Contents
How is inductive load measured?
In inductors, voltage leads current by 90 degrees. The formula for calculating the inductive reactance of a coil is: inductive reactance, or XL, is the product of 2 times p (pi), or 6.28, the frequency of the ac current, in hertz, and the inductance of the coil, in henries. XL =2p x f x L.
What is the effect of inductive load?
Reactive/Inductive Load – An inductive load converts current into a magnetic field. Inductive reactance resists the change to current, causing the circuit current to lag voltage. Examples of devices producing reactive/inductive loads include motors, transformers and chokes.
What is the effect of an inductive load on an ac supply?
In the purely inductive circuit above, the inductor is connected directly across the AC supply voltage. As the supply voltage increases and decreases with the frequency, the self-induced back emf also increases and decreases in the coil with respect to this change.
What is the difference between resistive and inductive load?
In resistive loads, such as light bulbs, the voltage and current waves match, or the two are in phase. As you might guess from the name, resistive loads only resist the current and are the simplest type of load. In inductive loads, such as an electric motor, the voltage wave is ahead of the current wave.
Is a power supply an inductive load?
Figure 1 shows an inductive load connected to a DC power supply. When the power supply is turned on, current flows through the coil and a magnetic field builds up around the inductor. That magnetic field is a source of potential energy.
When to add protection to an inductive load?
relays commonly drive inductive loads that include motor windings, solenoids, interposing relay coils, physical inductors, and even the load wiring itself. In all cases, we routinely recommend that protection be placed local to the inductive load being switched.
Which is the best diode for inductive load protection?
Diode Protection The best solution is to put a diode across the inductor, as shown at left. The diode must be able to handle the initial diode current, which equals the steady current that had been flowing through the inductor; something like a 1N4004 is fine for many cases.
Can an inductive load damage a DC power supply?
If you’re using a DC power supply to power DC motors, solenoids, fans, relays and other inductive loads, you need some kind of circuit protection. Without this protection, your power supply can be damaged by high voltage spikes from these devices. Figure 1 shows an inductive load connected to a DC power supply.
What should be the voltage of an inductive load?
Ensure that the chosen components are suitably rated for the inductance and energy to be dissipated. The peak reverse voltage ratings should be a minimum of two times the power supply maximum output voltage. The continuous forward current ratings should be a minimum of 1.5 times the power supply maximum output current.