Coil structures
AssigneeTechnelec Ltd
InventorsRichard Pollock, James Nicholls, Peter Dackus, Abigail Cumming
Life of this patent
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Abstract
A coil structure for an electromagnetic device comprising a conductor configured to provide a coil comprising one or more coil turns around a magnetic core to induce a magnetic flux in the magnetic core when in use. The conductor comprises one or more a first parts comprising a plurality of sub-conductors in parallel, and one or more second parts coupled in series with the first part(s), wherein the or each second part comprises a single sub-conductor or a lesser number of sub-conductors in parallel.
Claims17
An electric motor comprising:
- a stator comprising a first magnetic core and a coil structure;
- and
- a rotor configured to rotate about an axis, the rotor comprising a second magnetic core,
- wherein there is an airgap between the first and second magnetic cores,
- wherein the coil structure comprises a conductor configured to provide a coil comprising one or more coil turns around the first magnetic core to induce a magnetic flux in the first magnetic core when in use, the conductor comprising:
- one or more first parts comprising a plurality of sub-conductors in parallel;
- and
- one or more second parts coupled in series with the first part(s), wherein the or each second part comprises a single sub-conductor or a lesser number of sub-conductors in parallel, wherein at least one coil turn comprises a first part of the one or more first parts and a second part of the one or more second parts and a transition between the first and second parts occurs substantially at both axially outer ends of the first magnetic core, and wherein the or each coil turn is arranged around the magnetic core of the stator so that the or each first part of the conductor is located in a stator slot of the stator and closer to the airgap than at least one of the second parts of the conductor.
A method of forming a coil structure for an electric motor and comprising one or more coils, the method comprising:
- forming a substantially U-shaped part by additive manufacturing;
- inserting a magnetic core in the substantially U-shaped part;
- forming a top part;
- and
- fixing the top part to the substantially U-shaped part to provide, for the or each coil, a continuous conductor providing one or more coil turns around the magnetic core;
- wherein the coil structure is for a stator of the electric motor having a rotor configured to rotate about an axis, the coil structure comprising a conductor configured to provide a coil comprising one or more coil turns around a magnetic core of the stator to induce a magnetic flux in the magnetic core when in use, the conductor comprising:
- one or more first parts comprising a plurality of sub-conductors in parallel;
- and
- one or more second parts coupled in series with the first part(s), wherein the or each second part comprises a single sub-conductor or a lesser number of sub-conductors in parallel, and wherein at least one coil turn comprises a first part of the one or more first parts and a second part of the one or more second parts and a transition between the first and second parts occurs substantially at both axially outer ends of the magnetic core.
Dependencies are inferred from the claim text.