JPH05308741A - Three-phase motor - Google Patents

Abstract

PURPOSE:To provide a simple structure of a circuit and prevent a malfunction caused by noises, by passing the end of a stator winding on the non-neutral side through a hole in a printed circuit board, and soldering the winding end to a land. CONSTITUTION:In a three-phase motor, a circuit pattern 22A is formed along a nearly peripheral part of a printed circuit board 16A for connecting each neutral-point winding end A1, B1 or C1, while three lands 30 are formed at an inner part of the peripheral part for connecting each winding end A2, B2 or C2 or the non-neutral side. The printed circuit board 16A has a through hole 32 for passing the lands 30 therein. A pin 34 is fitted rightly and inserted into the through hole 32 in the printed circuit board 16A so that the printed circuit board 16A is bonded to a fixing member 10A and the land 30 is soldered to the pin 34. The neutral side winding ends A1, B1 and C1 are turned around and soldered to three projected parts 20 located at the peripheral part of the printed circuit board 16A. Consequently, a simple circuit structure can be obtained by preventing an overlapped part in the circuit pattern with almost no fear of noises and malfunctions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small three-phase motor in which a stator is provided with a three-phase winding and a printed circuit board provided with a drive circuit for the three-phase winding is fixed to the stator. It is a thing.

[0002]

2. Description of the Related Art A small three-phase motor is known in which a stator is provided with a three-phase winding and a printed wiring board provided with a drive circuit for the three-phase winding is fixed to the stator. For example, in a brushless motor, a circuit for detecting the rotation angle of a permanent magnet type rotor by a hall element or a rotary encoder and switching each current of the stator winding in accordance with this rotation angle. That is, there is one in which a drive circuit is provided on this printed wiring board.

FIG. 4 is an exploded perspective view of a stator of this conventional brushless motor, and FIG. 5 is a connection circuit diagram of a stator winding. This stator 10 has six poles 12a to f, and stator windings 14a to 14f are wound around the respective poles 12a to 12f. The pair of opposing poles are connected in series as shown in FIG. 5, and both ends of this series circuit are connected to A ₁ and A ₂ , B _1.
And B ₂ , C ₁ and C ₂ .

Reference numeral 16 denotes a printed wiring board, which is the stator 10.
Fixed on one side. For example, a pin (not shown) is integrally provided on the insulating material around which the stator winding 14 is wound, and the printed wiring board 16 is adhesively fixed to this pin. A circular window 18 is provided at the center of the printed wiring board 16 for passing the shaft of a rotor (not shown).

Six protrusions 20 {20 (A ₁ ), 20 (A ₂ ), 20 (B) are provided on the outer peripheral edge of the printed wiring board 16.
₁ ), 20 (B ₂ ), 20 (C ₁ ), 20 (C ₂ )} are provided. A circuit pattern formed on the printed wiring board 16 extends on these protrusions 20, and the terminals A ₁ , A ₂ , B ₁ , B ₂ , C ₁ , C ₂ of the winding 14 are wound around the circuit pattern. After being attached, it is soldered.

Of the six protrusions 20, three protrusions 20
(A1) and 20 (B1) and 20 (C1) are connected to each other by a circuit pattern 22, and this circuit pattern 2
2 is the neutral point of each winding 14. Here, it is desirable that each protrusion 20 be provided at a position close to the windings 14a to 14f. Therefore, the protrusions 20 (A ₁ ) and 20 which are neutral points
It is desirable that (B ₁ ) and 20 (C ₁ ) are provided at intervals of about 120 °, and other protrusions 20 (A ₂ ), 20 (B ₂ ) and 2
It is desirable that 0 (C ₂ ) is dispersed and provided between them.

Reference numeral 24 is an IC, which incorporates the above-mentioned drive circuit. The neutral point and the non-neutral side winding end A of each winding 14.
₂ , B ₂ , and C ₂ are circuit patterns of the printed wiring board 16.
This IC2 is provided by the IC 22 and other circuit patterns 26.
4 is connected. A bridge circuit or the like for switching the current of the winding 14 is provided in the IC 24.

The IC 24 may be provided with a circuit for discriminating the rotation angle of the rotor from the voltage change of the winding 14 of each phase. Alternatively, the circuit for determining the rotation angle may be formed by another IC, and this IC may be provided on the printed wiring board 16. Further, the rotation angle of the rotor may be obtained by a hall element or the like.

[0009]

As described above, in the conventional device, the protrusions 20 (A ₁ ), 20 (B ₁ ), 20 (C) which are neutral points are formed.
₁ ) is the other protrusions 20 (A ₂ ), 20 (B ₂ ), 20
Since they are arranged alternately with (C ₂ ), the other protrusions 20 (A ₂ ), 20 (B ₂ ), 2
The 0 (C ₂ ) circuit pattern 26 crosses the printed wiring board 16.

Therefore, these two circuit patterns 22, 26
Needs to be separately formed on both sides of the printed wiring board 16, and another through-hole is required, which causes a problem that the number of manufacturing processes increases. It is also conceivable to stack both circuit patterns 22 and 26 on the same surface of the printed wiring board 16 with an insulating layer in between to form a so-called jumper wire structure. However, in this case, since the wirings are close to each other, signal line leakage occurs, which easily causes noise and causes malfunction. This phenomenon becomes a serious problem particularly when the rotation angle is detected from the voltage change between the windings 14 of each layer without using a hall element.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and eliminates the need for interlinking the circuit patterns of a printed wiring board fixed to a stator, simplifies the circuit structure, and causes malfunctions due to noise. It is an object of the present invention to provide a three-phase motor that can prevent the above.

[0012]

According to the present invention, the object is a three-phase motor in which a printed wiring board is attached to a stator having a three-phase winding, and a drive circuit for the stator winding is provided on the printed wiring board. In, a wiring pattern for connecting the neutral point of the stator winding is formed on the outer peripheral side of the printed wiring board, and the non-neutral point of the stator winding is connected to the inside of this wiring pattern. And a non-neutral side winding end of the stator winding is formed by penetrating the printed wiring board and soldered to the land, thereby achieving a three-phase motor. It

The winding end on the non-neutral point side can be soldered to the land through a hole penetrating the printed wiring board. Also, a slit is provided from the outer periphery of the wiring board on the protruding part around which the neutral point side winding end is wound, and by extending this slit to the land, the non-neutral point side winding end is inserted from the outer periphery of the wiring board into this slit. It may be soldered to the land.

[0014]

1 is an exploded perspective view of a stator which is an embodiment of the present invention. In this embodiment, the neutral point side winding ends A ₁ and B
It formed substantially along the outer periphery of the emission 22A printed wiring board 16A - circuit pattern connecting the _1, C _1. Also this circuit pattern - on the inside of the emission 22A, the non-neutral side winding end A _2, B _2, C
Three lands 30 for connecting ₂ were formed. The printed wiring board 16A is provided with through holes 32 penetrating these lands 30.

On the other hand, the stator 10A has poles 12a, 12
Pins 34 standing up near c and 12e are provided. These pins 34 are aligned with the holes 32.
These pins 34 each winding 14a to, 14c, one end or non-neutral side winding end of the _{14e A 1, B 1, C} 1 are connected.

Therefore, the hole 32 of this printed wiring board 16A
The pin 34 is inserted while being aligned, and the wiring board 16A is adhesively fixed to the stator 10A. And land 30 and pin 3
Solder 4 and. In addition, the neutral point side winding ends A ₂ , B ₂ ,
C ₂ is wound around the three projecting portions 20 provided on the outer periphery of the wiring board 16A and soldered. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will not be repeated.

FIG. 2 is an exploded perspective view of a stator of another embodiment,
FIG. 3 is a partially enlarged view thereof. In this embodiment, FIG.
A slit 36 is provided instead of the hole 32 in FIG.

That is, the neutral point side winding ends A ₁ , B ₁ , C ₁
20 (A ₁ ), 20 (B ₁ ), 20
The circuit pattern 22B is extended over the entire one surface of (C ₁ ) while the protrusions 20 (A ₁ ), 20 (B ₁ ), 20
A slit 36 is provided which penetrates (C ₁ ) in the radial direction and reaches the land 30. It is desirable to form a wedge-shaped notch 38 (see FIG. 3) at the tip of the slit 36 on the side of the land 30.

Therefore, the printed wiring board 16B is attached to the stator 10.
After fixing to the neutral point B, before winding the winding ends A ₁ , B ₁ , C ₁ on the neutral point side around the protrusions 20 (A ₁ ), 20 (B ₁ ), 20 (C ₁ ), The winding ends A ₂ , B ₂ , and C ₂ on the sex point side are grasped by fingers and inserted into the slits 36 from the outer circumference. Then, the winding ends A ₂ , B ₂ and C ₂ are locked in the wedge-shaped notches 38 and soldered. In FIG. 3, 40 indicates this solder.

After that, the neutral point side winding ends A ₁ , B ₁ and C ₁ are wound around the protrusions 20 (A ₁ ), 20 (B ₁ ), 20 (C ₁ ) and soldered. At this time, the protrusions 20 (A ₁ ) and 20
(B ₁ ) and 20 (C ₁ ) are divided by the slit 36, and the winding ends A ₁ , B ₁ , C ₁ wound around the slit 36 and the solder sandwich the slit 36, and both sides thereof are electrically connected. Will be connected to.

[0021]

As described above, according to the first aspect of the present invention, the circuit pattern for connecting the winding ends on the neutral point side is formed on the outer peripheral side of the printed wiring board, and the neutral point side circuit pattern is formed. Lands for connecting the non-neutral point side winding ends are provided inside the plugs, and the non-neutral point side winding ends are passed through the printed wiring board and soldered to these lands. Therefore, the circuit patterns do not cross each other, the circuit structure is simplified, and the productivity of the printed wiring board is improved. Moreover, noise is less likely to occur due to signal leakage between circuits, and malfunctions are less likely to occur.

Here, the non-neutral point side winding end can be passed through a through hole provided in the printed wiring board and soldered to the land (claim 2). In addition, a slit is provided that crosses the protrusion around which the neutral point side winding end is wound in the radial direction to reach the land, and the non-neutral point side winding end is inserted from this slit and soldered to the land. (Claim 3)

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of another embodiment.

[Fig. 3] Partly enlarged view

FIG. 4 is an exploded perspective view of a conventional device.

[Fig. 5] Wiring diagram of stator winding

[Explanation of symbols]

10, 10A, 10B Stator 14a-f Stator winding 16, 16A, 16B Printed wiring board 20 Projection parts 22, 22A, 22B Neutral point side circuit pattern 24 IC 26 as a drive circuit Non-neutral point side Circuit pattern 30 Land 32 Through hole 34 Pin 36 Slit A ₁ , B ₁ , C ₁ Neutral side winding end A ₂ , B ₂ , C ₂ Non-neutral side winding end

Claims (3)

[Claims] 1. A three-phase motor in which a printed wiring board is attached to a stator provided with a three-phase winding, and a drive circuit for the stator winding is provided on the printed wiring board. A wiring pattern for coupling the characteristic points is formed on the outer peripheral side of the printed wiring board, and a land for connecting a non-neutral point of the stator winding is formed inside the wiring pattern. A three-phase motor characterized in that a non-neutral-point side winding end of a stator winding is passed through the printed wiring board and soldered to the land. 2. The printed wiring board is formed with a through hole penetrating a land connecting a non-neutral point of the stator winding, and a non-neutral point side winding end of the stator winding is formed. The solder according to claim 1, which is soldered to the land through the through hole.
Phase motor. 3. A printed pattern on the outer peripheral edge of the printed wiring board, around which a neutral point side winding end of the stator winding is wound, the wiring pattern connecting the neutral point to the projected portion. On the other hand, the printed wiring board is formed with a slit extending in the radial direction across the wiring pattern of the protruding portion to reach the land, and the non-neutral side winding of the stator winding is formed. The three-phase motor according to claim 1, wherein the wire end can be soldered to the land through the slit.