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Reactance is a result of inductance. Inductance is a result of a changing magnetic flux cutting a wire or let say, a coil, or, a result of a moving conductor cutting a magnetic field.
DC motors are inductors i.e they have reactance. This happen as soon as the armature starts rotating. The armature is moving in the magnetic field of the field windings thus an emf is induced in them as the armature conductors start cutting the field. It's this emf that limits the armature current once the motor is in motion.
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Why is the torque speed characteristics of a universal motor on ac source different from the torque speed characterisctic of the same motor on a dc source?
The torque-speed characteristics of a universal motor differ between AC and DC sources primarily due to the effects of reactance and phase differences in AC operation. When powered by AC, the inductance of the motor introduces additional impedance, which can lead to a reduction in torque at higher speeds due to increased reactance. In contrast, when powered by DC, the motor operates without these reactance effects, allowing for a more linear torque-speed curve with higher torque at lower speeds. Consequently, the performance characteristics shift significantly between the two power sources.
Why load angle is positive for generator and negative for motor?
simply put a motor consumes power and a generator produces it. reactance of a generator = - reactance of a motor
Why is there no inductive reactance in DC circuits?
Inductive reactance is a resistance by inductors to the change of current flow, and is dependent on the frequency at which the current oscillates. DC current flows in only one direction so an inductor's impedance remains the same.
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
Why inductor and capacitor works only for alternating currents?
Actually they work fine for both AC and DC, its just that DC is the limiting case where the inductive reactance falls to zero and the capacitive reactance rises to infinity.The other limiting case is infinite frequency (but of course this is not reached in practice, but if it could they work fine too) where the inductive reactance rises to infinity and the capacitive reactance falls to zero.
What happen when a DC shunt motor is connected to ac supply?
If it is a series motor it may still work. If it is a shunt motor it will not work , it will produce a humming noise and get heated. The shunt fields normally have high reactance so the field current will be drastically reduced, which may not be able to create the requisite torque.
What is a DC shunt motor?
A DC shunt motor is a motor using DC supply with the the inductor connected parallel to the armature.
What are uses of bidirectional dc motor?
6V dc motor
What is dc motor with synchoronous operation?
A synchronous motor is an ac motor that does not run on dc.
What is the value of capacitive reactance for DC?
Capacitive reactance Xc is equal to 1/2pi*f*C, wher f is input frequency and C is capacitance. Since for DC frequency is zero(no variation with time) Xc is infinite ideally and very very high practically.
Can DC series motor work on ac and DC and why?
A dc series motor can work on dc and ac because dc motors are totally reversible.
Can a DC dynamo act as a DC motor?
Yes it can and the otherway aroud a DC motor can be used as a dynamo
