JP2003324924A - Motor of electric reel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a motor being used in an electric reel in which a loss due to a gap between a field magnet and the outer circumferential surface is reduced as much as possible. <P>SOLUTION: The motor 4 for rotary driving the spool 3 of the electric reel comprises a case 30, a fixing member 38, a rotary shaft 32, an armature 33, and a field 31. The case 30 has an internal space. The rotary shaft 32 is supported rotatably by the case 30. The pipe-like fixing member 38 is secured to the inner circumferential surface of the case 30. The armature 33 is secured to the rotary shaft 32. The field 31 has an arcuate outer circumferential cross- section conforming to the inner circumferential surface of the fixing member 38 and two permanent magnets 31a and 32b are arranged on the inner circumferential surface of the fixing member 38 while being spaced apart from each other in the rotational direction and being spaced apart from the armature 33. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to an electric reel motor for rotationally driving a spool of an electric reel.

[0002]

2. Description of the Related Art An electric reel is a reel that uses a motor to drive a spool for bobbin to rotate in a bobbin winding direction, and is an underwater animal to be fished that lives mainly in a relatively deep water depth of 100 m or more. It is used as a mounting member when fishing. However, recently, it is also used for fishing for underwater animals such as squid that live in a relatively shallow water depth of about 50 m, and a small electric reel has been developed for use in such fishing.

A DC motor used for an electric reel is generally a hollow case member, a rotary shaft rotatably mounted on the case member, an armature fixed to the rotary shaft, and an inner peripheral surface of the case member. And a field composed of a plurality of magnets arranged at intervals in the rotational direction and with an armature. The case member has a case body formed into a cylindrical shape with a bottom by drawing a plate material, and a cap member that closes an opening of the case body. The armature has an armature core having a plurality of radially projecting pole portions and an armature winding wound around the pole portions. The armature core is formed by stacking thin plates made of silicon alloy on which a notch for winding the armature winding is formed. The gap between the inner peripheral surface of the field and the outer peripheral surface of the armature iron core is set in order to suppress the reduction of the magnetic field strength.
Conventionally, it is very narrow, about 0.3 mm.

The electric reel is required to have strong torque and low power consumption. For this reason, it is known to use a permanent magnet made of a rare earth metal for the field. In the case of a permanent magnet made of a rare earth metal, especially when a sintered magnet is used, the magnetic field becomes strong and the winding torque is improved.
In a conventional motor using a rare earth metal permanent magnet, a plurality of magnets sintered in a plate shape are arranged side by side in the rotation direction on the inner peripheral surface of the case body in order to prevent deformation.

[0005]

In the above conventional motor, the winding torque is improved by using the rare earth magnet for the field. However, since the linear plate-shaped permanent magnet is arranged on the arc-shaped inner peripheral surface of the case main body, an arcuate gap is formed between the magnet and the inner peripheral surface of the case main body. Although the gap is filled with an adhesive, the loss of the magnetic force increases because of the gap.

Therefore, it is conceivable to cut the magnet sintered and formed along the arc of the case body. However, since the case body is formed by drawing, it is difficult to obtain a sufficient roundness, and a gap is generated between the case body and the magnet, which easily causes loss. Moreover, when the magnetic field of the field becomes strong by using rare earth metal, the increase rate of the force that the armature core receives when the pole of the armature core passes through the end of the field becomes extremely high, and the strength becomes strong at both ends. Cogging may occur. If strong cogging occurs, the rotation efficiency of the armature deteriorates, power consumption may increase, and vibration may increase, resulting in insufficient performance.

An object of the present invention is to suppress the loss due to the gap between the field magnet and the outer peripheral surface of the motor in the motor used for the electric reel as much as possible. Another subject of the present invention is
In a motor used for an electric reel, the strength of a magnetic field can be maintained to prevent the occurrence of cogging.

[0008]

An electric reel motor according to a first aspect of the present invention is a motor for rotationally driving a spool of an electric reel, and includes a case member, a mounting member, a rotating shaft, an armature, and a field magnet. It has and. The case member is a member having a space inside. The mounting member is a pipe-shaped member fixed to the inner peripheral surface of the case member. The rotating shaft is a shaft rotatably supported by the case member. The armature is fixed to the rotating shaft. The field is a rare earth element whose outer peripheral surface is formed in an arcuate shape along the inner peripheral surface of the mounting member, and which is arranged on the inner peripheral surface of the mounting member at intervals in the rotational direction and with a gap from the armature. It has a plurality of metal magnets.

In this electric reel motor, when a current flows through the armature, it rotates in the magnetic field generated by the field magnet. The cross sections of the outer peripheral surfaces of the plurality of field magnets are formed in an arc shape along the inner peripheral surface of the pipe-shaped mounting member. Since the mounting member is a pipe-shaped member, the roundness of the inner peripheral surface can be easily obtained by press molding or machining. Therefore, a gap between the inner peripheral surface of the mounting member and the outer peripheral surface of the magnet is less likely to occur, and the loss due to the gap between the outer peripheral surface of the magnet and the field magnet can be suppressed as much as possible.

An electric reel motor according to a second aspect of the present invention is the motor according to the first aspect, wherein the magnet has a gap between the armature and both ends in the rotation direction wider than that between the armature and the center in the rotation direction. Is formed. In this case, since the gap between the armatures at both ends of each field magnet is wider than the gap at the center in the rotational direction, the magnetic field at both ends becomes weaker and the rate of increase in the force received by the armature core is increased at both ends. Not so high. For this reason, even if the magnetic field of the field is strongly maintained by using a rare earth metal, the cogging at both ends of the field magnet is reduced.

An electric reel motor according to a third aspect of the present invention is the electric reel motor according to the first or second aspect, wherein the mounting member is made of a ferromagnetic metal. In this case, the mounting member functions as a yoke even when the thickness of the case member is thin, the magnetic leakage can be prevented by the mounting member, and there is no need to provide a flux ring for preventing the magnetic leakage. Therefore, the outer diameter of the motor can be prevented from increasing, and the reel body and the spool can be prevented from increasing in size.

An electric reel motor according to a fourth aspect of the present invention is the motor according to any one of the first to third aspects, wherein the mounting member is made of iron. In this case, the mounting member can be manufactured inexpensively and easily by using widely used iron. An electric reel motor according to a fifth aspect of the present invention is the first to fourth aspects of the invention.
In the motor according to any one of 1 to 3, the length of the mounting member in the rotation axis direction is longer than the length of the magnet in the rotation axis direction. In this case, since the mounting member has a longer length in the rotation axis direction than the magnet, the mounting member can further reduce the magnetic leakage.

[0013]

1 and 2, an electric reel adopting an embodiment of the present invention is mainly composed of a reel main body 2 to which a handle 1 is attached and a reel main body 2 which is rotatably attached. It has a spool 3 and a motor 4 mounted in the spool 3. A counter 5 for displaying the water depth and the like is mounted on the upper part of the reel body 2. Inside the reel body 2, the spool of the rotation of the handle 1
A rotation transmission mechanism 6 that transmits the rotation of the motor 4 to the spool 3 is also provided.

As shown in FIG. 2, the reel unit 2 includes a frame 10 and a side cover 1 that covers both sides of the frame 10.
1 and 12. The frame 10 is an integrally molded member made of aluminum die-cast, and the left and right 1
It has a pair of side plates 13 and 14 and a connecting member 15 that connects the side plates 13 and 14 at a plurality of locations. Lower connecting member 1
5, a rod mounting leg 17 for mounting a fishing rod is mounted.

The side cover 12 is fastened to the side plate 14 with bolts. A fixed frame 16 for mounting the rotation transmission mechanism 6 and the like is fastened to the side cover 12 with bolts. Therefore, when the side cover 12 is removed from the side plate 14, the fixed frame 16 is also removed from the side plate 14 together with a part of the rotation transmission mechanism 6 and the side cover 12. Side cover 1
1 is fastened to the side plate 13 with bolts. A connector (not shown) for a power cable for connecting to a power source such as a storage battery provided outside is provided at the front portion of the side cover 11.

As shown in FIG. 2, the side plate 13 is a plate member made of synthetic resin having a rib on the peripheral edge thereof, and a bulging portion 20 for mounting the motor 4 is provided at the center (outside). Figure 2
It is formed so as to project to the right). Inside the bulging portion 20, the cylindrical motor holding portion 2 protruding inward (rightward in FIG. 2).
0a and a clutch housing portion 20b protruding outward (leftward in FIG. 2) from the inner peripheral side of the motor holding portion 20a. The base end portion of the motor 4 is fastened to the inner end surface of the motor holding portion 20a with a mounting bolt 23. Also,
A rolling bearing 25 for rotatably supporting one end of the spool 3 is mounted on the outer peripheral surface of the motor holding portion 20a. The outer ring 25a of the rolling bearing 25 is mounted on the inner peripheral surface of the spool 3, and the inner ring 25b is mounted on the outer peripheral surface of the motor holding portion 20a, and is sandwiched between the motor 4 and the motor holding portion 20a. A one-way clutch 29 is attached to the inner peripheral surface of the clutch storage portion 20b. The one-way clutch 29 is of a roller type and inhibits rotation of a rotation shaft 32 (described later) of the motor 4 in the yarn feeding direction.

The motor 4 is, as shown in FIGS. 2 to 4,
A hollow case 30, a pipe-shaped mounting member 38 fixed to the inner peripheral surface of the case 30, a tubular field magnet 31 fixed to the inner peripheral surface of the mounting member 38, and a rotatably mounted case 30. The rotating shaft 32, the armature 33 and the commutator 34 fixed to the rotating shaft 32, and the brush 35 attached to the case 30.

The case 30 is arranged inside the spool 3, and has a bottomed cylindrical case body 36 and the case body 3.
And a cap member 37 that closes the opening of No. 6. The case main body 36 is a deep-drawing press-formed metal member, and the rotary shaft 32 is rotatably supported on the bottom of the case main body 36 via a bearing 39b. The cap member 37 is a disk-shaped member made of metal, and is caulked and fixed to the case body 36. The rotating shaft 32 is rotatably supported by the cap member 37 via a bearing 39a. Bearing 39a, 3
Reference numeral 9b is a plain bearing made of, for example, brass and having a spherical outer peripheral surface.

The mounting member 38 is a pipe-shaped member made of a ferromagnetic metal such as steel and functions as a yoke capable of preventing magnetic leakage. The outer peripheral surface of the mounting member 38 is machined so as to match the inner peripheral surface of the case body 36, and is press-fitted and fixed to the case body 36, for example. Mounting member 3
In No. 8, the roundness of the inner peripheral surface is kept high by machining. The length of the mounting member 38 in the direction of the rotation axis 32 is determined by the field 3
It is longer than the length of one magnet 31a, 31b (described later) in the direction of the rotation axis 32.

The field magnet 31 is fixed to the inner peripheral surface of the mounting member 38 by an appropriate fixing means such as adhesion. The maximum magnetic energy product of the field 31 is 111 kJ /
m ³ (= 14 MGOe (Mega Gauss Oersted))
The above two semi-circular arc-shaped permanent magnets 31 made of a rare earth alloy
It has a and 31b. Two permanent magnets 31a, 31
The outer peripheral surface of the mounting member 38 is formed in an arcuate shape along the inner peripheral surface of the mounting member 38. The inner peripheral surface of the mounting member 38 is spaced apart in the rotational direction (circumferential direction) from the armature 33. It is arranged with a gap. Inside each of the permanent magnets 31a and 31b, two N poles 40 and S poles 41 are formed at intervals in the circumferential direction. Each permanent magnet 31a, 31b is
The gap between the both ends 42a in the rotation direction and the outer peripheral surface of the armature 33 is formed to be wider than the gap between the central portion 42b and the outer peripheral surface of the armature 33. For example, as shown in FIG. 5A, each permanent magnet 31a, 31b is attached to the mounting member 3
The radius R2 of the cross section of the inner peripheral surface is larger than the radius R1 of the cross section of the outer peripheral surface substantially equal to the radius of the cross section of the inner peripheral surface of No. In the embodiment shown in FIG. 5A, the center of the radius R2 of the inner peripheral surface is displaced from the center of R1 of the outer peripheral surface (center of the mounting member 38) by the distance D1. Further, FIG. 5B shows a conventional example in which the center is the same and the inner peripheral surface and the outer peripheral surface of the magnet are concentric.

Each of the permanent magnets 31a and 31b is an anisotropic magnet obtained by, for example, sintering and solidifying rare earth alloy powder in which crystal grains are made fine and the magnetization direction is aligned in a specific direction. Specifically, each permanent magnet 31a, 31b is
(Neodymium) -Fe (iron) -B (boron) -based alloy crystal grains are refined to 1 μm or less, the rare-earth alloy crystal grains are sintered and solidified, and then cut into a desired shape,
It is a magnet obtained by magnetization. That is, the crystal grains of the rare earth alloy are formed into a cylindrical shape and magnetized in a fixed direction to produce N
The pole 40 and the S pole 41 are formed. Also, 2 after molding
The outer peripheral surface and the inner peripheral surface are cut so as to be divided into two and have radii R1 and R2.

By mounting the permanent magnets 31a and 31b on the pipe-shaped mounting member 38 in this manner, the inner peripheral surface of the mounting member 38 is maintained at a high roundness, so that the inner periphery of the mounting member 38 is maintained. A gap between the surface and the outer peripheral surface of the magnet is less likely to occur, and the loss due to the gap between the outer peripheral surface of each permanent magnet 31a, 31b of the field magnet 31 and the inner peripheral surface of the mounting member 38 can be suppressed as much as possible.

The gap between the armature 33 and both ends 42a of the permanent magnets 31a and 31b is provided in the central portion 42b.
By making the gap larger than the gap between and, the magnetic field at that portion is weakened and the increase rate of the force received by the armature 33 does not become so high. For this reason, even if the magnetic field of the field magnet 31 is strongly maintained, the cogging at both ends 42a of the permanent magnets 31a and 31b of the field magnet 31 is reduced.

Further, since the mounting member 38 is made of a ferromagnetic material, even if the thickness of the case main body 36 becomes thin, the mounting member 38
Functions as a yoke, the mounting member 38 can prevent magnetic leakage, and it is not necessary to provide a flux ring for preventing magnetic leakage. Therefore, the outer diameter of the motor 4 can be prevented from increasing, and the reel body 2 and the spool 3 can be prevented from increasing in size.

The rotary shaft 32 penetrates both ends of the case 30 and projects outward. The two sun gears 6b (FIG. 2) of the planetary gear mechanism 6a for two-step reduction that constitutes the rotation transmission mechanism 6 are mounted side by side on the protrusion on the handle 1 side.
A one-way clutch 29 is attached to the base end (left end in FIG. 2) of the rotary shaft 32. The armature 33 is arranged to face the inner peripheral surface of the field magnet 31. The armature 33 includes an armature core 45 having five pole portions 45a that radially project.
And an armature winding 46 wound around the pole portion 45a of the armature core 45. The armature core 45 is formed by stacking thin plates made of amorphous silicon alloy, and has a high magnetic permeability with less hysteresis loss.
At the tip of each pole portion 45a of the armature core 45, one of the circumferential surfaces arranged with a slight gap (specifically, about 0.1 to 1.0 mm) from the inner circumferential surface of the field magnet 31 is provided. An umbrella-shaped tip portion 45b composed of a portion is formed. Specifically, the field 3
The gap between both end portions 42a of each permanent magnet 31a, 31b of No. 1 is about 0.5 to 0.8 mm, and the gap between the central portion 42b is about 0.1 to 0.4 mm. The axial length of the armature core 45 is slightly shorter than the axial length of the field magnet 31. The armature winding 46 includes the pole portions 45 of the armature core 45.
It is wound around a and its both ends are connected to the commutator 34.

The number of poles of the armature 33 is preferably in the range of 3 to 6 poles. Within such a range, the rotation is smooth and the thickness of the pole portion 45a in the rotation direction is appropriate, and even when the saturation magnetic flux number is reached, the passing magnetic flux number increases and the driving force improves. When it has two poles, the thickness becomes thicker and the number of passing magnetic fluxes increases, but the rotation is not smooth. Also, 6
When the number of poles exceeds the pole, the rotation becomes smooth, but the thickness of the pole portion 45a becomes thin, and the number of passing magnetic flux decreases.

The commutator 34 is a conductor formed on the outer peripheral surface of a cylindrical insulating member 34a which is electrically insulated and fixed to the rotary shaft 32 and is divided into five in the circumferential direction. Commutator 34
Are electrically connected to the brush 35. Brush 35
Is fixed to a mounting member 35a made of an insulator mounted on the cap member 37, and is electrically connected to the commutator 34 on the opposing circumferential surfaces of the commutator 34. The brush 35 is
It is electrically connected to two terminals 35b arranged so as to penetrate the cap member 37 and project to the outside.

As shown in FIG. 2, the spool 3 has a cylindrical bobbin trunk 3a capable of accommodating the motor 4 and a pair of left and right spools formed on the outer periphery of the bobbin trunk 3a with a space therebetween. It has a flange portion 3b. One end of the spool 3 extends outward from the flange portion 3b, and a bearing 25 is arranged on the inner peripheral surface of the extended end portion. A gear plate 3c is fixed to the other end of the spool 3. The gear plate 3c is provided for transmitting the rotation of the spool 3 to a level wind mechanism (not shown). A rolling bearing 26 is mounted between the gear plate 3c and the fixed frame 16 at the spool center side portion of the gear plate 3c. These two bearings 2
The spool 3 is rotatably supported by the reel unit 2 by 5, 26.

The maximum magnetic energy product of the field 31 of the electric reel motor 4 thus constructed is 111 kJ / m.
³ or more. Since the maximum magnetic energy product of the field of the conventional electric reel motor is about 88 kJ / m ³ ,
The magnetic flux density radiated from the N pole 40 of the field 31 is higher than that of the conventional motor. As a result, when the number of magnetic fluxes passing through the armature 33 is not saturated, the driving force increases due to the increase in the magnetic flux, and a strong driving force is obtained. Also,
When the number of magnetic fluxes reaches saturation, the same number of magnetic fluxes can be achieved with a thin field, and the diameter of the armature 33 can be increased accordingly,
After all, the number of passing magnetic flux increases and a strong driving force can be obtained.
Therefore, in the electric reel motor, a strong driving force can be obtained without increasing the pressure or increasing the size.

Therefore, the output of the motor 4 can be increased. When the output of the motor 4 is the same as the conventional one, the total length of the motor 4 can be shortened, the width of the reel can be reduced, and a compact electric reel can be realized. When such a powerful motor 4 is used, cogging is likely to occur. However, in the present embodiment, the gap between both end portions 42a and the tip of each pole portion 45a of the armature core 45 of the armature 33 has a gap between the end portions 42a and the central portion 42b.
It is getting wider. For this reason, the magnetic field at that portion is weakened, and the increase rate of the force that the armature core receives is not so high. Therefore, even if the magnetic field of the field magnet 31 is strongly maintained, the cogging at both ends 42a of the permanent magnets 31a and 31b of the field magnet 31 is reduced.

Next, description will be made on the experimental results of investigating the reduction state of the cogging torque between the embodiment product of the present invention shown in FIG. 5A and the conventional product shown in FIG. 5B. Here, the armature uses a three-pole armature, and the outer diameters are both 13.9 mm.
Is. The inner diameter of each conventional magnet 131a, 131b is 1
4.5 mm (R1 = 7.25 mm) with an outer diameter of 1
It is 7.6 mm (R2 = 8.8 mm). Therefore, in the conventional product, the thickness of each magnet 131a, 131b is 1.55 m.
With a uniform thickness of m, gaps of 0.3 mm are evenly formed between the inner peripheral surfaces of the magnets 131a and 131b and the outer peripheral surface of the armature 33.

On the other hand, in the embodiment of the present invention, each permanent magnet 3
The outer diameters of 1a and 31b are the same as those of the conventional product, but the inner peripheral surface is formed with a radius of 8 mm (radius R2) centered on a position displaced from the axis of rotation by 0.75 mm (distance D1). Therefore, the thickness of the central portion 38b is 1.55 mm.
The same as in the conventional example, but the thickness of both end portions 42a is smaller than that. In addition, the gap in the central portion 42b is 0.3 mm.
However, the gap between both ends 42a is wider than that.

As a result, as shown in FIG. 6, the cogging torque is significantly different between the conventional product shown by the broken line and the embodiment product shown by the solid line in the vicinity of the rotation angle of 15 ° and 45 °. The cogging torque was approximately 19% of the conventional product. [Other Embodiments] (a) In the above embodiment, the anisotropic magnets 31a and 31b of anisotropic rare earth sintered alloy are used for the field magnet 31, but isotropic magnets may be used.

(B) In the above embodiment, 3 of Nd (neodymium) -Fe (iron) -B (boron) is used as the rare earth alloy.
Although the original alloy was used, other rare earth alloys may be used. (C) In the above-described embodiment, the gap is changed between the both ends and the center by changing the center and the radius of the arc on the inner and outer circumferences, but the gap may be changed by other shapes.

(D) In the above embodiment, the number of permanent magnets used for the field magnet 31 is two, but the number of permanent magnets is two.
The number is not limited to one and may be any number. However, it is preferably between 2 and 5. (E) In the above embodiment, the mounting member 38 is made of steel, but a non-magnetic material or a weak magnetic material may be used.

[0036]

According to the present invention, since the mounting member is a pipe-shaped member, the roundness of the inner peripheral surface can be easily obtained by press molding or machining. Therefore, a gap between the inner peripheral surface of the mounting member and the outer peripheral surface of the magnet is less likely to occur, and the loss due to the gap between the outer peripheral surface of the magnet and the field magnet can be suppressed as much as possible.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric reel that employs an embodiment of the present invention.

FIG. 2 is a vertical sectional view thereof.

FIG. 3 is an exploded perspective view of a motor.

FIG. 4 is a cross-sectional view of a motor.

FIG. 5 is a cross-sectional view showing the difference in field shape between the embodiment of the present invention and the conventional example.

FIG. 6 is a graph showing a reduced state of cogging torque.

[Explanation of symbols] 3 spools 4 motor 30 cases 31 field 31a, 31b Permanent magnet 32 rotation axis 33 Armature 38 Mounting member 42a both ends 42b central part

Claims (5)

[Claims] 1. A motor for an electric reel for rotatably driving a spool of an electric reel, comprising: a case member having a cylindrical space therein; and a pipe-shaped mounting member fixed to an inner peripheral surface of the case member. A rotary shaft rotatably supported by the case member; an armature fixed to the rotary shaft; and an outer peripheral surface of the mounting member formed in an arcuate cross section along the inner peripheral surface of the mounting member. A motor for an electric reel, comprising: a field magnet having a plurality of magnets made of a rare earth metal, which are arranged on the inner peripheral surface of the member at intervals in the rotational direction and are spaced from the armature. 2. The magnet according to claim 1, wherein the magnet is formed such that a gap between the armature and both ends in the rotation direction is wider than a gap between the armature and a central portion in the rotation direction. Electric reel motor. 3. The mounting member is made of a ferromagnetic metal,
The electric reel motor according to claim 1. 4. The electric reel motor according to claim 1, wherein the mounting member is made of iron. 5. The electric reel motor according to claim 1, wherein the length of the mounting member in the rotation axis direction is longer than the length of the magnet in the rotation axis direction.