JPS6225858A - Surface opposite type brushless motor - Google Patents

Abstract

PURPOSE:To increase torque, and to manufacture the titled brushless motor at low cost by forming a stator core for a stator section oppositely faced to a rotor magnet for a rotor section in a core with a collar. CONSTITUTION:A surface opposite type brushless motor consists of a stator section A and a rotor section B. In the stator section A, a winding coil 1 is wound on a core 2 with a collar, and the winding coil 1 wound is fixed at the predetermined position of a stator yoke 3. In the rotor section B, a rotor yoke 4 is bonded with a rotor magnet 5 on the inside thereof. The rotor yoke 4 is fastened to a shaft 8, and the shaft 8 is pressed into a bearing 7 fixed into a housing 6. A Hall-element mounting substrate 10 fastening a Hall element 11 for detecting the position of a magnetic pole for the rotor magnet 5 is arranged near the winding coil 1 wound on the core 2 with the collar. A FG pattern substrate 13 is disposed to the circumferential section of the stator section A.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a brushless motor, and more particularly, to a brushless motor in which a stator part and a rotor part are arranged on the same axis, which can be applied to optical systems and process drives of copying machines, etc. This invention relates to an opposed brushless motor.

[Prior art]

Conventionally, brushless motors have torque that is proportional to the amount of current, and because there are no brushes, there is no noise caused by sparks, and
It is used in various fields because it has low noise because it does not generate brush sliding noise, and has a long life. A surface-facing brushless morph, which is an improved thinner version of the brushless morph, has been realized, but there are many demands for improvement in such surface-facing brushless motors in terms of magnetic circuit efficiency, high torque, and low cost. There is.

〔the purpose〕

An object of the present invention is to provide a surface-facing brushless motor that can achieve high torque and be manufactured at low cost.

〔composition〕

In order to achieve the above object, the present invention provides a surface facing brushless motor in which a stator part and a rotor part are arranged on the same axis, in which the stator core of the stator part facing the rotor magnet of the rotor part is a core with a flange. It is characterized by this.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

FIG. 1 shows a cross-sectional view of an embodiment of a surface-facing brushless motor according to the present invention, and in the figure, the surface-facing brushless motor is generally shown divided into two parts, a stator section A and a rotor section B. .

In the stator section A, 1 indicates a winding coil, and this winding coil 1 is wound around a core 2 with a collar. The winding coil 1 wound around the flanged core 2 is connected to the stator yoke 3.
is fixed in place.

In the rotor portion B, the rotor yoke 4 has a rotor magnet 5 bonded therein. The rotor yoke 4 is the shaft 8
The shaft 8 is press-fitted into a bearing 7 fixed within the housing 6. The housing 6 fixes the bearing 7 with the stator yoke 3 and the spacer 16 interposed therebetween. A retaining ring 17 for the hole and a retaining ring 18 for the shaft are provided at both ends of the bearing 7, and play in the axial direction is controlled by these. A rotor fixing ring 9 is press-fitted into the shaft 8, and the rotor fixing ring 9 fixes the rotor yoke 4 to the shaft 8 via a set screw 19. A Hall element 11 for detecting the magnetic pole position of the rotor magnet 5 is located near the winding coil 1 which is wound once around the flanged core 2.
A board 10 is placed for mounting the Hall element to fix the .

A frequency generator (FC) pattern board 13 is disposed around the stator part A, and a rotor part B facing the FC pattern board 13 is provided with a frequency generator (FC) magnet 12 and a magnet 12 for the FG. Frequency generator (F
G) Magnet yoke 14 is arranged. A blocking ring 15 is provided on the outside of the FG magnet 12 and the FC magnet yoke 14, and the blocking ring 15 prevents the magnetic field from the rotor magnet 5.

As can be seen from FIG. 1, there is a considerable distance between the rotor magnet 5 and the stator yoke 3. Therefore, in order to make the magnetic circuit of this motor efficient, the assistance of the flanged core 2 is necessary. Due to this flanged core 2, the distance (gap) between the stator cork 3 and the rotor magnet 5 is extremely small (0.5 mm in this embodiment). Also, of course, since this flanged core 2 has a flang,
The flange collects as much of the magnetic flux of the rotor magnet 5 as possible, and therefore the flange of the flange core 2 functions to converge the magnetic flux of the rotor magnet 5. Since the cross-sectional area of the flanged core 2 in the part where the winding coil 1 is wound has an area of such an extent that the core 2 is not saturated with magnetic flux, the winding coil 1 is a part that does not contribute to torque generation. That is, the length in the circumferential direction can be made as small as possible. This reduces the armature resistance of the motor, leading to very good motor characteristics.

FIG. 2 is a plan view of the surface-facing brushless motor shown in FIG. 1, viewed from the stator section A side. Similarly to FIG. 1, 1 is a winding coil, 2 is a core with a collar, 6 is a housing, and 9 is a rotor fixing ring, 10 is a Hall element mounting board, 11
1 is a Hall element, and 13 is an FG pattern substrate.

In order to inexpensively manufacture a surface-facing brushless motor as in the present invention, it depends on how inexpensively the stator section A described above can be manufactured.

In particular, the cost of the entire motor is determined by how inexpensively the flanged core 2 and the winding coil 1 are manufactured.

In this embodiment having the above configuration, the flanged core 2
The cost of the entire motor is determined by how inexpensively it can be manufactured.

FIGS. 3(a) to 3(f) show examples of flanged cores 2 manufactured by various methods.

In the drawings, FIGS. 3(a) to 3(d) show a plan view, a front view, and a side view of the structure in which the flanged core 2 is made into a sheet metal part, and FIGS. 3(C) and 3(d) show the front view. The x marks in the figure indicate spot welded parts. Figure 3 Cl5) and (
f) is an example in which the flanged core 2 is made into a molded part by sintering, drawing, casting, etc., and FIG. 3(6) is a plan view and a front view, and FIG. 3(f) is a plan view, Shown in front and side views.

Here, to summarize the preferred configuration of this embodiment, in the surface-facing brushless motor in which the stator section A and the rotor section B are arranged on the same shaft 8, the stator section A is opposed to the rotor magnet 5 of the rotor section B. The stator core is a flanged core 2, the rotor magnet 5 is bonded to the rotor yoke 4, the flanged core 2 is inserted into the winding coil 1 and fixed at a predetermined position on the stator yoke 3, and the stator yoke 3 is attached to the bearing 7. A shaft 8 is press-fitted into the bearing 7, and a rotor fixing ring 9 for fixing the rotor yoke 4 is integrally fixed to the shaft 8. Place the FG magnet 12 at a predetermined position on the stator yoke 3.
It is constructed by fixing a C pattern substrate 13. In this configuration, the flanged core 2 is constructed from a sheet metal part or a molded part, such as by sintering, drawing, casting, etc.

According to the embodiment described above, by configuring the winding coil using a flanged core, it is possible to increase the magnetic flux density of the gap, reduce the armature resistance, and realize a motor that can produce high torque. I can do it. Furthermore, the cost of the motor can be reduced by making the flanged core into a sheet metal part or into a molded part by sintering, drawing, casting, or the like.

〔effect〕

According to the present invention, by using a flanged core as the stator core, it is possible to increase the magnetic flux density in the gap, reduce armature resistance, and achieve high torque. Since the entire motor can be manufactured at low cost by forming it into a molded or molded part, it is possible to provide a surface-facing brushless morph that has the effect that the entire motor can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the surface-facing brushless morph according to the present invention, FIG. 2 is a plan view of the surface-facing brushless morph shown in FIG. 1, and FIGS. FIG. 3 is an explanatory diagram showing various embodiments of a flanged core used in a surface-facing brushless motor according to the invention. A... Stator part, B... Rotor part, 1... Winding coil, 2... Core with collar, 3... Stator yoke, 4... Rotor yoke, 5... Rotor machining net , 6... Housing, 7... Bearing, 8...
Shaft, 9... Rotor fixing ring, L2... Magnet for frequency generator (FC), 13... Frequency generator (F
G) Patterned substrate. Procedural amendment (voluntary) September 26, 1985

Claims (5)

[Claims] (1) A surface facing type brushless motor in which a stator part and a rotor part are disposed on the same axis, characterized in that the stator core of the stator part facing the rotor magnet of the rotor part is a core with a flange. brushless motor. (2) The rotor magnet is bonded to the rotor yoke, and the flanged core is inserted into a winding coil and fixed at a predetermined position on the stator yoke. Surface-facing brushless motor. (3) The stator yoke is fixed in a housing in which a bearing is fixed, the shaft is press-fitted into the bearing, and a rotor fixing ring for fixing the rotor yoke is integrally fixed to the shaft. A surface-facing brushless motor according to claim (2). (4) The surface facing device according to claim (2), characterized in that a frequency generator magnet is fixed to a predetermined position of the rotor yoke, and a frequency generator pattern board is fixed to a predetermined position of the stator yoke. type brushless motor. (5) The flanged core is a sheet metal part, sintered, drawn,
A surface-facing brushless motor according to claim 1, characterized in that it is constructed from a cast molded part or the like.