Advantages and disadvantages of various methods of controlling asynchronous motors. Conclusions from practical experience.

Currently, squirrel-cage induction motors are widely used. This is because such machines do not have a brush assembly, their rotor is made of aluminum and technologically very simple, which means that the design itself is very reliable. Consider several ways to control a single-phase asynchronous motor.

The most common type of asynchronous single-phase electric motor is a motor with two stator windings. The first and second windings are identical in the number of turns, but in series with one of the windings include a capacitor ...

For the correct choice of wire cross-section, it is necessary to take into account the value of the maximum current consumed by the load. The current value is easy to determine, knowing the nameplate power of consumers according to the formula I= P / 220 (for example, for an electric heater with a power of 2000 W, the current will be 9 A, for a 60 W light bulb - 0.3 A).

Knowing the total current of all consumers and taking into account the ratio of the allowable current load for the wire of the open load on the wire cross section (for copper wire 10 A per 1 mm, for aluminum wire 8 A per 1 mm), you can choose a wire.

When performing hidden wiring (in a tube or in a wall), the values ​​given must be multiplied by a correction factor of 0.8. It should be noted that open wiring is usually performed with a wire of at least 4 mm cross section² based on sufficient mechanical strength ...

The article explains how to remake a conventional computer power supply for a voltage of 24 volts.

In some cases, there is a need for powerful power supplies for various equipment, designed for a voltage of 24 volts.

In this article I will tell you how you can remake a conventional computer power supply both ATX and AT for a voltage of 24 V. Also, from several such blocks, you can compose any voltage to power all kinds of devices.

Alteration is the addition of two power diodes, an inductor and a capacitor ...

Protective grounding, purpose and principle of action.

Currently, there are several different power supply systems for consumers with voltages up to 1000 V, however, in Russia, the main one in this case is a system with a grounded neutral. It is this system that is used in every home.

With the apparent complexity of the name, everything is extremely simple. In such a system, the neutral point of the transformer at the substation is directly connected to the ground. The main measure of protection against accidental undervoltage in this case is protective grounding, that is, a special connection of any metal part of the household appliance with the neutral of the transformer ...

The article will be interesting to people who decided to independently change the wiring in the apartment, house.

If you believe the statistics, the average homeowner (sorry for the officialdom) makes cosmetic repairs every 3-5 years, major repairs - once every 8-12 years. What is a facelift? This is a replacement for wallpaper, painting the ceiling, walls, windows, batteries ... That is, repair without significant investments.

Overhaul implies something more that requires significant financial costs. With major repairs, many change plumbing, heating appliances, tiles in bathrooms and in the kitchen. Someone is changing the flooring.Instead of old linoleum, they lay a laminate. There are many options. Everyone makes repairs based on their financial capabilities.

During the repair process, do not forget about the wiring ...

RCD - residual current device. Many probably heard, but someone probably knows what this device is, what it is for and how it works. Without really going into the jungle of physics, we will briefly try to understand the device, the principles of operation of this RCD itself in a simple human language.

So, as the name implies, this device is designed to protect against electric shock. The principle of operation of the device is based on a comparison of currents along the conductors at the input and output of the device. The currents must be equal. If there is a slight difference, the device “sees” it and immediately disconnects the load from the network. Response time, by standards, should be no more than 15-25 ms.

Now, in fact, we begin to review the reasons due to which, in practice, the operation of RCDs takes place ...

The article gives recommendations on the choice of spotlights. What you should pay attention to when buying fixtures.

Almost every one of us knows what point, recessed lamps are ... They appeared on our market relatively recently, 15-17 years ago, and immediately gained popularity. The popularity of this type of luminaire is determined by many factors: it is ease of installation, a variety of forms, aesthetics and practicality.

These lamps have been used almost everywhere where light is required. Recessed spotlights can be used as the main light, and additional, decorative. Many designers are using these fixtures in their design projects. With the help of spotlights, you can easily emphasize a particular interior detail ...

A story about what a safety transformer is, why it is needed and how it can be manufactured independently.

Many electrical, and more often electronic designs have transformerless power supplies. The power of such power supplies is usually small, but quite sufficient for powering devices such as thyristor power controllers, twilight switches, devices for slowing down incandescent lamps, timers, and many others.

Once assembled, such devices are placed in an insulating plastic case, which excludes human contact with live parts.

An isolation transformer, or as it is sometimes called a safety transformer, will be invaluable in setting up such devices. Such a transformer will not be out of place during the repair of such industrial manufacturing schemes ...