JPH1141895A - Two-pole motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-pole motor which is capable of easy self-starting, even if a motor is at its lock position, without giving external auxiliary force or holding the iron core of an armature in an inclined posture before hand in a stop condition. SOLUTION: This two-pole motor is provided with a wound armature coil 33, and an iron core, which makes both ends 41a, 41b serve as a magnetic pole by energizing the coil 33 and is supported so as to rotate between a pair of permanent magnets 21a, 21b, disposed to form different polarities. Auxiliary magnetic poles 51a, 51b for generating a magnetic pole of different polarity from magnetic poles 41a, 41b which meet each other by energizing the armature coil 33, are disposed so as to make a rotation symmetry, in the vicinity of the delay side in the rotational direction of the magnetic poles 41a, 41b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC two-pole motor having a pair of permanent magnets as field poles, and more particularly to a two-pole motor having an auto-start function capable of self-starting without applying an external auxiliary force. About.

[0002]

2. Description of the Related Art As shown in FIG. 5, in a conventional two-pole motor, a pair of permanent magnets b, b, whose N and S poles face each other, are provided on a stationary housing a. , B
A rod-shaped armature iron core c is rotatably supported between the magnetic poles. An armature coil d is wound in a single winding around the armature core c, and lead terminals e, e of the armature coil d are respectively connected to a pair of rectifying segments g, g provided on a rotating shaft support f of the iron core. A pair of brushes h, h contacting each other so as to sandwich the surfaces of the rectifying segments g, g
It is configured to be attached to. When a DC voltage is applied to the brushes h, h, the iron core c is excited by the armature coil d, and the magnetic repulsion and the magnetic attraction between the electromagnetic poles c1, c2 at both ends and the permanent magnets b, b opposed thereto. The action generates a rotational torque.

In this type of DC two-pole motor having a pair of permanent magnets as field poles, the armature core c is attracted and held between the magnets b and b in a stationary state where no current is supplied. As shown in FIG. 5, the iron core c is
The magnets b and b are held between the magnets b and b in such a manner that the geometric centers of the magnets 1 and c2 and the magnetic centers of the magnets b and b are substantially on the same straight line. For this reason, even when the motor is energized next to start the motor, the iron core c is at the dead center position with respect to the magnets b and b. In this position, the commutation segments g and g are short-circuited by the brushes h and h. Therefore, the rotation torque is not generated or extremely small. Therefore, the motor does not start unless the rotation posture is changed by applying some external force to the iron core. At the dead center position, the commutation segments g, g
Is not an essential solution even if the brushes h and h are not short-circuited.

Conventionally, in order to solve such inconveniences, there is provided an auto-start function for holding the armature core c in a posture capable of self-starting in advance with respect to the permanent magnets b, b when the motor is stationary. A two-pole motor has been proposed. That is, the iron core c attracted and held by the magnets b, b is deviated from the dead center position when the motor is stopped, so that the geometric center of the electromagnetic poles c1, c2 and the magnetism of the magnets b, b The target center is shifted so as not to be on the same straight line.

More specifically, as shown in FIG. 6, magnetic members i, i such as iron pieces are attached to one side in the rotational circumferential direction of the electromagnetic poles c1, c2, respectively. The left end of () is tilted to the lower left of the figure. Thereby, the iron core c is easily rotated and started in the counterclockwise direction by energization. In FIG. 7, the magnetic members ii and ii provided on the electromagnetic poles c1 and c2 are formed integrally with the electromagnetic poles, and in addition to having the same configuration as that of the previous example, the magnets b and b sandwiching these are vertically moved. It was shifted in the direction. Also in this case, the iron core c is tilted to the lower left (the left end of the iron core), so that the posture of the iron core c can be further tilted, so that the motor can be more easily self-started.

In both FIGS. 6 and 7, when the motor is at rest, the commutation segments g, g are not short-circuited to the brushes h, h, or the rotating shaft support f
It is provided slightly offset above.

[0007]

As described above, since the two-pole motor has a dead center in its structure, it is difficult to start the motor itself and the driving means is large in torque fluctuation. Although its use range is limited, it is used as a simple driving device because of its simple structure and small number of parts.Besides being used as a teaching material for learning the principle of rotation of a motor, for example, due to its essential configuration, it can be used as a teaching material. Often done.
Therefore, such a two-pole motor is usually assembled as a finished product with its individual parts exposed, due to the nature of such cost reduction and educational aspects.

However, in order to make the motor self-startable, the armature is inclined while the motor is at rest or the magnets b and b are displaced from each other as described above. The gap with b becomes large and foreign matter easily enters this gap, and the permanent magnet attracts such foreign matter and causes rotation failure. Although it is desirable that the teaching material be capable of self-starting in consideration of the effective use after learning, it cannot be said that the teaching material is not intrinsic and has a good appearance.

The present invention has been made in view of such a problem, and its purpose is to provide an external assisting force,
An object of the present invention is to provide a two-pole motor that can be easily self-started even at a dead center position without holding the armature core in a tilted position in advance while the motor is stationary.

[0010]

According to a first aspect of the present invention, there is provided a two-pole motor having a structure in which an armature coil is wound and electromagnetic poles are formed at both ends by exciting the armature coil. A two-pole motor in which an iron core is rotatably supported between a pair of permanent magnets disposed in different polarities, wherein an excitation of the armature coil is performed near a rotation direction delay side of the electromagnetic pole. As a result, auxiliary magnetic poles for generating magnetic poles having polarities different from those of the corresponding electromagnetic poles are arranged in a rotationally symmetric manner. "
It is characterized by the following.

According to this solution, an auxiliary magnetic pole is provided in the vicinity of the electromagnetic pole on the delay side in the rotation direction, and the auxiliary magnetic pole is generated by exciting the armature coil with the magnetic pole of the electromagnetic pole. They were provided to have different polarities. Normally, each electromagnetic pole of the iron core excited by the armature coil by energizing the motor has the same polarity as the opposing permanent magnet, and the iron core has a dead point with respect to the permanent magnet, or in a posture close to the dead point, Sufficient rotation torque cannot be obtained due to magnetic repulsion, and therefore, the motor does not start itself. However, since the magnetic poles generated in the auxiliary magnetic poles by the excitation of the armature coil have different polarities from the respective magnetic poles of the iron core generated by the excitation of the same armature coil, as in the above configuration, the energization of the motor is not performed. At the same time, the auxiliary magnetic poles are attracted to the opposing permanent magnets. The direction in which the auxiliary magnetic pole acts by this attraction is as follows.
Since the auxiliary magnetic pole is positioned on the side of the iron core that is delayed in the rotation direction, the rotation direction is the rotation direction in which the motor starts. The iron core can be rotated to a self-startable posture by the rotational moment due to the suction. When the core reaches a position in which the core can be self-started, a sufficient rotational torque is generated by magnetic repulsion between each electromagnetic pole of the iron core and the opposing permanent magnet, so that the core starts rotating in the same direction as the initial rotation direction. It can be started substantially simultaneously with energization.

As described above, in the two-pole motor of the present invention, in the non-energized stationary state, even when the iron core is at the dead center or a position close to the dead center with respect to the permanent magnet, the two-pole motor can be self-started without applying external assisting force. In addition, the iron core can be easily started by itself without previously holding the iron core in an inclined position with respect to the permanent magnet. The two-pole motor according to claim 2 is
"A core having an armature coil wound thereon and having electromagnetic poles at both ends by excitation of the armature coil is rotatably supported between a pair of permanent magnets arranged in different polarities, and the electromagnetic force in a stationary state is The poles are such that the geometric center of the electromagnetic pole and the magnetic center of the permanent magnet are substantially collinear,
A two-pole motor that is held in a position facing the permanent magnet, is attached to the armature coil, and rotates the iron core to a position in which the core can be self-started by excitation of the armature coil at startup. , An activation assisting means ”.

[0013] According to this solution, a start assisting means is provided in addition to the armature coil, and when the motor is started, the core is rotated to a position in which the armature can be self-started by exciting the armature coil. In this two-pole motor, the electromagnetic pole in the stationary state is such that the geometric center of the electromagnetic pole and the magnetic center of the permanent magnet are substantially on the same straight line, that is, the electromagnetic pole is dead relative to the permanent magnet. It is held in the position that is the position of the point. Normally, in this state, the motor does not start itself even when the motor is energized.
The iron core can be rotated to a position where it can be started up,
When the iron core reaches this position, the motor starts itself. Since the start-up assisting means is made of the same armature coil that excites the iron core, the motor can be started substantially simultaneously with energization.

Therefore, the two-pole motor of the present invention can be started up without applying an external assisting force in a stationary state in which power is not supplied, while the iron core is in a position where the iron core becomes a dead center with respect to the permanent magnet. The two-pole motor according to claim 3 is
The starting assisting means according to claim 2 is limited, wherein the starting assisting means is an auxiliary magnetic pole opposed to the permanent magnet and provided rotationally symmetrically near the electromagnetic pole, and a permanent magnet corresponding to each of the starting magnets at the time of starting. The iron core is rotated by suction of "." According to this solution, as an activation auxiliary means, an auxiliary magnetic pole opposed to the permanent magnet and provided in a rotationally symmetric manner near the electromagnetic pole is provided.
The iron core is rotated by suction with respect to the permanent magnet. Therefore, due to the rotational moment due to the suction,
Despite the position of the dead pole with respect to the permanent magnet, the core in the stationary state can rotate the iron core to a self-startable posture, and when the iron core reaches the self-startable posture, the core remains the same. In the rotation direction, sufficient rotational torque is generated by magnetic repulsion between each electromagnetic pole of the iron core and the opposing permanent magnet, so that the motor can be easily started by itself.

According to a fourth aspect of the present invention, there is provided a two-pole motor wherein the auxiliary magnetic pole is limited to the auxiliary magnetic pole according to the first or third aspect, wherein one of the auxiliary magnetic poles is bent in the direction of the rotation axis while facing one of the permanent magnets. And the other is provided on the outer peripheral side of the armature coil and along the magnetic flux generation direction of the armature coil. " According to this solution, since the other of the auxiliary magnetic poles is provided on the outer peripheral side of the armature coil and along the magnetic flux generation direction of the armature coil, the auxiliary magnetic pole has an iron core excited by the armature coil. A magnetic pole having a different polarity from each of the electromagnetic poles is generated. On the other hand, the one of the auxiliary magnetic poles serves as a magnetically acting portion for the permanent magnet. Therefore, this portion is bent in the direction of the rotation axis while facing the permanent magnet. Can be made as large as possible, whereby a large rotational moment of attraction to the permanent magnet can be obtained, so that the self-starting of the motor is further facilitated.

A two-pole motor according to a fifth aspect further defines the auxiliary pole according to the fourth aspect, wherein each of the two ends has the shortest gap facing the permanent magnet and the electromagnetic pole and the permanent magnet. Is set to be larger than the shortest gap between the two. " According to this solution, at both ends of the auxiliary magnetic pole, the shortest gap facing the permanent magnet is set to be larger than the shortest gap between the electromagnetic pole and the permanent magnet. However, it is relatively smaller than that of the electromagnetic pole with respect to the permanent magnet.
For this reason, in a stationary state where power is not supplied, the iron core is attracted and held in a posture facing the permanent magnet such that the geometric center of the electromagnetic pole and the magnetic center of the permanent magnet are on the same straight line. As a result, the appearance is further improved, and the iron core does not tilt, so that foreign matter does not enter the gap between the electromagnetic pole and the permanent magnet and rotation does not occur.

[0017]

As described above, according to claim 1,
According to the pole motor, an auxiliary magnetic pole having a polarity different from that of the electromagnetic pole is provided, and when energized, the iron core is rotated to a self-startable posture by the attraction to the permanent magnet. Even when the magnet is at a dead point or a position close to the dead point with respect to the magnet, the magnet can be reliably started without giving an external assisting force. In addition, foreign matters are prevented from being mixed into the gap between the iron core and the permanent magnet, and rotation failure is reduced. On the other hand, it is not necessary to tilt the iron core or displace the iron core and the permanent magnet, and the appearance is good. Therefore, it can be suitably used as a learning material.

In the two-pole motor according to the second aspect of the present invention, since the start-up assisting means capable of rotating the iron core to a posture capable of self-starting is provided, the position where the electromagnetic pole becomes a dead center with respect to the permanent magnet in a stationary state is provided. Despite being held in
Self-start can be easily performed by energization. Further, as in the case of the first aspect, it can be suitably used as a reduction in rotation failure and as a learning teaching material.

In the two-pole motor according to the third aspect of the present invention, the auxiliary magnetic pole is used as the start-up assisting means, and at the time of start-up, the iron core is rotated by suction with respect to the permanent magnet so as to be in a self-startable posture. In spite of the position of the dead center of the pole relative to the permanent magnet, self-starting can be easily performed with a simple configuration. In the two-pole motor according to the fourth aspect, the auxiliary magnetic pole is provided on the outer peripheral side of the armature coil along the direction in which the magnetic flux is generated, and a magnetic pole having a different polarity from each of the electromagnetic poles is generated in the auxiliary magnetic pole. Since the auxiliary magnetic pole is provided to bend in the direction of the rotation axis while facing the permanent magnet, the magnetic action area can be made as large as possible for the permanent magnet, and the self-starting of the motor is further facilitated.

In the two-pole motor according to the fifth aspect, both ends of the auxiliary magnetic pole have the shortest gaps facing the permanent magnet, respectively.
Because it is set to be larger than the shortest gap between the electromagnetic pole and the permanent magnet, in addition to the self-starting easiness of the above claims,
In the present two-pole motor, the core is not tilted by the magnetic attraction to the permanent magnet in the stationary state where power is not supplied, the appearance is improved, and foreign matter is prevented from being caught between the permanent magnet and the electromagnetic pole.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-pole motor according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall perspective view of a two-pole motor, showing a state where the motor is housed in a housing (not shown). FIG. 2 is a schematic front view of the two-pole motor of FIG. 1 as viewed from the lower right side, and details of bearings, brushes, and the like are not shown. FIG. 3 is an enlarged perspective view showing the armature of FIG. 1, and FIG. 4 is an exploded perspective view of the armature of FIG.

The housing 1 is formed of a synthetic resin material for teaching materials, for example, as a whole, simulating an automobile body, and a predetermined portion thereof is provided with a two-pole motor of the present invention and a recess for accommodating a dry battery for driving the motor. . A pair of bearings 11a and 11b for rotatably supporting the armature 3 are integrally provided in the housing recess 10 of the two-pole motor in the housing 1,
The shaft supports 31a and 31b of the armature 3 are inserted and supported. Further, a pair of permanent magnets 21a, 21b each having a single pole and having the same shape are attached to the housing 1 with the magnetic pole surfaces facing each other so as to sandwich the armature 3, and have different polarities between the S pole and the N pole. And confront each other. The housing 1 further includes a commutator segment 32 of the armature 3.
a, 32b, a pair of brushes 12a, 12b
The battery is attached in a drooping shape with the sliding contact portion downward, and a lead wire from a dry battery is connected to each electrode terminal.

The armature 3 is, as shown in FIG.
And a pair of frame bodies 35,
36 form the entire outer shape of the armature. Each of the winding frame 34, the frame bodies 35 and 36 is formed of a synthetic resin material, and an engagement / concavo-convex portion made of a combination of concavities and convexities is formed in advance at a portion to be attached and fixed, so that it can be easily assembled manually. It is considered to be.

A cylindrical iron core 4 is coaxially inserted through the inside of the winding frame 34, and an armature winding 33 is wound on the outer surface in a single winding. When the armature winding 33 is excited, both ends 41 a and 41 b of the iron core 4
Electromagnetic poles facing a and 21b. Corresponding to the center of gravity of the iron core 4 of the bobbin 34, shaft supports 31a and 31b are provided at the outer ends of the frames 35 and 36, respectively, so as to protrude outward, and a rotation connecting these shaft supports 31a and 31b is provided. The axis is provided so as to be orthogonal to the longitudinal line of the iron core 4. Of the frames 35, 36, a pair of commutator segments 32a, 32b described above are provided on the outer peripheral surface of the shaft support 31a of the frame 35 on the insertion side, and these resin rings 36, 37 are connected to the shaft support 31a. Is fixed by being externally fitted. Commutator segments 32, 32b
Are connected to coil lead wires drawn out from both ends of the armature winding 33.

Further, the armature 3 is formed with a magnetic bar 5 made of, for example, a wire, bent in a U-shape, attached to the armature winding 33 and straddling the armature winding 33. Fixed. That is, the magnetic bar 5 has a U-shape.
The center portion 51c and bent portions 51a and 51b at both ends bent substantially at a right angle from the center portion 51c. The magnetic bar 5 is fixed to the armature 3 by bending portions 51a and 51b, respectively.
Is inserted into the holes 35a and 35b of the insertion-side frame 35. Also, the mounting state of the magnetic rod 5 is such that the central portion 51c is brought close to or in contact with the outer peripheral side of the armature winding 33 while being aligned with the magnetic flux generation direction of the armature winding 33, and the bent portions 51a and 51b are Near the corresponding electromagnetic poles 41a and 41b,
It is provided so as to face the permanent magnets 21a and 21b on the rear side in the rotation direction from the a and 41b, that is, on the side opposite to the rotation direction. Therefore, the bent portions 51a, 51 of the magnetic rod 5
b are the permanent magnets 21a and 21 from the central portion 51c, respectively.
b, and is bent in the direction of the rotation axis.

The magnetic bar 5 is, as described above,
1c is provided along the direction of magnetic flux generation of the armature winding 33 and near or in contact with the outer peripheral side of the armature winding 33, so that both ends thereof are excited by the excitation of the armature winding 33. Magnetic poles that are different from the neighboring electromagnetic poles 41a and 41b are generated in the bent portions 51a and 51b, respectively. Therefore, the bent portions 51a and 51b are connected to the electromagnetic poles 4 in the armature 3.
In the vicinity of each of the rotation delay sides 1a and 41b, the auxiliary magnetic poles are arranged in a rotationally symmetrical manner, and can be a start-up assisting means that enables the motor to be started later.

The two-pole motor of the present invention has the above-described structure, and the rotatably provided armature 3 is, as shown in FIG.
1b is held in a substantially horizontal posture. That is, the armature 3 is connected to the permanent magnets 21a and 21b in such a manner that the geometric centers of the both ends 41a and 41b serving as the electromagnetic poles of the armature core 4 and the magnetic centers of the permanent magnets 21a and 21b substantially coincide with each other. It is sucked and held between. Strictly, the bent portions 51a and 51b of the magnetic bar 5 are also attracted by the permanent magnets 21a and 21b facing each other, and thus tend to be slightly inclined. However, in the present two-pole motor, the bent portions 51a and 51b of the magnetic bar 5 have the shortest gaps with the permanent magnets 21a and 21b facing the magnetic poles 41a and 41b.
Is larger than the shortest gap between the permanent magnets 21a and 21b, the magnetic acting force of the bent portions 51a and 51b on the permanent magnets 21a and 21b is reduced.
a, 21b are relatively smaller than those of the electromagnetic poles 41a, 41b. Therefore, the armature 3 can be in a substantially horizontal state at the time of rest without energization. Although the specific specifications of the two-pole motor in the present embodiment will be described later, the radial dimension between the bent portion 51a (51b) and the permanent magnet 21a (21b) is 5 mm, and the electromagnetic pole 41a (41b) and the permanent magnet 21a (21
The gaps with b) are each set to 1 mm.

In such a two-pole motor, in the stationary state where no current is supplied as described above, the posture of the armature 3 is
The position of the dead center is located with respect to a and 21b. In the second embodiment,
In a polar motor, the commutator segments 32 in this state
a, 32b are not short-circuited to the brushes 12a, 12b.
It is arranged with a slight deviation on the shaft support 31a, and at the start of energization, as shown in FIG.
On the pole, 41a is electrically wired so as to be excited to the S pole.

Therefore, with the above configuration, the two-pole motor of the present invention is self-started by being energized, even though the armature 3 is held at a position where it becomes a dead center when the armature 3 is at rest, and starts as follows. Works. As shown in FIG. 2, when the motor is energized, the armature coil 33 is excited and the electromagnetic pole 41 is excited.
An N pole is generated at b and an S pole is generated at 41a. At the same time, an S pole is generated at the bent portion 51b of the magnetic rod 5 serving as an auxiliary magnetic pole, and an N pole is generated at the bent portion 51a. Before the energization is started, the armature 3 is at the dead center position with respect to the permanent magnets 21b and 21a as described above.
The magnetic polarities of the permanent magnets 21 b and 41 a are opposite to each other.
b, 21a have the same polarity and no rotational torque is generated,
Permanent magnet 21 facing bent portions 51b and 51a, respectively
The armature 3 has a different polarity from b and 21a, and the armature 3 rotates clockwise by a rotational moment due to suction as shown in the figure. When the armature 3 is tilted at a predetermined angle with respect to the permanent magnets 21b and 21a by this rotation, the dead center position is eliminated and
A sufficient rotational torque is generated by the magnetic repulsion between the electromagnetic poles 41b, 41a of the iron core 4 and the permanent magnets 21b, 21a facing each other, and starts rotating in the same direction as the initial rotation direction. Starts up at the same time.

As described above, in the two-pole motor of the present invention, the armature 3 (iron core 4) is at or near the dead center with respect to the permanent magnets 21a and 21b, which are field magnets, in the stationary state where power is not supplied. Even in the posture, it can be started reliably. Therefore, even if individual parts are exposed as the cost of the motor is reduced and the motor is used as a teaching material, the gap between the permanent magnet and the electromagnetic pole is increased due to the tilting of the armature 3 as in the related art. In the meantime, there is no possibility that foreign matter adheres during rotation and rotation failure does not occur, and the teaching material conforms to the original configuration and does not impair the appearance.

As apparent from the above, the bent portion 51
a, 51b are the electromagnetic poles 41a, 41b of the armature 3;
Are arranged rotationally symmetrically in the vicinity of the rotation delay side, so that the bent portions 51a and 51b are positioned on the opposite side of the rotation starting direction. By reversing, in addition, commutator segments 32a, 32b and brushes 12a, 12b
If the commutation timing is good, the rotation direction can be easily changed.

The degree of delay between the electromagnetic poles 41a and 41b and the auxiliary magnetic poles (bent portions 51a and 51b) positioned on the rotation delay side is such that the greater the rotation angle position, the greater the inclination of the armature 3. However, on the other hand, a high rotational moment is required due to the attraction with the permanent magnet. However, it is sufficient to improve the magnetic flux density between the auxiliary magnetic pole and the permanent magnet. Then, the material, size, shape, and the like of the permanent magnet and the auxiliary magnetic pole may be appropriately selected according to the magnetic characteristics, and a combination thereof may be appropriately selected so as to obtain predetermined characteristics.

The two-pole motor of this embodiment uses, for example, pure iron having a diameter of 7 mm and a length of 32 mm for the armature core 4.
The permanent magnet 21a (21b) has a thickness of about 7mm and 16m
A square ferrite of mx22 mm is used, a radial gap between the electromagnetic poles 41a (41b) and the permanent magnets 21a (21b) is set to about 1 mm, and rotation directions of the bent portions 51a and 51b, which are auxiliary magnetic poles, respectively. Delay angle of about 40
Degrees, the diameter is 1.6 mm, and the bent portion 51a (51
b) The length is 18.5 mm, and the length of the central portion 51c is 30 mm of pure iron. The armature coil 33 uses a copper wire having a diameter of 0.29 mm wound 200 turns. Further, a bent portion 51 which is an auxiliary magnetic pole
a, 51b and the permanent magnets 21a (21
The radial gap with b) is set to about 5 mm.

In this embodiment, both ends formed by bending one magnetic bar 5 are bent 51a, 51b.
Since b is an auxiliary magnetic pole, the structure is simplified and the space is saved. On the other hand, the bent portions 51a and 51b are bent in the direction of the rotation axis with respect to the permanent magnets 21a and 21b to provide these permanent magnets 21a. , 21b can be made as large as possible irrespective of the space saving, and the self-starting is improved. Instead of this one magnetic bar, bent portions 51a, 51b
May be formed using different magnetic members. At that time, each bent portion 51a, 51b has
What is necessary is just to provide the site | part corresponding to the center part 51c. That is, the portion corresponding to the central portion 51c is a portion that is in the direction of generation of the magnetic flux of the armature coil and that is close to or in contact with the armature coil, and is a portion that is excited by the armature coil. As described above, the portion corresponding to the central portion 51c is provided in the direction in which the magnetic flux of the armature coil is generated. However, the portion is not necessarily parallel to the armature coil, and may not be parallel to the armature coil. On the other hand, there may be some deviation.

Although the embodiment of the two-pole motor according to the present invention has been described above, the above-described auxiliary magnetic pole can be formed in various shapes instead of the bent portions 51a and 51b. The action part is a permanent magnet 21a,
The electromagnetic poles 41a, 41
In the vicinity of b in the rotation direction delay side, it is only necessary that electromagnetic poles and different polarities are generated, or that they are attracted to the opposing permanent magnets at the time of startup.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a two-pole motor of the present invention.

FIG. 2 is a schematic side view of the two-pole motor of FIG.

FIG. 3 is an overall perspective view of the armature of the present invention.

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is an overall side view of a conventional two-pole motor.

FIG. 6 shows another conventional two-pole motor, in which (a) is a partial perspective view and (b) is a partial side view.

7A and 7B show still another conventional two-pole motor, wherein FIG. 7A is a partial perspective view and FIG. 7B is a partial side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 3 ... Armature 4 ... Iron core 5 ... Magnetic rod 10 ... Housing recess 12a, 12b ... Brush 21a, 21b ... Permanent magnet 32a, 32b ... Commutator segment 33 ... · Armature windings 41a, 41b · · Electromagnetic poles 51a, 51b · · Bent portions (auxiliary magnetic poles) The same reference numerals in the drawings denote the same or corresponding parts.

Claims (5)

[Claims] An armature coil is wound, and an iron core having both ends as electromagnetic poles is rotatably supported between a pair of permanent magnets arranged in different polarities by exciting the armature coil. In a two-pole motor, auxiliary magnetic poles that generate magnetic poles having polarities different from those of the corresponding electromagnetic poles by excitation of the armature coil are provided in the vicinity of a rotation direction delay side of the electromagnetic poles in a rotationally symmetric manner. A two-pole motor, which is disposed. 2. An armature wound with an armature coil and having an electromagnetic pole at both ends by excitation of the armature coil is rotatably supported between a pair of permanent magnets arranged in different polarities. The electromagnetic pole in the state is a two-pole motor that is held in a position facing the permanent magnet such that the geometric center of the electromagnetic pole and the magnetic center of the permanent magnet are substantially on the same straight line. And a start-up assisting means attached to the armature coil for turning the iron core to a self-startable posture by excitation of the armature coil at the time of start-up.
Pole motor. 3. The starting auxiliary means is an auxiliary magnetic pole facing the permanent magnet and provided in the vicinity of the electromagnetic pole in a rotationally symmetric manner, and rotates the iron core by attracting the corresponding permanent magnet at the time of starting. 3. The method according to claim 2, wherein
Pole motor. 4. The auxiliary magnetic pole is provided so that one of the auxiliary magnetic poles is bent in the rotation axis direction while facing the permanent magnet, and the other is on the outer peripheral side of the armature coil and along the magnetic flux generation direction of the armature coil. The two-pole motor according to claim 1, wherein the two-pole motor is provided. 5. The two-pole motor according to claim 4, wherein each of the two end portions has a shortest gap facing the permanent magnet set to be larger than a shortest gap between the electromagnetic pole and the permanent magnet.