waveform diagram of the induced voltage of the main coils 2a, 3a and the auxiliary coils 2b, 3b of each exciting coil 2, 3 when is rotated to CW or CCW, the solid line shows the induced voltage of CW, and the broken line shows the induction of CCW. It shows the voltage.

As is clear from FIG. 2, the phases of the induced voltages of the main coil 2a and the auxiliary coil 2b of the exciting coil 2 and the main coil 3a and the auxiliary coil 3b of the exciting coil 3 are 180 electrical degrees, respectively.
.Degree., The phases of the induced voltages of the main coil 2a of the exciting coil 2, the main coil 3a of the exciting coil 3, the auxiliary coil 2b of the exciting coil 2 and the auxiliary coil 3b of the exciting coil 3 differ by 90.degree. In electrical angle. Then, the lead and lag of the phase are inverted according to the rotation direction of the rotor 1.

Therefore, each induced voltage of the main coils 2a and 3a or the auxiliary coil 2
By rotating the waveforms of the induced voltages b and 3b, binarizing them, and counting, the rotation angle and the rotation direction can be obtained. That is, if the step angle, which is the rotation angle by one pulse applied in the case of a stepping motor, is θ °, the number of binarized pulses after waveform shaping is
It becomes 360 / (4θ) per rotation.

FIG. 3 is a circuit diagram showing an embodiment of the present invention. Third
In the figure, reference numeral 4 denotes an exciting circuit for exciting the auxiliary coils 2b and 3b, which is composed of a DC power source E, a diode D, a transistor Q, resistors R1 and R2, and a switch SW. The DC power source E is connected to the emitter of the transistor Q, the anode of the diode D is connected to the collector of the transistor Q,
The cathode is connected to the emitter of the transistor Q. The collector of the transistor Q is the auxiliary coil 2
It is connected to the common potential point via b and 3b, and the emitter is a resistor.
It is connected to a common potential point via the series circuit of R1 and the switch SW, and the base is connected to the connection point of the resistor R1 and the switch SW via the resistor R2. Reference numeral 5 is a waveform shaping unit that binarizes the induced voltage output from the main coil 2a, and 6 is a waveform shaping unit that binarizes the induced voltage output from the main coil 3a.
Each of these waveform shaping sections 5 and 6 is composed of a series circuit of an integrator IT and a comparator CP.

The operation of the apparatus thus configured will be described.

The amplitudes of the induced voltages in the main coils 2a and 3a of the excitation coils 2 and 3 change depending on the rotation speed, and decrease as the rotation speed decreases. That is, when the rotor 1 is rotated, the magnetic flux interlinking with the main coils 2a and 3a of the exciting coils 2 and 3 is changed, and electromotive force based on the principle of electromagnetic induction is generated.

When the magnetic flux is Φ and the time is t, the electromotive force generated in the closed coil is proportional to (dΦ / dt), and its amplitude is proportional to the rotation speed. On the other hand, since the amount of magnetic flux interlinking with the coil is constant regardless of the rotation speed, the integrated value of electromotive force is constant. Therefore, in the present invention, the voltage induced in the coil is integrated by the integrator IT to obtain an alternating voltage whose amplitude is almost constant regardless of the rotation speed.

Thereby, at the same time, the effect of reducing the distortion of the waveform and suppressing the high frequency noise can be obtained. The comparator CP receives the output voltage of the integrator IT, binarizes it, and outputs pulse signals φA and φB according to the rotation direction as shown in FIG. 4, respectively.

In order to obtain the binarized signal related to the intermittent rotation operation, the switch SW is turned on to excite the auxiliary coils 2b and 3b of the exciting coils 2 and 3 with direct current. In this way auxiliary coil 2b,
By exciting 3b, a torque for holding the position of the rotor 1 is generated. When a rotational force is externally applied to the rotor 1 in this state, the rotor 1 rotates intermittently with a step angle of 4θ. Also in this case, induced voltages having different phases of 90 ° are generated in the main coils 2a and 3a of the exciting coils 2 and 3 depending on the angular velocity. Therefore, based on these induced voltages, the rotation speed and the rotation direction can be detected as described above. The value of the exciting current may be adjusted so that the optimum intermittent torque can be obtained.

In order to obtain the binarized signal related to the continuous rotation operation, the switch SW is turned off and the auxiliary coils 2b and 3b of the exciting coils 2 and 3 are de-excited. In this case, only the detent torque acts on the rotor 1. This detent torque is sufficiently small in a small permanent magnet type rotation signal generating mechanism, and almost smooth rotation operation can be obtained.

These outputs will be described in detail with reference to the waveform chart of FIG. The rotation direction in the case of FIG. 5 is CW.

In FIG. 5, (a) shows the output of the main coil 2a in the intermittent rotation operation, (b) shows the output of the main coil 3a, and (c) binarizes the output of the main coil 2a at zero level. 2D shows a signal obtained by binarizing the output of the main coil 3a at zero level. As described above, a large static torque is generated by exciting the auxiliary coils 2b and 3b with direct current, the rotor 1 cannot rotate at a constant angular velocity, and the angular velocity is repeatedly decreased and accelerated. Because of this, the main coil
As shown in (a) and (b), the amplitudes of the output signals of 2a and 3a are large in the high speed part and small in the low speed part, but the phase relationship between the two output signals is (c) and (d). ).

On the other hand, (e) shows the main coil 2a in continuous rotation operation.
(F) shows the output of the main coil 3a, (g) shows a signal obtained by binarizing the output of the main coil 2a at zero level, and (h) shows the output of the main coil 3a. 2 at the level
It shows a signal that has been digitized. The static torque due to the permanent magnets of the rotor 1 when the auxiliary coils 2b and 3b are de-excited is sufficiently smaller than the external force, so the angular velocity becomes almost constant, and the output signal waveforms (e) of the main coils 2a and 3a ，
As shown in (f), it becomes substantially sinusoidal. Then, the phase relationship between these two output signals is preserved as shown in (g) and (h).

FIG. 6 is a configuration explanatory view showing a specific example of the rotation signal generating mechanism driving mechanism. In FIG. 6, 7 is a rotation signal generating mechanism as shown in FIG. 1, 8 is a rotary knob for giving a rotational force to the rotation signal generating mechanism 7, and these rotation signal generating mechanism 7 and the rotary knob 8 are gears 9,10. Are connected via. With this configuration, the angular resolution can be arbitrarily set according to the gear ratio. Further, by making the rotary knob 8 movable in the axial direction and turning on / off the switch SW of FIG. 3, it is possible to switch between the intermittent rotation operation output signal mode and the continuous rotation operation output signal mode. it can.

FIG. 7 is a circuit diagram showing a specific example of the operation sound generating circuit in the intermittent rotation operation output signal mode, and FIG. 8 is a waveform diagram of each part in FIG. In FIG. 7, 11 is a binarized signal φA, φ
A rotation detection pulse generation circuit that outputs a rotation detection pulse S based on B, a damping vibration generator 12 that outputs a damping vibration signal es similar to the click sound of a mechanical changeover switch according to the rotation detection pulse S, and 13 is a damping The piezoelectric speaker is driven by the vibration signal es. With this configuration, the piezoelectric speaker 13 is driven by the damping vibration signal es during the intermittent operation, and a good operation feeling can be obtained.

FIG. 9 is a structural explanatory view showing a specific example of a recorder using the rotation signal generating device according to the present invention shown in FIG. In FIG. 9, 14 is an input terminal for an analog input signal, which is connected to the input terminal of the voltage dividing circuit 15 corresponding to the measurement range. Reference numeral 16 is a changeover switch for changing over the voltage division ratio of the voltage dividing circuit 15, and the changeover is controlled by the range setting signal SR applied from the arithmetic control section 19. The analog input signal divided by the voltage dividing circuit 15 is converted into an A / D converter via an amplifier 17, converted into a digital signal, and then added to a calculation control unit (CPU) 19. Reference numeral 20 is an encoder configured as shown in FIG. 6, and is connected to the arithmetic and control unit 19 via an encoder interface 21. 22 is a display unit, which is used to set the input range, chart speed, and encoder 20.
The operation mode and so on are displayed according to the display control signal SD added from the arithmetic and control unit 19. Reference numeral 23 denotes a paper feed rotation signal generation mechanism drive circuit, which drives and controls the paper feed rotation signal generation mechanism 24 according to the paper feed control signal SPR supplied from the arithmetic control unit 19 to cause the chart 25 to run. Reference numeral 26 denotes a servo control circuit, which rotationally drives the servo motor 27 in accordance with the pen position setting signal SPE added from the arithmetic control unit 19,
Analog recording is performed on the chart 25 by moving the recording pen 28 to a position corresponding to the value of the analog input signal. A drive signal DV is applied from the servo control circuit 26 to the servo motor 27, and the servo motor 27 outputs the drive signal DV.
A feedback signal FB corresponding to the position of the recording pen 28 is added to 26.

In such a configuration, by setting the operation mode of the encoder 20 to the intermittent rotation mode, it is possible to perform the selection changeover setting such as the input range and the chart speed with the operation feeling similar to that of the conventional changeover switch, and set the continuous rotation mode. The pen movement setting to a desired position can be performed by.

That is, according to the configuration of FIG. 9, one encoder 20
Can set and adjust various parameters of the recorder.

Although FIG. 9 shows an example applied to a recorder, it is also effective as an adjustment setting mechanism in various devices.

(Effects of the Invention) As described above, according to the present invention, there is provided a rotation signal generator capable of selectively obtaining a signal related to continuous rotation operation or a signal related to intermittent rotation operation by electrical control. It can be realized and has a great practical effect.

[Brief description of drawings]

FIG. 1 is an explanatory view of a permanent magnet type rotation signal generating mechanism used in the present invention, FIG. 2 is a waveform diagram of induced voltage of the exciting coil of FIG. 1, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. 4, FIG. 4 is an explanatory diagram of a binarized signal in FIG. 3, FIG. 5 is an example waveform diagram in each operation mode of FIG. 3, and FIG. 6 is an explanatory diagram showing a concrete example of a rotation signal generating mechanism. FIG. 7 is a circuit diagram showing a specific example of the operation sound generating circuit in the intermittent rotation operation output signal mode, FIG. 8 is a waveform diagram of each part of FIG. 7, and FIG. 9 is a specific example of the recorder using the present invention. It is a structure explanatory view. 1 ... Rotor, 2,3 ... Excitation coil, 4 ... Excitation circuit,
5,6 ...... Waveform shaping section, 7 ...... Rotation signal generation mechanism, 8 ......
Rotation knob, 9,10 ... Gear, 11 ... Rotation detection pulse generation circuit, 12 ... Attenuation signal generator, 13 ... Piezo speaker.

Claims (1)

[Claims] 1. A rotor composed of a permanent magnet and rotating according to a force applied from the outside, and two exciting coils each composed of a main coil and an auxiliary coil and arranged so as to be electrically orthogonal to each other with respect to the center of rotation of the rotor. A rotation signal generating mechanism having a pair, a waveform shaping section that binarizes an induced voltage output from one exciting coil of each exciting coil group in accordance with the rotation of the rotor of the rotating signal generating mechanism, and the exciting coil group. The other excitation coil is selectively excited to generate a holding torque with respect to the rotation of the rotor, and the binarization related to the intermittent rotation operation is performed according to the presence or absence of the excitation by the excitation means. 2 related to signal or continuous rotation motion
A rotation signal generator characterized by selectively outputting a binarized signal.