JPH1056765A - Dc brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely connect the terminal part of an armature coil at a DC brushless motor to a land, for terminal treatment, on a printed-circuit board. SOLUTION: Guide slots 14 which are formed in a printed-circuit board 8 are formed to be L-shapes which are provided with introduction parts 14a ends, on one side, of which are opened at the inner circumferential part of a shaft through-passage hole 8a in the board and with positioning parts 14b which are extended so as to be bent at right angles from ends, on the other side, of the introduction parts, and positioning holes 15 are formed in positions faced with the positioning parts 14b. Respective terminal parts 11n1 to 11n3 , 11u to 11w of an armature coil are derived to the rear side of the board through the positioning parts 14b at the corresponding guide slots. they are then bent so as to be extended along lands 12n1 to 12n3 , 13u to 13w for terminal treatment, and they are soldered to the lands for terminal treatment in a state that tip parts of the respective terminal parts are inserted into the corresponding positioning holes 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless DC motor in which a position sensor for detecting a rotational angle position of a rotor is mounted on a printed circuit board provided at one end of an axial direction of a stator.

[0002]

2. Description of the Related Art In a DC brushless motor in which a rotation angle position of a rotor is detected and an electric current is applied to an armature coil of a stator by an electronic switch circuit, a star wound around teeth of a stator core is generally used. A stator having an n-phase (n is an integer of 3 or more) armature coil connected in a form connection or an annular connection, a rotor having a magnet field, and a shaft through-hole for penetrating a rotating shaft of the rotor. A printed circuit board mounted on one end side in the axial direction of the stator with its surface facing the stator side, and a position sensor mounted on the surface of the printed circuit board and detecting a rotational angle position of the rotor. . A plurality of terminal processing lands corresponding to predetermined terminals of the armature coil are provided on the back surface of the printed circuit board, and the terminal portion of the armature coil is guided to the back surface side of the printed circuit board and the corresponding terminal processing land. Soldered.

FIGS. 5A and 5B show a connection between a terminal portion of an armature coil of a conventional DC brushless motor having a three-phase star-connected armature coil and a land for terminal processing on a printed circuit board. 5 shows an example of the structure of the unit. In these figures, reference numerals 11n1, 11n2 and 11n3 denote terminal portions on the neutral point side of the three-phase coils constituting the armature coil.
Numerals 1u, 11v and 11w are non-neutral side terminals of three-phase coils of the armature coils. Reference numeral 8 denotes a printed circuit board which is arranged on one end of the stator (not shown) in the axial direction and is screwed to the stator.
A shaft through hole 8a for passing the rotation shaft of the rotor is provided. On the back surface of the printed circuit board (the front side of the drawing), the terminal portions 11n1, 11n2, and 11n3 on the neutral point side of the armature coil are soldered to terminal processing lands 12n1, 12n2, and 12n3 for neutral points. And terminal processing lands 13 for non-neutral points to which the terminal portions 11u, 11v and 11w on the non-neutral point side of the armature coil are respectively soldered.
u, 13v and 13w are provided. The terminal lands 12n1, 12n2, and 12n3 for the neutral point are formed in a continuous shape. In FIG. 5 (A), portions other than the terminal processing lands of the print pattern are not shown. The printed circuit board 8 is also formed with guide slots 14, 14,... For guiding each terminal portion of the armature coil to a corresponding terminal processing land. One end of each guide slot 14 is formed in the shaft through hole 8a of the printed circuit board.
Is formed in a substantially I-shape which is open to the inner peripheral portion and the other end reaches a position close to the corresponding terminal processing land. Terminal portions 11n1 to 11n3 and 11u of armature coils
11w are terminal processing lands 12n1 to 12n, respectively.
Each of the bent terminal portions is led out from the front side to the rear side of the printed circuit board 8 through the guide slots 14 corresponding to n3 and 13u to 13w, and is bent along the corresponding terminal processing land (see FIG. 5B). Are soldered to the corresponding terminal processing lands.

FIG. 6 shows another example of a structure of a connecting portion between a terminal portion of an armature coil and a land for processing a terminal of a printed circuit board. In this example, a guide slot 14 is provided for a neutral point. Corresponding to the terminal processing lands 12n1 to 12n3 and the non-neutral terminal processing lands 13u to 13w, respectively, and an arc-shaped elongated hole 14a extending in the circumferential direction of the shaft through hole 8a of the printed circuit board. Grooves 14b protruding from the outer periphery of the hole toward a position close to each terminal processing land
Each terminal of the armature coil is led out to the back surface side of the printed circuit board 8 through the corresponding groove 14b of the guide slot and soldered to the corresponding terminal processing land.

[0005]

In a conventional brushless DC motor, as shown in FIG. 5, a terminal portion of an armature coil is connected to a substantially I-shaped guide slot having one end opened in a shaft through hole 8a of a printed circuit board. In the case where the terminal portion of the armature coil is bent out of the armature coil when the terminal portion of the armature coil is bent, the wire member of the armature coil is spring-backed as shown by a chain line in FIG. The part moves toward the opening of the guide slot, and the bent part of the terminal part is largely separated from the surface of the corresponding terminal processing land. Therefore, there is a problem that the soldering of the terminal portion of the armature coil to the terminal processing land becomes uncertain and reliability is reduced.

Further, as shown in FIG. 6, when the guide slot 14 is formed by the elongated hole 14a and the groove 14b, the guide slot does not open to the shaft through hole 8a. Although the movement of the terminal portion of the coil is restricted, in this case, it is necessary to lead the terminal portion to the back side of the printed circuit board through the narrow elongated hole 14a, so that the workability of the terminal processing operation deteriorates. There was a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a terminal for an armature coil which extends from a stator side to a back side of a printed circuit board without impairing workability. A direct current that can be positioned so as not to be largely separated from the surface of the corresponding land for terminal processing by springback of the wire, so that soldering of the terminal part to the land for terminal processing can be reliably performed. An object of the present invention is to provide a brushless electric motor.

[0008]

In order to solve the above-mentioned problems, according to the present invention, a guide slot corresponding to each terminal processing land and a terminal portion of an armature coil connected to the land is provided on a printed circuit board. And a positioning hole.

The guide slot has one end opened at the inner periphery of the shaft through hole of the printed circuit board, the other end reaching a position close to the corresponding terminal processing land, and bent from the other end of the introduction part. And a positioning portion extending in a direction substantially perpendicular to the introduction portion.

The positioning hole is provided at a position facing the positioning portion of the corresponding guide slot with a corresponding terminal processing land therebetween.

The terminal portion of the armature coil is led out to the back surface side of the printed circuit board through the positioning portion of the corresponding guide slot, bent along the corresponding terminal processing land, and its tip is inserted into the corresponding positioning hole. Solder to the corresponding terminal processing land in the inserted state.

With the above configuration, each terminal of the armature coil is guided to the back side of the printed circuit board through the shaft through hole of the printed circuit board, and then from the one end where the introduction portion of the corresponding guide slot is opened. By moving to the positioning part along the introduction part, it can be located at the positioning part. Therefore, it is not necessary to penetrate a small hole when guiding the terminal portion of the armature coil to the back surface side of the printed circuit board, and the workability is not impaired. The positioning portion of the guide slot extends in a direction substantially perpendicular to the introduction portion, and the end of the terminal portion of the armature coil is inserted into the positioning hole. The terminal section does not move due to springback and is not greatly separated from the surface of the corresponding terminal processing land, so that the terminal section can be securely soldered to the corresponding terminal processing land.

The positioning portion of the guide slot only needs to have a function of contacting the terminal portion of the bent armature coil to prevent the terminal portion from moving toward the shaft through hole by springback. Therefore, the positioning portion of the guide slot does not need to extend in a direction strictly at a right angle to the introduction portion of the guide slot, and has an angle close to 90 degrees to the introduction portion (when the terminal portion of the armature coil is It is only necessary that the terminal portion extends in a direction that forms an angle at which the terminal portion does not slide toward the introduction portion when contacting the positioning portion. Therefore, according to the present invention, the positioning portion of the guide slot extends in a direction substantially perpendicular to the introduction portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1A and 1B show an example in which the present invention is applied to a rotor abduction type DC brushless motor having a three-phase (n = 3) armature coil. FIG. 2 shows an electric configuration of the electric motor.

In these figures, reference numeral 1 denotes a 2 m pole (m is an integer, m is an integer) on the inner circumference of the yoke 2 formed substantially in a cup shape.
For example, the rotor has a magnet field 3 made of a permanent magnet having 8 poles when m = 4. One end of the rotating shaft 4 is fixed to the center of the bottom wall of the rotor. Reference numeral 5 denotes a stator arranged inside the rotor 1. Reference numeral 6 denotes a stator base, on which the stator 5 is mounted.
The rotating shaft 4 is supported via bearings 7,7. Reference numeral 8 denotes a printed circuit board disposed on one end side in the axial direction of the stator 5 with its surface facing the stator side. The printed circuit board has a shaft through hole 8a in the center thereof through which the rotating shaft 4 of the rotor passes.
And a slot 8b for inserting a lead wire constituting the wire harness 16 at a position near the end. The printed circuit board 8 is screwed to a printed circuit board mount 9 fixed to the stator 5.

The stator 5 has a stator core 10 having teeth having salient poles of 3 m poles (for example, 12 poles when m = 4) and an in-phase coil of coils concentrated around each salient pole of the core. U, V, W three-phase coil L by connecting coils in series
u, Lv and Lw (see FIG. 2). In the illustrated example, the armature coil 1
The terminal portions 11n1, 11n2, and 11n3 on the neutral point side of each phase coil 1 are commonly connected, and the three-phase coils Lu to Lw are star-connected.

Position sensors Hu, Hv and Hw for detecting the polarity of the magnet field of the rotor 1 to detect the rotational angle position of the rotor 1 are provided on the surface of the printed circuit board 8 (the surface on the side of the stator 5). And a rotation speed detection sensor Hr for detecting the rotation speed of the motor. These sensors are, for example, Hall ICs.

On the back surface of the printed circuit board 8, terminal portions 11n1 and 11n2 on the neutral point side of the coils of each phase of the armature coil 11.
And terminal terminals 11n, 12n2, and 12n3 for the neutral point to which solders 11n3 and 11n3 are respectively soldered, and terminal portions 11u and 11v on the non-neutral point side of each phase coil of the armature coil 11.
And land 11u, 13v and 13w for non-neutral point to which solders 11w and 11w are respectively soldered, and lead wire connecting lands 17a to 17i to which lead wires 16a to 16i constituting the wire harness 16 are connected, respectively. , Terminal processing lands 13u, 13v and 13w for non-neutral points
And conductor patterns 18u, 18v, and 18w for connecting the lead wires to the lead wire connection lands 17b to 17d, respectively.
u, Hv, Hw and Hr are connected to the lead wire connection land 17a.
And a conductor pattern 19 connected to 17e to 17i.

Lead wire 1 constituting wire harness 16
6a to 16i are guided to the front side of the printed circuit board through slots 8b provided in the printed circuit board 8, and respective cores of the lead wires 16a to 16i are passed through through holes provided in the printed circuit board 8 to form a back surface of the printed circuit board. Are soldered to the lead wire connection lands 17a to 17i on the side. The wire harness 16 is led out and connected to a control circuit (not shown) that controls the energization of the electric motor.

FIG. 3 shows only the printed circuit board 8 of the electric motor shown in FIG.
Illustration of conductor patterns and lands not directly related to the gist of the present invention is omitted. FIG. 4 (A) shows a terminal processing land 13u for a non-neutral point and a terminal portion 11 of an armature coil.
FIG. 4B is a cross-sectional view taken along the line BB of FIG. 4A.

The terminal processing lands 12n1, 12n2, and 12n3 corresponding to the terminal portions 11n1, 11n2, and 11n3 on the neutral point side of the coils of each armature coil are connected to the connecting portion 1
2a, and terminals 11u, 11v and 11w on the non-neutral point side of the coils of each phase of the armature coil.
The terminal processing lands 13u, 13v, and 13w respectively corresponding to are arranged in the circumferential direction independently of each other.

The printed circuit board 8 also has guide slots 14, 14,... Corresponding to the terminal portions of each terminal processing land and the terminal portion of each phase coil of the armature coil to be soldered to each terminal processing land. Are formed. One end of each guide slot 14 has an inner periphery of the shaft through hole 8a of the printed circuit board, as can be seen in the structure of the guide slot corresponding to the U-phase terminal processing land 13u shown in FIG. An introduction portion 14a which opens to the portion and the other end of which reaches a position close to the corresponding terminal processing land (13u in FIG. 4A), and which is bent from the other end of the introduction portion 14a and substantially perpendicular to the introduction portion. And a positioning portion 14b extending in various directions.

Each of the positioning holes 15 is provided at a position facing the positioning portion 14b of the corresponding guide slot 14 with a corresponding terminal processing land (13u in FIG. 4A) interposed therebetween. The terminal portion is formed in such a size that the tip of the terminal portion can be inserted.

The three-phase coils Lu to Lw of the armature coil 11 wound around the stator core 10 (see FIG. 1A) have neutral terminals 11n1, 11n2 and 11n3, and non-neutral terminals. 11u, 11v and 11w are printed circuit boards 8
Of the terminal processing lands 12n1, 12n2 and 12n3 and 13u, 13v and 13w.
Are introduced into the positioning portions 14b, 14b,... Through the introduction portions 14a of the respective guide slots. afterwards,
As shown in FIG. 4B, each terminal (11u in FIG. 4B) is bent along the surface of the corresponding terminal processing land (13u in the example of FIG. 4B), and The tip is inserted into the corresponding positioning hole 15 and positioned. In this state, each terminal section is soldered to the corresponding terminal processing land.

When the soldering of each part is performed by an automatic soldering device, before the stator 5 is press-fitted and fixed to the stator base 6, the printed circuit board 8 is screwed to the stator to fix each armature coil. With the terminal portion positioned as described above, the back surface of the printed circuit board 8 is immersed in a solder bath to perform soldering.

As described above, each terminal of each phase coil of the armature coil is located in the positioning section 14b extending in a direction perpendicular to the introduction section 14a of the guide slot 14, and the tip of each terminal is connected to the guide section 14. When inserted into the positioning hole 15 provided at a position opposed to the positioning portion 14b, each terminal portion does not largely separate from the surface of the corresponding terminal processing land due to spring back of the wire. Attachment can be performed reliably.

In the above-described embodiment, a DC brushless motor of the rotor abduction type in which the rotor is disposed outside the stator is taken as an example. However, a DC brushless motor of a rotor inversion type in which the rotor is disposed inside the stator. Needless to say, the present invention can be applied to any of the above.

In the above example, a three-phase armature in which the armature coil 11 is wound around a salient pole type stator core having 3 m poles (m is an integer, for example, m = 4 in the above example) and star-connected. The present invention is also applicable to a case where the armature coil is an n-phase armature coil which is generally wound around a salient-pole stator core having nm poles (n is an integer of 3 or more) and star-connected. Can be applied.

In the above example, the armature coil 11 is concentratedly wound around the salient pole-shaped stator core, but the armature coil is distributedly wound around the stator core and is connected in an star-shaped n-phase armature coil. The present invention can also be applied when used.

In the above example, the armature coil 11 is connected in a three-phase star connection. However, the present invention can be applied to a case where an n-phase armature coil is generally connected in a ring. In this case, the printed circuit board is provided with n independent terminal processing lands corresponding to predetermined terminal portions of the armature coil.

[0031]

As described above, according to the present invention, the guide slot provided on the printed circuit board for guiding the terminal portion of the armature coil to the back side of the printed circuit board has one end opened in the shaft through hole of the printed circuit board. And a positioning portion extending from the other end of the introduction portion in a direction substantially perpendicular to the introduction portion, and is formed in a substantially L-shape, and a positioning hole is provided at a position facing the positioning portion of the guide slot. In the state where each terminal of the armature coil passed through the positioning portion of the guide slot is bent along the corresponding terminal processing land and its tip is inserted into the positioning hole, each terminal portion and the terminal processing land And soldering,
Positioning of the terminal portion of the armature coil and soldering to the terminal processing land can be reliably performed, and the reliability of the DC brushless motor can be improved without impairing the workability of connecting the terminal portion.

[Brief description of the drawings]

FIG. 1 shows a configuration example of a brushless DC motor according to the present invention, in which (A) is a longitudinal sectional view, and (B) is a sectional view taken along line AA of (A).

FIG. 2 is a circuit diagram showing an electric configuration of the electric motor of FIG.

FIG. 3 is a front view showing a connection structure between a printed board used in the electric motor of FIG. 1 and a terminal portion of an armature coil, with a part of a conductive pattern provided on the board omitted;

FIG. 4 (A) is an enlarged view of a portion Z in FIG. 3, and FIG. 4 (B) is (A)
FIG. 7 is a sectional view taken along line BB of FIG.

FIG. 5A is a front view showing a state in which a terminal portion of an armature coil of a conventional DC brushless motor is connected to a terminal processing land on a printed circuit board, and FIG. 5B is a CC line of FIG. It is sectional drawing.

FIG. 6 is a front view showing a state in which a terminal portion of an armature coil of another conventional DC brushless motor is connected to a terminal processing land on a printed circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 3 Magnet field 4 Rotation axis 5 Stator 8 Printed circuit board 8a Shaft through-hole 10 Stator iron core 11 Armature coil 11n1-11n3 Neutral point side terminal part 11u-11w Non-neutral point terminal part 12n1-12n3 For neutral point Terminal processing lands 13u to 13w Non-neutral terminal processing lands 14, 14 Guide slots 14a Introducing sections 14b Positioning sections 15, 15 Positioning holes 16 Output lead wires Hu, Hv, Hw Position sensor Hr For rotation speed detection Sensor

Claims (1)

[Claims] 1. A stator having an armature coil wound around teeth of a stator core, a rotor having a magnet field, and a shaft through-hole for penetrating a rotation shaft of the rotor. A printed circuit board mounted on one end side in the axial direction of the printed circuit board with a surface facing the stator side, and a position sensor mounted on a surface of the printed circuit board to detect a rotational angle position of the rotor, On the back surface of the substrate, a plurality of terminal processing lands corresponding to predetermined terminal portions of the armature coil are provided, and the terminal portion of the armature coil is guided to the back surface side of the printed circuit board to correspond. In a DC brushless motor soldered to a terminal processing land, the printed circuit board is provided on each terminal processing land and a terminal portion of an armature coil connected to the land. A corresponding guide slot and a positioning hole, the guide slot having one end opened to the inner peripheral portion of the shaft through hole of the printed circuit board and the other end reaching a position close to the corresponding terminal processing land. And a positioning portion bent from the other end of the introduction portion and extending in a direction substantially perpendicular to the introduction portion. The positioning hole is formed in a substantially L-shaped shape. The terminal portion of the armature coil is provided at a position facing the positioning portion of the corresponding guide slot, and the terminal portion of the armature coil is led out to the back side of the printed circuit board through the positioning portion of the corresponding guide slot, and the corresponding terminal processing land. And is soldered to a corresponding terminal processing land with its tip inserted into the corresponding positioning hole. DC brushless motor.