Electric apparatus with moving magnetic field generating apparatus

Patent metadata

Field	Value
Publication number	US-9613740-B2
Application number	US-201414535907-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	Sep 29, 2010
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A moving magnetic field generating apparatus includes a magnet array including magnets disposed at a first pitch such that N and S poles of adjacent magnets in the magnet array are alternated, and first and second magnetic pole piece arrays extending along the magnet array to interpose the magnet array therebetween with a gap from the magnet array. The first and second magnetic pole piece arrays are disposed with a predetermined phase difference therebetween. The first magnetic pole piece array includes first magnetic pole pieces disposed at a second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array. The second magnetic pole piece array is configured similarly to the first magnetic pole piece array. One of the first and second magnetic pole piece arrays and the magnet array is relatively moved to the other at a predetermined speed.

First claim

What is claimed is:

1. An electric apparatus comprising a moving magnetic field generating apparatus and a magnetic pole array including a plurality of coils disposed at a predetermined pitch to form a plurality of magnetic poles,
the moving magnetic field generating apparatus including:
a magnet array including a plurality of magnets disposed at a first pitch such that N and S poles of adjacent magnets in the magnet array are alternated; and
first and second magnetic pole piece arrays extending along the magnet array to interpose the magnet array therebetween with a gap from the magnet array, the first and second magnetic pole piece arrays being rotationally offset relative to one another so as to have a predetermined phase difference between each other,
the first magnetic pole piece array including a plurality of first magnetic pole pieces disposed at a second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array,
the second magnetic pole piece array including a plurality of second magnetic pole pieces disposed at the second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array, wherein: the first and second pitches and the phase difference are set such that, when one of the first and second magnetic pole piece arrays and the magnet array makes a relative movement with respect to the other at a predetermined relative moving speed, magnetic flux emanating from n consecutive magnets in the magnet array, where n is a natural number, forms synthesized magnetic flux that sequentially passes through the first magnetic pole pieces in the first magnetic pole piece array facing the n magnets and the second magnetic pole pieces in the second magnetic pole piece array facing the n magnets, thereby forming a high-speed moving magnetic field that moves at a speed faster than the predetermined relative moving speed; and

the coils in the magnetic pole array are disposed to face at least one of the first and second magnetic pole piece arrays of the moving magnetic field generating apparatus.

2. A magnetic encoder comprising a moving magnetic field generating apparatus and one or more Hall elements configured to produce an output allowing detection of a rotational angle,
the moving magnetic field generating apparatus including:
a magnet array including a plurality of magnets disposed at a first pitch such that N and S poles of adjacent magnets in the magnet array are alternated; and
first and second magnetic pole piece arrays extending along the magnet array to interpose the magnet array therebetween with a gap from the magnet array, the first and second magnetic pole piece arrays being rotationally offset relative to one another so as to have a predetermined phase difference between each other,
the first magnetic pole piece array including a plurality of first magnetic pole pieces disposed at a second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array,
the second magnetic pole piece array including a plurality of second magnetic pole pieces disposed at the second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array, wherein: the first and second pitches and the phase difference are set such that, when one of the first and second magnetic pole piece arrays and the magnet array makes a relative movement with respect to the other at a predetermined relative moving speed, magnetic flux emanating from n consecutive magnets in the magnet array, where n is a natural number, forms synthesized magnetic flux that sequentially passes through the first magnetic pole pieces in the first magnetic pole piece array facing the n magnets and the second magnetic pole pieces in the second magnetic pole piece array facing the n magnets, thereby forming a high-speed moving magnetic field that moves at a speed faster than the predetermined relative moving speed; and

the one or more Hall elements are disposed to face at least one of the first and second magnetic pole piece arrays of the moving magnetic field generating apparatus.

3. A counter-rotating motor comprising a moving magnetic field generating apparatus, a motor stator, and first and second rotary structures configured to be rotatable independently of each other relative to the motor stator, said motor stator being disposed inside the first and second rotary structures and including a plurality of excitation windings to generate a rotating magnetic field,
the moving magnetic field generating apparatus including:
a magnet array including a plurality of magnets disposed at a first pitch such that N and S poles of adjacent magnets in the magnet array are alternated; and
first and second magnetic pole piece arrays extending along the magnet array to interpose the magnet array therebetween with a gap from the magnet array, the first and second magnetic pole piece arrays being rotationally offset relative to one another so as to have a predetermined phase difference between each other,
the first magnetic pole piece array including a plurality of first magnetic pole pieces disposed at a second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array,
the second magnetic pole piece array including a plurality of second magnetic pole pieces disposed at the second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array, wherein:

the first and second pitches and the phase difference are set such that, when one of the first and second magnetic pole piece arrays and the magnet array makes a relative movement with respect to the other at a predetermined relative moving speed, magnetic flux emanating from n consecutive magnets in the magnet array, where n is a natural number, forms synthesized magnetic flux that sequentially passes through the first magnetic pole pieces in the first magnetic pole piece array facing the n magnets and the second magnetic pole pieces in the second magnetic pole piece array facing the n magnets, thereby forming a high-speed moving magnetic field that moves at a speed faster than the predetermined relative moving speed; and
the magnet array of the moving magnetic field generating apparatus is disposed in the first rotary structure and arranged outside the motor stator, and the first and second magnetic pole piece arrays of the moving magnetic field generating apparatus are disposed in the second rotary structure.

4. A counter-rotating fan comprising a moving magnetic field generating apparatus, a motor stator, and first and second rotary structures configured to be rotatable independently of each other relative to the motor stator, said motor stator being disposed inside the first and second rotary structures and including a plurality of excitation windings to generate a rotating magnetic field, a first impeller attached to the first rotary structure, and a second impeller attached to the second rotary structure,
the moving magnetic field generating apparatus including:
a magnet array including a plurality of magnets disposed at a first pitch such that N and S poles of adjacent magnets in the magnet array are alternated; and
first and second magnetic pole piece arrays extending along the magnet array to interpose the magnet array therebetween with a gap from the magnet array, the first and second magnetic pole piece arrays being rotationally offset relative to one another so as to have a predetermined phase difference between each other,
the first magnetic pole piece array including a plurality of first magnetic pole pieces disposed at a second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array,
the second magnetic p

Assignees

• Sanyo Electric Co

Inventors

• Sugita Satoshi
• Misawa Yasushi
• Tang Yuqi
• Miyairi Shigenori

Classifications

• H02K41/031

  of the permanent magnet type · CPC title

• F03D9/12 Primary

  storing kinetic energy, e.g. using flywheels · CPC title

• H02K49/102

  Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact (magnetized gearings with physical contact F16H13/12, F16H49/005) · CPC title

• H02K44/00 Primary

  Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa · CPC title

• H02K16/02

  Machines with one stator and two {or more} rotors · CPC title