JPH02294253A - Surface-to-surface type motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a surface-opposed electric motor that is a disk rotation drive source in a drive device for a fixed disk or frossopy disk used as an external storage device in information equipment. .

Conventional technologyIn recent years, fixed disks. As storage devices such as floppy disks become smaller, thinner, and more energy efficient, electric motors used as rotational drive sources are also becoming more and more popular. Various improvements have been made in terms of performance and construction methods.

An example of the above-mentioned conventional surface-facing electric motor will be described below with reference to the drawings.

FIG. 4 is an example of a cross-sectional view of a conventional surface-facing electric motor. In FIG. 4, the conventional surface-facing electric motor has a bearing portion 9.
A rotor yoke 2 having an annular multipolar rotor magnet 1 attached to its inner circumferential surface is fixed to a rotary shaft 8 rotatably supported by a rotor 8 via a hub 7 to form a rotor section. On the other hand, the nutator section includes a bearing unit 6 containing a bearing section 9, and a stator coil arranged in a petal shape around the bearing unit 6).
3 *Flexible printed circuit board 4 forming the circuit section and stator coil/
It consists of a stator yaw cutout 10 to which L/3 is fixed. Further, on the upper part of the flexible printed circuit board 4, circuit components such as a Hall element for driving the electric motor are arranged.

Problems to be Solved by the Invention However, the above configuration requires a regulating jig or the like in order to precisely arrange the stator coils in a petal shape during assembly, which poses a problem in that it takes time and effort to assemble the stator coils. was there. Furthermore, since the electric motor has a surface-facing structure, it has the disadvantage that it is less efficient in terms of motor characteristics than a circumferentially-facing structure.

Means for Solving the Problems In order to solve the above problems, the present invention provides an iron core having the same shape as the air core of the stator coil, which fits into the air core of the inner circumference of the stator coil.

Moreover, as a second invention, the outside of the stator coil is positioned by a magnetic frame made of a magnetic material.

According to the present invention, the stator coil can be easily positioned simply by fitting the iron core into the air core of the stator coil, and furthermore, since the iron core is inside the coil,
It is possible to improve the magnetic characteristics and improve the efficiency of the motor characteristics.

Similarly, in the second invention, by wrapping the outside of the stator coil with a magnetic frame, it is possible to improve the magnetic characteristics and improve the efficiency of the motor characteristics.

EXAMPLE Hereinafter, a surface-facing electric motor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of an electric motor in a first embodiment of the present invention.

In FIG. 1, a rotor yoke 2 having an annular multipolar rotor magnet 1 attached to its inner circumferential surface is fixed to a rotating shaft 8 rotatably supported by a bearing 9 via a hub 7, and the rotor section is assembled. It consists of

On the other hand, the bearing unit 6. which accommodates the bearing part 9. A petal-shaped iron core 11 is attached to the nutator yoke 10 by a method such as caulking, with the bearing unit 6 as the center. Further, a stator coil/L/3 is arranged to surround the iron core 11, and is connected to a flexible printed circuit board 4 forming a circuit section. Further, a phase switching sensor 6 such as a Hole I element is mounted near the stator coil to form a stator section.

Note that the iron core 11 is formed in a shape that substantially corresponds to the shape of the air core portion on the inner periphery of the stator coil 3 .

FIG. 2 is a diagram showing the process of attaching the stator coil 3 to the iron core 11 coupled to the stator yoke 1o and the flexible printed circuit board 4.

As described above, according to this embodiment, unlike conventional surface-facing motors, it is difficult to accurately arrange the stator coils in a petal shape, and efficiency is improved from the viewpoint of motor characteristics that tend to occur in surface-facing motors. It is possible to solve the problem of a decrease in the motor speed, enable highly accurate positioning of the stator coil, and improve the efficiency of motor characteristics.

Next, a second embodiment of the present invention will be described.

FIG. 3 is an example of a configuration diagram of an electric motor in a second embodiment of the present invention.

In FIG. 3, a rotor yoke 2 having an annular multi-pole rotor magnet 1 attached to its inner circumferential surface is fixed to a rotating shaft 8 which is rotatably supported by a bearing 9 via a hub 7. It consists of

The nutator yoke 10 constituting the stator section includes:
A magnetic frame 12 made of a magnetic material such as iron is caulked to the stator yoke 1o in a petal shape around the bearing unit 6.
It is assembled using a method such as a pin, and the stator coil 3 is positioned inside the magnetic frame. The magnetic frame 12 is formed to have the same shape as the outer periphery of the stator coil/I/3.

As described above, according to the present embodiment, similar to the first embodiment, there are problems in that it is difficult to accurately arrange the stator coils in a petal shape, and there is a problem in efficiency from the viewpoint of motor characteristics that tend to occur in surface-facing motors. It is possible to solve the problem of lowering the stator coil, to enable highly accurate positioning of the stator coil, and to improve the efficiency of the motor characteristics.

Effects of the Invention As described above, according to the first aspect of the present invention, by fitting the iron core into the air core part of the stator coil, the stator coil can be easily positioned. The efficiency of the motor characteristics can be improved by adding the core.

Further, in the second aspect of the present invention, by wrapping the outside of the stator coil with a magnetic frame, it is possible to improve the magnetic characteristics and improve the efficiency of the motor characteristics.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an electric motor according to a first embodiment of the present invention, and FIG. 2 is a diagram showing the process of attaching a stator coil to an iron core integrally combined with a nutator yoke in the same embodiment. FIG. 3 is a partially cutaway perspective view of an electric motor according to a second embodiment of the present invention, and FIG. 4 is a partially cutaway perspective view of a conventional electric motor. 1...Rotor magnet, 3...Stator coil, 10...Stator yoke, 11...
...Iron core, 12...Magnetic frame. Name of agent: Patent attorney Shigetaka Awano and 1 other person/-
-1 Rotor magnet J1--Steggoil U-Da cliff stone IO-Shuta yoke +2 --- EAa *

Claims (2)

[Claims] (1) Consisting of an annular rotor magnet, a plurality of stator coils fixed at a position facing the rotor magnet, and a stator yoke supporting the stator coil,
A surface facing type characterized in that the stator yoke is provided with an iron core having the same shape as the air core of the stator coil that fits into the air core of the inner circumference of the stator coil and regulates the position of the stator coil at a predetermined position. Electric motor. (2) Consisting of an annular rotor magnet, a plurality of stator coils fixed at a position facing the rotor magnet, and a stator yoke supporting the stator coil, the stator yoke includes an outer circumference of the stator coil. 1. A surface facing type electric motor, comprising: a magnetic frame made of a magnetic material that fits into the stator coil and restricts the stator coil in a predetermined position.