I disassembled a servo motor, servo motor driver and inverter to study on my own.

xy598646744

I disassembled a servo motor, servo motor driver and inverter to study on my own. [Copy link]

 

For more information, see the second post.

xy598646744

I recently disassembled a servo motor and servo motor driver. There is also a frequency converter, mainly to understand the difference between them. Recently, industrial intelligent manufacturing is so popular, I also made up for it by myself to understand the difference between the most used servo motors and drivers and the general ones. Due to my limited level, you can just watch it for entertainment. I have some questions below. In fact, it is a complete set of MR-J4-A, a 400w servo amplifier (driver) I won’t say much, here’s the picture first. This is what it looks like after disassembling the shell, remember the specific IC model. The main board is like this. Mitsubishi seems to have made its own main control IC. The input and output control has USB and parallel interfaces. The red one is the battery. Without the battery, it will not know the rotation coordinates (angles) when the power is off. I don't understand the others very well, so I dare not say anything. This is the power board below. The IPM is driven under the board, and the white wire is the brake resistor. On the back of the board, you can see the 4 screws for installing the IPM. There are not many components on the back. That’s it for the 3000+ driver. It mainly consists of two boards. One is the control board and the other is the driver board. Because it uses an IPM module (with various voltage and current measurements inside the module), there are not many external components. Well, I won’t say more. I’ll get to the servo motor (400W servo) that comes with this set later. The motor is divided into three parts, 1 motor, 2 brake, 3 motor encoder. The first two parts are not much different from most motors, so they are not shown in the picture. Let's get straight to the point, the photoelectric encoder (I disassembled it with the mentality of directly scrapping it, and I have to clean it up for 3000+). The encoder is at the end of the motor, and its external interface is connected by a flat cable. This is what it looks like after taking the back cover of the motor. There are a bunch of QR code labels on it, and I tore them off for easy viewing. This is mainly the receiving and processing unit of the photoelectric encoder. I took a picture of the inside, and the photoelectric receiving IC is a bit like the IC of a camera. Or according to my inference, its principle is a camera or photoelectric mouse. Looking at the second picture, you can see that it also has something similar to a lens. I wonder if the domestic photoelectric encoder is also like this. But the photoelectric encoder's encoder disk has one receiving line for each ring. Take another photo from a different angle. Finally, the photoelectric encoder disk. I accidentally touched it with my hand, but don't think it's broken. It still works fine (even with my fingerprints). It's not as fragile as I thought. I could see the scale on it, but my photography skills are limited and I didn't take a clear picture. Sorry. I also removed the drive of an inverter at the back, model: Siemens MM420. This is what it looks like after removing the outer shell. In the middle is the heat sink of the IPM. It doesn't look like there are many circuits, but it also has a small circuit board (click on the picture later), which is directly stuck on top of this. Connected through pin headers. This picture may be more detailed. Please forgive me if it is not clear. The white wire connector is connected to the cooling fan. I didn't see the square capacitors above, but there was space for them. I wondered: maybe they were not soldered to save costs. .. The heat sink is a bit blocked, and the main IC can be seen. This one with the most pins may be the frequency conversion control IC part of the inverter, or it may be the driver IC. I won't go into details (it is marked with Siemens LOGO). Another small circuit board of the inverter is directly installed on the large board in front. The main function is actually setting functions, and there are also communication and display (the BOP operation board needs to be purchased separately, which can be stuck on it). In order to make it easier to see the IC, I put some glue. The inverter's external control and communication lines are all here. The socket on the right, I don't know what the socket similar to the pin header that connects it to the bottom plate is called? The pin header on the bottom plate goes directly through it, but I haven't found anyone who has it. If anyone knows the name, please tell me. Finally, I found that I couldn't see the design difference between the inverter and the servo drive. Personally, I think: the inverter may be mainly designed to be compatible with asynchronous motors, and the servo drive is designed specifically for servo drives, but their basic principles and methods of controlling their operation and speed regulation should be similar; I am not very skilled, so there may be mistakes. This content was originally created by xy598646744, a netizen on the EEWORLD forum. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

qwqwqw2088

I didn't see the picture mentioned in the post

qwqwqw2088

Frequency converters are mainly used for speed regulation, such as the electrically controlled turning system. Three-phase AC is most commonly used for speed regulation through frequency conversion. Servo is more commonly used in position control. The servo system in industrial robots is widely used, with high precision, good stability and fast speed.

xy598646744

qwqwqw2088 posted on 2018-8-29 22:17 I didn't see the picture mentioned in the post

There are pictures on the second floor, the content is the same, I posted a post, but there are no pictures, and then posted it again and there are pictures. I guess it was merged by the administrator.