JPS6181184A - Rotation direction control device for rotating body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotational direction control device that realizes stable rotational performance by switching a rotational direction command based on the rotational speed of a motor.

Structure of a conventional example and its problems FIG. 1 shows a conventional rotational direction control device. S-Vrl
Set the rotation direction of the motor with SW2, and set ○N/○FF of the motor with SW2. A first rotational direction command signal 1 (T1) and a second rotational direction command signal 2 (T2) IrlSTOP, CCW output from this device.

A voltage level as shown in Table 1 is output for each CW setting.

Table 1 However, in conventional rotation direction control devices, the rotation direction command signal is constant regardless of the motor rotation speed, so for example, when switching the rotation speed setting from high to low speed, the motor drive current is set to zero. The motor continues to rotate due to inertia,
There is a problem in that it takes time to reach the low reference speed and it is difficult to obtain stable rotation.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and aims to realize stable rotation of a motor.

Structure of the Invention The present invention includes a rotation command circuit that outputs a motor rotation direction setting signal and a rotation stop signal, a rotation direction detection circuit that detects the rotation direction of the motor and outputs a rotation direction detection signal corresponding to the rotation direction. It has a control circuit that detects whether the rotational speed of the motor is below a reference speed or above a reference speed and outputs a control signal, and based on the rotational direction setting signal, rotational stop signal, rotational direction detection signal, and control signal, the motor If the rotational speed of the motor is less than or equal to the reference speed, a rotational direction command signal is output so that the motor rotates in the direction specified by the rotational direction setting signal, and if the rotational speed of the motor is greater than or equal to the reference speed, the rotational direction is The rotation direction command signal is configured to output the rotation direction command signal so that the motor rotates in a direction opposite to the rotation direction of the motor detected by the direction detection signal, and the rotation direction of the motor is determined by the rotation direction command signal. .

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a circuit diagram of an embodiment of the present invention. The rotation command circuit 3 outputs a rotation stop signal 4 and a rotation direction setting signal 5. As an example of the rotation command circuit 3, the circuit TE and 5TOP-C, which are composed of swl and SW'2 shown in FIG.
CW-CWcr) in each mode.

The voltage levels of the rotation stop signal 4 and the rotation direction setting signal 6 are as shown in Table 2.

Table 2 The control circuit 6 includes a rotation speed detection signal 7 (hereinafter referred to as FrequencyGe) for detecting the rotation speed of the motor.
nerator (abbreviated as FG) is input, and the FG signal signal 7 layer is at High level, and the rotational speed of the motor is less than or equal to the reference speed, that is, the frequency f of FGG No. 7 is the reference frequency f. . If it is below, the control signal 8 becomes Low level. Reference frequency f. is set slightly higher than the FG signal frequency f, which is the target speed of the motor.

Two rotation detection signals R1 and R2 having a phase difference of 900 are inputted to the rotation direction detection circuit 9, and the rotation direction of the motor is detected based on the advance or lag of the phase shift of these two rotation detection signals R1 and R2, and the rotation direction is detected. Rotation direction detection signal 1 with a voltage level corresponding to the direction.

Output.

An embodiment of the rotational direction detection circuit 9 is shown in FIG.

The rotation detection signals R1 and R2 are respectively input to the D and C terminals of the D-7 lip-flop (hereinafter abbreviated as D-F and F). D-F. F. 5 shows the timing of the rotation detection signals R1, R2 and the rotation direction detection signal 1Q when the signal input to the D terminal is rotating in the CCW direction at the rising edge of the signal input to the C terminal. motor is C
The timings of the rotation detection signals R1 and R2 and the rotation direction detection signal 1o when rotating in the W force direction are shown.

Based on the rotation direction setting signal 5, the control signal 8, and the rotation direction detection signal 10 explained above, if the rotation speed of the motor is less than the reference speed, the motor moves in the direction specified by the rotation direction setting signal 5. The voltage levels of the first rotational direction command signal 11 and the second rotational direction command signal 12 are set so that the motor rotates, and when the rotational speed of the motor is equal to or higher than the reference speed, it is detected by the rotational direction detection signal 10. An embodiment of a circuit for setting the voltage levels of the first rotational direction command signal 11 and the second rotational direction command signal 12 so that the motor rotates in the opposite direction to the rotational direction of the motor is shown in FIG. It is a communication. The first rotation direction command signal 11 and the second rotation direction command signal 12 for the combination of the rotation stop signal 4, the rotation direction setting signal 6, the control signal 8, and the rotation direction detection signal 10 are as shown in Table 2. .

Using the present invention to control the rotational speed of the motor (vl)
〉v2) Fig. 6 shows the temporal change in the rotational speed when switching to 〉v2). In this case, at T1, a rotation direction command opposite to that before T1 is output to the motor, the rotation speed of the motor decreases rapidly, and at the time TO, the rotation speed is set again in the rotation command circuit 3 when it reaches the reference rotation speed vO. A rotation direction command is output, and T
At point 2, the rotational speed stabilizes at the target rotational speed v2. However, in the conventional method, the rotation speed gradually decreases from T1 due to windage damage, etc., and T3
At the point in time, the target rotational speed becomes stable at ■2. That is, by using the present invention, the rotational speed can be changed instantly and stable rotational performance can be obtained.

In the rotational direction detection circuit explained in FIG. 6, D-F,
The rotation detection signal R2 input to the C terminal of F often has chattering at the rising edge and falling edge of the pulse, and as shown in FIG.・If the rotational direction detection signal 1Q has all the signals, the rotational direction detection signal 1Q becomes an erroneous signal, and when the motor rotational speed is switched from high speed v1 to low speed, the rotational direction command described in the first embodiment is Since the rotation speed changes from high speed rotation to low speed rotation while repeating CCW and CW, the rotation of the motor becomes unstable. Also, rotation direction detection signal 1Q
Therefore, there is a serious problem that the correct rotation direction cannot be detected.

The circuit shown in FIG. 8 is a rotational direction detection circuit that solves the above-mentioned problem, and inputs the FG multiplied signal R2 to a sequential circuit composed of DF, F, 13 and DF, F, 14. As a result, the rotation detection signal R with chattering-like noise
2, a noise-free rotation detection signal R2' can be obtained.

A signal obtained by dividing the FG times signal by H is applied to the C1 terminal of D-F, F, 13 and the C2 terminal of D-F, F, 14, and the rotation detection signal R2 is applied to the NOR gate N through the inverter N1.
Applied to 0R1 and N0R2. AND gate AND1
Ql and C2 are input to , and the 8-power signal of AND gate AND1 is input to NOROR gate N0R. AND
Qt and C2 are input to AND2, and the output signal of AND gate AND2 is input to NOR gate N0R2. 01 and C2 are input to 11JOR gate NOR3, and the output signal of NOR3 is D-F, F.
, 1s is applied to the C terminal.

The operation of the circuit shown in FIG. 8 will be explained using the timing charts shown in FIGS. 9a and 9b.

In Fig. 9a, F obtained by dividing the FG times the signal by a
G/2 signal rise T1. T2. T3. D-F at T4,
F.

The voltage level applied to the D1 terminal of No. 13 is output from Ql, and the voltage level applied to the D2 terminal of D-F, F, and No. 14 is output from C2. Yo'''c'r1 is D1
=I, , D2=H, Ql =L, C2=H.

At T2, D1=H, D2=L and Q1=H, Q2
=L. At T3 and T4, D1=H, D2=H, and Q1=02=H. Therefore, R2' changes from L to H at T3.

Also, in Figure 9, at T1, D1=L, D2=H
Therefore, 01=L and C2=H. At T2, 100i becomes H, so D1=D2=L, and 01=02=L. Then T3jT4. T5 is ' in Figure 9a, respectively.
l'1. T2. corresponds to T3, so at T6 R2' is L
Changes from to H.

As explained above, the circuit shown in FIG. 8 applies the rotation detection signal number' from which noise has been removed to the C terminals of D-F, F, and 1s for rotation direction detection, so that the correct rotation direction detection signal 16 is applied. is obtained.

Effects of the Invention When the rotational speed of the motor is switched from high speed to low speed, the rotational speed is immediately shifted to a predetermined rotational speed, and stable rotational performance can be obtained.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing a conventional rotation direction command circuit, Fig. 2 is a circuit diagram of a rotation direction control device according to an embodiment of the present invention, and Fig. 3 is a circuit diagram showing a conventional rotation direction command circuit.
The figure is an auxiliary diagram for explaining the operation of the control circuit in Figure 2, Figure 4 is a circuit diagram showing an example of the rotation direction detection circuit in Figure 2, and Figure 5 is a diagram showing the operation of the rotation direction detection circuit. 6 is an auxiliary diagram for explaining the present invention in detail; FIG. 7 is an auxiliary diagram for explaining other embodiments of the present invention; and FIG. 8 is an auxiliary diagram for explaining other embodiments of the present invention. FIG. 9 is an auxiliary diagram for explaining the entire operation of the rotation direction detection circuit shown in FIG. 8. 1゜11...First rotation direction command signal, 2,1
2...Second rotation direction command signal, 3...
・Rotation command circuit, 6...Control circuit, 9
...Rotation direction detection circuit, 13, 14, 15...
...D-F, F,. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 6 Figure 1゜Figure 7 Figure 8 Figure 9

Claims (2)

[Claims] (1) A rotation command circuit that outputs a motor rotation direction setting signal and a rotation stop signal, a rotation direction detection circuit that detects the rotation direction of the motor and outputs a rotation direction detection signal corresponding to this rotation direction, and a rotation direction detection circuit that outputs a rotation direction setting signal and a rotation stop signal. It has a control circuit that detects whether the speed is below a reference speed or above a reference speed and outputs a control signal, and based on the rotation direction setting signal, rotation stop signal, rotation direction detection signal and control signal,
When the rotational speed of the motor is below the reference, a rotational direction command signal is output so that the motor rotates in the direction specified by the rotational direction setting signal, and when the rotational speed of the motor is above the reference, the rotational direction is set. A rotating body characterized in that the rotation direction command signal is outputted so that the motor rotates in a direction opposite to the rotation direction of the motor detected by the detection signal, and the rotation direction of the motor is determined by the rotation direction command signal. Rotation direction control device. (2) The rotation direction detection circuit is composed of a D flip-flop, and the D and C terminals of this D flip-flop receive a first rotation detection signal and a second rotation detection signal, which have phases different by 90°, respectively.
The second rotation detection signal is input to the second rotation detection signal, and the rotation direction detection circuit has a chattering prevention circuit to eliminate chattering of the second rotation detection signal input to the C terminal of the D flip-flop. A rotational direction control device for a rotating body according to claim 1.