JPS5918485Y2 - Light source tracking motor - Google Patents

Description

[Detailed description of the invention] The invention relates to a light source tracking motor that automatically rotates and follows the movement of the light source. The present invention provides a light source tracking motor suitable for a device that rotationally follows a light receiving surface.

For example, in water heaters that utilize solar heat, power generation devices that utilize solar cells, etc., it is desirable that the light-receiving surface always face in the direction that maximizes light energy absorption.

The present invention realizes a light source tracking motor that is effective for making the light receiving surface of such a device follow the movement of the light source (sun), and will be described in detail below with reference to the drawings.

FIG. 1 is a diagram of the operating principle of the present invention, where SR is a cylindrical stator made of permanent magnets N and S, RR is a rotor whose driving current is the output current of a photoelectric conversion element PD, and SUN is a light source (sunlight). ).

In FIG. 1a, the light source conversion element PD is located on the N pole side of the stator SR, so the rotor RR rotates counterclockwise according to Fleming's left-hand rule.

On the other hand, in FIG. 1, since the photoelectric conversion element PD is located on the S pole side of the stator SR, the rotor RR will rotate clockwise.

That is, according to the configuration shown in FIG. 1, the rotation direction of the rotor RR differs depending on whether the photoelectric conversion element PD is located on the left or right side of the SN pole boundary of the stator SR, and the photoelectric conversion element PD is located on the SN pole boundary. It stops when it reaches the boundary.

The present invention focuses on such a principle and realizes a motor that automatically follows the rotation of the light source so that the absorption of light energy is always maximized in accordance with the movement of the light source, without a power source and wirelessly.

FIG. 2 is an external view showing an embodiment of the present invention.

In Figure 2, MO is a motor that uses light as a driving source, and GT
is a reduction gear mechanism, and B is a base.

The output shaft of the motor MO is connected to the input shaft of the reduction gear mechanism GT, and the output shaft of the reduction gear mechanism GT is fixed to the base B.

FIG. 3 is a configuration diagram showing an example of the motor MO in FIG. 2, in which a is a partial sectional view, b is a simplified sectional view taken along line xx' of a, and C is an equivalent diagram of the main part. It is a circuit diagram.

In FIG. 3, 1 is a stator, 2 is a rotor, 3 is an outer cylinder, 4 is a light receiving surface, 5 is a shaft, 6 is a case, and 7 is a window body.

The stator 1 is, for example, a cylindrical magnet magnetized in S and N directions.

The rotor 2 is formed by winding a coil into a cup shape so that one winding encloses the stator 1 and rotates, and the rotor 2 has a plurality of taps 2 at equal intervals on its outer periphery.
' to 29' are provided.

The outer periphery 3 encloses the stator 1 and the rotor 2, is formed into a cylindrical shape from a magnetic material, and forms a closed magnetic path together with the stator 1.

The light-receiving surface body 4 is formed into a substantially cylindrical shape with a plurality of light-receiving surfaces 4□ to 49 arranged in the circumferential direction corresponding to the taps of the rotor 2, and is integrated with the rotor 2 via a shaft 5. has been done.

Charge conversion elements (for example, solar cells) 4,' to 49' are arranged on each light receiving surface 4, to 49, respectively.

As shown in C, these charging conversion elements 4□' to 49' are arranged so that the polarity is the same between each of the taps 2,' to 29' of the rotor 2 and the taps facing approximately diametrically. It is connected.

In other words, tap 2□'~2. ' photoelectric conversion element 4□'
The anode side of ~49' is connected and the tap 26'~
2. ' are connected to each other on their cathode sides.

The case 6 encloses the light-receiving surface body 4 and is made of, for example, plastic and has a cylindrical shape.

The window body 7 restricts the incidence of light from the outside onto the light-receiving surface body 4, and has two opening windows 7 at diametrically opposed positions.
/, 7//, and are arranged along the inner periphery of the case 6.

Note that these case 6 and window body 7 have an opening window section 7/,
7// constitutes a cover C.

In the motor MO configured in this way, the rotor 2 has the following relationship between the opening windows 7/, 7// of the window body 7 and the N and S poles of the stator 1, and the respective opening windows 7/, 7. ///
The light-receiving facepiece 4 begins to rotate in the right direction R or in the left direction, depending on the amount of light incident thereon.

For example, when light hits from the direction of 12 o'clock (photoelectric conversion element 4 □') in FIG. They flow as currents of approximately equal magnitude and in opposite directions.

On the other hand, since the external magnetic field also has opposite polarity on the left and right sides, the generated torque is added on the left and right sides, resulting in a value close to the maximum torque.

As a result, the photoelectric conversion elements 4,' to 49' rotate counterclockwise together with the rotor 2, and the photoelectric conversion elements 4,' to 49' rotate counterclockwise together with the rotor 2.
/, 43/, and continues to rotate in a state close to the maximum torque.

On the other hand, when light hits from the 6 o'clock direction (photoelectric conversion element 46'), current flows in the opposite direction to that described above, and rotation continues clockwise at a state close to the maximum torque.

The rotational torque decreases as the direction of light is moved from the 6 o'clock direction to the 3 o'clock direction, and becomes zero at the 3 o'clock direction.

If you move the direction of light from the 3 o'clock direction to the 6 o'clock direction, it will start rotating in the opposite direction, and the maximum torque will be reached at the 6 o'clock direction.

Similarly, if you move the direction of light from 6 o'clock to 9 o'clock, the rotation will stop at 9 o'clock, and if you move it past 9 o'clock to 12 o'clock, the rotational torque will increase. Therefore, the maximum torque is reached at the 12 o'clock direction.

In the case of this embodiment, since the two opening windows 7/, 7// are provided at diametrically opposed positions, the rotation of the rotor 2 is carried out from the opening windows 7', 7'' to the light receiving surface 4. This will continue as long as the amount of light incident on both ends is not equal.

That is, if the cover consisting of the case 6 and the window body 7 is rotated by some means so that the amount of light incident on the light-receiving surface body 4 from the opening windows 7/, 7// becomes equal,
In this state, the rotor 2 stops rotating, and the cover shows directionality with respect to the light source.

Referring again to FIG. 2, when the light receiving surface 4 integrated with the rotor of the motor MO rotates, the rotation of the light receiving surface 4, that is, the rotation of the rotor, is transmitted to the reduction gear mechanism GT.

Here, since the output shaft of the reduction gear mechanism GT is fixed to the base B, the cover of the motor MO, the outer cylinder 3 including the rotor, and the main body of the reduction gear mechanism GT are connected to the reduction gear mechanism GT.
This results in rotation relative to the output shaft of the base B and the base B.

As mentioned above, the opening windows 7' and 7'' of the cover C are
It rotates to a position where the amount of light incident on the light-receiving facepiece 4 is equal, that is, a position where the line connecting the centers of the opening windows 7/, 7// is orthogonal to the direction of the light source and then stops.

Note that the number of reduction stages of the reduction gear mechanism GT, that is, the rotational direction of the shaft, is set so that the rotation is such that the amount of light received from the windows 7' and 7'' is equal.

As described above, according to the present invention, it is possible to realize a light source tracking motor that automatically rotates and follows the movement of the light source. It is suitable for an attitude control mechanism that automatically follows rotation so that optical energy absorption is always maximized in response to movement.

Further, by using such a motor, rotational displacement can be transmitted through light in a non-contact manner, and power can also be transmitted within a completely sealed area.

Further, by using the motor according to the present invention as a light source position detector and using a large servo motor as a drive motor, a light source tracking device for a large device can be constructed.

Furthermore, three-dimensional control is also possible by using two motors, one for horizontal direction control and one for vertical direction control.

In addition, in this embodiment, an example was explained in which two opening window portions were provided at positions facing each other in the diametrical direction of the window body. A light shielding plate may be provided so as to be divided into two.

In this case, it rotates to a position where the amount of light entering from the left and right windows divided by the light shielding plate is equal, and then stops.

FIG. 4 is an external view showing an example of such an embodiment, and the same parts as in FIG. 2 are given the same reference numerals.

In FIG. 4, P is a light shielding plate.

This light-shielding plate P is arranged to coincide with the boundary position of the SN pole of the stator and in a direction perpendicular to the window portion 7'.

Due to this light shielding plate P, when the window portion 7' is deviated from the direction of the light source, the imbalance in the amount of light between the left and right windows is magnified.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the operating principle of the present invention, Fig. 2 is an external view showing an embodiment of the present invention, Fig. 3 is a component country showing an example of the motor in Fig. 2, and Fig. 4 is an illustration of an embodiment of the present invention. FIG. 2 is an external view showing an example.

Claims (1)

[Scope of utility model registration request] a stator that generates a fixed magnetic field; a rotor that includes a plurality of taps arranged at approximately equal intervals and a coil that is rotatably arranged in the magnetic field of the stator; and a rotor that is arranged to rotate together with the rotor. a plurality of charging conversion elements that provide a photoelectric conversion output between each tap of the converter; a cover having an opening window portion for letting light into the photoelectric conversion element formed to enclose these photoelectric conversion elements; and a cover connected to the rotor. A light source following motor consisting of a reduction gear mechanism and a base to which the output shaft of the reduction gear mechanism is fixed.