Selection and testing of the microelectric motor. Drawing, description

MODELING
Free library / Directory / Modeling

Selection and testing of the microelectric motor. Tips for a modeler

Modeling

Commercially available micromotors, although they differ in appearance and operating parameters, have basically the same design principle. These are two-pole DC electrical machines with excitation from an external magnet (magnets). The three-prong laminated drum-type anchor is assembled from electrical steel plates. The winding of copper insulated wire is connected in a "triangle" or "star" pattern. Power supply - from a brush assembly mounted in the engine cover, and a three-lamella cylindrical collector pressed onto the armature shaft.

Modifications of individual components and parts of microelectric motors are quite diverse. In particular, a distinctive feature of MDP and DP motors is the use of magnets in the form of rectangular bars made of cobalt-based alloys with magnetic cores cast into a plastic case and a polystyrene cover glued to the case. Characteristic representatives of motors in a metal case are motors of the DI1 series, they use segmented barium ferrite magnets. The polystyrene covers are secured to the body of these motors with crimping tabs. Such engines can be easily disassembled and assembled without violating the integrity of the cover or housing.

Do you know in advance which engine is suitable for your model? If the loads are small, motors of the DP brand are suitable, if medium (0,4 -0,5 W) - MDP1 or DI1-2, with a power of more than 0,6 W - motors of the brand DI1-3.

Take a 4,5-volt coin cell battery with you when you go to the store. It is convenient in that it is easy to connect any microelectric motor to its terminals.

Ask the seller for permission to select the engine to your liking, but do not rush to connect the battery. First, inspect the engine externally, first of all, paying attention to the fixation of the cover. Is it firmly fixed, are there any distortions. Then check the condition of the contact clips by moving them with your fingers. If they are poorly fixed, play, put this engine aside - during operation, it may lose contact in the brush-collector assembly.

Then inspect the working part (neck) of the shaft. Whether there are bends, surface defects, rust, burrs. This is necessary to ensure reliable fastening of the toothed tube, pulley or other structural elements on the shaft.

Place your fingers around the shaft and slide it slightly axially from one end position to the other. Axial play should be within 0,5 - 1 mm. Less play will cause friction losses between the end surfaces of the armature and the bearing flanges, especially if the grease thickens; and a larger one will lead to a displacement of the anchor package relative to the active zone of the engine magnetic field. In addition, a large shaft play can cause a break in the connection between the tube and the gear of the first stage of the model or toy gearbox.

Rotate the shaft in both directions. If it scrolls with effort or does not rotate by inertia, put this motor aside - it is also faulty.

And now let's consider this option - a preliminary check did not find any defects: the cover sits firmly in place, the brackets and contacts are fixed rigidly, the axial play of the shaft is normal, its ends are in order, and it rotates by hand freely in both directions without jamming. This is where it's time to connect the battery to it. The engine must run vigorously from it. Reverse the polarity and listen to the operation of the motor. If the tone of the sound during reverse (changing the direction of rotation) is easily audible, you should not purchase such an engine - it is assembled in violation of the so-called geometric central and will not be able to develop the required power under load.

Press your finger on the side surface of the shaft of a running engine. Such side loads must not stop the rotation of the shaft. Reverse polarity and repeat procedure. If the shaft speed drops sharply with a slight pressure, then the engine is faulty, its power and efficiency are below normal.

But since the engine has withstood these tests, listen to its work carefully again. The sound should be smooth, not rattling. Fingers covering his body should not feel sharp vibrations. And the outlines of the shaft should be clear, not blurry. Otherwise, put the motor aside - it can fail you due to armature eccentricity and shaft runout.

So, all the excitement behind - you picked up the engine. But do not rush to install it on the model. Stand it upright, apply one or two drops of liquid oil to the base of the shaft and spin it. Do the same with the other end of the shaft.

We recommend interesting articles Section Modeling:

▪ Rubber model paddle steamer

▪ solar engine

▪ Flying saucers

See other articles Section Modeling.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Primium Seneca keyboard 05.05.2024

Keyboards are an integral part of our daily computer work. However, one of the main problems that users face is noise, especially in the case of premium models. But with the new Seneca keyboard from Norbauer & Co, that may change. Seneca is not just a keyboard, it is the result of five years of development work to create the ideal device. Every aspect of this keyboard, from acoustic properties to mechanical characteristics, has been carefully considered and balanced. One of the key features of Seneca is its silent stabilizers, which solve the noise problem common to many keyboards. In addition, the keyboard supports various key widths, making it convenient for any user. Although Seneca is not yet available for purchase, it is scheduled for release in late summer. Norbauer & Co's Seneca represents new standards in keyboard design. Her ... >>

The world's tallest astronomical observatory opened 04.05.2024

Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>

Random news from the Archive

Smartphones Poco X5 Pro 08.02.2023

The Poco brand, owned by the Chinese company Xiaomi, introduced the Poco X5 and Poco X5 Pro smartphones. New items belong to the middle price category, featuring an attractive performance-to-price ratio for many users.

The Poco X5 Pro is the successor to the Poco X4 Pro 5G smartphone introduced just over a year ago. The main upgrade from its predecessor is the use of a 6nm Snapdragon 778G processor with Adreno 642L graphics, which is significantly faster than the Snapdragon 695 chip found in the X4 Pro. The amount of RAM of the new LPDDR4X smartphone is 6 or 8 GB, the capacity of the UFS 2.2 flash drive is 128 or 256 GB. The device runs Android 12 with MIUI 14 for Poco.

Also, the smartphone received an improved display. Its main parameters are the same as the Poco X4 Pro model: it is a 6,67-inch AMOLED panel with a resolution of 2400 x 1080 pixels (FHD +) and a refresh rate of 120 Hz. However, unlike its predecessor, the new product provides 10-bit color depth with 100 percent coverage of the DCI-P3 color space. The maximum brightness of the display is 900 cd / m2, while using a PWM mechanism with a frequency of 1920 Hz. Gorilla Glass 5 protects the display from scratches.

The main camera module is equipped with a 108MP 1/1,52-inch sensor, which is complemented by an 8MP ultra wide-angle module with a 120° field of view and a 2MP macro sensor. The resolution of the front camera is 16 megapixels.

The specifications of the Poco X5 Pro also include Wi-Fi 6 and Bluetooth 5.2 wireless adapters, an IR module, an NFC chip, a USB-C port, and a 3,5mm audio jack. The 5000mAh battery supports 67W charging.

In turn, the Poco X5 smartphone is built on a Snapdragon 695 chip along with 6 or 8 GB of RAM and a flash drive with a capacity of 128 or 256 GB. Memory can be expanded with a card slot up to 1TB.

The Poco X5's 6,67-inch display has FHD+ resolution and a 120Hz refresh rate. The display has a maximum brightness of 1200 cd/m2 and also provides 8-bit color representation. Gorilla Glass 3 is used to protect the screen from scratches.

The rear camera of the smartphone includes a main 48-megapixel sensor, an 8-megapixel sensor with ultra-wide-angle optics (118 °) and a 2-megapixel sensor for macro photography. On the front is a 13MP selfie camera. The battery of the device has the same capacity as the Poco X5 Pro, but the charging power is 33W. However, with a 33W charger, it only takes 0 minutes to charge the battery from 100 to 68%.

The Poco X5 specs also include Wi-Fi 5 adapters, Bluetooth 5.1, a 3,5mm headphone audio jack, an IR transceiver, and an NFC chip.

Poco X5 6/128 GB is $250, Poco X5 8/256 GB is $300. The Poco X5 Pro starts at $300 for the base 6/128GB model, while the Poco X5 Pro 8/256GB costs $350.

Other interesting news:

▪ Triple premiere of Lenovo

▪ 16-Gbps Resistive RRAM Chip

▪ Plasma accelerator for plants

▪ Improved efficiency of flexible CIGS solar cell

▪ Charging gadgets with vibration from walking

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Electrician's tool. Article selection

▪ article Vacuum cleaner. History of invention and production

▪ article How did the mountains appear? Detailed answer

▪ article Bear's ear. Legends, cultivation, methods of application

▪ article VGA tester. Encyclopedia of radio electronics and electrical engineering

▪ article Microcontrollers of popular families. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews