JP2010279172A - Motor, stator manufacturing method, and fan - Google Patents

Abstract

An object of the present invention is to provide a thin motor capable of firmly fixing a terminal pin to a stator while easily tying a conductor wire end to a terminal pin and preventing disconnection of the conductor.
A rotor 2 that rotates about a central axis and a stator 3 that rotatably supports the rotor 2 via a bearing portion 41 are provided, and the stator 3 extends radially outward from the central axis. It has a stator core 31 having a plurality of teeth 36, a plurality of terminal pins 32 extending radially outward from the central axis, and an insulating support portion 33 that supports the plurality of terminal pins 32. Insulating films 35 are formed on both surfaces of the teeth 36, and the terminal pins 32 are sandwiched between the teeth 36 and the support portions 32 so that the insulating film 35 is interposed between the teeth 36 and the terminal pins 32. A coil 34 is formed by winding a conductive wire around the support portion 32. The end 34a of the conducting wire is electrically connected to the terminal pin 32.
[Selection] Figure 1

Description

  The present invention relates to a motor, a method of manufacturing a stator used in the motor, and a fan including the motor.

  A motor for driving a centrifugal fan or an axial fan used for cooling an electronic device or the like includes a rotor that rotates around a central axis and a stator that rotatably supports the rotor via a bearing portion. The stator includes a stator core having a plurality of teeth and a coil formed by winding a conductive wire around the teeth. And the drive current is provided to a stator by the end part of the conducting wire wound around the teeth being electrically connected to the circuit board.

  As a method of electrically connecting the end of the conductive wire wound around the tooth to the circuit board, it is common to solder the end of the conductive wire directly to the land portion on the circuit board. Since the soldering work is performed manually by the operator, the soldering process is difficult and the risk of disconnection is high in the work.

  Therefore, Japanese Patent Laid-Open No. 6-253482 discloses that a terminal pin is inserted and fixed in an axial direction in an insulator mounted on a stator core, and an end portion of the coil is connected to one end portion of the terminal pin. A technique is described in which the other end is inserted into a hole of a circuit board and soldered. By such a method, the soldering process is facilitated and disconnection defects can be reduced.

  Furthermore, when the motor is made thinner, the following problems arise. That is, in order to reduce the thickness of the motor, it is necessary to reduce the space between the stator and the circuit board. However, if the space is reduced, it becomes difficult to insert the terminal pins into the insulator in the axial direction. Further, since the axial length of the stator is shortened, it is difficult to firmly fix the terminal pins.

  Japanese Patent Application Laid-Open No. 2000-320496 describes a technique for reducing the thickness of the motor by eliminating the stator core and forming a so-called coreless type motor structure. Since the coreless type motor literally has no stator core for collecting magnetic flux, it cannot efficiently convert magnetic flux into rotational force.

In view of this, the present applicant disclosed in Japanese Patent Application Laid-Open No. 2007-49891 a technique in which the end portion of a coil is easily entangled with a terminal pin and the stator is thinned while preventing breakage of the conductor. ing.
JP-A-6-253482 JP 2000-320496 A JP 2007-49891 A

  The technique disclosed by the present applicant in Japanese Patent Application Laid-Open No. 2007-49891 is excellent in that the end portion of the coil can be easily entangled with the terminal pin, but the bearing housing in which the terminal pin is a guide portion. Since it is necessary to move along the outer peripheral surface, the bearing housing becomes long. Therefore, in order to reduce the thickness of the motor, it is necessary to further reduce the thickness of the bearing housing.

  An object of the present invention is to provide a thin motor that can easily entangle a conductive wire end portion of a coil to a terminal pin and fix the terminal pin to a stator while preventing disconnection of the conductive wire.

  A motor according to one aspect of the present invention includes a rotor that rotates about a central axis, and a stator that rotatably supports the rotor via a bearing portion, and the stator extends radially outward from the central axis. A stator core having a plurality of teeth, a plurality of terminal pins extending radially outward from the central axis, and an insulating support for supporting the plurality of terminal pins, and insulating on both surfaces of the plurality of teeth A film is formed, and a plurality of terminal pins are sandwiched between a tooth and a support portion so that an insulating film is interposed between the teeth and the terminal pin, and a coil is wound around the teeth and the support portion together with a conductive wire. It is formed, and the end portion of the conducting wire is electrically connected to the terminal pin.

  With such a configuration, the motor can be reduced in thickness, and the end of the coil can be easily entangled with the terminal pin, and the terminal pin can be fixed to the stator while preventing disconnection of the conductor. Moreover, in the case of the system which provides a terminal pin, a conducting wire end part is fixed to a terminal pin before soldering operation. Next, the terminal pins are soldered to the land portions on the circuit board. Therefore, it is possible to prevent the windings from being scattered, to facilitate the soldering operation, and to prevent disconnection.

  In another aspect of the present invention, it is preferable that the stator further includes a substantially annular connecting portion that connects a plurality of support portions. Thereby, a some terminal pin can be easily fixed to a stator.

  In another aspect of the present invention, it is preferable that a substantially cylindrical bearing housing is integrally formed on the inner peripheral surface of the annular coupling portion. Furthermore, it is preferable that the stator core further includes a substantially annular core back that connects a plurality of teeth, and the inner peripheral surface of the core back is disposed in contact with the outer peripheral surface of the bearing housing. Thereby, the assembly of a stator can be made easy.

  In another aspect of the present invention, it is preferable that the radially inner end portion of the terminal pin extends to a position overlapping with the teeth. Thereby, a terminal pin can be fixed to a stator more firmly.

  According to the present invention, the terminal pin can be fixed to the stator while the conductor end of the coil is easily entangled with the terminal pin and the conductor is prevented from being disconnected. In addition, it is possible to prevent the windings from being scattered, to facilitate the soldering work, and to prevent disconnection. Thereby, a thin and highly reliable motor is realizable.

It is the fragmentary sectional view which showed the internal structure of the centrifugal fan provided with the motor which concerns on one Embodiment of this invention. It is the perspective view which showed the manufacturing method of the stator in this embodiment. It is the perspective view which showed the manufacturing method of the stator in this embodiment. It is the perspective view which showed the manufacturing method of the stator in this embodiment. It is the perspective view which showed the manufacturing method of the stator in this embodiment. It is the elements on larger scale which showed the combined state of a support part and a terminal pin, (a) is a top view, (b) is sectional drawing. It is the perspective view which showed the structure of the terminal pin.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the description of the present embodiment, a direction parallel to the central axis is referred to as “axial direction”, and a radial direction centered on the central axis is referred to as “radial direction”. The present invention is not limited to the following embodiments. Moreover, it can change suitably in the range which does not deviate from the range which has the effect of this invention. Furthermore, combinations with other embodiments are possible.

  FIG. 1 is a diagram illustrating an internal configuration of a centrifugal fan 100 including a motor 10 according to an embodiment of the present invention, and is a partial cross-sectional view cut along a plane including a central axis J.

  As shown in FIG. 1, the motor 10 includes a rotor 2 that rotates about a central axis J, and a stator 3 that rotatably supports the rotor 2 via a bearing portion 41. The stator 3 includes a stator core 31, a plurality of terminal pins 32, and a support portion 33. The stator core 31 includes a plurality of teeth 36 that extend radially outward from the central axis J. The plurality of terminal pins 32 extend radially outward from the central axis J. The support portion 33 supports the plurality of terminal pins 32 and is insulative. In the present embodiment, the “teeth” refers to a portion of the stator core 31 that protrudes radially outward from the outer peripheral portion of the core back 37 and around which a conductive wire is wound to form a coil ( (See FIG. 2).

  Insulating films 35 are formed on both surfaces of the plurality of teeth 36. The plurality of terminal pins 32 are sandwiched between a tooth 36 having an insulating film 35 formed on the surface and a support portion 33. At this time, since the insulating film 35 is interposed between the teeth 36 and the terminal pins 32, the terminal pins 32 and the teeth 36 are electrically insulated. Further, a coil 34 is formed by winding a conductive wire around the tooth 36 and the support portion 33, and an end 34 a of the conductive wire is entangled with the terminal pin 32 and electrically connected.

  The circuit board 50 is disposed on the opposite side of the support portion 33 from the stator core 31. The terminal pins 32 are electrically connected to land portions (not shown) formed on the circuit board 50.

  Here, the rotor 2 includes a substantially covered cylindrical rotor holder 22 and a field magnet 21 fixed to the inside of the side wall portion of the rotor holder 22. Further, the shaft 40 is press-fitted and fixed to the opening formed in the center portion of the rotor holder 22, and a plurality of impellers 70 are fixed to the outer periphery of the side wall portion of the rotor holder 22.

  The stator 3 is fixed to the outer peripheral surface of the bearing housing 39, and a sleeve (bearing portion) 41 that is a substantially cylindrical impregnated bearing is fixed to the inner peripheral surface of the bearing housing 39. A shaft 40 is press-fitted and fixed to the inner peripheral surface of the sleeve 41, whereby the rotor 2 is rotatably supported by the stator 3 via the sleeve 41. The stator 3 is fixed to the bottom of the housing 60 via the bearing housing 39.

  In the centrifugal fan 100, the impeller 70 fixed to the rotor 2 rotates, so that the air guided in the housing 60 forms an air flow path in the housing 60 and is sent out of the housing 60.

  2 to 5 are perspective views illustrating an exemplary method for manufacturing the stator 3 according to the present embodiment.

  First, as shown in FIG. 2, a stator core 31 having a plurality of teeth 36 extending from the central axis toward the radially outer side is prepared. The plurality of teeth 36 are connected by a substantially annular core back 37. The thickness of the stator core 31 is preferably about 0.2 mm to 2 mm. The stator core 31 may be configured by stacking several stator cores.

  Insulating films 35 are formed on both surfaces of the plurality of teeth 36. Here, the insulating film 35 is preferably formed by electrodeposition coating, powder coating, or the like in order to obtain a thin film having a thickness of about 0.02 mm to 0.2 mm.

  Next, as shown in FIG. 3, an insulating support portion 33 that supports a plurality of terminal pins 32 extending radially outward from the central axis is prepared. The plurality of support portions 33 are connected by a substantially annular connecting portion 38, and a substantially cylindrical bearing housing 39 is formed on the inner peripheral surface of the connecting portion 38. It is preferable that the support part 33, the connection part 38, and the bearing housing 39 are integrally formed by a single member. Moreover, it is preferable that the support part 33 is formed with resin, and the support part 33 and the plurality of terminal pins 32 are coupled by insert molding or outsert molding.

  Here, the thickness of the support portion 33 is preferably 0.3 mm or less. Moreover, it is preferable that the terminal pin 32 is comprised with the plate-shaped metal, and it is preferable that the thickness is 0.2 mm or less.

  Subsequently, as shown in FIG. 4, the prepared stator core 31 and the support portion 33 are brought into contact with each other with their central axes substantially coincident with each other. For this purpose, the outer peripheral surface of the bearing housing 39 may be inserted into the inner peripheral surface of the core back 37 of the stator core 31. The plurality of terminal pins 32 are sandwiched between the teeth 36 and the support portion 33. At this time, since the insulating film 35 is interposed between the teeth 36 and the terminal pins 32, the terminal pins 32 and the teeth 36 are electrically insulated.

  Further, as shown in FIG. 5, a coil 34 is formed by winding a conductive wire around the teeth 36 and the support portion 33. The end 34a of the conducting wire is entangled with the terminal pin 32 and electrically connected to the circuit board. Here, if a narrow portion 32 a that ties the end portion 34 a of the conducting wire is provided in a part of the terminal pin 32, the conducting wire end portion 34 a can be easily entangled with a fixed position of the terminal pin 32. . Furthermore, by providing the narrow portion 32a and tying the conducting wire end portion 34a thereto, the movement of the conducting wire end portion 34a toward the radially outward side and the inward side can be restricted.

  In the stator 3 manufactured by such a method, the plurality of terminal pins 32 are merely sandwiched between the teeth 36 having the thin insulating film 35 formed on the surface and the support portion 33. The thickness in the direction can be very thin. Further, since the teeth 36 and the terminal pins 32 extend in the same direction from the central axis J toward the outer side in the radial direction, the conductive wire end 34a of the coil 34 can be easily entangled and connected to the terminal pins 32. .

  Further, in the case of a system in which terminal pins are provided, the terminal pins are soldered to the land portions on the circuit board after the conductive wire ends are fixed to the terminal pins before the soldering operation. Therefore, it is possible to prevent the windings from being scattered, to facilitate the soldering operation, and to prevent disconnection.

  Further, since the plurality of terminal pins 32 are sandwiched between the teeth 36 and the support portions 33 and the coils 34 are formed by winding the conductive wires together around the teeth 36 and the support portions 33. The pin 32 can be fixed to the stator 3. The terminal pin 32 can be more firmly fixed to the stator 3 by extending the radially inner end of the terminal pin 32 to a position where it overlaps the teeth 36.

  In addition, by providing a part of the terminal pin 32 that is bent in the direction in which the circuit board 50 is disposed, the terminal pin 32 can be easily connected to a land portion formed on the circuit board 50. In addition, since the gap between the stator 3 and the circuit board 50 can be very narrow, a thinner motor can be realized.

  As shown in FIG. 5, two narrow portions 32a around which the end portions 34a of the conductor are entangled are provided in part of the terminal pins 32, and the conductor end portions 34a are respectively entangled at the two locations. May be connected. Specifically, a radially outer narrow part 321a and a radially inner narrow part 322a are provided, and a conductor end part 34a is entangled with each of them, and a conductor end part 34a entangled with the radially outer narrow part 321a is provided. Then, soldering is performed on the land portion formed on the circuit board 50. By doing so, the binding portion of the radially inner narrow portion 322a becomes a portion that is not soldered, and a binding portion that is not soldered is formed on the radially inner side of the soldering portion. Since this portion is not fixed with solder, when an impact is applied to the motor from the outside, the tangled portion that is not soldered can absorb the impact, so that disconnection of the conductor can be prevented. Note that the number of narrow portions 32a is not limited, and three or more narrow portions may be provided.

  By configuring the motor 10 as described above, the motor 10 can be thinned, and the conductive wire end portion 34a of the coil 34 can be easily entangled with the terminal pin 32, while preventing breakage of the conductive wire. The terminal pins 32 can be firmly fixed to the stator 3.

  In the present embodiment, the support portion 33 and the plurality of terminal pins 32 are preferably coupled by insert molding or outsert molding. At this time, at least a part of the terminal pin 32 may be supported by the support portion 33 only at a portion opposite to the stator core 31, as shown in FIG. Thereby, a stator can be made thinner. As shown in FIG. 3, an insulating film 35 is formed on the surface of the teeth 36 of the stator core 31 even if the terminal pins 32 are exposed on the surface of the support portion 33. For this reason, as shown in FIG. 4, even if the terminal pin 32 is sandwiched between the tooth 36 and the support portion 33, the insulation between the terminal pin 32 and the tooth 36 is not impaired.

  A part of the terminal pin 32 may be embedded in the support portion 33 as shown in FIG. FIG. 6 is a partially enlarged view showing a state in which the support portion 33 and the terminal pin 32 are coupled by insert molding or outsert molding. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along VIb-VIb in FIG. 6A. Thus, by embedding a part of the terminal pin 32 in the support part 33, the support of the terminal pin 32 by the support part 33 can be strengthened more.

  In order to prevent the terminal pin 32 from coming off from the support portion 33, it is preferable that the side portion of the terminal pin 32 has a zigzag shape at a portion where the terminal pin 32 is embedded in the support portion 33. Alternatively, a hook portion may be provided on a part of the terminal pin 32.

  By the way, as shown in FIG. 2, the tip of the tooth 36 includes a peripheral edge 36a extending in the circumferential direction around the central axis. In this case, in order to prevent the terminal pin 32 from coming off from the support portion 33, as shown in FIG. 7, a portion 32b extending in the circumferential direction along the peripheral portion 36a may be provided in a part of the terminal pin 32. Good.

  In the present embodiment, the plurality of support portions 33 are connected by a substantially annular connection portion 38. However, each support part 33 may be independent. In this case, the support portion 33 is formed of an insulating film, and each terminal pin 32 is sandwiched between each of the divided teeth 36 and the insulating film, and a conductive wire is provided around each tooth 36 and the insulating film. The coil 34 can be formed by winding together.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible. For example, in the above embodiment, an oil-impregnated bearing made of a sleeve is used as the motor bearing mechanism. However, a ball bearing type bearing mechanism may be used as a motor bearing mechanism. Moreover, although the example which uses the motor which concerns on the said embodiment as a drive source of a centrifugal fan was demonstrated, for example, it may be used as a drive source of an axial flow fan, and is utilized for purposes other than the drive of a fan. May be.

  Moreover, in the said embodiment, the support part 33, the connection part 38, and the bearing housing 39 are integrally formed by the single member. However, a structure in which the support portion 33 and the connecting portion 38 are integrally formed by a single member such as a resin may be fitted into the metal bearing housing 39, or may be fitted into the resin bearing housing 39. It may be. Further, since the part 32b is sandwiched between the peripheral edge 36a and the support part 33, even if the part sandwiched between the teeth 36 and the support part 33 is only the part 32b, the terminal pin 32 and the stator 3 are connected. It is possible to fix.

2 Rotor 3 Stator 10 Motor 21 Field Magnet 22 Rotor Holder 31 Stator Core 32 Terminal Pin 32a, 321a, 322a Narrow Part 32b Site Extending in the Circumferential Direction 33 Support Part 34 Coil 34a Conductive Wire End 35 Insulating Film 36 Teeth 36a Peripheral Part 37 Core back 38 Connecting portion 39 Bearing housing 40 Shaft 41 Sleeve (bearing portion)
50 Circuit board 70 Blade 100 Centrifugal fan

Claims (19)

A rotor that rotates about a central axis;
A stator that rotatably supports the rotor via a bearing portion;
With
The stator is
A stator core having a plurality of teeth extending radially outward from the central axis;
A plurality of terminal pins extending radially outward from the central axis;
An insulating support for supporting the plurality of terminal pins;
Have
An insulating film is formed on both surfaces of the plurality of teeth,
The plurality of terminal pins are sandwiched between the teeth and the support portion so that the insulating film is interposed between the teeth and the terminal pins,
Around the teeth and the support portion, a conductive wire is wound together to form a coil,
A motor, wherein an end portion of the conducting wire is electrically connected to the terminal pin. The motor according to claim 1,
The stator further includes a substantially annular connecting portion that connects the plurality of support portions. The motor according to claim 2,
A motor in which a substantially cylindrical bearing housing is integrally formed on an inner peripheral surface of the annular coupling portion. The motor according to claim 3,
The stator core further includes a substantially annular core back that connects the plurality of teeth.
The motor, wherein an inner peripheral surface of the core back is disposed in contact with an outer peripheral surface of the bearing housing. The motor according to claim 1 or 2,
The said support part is formed with resin, The said support part and these terminal pins are couple | bonded by insert molding or outsert molding. The motor according to claim 1,
A circuit board is arranged on the side opposite to the stator core with respect to the support part,
The terminal pin is a motor that is electrically connected to an electrode formed on the circuit board. The motor according to claim 1,
A motor in which a radially inner end portion of the terminal pin extends to a position overlapping with the teeth. The motor according to claim 1,
The motor in which at least a part of the plurality of terminal pins is supported by the support portion only at a portion opposite to the stator core. The motor according to claim 1,
The said support part is a motor comprised with the insulating film. The motor according to claim 1,
The terminal pin is a motor made of a plate-like metal. The motor according to claim 1,
A motor in which a portion bent in a direction in which the circuit board is arranged is provided in a part of the terminal pin. The motor according to claim 1,
A motor in which a narrow part to which an end part of the conducting wire is bound is provided in a part of the terminal pin. The motor according to claim 1,
A part of the terminal pin is embedded in the support portion, and the side portion of the terminal pin has a zigzag shape in the embedded portion. The motor according to claim 1,
The tip of the teeth includes a peripheral edge extending in the circumferential direction around the central axis,
A motor, wherein a portion extending in the circumferential direction along the peripheral edge portion is provided on a part of the terminal pin. The motor according to claim 1,
The motor, wherein the insulating films formed on both surfaces of the plurality of teeth are thin films formed by insulating coating. The motor according to claim 1,
The motor has a thickness of 0.3 mm or less. The motor according to claim 1,
The terminal pin has a thickness of 0.2 mm or less. It is a manufacturing method of the stator used for the motor of Claim 1,
Preparing a stator core having a plurality of teeth extending radially outward from the central axis;
Providing an insulating support portion for supporting a plurality of terminal pins extending radially outward from the central axis;
Forming an insulating film on both surfaces of the plurality of teeth;
The stator core and the support portion are brought into contact with the central axis substantially coincident with each other, and the plurality of terminal pins are arranged so that the insulating film is interposed between the teeth and the terminal pins. And the process of clamping between
Forming a coil by winding a conductive wire around the teeth and the support;
Electrically connecting the end of the conducting wire to the terminal pin. A motor according to claim 1;
An impeller that rotates with the rotor of the motor;
A fan comprising the motor and a housing that houses the impeller and forms an air flow path.

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