JP3095147B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and is preferably applied to a motor which detects a position of a magnet by using a magnetic detecting element such as a Hall element.

[0002]

2. Description of the Related Art Conventionally, in a radial gap type motor having an iron core and a gap between a rotor and a stator formed in a direction substantially parallel to a rotation axis, for example, a hole for detecting a rotation position of the rotor is used. A magnetic detecting element such as an element is arranged at a position where a magnetic flux of a magnet provided on the rotor side can be detected.

That is, as shown in FIG. 3, a motor 1 has a cylindrical rotating shaft support 4 planted at the center of the plane of a fixed member 3 forming a stator.
The rotating shaft 11 is provided on the inner peripheral surface via bearings 8A and 8B.
Are rotatably supported.

A yoke member 12 forming a rotor is fixed to the tip of the rotating shaft 11, and a cylindrical magnet 13 is fixed to the inner peripheral surface of the yoke member 12, and the yoke member 12 and the magnet 13 are connected to the rotating shaft. 11 so as to rotate integrally therewith.

[0005] Further, an iron core 5 having a laminated structure is fixed to the outer peripheral surface of the rotating shaft support portion 4, and a winding 6 is wound around the iron core 5.

Accordingly, by supplying a drive current to the winding 6, the magnetic flux B generated from the magnet 13 is attracted or repelled by the iron core 5 in accordance with the direction of the drive current.
As a result, the rotor unit including the yoke member 12 and the magnet 13 is rotated.

[0007]

Here, on the fixed member 3, the amount of magnetic flux from the magnet 13 is detected to detect the rotational position of the magnet 13 (that is, the rotor portion), such as a Hall element or the like. The lead 15B is fixed by a solder 16 on a wiring pattern formed on the surface of the fixing member 3 with the magnetic sensing surface 15A of the detecting element 15 facing upward.

However, when the magnetic detecting element 15 is arranged at a position not facing the magnet 13,
Since only the leakage flux between the magnet 13 and the iron core 5 is detected, sufficient magnetic flux cannot be detected, and it is difficult to obtain a sufficient output for driving the motor 1 as an output of the magnetic detection element 15. Problem.

As one method for solving this problem, as shown in FIG.
A configuration is conceivable in which A is opposed to the magnet 13 and is arranged as close to the magnet 13 as possible.

However, in the motor 20 having such a configuration, the magnetic detecting element 22 is different from the motor 1 shown in FIG.
However, there is a problem that the mounting process such as positioning of the components becomes complicated, and the defect rate increases.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a motor capable of mounting a magnetic detecting element capable of detecting a sufficient magnetic flux for driving the motor in a simpler process. Is what you do.

[0012]

According to the present invention, the rotor is rotated in one direction by a magnetic field B generated between the iron core 5 and the magnet 13. Accordingly, in the motor configured to detect the position of the magnet 13, the magnetic flux generated from the iron core 5 and the magnetic flux B generated from the magnet 13
Are provided in a direction in which they repel each other and bend in the same direction.
Is provided.

[0013]

The magnetic detecting element 15 is provided for detecting the position of the magnet 13 in a direction in which the magnetic flux generated from the iron core 5 and the magnetic flux generated from the magnet 13 repel each other and bend, thereby providing the magnetic detecting element 15 to the magnet. The magnetic field B generated by the iron core 5 and the magnet 13 can be detected in a practically sufficient range without being provided at the opposed position, and thus the magnetic detection element 15 can be more easily mounted.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIG. 1, in which parts corresponding to those in FIGS. 3 and 4 are denoted by the same reference numerals, a motor 30 is mounted on a fixed member 3 with a magnetic sensing element 15 with its magnetically sensitive surface 15A facing upward and a solder 16. Thus, the lead 15B is fixed.

The magnetic detecting element 15 is provided at a position where the magnetic flux B from the magnet 13 and the magnetic core 5 always repel each other. The detection is performed by the surface 15A.

That is, in FIG. 2 showing a cross section of this motor, when the rotation direction of the yoke member 12 and the magnet 13 is one direction shown by the arrow a, the driving current supplied to the winding 6 of the iron core 5 is: Electric current is supplied in such a direction as to repel the magnet 13 located on the rotation direction a side of the magnet 13 facing the iron core 5.

Accordingly, when the iron core 5 and the magnet 13 are in a positional relationship as shown in FIG. 2, a drive current is supplied in a direction such that the iron core 5 has an N pole.

When the magnet 13 rotates and the S-pole magnet arrives at the position of the N-pole magnet 13 shown in FIG. 2, a drive current is supplied in such a direction that an S-pole is generated in the iron core 5. As a result, the magnet is repelled and further rotates in the direction a.

Therefore, while the motor 30 is rotating, the right side of the iron core 5 in FIG.
3, the magnetic flux from the iron core 5 and the magnetic flux from the magnet 13 always repel each other (FIG. 1), so that the magnetic flux B therebetween is always in the vertical direction (that is, the rotating shaft 11). (In a direction parallel to).

The magnetic field of the iron core 5 obtained by applying a drive current to the winding 6 changes its current value and direction in accordance with the rotating operation of the magnet 13 and is bent up and down. The magnetic flux from the iron core 5 is
The amount of the magnetic flux is changed in the same manner as the magnetic flux that changes in accordance with the movement of the motor 3.

Accordingly, a magnetic flux B, which is a combination of the magnetic flux generated by the iron core 5 and the magnetic flux generated by the magnet 13, is applied to the magnetic detecting element 15.
Can be detected on the magneto-sensitive surface 15A by a sufficient amount for practical use.

According to the above configuration, by arranging the magnetic sensing element 15 at a position where the magnetic flux B is bent in the vertical direction, the magnetic sensing element 15 can be provided with the magnetic sensing surface 15A facing upward. As compared with the conventional case where the position detecting element 22 is provided with the magnetic sensing surface 22A facing the magnet 13 (FIG. 4), the magnetic detecting element 15 is formed on the wiring pattern formed on the fixing member 3. Then, the magnetic sensing element 15 can be mounted by a simple process of simply soldering the lead 15B.

Thus, the mounting process of the position detecting element 15 can be further simplified.

Incidentally, the magnetic flux obtained by the winding 6 increases as the current supplied to the winding 6 increases, so that the load on the motor 30 is increased, for example, at the time of starting, and the driving current value is increased. In this case, a larger detection output can be obtained in the magnetic detection element 15.

In the above-described embodiment, the case where the right end of the iron core 5 is selected as shown in FIG. 2 as the disposition position of the magnetic detecting element 15 has been described. However, the present invention is not limited to this. May be any position as long as the magnetic flux B by the iron core 5 and the magnet 13 repels.

In the above-described embodiment, a case has been described in which a Hall element is used as the magnetic detection element 15, but the present invention is not limited to this, and various other magnetic detection elements can be applied.

[0028]

As described above, according to the present invention, the magnetic flux of the magnet and the iron core repelled from each other and bent in the same direction is detected by the magneto-sensitive surface provided on the surface crossing the magnetic flux. As a result, a magnetic flux sufficient to drive the motor can be detected. Further, by providing the magnetic sensing surface of the magnetic detection element on the surface crossing the bent magnetic flux, the magnetic detection element can be mounted in a simpler mounting process.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a motor according to the present invention.

FIG. 2 is a sectional view showing an arrangement position of a position detecting element according to the present invention.

FIG. 3 is a sectional view showing a conventional motor.

FIG. 4 is a sectional view showing a conventional motor.

[Explanation of symbols]

1, 20, 30 ... motor, 5 ... iron core, 6 ... winding,
11 ... rotating shaft, 12 ... yoke member, 13 ... magnet, 15, 22 ... position detecting element.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 29/08, 21/22 H02K 11/00

Claims (1)

(57) [Claims] 1. A motor in which a rotor is rotated in one direction by a magnetic field generated between an iron core and a magnet, and wherein the position of the magnet is detected by a magnetic detecting element. The magnetic flux generated from the magnet and the magnetic flux generated from the magnet are repelled and are provided in a direction in which they are bent in the same direction.
A motor comprising the magnetic detection element having a surface disposed thereon.