JP3045368U - 2-pole motor - Google Patents

Abstract

(57) [Summary] [Problem] Self-start can be easily performed even at a dead center position without applying an external assist force or holding an armature core in a tilted position in advance while a motor is stationary. To provide a two-pole motor. SOLUTION: An armature coil 33 is wound, and when the coil 33 is excited, an iron core 4 having both ends 41a, 41b as electromagnetic poles is paired with a pair of permanent magnets 21a,
This is a two-pole motor rotatably supported between the motors 21b.
The auxiliary magnetic poles 5 that generate magnetic poles having polarities different from the corresponding electromagnetic poles 41a and 41b by excitation of the armature coil 33 are provided near the electromagnetic poles 41a and 41b on the rotational delay side.
1a and 51b are arranged rotationally symmetrically.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 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.

[0002]

[Prior art]

 As shown in FIG. 5, in a conventional two-pole motor, a pair of permanent magnets b and b are provided in a housing a on the stationary side, the N and S poles facing each other. In addition, a rod-shaped armature core c is rotatably supported. An armature coil d is wound around the armature core c in a single turn, and lead terminals e, e of the armature coil d are respectively connected to a pair of rectifying segments g, g provided on a rotation shaft support f of the iron core. A pair of brushes h, h that are connected and contact with each other so as to sandwich the surfaces of the rectifying segments g, g are attached to the housing a. When a DC voltage is applied to the brushes h and h, the iron core c is excited by the armature coil d, and the magnetic repulsion and magnetic force between the electromagnetic poles c1 and c2 at both ends and the permanent magnets b and b opposed to the cores c and c2. A rotational torque is generated by the dynamic suction action.

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 in which no electricity is supplied. Therefore, as shown in FIG. 5, the iron core c is positioned between the magnets b and b in such a manner that the geometric center of the electromagnetic poles c1 and c2 and the magnetic center of the magnets b and b face substantially the same straight line. Will be retained. Therefore, even if 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 commutating segments g and g are normally short-circuited by the brushes h and h. Therefore, the motor does not start unless the rotational torque is generated or extremely small, and the rotational attitude must be changed by applying some external force to the iron core. In addition, even if the commutation segments g, g are provided so as not to be short-circuited to the brushes h, h at the above-mentioned dead center position, there is no essential solution.

Conventionally, in order to solve such inconveniences, an auto-start function in which, when the motor is stationary, the armature c is held in a posture capable of self-starting with respect to the permanent magnets b, b in advance. Have 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 magnets b, b The magnetic center is shifted so as not to be on the same straight line.

[0005] Specifically, as shown in FIG. 6, magnetic members i, i such as iron pieces are attached to one side in the rotation circumferential direction of the electromagnetic poles c1, c2, respectively, and the iron core c is attached to the stationary state of the motor. The left end of the iron core was inclined to the lower left of the figure. Thereby, the iron core c is easily rotated and started in the counterclockwise direction by energization. Further, in FIG. 7, the magnetic members ii and ii provided on the electromagnetic poles c1 and c2 are integrally formed with the electromagnetic poles to have the same configuration as that of the previous example. It was arranged shifted vertically. Also in this case, the iron core c is tilted to the lower left (the left end of the iron core), so that the attitude 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 stationary, the commutation segments g, g are not short-circuited to the brushes h, h, or are slightly shorted on the rotary shaft support f so as not to short-circuit. It is provided staggered.

[0007]

[Problems to be solved by the invention]

 As described above, since the two-pole motor has a dead center in its structure, it is difficult to start itself and the torque fluctuation is large. Since the structure is simple and the number of parts is small, it is often used as a teaching material for learning the principle of rotation of a motor, for example, in addition to being used for a simple drive device due to its essential configuration. Therefore, such a two-pole motor is usually assembled as a complete product with its individual parts exposed, due to its low cost 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. , 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 for the teaching materials to be able to be self-started in consideration of the effective use after learning, it cannot be said that the teaching materials are not intrinsic and look good.

The present invention has been made in view of such a problem, and its purpose is to provide an external assisting force or to hold an armature core in a tilted position in advance while the motor is stationary. It is an object of the present invention to provide a two-pole motor that can be easily started by itself even at a dead center position.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the two-pole motor according to claim 1 has a structure in which "an armature coil is wound and an iron core having electromagnetic poles at both ends by excitation of the armature coil is arranged in a different polarity. A two-pole motor rotatably supported between a pair of provided permanent magnets, wherein the electromagnetic poles corresponding to the electromagnetic poles are excited near the rotation-direction side of the electromagnetic poles by exciting the armature coils. Auxiliary magnetic poles that generate magnetic poles of different polarities from the poles are arranged rotationally symmetrically. "

According to this solution, an auxiliary magnetic pole is provided in the vicinity of the electromagnetic pole on the delay side in the rotational direction, and the auxiliary magnetic pole is generated by exciting the armature coil with the magnetic polarity of the electromagnetic pole. They were provided to have different polarities. Normally, each electromagnetic pole of the iron core excited by the armature coil when the motor is energized has the same polarity as the opposing permanent magnet, and when the iron core is at or near the dead center with respect to the permanent magnet, Sufficient rotational torque cannot be obtained due to magnetic repulsion, and therefore the motor does not start up. However, as in the above configuration, the magnetic poles generated in the auxiliary magnetic poles by the excitation of the armature coil have different polarities from the respective electromagnetic poles of the iron core generated by the excitation of the same armature coil. 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 suction is the rotational direction in which the motor starts, because the auxiliary magnetic pole is positioned on the side of the iron core that is delayed in the rotational direction. The iron core can be rotated to a self-startable posture by the rotational moment due to the suction. When the iron core reaches a position where it can self-start, a sufficient rotational torque is generated due to the magnetic repulsion between the electromagnetic poles of the iron core and the opposing permanent magnets, and thus the core is rotated and started in the same direction as the initial rotation direction. It can be started substantially simultaneously with energization.

As described above, the two-pole motor of the present invention can be self-started without applying an external assisting force even when the iron core is in a dead center or a position close to the dead center with respect to the permanent magnet in a stationary state where power is not supplied. The iron core can be easily started up without holding the iron core in an inclined position with respect to the permanent magnet in advance. A two-pole motor according to claim 2, wherein the armature coil is wound and an iron core having both ends as electromagnetic poles when excited by the armature coil is rotated between a pair of permanent magnets arranged in different polarities. The electromagnetic pole, which is freely supported and in a stationary state, is 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 substantially on the same straight line. And a start-up auxiliary means that is attached to the armature coil and rotates the iron core to a self-startable position by excitation of the armature coil at the time of start-up. Features.

[0013] According to this solution, there is provided start-up assisting means attached to the armature coil, and when the motor is started, the iron core is rotated to a position in which the core can be self-started by excitation of the armature coil. did. 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 self-start even when the motor is energized. However, since the start-up assisting means is provided as described above, the core can be rotated to a position in which the core can be self-started. , The motor starts automatically. Since the start 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 according to the present invention can be started without any external assisting force in the stationary state where power is not supplied, while the iron core is in a position where it becomes a dead center with respect to the permanent magnet. it can. According to a third aspect of the present invention, there is provided a two-pole motor, wherein the starting auxiliary means is limited to an auxiliary magnetic pole which is provided to face the permanent magnet and to be rotationally symmetric in the vicinity of the electromagnetic pole. The iron core is rotated by the attraction of the corresponding permanent magnet at the time of start-up. " According to this solution, as a starting auxiliary means, an auxiliary magnetic pole facing the permanent magnet and provided in a rotationally symmetric manner near the electromagnetic pole is used, and at the time of starting, the iron core is rotated by suction with respect to the permanent magnet. I did it. Therefore, due to the rotational moment due to the suction, the electromagnetic pole in the stationary state can rotate the core to the self-startable posture regardless of the position of the dead center with respect to the permanent magnet, and the iron core can start itself. When the motor reaches a normal position, sufficient rotational torque is generated by the magnetic repulsion between the electromagnetic poles of the iron core and the opposing permanent magnets in the same direction of rotation. Can be.

According to a fourth aspect of the present invention, in the two-pole motor, the auxiliary magnetic pole according to the first or third aspect is limited. "The auxiliary magnetic pole is bent in the rotation axis direction while one of the auxiliary magnetic poles faces the permanent magnet. 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 the iron excited by the armature coil. Magnetic poles of opposite polarity to each electromagnetic pole of the heart are created. 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. The working area can be made as large as possible, which makes it possible to take a large rotational moment of attraction to the permanent magnets, thereby making it easier to start the motor by itself.

A two-pole motor according to a fifth aspect further defines the auxiliary magnetic pole according to the fourth aspect, wherein each of the two ends has a shortest gap facing the permanent magnet, and the shortest gap between the electromagnetic pole and the permanent magnet. The gap is set larger than the shortest gap with the magnet. " According to this solution, at both ends of the auxiliary magnetic pole, the shortest gap facing each permanent magnet is set to be larger than the shortest gap between the electromagnetic pole and the permanent magnet. However, it becomes 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 no foreign matter enters the gap between the electromagnetic pole and the permanent magnet to cause rotation failure.

[0017]

[Effect of the invention]

 As described above, according to the two-pole motor according to the first aspect, the auxiliary magnetic pole having a polarity different from that of the electromagnetic pole is provided, and when energized, the iron core is turned to a posture capable of self-starting by attracting the permanent magnet. Since the iron core is moved, even when the iron core is at a dead center or a position close to the dead center with respect to the permanent magnet in a stationary state, the iron core can be reliably started without applying an external assisting force. In addition, foreign matter is prevented from entering the gap between the iron core and the permanent magnet, and rotation failure is reduced.On the other hand, the appearance is good because there is no need to tilt the iron core or displace the iron core and the permanent magnet. 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 the stationary state is provided. Despite being kept in the power supply, it can be easily started by self-energization. Further, as in the case of the first aspect, the present invention 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, 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. However, despite the position of the electromagnetic pole at the dead center with respect to the permanent magnet, the 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 a direction in which the magnetic flux is generated, and the auxiliary magnetic pole has a magnetic pole having a different polarity from each electromagnetic pole. Since the auxiliary magnetic poles are bent in the direction of the rotation axis while facing the permanent magnets, the magnetic action area can be made as large as possible for the permanent magnets, and the self-starting of the motor is further facilitated. .

In the two-pole motor according to the fifth aspect, at both ends of the auxiliary magnetic pole, the shortest gaps facing the permanent magnets are set to be larger than the shortest gaps between the electromagnetic poles and the permanent magnets. In addition to the effect of self-starting, which is an effect of the present invention, in the present two-pole motor, in the stationary state where power is not supplied, the core is not tilted by the magnetic attraction to the permanent magnet, and the appearance is improved. Also, it is possible to prevent a foreign substance from being caught between them.

[0021]

[Embodiment of the invention]

 The two-pole motor of 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. Provided. 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, and the shaft supports 31a and 31b of the armature 3 are inserted and supported. You. A pair of permanent magnets 21a and 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. Further, a pair of brushes 12a, 12b that are in sliding contact with the commutator segments 32a, 32b of the armature 3 are attached to the housing 1 in a hanging manner with the sliding contact portions being downwards. The lead wire from the battery is connected.

As shown in FIG. 4, the armature 3 has a winding frame 34 and a pair of frames 35 and 36 assembled so as to sandwich the winding frame 34 to 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 engaging concave / convex portion composed of a combination of concave / convex portions is formed in advance at a portion to be attached and fixed, so that it can be easily manually formed. Considered to be assembled.

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 shape. By the excitation of the armature winding 33, both ends 41a, 41b of the iron core 4 become electromagnetic poles facing the permanent magnets 21a, 21b, respectively. Corresponding to the center of gravity of the iron core 4 of the winding frame 34, shaft supports 31a, 31b are provided at the outer ends of the frames 35, 36, respectively, and project from the outside, and connect these shaft supports 31a, 31b. The rotation axis is provided to be orthogonal to the longitudinal line of the iron core 4. The pair of commutator segments 32a, 32b is provided on the outer peripheral surface of the shaft support 31a of the frame 35 on the insertion side of the frames 35, 36, and these resin rings 36, 37 are provided on the shaft support. It is fixed by being externally fitted to 31a. To the connecting tongues of the commutator segments 32 and 32b, coil lead wires drawn out from both ends of the armature winding 33 are connected.

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. In other words, the magnetic bar 5 has a central portion 51c and bent portions 51a and 51b at both ends bent substantially at right angles from the U-shape, and the magnetic bar 5 is fixed to the armature 3. Is performed by inserting the distal ends of the bent portions 51a and 51b into the holes 35a and 35b of the insertion-side frame 35, respectively. The magnetic rod 5 is attached in such a manner that the central portion 51c is brought close to or in contact with the outer peripheral side of the armature winding 33 while making the central portion 51c along the magnetic flux generation direction of the armature winding 33, and the bent portions 51a and 51b are bent. In the vicinity of the corresponding electromagnetic poles 41a, 41b, the magnets 41a, 41b are provided so as to face the permanent magnets 21a, 21b on the rear side in the rotation direction from the electromagnetic poles 41a, 41b, that is, on the side opposite to the rotation direction. Therefore, the bent portions 51a and 51b of the magnetic rod 5 are bent in the rotation axis direction while facing the permanent magnets 21a and 21b from the central portion 51c, respectively.

As described above, the magnetic bar 5 has the central portion 51 c provided along the direction in which the magnetic flux of the armature winding 33 is generated, and is provided adjacent to or in contact with the outer peripheral side of the armature winding 33. Therefore, when the armature winding 33 is excited, magnetic poles having different polarities from the nearby electromagnetic poles 41a and 41b are generated in the bent portions 51a and 51b at both ends thereof. Therefore, the bent portions 51a and 51b become auxiliary magnetic poles that are arranged rotationally symmetrically in the vicinity of the respective rotation delay sides of the electromagnetic poles 41a and 41b in the armature 3, thereby enabling the motor to be started later. It can be a starting assisting means.

The two-pole motor of the present invention has the above-described configuration, and the rotatably provided armature 3 is in a stationary state in which power is not supplied to the permanent magnets 21a and 21b as shown in FIG. It is held in a substantially horizontal position. That is, the armature 3 and the permanent magnets 21a and 21b are arranged 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 substantially coincide with the magnetic centers of the permanent magnets 21a and 21b, respectively. Suction is held between. Strictly, the bent portions 51a and 51b of the magnetic bar 5 are also attracted by the permanent magnets 21a and 21b opposed to each other, and thus tend to be slightly inclined. However, in this two-pole motor, as shown in the figure, each of the bent portions 51a and 51b of the magnetic rod 5 has the shortest gap between the permanent magnets 21a and 21b opposed thereto and the electromagnetic poles 41a and 41b and the permanent magnets. Since the gap is set to be larger than the shortest gap with 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 larger than that of the electromagnetic poles 41a and 41b on the permanent magnets 21a and 21b. Relatively small. Therefore, the armature 3 can be in a substantially horizontal state when the vehicle is at rest without energization. Although the specific specifications of the two-pole motor in this embodiment will be described later, the radial dimension between the bent portion 51a (51b) and the permanent magnet 21a (21b) is 5 mm. The gap between the pole 41a (41b) and the permanent magnet 21a (21b) is set to 1 mm.

In such a two-pole motor, the posture of the armature 3 is at the position of the dead center with respect to the permanent magnets 21a and 21b in the stationary state where power is not supplied as described above. In the two-pole motor according to the present embodiment, the commutator segments 32a and 32b are arranged so as to be slightly shifted on the shaft support portion 31a so as not to be short-circuited to the brushes 12a and 12b in this state. At the time, as shown in FIG. 2, electric wiring is performed so that the electromagnetic pole 41b is excited to the N pole and the electromagnetic pole 41a is excited to the S pole.

Therefore, with the above configuration, the two-pole motor of the present invention starts up automatically by being energized, even though the armature 3 is held at the dead point in the stationary state. Works like As shown in FIG. 2, when the motor is energized, an N pole is generated at the electromagnetic pole 41b and an S pole is generated at 41a by excitation of the armature coil 33. 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. Since the armature 3 is at the dead center position with respect to the permanent magnets 21b and 21a before the energization is started as described above, the magnetic poles of the electromagnetic poles 41b and 41a due to the energization are set to the permanent magnets 21b and 21a facing each other. Although it has the same polarity and does not generate a rotating torque, the bent portions 51b and 51a and the facing permanent magnets 21b and 21a have different polarities, and the armature 3 is rotated clockwise by the rotating moment due to the attraction as shown in the figure. Rotate. When the armature 3 is tilted at a predetermined angle with respect to the permanent magnets 21b and 21a by this rotation, the position of the dead center is eliminated and the permanent magnets 21b and 21a facing the electromagnetic poles 41b and 41a of the iron core 4, respectively. A sufficient rotational torque is generated by the magnetic repulsive force, so that the motor starts to rotate in the same direction as the initial rotation direction, and starts itself substantially simultaneously with energization.

As described above, in the two-pole motor of the present invention, the armature 3 (iron core 4) is near the dead point or near the dead point with respect to the permanent magnets 21 a and 21 b which are the field magnets in the stationary state where no current is 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 or the motor is used as a teaching material, the gap between the permanent magnet and the electromagnetic pole becomes larger due to the tilting of the armature 3 as in the related art. In addition, no foreign substances are attached during this time, and rotation does not occur. In addition, the teaching material conforms to the original structure and does not impair the appearance.

As is apparent from the above description, the bent portions 51a and 51b are arranged in a rotationally symmetric manner in the vicinity of the rotation delay sides of the electromagnetic poles 41a and 41b in the armature 3, so that The bent portions 51a and 51b are positioned on the opposite side of the rotation starting direction. For example, by reversing the attachment of the magnetic bar 5, the bent portions 51a and 51b are added to the rectifier segments 32a and 32b and the brushes 12a and 12b. If the commutation timing is good, the rotation direction can be easily changed.

The degree of delay between the electromagnetic poles 41 a and 41 b and the auxiliary magnetic poles (bent portions 51 a and 51 b) 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 performed so as to obtain predetermined characteristics.

In the two-pole motor of the present embodiment, for example, pure iron having a diameter of 7 mm and a length of 32 mm is used for the armature core 4, and the permanent magnet 21 a (21 b) has a thickness of about 7 mm and a size of 16 mm × 22 mm. A rectangular ferrite is used, a radial gap between the electromagnetic poles 41a (41b) and the permanent magnets 21a (21b) is set to about 1 mm, and a delay angle of each of the bending portions 51a and 51b as auxiliary magnetic poles in the rotation direction is It is set at about 40 degrees and has a diameter of 1. The length of the bent portion 51a (51b) is 18.5 mm, and the length of the central portion 51c is 30 mm of pure iron. The armature coil 33 is formed by winding a copper wire having a diameter of 0.29 mm for 200 turns. Further, the radial gap between the bent portions 51a and 51b, which are auxiliary magnetic poles, and the opposing permanent magnets 21a (21b) is set to about 5 mm.

Further, in the present embodiment, since both ends formed by bending one magnetic bar 5 are used as the auxiliary magnetic poles as the bent portions 51a and 51b, the configuration is simplified and the space is saved. The bent portions 51a and 51b are bent in the rotation axis direction with respect to the permanent magnets 21a and 21b, so that the magnetic action area for the permanent magnets 21a and 21b can be reduced as much as possible regardless of space saving. The self-starting is good. Instead of the single magnetic rod, the bent portions 51a and 51b may be formed using different magnetic members. At that time, a portion corresponding to the central portion 51c may be provided in each of the bent portions 51a and 51b. That is, the portion corresponding to the central portion 51c is a portion that is in the magnetic flux generation direction of the armature coil and is brought into close proximity 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, but is not necessarily parallel to the armature coil. There is no problem even if there is some deviation from.

Although the embodiment of the two-pole motor according to the present invention has been described above, the above-described auxiliary magnetic pole may be formed in various shapes instead of the bent portions 51a and 51b. The action portion is disposed radially opposite to the permanent magnets 21a and 21b, and is located near the rotation direction delay side of the electromagnetic poles 41a and 41b, and has a different polarity from the electromagnetic poles, or the permanent magnets facing at the time of startup. What is necessary is just to be provided so that it may be sucked in.

[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)

[Utility model registration 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 a rotationally symmetrical manner near the electromagnetic pole, 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.