Table of Contents
- 1 Why frequency of rotor & stator is different?
- 2 What is the frequency of rotor current of a 50Hz induction motor operating at 2 slip?
- 3 How do you find the frequency of a rotor current?
- 4 What is the frequency of rotor current of a 50 Hz induction motor?
- 5 What is the difference between rotor frequency and stator frequency?
- 6 What is the rotor frequency of a 50Hz motor?
Why frequency of rotor & stator is different?
The lag earlier was maximum and as the speed of the motor increases, the lag decreases. Hence the rotor frequency decreases from 50Hz to lesser values in the range you have mentioned ,i.e. , 2Hz which depends upon the difference of speed of rotation of stator flux and the rotor.
What is the frequency of rotor current of a 50Hz induction motor operating at 2 slip?
Rotor frequency is the product of slip and the stator frequency. In this case, if the stator frequency is 50Hz, then the rotor frequency will be 2Hz.
What is the rotor frequency when a motor switched on?
When a 3-phase induction motor is switched on, then rotor speed is equal to zero. Hence, at starting or When a 3 phase induction motor is switched on, the rotor frequency is equal to supply frequency.
What is the relation between frequencies of stator and rotor current?
The frequency of the rotor current fr = Ns x P/120, so fr = 0 if the slip is zero. If the operating speed is zero, Ns = N and the frequency of the rotor current is the same as the frequency of the stator current.
How do you find the frequency of a rotor current?
The frequency of the rotor current fr = Ns x P/120, so fr = 0 if the slip is zero. If the operating speed is zero, Ns = N and the frequency of the rotor current is the same as the frequency of the stator current . f = source frequency in Hz.
What is the frequency of rotor current of a 50 Hz induction motor?
2 Hz
Explain the working principle of a three phase induction motor. A 50 Hz, 4-pole induction motor has an emf in the rotor. The frequency of the rotor current is 2 Hz. Determine the (i) the synchronous speed, (ii) the slip, (iii) the speed of the motor.
What is the difference between synchronous speed and rotor speed?
Induction motor with squirrel cage rotor has two different speeds. The synchronous speed refers to the stator rotating magnetic field, which depends on the number of poles and frequency. The other speed is the rotor’s. The rotor speed will be always slower than the stator speed, we call it slip.
What is frequency of rotor emf?
The frequency of the induced emf in rotor is? Explanation: The induced frequency will be f = P(Ns-Nr)/2. f = 4(1500-1450)/2 = 100 Hz.
What is the difference between rotor frequency and stator frequency?
It depends on the motor itself, and the load. When motoring the rotor frequency is always lower than the stator frequency. The difference between these two frequencies is called the slip. The amount of slip depends on the input power, the applied load, and the characteristics of the specific motor.
What is the rotor frequency of a 50Hz motor?
The Rotor will rotate at a speed close to the field rotation speed and will lag behind (slip) in proportion to the mechanical load on the rotor. While the field rotation for a 7.5 kW 4-Pole Motor at 50 Hz is 1500 RPM The rotor frequency will be typically 1470m at full load.
How do you calculate the operating speed of a stator?
The operating speed No = N – Ns where Ns is the slip speed. The frequency of the rotor current fr = Ns x P/120, so fr = 0 if the slip is zero. If the operating speed is zero, Ns = N and the frequency of the rotor current is the same as the frequency of the stator current.
What is the synchronous speed of the rotor in rpm?
The synchronous speed of the rotor in RPM N = 120f/P where f is the frequency of the stator current and P is the number of poles. The operating speed No = N – Ns where Ns is the slip speed.