Frequency converter

Patent metadata

Field	Value
Publication number	US-9755552-B2
Application number	US-201314388199-A
Country	US
Kind code	B2
Filing date	Mar 22, 2013
Priority date	Mar 27, 2012
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A frequency converter includes: a primary winding 12 in which a plurality of windings on which a polyphase alternating voltage is applied are arranged periodically along a particular direction; a secondary winding 22 which is magnetically coupled to the primary winding 12 and in which a plurality of windings are arranged along the particular direction with a repetition period different from the primary winding 12 ; and a frequency modulation part 3 which is arranged on a magnetic path between the primary winding 12 and the secondary winding 22 and in which a plurality of magnetic materials 31 are arranged periodically. Then, the pitch of the plurality of magnetic materials 31 and the winding arrangement period of the primary winding 12 and the secondary winding 22 are different from each other so that an alternating voltage having a frequency different from the frequency of the polyphase alternating voltage is induced in the secondary winding 22.

First claim

The invention claimed is:

1. A frequency converter comprising:
a first winding in which a plurality of windings on which a polyphase alternating voltage is applied are arranged approximately with equal pitch along a particular direction;
a second winding which is magnetically coupled to the first winding and in which a plurality of windings are arranged along the particular direction with different pitch from the first winding; and
a magnetic material row which is arranged on a magnetic path between the first and the second winding magnetically coupled to each other and in which a plurality of magnetic materials are arranged approximately with equal pitch along the particular direction, wherein
the first winding, the second winding and the magnetic material row are non-movable parts, and
a number of the plurality of magnetic materials in the particular direction and a number of repeated patterns of the plurality of windings of the first and the second winding are different from each other
so that an alternating voltage having a frequency different from the frequency of the polyphase alternating voltage is induced in the second winding and the second winding outputs the alternating voltage.

2. The frequency converter according to claim 1 , wherein
the first and the second winding and the magnetic material row satisfy the following formula,
P=L±H

where
P: number of the plurality of magnetic materials in the particular direction,
L: number of repeated patterns of the plurality of windings of the first winding in the particular direction, and
H: number of repeated patterns of the plurality of windings of the second winding in the particular direction.

3. The frequency converter according to any one of claim 1 , comprising
a cylindrical holding member holding the magnetic material row, wherein
the particular direction is a circumferential direction of the holding member and the first winding and the second winding are arranged in a manner such as to generate a periodic magnetic field along the circumferential direction.

4. The frequency converter according to claim 3 , wherein
the first winding and the second winding
are arranged in such a manner that a winding axis is directed to a center of the holding member.

5. The frequency converter according to any one of claim 1 , comprising
a disk-shaped holding member holding the magnetic material row, wherein
the particular direction is a circumferential direction of the holding member and the first winding and the second winding are arranged in a manner such as to generate a periodic magnetic field along the circumferential direction.

6. The frequency converter according to claim 5 , wherein
the first winding and the second winding
are arranged in such a manner that a winding axis is approximately perpendicular to the holding member.

7. A frequency converter comprising:
a first winding in which a plurality of windings on which a polyphase alternating voltage is applied are arranged approximately with equal pitch along a particular direction;
a magnet row which is magnetically coupled to the first winding and in which a plurality of magnetic pole pairs are arranged along the particular direction with different pitch from the first winding,
a magnetic material row which is arranged on a magnetic path between the first winding and the magnet row magnetically coupled to each other and in which a plurality of magnetic materials are arranged approximately with equal pitch along the particular direction; and
a second winding in which a plurality of windings are arranged between the plurality of magnetic materials or alternatively wound around each magnetic material, wherein
the first winding, the magnet row, the magnetic material row and the second winding are non-movable parts, and
a number of the plurality of magnetic materials in the particular direction is different from a number of repeated patterns of the plurality of windings of the first winding and a number of the magnet pairs
so that an alternating voltage having a frequency different from the frequency of the polyphase alternating voltage is induced in the second winding and the second winding outputs the alternating voltage.

8. The frequency converter according to claim 7 , wherein
the first winding, the magnet row, and the magnetic material row satisfy the following formula,
P=L±H

where
P: number of the plurality of magnetic materials in the particular direction,
L: number of repeated patterns of the plurality of windings of the first winding in the particular direction, and
H: number of the magnetic pole pairs of the magnet row in the particular direction.

9. The frequency converter according to any one of claim 7 , comprising
a cylindrical holding member holding the magnetic material row, wherein
the particular direction is a circumferential direction of the holding member and the first winding and the second winding are arranged in a manner such as to generate a periodic magnetic field along the circumferential direction.

10. The frequency converter according to claim 9 , wherein
the first winding and the second winding
are arranged in such a manner that a winding axis is directed to a center of the holding member.

11. The frequency converter according to any one of claim 7 , comprising
a disk-shaped holding member holding the magnetic material row, wherein
the particular direction is a circumferential direction of the holding member and the first winding and the second winding are arranged in a manner such as to generate a periodic magnetic field along the circumferential direction.

12. The frequency converter according to claim 11 , wherein
the first winding and the second winding
are arranged in such a manner that a winding axis is approximately perpendicular to the holding member.

13. The frequency converter according to claim 7 , wherein the plurality of windings of the second winding are arranged between the plurality of magnetic materials.

14. The frequency converter according to claim 7 , wherein the plurality of windings of the second winding are wound around each magnetic material.

Assignees

• Hitachi Metals Ltd

Inventors

• Mita Masahiro

Classifications

• H02M5/16

  for conversion of frequency · CPC title

• H02M5/38

  by combination of static with dynamic converters; by combination of dynamo-electric with other dynamic or static converters · CPC title

• H01F38/18 Primary

  Rotary transformers · CPC title

• H02M11/00 Primary

  Power conversion systems not covered by the preceding groups · CPC title