JP3367612B2 - 3 phase motor - Google Patents

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 connected to 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 connected to the three-phase winding is fixed to the stator. For example, in the brushless motor, the rotation angle of the permanent magnet type rotor detected by the Hall element or a rotary encoder, a circuit or a driving circuit for switching the current in the stator windings in response to the rotation angle, the printed wiring There is one provided on the board.

FIG. 3 is an exploded perspective view of a stator of a conventional brushless motor, and FIG. 4 is a connection circuit diagram of a stator winding. The stator 10 has six poles 12 (12a to 12f), and each of the poles 12a to 12f has a stator winding 14a to 14f.
Is wrapped around. A pair of opposing poles are connected in series as shown in FIG. 4, and both ends of this series circuit are designated as 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.
It is fixed on one side. For example, a pin (not shown) is integrally provided on an 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 in the center of the printed wiring board 16 for passing the shaft of a rotor (not shown).

Six protrusions 20 {20A ₁ , 20A ₂ , 20B ₁ , 20B ₂ , are provided on the outer peripheral edge of the printed wiring board 16.
20C ₁ , 20C ₂ } are provided. These protrusions 2
0 is a circuit pattern formed on the printed wiring board 16
(Wiring pattern) extends, and the windings 14a to 1 are provided here.
The terminal portions A ₁ , A ₂ , B ₁ , B ₂ , C ₁ , C _{2 of} 4f are wound and then soldered.

Of the six protrusions 20, three protrusions 20
A ₁ and 20B ₁ and 20C ₁ are circuit patterns (wiring patterns).
22 ) , and the circuit pattern 22 serves as a 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. For this reason, the projecting groups 20A ₁ and 20B ₁ , which are neutral points,
20C ₁ is preferably provided at intervals of about 120 °, and the other protrusions 20A ₂ , 20B ₂ and 20C ₂ are preferably provided dispersedly between them.

Reference numeral 24 denotes an IC, which incorporates the above-mentioned drive circuit. The neutral point and the non-neutral side winding end portions A ₂ , B ₂ and C _{2 of the} respective windings 14a to 14f are the circuit pattern 22 of the printed wiring board 16 and other circuit patterns (wiring patterns).
It is connected to this IC 24 by 26. This IC
A bridge circuit and the like for switching the current of the winding wire 14 are provided in 24.

The IC 24 includes windings 14a-1 for each phase.
A circuit for determining the rotation angle of the rotor from the voltage change of 4f may be provided. Further, the circuit for discriminating 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 apparatus, the protrusions 20A ₁ , 20B ₁ and 20C ₁ which are neutral points are alternately arranged with the other protrusions 20A ₂ , 20B ₂ and 20C _2. Since the neutral circuit pattern 22 has another protrusion 20A
The circuit patterns 26 of ₂ , 20B ₂ and 20C ₂ cross on the printed wiring board 16.

Therefore, both circuit patterns 22 and 26 are formed.
Needs to be separately formed on both surfaces of the printed wiring board 16, and another through hole is required, which causes a problem of increasing the number of manufacturing processes. It is also conceivable that both circuit patterns 22 and 26 are superposed on the same surface of the printed wiring board 16 with an insulating layer interposed therebetween to form a so-called jumper wire structure. However, in this case, since the wirings are close to each other, signal leakage between lines occurs, which easily causes noise and causes malfunction. This phenomenon is caused by the fact that the windings 14a ...
This is a big problem when detecting the rotation angle from the voltage change between 14f.

[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 produces a printed wiring board. It is an object of the present invention to provide a three-phase motor capable of improving the performance and preventing malfunction due to noise.

[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 three-phase windings, and a drive circuit connected to the stator windings is provided on the printed wiring board. In, the wiring pattern for coupling the neutral point of the stator winding is formed on the outer peripheral side of the printed wiring board, and the land for connecting the non-neutral point of the stator winding inside the wiring pattern. Forming a protrusion around the neutral point side winding end of the stator winding, the wiring pattern connecting the neutral point to the protrusion. On the other hand, the printed wiring board is formed with a slit that crosses the wiring pattern of the protrusion in the radial direction and reaches the land, and the non-neutral side winding end portion of the stator winding is formed. The run through the slit
In extending out the slit in the protrusion portion with soldered to de
Neutral point side winding with divided wiring pattern wound around the protrusion
A three-phase motor characterized by being electrically connected at the wire ends .

In this case, at the tip of the slit on the land side,
Make a wedge-shaped notch, and make a non-neutral side winding on this notch.
If the wire ends can be locked, the workability of soldering will be improved.
Suitable for above.

[0014]

1 is an exploded perspective view of a stator according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. In this embodiment, a slit 36 is provided from the projecting end of the printed circuit board 16B to the land 30, and a non-neutral side winding end is put in this slit 36 and soldered to the land.

In this embodiment, the neutral point side winding end portions A ₁ , B ₁ ,
The circuit pattern 22B for connecting C ₁ is printed wiring board 16
It is formed almost along the outer circumference of B. Further, inside the circuit pattern 22B, the non-neutral point side winding end portions A ₂ , B ₂ ,
Three lands 30 (30A, 30) for connecting C ₂
B, 30C) are formed. Then, the protrusions 20A ₁ , 20B _{1 around which} the neutral point side winding end portions A ₁ , B ₁ , C ₁ are wound,
The circuit pattern 22B is extended over the entire surface of one side of the 20C ₁ , while the slit 36 (36 extending to the land 30 through the protrusions 20A ₁ , 20B ₁ , 20C ₁ in the radial direction).
A, 36B, 36C) are provided. This slit 36
By forming a wedge-shaped notch 38 (see FIG. 2) at the tip on the side of the land 30, the holding of the winding end portion becomes easy.

The printed wiring board 16B is attached to the stator 10.
After being fixed to B, before winding the winding end portions A ₁ , B ₁ and C ₁ on the neutral point side around the protruding portions 20A ₁ , 20B ₁ and 20C ₁ , the non-neutral point side winding end portion A ₂ , B ₂ and C ₂ are inserted into the slit 36 from the outer circumference. Then, the winding ends A ₂ , B ₂ and C ₂ are locked in the wedge-shaped notches 38 for soldering. 4 in FIG.
0 indicates this solder.

After that, the neutral point side winding end portions A ₁ , B ₁ , C ₁
Is wound around the protruding portions 20A ₁ , 20B ₁ and 20C ₁ and soldered. At this time, the projecting portions 20A ₁ , 20B ₁ and 20C ₁ are divided by the slit 36, but by winding the winding ends A ₁ , B ₁ and C ₁ wound around here, the slit 36 is sandwiched between them. Both sides will be electrically connected.

[0018]

[Effect of the Invention] The invention of claim 1, as described above, purine
A protrusion winding the neutral point side winding end on the outer peripheral edge of the bets wiring board formed, since is provided with a slit extending in across these protrusion radially land, neutral side Winding end
Before winding the part around the protrusion, insert the non-neutral side winding end from this slit and solder it to the land, then wind the neutral side winding end around the protrusion and solder. You can attach
Growls Therefore , the circuit pattern on the printed wiring board
In交鎖Ri Do <br/> to be formed on only one surface without having to, the circuit configuration is simplified, productivity of the printed wiring board is improved. Further, there is an effect that noise is less likely to occur due to signal leakage between circuits, and malfunction is less likely to occur.

[0019] According to the invention of claim 2, the land of the slit
Since a wedge-shaped notch is provided at the tip of the side, the non-neutral side
The end of the winding can be locked in this notch and soldered
Therefore, the assembling workability is improved.

[Brief description of drawings]

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

[Fig. 2] Partly enlarged view

FIG. 3 is an exploded perspective view of a conventional device.

[Fig. 4] Wiring diagram of stator winding

[Explanation of symbols]

10, 10B Stators 14a to f Stator windings 16 and 16B Printed wiring board 20 Projections 22 and 22B Neutral point side circuit pattern (wiring pattern) 24 IC as a drive circuit 26 Non-neutral point side circuit pattern (wiring Pattern) 30 Land 36 Slit 38 Wedge-shaped notch A ₁ , B ₁ , C ₁ Neutral point side winding end A ₂ , B ₂ , C ₂ Non-neutral point side winding end

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-53-23001 (JP, A) JP-A-6-22484 (JP, A) JP-A-5-56595 (JP, A) Actual Kaihei 1- 71951 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 3/52

Claims (2)

(57) [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 connected to the stator winding is provided on the printed wiring board, wherein A wiring pattern for connecting the neutral 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 projecting portion around which a neutral point side winding end of the stator winding is wound is formed on an outer peripheral edge, and a wiring pattern for coupling the neutral point is extended to the projecting portion while the printed wiring board is formed. A slit is formed on the plate so as to cross the wiring pattern of the protruding portion in the radial direction and reach the land, and the non-neutral side winding end portion of the stator winding is formed with the slit.
Pass it through and solder it to the land and extend it to the protrusion.
Take out the wiring pattern divided by the slit on the protrusion
A three-phase motor characterized in that it is electrically connected at the winding end of the wound neutral point side . 2. A wedge-shaped tip at the land side of the slit.
The three-phase motor according to claim 1, wherein a notch is formed.