CN103713154A - Method for judging motor rotating direction by using trigger and coder - Google Patents

Abstract

The invention relates to a method for judging the steering direction of a motor by using a trigger and an encoder, which is characterized in that the steps are as follows: the first step, the speed pulse encoder outputs a two-phase pulse signal according to the obtained motor rotation information, and the two-phase pulse signal Any phase pulse signal of any phase is connected to the input terminal of the flip-flop as an input signal, and the other phase pulse signal is connected to the clock terminal of the flip-flop as a clock control signal; the second step is to detect the output of the flip-flop by the microcontroller, When the motor turns, the clock control signal is reversed, and the output of the flip-flop changes from high level to low level, or from low level to high level. The invention uses the two-phase output of the encoder and the characteristics of the trigger to convert the steering information into a level signal and provide it to the microcontroller. It has the advantages of simple device, low cost, high accuracy, and real-time detection.

Description

A Method of Using Trigger and Encoder to Judge the Rotation of Motor

technical field

The invention relates to a method for judging the rotation direction of a motor according to a TTL logic level by using a trigger and a speed pulse encoder, and real-time detection of motor steering information can be realized by connecting the level signal to a microcontroller such as a single-chip microcomputer .

Background technique

With the development of computer and electronic technology, more and more embedded motor control systems are applied to production and life. The difference from traditional control systems is that this control system uses logic level signals to transmit information to achieve closed-loop feedback for automatic control. If the motor steering information is directly converted into a logic level signal by using the circuit, the microcontroller only needs to detect the voltage of the corresponding pin to obtain the current steering information of the motor in real time, which not only improves the efficiency of the system, but also improves the accuracy of detection , has a very good application prospect.

When judging the steering of the motor, a speed encoder is often used to convert the speed information of the motor into a pulse signal. For example, the E6A2 series encoder produced by Omron Corporation adopts an orthogonal two-phase pulse code output, and the two phases have a 90-degree phase difference. After testing, the low level of the pulse is less than 0.5V, and the high level can be between 5V-12V according to the voltage of the pull-up resistor connected. The phase stability between the two phases is relatively high, and the voltage is relatively stable.

The current method uses the collected two-phase pulse numbers to program the microcontroller to realize the judgment of the motor steering. This method increases the complexity of the system. Since the values of the two pulse count registers need to be read at regular intervals, Reduced operating efficiency of the microcontroller. In addition, the same number of pulses may be received within a certain period of time, so it is impossible to judge the direction of the motor, and the recognition success rate is not high.

Contents of the invention

The technical problem to be solved by the invention is to reduce the complexity of motor steering detection, and at the same time, improve the recognition success rate.

In order to achieve the above object, the technical solution of the present invention provides a method for using a trigger and an encoder to judge the steering of a motor, the steps of which are:

In the first step, the speed pulse encoder outputs two-phase pulse signals according to the obtained motor rotation information. Any one phase pulse signal of the two-phase pulse signals is connected to the input terminal of the trigger as an input signal, and the other phase pulse signal is connected to Input the clock terminal of the flip-flop as a clock control signal;

In the second step, the microcontroller detects the output of the flip-flop. When the motor turns, the clock control signal is reversed, and the output of the flip-flop changes from high level to low level, or from low level to high level.

Preferably, when the motor rotates in the forward direction, at the rising edge of the clock control signal, the input signal is at a high level, and the output of the flip-flop is at a high level; when the motor rotates in the reverse direction When rotating, the clock control signal is inverted, and when the clock control signal rises, the input signal is at low level, and the output of the flip-flop is at low level.

Preferably, the waiting time is set by the micro-controller, and within the waiting time, the micro-controller counts the number of received high levels and low levels to judge the turning direction of the motor, so as to prevent the turning of the motor during the turning process. Jitter phenomenon.

The invention uses the two-phase output of the encoder and the characteristics of the trigger to convert the steering information into a level signal and provide it to the microcontroller. It has the advantages of simple device, low cost, high accuracy, and real-time detection.

Description of drawings

Fig. 1 is a schematic diagram of input signals and clock control signals when the motor rotates forward in the embodiment;

Fig. 2 is a schematic diagram of input signals and clock control signals when the motor rotates in reverse in the embodiment.

Detailed ways

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

The invention provides a method for judging the steering of a motor by using a trigger and an encoder, the steps are:

In the first step, the speed pulse encoder outputs two-phase pulse signals according to the obtained motor rotation information. Any one phase pulse signal of the two-phase pulse signals is connected to the input terminal of the trigger as an input signal, and the other phase pulse signal is connected to Input the clock terminal of the flip-flop as a clock control signal;

The second step is to detect the output of the flip-flop by the microcontroller. When the motor turns, the clock control signal is reversed, and the output of the flip-flop changes from high level to low level, or from low level to high level. Those skilled in the art can set it according to the actual situation. For example, when the power level is high, the motor rotates forward, and when the power level is low, the motor rotates reversely; Rotation, what this embodiment adopts is the former, specifically as follows:

When the motor rotates in the forward direction, at the rising edge of the clock control signal, the input signal is at a high level, and the output of the flip-flop is at a high level, as shown in Figure 1. The voltmeter detects that the output terminal of the flip-flop is high level. When the motor rotates in the reverse direction, the clock control signal is reversed. When the clock control signal rises, the input signal is at low level, and the output of the flip-flop is at low level, as shown in Figure 2. The voltmeter detects that the output terminal of the flip-flop is low level.

In order to prevent the jitter phenomenon during the motor steering process, the waiting time can also be set by the microcontroller. During the waiting time, the microcontroller can count the number of high and low levels received to judge the steering of the motor. , for example, in this embodiment, during the waiting time, if the number of high levels received by the microcontroller is 2, and the number of low levels is 6, it can be determined that the motor is turning from forward to reverse Turn and vice versa.

Apply the steering control method of the present invention to a two-wheeled upright balance trolley. When the trolley is running, it is necessary to detect the rotation of the current wheels quickly and in real time to achieve closed-loop feedback of vehicle speed control. Use this method to detect the rotation direction of the wheels in real time to achieve A more stable upright effect.

Claims (3)

1. A method utilizing trigger and encoder to judge motor turning, is characterized in that, the steps are: In the first step, the speed pulse encoder outputs two-phase pulse signals according to the obtained motor rotation information. Any one phase pulse signal of the two-phase pulse signals is connected to the input terminal of the trigger as an input signal, and the other phase pulse signal is connected to Input the clock terminal of the flip-flop as a clock control signal; In the second step, the microcontroller detects the output of the flip-flop. When the motor turns, the clock control signal is reversed, and the output of the flip-flop changes from high level to low level, or from low level to high level. 2. A method for judging the turning direction of a motor using a trigger and an encoder as claimed in claim 1, wherein when the motor rotates in the forward direction, at the rising edge of the clock control signal, the input If the signal is at a high level, the output of the flip-flop is at a high level; when the motor rotates in reverse, the clock control signal is inverted, and at the rising edge of the clock control signal, the input signal is at low level, the output of the flip-flop is at low level. 3. a kind of method utilizing flip-flop and encoder to judge motor turning to as claimed in claim 1, is characterized in that, wait time is set by described micro-controller, in the wait time, is received by micro-controller statistics The number of high levels and low levels is used to judge the direction of rotation of the motor.

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