JP2007143295A - Dc brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in a conventional constitution of a DC brushless motor, wire connecting work is complicated to cause an increase in work man-hour since there are two fixing places of a winding for connecting the winding to a drive circuit board. <P>SOLUTION: Protrusions 11 are formed at a drive circuit and a sensor circuit board, and the winding 13 wound to a stator 6 is directly connected to the protrusions of the drive circuit and the sensor circuit board. By connecting only a part of wound parts of the protrusions, a non-connected part absorbs thermal stress, thus eliminating the breakage of a wire. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to the structure of a DC brushless motor.

As shown in FIG. 9, this type of conventional DC brushless motor is a motor having a configuration in which a disc-shaped control board 503 is attached to a stator 502 having a winding 501, and a rib for receiving the disc-shaped control board 503. Is provided with a groove portion 504 for temporarily fixing the end portion of the winding 501 of the stator 502, and the winding is temporarily fixed to the groove portion 504, and the winding 501 is fixed to the winding mounting terminal 505 of the disc-shaped control board 503. (For example, refer to Patent Document 1).
JP 2001-245455 A

  However, in the configuration as described above, since there are two fixed portions of the winding 106 for connecting the winding 106 to the disk-shaped control board 103, the wiring work becomes complicated and the work man-hours are increased. It was.

  The present invention solves the above-described conventional problems. By winding the winding directly around the protrusion of the drive circuit board, the connection work is simplified and the number of work steps is reduced. However, since the winding wound around the stator is directly wound around the protrusion of the drive circuit board, disconnection is likely to occur due to thermal stress. By joining only a part of the winding part of the protrusion, the part that is not joined can absorb the thermal stress and eliminate the disconnection.

  In order to solve the above-described conventional problems, a DC brushless motor according to the present invention includes a rotor that is rotatably supported via a bearing, a bracket portion that holds the bearing, a stator that is fixed by the bracket, and an internal portion of the motor. A DC brushless motor having a drive circuit and a sensor circuit board, wherein a protrusion is provided on the drive circuit and the sensor circuit board, and a winding wound around the stator is directly connected to the protrusion of the drive circuit and the sensor circuit board.

  Since the winding wound around the stator is directly wound around the protrusions of the drive circuit and the sensor circuit board, disconnection is likely to occur due to thermal stress. Can be absorbed and disconnection can be eliminated.

  In the DC brushless motor of the present invention, the driving circuit and the sensor circuit board are provided with protrusions, and the windings wound around the stator are directly connected to the protrusions of the driving circuit and the sensor circuit board. Less. Further, by changing the shapes of the protrusions of the drive circuit and the sensor circuit board, it becomes easier to couple only a part of the winding portion.

A first invention is a DC brushless motor having a rotor held freely via a bearing, a bracket portion holding the bearing, a stator fixed by the bracket, and a drive circuit inside the motor, Protrusions are provided on the drive circuit and sensor circuit board, and windings wound around the stator are directly connected to the protrusions of the drive circuit and sensor circuit board. By connecting the windings directly to the protrusions of the drive circuit and the sensor circuit board, the work is simplified and the number of work steps is reduced. Further, if the winding is directly wound around the protrusions of the drive circuit and the sensor circuit board, it is easy to break due to thermal stress. By partially coupling the winding wound around the protrusion, the portion that is not coupled can absorb thermal stress, and disconnection can be eliminated.

  According to a second aspect of the present invention, a protrusion is provided in the concave portion of the drive circuit and the sensor circuit board, a winding is wound around the protrusion of the board, and the fixing of the drive circuit and the sensor circuit board and the winding part is partially fixed. As a result, it becomes easy to fix partially, the work is simplified, and the number of work steps is reduced.

  In the third invention, the shape of the protrusion is large at the root portion, the width at the tip portion is small, and the winding is partially fixed, so that it is easy to fix partially and the work is simplified and the number of work steps Less.

  In the fourth aspect of the invention, the protrusion is provided in the central portion and the winding is partially fixed, so that it is easy to fix the winding partially, the work is simplified, and the number of work steps is reduced.

  In the fifth aspect of the invention, the shape of the end of the projection is corrugated and the winding is partially fixed, so that it is easy to fix the winding partially, the work is simplified, and the number of work steps is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a partial cross-sectional view of the DC brushless motor of the present embodiment. FIG. 2 shows a completed stator view. FIG. 3 shows a drive circuit board. FIG. 4 shows an enlarged view of the winding portion.

  The DC brushless motor in the form of this entity has a rotor completed body 5 including a magnet 1, a shaft 2, a bearing A3, and a bearing B4. A drive circuit board 8 on which a drive IC 7 is mounted is attached to the finished stator 6. The rotor completed body 5 and the stator completed body 6 are fixed to each other by brackets A9 and B10. A protrusion 11 having a width of 4 mm and a height of 6 mm is provided on the drive circuit board 8, and the end of the winding 13 wound around the stator 12 is wound around the protrusion 11 five to seven times, and the tip three times wound around the protrusion 11 is formed. The winding part is fixed with solder 12 or the like. By constituting the portion that does not fix the winding 13 and the portion that is not fixed, the shrinkage of the winding 13 due to thermal stress can be absorbed by the portion that does not have the solder 12 to prevent disconnection. Further, by directly connecting the stator winding 13, the work is simplified and the number of work steps is reduced.

(Embodiment 2)
FIG. 5 shows an enlarged view of the starting circuit board portion of the present embodiment.

The present embodiment is different from the first embodiment in the shape of the protrusion 111, and is the same as the first embodiment in other points.
In the present embodiment, as shown in FIG. 5, the protrusion 111 is provided in the concave portion of the drive circuit board 108. The recess has a width of 4 mm and a height of 6 mm. The end of the winding 113 wound around the stator is wound around the protrusion 111 five to seven times, and the tip of the winding 113 wound around the protrusion 111 is fixed with solder 112 or the like. By configuring the portion that does not fix the winding portion and the portion that does not fix the winding portion, disconnection of the winding 113 due to thermal stress can be prevented. Further, by directly connecting the stator winding 113, the work is simplified and the number of work steps is reduced (Embodiment 3).
FIG. 6 shows an enlarged view of the drive circuit board portion of the present embodiment.

  This embodiment is different from the above-described second embodiment in the shape of the protrusion 211, and is the same as the second embodiment in other points. The shape of the protrusion 211 is 3 mm at the base and 4 mm in width, and the tip is 3 mm in height and 3 mm in width. By changing the area of the protruding portion 211, it becomes easy to distinguish the fixed portion, the work is simplified, and the number of steps is reduced.

(Embodiment 4)
FIG. 7 shows an enlarged view of a portion of the drive circuit board of the present embodiment.

  The present embodiment is different from the above-described second embodiment in the shape of the protrusion 311 and is the same as the second embodiment in other points. A protrusion 312 is provided in the center of the protrusion 311. Providing a protrusion 612 having a width of 6 mm and a height of 1 mm at the center of the protrusion 311 having a width of 4 mm and a height of 6 mm makes it easy to distinguish the fixed portion, thereby simplifying the operation and reducing the number of steps.

(Embodiment 5)
FIG. 8 is an enlarged view of a part of the starting circuit board according to the present embodiment.

  The present embodiment is different from the above-described second embodiment in the shape of the protruding portion 411, and is the same as the second embodiment in other points. By making the shape of the end of the protruding portion 411 into the waveform shape 412, the winding 413 is wound along the waveform, so that the winding becomes easy. There is no variation in the winding position of the winding 413, and the solder 414 of the fixed portion becomes easy, the work is simplified, and the number of steps is reduced.

  As described above, the DC brushless motor according to the present invention works by directly connecting the windings wound around the stator to the driving circuit and the sensor circuit board and providing the protrusions on the driving circuit and the sensor circuit board. This simplifies and reduces man-hours. Further, by changing the shapes of the protrusions of the drive circuit and the sensor circuit board, it is easy to connect only a part of the winding portion, and it can be applied to an outdoor unit motor of an air conditioner.

Partial sectional view of DC brushless motor in Embodiment 1 of the present invention Completion drawing of stator of DC brushless motor in Embodiment 1 of the present invention Drive circuit board diagram of DC brushless motor in Embodiment 1 of the present invention The elements on larger scale of the DC brushless motor in Embodiment 1 of this invention The elements on larger scale of the DC brushless motor in Embodiment 2 of this invention The elements on larger scale of the DC brushless motor in Embodiment 3 of this invention The elements on larger scale of the DC brushless motor in Embodiment 4 of this invention The elements on larger scale of the DC brushless motor in Embodiment 5 of this invention Partial sectional view of a conventional DC brushless motor

Explanation of symbols

1 Magnet 2 Shaft 3 Bearing A
4 Bearing B
5 Completed rotor 6 Completed stator 7 Drive IC
8 Drive circuit board 9 Bracket A
10 Bracket B
11 Protrusion 12 Solder 13 Winding

Claims (5)

A DC brushless motor having a rotor held rotatably through a bearing, a bracket portion holding the bearing, a stator fixed by the bracket, and a drive circuit and a sensor circuit inside the motor, the drive circuit A DC brushless motor characterized in that a protrusion is provided on a substrate and a winding wound around a stator is directly wound around a protrusion on a drive circuit substrate and partly coupled. The drive circuit and the sensor circuit board are each provided with a plurality of protrusions in the recesses, and the winding wound around the stator is directly wound around the drive circuit and the sensor circuit board and is partially coupled. The DC brushless motor according to 1. The shape of the protrusions of the drive circuit board and the sensor circuit board has a large width at the root portion and a small width at the tip portion, and the winding wound around the stator is directly wound around the protrusions of the drive circuit and the sensor circuit board. The DC brushless motor according to claim 1, wherein the DC brushless motor is coupled. The shape of the protrusions of the drive circuit and sensor circuit board is provided with a protrusion at the center, and the winding wound around the stator is directly wound around the protrusions of the drive circuit and sensor circuit board and partially coupled. Item 4. A DC brushless motor according to Item 1. 2. The DC brushless motor according to claim 1, wherein the shape of the end of the protrusion is corrugated, and the winding wound around the stator is directly wound around the protrusion of the drive circuit and the sensor circuit board.

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