baldorartun
Üye
- Katılım
- 16 Haz 2007
- Mesajlar
- 5
- Puanları
- 1
- Yaş
- 39
The World Of Motors
By John Mazurkiewicz
Baldor Electric
The origin of the first machines devised to convert electrical energy to mechanical power can be traced to machines conceived by Michael Faraday. In 1831, he formulated the fundamental concepts of electromagnetism. These concepts basically state that if a conductor, or wire, carrying current is placed in a magnetic field as shown in Figure 1, a force will act upon it. The magnitude of this force depends upon the strength of the magnetic field and the amount of current passing through.
Figure 1 Electromagnetic Induction
Electric motors trace their origin back to 1831, when Michael Faraday formulated the fundamental concepts of electromagnetic induction. Faraday discovered he could induce a force on a current-carrying conductor by applying a magnetic field. The magnitude of the force is proportional to the strength of the field and the current in the conductor.
Current
Force
Electric motor design is based on the placement of conductors (wires) in a magnetic field. A winding has many conductors, or turns of wire, and the contribution of each individual turn or wire adds to the intensity of the interaction. The force developed from a winding is dependent on the current passing through the winding and the magnetic field strength. If more current is passed through the winding, then more force (torque) is obtained. In effect, two magnetic fields interacting cause movement: the magnetic field from the rotor and the magnetic field from the stators attract each other. This becomes the basis of both AC and DC motor design.
AC Motors
Most of the world’s motor business is addressed by AC motors. AC motors are relatively constant speed devices. The speed of an AC motor is determined by the frequency of the voltage applied (and the number of magnetic poles). There are basically two types of AC motors: induction and synchronous.
By John Mazurkiewicz
Baldor Electric
The origin of the first machines devised to convert electrical energy to mechanical power can be traced to machines conceived by Michael Faraday. In 1831, he formulated the fundamental concepts of electromagnetism. These concepts basically state that if a conductor, or wire, carrying current is placed in a magnetic field as shown in Figure 1, a force will act upon it. The magnitude of this force depends upon the strength of the magnetic field and the amount of current passing through.
Figure 1 Electromagnetic Induction
Electric motors trace their origin back to 1831, when Michael Faraday formulated the fundamental concepts of electromagnetic induction. Faraday discovered he could induce a force on a current-carrying conductor by applying a magnetic field. The magnitude of the force is proportional to the strength of the field and the current in the conductor.
Current
Force
Electric motor design is based on the placement of conductors (wires) in a magnetic field. A winding has many conductors, or turns of wire, and the contribution of each individual turn or wire adds to the intensity of the interaction. The force developed from a winding is dependent on the current passing through the winding and the magnetic field strength. If more current is passed through the winding, then more force (torque) is obtained. In effect, two magnetic fields interacting cause movement: the magnetic field from the rotor and the magnetic field from the stators attract each other. This becomes the basis of both AC and DC motor design.
AC Motors
Most of the world’s motor business is addressed by AC motors. AC motors are relatively constant speed devices. The speed of an AC motor is determined by the frequency of the voltage applied (and the number of magnetic poles). There are basically two types of AC motors: induction and synchronous.
