JP2017046476A - Motor and blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor which enables easy connection work of a wiring pulled out from a circuit board and prevents downsizing from being hindered, and to obtain a blower.SOLUTION: A motor includes: a stator 200 including salient poles and a stator coil 203 wound around the salient poles; a rotor 300 which includes blades 406 and may rotate relative to the stator 200; a circuit board 210 fixed to the stator 200; a lead wire 209 which is connected to the circuit board 210 and arranged along a periphery of the circuit board 210 to be pulled out from the circuit board 210; and connection pins 211 which are disposed on the circuit board 210 and hold the lead wire 209 arranged along the periphery of the circuit board 210.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor and a blower that are characterized by a wiring structure.

  For the blower, for example, a structure described in Patent Document 1 is known. In the structure described in Patent Document 1, wiring is drawn from the substrate to the outside of the case via a rib. A structure in which a loop portion is formed in a wiring is also known (see Patent Document 2).

JP 2003-204176 A JP 2001-352181 A

  When the connector is directly attached to the case of the blower, the wiring drawn from the circuit board is shortened, so that the soldering work between the board and the wiring or the soldering work between the connector and the wiring becomes difficult. As a method of alleviating this problem, a method of giving a margin to the length of the wiring is conceivable, but the processing of the remaining wiring finally becomes a problem. The blower is strongly required to be miniaturized, and it is difficult to secure a space for storing excess wiring. In such a background, an object of the present invention is to provide a blower that facilitates connection work of wiring drawn from a circuit board and does not hinder downsizing.

  The present invention includes a stator having a plurality of salient poles and a stator coil wound around each of the plurality of salient poles, a rotor capable of rotating with respect to the stator, and a circuit board fixed to the stator. A plurality of pins arranged along a peripheral edge of the circuit board, and lead wires connected to the circuit board, routed along the outside of the plurality of pins, and drawn from the circuit board. It is a motor characterized by this.

  In the above invention, the plurality of pins may be fixed to the stator, and the plurality of pins may penetrate the circuit board.

  In the above invention, the circuit board may have a substantially circular periphery.

  In the above invention, the lead wire may be composed of a plurality of wires, and the plurality of wires constituting the lead wire may be bundled by a bundling tube.

  This invention can also be grasped | ascertained as an air blower provided with at least one part of said structure.

  ADVANTAGE OF THE INVENTION According to this invention, the air blower which the connection operation | work of the wiring pulled out from the circuit board is easy and size reduction is not inhibited is obtained.

It is sectional drawing of embodiment. It is sectional drawing which shows the state which connected the lead wire to the circuit board fixed to the stator, and also wound the lead wire around the circuit board. It is the perspective view (a) of a circuit board, and the perspective view (b) which shows the state which fixed the circuit board to the stator. FIG. 4 is a perspective view showing a state in which the lead wire is connected to the circuit board in the state of FIG. 3B and the lead wire is routed along the peripheral edge of the circuit board. It is a perspective view which shows the state which wound up the lead wire along the periphery of a circuit board.

(Constitution)
Drawing 1 is a sectional view which cut blower 100 of an embodiment along the direction of an axis. Here, the axial direction is defined as the extending direction of the rotating shaft of the blower 100. The blower 100 is an axial fan and has an outer rotor type motor structure including a stator 200 and a rotor 300 that rotates on the outside thereof.

  The stator 200 includes a stator core 201, an insulator 202, and a stator coil 203. The stator core 201 has a structure in which a plurality of plate-like soft magnetic materials such as electromagnetic steel plates are laminated. The stator core 201 includes a plurality of salient poles extending in a direction away from the axis center, and a stator coil 203 is wound around each of the salient poles via a resin insulator 202. This structure is the same as a normal outer rotor type brushless motor.

  The stator 200 is fixed to a resin bearing housing 204. The bearing housing 204 has a cylindrical shape, and the stator core 201 is fixed to the outside by an adhesive. In this example, the stator 200 is fixed to the bearing housing 204 by fixing the stator core 201 to the bearing housing 204. The outer rings of the ball bearings 401 and 402 are fixed inside the bearing housing 204. Inner rings of the ball bearings 401 and 402 are fixed to a shaft 403 serving as a rotating shaft. The shaft 403 is held by the ball bearings 401 and 402 in a freely rotatable state in the bearing housing 204. A sliding bearing can be used instead of the ball bearing.

  The bearing housing 204 is fixed to the base housing 205. The base housing 205 is made of resin and is formed integrally with the fixed blade 206 and the outer casing 207. A plurality of fixed blades 206 are arranged, hold the casing 207, and do not disturb the flow of the airflow in the axial direction. The casing 207 is a member constituting the outside of the housing, and has a substantially rectangular ring shape with rounded corners when viewed from the axial direction. A housing 400 is constituted by the bearing housing 204, the base housing 205, the fixed blade 206, and the casing 207.

  A connector 208 is provided on the casing 207. External wiring is connected to the connector 208. Driving power is supplied to the connector 208 from this wiring, and the blower 100 operates. Inside the blower 100, a lead wire 209 is connected to the connector 208, and the lead wire 209 is connected to the circuit board 210.

  The circuit board 210 is a printed circuit board (PCB board) having an annular shape when viewed from the axial direction, and is mounted with a drive circuit that generates a drive signal to be supplied to the stator coil 203. The circuit board 210 is fixed to the stator 200 by connection pins 211. The connection pin 211 is embedded and fixed in the insulator 202 constituting the stator 200. The connection pin 211 is made of metal and functions as a connection terminal pin to which an end portion of a coil winding constituting the stator coil 203 is connected. Further, the connection pin 211 functions as a fixing member that fixes the circuit board 210 to the stator 200 and a guide member that guides the lead wire 209 that is routed in a circular shape.

  The circuit board 210 is provided with holes 213 (see FIG. 3A) for connecting the connection pins 211. The hole 213 penetrates the front and back of the circuit board 210, and a copper foil pattern through which a drive signal flows is provided around the hole 213. By inserting the connection pin 211 into the hole 213 and fixing the connection pin 211 to the copper foil pattern by soldering, the stator coil 203 is electrically connected to the circuit board 210 via the connection pin 211. Further, the circuit board 210 is supported by the stator 200 by the connection pins 211 embedded in the insulator 202. That is, the connection pins 211 electrically connect the stator coil 203 to the circuit board 210 and fix the circuit board 210 to the stator 200.

  In the case of a single-phase motor, the number of connection pins is three. However, in order to stably hold the wiring, a pin (dummy pin) that is not electrically connected is provided in the stator 200, and the dummy pin is passed through a hole provided in the substrate 210. Is also possible. The number of connection pins is not limited to three and may be four or more. The number of dummy pins is not particularly limited, and can be selected from one or a plurality. Also, a hole that penetrates the front and back sides is provided in the circuit board 210, and a copper foil pattern (circular copper foil pattern) that can be fixed by solder not related to circuit wiring is provided around the hole, and this copper foil pattern is used. A structure in which a pin (for example, the dummy pin) passed through the hole is fixed to the circuit board 210 by soldering is also possible.

  A pin (connection pin or dummy pin) may be fixed by press-fitting into a hole provided in the circuit board 210. In addition to the press-fitting or instead of the press-fitting, it is possible to fix the pin in the hole using an adhesive. In view of cost, it is preferable to have a structure in which pins are arranged at equal intervals. The length of the pin protruding from the circuit board is preferably longer than the diameter of a state in which a plurality of wires are bundled, and further not to contact the lower surface of the base housing 205 on the space 212 side.

  A lead wire 209 connected to the connector 208 is connected to the circuit board 210. The lead wire 209 is configured by a plurality of (in this case, four) wires. The four lead wires 209 are bundled by a bundling tube 209a. 1 and 2 show a state in which the bundling tube for bundling the four lead wires 209 is omitted. Each of the four lead wires 209 has one end connected to the connector 208 and the other end connected to the circuit board 210 by soldering. Of course, a structure in which one or both of the connection of the lead wire 209 to the connector 208 and the circuit board 210 is performed by a connection terminal is also possible.

  One end of the lead wire 209 is connected to the circuit board 210, and is then led around the peripheral edge of the substantially circular circuit board 210 so as to be guided and wound up by the connection pins 211, and further drawn out from the circuit board 210. The other end is connected to the connector 208.

  FIG. 3A shows the circuit board 210 at a stage before the lead wire 209 is connected. In FIG. 4, a lead wire 209 composed of four wires bound by a binding tube 209a is connected to a connection copper foil pattern of a circuit board 210 by soldering, and a connection pin is drawn so as to draw a circle therefrom. A state of being drawn round (in other words, wound up in a circular shape) while being held in the state 211 is shown. In FIG. 5, the lead wire 209 is wound up roundly by rotating the lead wire 209 about one turn along the peripheral edge of the circuit board 210 in a state where the tip 211 a of the connection pin 211 is bent outward. A structure is shown in which the lead wire 209 wound in a round shape is not removed.

  Returning to FIG. 1, the shaft 403 is fixed to the rotor hub 405. A spring 404 is disposed between the rotor hub 405 and the ball bearing 401, and a pressure is applied to the inner ring of the ball bearing 401. The rotor hub 405 is made of resin and has a substantially cup shape, and blades 406 are integrally formed on the outer periphery thereof. A cylindrical rotor yoke 407 made of a magnetic material is disposed on the inner peripheral side of the rotor hub 405, and a rotor magnet 408 is disposed on the inner side. The rotor magnet 408 is a permanent magnet having a cylindrical structure and magnetized with SNSN ··· along the circumferential direction.

(Operation)
When a drive current flows through the stator coil 202, an attractive force and a repulsive force act between the salient poles of the stator core 201 and the salient poles of the rotor magnet 408. Then, the polarity of the drive current supplied to the stator coil 203 is switched at a specific timing by the drive circuit on the circuit board 210, so that the relationship between the attraction force and the repulsive force is switched, and the rotor hub 405 is connected to the stator 200. Rotate against.

(Assembly process)
A procedure for assembling the blower 100 will be described. First, the stator 200 composed of the stator core 201, the insulator 202, and the stator coil 203 is assembled. Here, the insulator 202 having the connection pins 211 embedded in advance is used. In assembling the stator 200, the end of the winding of the stator coil 203 is connected to the root of the connection pin 211 embedded in the insulator 202, and the connection portion 211a is fixed with solder.

  Next, the protruding portion of the connecting pin 211 protruding in the axial direction is inserted into a hole 213 (see FIG. 3) provided in the circuit board 210. At this time, the tip of the connection pin 211 is made to penetrate the circuit board 210 and the tip is projected to the back side of the circuit board 210 (lower side in FIG. 1). Thereafter, the base portion of the connection pin 211 protruding from the circuit board 210 is connected to the copper foil pattern of the circuit board 210 by soldering. Thus, the electrical and physical connection between the connection pin 211 and the circuit board 210 is performed, and the electrical connection between the stator coil 203 and the circuit board 210 is further performed. This state is shown in FIG.

  Next, the lead wire 209 bound by the binding tube 209a is prepared, and one end thereof is soldered to the connecting copper foil portion of the circuit board 210 (see FIG. 4). Also, the other end of the lead wire 209 is soldered to the connector 208. At this time, the length of the lead wire 209 is adjusted so that the length of the lead wire 209 is appropriate in the final configuration. FIG. 4 shows a state in which the lead wiring 209 whose tip is solder-connected to the circuit board 210 is drawn round along the connection pin 211 and wound about ½ round. FIG. 1 shows a state in which the lead wire 209 composed of four wires is not bundled with a bundling tube, and FIG. 4 shows the lead wire 209 composed of four wires connected to a bundling tube. The state bound at 209a is shown.

  FIG. 4 shows an example in which the lead wire 209 is routed without bending the tip of the connection pin 211. Here, the tip 211b of the connection pin 211 can be bent outward at an appropriate timing to form a bowl shape so that the wound lead wire 209 does not come off (see FIG. 5).

  Next, the housing 400 to which the bearing housing 204 is attached is prepared. Then, an adhesive is applied to one or both of the outer periphery of the bearing housing 204 and the inner periphery of the stator core 201, and as shown in FIG. 4 or 5, the lead wires 209 are connected to the connection pins 211 (four in this example). The stator core 201 is fitted into the bearing housing 204 while rotating the stator 200 so as to wrap around the outer circumference.

  At this time, the lead wire 209 is wound around the circuit board 210 by rotating the stator 200. Here, it is assumed that the lead wire 209 is wound for about one rotation (about one turn). That is, the lead wire 209 is simultaneously wound around the periphery of the circuit board 210 by pressing the stator 200 against the bearing housing 204 while rotating it. Thus, in a state where the stator 200 is attached to the housing 400, the lead wire 209 is wound around the circuit board 210, and the lead wire 209 drawn from the circuit board 210 to the connector 208 is prevented from being loosened unnecessarily.

  On the other hand, the rotor 300 is prepared. The rotor 300 is obtained by integral molding using a resin as a raw material. That is, the rotor hub 405 and the blades 406 constituting the rotor 300 are made of resin. By integrally molding the resin with the shaft 403 and the rotor yoke 407 as the core, the rotor 300 having a structure in which the resin rotor hub 405 and the blades 406 are integrated with the metal shaft 403 and the rotor yoke 407 is obtained. When the rotor 300 is prepared, the rotor magnet 408 is fixed to the inner peripheral surface of the rotor yoke 407 integrated with the rotor 300 with an adhesive.

  Next, a housing 400 in which the stator core 201, the circuit board 210, and the lead wires 209 are assembled is prepared, and the ball bearings 401 and 402 are attached to the bearing housing 204. Next, the shaft 403 of the rotor 300 is inserted and fixed to the ball bearings 401 and 402 with the spring 404 interposed therebetween. In this way, the blower 100 having the structure shown in FIG. 1 is obtained. In this state, the lead wire 209 is held by the four connection pins 211 and is wound up in a round shape. The wound portion is accommodated in a space 212 between the circuit board 210 and the base housing 205. This space 212 is a space provided for routing the electronic components and the lead wiring 209 on the circuit board 210 and does not hinder downsizing of the blower 100.

(Superiority)
As described above, the blower 100 includes the stator 200 including the plurality of salient poles extending in the direction away from the axial center and the stator coil 203 wound around each of the plurality of salient poles, and the blade 406. The rotor 300 that can rotate with respect to the stator 200, the circuit board 210 fixed to the stator 200, and connected to the circuit board 210, routed along the periphery thereof, and then pulled out from the circuit board 210. A lead wire 209 and a connection pin 211 arranged on the circuit board 210 and holding the lead wire 209 along the periphery of the circuit board 210 are provided.

  If the length of the lead wire 209 is set to be the shortest without adopting the lead wire 209 routing structure of this embodiment, the circuit board 210 or connector while forcibly pulling the lead wire 209 It is necessary to connect to 208. In this case, workability is poor, and a large tension is applied to the lead wire 208, which may cause disconnection.

  On the other hand, in the present embodiment, the lead wire 209 can be routed between the circuit board 210 and the connector 208 with a margin of a length that can be wound around the circuit board 210 in a circumferential manner. And the problem of unnecessary tension acting on the lead wire 209 are avoided. In addition, since the remaining portion of the lead wire 209 is finally wound round on the edge portion of the circuit board 210, there is no problem that the lead wire 209 is loosened wastefully. Further, by winding the excess lead wire 209 around the periphery of the circuit board 210, the size reduction of the blower 100 itself is not hindered. That is, it is possible to obtain the blower 100 in which the connection work of the lead wire 209 drawn from the circuit board 210 is easy and the downsizing is not hindered.

DESCRIPTION OF SYMBOLS 100 ... Blower, 200 ... Stator, 201 ... Stator core, 202 ... Insulator, 203 ... Stator coil, 204 ... Bearing housing, 205 ... Base housing, 206 ... Fixed vane, 207 ... Casing, 208 ... Connector, 209 ... Lead wire, 210 DESCRIPTION OF SYMBOLS ... Circuit board 211 ... Connection pin 211a ... The part where the end part of the winding of the stator coil was entangled, 211b ... Tip of the connection pin 212 ... Space 213 ... Hole, 300 ... Rotor, 400 ... Housing 401 ... ball bearing, 402 ... ball bearing, 403 ... shaft, 404 ... spring, 405 ... rotor hub, 406 ... blade, 407 ... rotor yoke, 408 ... rotor magnet.

Claims (5)

A stator including a plurality of salient poles and a stator coil wound around each of the salient poles;
A rotor capable of rotating with respect to the stator;
A circuit board fixed to the stator;
A plurality of pins arranged along the periphery of the circuit board;
A motor comprising: a lead wire connected to the circuit board and routed along the outside of the plurality of pins and drawn from the circuit board. The plurality of pins are fixed to the stator,
The motor according to claim 1, wherein the plurality of pins penetrate the circuit board.   The motor according to claim 1, wherein the circuit board has a substantially circular periphery. The lead wire is composed of a plurality of wires,
The motor according to claim 1, wherein the plurality of wires constituting the lead wire are bundled by a bundling tube.   The air blower provided with the motor as described in any one of Claims 1 thru | or 4.

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