When its output potential is high, an automatic excitation of the desired phase of the winding occurs (first, for example). As a rule, the latter are mounted from widespread transistors, although relatively recently integrated circuits have been used for this purpose. The characteristics of this equipment involve the use of various types of control circuits. After that, it sends its signal to the inverter, which is responsible for the value of the current, which stepper motors use. The logic circuit is turned on during the reception of the signal, after which it immediately determines the phase needed for activation. The value of this rotation is expressed in degrees and is called pitch. We already mentioned that the rotor of the enginerotates a certain distance in response to each control pulse. For this purpose, three- and four-phase SMs were widely used. To better understand the device stepperengine and its principle of operation, you can consider the scheme of operation of the device under its control, which was used for making punch cards 20 years ago. To expand the scope of application of a stepper motor, it is required to find ways to reduce vibration. So, turning the rotor is enoughunstable, oscillatory, why the rotational speed and other characteristics of the movement in no case can not be as accurate as they are in DC motors with a feedback loop. It should be remembered that this scheme (without a feedback loop) is beneficial from an economic point of view, but it has a number of significant limitations. This principle of operation is used in schemes withopen connection. This avoids the need to use an expensive and complex feedback loop, and the motor protection becomes simpler (you only need to provide a quick de-energization). Such engines are often used in circuits where speed control is required. Most often this equipment is controlledspecial electronic circuit. Open-loop control systems (without feedback) It is worth remembering that the stepper motor, the principle of operation of which will be described below, is a synchronous device. Each movement ends with fixation in a strictly defined position. This is the name of the electromechanical deviceused to transmit the control signal to the mechanical movement of the rotor. The principle of operation and the device of this device are described in the article. In modern electrical engineering is usedmany of the most diverse devices, some of which are intended to automate technological operations.
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