How to detect the pulse of the stepper motor, how to test the stepper motor

Controlled with PLC.

Stepper motor, with the pointer meter DC voltage level, if the pulse frequency is not high, you can see the swing of the pointer, if the frequency is high, there will be an approximate average voltage indication.

In addition, there is a stepper motor speed measurement method:

The stepper motor is the pulse signal.

Convert to angular or linear displacement. First, the overload is good. Its speed is not affected by the size of the load, unlike ordinary motors, when the load increases, the speed will decrease, and the stepper motor has strict requirements for speed and position when used.

Second, it is convenient to control. The stepper motor rotates in "step" units, and the digital characteristics are more obvious.

Third, the structure of the whole machine is simple. The traditional mechanical speed and position control structure is more complex and difficult to adjust, and the structure of the whole machine becomes simple and compact after using the stepper motor. The tachometer motor converts the speed into voltage and transmits it to the input as a feedback signal.

The speed motor is an auxiliary motor, which is an ordinary DC motor.

The tail end of the speed measurement motor is installed, and the voltage generated by the speed measurement motor is fed back to the DC power supply to achieve the purpose of controlling the speed of the DC motor.

If you just look at it, you can see it clearly by plugging it in an oscilloscope. If you want to use it, you need to use a sampling resistor and then use an optocoupler and then send it to a microcontroller (or computer).

Look at how big the step angle is, for example, the step angle is 200 pulses for one revolution.

A: Stepper motor.

The test is divided into physical and electrical performance tests.

Physical properties: first observe whether there is wear, bumps, cracks, etc., and rotate the motor shaft to see if there are stuck points. Use balancing.

Test the instrument to see if it meets its requirements, whether there is jitter, abnormal noise, etc.

Electrical performance test: The motor comprehensive test system is used to test the motor resistance, insulation, alternating resistance, turn-to-turn, reverse embedding, torque, speed, power and other parameters to see whether it meets its production specifications.

Stepper motor testing requires the use of some specialized testing tools, and here are some basic test steps:

1.First, the test tool needs to be connected to the controller of the stepper motor.

2.Make sure that the various interfaces of the stepper motor are connected correctly, such as the power interface, control signal interface, etc.

3.Open the test tool and set it up and calibrate it according to the tool's instructions.

4.Select the model and parameters of the stepper motor in the test tool and test it.

5.During the test, the motion state and speed of the stepper motor can be observed, and the test results can be recorded.

6.If the test result is abnormal, troubleshooting can be performed according to the diagnostic information provided by the test tool or the instruction manual of the stepper motor.

It should be noted that safety precautions need to be taken when testing stepper motors to avoid electric shocks and other accidents. At the same time, the instruction manual of the test tool and stepper motor should be carefully read before the test to ensure the accuracy and safety of the test.

About the good or bad test of stepper motor:

Generally, do not connect the drive first, manually rotate the motor shaft, and feel whether it rotates smoothly. Normally, if you manually turn the motor shaft and turn it around, the resistance should be the same.

Then connect to the drive test, the control signal is the common yang mode, pul + connected to the signal power supply, pul-

connected to the control signal. If it is a common cathode mode, the pul+ is connected to the control signal, and the pul- is connected to the signal ground. If the control signal input of the driver is 5V level by default, you can directly connect PUL+ to 5V power supply, PU-

The contact test is carried out continuously, which is equivalent to manually generating pulses;

As long as the wiring between the motor and the drive is correct, the motor will take a step when touching.

Automatic grinding and lifting, round-trip supporting leakage gravity sensing.

Stepper motors. The calculation method of the number of pulses, which is used to calculate the parameters of the stepper motor, the pulse equivalent, etc.

1。First of all, identify the lead screw. The lead screw of wire 5 is a distance of 5 between every two wires.

2。The stepper motor is 200 steps and the circle is 200 degrees.

3。Drive.

It is 8 subdivisions, that is, it is divided into 8 subdivisions.

4。So every step of the motor through the drive is a degree 8 = degree return line.

5。So 200 8 = 1600 steps per revolution.

6。Leads. The lead screw of 5 moves 5 mm per revolution, and each step moves 5 1600 = mm, which is the motor parameter. If the argument of Pb3 is, then the analogy.

7。Dividing the motor parameter by 1 is the pulse equivalent, e.g., 1, which is the number of steps required per millimeter step, i.e. the pulse equivalent.

The ball screw is driven by a stepper motor.

As an example, the relationship between pulse equivalence and step angle is briefly discussed.

First, let's assume the pitch.

h is 5 mm, the stepper motor is a two-phase motor for renting Sakura, and the stepping angle a is a degree.

When the motor is running in full steps, it receives 200 pulses (degrees = 360 degrees) and rotates.

Because the pitch h h is 5 mm, i.e. the linear displacement of the motor is 5 mm when the motor rotates in one revolution, so the pulse equivalent is 5 mm 200 pulses = mm pulses. The current positioning accuracy is mm. Assuming that the given positioning accuracy is mm (equivalent to the pulse equivalent of delta=), the step angle of the motor should be determined.

Summary. After the pulse signal of the stepper motor is completed, the method of taking the signal is to send the pulse as much as you want according to the instruction, but it is necessary to send it every scanning cycle. The control method is to detect the return signal, which is the number of feedback pulses of the servo motor.

If the setting is equal to the feedback back, the PLC will not send it. The PLC pulse command is based on the pulse width tuning to determine the time, the pulse itself has the time setting required to send, and it is right to send a pulse motor to turn a little, and the PLC can control how many pulses to send and how long it takes. You don't have to worry about that.

After the completion of the pulse signal of the stepper motor, the method of obtaining the signal is to send the pulse, which is to send as many as the instruction at one time, but it is necessary to send it every scanning cycle. The control method is to detect the return signal, which is the number of feedback pulses of the servo motor. If the setting is equal to the feedback back, the PLC will not send it.

The PLC pulse command is based on the pulse width tuning to determine the time, the pulse itself has the time setting required to be sent, the Ant Gear Bridge sends a pulse motor to turn a little right, and the PLC can control how many pulses to send for a long time. You don't have to worry about that.

The stepper motor is different from ordinary AC and DC motors, and must be used with a special stepper motor driver to be able to rotate. In the automated production process, we use the programmable control shed key artifact (Liangyou PLC) parameter requirements to send pulses to the stepper driver, the stepper motor driver drives the stepper motor to rotate according to the received signal, and the programmable controller (PLC) uses the encoder feedback signal synchronized with the stepper chain loss motor to compare with the internal value, and accurately controls the stepper motor running trajectory through a complete closed-loop control system.

We are glad to answer for you, when the pulse signal of the stepper motor is completed, you can judge the motion state of the motor by detecting the position signal output by the motor. Stepper motors typically have two position signal output modes: Hall element output and attendant encoder output.

1.Hall element output: Some stepper motors have a built-in Hall element that can output a position signal.

As the motor rotates, the Hall element senses a change in the rotor's poles and outputs a pulse signal. This type of signal is characterized by a relatively low frequency, generally no more than a few hundred hertz. 2.

Coder output: Some high-precision stepper motors are equipped with encoders that can output high-precision position signals. An encoder is a device that converts position information into a digital signal, and it can output the position of the motor corresponding to each pulse signal.

This kind of signal is characterized by high frequency and high accuracy, which can generally reach more than a few thousand hertz. In practical applications, it is common to use a controller such as a microcontroller or PLC to read the position signal of the stepper motor. Based on the received position signal, the controller will determine whether the motor has moved to the target position and whether the motor movement needs to be further adjusted.

The sound and erection time of the pulse stepper motor refers to the time difference between the time when the stepper motor receives the pulse signal and the actual movement starts. This time difference is mainly determined by factors such as the response time of the stepper motor controller and the mechanical inertia of the stepper motor. In general, the response time of pulsed stepper motors is slower than that of DC motors.

On the circuit side, the response time of a stepper motor controller depends on parameters such as the design of the controller and the speed of the components used. Generally speaking, a good controller has a shorter response time and is able to respond to control signals and turn the stepper motor faster. In addition, the response time of the stepper motor is also related to its characteristic parameters, such as moment of inertia, load inertia, motor output power, etc., which affect the acceleration and inertia of the stepper motor, and thus affect the response time.

Overall, the response time of a pulsed stepper motor is influenced by a combination of factors. In order to ensure the fast, accurate and stable movement of the motor, it is necessary to select the appropriate stepper controller and stepper motor according to the actual application situation, and at the same time reasonably design the circuit and system parameters, and constantly optimize the control party to keep an eye on the case, so as to improve the response speed and performance of the motor.