A magnetic device includes a winding, and insulators by which the winding is surrounded. Each of the insulators is in contact with the winding. A gap exists between each two adjacent of the insulators in a winding direction of the winding.

A magnetic device includes a winding, and insulators by which the winding is surrounded. Each of the insulators is in contact with the winding. A gap exists between each two adjacent of the insulators in a winding direction of the winding.

A winding is provided, which comprises a form element having a longitudinal axis defining a longitudinal direction and a radial direction perpendicular to the longitudinal axis. The form element comprises a core with a lateral surface, and adjustable elements arranged on the lateral surface of the core. The adjustable elements are elongated and extend along the longitudinal direction. A thickness of the adjustable elements in a radial direction is altered along the longitudinal direction. A conductor is wound around the form element along the longitudinal direction forming turns of the winding.

A winding is provided, which comprises a form element having a longitudinal axis defining a longitudinal direction and a radial direction perpendicular to the longitudinal axis. The form element comprises a core with a lateral surface, and adjustable elements arranged on the lateral surface of the core. The adjustable elements are elongated and extend along the longitudinal direction. A thickness of the adjustable elements in a radial direction is altered along the longitudinal direction. A conductor is wound around the form element along the longitudinal direction forming turns of the winding.

A secondary bobbin of a high-voltage transformer and a portable plasma device including the same are provided to regulate discharge voltage. The secondary bobbin of the high-voltage transformer includes: a main body; barrier portions dividing the main body into a predetermined number of multiple segments along the length of the main body; winding portions where a coil is wound on the multiple segments into which the main body is divided; and switch circuit portions connecting neighboring barrier portions by a switch, wherein the switch circuit portions electrically connect or disconnect the winding portions to adjust the number of turns depending on whether the switch circuit portions are on or off.

A secondary bobbin of a high-voltage transformer and a portable plasma device including the same are provided to regulate discharge voltage. The secondary bobbin of the high-voltage transformer includes: a main body; barrier portions dividing the main body into a predetermined number of multiple segments along the length of the main body; winding portions where a coil is wound on the multiple segments into which the main body is divided; and switch circuit portions connecting neighboring barrier portions by a switch, wherein the switch circuit portions electrically connect or disconnect the winding portions to adjust the number of turns depending on whether the switch circuit portions are on or off.

Disclosed are semi non-magnetic bobbins for use in core reactors, and core reactors that include the semi non-magnetic bobbins. The semi non-magnetic bobbins are made of a non-metallic material and provide core reactors that can withstand high temperatures and at the same time avoid eddy current effects. The disclosed semi non-metallically permeable bobbins also do not adversely affect electrical power quality and save power and can be used to capture harmonics currents. When properly designed and arranged can be used to provide electromagnetic induction heaters using harmonics currents imported from an electrical power system as the working source of heat and provide a zero-cost heating process.

Disclosed are semi non-magnetic bobbins for use in core reactors, and core reactors that include the semi non-magnetic bobbins. The semi non-magnetic bobbins are made of a non-metallic material and provide core reactors that can withstand high temperatures and at the same time avoid eddy current effects. The disclosed semi non-metallically permeable bobbins also do not adversely affect electrical power quality and save power and can be used to capture harmonics currents. When properly designed and arranged can be used to provide electromagnetic induction heaters using harmonics currents imported from an electrical power system as the working source of heat and provide a zero-cost heating process.

A winding method for radial magnetic bearing stator, a radial magnetic bearing stator and a radial magnetic bearing. The winding method for radial magnetic bearing stator includes: S110, sleeving a first formed stator winding on a first stator tooth of a stator core along a radial outward direction; S120, sleeving a second formed stator winding on a second stator tooth of the stator core along a radial outward direction; S130, a first coil of the first formed stator winding is connected in series with a second coil of the second formed stator winding; the first stator tooth is adjacent to the second stator tooth, and a stator slot is formed therebetween; and the coil number of the first formed stator winding is larger than that of the second formed stator winding.

A coil wire includes a core wire and a winding wire. The winding wire is wound around a circumference of the core wire so as to form a plurality of spirals. The coil wire satisfies one of: (i) an outer surface of the core wire is exposed, and a distance between the outer surface of the core wire and an inner circumferential surface of part of the winding wire is smaller than a thickness of a first insulating film coated on the winding wire; or (ii) the outer surface of the core wire is coated by a second insulating film, and a distance between an outer surface of the second insulating film and the inner circumferential surface of part of the winding wire is smaller than a thickness of a thicker one of the first insulating film and the second insulating film.