초록 ▼

The invention is a compensator for minimizing circulatory current losses generated in a winding of an electric machine, the compensator comprising a frame part made of a magnetically conductive material and a winding formed in the frame part, the winding comprising at least one conductor having at l

The invention is a compensator for minimizing circulatory current losses generated in a winding of an electric machine, the compensator comprising a frame part made of a magnetically conductive material and a winding formed in the frame part, the winding comprising at least one conductor having at least two sub-conductors; and at least one opening in said frame part. Said at least two sub-conductors extend through said at least one opening in such a way that the total current flowing through the opening is substantially zero, when a substantially equal current is led to the sub-conductors; and that at least two different sub-conductors are placed to extend through at least one opening. There is also disclosed an electric machine, the compensator being used in connection with the stator of the electric machine; and a method for forming a compensator to be used for minimizing circulatory current losses generated in a winding of an electric machine.

대표청구항 ▼

The invention claimed is: 1. A compensator to be used for minimizing circulatory current losses generated in a winding of a stator of an electric machine, said winding of the stator comprising sub-conductors, the compensator comprising: a frame part comprising a magnetically conductive material; a

The invention claimed is: 1. A compensator to be used for minimizing circulatory current losses generated in a winding of a stator of an electric machine, said winding of the stator comprising sub-conductors, the compensator comprising: a frame part comprising a magnetically conductive material; a winding formed in the frame part, the winding comprising at least one conductor having at least two sub-conductors; and at least one opening in said frame part forming a closed magnetic circuit in the compensator; wherein said at least two sub-conductors of said winding of said compensator extend through said at least one opening such that a total current flowing through the opening is substantially zero when a substantially equal current is supplied to the sub-conductors of said winding of said compensator; wherein at least two different sub-conductors extend through at least one opening; and wherein a number of sub-conductors of the compensator is equal to a number of sub-conductors of the winding of the stator. 2. The compensator according to claim 1, wherein the compensator comprises two pieces, each piece comprising at least a first and a second cog, wherein said at least one opening is limited by the first and second cogs of said two pieces. 3. The compensator according to claim 1, wherein said at least one opening comprises a hole extending through the frame of the compensator. 4. The compensator according to claim 1 wherein said opening comprises a groove in the frame. 5. The compensator according to claim 1, wherein the sub-conductors of the compensator are arranged in groups, each group comprising sub-conductors having amplitudes and phases of currents flowing through the sub-conductors close to each other, measured with a sinusoidal current without the compensator. 6. The compensator according to claim 1, wherein each sub-conductor of the compensator comprises a solid wire or a Litz wire. 7. An electric machine, comprising: a stator comprising a winding comprising at least one conductor comprising at least two sub-conductors; and at least one compensator connected with said winding for minimizing circulatory current losses in connection with the winding of the electric machine, the compensator comprising a frame part of comprising a magnetically conductive material; a winding formed in the frame part, the winding comprising at least one conductor having at least two sub-conductors; and at least one opening in said frame part to form a closed magnetic circuit in the compensator; wherein said at least two sub-conductors of said compensator extend through at least one opening such that a total current flowing through said at least one opening is substantially, zero when a substantially equal current is supplied to the sub-conductors of said winding of said compensator, wherein at least two different sub-conductors extend through said at least one opening; and wherein a number or sub-conductors of the compensator is equal to a number of sub-conductors of the winding of the stator. 8. The electric machine according to claim 7, wherein said at least one opening is in connection with the magnetic circuit of the stator. 9. A compensator, comprising: a frame part comprising a magnetically conductive material; at least one opening in said frame part to form a closed magnetic circuit in the compensator; a winding formed in the frame part, the winding comprising at least one conductor having at least two sub-conductors connected together at both ends of the sub-conductors wherein a number or sub-conductors of the compensator is equal to a number of sub-conductors of a winding of a stator of an electric machine for which the compensator is used to minimize circulatory current losses generated in the winding of the stator; wherein each of said at least two sub-conductors of said compensator extends through said at least one opening in opposite directions. 10. The compensator according to claim 9, wherein the sub-conductors of said at least one conductor comprise NS sub-conductors, wherein the at least one opening of the compensator comprises at least NS−1 openings and each opening includes two different sub-conductors of the compensator.