JP2009201287A - Claw pole type motor and pump with the motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a claw pole type motor that is miniaturized without increasing the number of components and a cost, and to provide a pump with the motor. <P>SOLUTION: The claw pole type motor 1 includes: a rotor 7 formed in substantially cylindrical shape, rotatably supported and having a magnet; and a stator 17 having pole teeth 37, 41 extending in an axial direction and transmitting a rotating drive force to the rotor 7, wherein the rotor 7 and the stator 17 are each disposed in the axial direction and the pole teeth 37, 41 of the stator 17 are housed and disposed in the recess of the rotor 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a claw pole type motor and a pump including the claw pole type motor.

  For example, a pump that sucks and discharges a liquid is known that uses a claw pole type motor having claw magnetic poles as a motor that rotationally drives an impeller. This claw pole type motor has the advantage that the structure is simple and the productivity is good and the manufacturing cost can be kept low (for example, see Patent Document 1). A claw pole type motor described in Patent Document 1 includes a rotor having a cylindrical magnet composed of magnetized segments magnetized at a predetermined pitch along a circumferential direction, and the magnetized segments on an inner peripheral side and an outer peripheral side. And a stator having pole teeth magnetized to different poles from the magnetized segments.

The pump equipped with the claw pole type motor is paired with an impeller that sucks and discharges liquid, a pump case having an inlet and an outlet, and a pump chamber that rotatably accommodates the impeller. And a rotor having a magnet for rotationally driving the impeller, and a stator having claw magnetic poles and transmitting a rotational driving force to the rotor, and separating the rotor and stator by the separation plate. ing.
JP 2000-253644 A

  By the way, according to the background art, since the rotor is sandwiched from both sides, two annular coils as windings are required, and there is a problem that it is difficult to miniaturize the motor. In addition, there is a problem that the number of parts increases and the cost increases.

  Therefore, an object of the present invention is to provide a claw pole type motor that can be miniaturized without increasing the number of parts and cost, and a pump including the same.

  In order to solve the above problems, a claw pole type motor according to the present invention is formed in a substantially cylindrical shape and is rotatably supported, and has a rotor having a magnet and pole teeth extending along the axial direction. And a stator for transmitting a rotational driving force to the rotor, the rotor and the stator are respectively arranged in the axial direction, and the pole teeth of the stator are housed in the recesses of the rotor.

  The pump according to the present invention uses the claw pole type motor as a drive source.

  According to the claw pole type motor according to the present invention, since the pole teeth of the stator are housed and disposed in the recesses of the rotor, the diameter can be reduced without increasing the number of parts and the cost. Therefore, the pump provided with the claw pole type motor can be reduced in size by downsizing the claw pole type motor.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a cross-sectional view illustrating a claw pole type motor according to a first embodiment of the present invention.

  The claw pole type motor 1 includes an outer frame 3, a rotor 7 housed inside the frame 3 and rotatably supported on the frame 3 via a rotation shaft 27, and the rotor 7 and a stator 17 that transmits a rotational driving force to the rotor 7.

  The frame 3 includes a disc-shaped side surface portion 11 disposed on the right side of the paper surface of FIG. 1, a disk-shaped bottom surface portion 13 disposed on the left side of the paper surface, and the side surface portion 11 and the bottom surface portions 13. Are integrally formed with a cylindrical cylindrical portion 15 that connects the left and right.

  A mounting plate 23 is disposed inside the frame 3, and the control board 9 is attached to the left side of the mounting plate 23 via a support member 21. A stator 17 is attached to the right side of the mounting plate 23.

  A bearing 29 is disposed at the center of the side surface portion 11 and the bottom surface portion 13 of the frame 3, and a rotating shaft 27 is rotatably supported by the bearing 29. An annular coil 25 that is a plurality of windings is wound around the stator 17 along the circumferential direction.

  2 is a perspective view showing an iron core constituting the stator of FIG. 1, FIG. 3 is a perspective view showing a first divided body constituting the iron core of FIG. 2, and FIG. 4 is a second division constituting the iron core of FIG. It is a perspective view which shows a body.

  As shown in FIG. 2, the iron core 18 of the stator 17 according to the present embodiment is formed in a substantially cylindrical shape and includes a first divided body 31 and a second divided body 33.

  The first divided body 31 includes a first divided body side magnetic pole 39 disposed on the lower side, a top portion 35 formed at the upper end of the first divided body side magnetic pole 39 and extending to the inner peripheral side, The first divided body side pole teeth 37 extending upward (in the axial direction) from the inner peripheral end are integrally formed. The first divided body side pole teeth 37 are disposed at four equal intervals along the circumferential direction.

  Further, the second divided body 33 is inserted and assembled upward from the lower side of the first divided body 31, whereby the iron core 18 shown in FIG. 2 is configured. Specifically, a donut-shaped bottom surface 43 disposed at the lower end, a lower wall portion 45 extending upward from the inner peripheral end of the bottom surface 43, and an upper side from the upper end of the lower wall 45 Are integrally formed with the second divided body side pole teeth 41 extending from the side. The second divided body side pole teeth 41 are arranged at four locations at equal intervals along the circumferential direction.

  The iron core 18 of the stator 17 shown in FIG. 2 is configured by combining the first divided body 31 and the second divided body 33 close to each other in the axial direction. A stator 17 is formed by winding an annular coil 25 (not shown) around the iron core 18.

  The iron core 18 is made of a compacted iron core formed by filling a magnetic cavity in a mold cavity and compressing it. The dust core has a structure in which the surface of each iron powder is coated with an inorganic insulating film and the particles are bound with a resin. The iron loss at high frequencies is low (eddy current loss is low) and saturated. It has the advantage of high magnetic flux density and excellent heat resistance.

  5 is a perspective view showing the rotor of FIG. 1, and FIG. 6 is a cross-sectional view taken along line AA of FIG.

  The rotor 7 is integrally formed with a small-diameter cylindrical portion 51 disposed at the center in the radial direction and a large-diameter cylindrical portion 53 that is formed larger in diameter than the small-diameter cylindrical portion 51 and disposed on the outer peripheral side of the small-diameter cylindrical portion 51. It has been done. Both the small-diameter cylindrical portion 51 and the large-diameter cylindrical portion 53 are formed in a cylindrical shape, and a magnet (not shown) is provided. This magnet has polar anisotropy. Further, a shaft insertion hole 55 is formed through the inside of the small diameter cylindrical portion 51, and the rotary shaft 27 is inserted through the shaft insertion hole 55 and attached thereto. The first divided body side pole teeth 37 and the second divided body side pole teeth 41 of the stator 17 described above are accommodated and disposed in a recess 52 formed between the small diameter cylindrical portion 51 and the large diameter cylindrical portion 53. .

  FIG. 7 is a cross-sectional view illustrating the rotor assembly according to the first embodiment of the present invention.

  The rotor assembly 57 includes the rotor 7 shown in FIG. 6 and the rotating shaft 27 that is inserted into and fixed to the shaft insertion hole 55 of the rotor 7.

  Next, operational effects according to the embodiment of the present invention will be described.

  The rotor 7 according to the first embodiment of the present invention is integrally formed with a bonded magnet. The bond magnet is a general term for permanent magnets formed by mixing a magnet powder such as a ferrite magnet with a crushed magnet powder and a binder such as epoxy or nylon. It is also called rubber magnet, PVC magnet, plastic magnet, etc. In the present embodiment, the small-diameter cylindrical portion 51 and the large-diameter cylindrical portion 53 are integrally formed with a compression-bonded bonded magnet or a thermoplastic bonded magnet, so that the cost of the rotor 7 can be reduced and the cost can be reduced. Can be planned.

  Further, in this embodiment, the rotor assembly 57 is formed by integrally forming the rotor 7 with the rotary shaft 27. Therefore, it is not necessary to adjust the rotational balance of the rotor 7, and the assembly of the rotor 7 is facilitated. .

  Since the magnet of the rotor 7 has polar anisotropy, a back yoke is unnecessary, and the claw pole type motor 1 with high output efficiency can be obtained.

  In the claw pole type motor 1 of this embodiment, a stator 17 having a dust core formed by filling and compressing magnetic powder in a cavity of a mold is used. The compacted iron core has a structure in which the surface of each iron powder is coated with an inorganic insulating film and the particles are bound with resin. The iron loss at high frequency is low (eddy current loss is low), and the saturation magnetic flux It has the advantage of high density and excellent heat resistance.

  As described above, in the claw pole type motor 1 of the first embodiment, since the stator 17 is composed of a dust core, it is several hundred kHz that cannot be satisfied by the electromagnetic steel sheet and ferrite that have been used for the stator so far. In addition to being able to be used in a high frequency range, it is further downsized with the same performance as before.

[Second Embodiment]
Next, a pump according to a second embodiment of the present invention will be described. However, the same structural parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 8 is a perspective view showing a pump according to the second embodiment of the present invention, and FIG. 9 is a sectional view taken along line BB of FIG.

  The outer surface of the pump 59 is covered with a casing 69 and a mold resin 77, and a cylindrical suction port 63 projects from a central portion of the substantially disc-shaped casing 69 in the radial direction. Further, a cylindrical discharge port 65 for discharging the liquid flowing into the pump 59 from the suction port 63 extends upward in the casing 69. Further, an impeller 87 rotatably supported by a centrifugal force is provided to the liquid flowing into the pump 59 from the suction port 63 and led to the discharge port 65. Since the impeller 87 is fixed to the rotor 7 and the bearing 29 which will be described later, the impeller 87 can rotate around the rotation shaft 27.

  The pump 59 incorporates the claw pole type motor 1 according to the first embodiment described above. As described in detail in the first embodiment, the claw pole type motor 1 is formed in a substantially cylindrical shape and is rotatably supported, and includes a rotor 7 having a magnet (not shown) and pole teeth 37 and 41. A stator 17 is provided that is housed in the recess 52 of the rotor 7 and applies a rotational driving force to the rotor 7.

  And between the rotor 7 and the stator 17, the separating plate 71 which isolate | separates both is arrange | positioned. Specifically, the outer peripheral edge 75 of the separation plate 71 is attached in contact with the outer peripheral edge of the casing 69. A shaft gripping portion 73 that protrudes toward the suction port 63 is formed at the center in the radial direction, and the rotating shaft 27 is fixed to the shaft gripping portion 73. And the part which covers the outer periphery of the pole teeth 37 and 41 of the stator 17 among the separating plates 71 is the upper wall part 79 arrange | positioned above the stator 17, and the side wall part 81 which covers the side of the pole teeth 37 and 41, and The lower wall portion 83 covers the lower sides of the pole teeth 37 and 41.

  Further, the control board 9 is provided on the back side of the stator 17 and the rotor 7 and controls a magnetic field generated by the annular coil 25 in response to a signal from a position detection unit (not shown). The stator 17, the control board 9, and the separation plate 71 are covered with a mold resin 77 made of, for example, unsaturated polyester.

  The liquid sucked and discharged by the impeller 87 is, for example, warm water of about 80 ° C. A bearing plate 67 is provided on the side of the bearing 29.

  The flow of the liquid in the pump 59 having the above configuration will be briefly described.

  First, the magnetic field generated by energizing the annular coil 25 is transmitted from the iron core 18 to the magnet of the rotor 7 so that the magnet attracts and repels, so that the impeller 87 provided integrally with the rotor 7 It rotates about the rotating shaft 27. Then, a pump operating force is generated with the rotation of the impeller 87, and the liquid is sucked into the pump chamber from the suction port 63. The liquid pressurized in the pump chamber and pumped in the outer peripheral direction is discharged from the discharge port 65. It is discharged out of the pump.

  Next, operational effects according to the embodiment of the present invention will be described.

  In the pump 59 of this embodiment, since the entire stator 17 is covered with the mold resin 77, the stator 17 can be protected by the mold resin 77 and the strength can be increased. Further, since the entire separation plate 71 is also covered with the mold resin 77, the contact area between the separation plate 71 and the mold resin 77 is increased, so that the heat of the motor 1 and the heat of the liquid transmitted through the separation plate 71 are further increased. Since the heat can be further dissipated, further motor efficiency can be increased.

[Third Embodiment]
Next, a pump 89 according to a third embodiment of the present invention will be described. However, the same structural parts as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 10 is a sectional view showing a pump according to a third embodiment of the present invention.

  This pump 89 is different from the pump 59 of the second embodiment shown in FIG. 9 in the structure of the separation plate.

  That is, in this embodiment, since the iron core 18 (including the pole teeth 37 and 41) constituting the stator 17 is made of magnetic stainless steel, the iron core 18 is hardly corroded by moisture. Therefore, the upper wall part 79, the side wall part 81, and the lower wall part 83 (refer FIG. 9) used as the part which covers the outer peripheral side of the pole teeth 37 and 41 among the separating plates 85 are abolished.

  The other structure is the same as FIG. 9 which shows the pump which concerns on 2nd Embodiment mentioned above.

  Next, operational effects according to the embodiment of the present invention will be described.

  In the present embodiment, since the iron core 18 constituting the stator 17 is made of magnetic stainless steel, the iron core 18 is hardly corroded by moisture, and the part of the separating plate 85 that covers the outer peripheral side of the pole teeth 37 and 41; The upper wall portion 79, the side wall portion 81, and the lower wall portion 83 (see FIG. 9) are eliminated.

  Accordingly, the distance between the large-diameter cylindrical portion 53 and the small-diameter cylindrical portion 51 of the rotor 7 can be reduced by the thickness of the upper wall portion 79 and the lower wall portion 83 of the separation plate 85.

  In summary, by forming the iron core 18 from magnetic stainless steel, the size of the claw pole motor 1 and the pump 89 in the radial direction can be reduced by twice the thickness of the separation plate 85. In addition, the pump 89 can be downsized.

  Note that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, in the said 1st Embodiment and 2nd Embodiment, although the iron core 18 of the stator 17 was comprised with the dust core, besides this dust core, it formed with metal glass, or comprised with magnetic stainless steel, It may be formed by injection molding using resin binding.

  Metallic glass is a stable amorphous material like oxide glass and is a metal that easily deforms even at high temperatures. Unlike conventional amorphous, it is a material that is vitrified and hardly crystallized even at a relatively slow cooling rate. The iron core formed of the metal glass can suppress the eddy current loss more than the case of the dust core, and can obtain the effect that the output efficiency and the output torque of the motor are improved.

  Further, by configuring the iron core of the stator 17 with magnetic stainless steel, as described in the third embodiment, a part of the stator 17 can be eliminated from the separation plate 85 disposed in the pump 89. . By eliminating a part of the separation plate 85, the diameter of the motor 1 and the pump 89 can be reduced by twice the thickness of the separation plate 85.

  Furthermore, you may produce the said iron core by injection molding using the magnetic material which mixed the iron powder and resin binding with which insulation coating was carried out. In this case, the eddy current loss is suppressed more than in the case of the dust core, and the manufacturing cost can be suppressed at a low cost. In addition, as an example of resin binding, nylon and PPS (polyphenylene sulfide) are preferable. This PPS is classified as a high heat-resistant super engineering plastic, is not eroded by most acids, alkalis and organic solvents, and is excellent in strength, elastic modulus and fatigue characteristics.

It is sectional drawing which shows the claw pole type motor by 1st Embodiment of this invention. It is a perspective view which shows the iron core which comprises the stator of FIG. It is a perspective view which shows the 1st division body which comprises the iron core of FIG. It is a perspective view which shows the 2nd division body which comprises the iron core of FIG. It is a perspective view which shows the rotor of FIG. It is sectional drawing by the AA line of FIG. 1 is a cross-sectional view showing a rotor assembly according to a first embodiment of the present invention. It is a perspective view which shows the pump by 2nd Embodiment of this invention. It is sectional drawing by the BB line of FIG. It is sectional drawing which shows the pump by 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Claw pole type motor 3 ... Frame 7 ... Rotor 9 ... Control board 11 ... Side surface part 13 ... Bottom face part 15 ... Cylindrical part 17 ... Stator 18 ... Iron core 21 ... Support member 23 ... Mounting plate 25 ... Ring coil 27 ... Rotating shaft DESCRIPTION OF SYMBOLS 29 ... Bearing 31 ... 1st division body 33 ... 2nd division body 35 ... Top part 37, 41 ... Pole tooth 39 ... 1st division body side magnetic pole 43 ... Bottom 45 ... Lower wall part 51 ... Small diameter cylindrical part 52 ... Concave part 53 ... Large Diameter cylindrical part 55 ... Shaft insertion hole 57 ... Rotor assembly 59, 89 ... Pump 63 ... Suction port 65 ... Discharge port 67 ... Bearing plate 69 ... Casing 71, 85 ... Separation plate 73 ... Shaft gripping part 75 ... Outer peripheral edge 77 ... Mold resin 79 ... Upper wall portion 81 ... Side wall portion 83 ... Lower wall portion 87 ... Impeller

Claims (12)

A rotor having a magnet formed in a substantially cylindrical shape and rotatably supported;
A pole tooth extending along the axial direction, and a stator for transmitting a rotational driving force to the rotor,
A claw pole type motor in which the rotor and the stator are respectively arranged in the axial direction, and the pole teeth of the stator are housed in the recesses of the rotor.   The claw pole type motor according to claim 1, wherein the rotor is integrally formed with a bonded magnet.   3. The claw pole type motor according to claim 1, wherein the rotor is integrally formed with a rotating shaft, and the rotating shaft is rotatably supported by a frame.   The claw pole type motor according to any one of claims 1 to 3, wherein the magnet of the rotor has polar anisotropy.   The claw pole motor according to any one of claims 1 to 3, wherein the magnet of the rotor is radially magnetized.   The claw pole motor according to any one of claims 1 to 5, wherein the stator iron core is formed of a dust core formed by compressing magnetic powder.   The claw pole motor according to any one of claims 1 to 5, wherein an iron core of the stator is made of metal glass.   The claw pole motor according to any one of claims 1 to 5, wherein an iron core of the stator is made of magnetic stainless steel.   The claw pole type motor according to any one of claims 1 to 5, wherein the iron core of the stator is manufactured by injection molding using a resin binder.   The claw pole motor according to any one of claims 1 to 9, wherein the stator and a control board for controlling a magnetic field generated by the stator are covered with a mold resin.   A pump comprising the claw pole type motor according to any one of claims 1 to 10. An impeller that is rotatably supported and applies a centrifugal force to the liquid flowing in from the suction port to be discharged from the discharge port;
A rotor having a small-diameter cylindrical portion disposed in the center in the radial direction and a large-diameter cylindrical portion that is formed larger in diameter than the small-diameter cylindrical portion and disposed on the outer peripheral side of the small-diameter cylindrical portion, and that rotates the impeller When,
A stator having pole teeth extending along the axial direction and transmitting a rotational driving force to the rotor;
A separation plate disposed between the rotor and the stator,
The rotor and the stator are respectively disposed in the axial direction, and the pole teeth of the stator are housed and disposed in a recess formed between the large diameter cylindrical portion and the small diameter cylindrical portion of the rotor,
The pump is characterized in that the pole teeth of the stator are made of magnetic stainless steel, thereby eliminating the portion of the separating plate that is disposed in the recess of the rotor.

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