How does eddy current drive work?
An eddy current drive controls speed by regulating a direct-current (DC) excitation coil on a magnetic rotor, rotating concentrically with a steel drum, driven by the motor at full speed. Like the pumps and electric motors that drive them, eddy current drives are rotating machines.
How eddy current is used in induction motor?
Induction Motor: If the magnetic field is rotated with respect to the stationary axle, eddy currents are developed in it. The eddy currents thus produced try to reduce the relative motion by rotating the axle in the same direction of rotation of the magnetic field. This is the principle of an induction motor.
What is ment by eddy current drive?
An eddy current drive, also known generically as a magnetic drive, eddy current clutch or magnetic clutch, is an electro-mechanical variable speed drive that uses a constant speed motor as the input. The eddy current drive is installed between the motor and the driven equipment.
On what principle does the generation of eddy currents works?
The eddy current method is based on the principle of generating circular electrical currents (eddy currents) in a conductive material. This is achieved by the use of a coil connected to an alternating current generator driving an alternating magnetic field (primary field).
What is difference between eddy current and induced current?
What is the difference between eddy current and induced current? Eddy currents are generated within the material, and induced currents are created within a closed circuit. Eddy currents are independent of the area of the conductor, but induced currents are dependent on the area covered by the circuit.
What is the main use of AC drive?
An AC drive is a device used to control the speed of an electrical motor in order to: enhance process control. reduce energy usage and generate energy efficiently. decrease mechanical stress on motor control applications.
How are eddy currents used in induction furnace?
In the induction furnace, a coil carrying alternating electric current surrounds the container or chamber of metal. Eddy currents are induced in the metal (charge), the circulation of these currents producing extremely high temperatures for melting the metals and for making alloys of exact composition.
What are eddy currents two applications of eddy current?
Magnetic brakes in trains. Electromagnetic damping. Induction furnaces.
Is eddy current used in induction furnace?
Eddy currents are driven into the coil so that by creating high temperatures that are required for melting and producing the alloys, these currents are distributed. Therefore, induction furnaces make use of eddy current.
What are eddy currents give two important properties of these currents?
Properties. Eddy currents in conductors of non-zero resistivity generate heat as well as electromagnetic forces. The heat can be used for induction heating. The electromagnetic forces can be used for levitation, creating movement, or to give a strong braking effect.
How does the eddy current principle work?
The Eddy Current Principle works as the Self-inductance. One must note that Eddy currents can be induced within nearby static conductors by a time-varying magnetic field created by an AC electromagnet or transformer.
What is an eddy current drive (ECD)?
An eddy current drive, also known generically as a magnetic drive, eddy current clutch or magnetic clutch, is an electro-mechanical variable speed drive that uses a constant speed motor as the input. The eddy current drive is installed between the motor and the driven equipment.
How does an eddy current react with a magnetic field?
By Lenz’s law, an eddy current creates a magnetic field that opposes the change in the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field. For example, a nearby conductive surface will exert a drag force on a moving magnet that opposes its motion,…
What is an electeddy current flow?
Eddy current flow can be created when there is a conductor movement across the magnetic field or when there is variety in the magnetic field that encases the fixed channel.