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Power factor correction (PFC) can be done by passive or active circuits. Advances in semiconductor technology and low prices of control integrated circuits have made the use of active solutions for PFCs more appropriate for various applications. What is Power Factor (PF)?…
Modern DC and AC motors provide useful features when using electric motors as final control elements. Here are some common features that are seen in both VSDs and VFDs. Speed limiting Torque limiting Limitation of acceleration (speed of change) Limitation of deceleration…
What is zener diode regulator? Zener diode regulator is an electronic device designed to protect electrical and electronic devices sensitive to variations in potential difference or voltage and noise in the alternating current of the electrical distribution The zener regulator can regulate…
Electric motor is an essential electrical device in the home and industries. In general, in large organizations, an engine maintenance program is carried out in which the causes of the engine failures are identified and the necessary measures are taken to avoid…
Motor controllers range from a simple switch to a complex system that uses solenoids, relays and timers. The basic functions of a motor controller are to control and protect the operation of an engine. This includes starting and stopping the engine, and…
Piezoelectric actuators represent an important new group of actuators for active control of mechanical systems. Piezoelectric actuators is used to convert electrical energy into mechanical movement, for precise positioning to nanometric levels, to produce ultrasonic energy and sonar signals, and for the…
What is Multi-conductor cable? Multi-conductor cables are a single variation of twisted cable, and each cable houses at least two (and often many) different conductors within a common housing. Depending on the configuration, these cables can offer up to 60 different conductors,…
1. Why the capacitors works on ac only? Generally, the capacitor provides infinite resistance to the DC components (ie, blocks the DC components). allows alternating current components to pass through. 2. Explain the working principal of the circuit breaker? The circuit breaker…
1. What is “pu” in electrical engineering? Pu means per unit and this will be used in the diagram of a single line of the energy system, it is like a large electric circuit without components (generators, transformers, loads) with different classifications…
What are fixed resistors? The electrical behavior of a resistor obeys Ohm’s law for a constant resistance; however, some resistances are sensitive to heat, light or other variables. Resistors can have a fixed resistance value, or they can be made variable or…
