JPS6277086A - Synchronous motor step out alarm device - Google Patents

Abstract

PURPOSE:To rapidly perform repairing work of a step out phenomenon by detecting a reciprocating vibration phenomenon generated due to the step out of a synchronous motor by an overload torque to generate an alarm externally. CONSTITUTION:A synchronous motor step out detector 8 inputs a feedback signal F(S) to detect an amplitude (frequency of step out state) due to the step out phenomenon of a synchronous motor DM to discriminate the continuing time, and when it is continued for the prescribed period, and it decides whether an alarm signal (step out alarm) is output or not. A step out warning circuit 9 operates with an alarm signal from the detector 8 to warn the step out phenomenon by an LED display.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a synchronous motor step-out alarm device having an alarm device that detects a step-out state of a synchronous motor and issues an alarm to the outside.

<Conventional technology> Hereinafter, the conventional technology will be explained based on the drawings.

FIG. 3 is a block diagram showing a control device using a synchronous motor.

In FIG. 3, the (9 difference signal τ(S) is the command signal j(
s) and a feedback signal F(s>
is subtracted by subtraction circuit 1 to obtain 1q. This (deviation signal τ(
S) is converted by the command signal generation circuit 2 into a command signal in which the rotational speed of the synchronous motor DM in one direction of rotation is determined. Since the synchronous motor DM rotates in synchronization with a sine wave (sin) and a cosine wave (COS), the command signal from the command signal generation circuit 2 is converted into a sine wave (sin) and a cosine wave (cosine wave) at the waveform generation circuit 'i83. COS). The respective waveform signals converted into a sine wave (s in) and a cosine wave (COS) are output to a power amplification circuit 4.5, where the power is amplified and the synchronous morph D
Rotate M. The rotation of this synchronous motor DM (for example, rotational movement as shown by arrow
transmitted to. The link mechanism 71 is attached to, for example, an angle 72a that determines the movement limit of its operation (for example, left and right movement as shown by arrow Y), and its position is adjusted back and forth (this adjustment is used to protect and control the link mechanism 71). A bolt 72b that can be attached (attached to improve the efficiency of the function of the target 7) and a nut 72c that fixes this bolt 72b.
When there is no input to the synchronous motor DM, the movement range is limited by the stopper 72 consisting of is returned to the neutral position. That is, the link mechanism 71 is connected to the spring 73.
a and 73b have a load torque that continues to push the synchronous motor DM to the neutral position.

<Problems to be solved by the invention> However, this conventional control device using a synchronous motor has the following problems:
There are problems described below.

In the control device using the synchronous motor shown in FIG. 3, normally the link mechanism 71 does not step out of synchronization because the synchronous motor DM rotates so that the link mechanism 71 only moves in front of the stop collar 72. For example, when the fixed position of the stopper is moved inward from the fixed position due to external vibrations such as hull vibrations, or due to accidental manipulation (in other words, the position where the movement range of the link mechanism is narrowed). The link mechanism 71, which is a diagram for explaining FIG. 3 in FIG. 4, hits the stopper 72 and shows a characteristic in which the load torque curve suddenly increases.
> is larger than the setting range of the stopper 72.

The synchronous motor DM has a characteristic Δ, and in section B, the rotation angle increases and the load torque increases at J3, but after passing A, the rotation angle does not increase and the load torque rapidly increases toward C.

On the other hand, at this point, the 11JI motor DM is out of synchronization, so that the generated torque suddenly becomes zero, causing a so-called step-out phenomenon, and the rotation angle returns from C to B. And again synchronous motor D
, M are synchronized, the rotation angle and load torque increase from B toward Δ, and when A<C), a step-out phenomenon occurs and the rotation angle and load torque drop again. This process (reciprocating phenomenon) is repeated unless the position of the stopper 72 is corrected.

However, in the past, the reciprocating vibration phenomenon caused by the out-of-step phenomenon of the synchronous motor DM was difficult to detect at the installation site. This caused breakdowns and malfunctions due to reduced mechanical life. Therefore, in order to prevent this step-out phenomenon, it is necessary to inspect the device at regular intervals, which is a burden on the operator and is a step backwards in terms of reliability.

The present invention has been made in view of the problems of the prior art, and is a synchronous motor step-out alarm device that detects the reciprocating vibration phenomenon that occurs when the synchronous motor steps out due to overload torque and issues an alarm to the outside. The purpose is to provide

Means for Solving the Problems> The synchronous motor step-out alarm device of the present invention, which aims to achieve the above-mentioned object, operates a synchronous motor based on a deviation signal between a command signal and an output feedback signal. , when there is no input to the synchronous motor, a link mechanism that operates in conjunction with the movement of the periodic motor is returned to the center position by a return mechanism to control the object to be suppressed, and inputs the feedback signal to control the synchronous motor. If the amplitude due to the step-out phenomenon continues for a certain period of time, the synchronous motor step-out detection circuit determines whether to output alarm 1 to the step-out alarm device.
The control alarm device is characterized in that it issues an alarm to the outside when the alarm signal is input.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings. In the following drawings, parts that overlap with those in FIG. 3 are given the same numbers, and explanations thereof will be omitted.

FIG. 1 is a block diagram of a synchronizer step-out warning device which is a specific embodiment of the present invention.

In Fig. 1, 8 inputs a feedback signal E(S>, detects the amplitude (frequency of the step-out state) due to the step-out phenomenon of the synchronous motor DM, determines its duration, and issues an alarm if it continues for a certain period of time. This is a synchronous motor step-out detection circuit that determines whether to output a signal (out-of-step alarm).

The feature of this synchronous motor step-out detection circuit 8 is that it reliably detects the rotational frequency of the synchronous motor DM when it is not out of step and the frequency that is returned and reciprocated by a spring load when it is out of step. It has a circuit configuration that allows for discrimination. A specific circuit for this purpose includes, for example, a comparison circuit with hysteresis 81, a selection circuit 82, and an out-of-step state continuation determination circuit 83. The individual circuit configurations are configured as follows, for example. Comparison circuit with hysteresis 8
1 is an inverting input terminal of the comparator Q, which cuts the direct current component of the feedback signal F(s) with a filter circuit consisting of a capacitor C+ and a resistor R7, in order to prevent a weak noise-like signal from being output from the comparator Q. On the other hand, the output via resistor R2 is fed back to the non-inverting input terminal of comparator Q+ and is grounded via resistor R3. The selection circuit 82 detects only signals within the time constant determined by the timer, so that the output of the comparison circuit 81 with hysteresis is detected by the timer T.
+ and NOT gate N, and their outputs are led to AND gate Δ1. The out-of-step state continuation determination circuit 83 determines whether the out-of-step state continues even if it is in the out-of-step state, and determines whether to output an alarm signal. On the other hand, the output of the timer T3 is turned off, and the output of the timer T3 is turned off, such as the AND gate A2, which is input through the flip-flop FI + timer T3°, and the AND gate A2, which is input through the not gate N2.
1, a set pulse generation circuit RP that outputs a reset signal that resets 1 (configured to output a reset pulse when the power is turned on), a flip-flop F2 that operates with the output of the AND gate A2, and a flip-flop F2. It consists of a capacitor C2r that outputs a reset signal for resetting, a reset switch SSM, and a reset pulse generation circuit RP2 consisting of a resistor R4.

Note that the reset pulse generating circuit RP2 has a reset signal at a high level, so that it always resets the flip-flop F2 when the power is turned on, and once the moon center state is reached, the flip-flop F2 is reset unless the reset switch S S + is pressed.
is not released. 9 operates with an alarm signal from the synchronous motor step-out detection circuit 8 to warn of a step-out phenomenon of the synchronous motor DM. In this embodiment, when an LED display is used, resistors R5 and R6 and a transistor Q2. This is a step-out alarm circuit consisting of a step-out alarm display circuit consisting of an LED and a step-out alarm display circuit.

Figure 2 is a time chart 1 showing the operation of the configuration shown in Figure 1.
− is. The operation will be explained below using FIG. 2.

In FIG. 2, Ll and L2 are comparison circuits 8 with hysteresis.
Resistor R3 connected to the non-inverting input terminal of comparator Q of No. 1
The hysteresis detection level is determined by the value of , and α is the feedback signal F in a noise-like weak signal state.
(s), β is the feedback signal F (s) consisting of the frequency fluctuation width when the synchronous motor DM is clearly out of step and in the state of reciprocating vibration phenomenon, and γ is the maximum when the synchronous motor DM is in a normal state. This is the feedback signal F(S) consisting of one frequency range in the operating state.

The circuit operation when the feedback Ia to F (s) of the command state β is input will be described.

At time t1, when the feedback No. 13 F (s) exceeds the hysteresis detection level Ll, the output of the comparator Q becomes high (hereinafter referred to as "1").

In response to this day signal, timer T+ with timer setting time Ta is turned on (H). At this time, the NOT gate N1 becomes low (hereinafter referred to as rLJ), and therefore the output of the AND gate A1 becomes L. When the feedback signal F's> exceeds the hysteresis detection level L2 at time t2,
The output of comparator Q+ is ! :Narinot gate N1 is H
becomes. At this time, since timer T1 remains on (1() operation), AND gate A+ becomes H and the timer setting time Tb
Then, the timer T2 is operated, and the timer T3 whose timer setting time is set to C, which operates to determine the duration of the prone state via the flip-flop [i, is operated. That is, the operation of the AND gate Δ1 detects only the output of the comparator Q1 within the operating time of the timer setting time Ta determined by the timer Tl in order to extract only the high frequency signal (β) of the IBM tone state. . Therefore timer T21
This occurs when flip flop 7'F+ and timer T are on. However, Δ2 to Antogame-1 is not gate N
Since 2 is L, it becomes 1-, and the continuation of the step-out state is determined. When the high frequency rll signal continues to be out of step for a certain period of time and at time t3, the timer setting time Tc of timer T3 has elapsed and the timer T3 is set up and turned off, in response to this signal, the output of the not gate N2 becomes l-. 1 and operates the reset pulse generating circuit RP+ to reset the flip-flop F1 with the reset signal. When the output of the NOT gate N2 becomes 1-(, the timer T2 is operating with a retrigger and continues to output ON, so the AND gate A2 changes from L to H, setting the flip-flop F2 to H. In other words, an alarm is generated. The signal is output to the leakage %i alarm circuit 9.The stepout alarm circuit 9 displays an ED in order to warn of the step-out phenomenon of the synchronous motor DM based on the alarm signal inputted through the above process.On the other hand, the flip-flop F
2 continues to issue an alarm signal as it is, so r11
When the m operation is completed, for example, when the rKC recognition operation of adjusting the stopper 72 to cancel the step-out phenomenon is completed, the reset switch SS+ is pressed to cancel the alarm signal.

Next, a case will be described in which a feedback signal F(s> of the normal state T is generated by the stopper adjusted in this manner).

When the feedback signal F (s) exceeds the hysteresis detection level L1 at time t4, the output of comparator 0 becomes 1.
-1, the timer T1 is on, the not gate N1 is low, and the AND gate A + is low. In this normal state 'γ, the frequency change is gradual, so at time t
Since the output of comparator Q1 remains H even if it is set up and turned off after the timer setting time d has elapsed in step 5,
Not Gate NI continues L. Therefore, AND gate A1 continues to be L. At time t6, the output of comparator Q1 becomes L.
When this occurs, the NOT gate N1 becomes H and this 1'' signal is guided to the AND gate Δ1, but since the output of the timer T1 has already been turned off in this poem, the AND gate A1 continues to be L. In other words, in the circuit of the present invention, the step-out 1 kF alarm circuit 9 does not operate in the normal state γ, and can reliably operate only in the step-out state.

<Other Examples> By the way, synchronous motor step-out detection circuit 8 and step-out alarm circuit 9
is not limited to that shown in FIG.
It is sufficient to have a circuit configuration that can reliably distinguish between abnormal high frequencies that are returned by a spring load and vibrate back and forth in an out-of-step state, and the out-of-step alarm circuit 9 can be easily configured by the operator. Something that can alert you to the occurrence of a step-out phenomenon, etc.
For example, % of Bukei A, etc.! Any circuit configuration that provides information may be used.

<Effects of the Invention> As described above in detail with reference to the embodiments, the synchronous motor out-of-step atilFiF alarm device of the present invention can perform step-out repair work by outputting out-of-step %1IiFi. As a result, it is possible to prevent the bearing life of the synchronous motor from decreasing and the mechanical life of the control shaft from decreasing, leading to improved reliability. In addition, the synchronous motor step-out detection circuit has a circuit configuration that can reliably distinguish between a state in which there is no step-out and a state in which the motor is out-of-step, which eliminates the issue of error alarms and improves reliability for workers. There are also psychological effects.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a synchronous motor alarm system according to a specific embodiment of the present invention, Fig. 2 is a time chart, and Fig. 3 is a block diagram showing a system using a synchronous motor. FIG. 4 is a diagram for explaining FIG. 3 of FIG. DIVI... same ++11 motor, 1... subtraction circuit,
2... Command 1Δ generation circuit, 3... Waveform generation circuit,
4, 5... Power amplifier circuit, C... Displacement detection circuit, 7
...Control pair, 8...Synchronized -9 step-out detection circuit, 9
...Out-of-step alarm circuit. 1-+

Claims (1)

[Claims] A synchronous motor that operates based on a deviation signal between a command signal and an output feedback signal, and a link mechanism that operates in conjunction with the movement of this synchronous motor when there is no input to the synchronous motor are returned to the central position by a return mechanism. In a control device using a synchronous motor having a controlled object consisting of a control object, the feedback signal is input to determine whether or not to output an alarm signal when the amplitude due to a step-out phenomenon of the synchronous motor continues for a certain period of time. A synchronous motor step-out alarm comprising: a synchronous motor step-out detection circuit; and a step-out alarm device that operates based on an alarm signal output from the synchronous motor step-out detection circuit to warn of a step-out phenomenon of the synchronous motor. Device.