Transformer with relatively movable sections

Claim 2

A transformer comprising: a core of magnetic material consisting of first and second Ushaped sections which are rotatable relative to one another about an axis of the core; a primary winding provided on one of said core sections; a secondary winding provided on the other of said core sections; and a ring-shaped section of magnetic material at the outer part of said core, the axis of said ring-shaped section lying along the axis of said core; wherein each of said first and second U-shaped sections comprises a first limb extending along the axis of the core, a body which extends radially outwardly from the first limb, and a second limb which extends in an axial direction from an outer end of said body to the ring-shaped section; whereby the core can provide, in each position assumed by one core section relative to the other during rotation about said axis, a low reluctance magnetic flux generated by an alternating current flowing in one winding to link the other winding and to cause an electromotive force to be induced in that other winding.

Claim 3

A transformer according to claim 1, wherein said ring-shaped section is a flat strip of magnetic material wound into the shape of a ring.

Claim 4

A transformer according to claim 1, wherein said ring-shaped section is formed with a narrow slit to reduce circulating electric currents therein.

Claim 5

A transformer according to claim 1, further comprising a generally cylindrical metal casing formed of two parts which are mounted for rotation relative to one another about the axis of the casing, said casing enabling said transformer to be used in explosive atmospheres.

Claim 6

A transformer comprising: a core of magnetic material consisting of first and second E-shaped sections which are rotatable relative to one another about an axis of the core; a primary winding provided on one of said core sections; a secondary winding provided on the other of said core sections; and a ring shaped section of magnetic material at the outer part of said core, the axis of said ring-shaped sector lying along the axis of said core; wherein each of said first and second E-shaped sections comprises a first limb extending along the axis of the core, a first body portion which extends radially outwardly from the first limb, a second limb which extends in an axial direction from the outer end of said first body portion to the ring-shaped section, a second body portion which extends radially outwardly from said first limb along the longitudinal axis of the first body portion away from said second limb, and a third limb extending in an axial direction from the outer end of said second body portion opposite said second limb, said second and third limbs extending toward diametrically opposite locations on said ring-shaped section.

Claim 7

A transformer comprising: a core of magnetic material consisting of first and second E-shaped sections which are rotatable relative to one another about an axis of the core; a primary winding provided on one of said core sections; a secondary winding provided on the other of said core sections; and a ring shaped section of magnetic material at the outer part of said core, the axis of said ring-shaped sector lying along the axis of said core; wherein each of said first and second E-shaped sections comprises a first limb extending along the axis of the core, a first body portion which extends radially outwardly from the first limb, a second limb which extends in an axial direction from the outer end of said first body portion to the ring-shaped section, a second body portion which extends radially outwardly from said first limb along the longitudinal axis of the first body portion away from said second limb, and a third limb extending in an axial direction from the outer end of said second body portion opposite said second limb, said second and third limbs extending toward diametrically opposite locations on said ring-shaped section.

Claim 8

A transformer according to claim 5, wherein said ring-shaped section is a flat strip of magnetic material wound into the shape of a ring.

Claim 9

A transformer according to claim 5, wherein said ring-shaped section is formed with a narrow slit to reduce circulating electric currents therein.

Claim 10

A transformer according to claim 5, further comprising a generally cylindrical metal casing formed of two parts which are mounted for rotation relative to one another about the axis of the casing, said casing enabling said transformer to be used in explosive atmospheres.