Rotor E.M.F. and Reactance Under Running Conditions
Let
E2 = standstill rotor induced e.m.f./phase
X2 = standstill rotor reactance/phase, f2 = rotor current frequency at standstill
When rotor is stationary i.e. s = 1, the frequency of rotor e.m.f. is the same as that of the stator supply frequency. The value of e.m.f. induced in the rotor at standstill is maximum because the relative speed between the rotor and the revolving stator flux is maximum. In fact, the motor is equivalent to a 3-phase transformer with a short-circuited rotating secondary.
When rotor starts running, the relative speed between it and the rotating stator flux is decreased. Hence, the rotor induced e.m.f. which is directly proportional to this relative speed, is also decreased (and may disappear altogether if rotor speed were to become equal to the speed of stator flux). Hence, for a slip s, the rotor induced e.m.f. will be s times the induced e.m.f. at standstill.
(i) rotor current at standstill with the rheostat is in the circuit.
(ii) when the slip-rings are short-circuited and motor is running with a slip of 3%.
(Elect.Engg. I, Nagpur Univ. 1993)
Related posts:
Incoming search terms:
- the frequency of the induced emf in an induction motor is
- rotor emf
- rotor reactance
- rotor emf frequency formula
- rotor induced emf
- emf equation of induction motor
- equation of rotor induced emf
- rotor emf formula
- the relation between the slip and frequency of rotor induced emf
- rotor reactance formula
- obtain the relation between slip and frequency of rotor induced emf
- rotor emf equation
- Equation of rotor induced emf frequency and Current of 3 phase induction motor
- induction motor emf equation
- rotar emf of induction motor
- what is rotor emf
- rotor emf of induction motor
- frequency of roter induced emf formula
- rotor reactance of induction motor
- Frequency of rotor current at standstill
- frequency of rotor emf formula
- rotar reactance
- frequency of rotor induced emf in induction motor
- rotor emf equation of 3-phase induction motor
- relation between rotor current frequency and supply frequency under running condition
- how to find the rotor induced emf frequency
- the frequency of the induced
- state the relation between rotor current frequency and supply frequency under running condition
- roter induced emf per phase formula
- frequency of induced emf in induction motor
- under running condition the rotor reactance is directly proportional to
- rotor frequency at stand still#spf=1
- relation in iduction moter frequency or roter emf
- impedance in running condition of motor
- rotor emf and rotor frequency
- how to find value of stand still reactance of induction motor
- rotor emf and frequency
- rotor emf and reactance under running condition
- Rotor emf eqution
- Relation between rotoe emf and frequncy suply to stator
- deduce the relationship between rotor current frequency and supply frequency in terms of slip
- define the term rotor emf
- emf equation of ac motor
- ror emf of induction motor
- induced emf in 3- phase induction motor
- relation b/w reactance and frequency of rotor emf in induction motor
- definition of rotor reactance
- how to calculate the frequency of the rotor emf
- rotor induced emf of induction motor
- rotor emf of 3phase induction motor