* What are the poles of an electric motor?

 The poles of an electric motor are nothing more than the positive pole or the negative pole of the magnet (similar to that of a magnet). The minimum number of poles of an electric motor is two, one negative and the other positive. The winding and construction of an electric motor with 2, 4, or 6 poles is carried out to vary the speed of the motor. The frequency of the alternating current at 50 Hertz defines a change of direction of 50 cycles or times per second. Each cycle or change of frequency creates two magnetic fields for each pole. Transforming into a mathematical formula, we will have: 2 (magnetic field) x 50 (frequency) x 60 (transformation of frequency from seconds to minutes) Since the frequency varies depending on the various nations or countries, simplifying the mathematical formula, we will have: 120 x Hz The calculation of the motor speed depends on the rotation speed of the magnetic field and the frequency of the current, which is usually 50Hz in Europe, related to the number of poles that will result.

In conclusion, we can say that the more poles we have, the lower the number of revolutions will be. For example, a two-pole motor in Europe will have the following number of revolutions:

Number of revolutions = (120x50) = 6,000/2 = 3,000 revolutions/min

The article discusses drilling machines mounted on columns, which can be either round or square, equipped with a manual speed change system. Here is a detailed description of the key points:

1. Types of Columns: These machines can be mounted on round or square columns. The choice of column shape depends on the specific processing and stability requirements.

2. Manual Speed Change: The drilling machines are equipped with a manual speed change system. This allows the operator to adjust the working speed according to the material type and the required precision, providing greater control and flexibility during operation.

3. Robust and Accurate Construction: The machines are designed and built with a focus on robustness and accuracy. This structural robustness allows for heavy-duty operations without compromising the precision of the final result. The solid construction is essential for maintaining the stability and reliability of the machine over time, even under high operational stress.

4. Testing According to ISO 2773 Standards: The machines are tested according to ISO 2773 standards. This international standard ensures that the machines meet specific quality and precision requirements. Testing according to these standards ensures that each tapping machine delivers optimal performance and adheres to globally recognized safety and reliability standards.

In summary, the described machines are versatile and precise tools, suitable for a variety of applications thanks to their robust construction and manual speed change system, tested according to rigorous standards to ensure high performance and durability.