JPH0622484A - Motor stator - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size of the printed circuit board and to reduce the material cost by increasing the degree of freedom in the design of the printed circuit board without breaking or damaging the lead wire of the winding wire during molding of the resin. In a stator of a motor, a printed circuit board 5 for connecting an annular stator core 1 in which a plurality of stator windings 4 are provided via an insulating layer 2 and one end 4a of the plurality of stator windings 4
And the other end 4b of the plurality of stator windings are collectively connected to one end which is not connected to the printed circuit board 5 to form the neutral point connection 9 and the neutral point connection 9 is formed of an insulator. Stopper 1
Then, the stopper 10 is fixed to the stator core 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a motor having a stator core provided with a plurality of stator windings.

[0002]

2. Description of the Related Art Conventionally, as a winding method of a motor such as a brushless motor in which a plurality of stator windings are applied to a stator core, a method of winding a winding for each tooth portion of the stator core is often adopted. As a method of connecting these windings, a method of connecting both ends of the windings to a printed circuit board attached to the stator has been widely adopted.

FIG. 5 is a perspective view of a conventional brushless motor in a stator assembled state, and FIGS. 6A and 6B show a conventional three-phase 6
The top view of the stator winding of a salient pole and a printed circuit board is shown, respectively.

In FIGS. 5 and 6, the stator core 1 is provided with the stator winding 4 on the tooth portion 3 via the insulating layer 2. On the other hand, the printed circuit board 5b is formed in a substantially donut shape, and when the printed circuit board 5 is mounted on the wound stator core 1, the printed circuit board 5b is fixed at a position where it does not come into contact with or interfere with the stator winding 4 or the insulating layer 2. Has been done. Also, the printed circuit board 5
A lead wire group 6 for power supply or speed detection is also attached to b, and a lead bush 7 for protecting the lead wire group 6 from heat and pressure during resin molding is fixed to the lead wire group 6, In order to connect the stator winding and the printed circuit board 5b, winding wire connecting protrusions 8a and 8b are provided. The stator magnetic poles are wound on the tooth portions 3 facing each other for each phase to form two salient poles. Then, one end 4a of the lead wire of the winding for each phase is connected by using the winding connection protrusion 8a of the printed circuit board 5b which is wired so as to be connected to the output terminal of the drive circuit. The other end 4b of the lead wire of the stator winding 4 is connected to the winding connection protrusion 8b of the printed circuit board 5b which is wired so as to have the same potential as the neutral point connection. In the stator having such a configuration, if the distance between each winding wire connecting protrusion and each tooth portion becomes long, the winding wire also becomes long and interferes with the mold at the time of thermosetting resin molding so that the winding wire may be disconnected or Since there is a risk of damage, each winding wire connection protrusion is provided near each tooth.

[0005]

However, in the above configuration, since the wiring is so formed as to have the same potential as the neutral point connection on the printed circuit board, a space for the wiring is required, and that much space is required. The printed circuit board cannot be used effectively.

Further, even if the area of the printed circuit board is reduced for reasons such as rationalization of the drive circuit, it is necessary to provide the winding wire connecting protrusions near the teeth, which increases the area of the printed circuit board. Material cost is high. If the printed circuit board is made smaller, the distance from the teeth to the winding wire connection part of the printed circuit board will be longer, and the lead wire of the winding will also be longer, which will interfere with the mold during molding resin molding. Had a problem of being easily broken or damaged.

The present invention is intended to solve the above-mentioned problems. The printed circuit board is miniaturized and the degree of freedom in designing the printed circuit board is increased without breaking or damaging the lead wire of the winding wire during molding of the molding resin. Then, the purpose is to reduce the material cost.

[0008]

In order to achieve the above object, a stator of a motor according to the present invention is configured such that one end of a lead wire of a winding formed for each phase is connected to an output terminal of a drive circuit. Connected to the winding wire connection protrusion of the printed circuit board that is wired to the other end, the other end of the lead wire of the winding of each phase should have the same potential as the neutral point connection, not through the printed circuit board. Directly to each other, and the part that is directly connected to form a neutral point connection is inserted or sandwiched in the winding fixing part of the stopper formed of an insulator, and the stopper is fixed to the stator core. To configure.

[0009]

With the above construction, it is not necessary to provide a wiring space for neutral point connection on the printed circuit board, and it is not necessary to provide a winding connection projecting portion near the tooth portion of the printed circuit board. The degree of freedom in shape design increases. Further, the portion connected as a neutral point connection is fixed by inserting or sandwiching it in the winding fixing portion of the stopper formed of an insulator,
In addition, since the winding is not in contact with the metal portion or the conductive portion of the stator by adopting the structure in which the stator iron core is attached with the stopper, there is no fear that the winding will be broken or damaged during molding with the molding resin. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor stator according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a stator assembled state of a brushless motor of the present invention, FIG. 2 (a) shows a stator winding, and FIG. 2 (b) shows a printed circuit board.

In FIGS. 2A and 2B, the stator core 1 has a stator winding 4 wound around a tooth portion 3 with an insulating layer 2 interposed therebetween. On the other hand, the printed circuit board 5 is formed in a substantially donut shape or a fan shape, and a lead wire group 6 for power supply or speed detection is attached to protect the lead wire group 6 from heat and pressure during resin molding. The lead-out bush 7 for fixing is fixed to the lead wire group 6. Further, in order to connect the stator winding 4 and the printed circuit board 5, a winding wire connecting protrusion 8a is provided.

The stator magnetic poles are wound on the tooth portions 3 facing each other for each phase to form two salient poles.
One ends of the stator windings 4 of each phase are directly connected to each other so as to have the same potential, and a neutral connection 9 is formed. Further, the stator core 1 is provided with a stopper 10 for fixing the neutral point connection 9 at a position where it does not come into contact with or interfere with the printed circuit board 5 or the stator winding 4.

In FIG. 1, one end 4a of the stator winding 4 constituting each phase is connected by using a winding connecting protrusion 8a of a printed circuit board 5 which is connected to an output terminal of a drive circuit. , The other end 4b of the stator winding 4 forms the neutral point connection 9 without the printed circuit board 5, and the stopper 10
Is inserted and fixed.

3 and 4 are perspective views showing an example of a stopper according to the embodiment of the present invention. The stopper 10 is made of an insulating material, and a single insulating layer 12 is provided between the insertion portion 11 for inserting the neutral point connection 9 and the stator core 1 so that the stator core 1 and the neutral point connection 9 The insulation is secured with. The insertion portion 11 into which the neutral point connection 9 is inserted may be hollow as shown in FIG. 3 or may be formed as a plurality of plate-like projections as shown in FIG. In this case, the plate-shaped projection 15 is provided with the winding fixing portion 13 to prevent the inserted neutral point connection 9 from falling off or loosening. This may be a notch 14 as shown in FIG. 3, or may be wrapped around the stopper 10 as shown in FIG. 4 or around a protrusion (not shown) provided on the stopper 10. If the winding fixing portion 13 is not provided, it may be fixed by using an adhesive.

[0016]

As apparent from the above description, according to the stator of the motor of the present invention, by directly connecting one end of the stator winding of each phase, the same potential can be obtained as a neutral point connection. Since the space on the printed circuit board required for the wiring can be used for other wiring, the printed circuit board can be effectively used.

Further, since it is not necessary to provide the winding wire connecting protrusions near the teeth, the area of the printed circuit board can be reduced, and the die for molding is formed to fix the winding wire to the insulating layer. And the winding will not be broken or damaged.

Further, the gathered portion connected as a neutral point connection is inserted or sandwiched in a winding fixing portion of a stopper formed of an insulator, and is fixed to the stator core with a stopper. As a result, it is possible to prevent a short circuit from coming close to the metal portion or the conductive portion of the stator.

As described above, according to the present invention, cost reduction and high reliability are realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembled state of a brushless motor stator of the present invention.

FIG. 2A is a plan view of a stator of the present invention. FIG. 2B is a plan view of a printed circuit board for connecting the stator of the present invention.

FIG. 3 is a perspective view showing an embodiment of a stopper of the present invention.

FIG. 4 is a perspective view showing another embodiment of the stopper of the present invention.

FIG. 5 is a perspective view showing an assembled state of a conventional brushless motor stator.

FIG. 6A is a plan view of a conventional stator. FIG. 6B is a plan view of a conventional stator connection printed circuit board.

[Explanation of symbols]

 1 Stator Core 2 Insulating Layer 3 Teeth 4 Stator Winding 4a One End of Stator Winding 4b The Other End of Stator Winding 5 Printed Circuit Board 10 Stopper 13 Winding Fixing Part

Claims (1)

[Claims] 1. A plurality of stator windings are provided through an insulating layer to form an annular stator core, and a printed circuit board for connecting one end of a lead wire of the plurality of stator windings. One end of the stator winding that is not connected to the printed circuit board is connected together with the lead wire, and the connection part of the lead wires that are connected together is fixed to the winding fixing part of the stopper formed of an insulator. A stator of a motor having the stopper fixed to the stator core.