How can we reduce psychological reactance?
Having a feeling of choice can reduce the sense that our freedoms are being taken away from us. Combine autonomy with certainty (above) by communicating the certitude of inevitable action while seeking out other areas where you can give back control. Being playful with your language has been shown to reduce reactance.
How is reactance calculated?
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. L = the inductance value of the coil in henries.
What is XC and XL?
Now when you type a reactance and frequency, you can calculate L and C at that frequency. XL is called as inductive reactence and Xc is called as capacitive reactence. and the formulae[ XL = 2∏fL, XC = 1/2∏fC ] is given in that website. At resonance the reactence will be same for both cacitence and inductance.
What’s the difference between impedance and resistance?
Resistance is simply defined as the opposition to the flow of electric current in the circuit. Impedance is opposition to the flow of AC current because of any three components that is resistive, inductive or capacitive. It is a combination of both resistance and reactance in a circuit.
What is called reactance?
In electric and electronic systems, reactance is the opposition of a circuit element to the flow of current due to that element’s inductance or capacitance. As frequency increases, inductive reactance also increases and capacitive reactance decreases.
What is difference between reactance and resistance?
Resistance and reactance are the properties of an electrical circuit that opposes the current. The main difference between reactance and resistance is that resistance measures the opposition to a flow of current, whereas reactance measures the opposition to a change in current.
What is difference between inductance and reactance?
Inductance is a physical property of the coil or conductor, units in Henries, and is independent of the frequency of the signal in the component. Reactance, in units of Ohms, is dependent on the frequency of the signal.
What is reactance voltage?
Reactance Voltage: The voltage rise in the short circuit coil due to inductive property of the coil, which opposes the current reversal in it during the commutation period, is called the reactance voltage. We can produce reversing emf in two ways. By brush shifting.
What is voltage commutation?
Class C Commutation ( Voltage or Complementary or Type C Commutation ) The class C commutation is also called as voltage commutation because the SCR is turned off by applying reverse voltage across it. The SCR T1 is main SCR which is connected in series with load.
What is commutation process?
Commutation in DC machines is the process by which the reversal of current takes place. In DC generator this process is used to convert the induced AC in the conductors to a DC output. In DC motors commutation is used to reverse the directions of DC current before being applied to the coils of the motor.
What is poor commutation?
A machine is said to be in poor commutation if there is sparking at the brushes and commutator surface. Poor commutation can be caused by mechanical or electrical condition. Mechanical conditions include : 1) Uneven commutator surface. 2) Non uniform brush pressure.
What is commutation in motor?
Commutation refers to converting DC into AC inside the motor, and is done, in a DC motor via commutators. In a typical brushed DC motor, at the very least there is one winding on the rotor (collectivelty called “armature”) that are connected to the commutators at one end. A pair of brushes contacts the commutators.
Why commutator is needed?
All generators produce a sine wave, or AC currents when the rotor turns in the magnetic field. The commutator on the DC generator converts the AC into pulsating DC. The commutator assures that the current from the generator always flows in one direction.
Why do we use commutator in circuit diagram?
As the shaft rotates, the commutator reverses the flow of current in a winding. In both the motor and generator case, the commutator periodically reverses the direction of current flow through the winding so that current flow in the circuit external to the machine continues in only one direction.
Is commutator a rectifier?
Rectifier is used to convert an AC electricity to DC electricity, whereas Commutator is used to change the current direction, like, to make it periodic, like, on armature. Rectifier is stationary component. Commutator isn’t.
Why commutators are sparking heavily?
Sparking can be caused by numerous conditions like motor overload, vibration, high humidity, worn brushes and worn commutators. When checking for sparking or arcing, a good visual inspection of thecommutator and brushes will have to be performed.
What is the difference between commutator and slip ring?
Physically, a slip ring is a continuous ring, whereas a commutator is segmented. Functionally, slip rings provide a continuous transfer of power, signals, or data. Commutators, on the other hand, are used in DC motors to reverse the polarity of current in the armature windings.
Why do we use slip rings in AC generator?
The function of slip ring in an AC generator is that these are the hollow rings that are connected to the ends of the armature coil. They help in rotation of the coil. Also, they provide electric contact with the brushes. A slip ring in an electric motor is used an electrical joint to transmit power.
Where is slip ring used?
A slip ring is a method to make an electrical connection from a stationary object to a rotating assembly. These are used in many industrial automation applications and for equipment like tower and jib cranes, as well as cable and hose winders, where a portion can spin freely, while the base is fixed.
How does a commutator change AC to DC?
Commutator works like a reversing switch. Each time when a coil passes through magnetic neutral axis, commutator reverses its connection so that the load current becomes unidirectional or DC.
What are the three basic part of an electric motor?
No matter the type of motor, there are three basic parts: a stator, a commutator, and a rotor. Together they use electromagnetism to cause the motor to spin.
How do you make an electric motor more powerful?
We can increase the turning force (or torque) that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can increase the electric current flowing through the wire, or we can make the coil so it has many “turns” (loops) of very thin wire instead of one “turn” of thick wire.
What are the types of electric motor?
Types of Electric Motors
- 1). DC Shunt Motor.
- 2). Separately Excited Motor.
- 3). DC Series Motor.
- 4). PMDC Motor.
- 5). DC Compound Motor.
- 1). Synchronous Motor.
- 2). Induction Motor.
- 1). Stepper Motor.
What are the two main components of an electric motor?
Every electric motor has two essential parts: one stationary, and one that rotates. The stationary part is the stator. Though configurations vary, the stator is most often a permanent magnet or row of magnets lining the edge of the motor casing, which is usually a round plastic drum.