Motor and blower

Patent metadata

Field	Value
Publication number	US-2016248283-A1
Application number	US-201615044882-A
Country	US
Kind code	A1
Filing date	Feb 16, 2016
Priority date	Feb 19, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

A motor includes a stator and a rotor. The stator includes an inner circumference stator section and an outer circumference stator section. The inner circumference stator section and the outer circumference stator section each include two stator cores and a coil. The two stator cores each include claw poles and are coupled to each other. The coil is arranged between the two stator cores. The rotor includes an inner circumference magnet and an outer circumference magnet. The inner circumference magnet, which is arranged at an inner circumferential side of the inner circumference stator section, opposes the claw poles in the radial direction. The outer circumference magnet, which is arranged at an outer circumferential side of the outer circumference stator section, opposes the claw poles in the radial direction. The inner circumference stator section and the inner circumference magnet form an inner circumference motor unit. The outer circumference stator section and the outer circumference magnet form an outer circumference motor unit.

First claim

1 . A motor comprising:
a stator including an inner circumference stator section and an outer circumference stator section, which is located at an outer circumferential side of the inner circumference stator section, wherein the inner circumference stator section and the outer circumference stator section each include
two stator cores each including a plurality of claw poles in a circumferential direction, wherein the stator cores are coupled to each other so that the claw poles of one of the stator cores and the claw poles of the other one of the stator cores are alternately arranged in the circumferential direction, and
a coil located between the two stator cores in an axial direction to cause the claw poles to function as magnetic poles; and
a rotor rotated by a rotating magnetic field generated at the stator, wherein the rotor includes
an inner circumference magnet located at an inner circumferential side of the inner circumference stator section and opposed to the claw poles in a radial direction, and
an outer circumference magnet located at an outer circumferential side of the outer circumference stator section and opposed to the claw poles in the radial direction, wherein
the inner circumference stator section and the inner circumference magnet configure an inner circumference motor unit, and the outer circumference stator section and the outer circumference magnet configure an outer circumference motor unit.

2 . The motor according to claim 1 , wherein
at least one of the inner circumference stator section and the outer circumference stator section includes a projection projecting in the axial direction from each of the claw poles, and the rotor includes an axial opposing magnet that opposes the projection in the axial direction.

3 . The motor according to claim 2 , wherein the coil of the inner circumference stator section and the coil of the outer circumference stator section are each supplied with drive current of a different phase.

4 . The motor according to claim 1 , wherein the inner circumference motor unit and the outer circumference motor unit are configured to have different phases.

5 . The motor according to claim 1 , wherein
the inner circumference motor unit is one of a plurality of inner circumference motor units arranged in the axial direction, and the outer circumference motor unit is one of a plurality of outer circumference motor units arranged in the axial direction.

6 . The motor according to claim 5 , wherein
the plurality of inner circumference motor units are configured to have different phases, and the plurality of outer circumference motor units are configured to have different phases.

7 . The motor according to claim 1 , comprising a ventilation passage extending between the inner circumference stator section and the outer circumference stator section, wherein the ventilation passage communicates a first axial side and a second axial side of the stator.

8 . The motor according to claim 7 , wherein
the inner circumference stator section and the outer circumference stator section are spaced apart by a gap in the radial direction, and the ventilation passage is configured by an outer circumference surface of the inner circumference stator section and an inner circumference surface of the outer circumference stator section that are opposed to each other and spaced apart from each other in the radial direction.

9 . The motor according to claim 8 , wherein at least one of the outer circumference surface of the inner circumference stator section and the inner circumference surface of the outer circumference stator section configuring the ventilation passage includes a large number of recesses and projections.

10 . A motor comprising:
a rotor including first and second rotor cores stacked in an axial direction, each including a plurality of claw poles arranged in a circumferential direction, and a permanent magnet located between the first rotor core and the second rotor core and magnetized in the axial direction; a stator including first and second stator cores stacked in the axial direction, each including a plurality of claw poles arranged in the circumferential direction, and a coil located between the first stator core and the second stator core and extended in the circumferential direction; and at least one of a rotor insulator and a stator insulator, wherein the rotor insulator is engaged with at least one of the claw poles of the first rotor core and at least one of the claw poles of the second rotor core in a manner restricting relative movement in the circumferential direction, and the stator insulator is engaged with at least one of the claw poles of the first stator core and at least one of the claw poles of the second stator core in a manner restricting relative movement in the circumferential direction.

11 . The motor according to claim 10 , wherein
the stator is configured by stacking in the axial direction a plurality of stator sections, each including the first stator core, the second stator core, the coil, and the stator insulator, and the stator insulators of adjacent ones of the stator sections in the axial direction are engaged with each other in a manner restricting relative movement in the circumferential direction.

12 . The motor according to claim 10 , wherein
the stator includes the stator insulator, the first stator core and the second stator core are spaced apart by a void, and the stator insulator projects toward the void from side surfaces of the first stator core and the second stator core opposing the void.

13 . The motor according to claim 10 , wherein
the stator includes the stator insulator, and the stator insulator includes a coil guide groove that receives an end portion of the coil.

14 . The motor according to claim 10 , wherein
the stator is configured by stacking in the axial direction a plurality of stator sections, each including the first stator core, the second stator core, the coil, and the stator insulator, the stator insulator of each of the stator sections includes at least one of a first axial projection and a second axial projection, the first axial projection projects further toward an outer side of the stator section than the first stator core in the axial direction, and the second axial projection projects further toward the outer side of the stator section than the second stator core in the axial direction.

15 . The motor according to claim 10 , wherein
the rotor includes the rotor insulator, the stator includes the stator insulator and opposes the rotor in the radial direction, and the rotor insulator and the stator insulator each include a slidable contact portion, wherein the slidable contact portions come into slidable contact with each other in the rotational direction between the first and second rotor cores opposed in the radial direction and the first and second stator cores opposed in the radial direction.

16 . The motor according to claim 10 , wherein
the rotor is configured by stacking in the axial direction a plurality of rotor sections, each including the first rotor core, the second rotor core, the permanent magnet, and the rotor insulator, and the rotor insulators of adjacent ones of the rotor sections in the axial direction are engaged with each other in a manner restricting relative movement in the circumferential direction.

17 . A blower comprising:
a motor including a rotor and a stator arranged opposing each other in a radial direction; and a fan configured to be rotatable integrally with the rotor, wh

Assignees

• Asmo Co Ltd

Inventors

• Takemoto Yoshiaki
• Kato Shigemasa
• Matsuda Masashi

Classifications

• F04D25/0606

  the electric motor being specially adapted for integration in the pump · CPC title

• H02K16/00

  Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} · CPC title

• F04D29/4226

  Fan casings · CPC title

• H02K29/00 Primary

  Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices · CPC title

• H02K1/2713

  the magnetisation axis of the magnets being axial, e.g. claw-pole type · CPC title