JPH01190256A - 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 the Invention The present invention relates to a motor used in video and audio equipment such as video tape recorders and audio cassette tape recorders.

BACKGROUND OF THE INVENTION In recent years, motors used in video and audio equipment have been required to be smaller and thinner as devices become smaller.

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

As a conventional motor, for example, there is a motor shown in FIG.

FIG. 4 is a side sectional view of a conventional example. In the figure, this motor 1 has an annular permanent magnet 5 magnetized to a plurality of predetermined poles on a first plane part 2, which faces the first plane part 2 with a predetermined gap. , a plurality of phase stator windings 7 provided on a stator flat plate 6 made of a magnetic material and having an electric wiring section. The permanent magnet 5 is attached to the back yoke 4 made of a magnetic material and the second flat part 3 of the permanent magnet 5 is attached to the back yoke 4 made of a magnetic material.
The motor shaft 9 rotates integrally with the motor shaft 9. The motor shaft 9 is rotatably supported by a bearing attached to a motor board 10, which is tightly fitted to the member 1.

Problems to be Solved by the Invention However, with the above configuration, in order to obtain the required rotational torque, it is necessary to use a coil made of conductive wire wound several times, and there is a problem in that there is a limit to how thin the motor can be made. had.

In view of the above problems, the present invention provides a motor that can be made ultra-thin.

Means for Solving the Problems In order to solve the above problems, the motor of the present invention includes a motor shaft, which rotates integrally with the motor shaft, and has a first plane portion magnetized with a predetermined number of poles. , a rotor including an annular or disc-shaped permanent magnet with a back yoke made of a magnetic material arranged on a second plane part, and a rotor made of a superconducting material facing the first plane part of the rotor. The present invention includes a stator having a stator winding provided on a circuit board, and a bearing member for rotatably and slidably supporting the motor shaft.

Effect of the Invention With the above-described configuration, the stator winding can be directly provided on the circuit board in the same way as printed wiring, so there is no need to wind the conductor wires many times, and an ultra-thin motor can be realized. can.

EXAMPLE Hereinafter, a motor according to an example of the present invention will be described with reference to the drawings. In these figures, the same parts as those explained in FIG. 4 are given the same reference numerals.

FIG. 1 shows a side sectional view of a motor in a first embodiment of the invention. In FIG. 1, the motor 13 of this embodiment has a first plane part 2 magnetized with a predetermined number of poles, and a second plane part 3 has a back yoke 1 made of a magnetic material.
A rotor 21 consisting of an annular or disc-shaped permanent magnet 5 to which magnets 4 are abutted and fixed, and a stator winding 20 made of a superconducting material facing the first plane part 2 are mounted on a circuit board 25. The stator 22 is provided with a stator 22. The motor shaft 15, which rotates integrally with the rotor 21, has bearings directly attached to the circuit board 25 that are engaged with bearings 16a and 16b of a member 16, and is rotatably and slidably supported, and is supported by the back yoke. A part of the bearing 14 is in contact with the bearing 16a of the member 16, and due to the magnetic force of the permanent magnet 5, a thrust load due to an attractive force generated between the permanent magnet 5 and the circuit board 25 is applied to the bearing 16b. I am receiving it. FIG. 2 is a plan view of a stator winding 20 of a motor in one embodiment of the present invention.

The stator winding 20 is made of a superconducting material and is provided in the form of a thin film on a circuit board 25 as shown in the figure. The stator winding 20 is led to the back side of the circuit board 25 through a hole made in the circuit board 25 at a position 20a, and is led to the front side again at a position 25b.

The operation of the motor configured as described above will be described below with reference to FIGS. 1 and 2.

The fixed pre-winding 1W20 is connected to the circuit board 25 as shown in FIG.
A planar coil is formed on top, with fewer turns than conventional coils, but because it is made of superconducting material, it can carry large currents without generating heat. Therefore, even with the stator winding formed in the form of a thin film as described above, it is possible to generate a magnetic field equal to or greater than that of the conventional stator winding.

As described above, according to this embodiment, by using a superconducting material for the stator winding, the stator winding, which was conventionally configured three-dimensionally, can be made into a two-dimensional configuration, and the stator winding is thin and thin. motor can be configured.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a side sectional view of a motor showing a second embodiment of the present invention. The difference from the configuration shown in Figure 1 is the back yoke 14.
Instead of the permanent magnet 5, a closed rotating pre-winding 'a26 made of a predetermined number of superconducting materials is provided on the first flat part 24 of the magnet.

The operation of the motor configured as described above will be described below. Since the rotor winding 26 is a closed coil, when a permanent current is passed through the winding, a magnetic field can be generated and an action similar to that of a permanent magnet can be caused. A persistent current is passed through this winding 26 so that adjacent windings have opposite polarities,
If it is used as a magnetic pole, it can be used in place of the permanent magnet 5 of the first embodiment.

As described above, the closed rotor winding 2 is made of a predetermined number of superconducting materials in which a permanent current is passed instead of the permanent magnets 5.
6, it is possible to construct a motor that is even thinner than that of the first embodiment.

In the above examples, as the superconductor material, a so-called room temperature superconductor is used, or a material whose superconducting critical temperature is between room temperature and the boiling point of liquid nitrogen is used and cooled with liquid nitrogen (not shown). All you have to do is . An example of a room temperature superconductor is a ceramic oxide containing strontium (Sr), barium (Ba), yttrium (Y), and copper (Cu) in a ratio of 1:11:3. As an example of its production method, S
r A predetermined amount of each powder of CO3 and CuO is mixed, pulverized, and calcined in air at 920°C for 5 hours. This firing and crushing process is repeated three times to improve homogeneity. After cold compression molding the mixed powder treated in this way, it is produced by firing in air at 1000° C. for 5 hours and slowly cooling.

Note that in the first and second embodiments, the stator winding 20 is provided directly on the circuit board 25, but it may be provided on another, for example, a flexible circuit board, and then attached to a member that becomes the stator flat plate. You can also use it as

Further, in the second embodiment, the rotor winding 26 is similarly provided on a flexible circuit board, etc., and the rotor winding 26 is attached to the back yoke 14.
It may also be configured to be attached to.

Effects of the Invention As described above, the present invention uses a superconducting material for the stator winding or rotor winding, and provides the stator winding or rotor winding directly on the circuit board or the plane of the back yoke. , it is possible to realize an ultra-thin motor.

Additionally, if the superconducting material could be provided on a circuit board in a manner similar to printed wiring, the manufacturing process for the motor would be extremely simple, and the cost of the motor could be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a motor in a first embodiment of the present invention, FIG. 2 is a plan view of the stator winding 20 of FIG. 1, and FIG. 3 is a motor in a second embodiment of the present invention. FIG. 4 is a side sectional view of a conventional motor. 5...Permanent magnet, 15...Motor shaft,
16... Bearing is a member, 20... Stator winding, ■... Rotor, casing... Stator,
26... Stator winding. Name of agent: Patent attorney Toshio Nakao 1 person 5" - Permanent magnet 15 - Motor shaft 16 - Bearing member 2θ - Stator winding 2/-m - Rotor gear fixed Fig. 1 1, Fig. 2 ?6- Figure 3, Figure 4

Claims (2)

[Claims] (1) A motor shaft, which rotates integrally with the motor shaft, has a first flat part magnetized with a predetermined number of poles, and has a back yoke made of a magnetic material arranged in a second flat part. a rotor including an annular or disc-shaped permanent magnet; and a stator comprising a stator winding made of a superconducting material provided on a circuit board opposite to a first plane part of the rotor. , a bearing member that rotatably and slidably supports the motor shaft. (2) A predetermined number of superconducting coils are provided on the first plane part of a back yoke made of a magnetic material, and a rotor is provided to cause a permanent current to flow through the superconducting coils to form magnetic poles. Motors described in range item (1).