JP2530602Y2 - Stator structure of brushless DC motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a brushless DC motor stator in which an armature coil is wound around a salient pole stator core made of a ferromagnetic material. In this stator, a terminal block for coil terminal processing having a plurality of terminal pins is attached to the stator core. Therefore, the winding of the armature coil around the stator core and the tying of the coil end can be performed in one step. Although the stator having such a structure is not particularly limited, it is useful, for example, for a spindle motor or the like in a magnetic disk drive.

[Conventional technology]

There is a structure in which a stator core of a salient pole structure made of a ferromagnetic material is used as a stator of a radial gap type brushless DC motor. An armature coil is wound around the salient pole portion of the stator core. In the case of a three-phase winding, the number of coil terminals is generally six, depending on the connection method. Therefore, each coil terminal must be surely sorted and connected to the circuit.

Due to the demand for miniaturization of equipment using a motor, space constraints on the stator have been increasing.
Therefore, a stator is directly fixed to a printed circuit board on which a motor drive circuit is mounted. for that purpose,
First, an armature coil is wound around the salient pole portion of the stator core, and then each coil terminal is temporarily fixed with an adhesive tape or the like. Then, the finished product is transferred to an assembly process and attached to a printed circuit board. After that, the coil terminals are temporarily removed and sorted so as to be correct, and then each coil terminal is routed to the corresponding connection pattern of the printed circuit board and directly soldered.

[Problems to be solved by the invention]

In the prior art, the step of winding the armature coil around the stator core and the step of connecting the coil terminals are completely different steps, and the movement of the wound-up product is required between them.
For this reason, the armature coil temporarily fixed becomes loose at the time of handling, and the winding-up dimension varies, and the coil ends are entangled with each other, making it difficult to handle. Further, due to these, the coating of the wire may be scratched or peeled off, or the wire may be broken, resulting in a decrease in yield and quality.
Further, when soldering the connection patterns to the coil terminals, they must be sorted out one by one, and the workability is poor.

The purpose of this invention is that the winding of the armature coil on the stator core and the terminal connection process can be performed in the same process, which improves workability, makes it easier to handle winding-up products, and reduces winding-up dimensions. An object of the present invention is to provide a brushless DC motor stator structure which is uniform and does not cause defects such as damage to insulation coating and disconnection.

[Means for solving the problem]

In order to solve such a problem, in the present invention, a terminal block for coil terminal processing is attached to a stator core, and each coil terminal is tied and soldered to its terminal pin.

This coil terminal processing terminal block has a structure in which, for example, a required number of terminal pins are planted on an insulating member. Actually, a locking projection is formed on the insulating member, a locking portion is formed on the stator core side, and the terminal block for coil terminal processing can be mounted on the stator core with one touch by a combination of the two. desirable. If the thickness of the insulating member is determined to be slightly larger than that in consideration of the winding-up dimension of the armature coil, it can also serve as a spacer when the stator is fixed to a printed circuit board or the like.

[Action]

In this invention, a terminal block for coil end processing is mounted on a stator core prior to winding of an armature coil. Then, it is mounted on a winding machine. In the winding machine, a required armature coil is wound around the salient pole portion of the stator core, and subsequently, the coil terminal is tied to a predetermined terminal pin and fixed.
After that, it is sent to the soldering process. When transferring the wound product, the coil end is already entangled with the terminal pin and fixed, so there is no loosening or loosening of the armature coil or its coil end, and damage to the insulation coating of the wire occurs No disconnection occurs.

In addition, since the winding of the armature coil around the stator core by the winding machine and the terminal entanglement process are performed at a stretch, it is troublesome to temporarily fix the winding as in the prior art and sort each coil terminal at the time of soldering. No more problems.

〔Example〕

FIG. 1 is a perspective view showing an example of a stator structure of the brushless DC motor according to the present invention. The stator has a radial gap structure in which an armature coil 2 is wound around a laminated or non-laminated stator core 1 made of a ferromagnetic material. The stator core 1 has a structure in which twelve salient pole portions are uniformly formed radially outside the ring-shaped portion 1a, and the armature coil 2 is wound around each salient pole portion. Here, the armature coil 2 is wound in three phases, and there are a total of six coil terminals.

Such a stator is mounted on a printed circuit board 3 on which a motor drive circuit is mounted. Although not shown, the rotor has a structure in which a ring-shaped permanent magnet is provided on the inner peripheral surface of the cup-shaped yoke, and the tip of the salient pole portion of the stator core 1 has a slight magnetic gap with the inner peripheral surface of the permanent magnet of the rotor. Are combined so as to face each other.

The feature of the present invention is that a connection processing structure of the coil terminal of the armature coil 3, particularly, a terminal block for processing the coil terminal is used. The details are shown in FIG. The coil terminal processing terminal block 4 has a ring-shaped base 4 a corresponding to the ring-shaped portion 1 a of the stator core 1. The thickness is set slightly larger than the height of the armature coil 2 protruding from the stator core bottom surface. A claw 5 which is a projection for engagement with the stator core 1 is integrally formed on the upper surface of the ring-shaped base 4a. This claw 5 is 120 ° with respect to the central axis.
A total of six parts are formed so as to face three symmetrical positions, two in each case. A total of six terminal pins 6 are planted on the outer side in the vicinity of the claws 5. The ring-shaped base portion 4a and the claw portion 5 are integrally molded products such as synthetic resin. In this embodiment, a screw insertion hole 7 is provided between two claw portions 5 arranged close to each other. On the other hand, a locking hole 8 is also formed in the ring-shaped portion 1 a of the stator core 1, and the end of the locking hole 8 is hooked on the tip of the claw portion 5. The locking hole 8 is formed so that the terminal pin 6 can be inserted with a margin.

FIG. 3 shows a state in which the coil terminal processing terminal block 4 is combined with the stator core 1. Terminal block for coil terminal processing 4
By pushing the claw 5 along the inner wall of the locking hole 8 of the stator core 1, the tip of the claw 5 is hooked on the upper end of the locking hole 8, so that it can be mounted with one touch. The terminal pins 6 protrude slightly upward through the locking holes 8. In this state, it is set on the winding machine. In the winding machine, an armature coil 2 is wound around a salient pole portion of a stator core 1, and a coil terminal 2 a of the armature coil 2 is fixed to a predetermined terminal pin 6. The finished product is discharged from the winding machine in this state. In actual assembling of the stator, the discharged wound product is transported to a soldering process to solder a coil terminal, and then a coil inspection is performed to mount it on the printed circuit board 3. The mounting of the stator can be performed by screws 9. The screw 9 is fastened to the printed circuit board 3 or a member located on the opposite surface thereof through a screw insertion hole formed in the ring-shaped portion 1a of the stator core 1 and a screw insertion hole 7 formed in the coil terminal processing terminal block 4. The state is shown in FIG. By making the height of the ring-shaped base portion 4a of the terminal block 4 for coil terminal processing slightly larger than the height of the armature coil 2 protruding from the bottom surface of the stator core 1, the terminal block 4 for coil terminal processing can be fixed to the stator. It functions as a spacer for mounting.

The structure of the terminal block for coil terminal processing is not limited to that shown in FIG. The number of terminal pins to be implanted here is not limited to six, and is determined according to the motor driving method, the coil connection method, and the like. In addition, the number of protrusions for locking is not limited to three, but may be two or four or more. Further, the shape of the stator core is not limited to the above-described one.

[Effect of the invention]

As described above, in the present invention, the terminal block for coil terminal processing is attached to the stator core, so that following the armature coil winding around the salient pole portion of the stator core, the coil terminal is entangled with the terminal pin in the same process and fixed. This makes it easier to handle the finished product and prevents the winding from becoming loose or loose when it is transferred to another process.
For this reason, the winding up dimension is made uniform. In addition, there is no possibility that the insulating coating of the wire is damaged or broken, and the yield can be improved and the quality can be stabilized.

Further, in the present invention, since the coil terminal can be tied up in the same process as described above, the coil terminal is temporarily fixed with an adhesive tape or the like after winding as in the prior art, or it is removed for soldering. Therefore, it is not necessary to sort the coil terminals, and the number of work steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a stator structure of a brushless DC motor according to the present invention, FIG. 2 is a perspective view showing an example of a terminal block for coil terminal processing used therein, and FIG. 3 is an assembly of the present invention. FIG. 4 is an enlarged perspective view showing an example of the state, and FIG. 4 is a longitudinal sectional view. 1 ... stator core, 2 ... armature coil, 3 ...
... Printed circuit board, 4 ... Terminal block for coil terminal processing, 5 ...
... claw portions, 6 ... terminal pins, 8 ... locking holes.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-150653 (JP, A) JP-A-62-182069 (JP, U) JP-A-58-143456 (JP, U) JP-A-61-156456 169470 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A coil terminal processing terminal block having a plurality of terminal pins and also serving as a spacer is attached to a stator core made of a ferromagnetic material, and an armature coil is wound around a salient pole portion of the stator core. In a brushless DC motor stator entangled with the terminal pins and soldered, the stator core includes a ring-shaped portion having a plurality of arc-shaped locking holes, and a number of salient pole portions projecting from the ring-shaped portion. The terminal block for coil terminal processing has a ring-shaped base portion having a shape corresponding to the ring-shaped portion of the stator core, and a plurality of claw portions serving as locking projections. A plurality of portions are erected from the ring-shaped portion so as to face each other at a plurality of positions symmetrically with respect to the central axis, and each of the terminals is provided outside the vicinity of each claw portion, and each of the terminals is provided in a circle of the stator core. Brushless that allows the terminal block for coil end processing to be attached to the stator core with one touch by combining the end of the hook-shaped locking hole with the tip of the claw and the terminal pin to enter the arc-shaped locking hole with a margin. DC motor stator structure.