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A permanent magnet motor is a type of electric motor that uses permanent magnets for the field excitation and a wound armature. The permanent magnets can either be stationary or rotating; interior or exterior to the armature for a radial flux machine or layered with the armature for an axial flux topology.
An electropermanent magnet or EPM is a type of permanent magnet in which the external magnetic field can be switched on or off by a pulse of electric current in a wire winding around part of the magnet. The magnet consists of two sections, one of "hard" (high coercivity) magnetic material and one of "soft" (low coercivity) material. The ...
For an electromagnet with a cylindrical bore, producing a pure multipole field of order , the stored magnetic energy is: =!. Here, is the permeability of free space, is the effective length of the magnet (the length of the magnet, including the fringing fields), is the number of turns in one of the coils (such that the entire device has turns), and is the current flowing in the coils.
Paramagnetic materials are attracted to magnetic fields, hence have a relative magnetic permeability greater than one (or, equivalently, a positive magnetic susceptibility). The magnetic moment induced by the applied field is linear in the field strength, and it is rather weak. It typically requires a sensitive analytical balance to detect the ...
The dimension of a wide-flange I-beam. In the United States, steel I-beams are commonly specified using the depth and weight of the beam. For example, a "W10x22" beam is approximately 10 in (254 mm) in depth with a nominal height of the I-beam from the outer face of one flange to the outer face of the other flange, and weighs 22 lb/ft (33 kg/m).
NYPD divers Sunday continued to search the Central Park Boathouse pond for potential clues including the gun used in the slaying of UnitedHealthcare CEO Brian Thompson as cops were still hunting ...
As it is known today, there are only a few possible ways to reverse the magnetization of a metallic magnet: an applied magnetic field [5] spin injection via a beam of particles with spin [5] magnetization reversal by circularly polarized light; [6] i.e., incident electromagnetic radiation that is circularly polarized
During arguments at the U.S. Supreme Court in this week's major transgender rights case, liberal Justice Sonia Sotomayor told the lawyer defending Tennessee's ban on gender-affirming medical care ...
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