- 1 How does an induction motor works?
- 2 Where is induction motor used?
- 3 How do induction motors generate electricity?
- 4 How does an induction motor develop torque?
- 5 Is AC motor and induction motor same?
- 6 When is induction motor used?
- 7 What is the purpose of induction motor?
- 8 What is the efficiency of induction motor?
- 9 How much power can a DC motor generate?
- 10 Can a squirrel cage induction motor generate electricity?
- 11 Can you turn a generator into a motor?
- 12 How do you calculate induction motor speed?
- 13 What are the characteristics of induction motor?
- 14 Why is speed control of induction motor necessary?
How does an induction motor works?
The magnet fields induced within the rotor are attracted to the magnetic field being produced by the stator, following it as it rotates with each half-cycle of alternating current. This type of motor is called an induction motor because the magnetic field created in the stator induces a magnetic field in the rotor.
Where is induction motor used?
These are the most common type of AC motor and are important to industry due to their load capacity, with Single-Phase induction motors being used mainly for smaller loads, for example in household appliances whereas, Three-Phase induction motors are used more in industrial applications including compressors, pumps,
How do induction motors generate electricity?
An induction generator produces electrical power when its rotor is turned faster than the synchronous speed. For a typical four-pole motor (two pairs of poles on stator) operating on a 60 Hz electrical grid, the synchronous speed is 1800 rotations per minute (rpm).
How does an induction motor develop torque?
An induction motor develops torque by inducing current to the rotor, which is proportional to the differential speed of the rotor and the rotating magnetic field in the stator. Due to the torque variation at each revolution the instantaneous speed will vary.
Is AC motor and induction motor same?
The two main types of AC motors are induction motors and synchronous motors. The induction motor (or asynchronous motor) always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding.
When is induction motor used?
The single-phase induction motors are used in low power applications. These motors are widely used in domestic and industrial applications. Some of the applications are mentioned below:
- Small fans.
- High speed vacuum cleaners.
- Electric shavers.
- Drilling machines.
What is the purpose of induction motor?
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor.
What is the efficiency of induction motor?
Efficiency of three-phase induction motors can vary from 85% to 96%. See the chart below for torque vs. slip. Induction motors of 50-100 HP for industrial applications vary in weight from 700 to almost 1,000 lbs.
How much power can a DC motor generate?
Typical DC motors may operate on as few as 1.5 Volts or up to 100 Volts or more. Roboticists often use motors that operate on 6, 12, or 24 volts because most robots are battery powered, and batteries are typically available with these values. Operating Current.
Can a squirrel cage induction motor generate electricity?
Induction generators Three phase squirrel cage induction motors can also be used as generators. For the motor to work as a generator instead of a motor the rotor must be spun faster than its stator’s synchronous speed. This will cause the motor to generate power after building up its residual magnetism.
Can you turn a generator into a motor?
In principle, any electrical generator can also serve as an electric motor, or vice versa. In hybrid vehicles and other lightweight power systems, a “motor–generator” is a single electric machine that can be used as an electric motor or a generator, converting between electrical power and mechanical power.
How do you calculate induction motor speed?
Therefore, for a 60-Hz system, the formula would be:
- 60 x 60 x 2 = 7,200 no-load rpm Ã· number of poles.
- 50 x 60 x 2 = 6,000 no-load rpm Ã· number of poles.
- A two-pole motor operates at 3,600 rpm (7,200 rpm Ã· 2) unloaded, and approximately 3,450 under load.
What are the characteristics of induction motor?
Because of this speed difference, the motor rotates at a speed slightly slower than the synchronous speed. Slip is normally expressed in percentage. Slip of a power induction motor is 2 to 3% when the motor is operated under the rated load. The above value becomes somewhat larger with small single-phase motors.
Why is speed control of induction motor necessary?
Induction motors do not run at synchronous speed, they are generally fixed speed motors. In Industries mechanical loads should not only be driven but should also be driven at desired speed. Therefore, the need of speed control methods for induction motor arises.