By Bertille Solange. Motor. Publised at Monday, January 01st 2018, 05:05:03 AM. There is a special consideration if the power supply will be at or near the maximum voltage rating of the drive. If the motor will be rapidly decelerating a large inertial load from a high speed, care has to be taken to absorb the returned energy. The energy stored in the momentum of the load must be removed during deceleration and be safely dissipated. Because of its efficiency, the drive has no means of dissipating this energy so it returns it to the power supply. In effect, instead of drawing current from the power supply, the drive becomes a source of current itself. This current may charge the power supply capacitor to destructive voltage levels.
By Alix Loane. Motor. Publised at Friday, December 29th 2017, 20:40:03 PM. An ideal step motor would have zero mechanical friction, its torque would be proportional to ampere-turns and its only electrical characteristic would be inductance. Ampere-turns simply mean that torque is proportional to the number of turns of wire in the motor’s stator multiplied by the current passing through those turns of wire.
By Sasha Sara. Circuit. Published at Monday, November 06th 2017, 21:16:16 PM. Impedance is one of the most important concepts in electronic circuits. The purpose of impedance is to generalize the idea of resistance to create a component. To capture the behavior of resistors, capacitors, and inductors, for steadystate sinusoidal signals. This generalization is motivated by the fact that as long as the circuit is linear, its behavior can be analyzed using KVL and KCL.
By Lydie Honorine. Diagram. Published at Sunday, November 05th 2017, 20:23:44 PM. An electronic circuit is a circular path of conductors by which electric current can flow. A closed circuit is like a circle because it starts and ends at the same point forming a complete loop. Furthermore, a closed circuit allows electricity to flow from the (+) power to the (-) ground uninterrupted.
By Sasha Sara. Diagram. Published at Saturday, November 04th 2017, 20:03:26 PM. A wiring diagram is sometimes helpful to illustrate how a schematic can be realized in a prototype or production environment. A proper wiring diagram will be labeled and show connections in a way that prevents confusion about how connections are made. Typically they are designed for end-users or installers. They focus on connections rather than components
By Lydie Honorine. Circuit. Published at Thursday, November 02nd 2017, 19:35:35 PM. Electric circuits use electric power to perform some function, like energize a heating or lighting element, turn a motor, or create an electromagnetic filed. Electronic circuits differ from electric circuits in that they use devices that can themselves be controlled by other electric signals. Restated, electronic circuits are built from devices that use electricity to control electricity. Most electronic circuits use signals that are within 5 to 10 volts of ground; most circuits built within the past several years use signals that are within 3 to 5 volts from ground. Some electronic circuits represent information encoded as continuous voltage levels that can wander between the high and low voltage supply rails – these are called analog circuits. As an example, a sound pressure level transducer (i.e. a microphone) might drive a signal between 0V and 3.3V in direct proportion to the detected sound pressure level. In this case, the voltage signal output from the microphone is said to be an analog ifthe sound pressure wave itself. Other circuits use only two distinct voltage levels to represent information. Most often, these two voltage levels use the same voltages supplied by the power rails. In these circuits, called digital circuits, all information must be represented as binary numbers, with a signal at 0V (or ground) representing one kind of information, and a signal at 3.3V (or whatever the upper voltage supply rail provides) representing the other kind of information. In this series of modules, we will confine our discussions to digital circuits.
By Jessica Mireille. Diode. Published at Sunday, October 29th 2017, 18:39:17 PM. A simplified planar silicon diode is illustrated in Fig. 2.0.3. Using this process for silicon diodes produces two differently doped layers of silicon, which form a ‘PN junction’. Undoped or ‘intrinsic’ silicon has a lattice structure of atoms, each having four valence electrons, but P type silicon and N type silicon are doped by adding a relatively very small amount of material having either an atomic structure with three valence electrons (e.g. Boron or Aluminium) to make P type, or five valence electrons (e.g. Arsenic or Phosphorus) to make N type silicon. These doped versions of silicon are known as ‘extrinsic’ silicon. The P type silicon now has a shortage of valence electrons in its structure, which can also be considered to be a surplus of ‘holes’ or positive charge carriers, whereas the N type layer is doped with atoms having five electrons in its valence shell and therefore has a surplus of electrons which are negative charge carriers.
By Bertille Solange. Diode. Published at Saturday, October 28th 2017, 18:33:02 PM. When the polarity of the battery is such that electrons are allowed to flow through the diode, the diode is said to be forward-biased. Conversely, when the battery is “backward” and the diode blocks current, the diode is said to be reverse-biased. A diode may be thought of as like a switch: “closed” when forward-biased and “open” when reverse-biased.
By Alix Loane. Circuit. Published at Thursday, October 26th 2017, 18:28:29 PM. Electronic signals are represented either by voltage or current. The timedependent characteristics of voltage or current signals can take a number of forms including DC, sinusoidal (also known as AC), square wave, linear ramps, and pulsewidth modulated signals. Sinusoidal signals are perhaps the most important signal forms since once the circuit response to sinusoidal signals are known, the result can be generalized to predict how the circuit will respond to a much greater variety of signals using the mathematical tools of Fourier and Laplace transforms.
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