JPH01278248A - Fan motor - Google Patents

Abstract

PURPOSE:To largely reduce a cost by providing a permanent magnet at an impeller as a rotor, and mounting an electromagnet, a magnetic unit and a detector in a casing as a stator. CONSTITUTION:When a power source switch S is turned OFF, the attracting force of the permanent magnet 4 of an impeller 3 is operated at a magnetic unit 6 and the core 5a of an electromagnet 5 to stop the impeller 3 at a relative deviation position D. On the other hand, when the magnet 4 of the impeller 3 is disposed near the position D, a detector 7 is operated to close a conducting circuit 20 conductively. When the switch S is turned ON in this state, the circuit 20 is conducted so that the magnet 4 is received by a repelling force by the magnet 5, and the impeller 3 is normally rotated clockwise. When the magnet 4 separates at its relative deviation from the position D, the detector 7 stops the circuit 20, but the impeller 3 is idly rotated, and the attracting force of the magnet 4 is again operated at the unit 6 and the core 5a to rotate the impeller 3 to the position D. Similarly, the impeller 3 is continuously rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fan motor 1 used in various electronic devices and the like.

(Prior Art) As a 77-inch motor of this type, the one shown in FIG. 6, for example, is conventionally known.

That is, an impeller 3 is provided in a ventilation passage 8 of a casing 11, a drive motor 9 is fixed to the back surface of the impeller 3, and the rotation shaft 9a is fixed to the impeller 3.
The impeller 3 is directly connected to and rotates.

Note that the reference numeral 17 in the figure is an arm for supporting the drive motor 9 and the impeller 3.

(Problems to be Solved by the Invention) The following problems are pointed out in the conventional example described above.

(a) Since the structure of the drive motor 9 is complicated, the cost ratio of the drive motor 9 itself to the entire 7-amp motor is high, which is a net impediment to reducing the cost of the fan motor.

(b) Since the relatively large diameter drive motor 9 blocks the central portion of the ventilation passage 8, the ventilation efficiency decreases.

(c) Since the impeller 3 is rotated by the rotational driving force of the rotating shaft 9a, it is necessary to mechanically strengthen the structure of the rotating shaft 9a and its support, which increases the cost of the casing 11. What is happening.

(d) The energization angle of the drive motor is too large to rotate the impeller 3 (and power consumption cannot be reduced).

The present invention aims to solve the problems pointed out in (a) to (d) above.

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured as follows.

That is, a rotor 2 is constructed by arranging a plurality of permanent magnets 4 at a required relative angle on the periphery of an impeller 3, and one or more electromagnets 5 and at least one electromagnet 5 are arranged on the inner periphery of a casing 11. It consists of a stator 10 configured by arranging a magnetic body 6,
A conductive circuit 20 is connected to the field coil 5a of the electromagnet 5, and the magnetic body 6 is placed at a required relative declination position with respect to the electromagnet 5, and the permanent magnet 4 of 3 blades is placed at a relative declination position. A detector 7 is attached to the inner periphery of the casing 11 to detect that the conductive circuit 20 is in the vicinity and to make the conductive circuit 20 conductive. and the core 5b of the electromagnet 5 to rotate the impeller 3 toward the relative declination position, and in a conductive state, the repulsive force of the electromagnet 5 acts on the permanent magnet 4 to rotate the impeller 3 in the normal direction. It is characterized by the fact that

(Function) In the present invention, the impeller itself functions as a rotor and the casing itself functions as a stator, as described above, without using a separate drive motor as in the conventional example. .

Hereinafter, for convenience of explanation, the operation will be explained with reference to FIGS. 1 and 2.

When the power switch S is off, the attractive force of the permanent magnet 4 of the impeller 3 acts on the magnetic body 6 and the core 5a of the electromagnet 5, and the impeller 3 is located at a position where the attractive forces of the permanent magnet 4 are balanced. * It is stopped in a state of being deviated to the relative declination angle position Dg1M.

On the other hand, when the permanent magnet 4 of the impeller 3 is in the vicinity of the relative declination position, the detector 7 is activated to close the conductive circuit 20 so as to allow conduction.

When the power switch S is turned on in this state, the conductive circuit 20
becomes conductive, and the permanent magnet 4 receives a repulsive force from the electromagnet 5, causing the impeller 3 to rotate normally in the clockwise direction (arrow A). When the permanent magnet 4 moves away from the relative declination position, the detector 7 opens the conductive circuit 20 and the conduction is stopped. However, the impeller 3 rotates due to inertia, and the attractive force of the permanent magnet 4 is again applied to the magnetic body 6. and the core 5a of the electromagnet 5, respectively, to rotate the impeller 3 to the relative deflection angle position Dllll.

Thereafter, the impeller 3 continuously rotates in the same manner.

In this way, in the present invention, the blades 113 are only supported by the support shaft 17, and a rotation shaft for transmitting rotational driving force is not required.

In addition, the energization angle may be small to rotate the impeller 3. In other words, the time to energize the field coil is short, and power consumption is low.

(Example) Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the 77 motor according to the present invention, and is a plan view showing the state with the upper frame removed, and FIG.
It is a longitudinal cross-sectional view taken along the line ■-■ in the figure.

In these figures, numeral 1 indicates the entire 77-monitor;
This fan motor 1 includes a rotor 2 in which permanent magnets 4 are arranged and fixed at the peripheral edge of each blade of a blade IL3, and three electromagnets 5 and one magnetic body 6 are placed at required positions in the inner peripheral part of a casing 11. The stator 10 is arranged and configured.

The casing 11 consists of a case frame body 11A with an upper axle 11B assembled and fixed with bolts 19, an impeller 3 arranged in a ventilation passage 8 formed in the center, and a case frame body 11A.
Concave portions 1 are provided at the four corners of
2, each of which is configured to be equipped with an electromagnet 5 or a magnetic body 6. Note that reference numeral 13 is an inner wall forming the ventilation passage 8, and reference numeral 14 is an outer wall.
14, connections such as the conductive circuit 20 of the electromagnet 5 are wired.

The case frame main body 11A and the upper axle 11B are each formed with a pair of four blade single support arms 15 and a support shaft boss 16 facing toward the center of the ventilation hole, and the impeller 3 has a pair of posts 16, Ball bearing 1 is attached to support shaft 17 supported by 16.
It is rotatably supported via 8.

Each of the electromagnets 5 is constructed by winding a field filter 5a around a core (iron core) 5a, and a field coil 5b.
are connected in series to the electromagnetic circuit 20.

On the other hand, the magnetic body 6 is formed of a ferromagnetic material such as a piece of iron, and has a relative declination that is offset by the declination θ#5゛ in the normal rotation direction (clockwise in FIG. 1) with respect to the position of the electromagnet 5. It is placed in position.

Further, a detector 7 is assembled in a pair with the magnetic body 6, and this detector 7 detects that the permanent magnet 4 of the impeller 3 is near the relative declination position and conducts the conductive circuit 20. It is something to do.

It is preferable to use a Hall element as this detector 7 in consideration of durability, stability, simplicity of structure, etc.
However, the present invention is not limited to this, and a reed switch, a photoelectric switch, or the like can be used. That is, as long as the conductive circuit 20 is electrically connected when the permanent magnet 4 of the impeller 3 reaches the relative declination position DIIA with respect to the electromagnet 5, various modifications can be made.

Note that the symbol E in the conductive circuit 20 is a power source, and the symbol S is a power switch provided as necessary.

In the above embodiment, when the power switch S is off, the impeller 3 is stopped in the state shown in FIG. There is.

When the power switch S is turned on in this state, the field coil 5
When a current flows through b, the permanent magnet 4 receives a repulsive force due to the magnetic field, and the impeller 3 rotates normally in the direction of the arrow.

When the permanent magnet 4 moves away from the relative declination position, the detector 7
opens the conductive circuit 20 and the conduction is stopped, but the impeller 3 rotates due to inertia, and the attractive force of the permanent magnet 4 acts on the magnetic body 6 and the core 5a of the electromagnet 5 again.
The impeller 3 is rotated to a relative deviation angle position. This causes the impeller 3 to rotate continuously. Incidentally, according to the present embodiment, the conduction angle is set to about 10° to allow current to flow through the field coil 5b, and the field coil 5b can be continuously rotated for 40 days with a battery E of 1.5V.

FIG. 3 is a plan view showing a second embodiment of the 7T engine according to the present invention. That is, this embodiment is the simplest fan motor configured by providing two permanent magnets 4 on an impeller 3 having two blades, and disposing one electromagnet 5 on the inner circumference of the casing 11. Other points are constructed in the same manner as the first embodiment. FIG. 4 is a plan view showing a third embodiment of the fan motor according to the present invention. This embodiment shows an impeller 3 having three blades. Three permanent magnets 4 are installed in the casing 1.
Two electromagnets 5 are arranged on the inner circumference of the first embodiment, and the other points are configured similarly to the first embodiment.

FIG. 5 is a plan view showing an embodiment of #S4 of the fan motor according to the present invention, and this embodiment is shown in FIG.
It is constructed by removing one.

It goes without saying that the present invention is not limited to the above embodiments, and can be implemented with various modifications.

(Effects of the Invention) As is clear from the above description, the present invention provides the following excellent effects.

(b) It does not require a separate drive motor as in the conventional example, in other words, a permanent magnet is provided in the impeller to form the rotor, and an electromagnet, magnetic material, and detector are attached to the casing to form the stator. The fan motor has a simple structure and can significantly reduce the cost of the fan motor.

(b) Since the central part of the ventilation port is not blocked by a large-diameter drive motor as in the conventional example, the ventilation efficiency is improved.

(c) As in the conventional example, the impeller spindle simply supports the impeller without transmitting rotational driving force, so the structure of the rotating shaft and its supporting part does not need to have much stronger mechanical strength. Therefore, it is possible to reduce the cost of the casing.

(d) The conduction angle can be set sufficiently small to rotate the impeller, and power consumption can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a first embodiment of a 77 motor according to the present invention, FIG. 2 is a vertical cross-sectional view taken along the line II-II in FIG. 1, and FIGS. FIG. 1 is a diagram showing second to fourth embodiments of a 77-inch motor according to the present invention, and FIG. 6 is a plan view showing a conventional 77-inch motor. 2...Stator, 3...Blade, 4...Permanent magnet, 5...Electromagnet, 5a...Core, 5b
... Field filter, 6... Magnetic material, 7... Detector, 10... Stator, 11... Casing,
20... Conductive circuit. Patent applicant Taiyo Densan Co., Ltd. Pashi/

Claims (1)

[Claims] 1. A rotor 2 configured by arranging a plurality of permanent magnets 4 at a required relative angle on the peripheral edge of an impeller 3, and a casing 11.
A stator 10 is constructed by arranging one or more electromagnets 5 and at least one magnetic body 6 on the inner periphery of the electromagnet 5. A conductive circuit 20 is connected to the field coil 5a of the electromagnet 5, and the magnetic body 6 is placed at a required relative declination position D with respect to the electromagnet 5, and a detector 7 is provided which detects that the permanent magnet 4 of the impeller 3 is in the vicinity of the relative declination position D and makes the conductive circuit 20 conductive. A conductive circuit 20 attached to the inner circumference of the casing 11
In the off state, the attractive force of the permanent magnet 4 of the impeller 3 acts on the magnetic body 6 and the core 5b of the electromagnet 5, respectively, and the impeller 3
The fan motor 2 and the conductive circuit 20 are characterized in that the fan motor 2 and the conductive circuit 20 are configured so that the repulsive force of the electromagnet 5 acts on the permanent magnet 4 to rotate the impeller 3 in the normal direction when the electromagnet 5 is in a conductive state. The fan motor according to claim 1, wherein the conductive detector 7 is constituted by a Hall element, and the Hall element is arranged at the relative deflection angle position.