How does PLC drive stepper motor, electrical PLC automation, how many control methods are there for

A programmable controller (PLC) controls the number and frequency of pulses and the power sequence of each phase winding of the motor, and controls the rotation of the stepper motor.

Usually the rotor of an electric motor is a permanent magnet. When an electric current flows through the stator windings, the stator windings produce a vector magnetic field. The magnetic field will drive the rotor to rotate by an angle so that the direction of one pair of magnetic fields of the rotor coincides with the direction of the stator.

When the vector magnetic field of the stator rotates by one angle. The rotor also rotates at an angle with the magnetic field.

Each time an electrical pulse is inputted, the motor rotates at an angle to take a step forward. Its output angular displacement is proportional to the number of input pulses, and the rotational speed is proportional to the pulse frequency. Change the order in which the windings are energized and the motor is reversed.

Therefore, the rotation of the stepper motor can be controlled by controlling the number of pulses, the frequency, and the power sequence of the windings of each phase of the motor.

A programmable logic controller (PLC) controls the number of pulses, the frequency, and the energizing sequence of each phase winding of the motor to control the rotation of the stepper motor.

Usually the rotor of a motor is a permanent magnet, and when an electric current flows through the stator windings, the stator windings generate a vector magnetic field. This magnetic field causes the rotor to rotate by an angle so that the direction of the pair of magnetic fields of the rotor coincides with the direction of the magnetic field of the stator. When the vector magnetic field of the stator rotates by an angle.

The rotor also rotates at an angle with this magnetic field.

With each input electrical impulse, the motor rotates an angle to take a step forward. The angular displacement of its output is proportional to the number of pulses input, and the rotational speed is proportional to the pulse frequency. Change the order in which the windings are energized, and the motor will be reversed.

Therefore, the rotation of the stepper motor can be controlled by controlling the number of pulses, the frequency and the energizing sequence of each phase winding of the motor.

PLC can not directly drive the stepper motor, need to pass the corresponding driver to achieve the stepper motor control, for the pulse control type driver such as NDM552, need to send the control pulse and direction signal to the driver, for the speed control type driver such as NDC552, only need to give the start-stop and direction signal to realize the control of the motor. The wiring diagram can refer to the following figure:

The stepper motor is to receive the pulse signal given by the stepper driver, such as the two-phase stepper, the AB phase takes turns to output the positive and negative pulses (in a certain order), and the stepper motor can run, which is equivalent to a certain pulse stepper motor corresponding to a certain rotation angle. The PLC can also send out pulses, but the pulse voltage is not enough, so the pulse output of the PLC needs to be amplified to the stepper driver to drive the stepper driver, which is equivalent to the pulse of the PLC is the command pulse. Generally, there are two signals when PLC drives stepping, one is the angle pulse, and the other is the direction pulse, and the PLC is generally equipped with the so-called displacement command, which sends a trapezoidal pulse to the stepper driver, so as to buffer the force impact brought by starting.

The PLC needs to realize the control of the stepper motor through the stepper driver: 1. If the PLC controls the stepper motor through the control pulse, it needs to select the pulse-controlled stepper driver, and the user controls the speed of the stepper motor through the pulse frequency, the number of pulses controls the running distance of the stepper, and the direction signal controls the direction of the stepper motor; 2. If the PLC controls the stepper motor through the IO signal, it is necessary to select the speed-regulating stepper driver, the user can realize the speed control of the stepper motor through the DIP switch or potentiometer, and the direction signal controls the direction of the stepper motor; 3. If the PLC controls the stepper motor through the bus, it is necessary to select the bus-type stepper driver, and the user can control the position, speed, direction, acceleration and deceleration of the motor by modifying the corresponding control register.

The most important thing to control how much the stepper motor rotates is that you have to calculate how many pulses the motor needs to rotate once through the stepper motor step angle, for example, the step angle is 360 pulses for the stepper motor driver to rotate once, and 200 pulses for half a revolution. You should first understand the information of stepper motor driver!

The speed of the stepper motor is controlled by changing the pulse frequency, and it is more convenient to control it with the PWM output of PLC, the speed does not affect the stroke of the stepper motor, and the amount of stroke depends on the number of pulses.

Note that the faster the speed of the stepper motor, the smaller the torque, please adjust the speed according to your application to prevent misstepping, resulting in inaccurate positioning.

PLC control.

There are several ways to choose a stepper motor according to actual needs:

1. By controlling the pulse, you only need to choose the pulse control stepper driver, most of the stepper drivers are pulse control, considering the control signal level of the PLC.

It is 24V, and you can choose a driver that can directly receive 24V signals, so that there is no need to connect additional current limiting resistors;

2. Through the IO control mode, you need to choose the stepper driver with built-in pulse generator, and the user can use the DIP code or potentiometer.

Speed control, motor operation can be controlled by several IO switching signals;

3. Through the bus control mode, you can choose a stepper driver with RS-485 interface, CAN interface, EtherCAT interface, etc., and the motor can be controlled through communication instructions.

There are three main control methods of PLC control stepper motor, the first is single pulse control, that is, pulse + direction. This is also the most commonly used method, and it is the control method that stepper drivers have.

The second is double pulse control, that is, forward pulse + reverse pulse. This is not a control method that all stepper drivers have.

The third is communication control, which is generally serial RS232 or RS485. There are fewer stepper drivers with this feature.

Hope...

There are two kinds of PLC control stepper motors: one is the pulse port of the PLC itself, and the other is the positioning module. It mainly depends on the number of shafts and functions of the stepper motor.

The method and detailed operation steps of the stepper driver and PLC wiring are as follows:

1. First of all, hold the power supply for the 24V power supply: brown positive, blue negative, and yellow-green grounding, as shown in the figure below.

2. Secondly, connect the two wires of the motor to the "a+a-", b+b-" of the driver, as shown in the figure below.

3. Next, connect the 24V power supply "-V" to the "GND" of the drive, see the figure below.

4. Then, at this point, connect the 24V power supply "+V" to the "VDC" of the drive, as shown in the figure below.

5. Subsequently, connect the red and green front wires of the four-wire encoder to the "pul-" and "dir-" of the driver, as shown in the figure below.

6. Next, connect the Zheng Pisheng black wire of the four-wire encoder to "GND", as shown in the figure below.

7. Then, short the pul+ and dir+, and connect the white wire of the encoder to "dir+", see the figure below.

8. Subsequently, short "pul+" and "VDC", as shown in the figure below.

9. At this time, the two sets of wires of the motor have been connected, and the wiring work has been completed, as shown in the figure below.

It is possible not to use a PLC, but to use a stepper driver.

The stepper driver panel operation has the function of controlling the pulse output of the stepper motor, and there are many functions, using 10gm or 20gm as the positioning module.

The definition of a stepper motor is an open-loop control element stepper motor device that converts an electrical pulse signal into angular or linear displacement.

Therefore, there must be an electrical pulse signal to make the stepper motor rotate, and the controller and PLC give this electrical pulse signal to make the motor rotate.

The driver is a must, because it is a current amplifier, the PLC can be used, the pulse can also be sent with the step controller, it can also be programmed, and there are input and output points.

PLC can not directly drive the stepper motor, need to pass the corresponding driver to achieve the stepper motor control, for the pulse control type driver such as EZM552, need to send the control pulse and direction signal to the driver, for the speed control type driver such as EZD552, only need to give the start-stop and direction signal to realize the control of the motor. The wiring diagram can refer to the following figure:

The drive mode of the stepper motor: you directly connect the power supply DC5V (24V), and then send out the pulse through the PLC.

1: You first connect the stepper driver with the stepper motor.

2: Connect the power supply to the stepper driver, its power supply is generally DC24V DC5V3: connect the pulse receiver of the stepper driver to the Y0 Y1 of the PLC.

4: It's OK to send a pulse with the program.

1. First of all, the first step is to power the 24V power supply: brown positive blue negative yellow and green wire.

2. Then it is necessary to connect the two sets of lines of the motor to the driver A+ A-, B+ B-.

3. Then connect the 24V power supply-V to the GND of the driver, as shown in the figure below.

4. Then connect the 24V power +V to the VDC of the drive.

5. Then it is necessary to connect the red and green wires of the four-wire encoder to the driver pul- and dir-.

6. Then it means that the black wire of the four-wire encoder can be connected to the GND and the negative electrode.

7. Then it is to short connect pul+ and dir+, and connect the white wire of the encoder to dir+, as shown in the figure below.

8. The next step is to short circuit PUL+ and VDC.

9. Finally, at this time, the two sets of motor wires are connected, and the steering will change, as shown in the figure below.

Summary. Hello, the speed of the motor, the position of the stop only depends on the frequency of the pulse signal and the number of pulses, and is not affected by the change of load, when the stepper driver receives a pulse signal, it will drive the stepper motor to rotate a fixed angle in the set direction. The angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation.

PLC is how to control the operation of the stepper motor.

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Hello, the speed of the motor, the position of the stop only depends on the frequency of the pulse signal and the number of pulses, and is not affected by the change of load, when the stepper driver receives a pulse signal, it will drive the stepper motor to rotate a fixed angle in the set direction. The angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation.