First, the control accuracy is different
The step angle of the two-phase hybrid stepper motor is generally 1.8° and 0.9°, and the step angle of the five-phase hybrid stepper motor is generally 0.72° and 0.36°. There are also some high-performance stepper motors with smaller step angles after subdivision. The control accuracy of the communication servo motor is ensured by a rotary encoder at the rear end of the motor shaft.
Second, the low-frequency characteristics are different
The stepper motor is prone to low-frequency oscillation at low speed. The oscillation frequency is related to the load situation and the function of the driver, and it is generally considered that the oscillation frequency is half of the no-load take-off frequency of the motor. This low-frequency oscillation, which is determined by the operating principle of the stepper motor, is very unpleasant for the normal operation of the machine. When the stepper motor operates at low speed, damping skills should generally be used to overcome the low-frequency oscillation phenomenon, such as adding dampers to the motor, or subdividing skills on the driver.
The communication servo motor works very smoothly and does not oscillate even at low speeds. The communication servo system has a resonance suppression function, which can cover the lack of rigidity of the machine, and the frequency analysis function (FFT) inside the system can detect the resonance point of the machine, which is convenient for system adjustment.
Third, the moment frequency characteristics are different
The output torque of the stepper motor decreases with the increase of speed, and will drop sharply at higher speed, so its maximum operating speed is generally 300-600RPM. The communication servo motor is a constant torque output, that is, within its extra speed (generally 2000RPM or 3000RPM), it can output additional torque, and it is a constant power output above the additional speed.
Fourth, overload can be different
Stepper motors generally do not have overload capabilities. The communication servo motor has a strong overload ability, and its maximum torque is many times the extra torque, which can be used to overcome the moment of inertia of the inertial load at the moment of starting. Because the stepper motor does not have this overload ability, in order to overcome this inertial torque in the selection, it is often necessary to select a motor with a larger torque, and the machine does not need such a large torque during normal operation, which presents the phenomenon of torque waste.
Fifth, the operation function is different
The control of the stepper motor is open-loop control, the starting frequency is too high or the load is too large, it is easy to show the phenomenon of losing steps or stalling, and the speed is too high when aborting, and it is easy to show the phenomenon of overshoot. The communication servo drive system is closed-loop control, the driver can directly sample the response signal of the motor encoder, and the internal position ring and speed ring are formed, which generally does not show the phenomenon of step loss or overshoot of the stepper motor, and the control function is more reliable.
Sixth, the speed echo function is different
The stepper motor needs 200-400 milliseconds to speed up from stopping to working speed (generally hundreds of revolutions per minute). The acceleration function of the communication servo system is better, and it only takes a few milliseconds from stopping to its extra speed, which can be used in the operation occasions that require fast start and stop.
To sum up, the communication servo system is superior to the stepper motor in many functions. However, in some undemanding occasions, stepper motors are often used to perform motors. Therefore, in the design process of the control system, it is necessary to summarize and consider the control requirements, cost and other factors, and select the appropriate control motor.
|
More on that
|
Mitsubishi PLC hardware installation method
1. Use the special crimping pliers for network cable to crimp one end of the cable and the RJ45 crystal head; The other end is connected to the FX2N-485-BD communication template according to the method shown in Figure 1-Figure 3, and the two unused P5S terminals are not connected.
2. Open the panel cover on the left side of the PLC host, and put the FX2N-485-BD communication module ...
|
|
Mitsubishi Electric CNC numerical control system grounding specification
What is the effect of machine tool grounding?
1. Insist that the machine shell and the ground insist on the same voltage.
2. In the event of abnormal external voltage or leakage, the maintenance personnel and the machine tool will not be damaged electrically.
3. Avoid damage to CNC equipment caused by external voltages such as surges.
4. ...
|
|
Mitsubishi origin regression method
1. Data setting type
This method is to set the current bearing as the origin. Therefore, at this time, no matter which direction the servo motor stops at, only the data setting type origin return is required, and now this direction is the origin direction. So, the origin regression operation under this method, ...
|
|
Mitsubishi servo motor for precise positioning
The servo?mechanism is a process control system that enables the output of the direction, direction, and condition of the block to change at will according to the input overall goal (or given value).
How to finish the Mitsubishi servo motor ...
|
|
Mitsubishi PLC FX series position control unit
The FX-20GM is a 2-axis positioning machine that can be operated independently.
1. Pulse output unit
1. Point-controlled pulse output unit F2-30GM
2. Pulse output module FX-1PG (for FX2 and FX2C)
...
|
|
Mitsubishi inverter control method
There are several ways to classify Mitsubishi inverters:
According to the classification of the main circuit operation method, it can be divided into voltage-type inverter and current-type inverter; According to the classification of switching methods, it can be divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;
Depend on...
|
|
How to deal with Mitsubishi PLC failures
01. Base system problem
In Mitsubishi PLC, there are binary, octal, decimal, 10, 2-10 (BCD), etc., we need to master the conversion of 2-8 base.
2-8, remember the binary number from the back, divide every 3 into a group, and each group is converted into octal respectively, such as 1 ...
|
|
Mitsubishi inverter basic questions and answers
1. Question: What is the type of RS485 to RS232C converter used by Mitsubishi inverter for communication?
Solution: FA-T-RS40* Mitsubishi inverter is available.
2. Question: Mitsubishi inverter frequency external potentiometer is given, and the external potential recommended to be used ...
|
|
Mitsubishi PLC password protection settings
In GX Works3, there are three types of security settings: block password, security key, and file password. The block password is for the program to prevent others from reading and writing changes, only for the program; The file password is for the PLC to prevent others from reading and writing changes. Security keys are both capable of ...
|
|
Mitsubishi FX5U series PLC advantages
1. CPU function
As a MELSEC IO-F series PLC actuator, it is equipped with executable structured programs and multiple program actuators, and can be written to ST language and FB.
2. Built-in analog input and output (alarm output by the way)
Built-in 12-bit 2-channel analog input ...
|
|
Internal data structure of the Mitsubishi PLC FX series
A lot of data is used in the internal structure of the PLC and in the user's use program. These data have the following ways in terms of structure or number system.
(1) Decimal number
Decimal numbers are also known as word data in PLC. It is first and foremost ...
|
|
Mitsubishi servo system selection
Mitsubishi servo system mainly has MR-J4, MR-JE, MR-JE-AS and other series, MR-J2S, MR-J3, MR-ES has been discontinued, gradually withdrawn from the shopping mall, the first three are considered.
When selecting a Mitsubishi servo, the first thing is to choose the MR-J4 series or MR-JE series according to the application, and the driver uses the A-type ...
|
|
Mitsubishi touch screen GT10 series models and their features
GT1020 touch screen
● The palm is large, the wide screen displays, and the ultra-small size is 3.7 inches
●3-color LED backlight for added visibility
●High brightness liquid crystal, clear under light
● Resolution 160×64, standard memory 512K
●Inside ...
|
|
OC troubleshooting method reported during inverter operation
1. For the test of the power output capacity of the driving circuit, to detect the pulse terminal signal such as GU\EU, it is not possible to have voltage (or pulse waveform) alone, and the current output capacity should be detected, and then admit whether it is normal;
2. Admit the defects of the current transformer. My solution is to use the ...
|
|
Fault analysis of Mitsubishi inverter OC1 and OC3
Mitsubishi inverter OC (overcurrent problem) will be caused by the following reasons, taking A500 series inverter as an example:
1). Caused by improper parameter setting problems, such as time setting is too short.
2）. ...
|
|
The Mitsubishi PLC FX2N is connected to a computer through the group Taiwang
In the PLC control system, the content that needs to be displayed mainly includes timer value, counter value and data register value, and the data display method can be summarized into two fundamental types: one is based on the PLC data communication interface, such as RS-232, RS-485/422, and the display device also has such an interface.
|
|
Mitsubishi servo motor AL.50 alarm solution
During the operation of the Mitsubishi servo motor, it may be possible to display an AL.50 alarm under certain circumstances (such as after a period of continuous operation), what is going on? And how to solve it?
First of all, we need to know that the reason why the AL.50 alarm is presented is because the Mitsubishi servo ...
|
|
Mitsubishi PLC's six programming languages
(1) Ladder diagram
Programming language is traditionally called a ladder diagram. The ladder diagram follows the method of relay control circuit, and it can also be said that the ladder programming language is simplified from the symbol evolution on the basis of the logic control of relays and contactors commonly used in electrical control systems.
|
|
How to create a Mitsubishi CPU module project
Mitsubishi CPU module engineering creation method
Start engineering tools, create projects.
[Establishment process]
1. Select the CPU module to be used in the "Model" item. In the "Programming Language" project, select ...
|
|
The reason why the computer programming software and the Mitsubishi PLC cannot communicate
What is the reason why the programming software on the computer and the Mitsubishi PLC cannot communicate? How do I set the port of the communication line?
There are several reasons why communication may not be available:
1. It may be that the PLC is not energized;
2. Programming software to create ...
|
|
Contact
working hours
