JP2009077515A - Claw pole type motor and pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a claw pole type motor capable of holding a control substrate for a motor while using a simple structure. <P>SOLUTION: In annular coil 52 housed inside an iron core 51, leg portions 52c upright on the surface of a coil bobbin 52a are provided so as to extend to the outside of the iron core 51, thereby holding the control substrate 6 by the leg portions 52c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a claw pole type motor and a pump using the motor as a drive source.

For example, a pump that sucks and discharges liquid is known that uses a claw pole type motor having claw magnetic poles as a motor that drives an impeller to rotate (see, for example, Patent Document 1). The claw pole type motor has an advantage that the structure is simple and the productivity is good and the manufacturing cost can be kept low.
Special table 2003-505648 gazette

  This type of motor has a control board for controlling the current flowing through the coil. However, in order to hold the control board, an additional member such as a housing is required, which complicates the structure. is there.

  The present invention has been made in view of such circumstances, and an object thereof is to hold a motor control board with a simple structure.

  In order to solve such a problem, the first invention includes a magnet that is arranged along the circumferential direction, a rotor that is rotatably supported, and an iron core that has claw magnetic poles arranged along the circumferential direction. Provided is a claw pole type motor having a stator housed in an annular coil so as to face the magnet through the claw magnetic poles and a control board for controlling a current flowing in the annular coil. The annular coil has an annular coil bobbin, an electric wire wound around the coil bobbin, and a plurality of legs arranged along the circumferential direction, and legs that stand from the surface of the coil bobbin and extend to the outside of the iron core. The control board is held by each of the legs.

  Here, in the first invention, the iron core is alternately arranged with the claw magnetic poles facing upward and the claw magnetic poles facing downward so that the directions of the tips of the claw magnetic poles are staggered, and in the same direction. It is preferable that a gap corresponding to the claw magnetic poles extending in the facing direction is formed between a pair of claw magnetic poles extending and adjacent to each other. In this case, it is desirable that the leg portion extends to the outside of the iron core through the gap.

  In the first invention, the leg portion is preferably provided with a pin at the top for connecting the electric wire and a circuit on the control board.

  Furthermore, in the first invention, it is desirable that the leg portion has a through space formed therein for guiding the electric wire toward the control board.

  The second invention provides a pump using the claw pole type motor described in the first invention as a drive source.

  According to the present invention, in the annular coil housed in the iron core, the leg portion is provided on the surface of the coil bobbin, and the control board can be held by extending the leg portion to the outside of the iron core. Conventionally, an additional member such as a housing is required to hold the control board. However, since this can be substituted by the leg portion, the member for holding the control board can be omitted.

(First embodiment)
FIG. 1 is a cross-sectional view showing a pump according to a first embodiment of the present invention. This pump is a pump having a claw pole type motor as a drive source, and is mainly composed of a pump case 1, a separation plate 2, an impeller 3, a rotor 4, a stator 5, and a control board 6. Yes.

  The pump case 1 and the separation plate 2 are coupled to each other, and these form a pair to form a pump chamber 7. A sealing member 8 is interposed in a joint portion between the pump case 1 and the separation plate 2 from the viewpoint of securing the water tightness of the pump chamber 7. In the pump chamber 7, the impeller 3 and the rotor 4 are rotatably accommodated in an integrated state. Around the rotor 4, a stator 5 is disposed on the outer side of the separation plate 2 so as to face the outer surface of the rotor 4. Further, this pump is entirely covered with the mold resin 9 except for the pump case 1. That is, the separation plate 2, the stator 5 and the control substrate 6 are covered with the mold resin 9.

  The pump case 1 forms a pump chamber 7 together with the separation plate 2, and includes a case body 11 that defines the pump chamber 7, an inlet 12, and a discharge port 13. The suction port 12 is opened at the center of the top surface of the case body 11 and functions as an opening for sucking liquid into the pump chamber 7. The discharge port 13 is provided on the side wall of the case body 11 and functions as an opening for discharging the liquid in the pump chamber 7.

  The separation plate 2 forms a pump chamber 7 together with the pump case 1. Further, the separation plate 2 has a function of separating the rotor 4 and the stator 5 in a watertight state (separating the pump portion and the motor portion).

  The impeller 3 is integrally attached to the rotor 4 and rotates together with the rotor 4. As the impeller 3 rotates, the impeller 3 sucks liquid from the suction port 12 into the pump chamber 7, applies centrifugal force to the sucked liquid, and discharges the liquid from the discharge port 13 to the outside of the pump.

  The rotor 4 is formed as a cylindrical body, and rotates the impeller 3. The rotor 4 includes a cylindrical rotor body 41 and a magnet 42 that is provided on the outer wall (outer peripheral side) of the rotor body 41 and forms a magnetic circuit (magnetic flux). The rotor body 41 rotates via a bearing portion 46 with respect to a fixed shaft 45 inserted and fitted into a shaft support portion 43 provided in the pump case 1 and a shaft support portion 44 provided in the separation plate 2. It is supported freely. The fixed shaft 45 is made non-rotatable by a pair of detent plates 47 attached to both ends thereof. A gap (clearance) is secured between the magnet 42 and the separation plate 2 so as not to contact when the rotor 4 rotates.

  FIG. 2 is a perspective view schematically showing the state of the stator 5 and the control board 6. The stator 5 is configured such that an annular coil 52 is accommodated in an annular iron core 51 disposed to face the outer peripheral side of the rotor 4. The stator 5 has a function of transmitting a magnetic field generated by the annular coil 52 by flowing current from a plurality of claw magnetic poles (claw poles) 53 provided in the iron core 51 to the rotor 4.

  The iron core 51 has a substantially U-shaped cross section in which the inner peripheral side facing the rotor 4 is opened, and a pair of cylindrical side walls that cover the outer peripheral side of the annular coil 52 and the annular coil 52 from above and below. And a bottom surface. Further, the iron core 51 has a plurality (eight in this embodiment) of claw magnetic poles 53 arranged at equal intervals along the inner peripheral side of the annular coil 52. The claw magnetic pole 53 is bent from the inner edge portion of the upper bottom surface and extends downward in the axial direction, and the lower claw is bent from the inner edge portion of the lower bottom surface and extends upward in the axial direction. And a magnetic pole 53. Here, the upper claw magnetic poles 53 and the lower claw magnetic poles 53 are alternately arranged in the circumferential direction. The iron core 51 has a gap corresponding to the tip of the claw magnetic pole 53 extending in the opposite direction between a pair of claw magnetic poles 53 extending in the same direction and adjacent to each other.

  The iron core 51 is composed of, for example, a dust core obtained by compression-molding iron powder with an insulating film together with a binder. Specifically, the iron powder is subjected to an insulation treatment such as a phosphoric acid film treatment, and a thermosetting resin such as an epoxy resin is applied to the mold. And after filling a metal mold | die with a powder and compressing, it shape | molds by taking out. In this embodiment, the iron core 51 is composed of an upper iron core 51a and a lower iron core 51b that are separable from each other in consideration of releasability from the mold. The upper iron core 51a is formed by integrating an upper bottom surface, an upper claw magnetic pole 53 extending from the bottom surface, and an upper cylindrical region of the side wall, and the lower iron core 51b is formed by a lower bottom surface. The lower claw magnetic pole 53 extending from the bottom surface and the lower cylindrical region of the side wall portion are integrated.

  FIG. 3 is a perspective view schematically showing the annular coil 52. The annular coil 52 is mainly composed of a coil bobbin 52a and an electric wire 52b wound around the coil bobbin 52a. The coil bobbin 52a is an annular member having a substantially U-shaped cross section, and on its surface (specifically, on a surface horizontal in the circumferential direction), a plurality of leg portions 52c for holding the control board 6 are provided. Is provided. The leg portions 52c are disposed at equal intervals along the circumferential direction so as to correspond to the gap formed between the pair of claw magnetic poles 53 extending in the same direction in the iron core 51, and the coil bobbin 52a. It stands up from above the surface and extends to the outside of the iron core 51.

  At the top of the leg portion 52 c, a convex portion 52 d is provided which is inserted into an opening formed in the control board 6 and performs positioning and holding with respect to the control board 6. This convex part 52d does not need to be provided corresponding to all the leg parts 52c, and may be provided selectively with respect to any leg part 52c.

  FIG. 4 is an enlarged schematic view showing the vicinity of the leg portion 52c. In order to connect the wound electric wire 52b and the control board 6 to the top of the leg portion 52c, a pin 52f for binding the end of the electric wire 52b is provided. Note that the pins 52f do not need to be provided corresponding to all the leg portions 52c, and in the present embodiment, the pins 52f are selectively provided with respect to the arbitrary leg portions 52c (for example, a convex portion 52d is formed). Any two of the non-legs 52c).

  The control board 6 is provided on the back surface of the separation plate 2, and receives a signal from a position detection sensor (not shown) that detects the rotational position of the rotor 4, and controls the current that flows through the annular coil 52. Thus, the control board 6 controls the magnetic field generated by the annular coil 52 according to the rotational position of the rotor 4.

  In the pump configured as described above, the magnetic field generated in the annular coil 52 is transmitted from the claw magnetic pole 53 to the magnet 42 so that the magnet 42 is attracted and repelled, so that it is provided integrally with the rotor 4. The impeller 3 rotates around the fixed shaft 45. As the impeller 3 rotates, a pump action is generated, and the liquid is sucked into the pump chamber 7 from the suction port 12 and is pressurized in the pump chamber 7. The pressurized liquid is pumped in the circumferential direction and discharged from the discharge port 13 to the outside of the pump.

  As described above, according to the present embodiment, in the annular coil 52 accommodated in the iron core 51, the leg portion 52c is provided on the surface of the coil bobbin 52a, and this is extended to the outside of the iron core 51. The substrate 6 can be held. Conventionally, an additional member such as a housing is required to hold the control board 6, but this can be substituted by the leg portion 52c, so the member for holding the control board can be omitted. .

  Further, in the claw pole type motor, it is necessary to perform commutation in accordance with the rotational position of the rotor 4. This commutation timing is sensed by a position detection sensor disposed on the control board 6. For this purpose, it is necessary to precisely attach the angle between the control board 6 and the stator 5. According to the present embodiment, by positioning the leg portion 52c between the claw magnetic poles of the iron core 51, the stator 5 and the control board 6 can be positioned with high accuracy.

  Moreover, according to this embodiment, since the pin 52f for tying the electric wire 52b is provided in the top part of the leg part 52c, the process of the edge part of the electric wire 52b can be performed easily.

(Second Embodiment)
FIG. 5 is a schematic diagram illustrating a cross-sectional state of the leg portion 52c according to the second embodiment. The pump according to the second embodiment is different from that of the first embodiment in the structure of the annular coil 52. In addition, about the structure which is common in 1st Embodiment, a code | symbol is quoted, the overlapping description is abbreviate | omitted, and it demonstrates focusing on difference below.

  Specifically, a leg 52c provided on the surface of the coil bobbin 52a is formed with a space (penetrating space) 52g penetrating therethrough. The through space 52g allows the end of the electric wire 52b to be guided to the control board 6 through the inside of the leg portion 52c. Moreover, since the electric wire 52b can be insulated by passing the inside of the leg part 52c and guide | inducing it to the control board 6, safety | security can be ensured.

(Third embodiment)
FIG. 6 is a cross-sectional view showing a pump according to the third embodiment. This pump is a pump having a claw pole type motor as a drive source, and is mainly composed of a pump case 101, a separation plate 102, an impeller 103, a rotor 104, a stator 105, and a control board 106. Yes.

  The pump case 101 and the separation plate 102 are coupled to each other, and form a pump chamber 107 as a pair. In the pump chamber 107, the impeller 103 and the rotor 104 are rotatably accommodated in an integrated state. Inside the rotor 104, the stator 5 is disposed so as to face the separation plate 2, so that a motor configuration of a so-called outer type rotor structure is formed.

  The pump case 101 forms a pump chamber 107 together with the separation plate 102, and includes a case main body 111 that defines the pump chamber 107, a suction port 112, and a discharge port (not shown). The suction port 112 is opened at the center of the top surface of the case main body 111 and functions as an opening for sucking liquid into the pump chamber 107. The discharge port is provided on the side wall of the case body 111 and functions as an opening for discharging the liquid in the pump chamber 107.

  The separation plate 102 forms a pump chamber 107 together with the pump case 101. Further, the separation plate 102 has a function of separating the rotor 104 and the stator 105 into a watertight state (separating the pump portion and the motor portion).

  The impeller 103 is integrally attached to the rotor 104 and rotates together with the rotor 104. When the impeller 103 rotates, the impeller 103 sucks liquid from the suction port 112 into the pump chamber 107, applies centrifugal force to the sucked liquid, and discharges the liquid from the discharge port to the outside of the pump.

  The rotor 104 is formed as a cylindrical body, and rotates the impeller 3. The rotor 4 includes a cylindrical rotor main body 141 and a magnet 142 provided on the inner wall (inner peripheral side) of the rotor main body 141 and constituting a magnetic circuit (magnetic flux). The rotor main body 141 is rotatably supported via a bearing portion 146 with respect to a fixed shaft 145 disposed in the pump case 101. A gap (clearance) is secured between the magnet 142 and the separation plate 102 so as not to contact when the rotor 104 rotates.

  The stator 105 is configured such that an annular coil 152 is accommodated in an annular iron core 151 disposed to face the inner peripheral side of the rotor 104. The stator 105 has a function of transmitting a magnetic field generated by the annular coil 152 by flowing an electric current from a plurality of claw magnetic poles (claw poles) 153 included in the iron core 151 to the rotor 104.

  The iron core 151 has a substantially U-shaped cross section that is open on the outer peripheral side facing the rotor 104, and has a pair of cylindrical side walls covering the inner peripheral side of the annular coil 52 and a pair of sandwiching the annular coil 52 from above and below. And a bottom surface. The iron core 151 has a plurality of (eight in the present embodiment) claw magnetic poles 153 arranged at equal intervals along the outer peripheral side of the annular coil 152. The claw magnetic pole 153 includes an upper claw magnetic pole 53 bent from the inner edge of the upper bottom surface and extending downward in the axial direction, and a lower claw bent from the inner edge of the lower bottom surface and extended upward in the axial direction. And magnetic poles 153. Here, the upper claw magnetic poles 153 and the lower claw magnetic poles 153 are alternately arranged in the circumferential direction. In the iron core 151, a gap corresponding to the claw magnetic poles 153 extending in the opposite direction is formed between a pair of claw magnetic poles 153 extending in the same direction and adjacent to each other.

  The annular coil 152 is mainly composed of a coil bobbin 152a and an electric wire 152b wound around the coil bobbin 152a. The coil bobbin 152a is an annular member having a substantially U-shaped cross section, and a plurality of legs 152c for holding the control board 106 are provided on the surface (specifically, a surface horizontal in the circumferential direction). ing. The leg portions 152c correspond to the gaps in the iron core 151, are arranged at equal intervals along the circumferential direction, and stand up from the surface of the coil bobbin 152a and extend to the outside of the iron core 151.

  At the top of the leg portion 152c, a convex portion 152d is provided that is inserted into an opening formed in the control board 106 and performs positioning and holding with respect to the control board 106. This convex part 152d does not need to be provided corresponding to all the leg parts 52c, and is provided selectively with respect to the arbitrary leg part 52c in this embodiment.

  The control board 106 is provided on the back surface of the separation plate 102 and receives a signal from a position detection sensor (not shown) that detects the rotational position of the rotor 104 and controls the current that flows through the annular coil 152. Thus, the control board 106 controls the magnetic field generated by the annular coil 152 according to the rotational position of the rotor 104.

  In the pump configured as described above, the magnetic field generated in the annular coil 152 is transmitted from the claw magnetic pole 153 to the magnet 142, so that the magnet 142 is attracted and repelled, so that it is integrated with the rotor 104. The impeller 103 rotates about the fixed shaft 145. A pump action is generated as the impeller 103 rotates, and the liquid is sucked into the pump chamber 107 through the suction port 112 and pressurized in the pump chamber 107. The pressurized liquid is pumped in the circumferential direction and discharged from the discharge port to the outside of the pump.

  As described above, according to this embodiment, in the motor configuration of the outer rotor structure, the leg coil 152 is provided on the surface of the coil bobbin 152 a in the annular coil 152 housed in the iron core 151, and this is connected to the outside of the iron core 151. The control board 106 can be held by extending to the right. Thereby, the effect similar to 1st Embodiment can be acquired.

  Here, in this embodiment, although not particularly shown, in order to connect the wound electric wire 152b and the circuit on the control board 106 to the top of the leg 152c, as in the first embodiment. A pin for binding the end of the electric wire 152b may be provided. Moreover, as shown in 2nd Embodiment, the leg part 152c may form a penetration space in the inside, and may guide the electric wire 152b to the control board 6 using this penetration space.

  In addition, in each embodiment mentioned above, although the form which comprises the iron core 51 with a powder iron core was illustrated, this invention is not limited to this. The iron core 51 may be made by injection molding of a magnetic material obtained by mixing iron powder with an insulating film and a binder. In this case, a magnetic material in which iron powder whose surface has been subjected to insulation treatment such as phosphoric acid film treatment and a thermoplastic resin such as nylon can be used. In addition, when the iron core 51 is comprised with a powder iron core, compared with the case where an electromagnetic soft iron material is used, loss can be made small and the higher output motor can be comprised with the same volume. It is advantageous. On the other hand, in the case of injection molding, it is advantageous in that the manufacturing cost can be reduced as compared with the case of using another material (for example, a dust core).

  Moreover, although this embodiment illustrated about the pump which uses a claw pole type motor as a drive source, not only this pump but the claw pole type motor itself functions as a part of this invention.

Sectional drawing which shows the pump concerning 1st Embodiment The perspective view which shows typically the state of the stator 5 and the control board 6 A perspective view schematically showing the annular coil 52 Schematic diagram showing the vicinity of the leg 52c The schematic diagram which shows the cross-sectional state of the leg part 52c concerning 2nd Embodiment. Sectional drawing which shows the pump concerning 3rd Embodiment

Explanation of symbols

1 (101) Pump case 2 (102) Separator plate 3 (103) Impeller 4 (104) Rotor 5 (105) Stator 6 (106) Control board 7 (107) Pump chamber 8 Seal member 9 Mold resin 11 (111) Case body 12 (112) Suction port 13 Discharge port 41 (141) Rotor body 42 (142) Magnet 43 Shaft support portion 44 Shaft support portion 45 (145) Fixed shaft 46 (146) Bearing portion 47 Anti-rotation plate 51 (151) Iron core 51a Upper iron core 51b Lower iron core 52 (152) Ring coil 52a (152a) Coil bobbin 52b (152b) Electric wire 52c (152c) Leg 52d (152d) Protrusion 52f Pin 52g Through space 53 (153) Claw magnetic pole

Claims (5)

In claw pole type motor,
A rotor that is provided along a circumferential direction and that is rotatably supported;
A stator housed in an annular coil inside the iron core having claw magnetic poles arranged along the circumferential direction so as to face the magnet via the claw magnetic poles,
A control board for controlling the current flowing through the annular coil,
The annular coil is
An annular coil bobbin;
An electric wire wound around the coil bobbin;
A plurality of legs arranged along the circumferential direction, and having legs that stand up from the surface of the coil bobbin and extend to the outside of the iron core;
The claw pole motor, wherein the control board is held by each of the legs. In the iron core, upward claw magnetic poles and downward claw magnetic poles are alternately arranged in the circumferential direction so that the directions of the tips of the claw magnetic poles are staggered, and a pair of adjacent ones extending in the same direction. Between the claw magnetic poles, a gap corresponding to the claw magnetic poles extending in the opposite direction is formed,
The claw pole type motor according to claim 1, wherein the leg portion extends to the outside of the iron core through the gap.   3. The pin according to claim 1, wherein the leg is provided with a pin on the top for connecting the electric wire and a circuit on the control board. The claw pole type motor described.   The claw pole motor according to any one of claims 1 to 3, wherein the leg portion has a through space formed therein for guiding the electric wire toward the control board.   The pump which uses the said claw pole type motor as described in any one of Claim 1 to 4 as a drive source.

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