JP2011259680A - Two-phase hybrid rotary electrical machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a two-phase hybrid rotary electrical machinery that has a step angle of 4.09 degrees and achieves high speed and high efficiency operation at low cost.SOLUTION: Two-phase hybrid rotary electrical machinery includes a stator in which two or more main poles of a stator core have two phase windings and a rotor that is rotatably provided on the stator via an air gap and configured to support, by a rotor shaft, a rotor element composed of a pair of rotor magnetic poles made of magnetic material and a permanent magnet that is interposed between both the rotor magnetic poles and magnetized in an axial direction. On an outer peripheral surface of each rotor magnetic pole, two or more magnetic teeth are formed at a regular pitch. The pair of rotor magnetic poles is arranged by shifting each magnetic tooth for half a pitch in a circumferential direction. A step angle of the rotor is set so as to be 4.09 degrees. A metal bearing is used for a bearing to support the rotor shaft.

Description

  The present invention relates to a two-phase hybrid type rotation such as a stepping motor provided with a stator having two-phase windings on a plurality of main poles which are winding poles, and a rotor having a hybrid type rotor element. It relates to electric machinery.

  2. Description of the Related Art Conventionally, stepping motors have been widely used in driving parts including information equipment fields such as printers, facsimiles, and copying machines, and industrial equipment fields such as FA equipment. In recent years, the total demand for stepping motors has been increasing year by year, and their applications have been widespread. Accordingly, there has been an increasing demand for compact motor design and cost reduction that can contribute to the equipment side. Small, inexpensive, high-speed, high-torque, and low-vibration rotations are required for rotating electrical machines such as stepping motors frequently used in office automation equipment such as copying machines and printers.

  As this type of stepping motor, for example, in the case of a hybrid type using a magnetic body and a permanent magnet for the rotor, ones having a configuration shown in Japanese Patent Laid-Open No. 3-212149, Japanese Utility Model Laid-Open No. 55-24020, etc. are frequently used. ing. In other words, a stator is formed by winding a plurality of main poles that protrude radially inward from an annular magnetic body frame, and a shaft is formed between the pair of magnetic bodies via an air gap. It is configured by facing a hybrid rotor configured to sandwich a permanent magnet magnetized in the direction.

  In the stepping motor described above, a step angle of 1.8 ° is often used. However, in order to maintain and control the step angle with high accuracy, a step angle between the stator and the rotor is used. It is required to manage the air gap of 0.05 mm, for example. For this reason, a metal bush such as aluminum is fixed to a motor case that supports the stator, a ball bearing is held on the bush, and the rotor shaft of the rotor is rotated and supported with high precision by the ball bearing. Yes.

JP-A-3-212149 Japanese Utility Model Publication No. 55-24020

  However, in the conventional configuration described above, it is necessary to use a metal bush or a ball bearing in order to secure a minute air gap between the stator and the rotor, which increases the cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a two-phase hybrid rotary electric machine such as a stepping motor that is inexpensive and enables high-speed and high-efficiency operation.

In order to achieve the above object, in the two-phase hybrid electric rotating machine of the present invention, a substantially annular core back part, and a plurality of protrusions formed radially inwardly from the core back part, are formed at the respective tips. A stator core comprising a plurality of main poles forming inductor teeth, and a two-phase winding wound around each main pole of the stator core;
The stator is rotatably provided through an air gap. The rotor shaft includes a pair of rotor magnetic poles made of a magnetic material and a permanent magnet sandwiched between the rotor magnetic poles and magnetized in the axial direction. A rotor configured to support the rotor element;
A plurality of magnetic teeth are formed at an equal pitch on the outer peripheral surface of each rotor magnetic pole, and a pair of rotor magnetic poles are arranged such that each magnetic tooth is shifted by 1/2 pitch in the circumferential direction,
The step angle of the rotor is set to 4.09 °, and a metal bearing is used as a bearing for supporting the rotor shaft of the rotor.

In the rotor having the above-described configuration, two pairs of rotor elements are provided on the common rotor shaft so as to be close to each other, and the tooth positions of the adjacent rotor magnetic poles of both rotor elements are the same in the circumferential direction and the same polarity. You may comprise so that it may be magnetized.

Further, the stator core of the stator has eight main poles at equal intervals in the circumferential direction, and each main pole has three inductor teeth at equal intervals and symmetrical with respect to the center line of the main pole. It is good to arrange and configure.

In this case, it is desirable that the stator core is configured by rotating and laminating 90 ° of magnetic iron plates one by one. Further, the rotor has a structure in which the number of magnetic teeth of the rotor magnetic poles is set to 22 so that 44 It is good to set to a polar configuration.

In addition, in the two-phase hybrid electric rotating machine of the present invention, resin bearing holding members that hold metal bearings may be attached to the cover members that are located on both sides in the axial direction of the stator. Each of the bearing holding members held by the cover members and the metal bearing held by the cover members may be made of the same member.

  By setting the step angle of the rotor to 4.09 °, the rotation angle of the rotor that rotates each time the coil is excited by the input pulse signal is smaller than that of a general-purpose product having a step angle of 1.8 °. As the size increases, the rotor can be rotated at a high speed. Increasing the speed of the rotor means that the efficiency of the motor is increased by increasing the rotational speed. On the other hand, the efficiency of the motor is also a value depending on the air gap, and it is well known that the efficiency decreases as the air gap increases. However, considering this point, the motor efficiency can be increased by increasing the speed. For this reason, even if the air gap is widened, the efficiency of the motor can be secured to the same level as in the conventional case.

  In other words, since the motor output can be made equivalent to that of the conventional one without maintaining the air gap with high accuracy, an inexpensive sliding bearing, that is, a metal bearing can be used as a bearing for supporting the rotor. It becomes possible, and a significant cost reduction can be realized.

1 is a cut front view showing a two-phase hybrid electric rotating machine according to an embodiment of the present invention. It is a top view of the rotary electric machine of FIG. It is a top view which shows the positional relationship of the stator and rotor of FIG. The bush of FIG. 1 is shown, (a) is a front view, (b) is a cutting | disconnection front view. It is the partial front view seen from the X arrow of FIG. It is an enlarged view of FIG. 5, (a) is a front view, (b) is a cut side view. FIG. 6 is a cut front view showing a two-phase hybrid rotating electrical machine according to another embodiment of the present invention.

  An embodiment of a two-phase hybrid electric rotating machine according to the present invention will be described below with reference to the drawings.

  1 and 2 show the overall configuration of a two-phase hybrid (HB) type stepping motor which is an example of the present invention. FIG. 1 is a cut front view, FIG. 2 is a plan view, and FIG. FIG. 2 is a view showing a configuration of a main part of a motor and a combination of a stator having a main pole number of 8 and an HB type rotor as viewed from the axial direction, and illustration of windings is omitted; The neck, which is the winding pole of the main pole, is each wound, and the windings wound around every other four main poles are connected to form one phase, and the remaining four main poles This is an HB type rotating electrical machine in which another one-phase portion is formed to form a two-phase winding as a whole. The stator is an example of adopting an 8-main pole structure excellent in high speed without generating unbalanced electromagnetic force.

  The stator 10 has an annular core back portion 12a having a substantially regular quadrilateral outer shape, and eight main poles 12b that are radially inwardly protruded from the core back portion 12a and arranged at equal intervals in the circumferential direction. The stator core 12 is composed of two-phase windings 14 (shown in FIG. 1) wound around the main poles 12b, and upper and lower insulating members interposed between the main poles 12b and the windings 14. 16 and 18, and three inductor teeth 12c project from the tip of each main pole 12b which is a wound pole. In each main pole 12b, the three inductor teeth 12c are arranged at equal intervals and at symmetrical positions with respect to the center line of the main pole 12b.

The stator core 12 is configured by laminating a plurality of silicon steel plates. As shown in FIG. 3, four main poles 12b arranged on two lines perpendicular to each other on the vertical axis (X axis) and the horizontal axis (Y axis), that is, four main poles arranged every 90 °. The pole 12b constitutes one phase (A phase, C phase), and the remaining four mechanical angles are separated from each other by 90 °, and the main pole is disposed at a mechanical angle of 45 degrees from the main phase. 12b forms two phases (B phase, D phase). In each phase, the four main poles 12b every 90 ° are excited and driven so as to have different polarities alternately when the winding 14 is energized.

  As shown in FIG. 1, insulating members 16 and 18 are incorporated into the stator core 12 so as to sandwich and cover the neck portions of the main poles 12 b, that is, the winding portions, from both sides in the axial direction. It is wound around each main pole 12b via these insulating members 16,18.

  On the other hand, as shown in FIG. 1, the rotor 20 arranged inside the stator core 12 includes two rotor magnetic poles 24A and 24B fixed to the rotor shaft 22 side by side in the axial direction, and this rotation. A disk-shaped permanent magnet 26 sandwiched between the child magnetic poles 24A and 24B and magnetized in the axial direction. Each of the rotor magnetic poles 24A and 24B is configured by laminating silicon steel plates and the like, and a plurality (22 in this embodiment) of magnetic teeth 25 are provided at equal intervals on the outer periphery thereof. . The pair of rotor magnetic poles 24A and 24B are arranged with a tooth pitch shifted by ½, and the rotor element 28 is constituted by the two rotor magnetic poles 24A and 24B and the permanent magnet 26 sandwiched therebetween. Has been. A knurled portion 22a is formed at a position corresponding to the rotor magnetic poles 24A and 24B of the rotor shaft 22, and the rotor shaft 22 is press-fitted and fixed to the pair of rotor magnetic poles 24A and 24B sandwiching the permanent magnet 26, thereby knurling. In the processed portion 22a, the rotor magnetic poles 24A and 24B are prevented from rotating and are firmly fixed. The permanent magnet 26 is composed of, for example, a ferrite magnet. Of course, other magnet materials, rare earth magnets such as neodymium can also be used.

Since the number of teeth of the magnetic teeth 25 of the rotor magnetic poles 24A and 24B is 22, the rotor magnetic tooth pitch is 360 ° / 22 = 16.36 °, and the step angle is a two-phase machine. The value is equally divided and is 4.09 °. That is, this motor is of the HB type, and as is clear from the above, if one rotor magnetic pole 24A shown in FIG. The magnetic teeth 25 of the other rotor magnetic pole 24 </ b> B magnetized to the N pole are separated from each other in the axial direction by the thickness of the permanent magnet 26. Accordingly, the pitch between the N pole and the S pole of the magnetic teeth 25 as the rotor element 28 is 8.18 °, and the value obtained by dividing this value by the number of phases is the step angle, so this embodiment is a two-phase machine. The step angle is 4.09 ° as described above.

In FIG. 1, an upper cover 30 and a lower cover 32 are disposed on both sides in the axial direction of the stator 10 (referred to as upper and lower sides for convenience), and the motor cover is mounted together with the outer peripheral surface of the stator core 12 of the stator 10. It is composed. The outer shapes of the covers 30 and 32 are each formed in a substantially regular quadrilateral shape like the stator core 12. The lower cover 32 includes a bottom plate portion 32a constituting a bottom surface, a quadrilateral outer frame portion 32b, and an inner frame portion 32c formed concentrically with the rotor shaft 22, and is integrally formed with a resin such as PPS or PBT. Has been. The lower cover 32 is fixed to the stator 10 in a state where the end surface of the outer frame portion 32 b is in contact with the lower surface of the stator core 12. As this fixing method, for example, a part of the lower insulating member 18 and a part of the lower cover 32 are closely opposed to each other over a plurality of locations on almost the entire circumference, and an ultrasonic wave is applied between the two so-called supersonic waves. It is fixed by sonic welding. The lower cover 32 covers the insulating member 18 and the winding 14 that are led out from the lower surface of the stator core 12.

  A terminal portion for connection to the outside is provided on one side of the lower cover 32 described above. That is, as shown in FIGS. 1 and 2, a part of the outer frame portion 32b of the lower cover 32 is cut out, and a receiving portion 32d extending laterally is formed on the bottom plate portion 32a at this position. A circuit board 36 is attached to the lower insulating member 18 by using a pin (kage pin) planted on the insulating member 18, and the end of the winding wire 14 is tangled and soldered to the pin. Thus, the circuit board 36 is electrically connected. A part of the circuit board 36 is led out from the outer surface of the stator core 12 and supported by the receiving portion 32d, and a connector 38 is mounted on the circuit board 36 at this position. Therefore, by supplying an external power source and signals using this connector 38, the winding 14 can be energized and controlled.

The upper cover 30 is formed by press-molding a thin metal plate, and includes a top plate portion 30a and a quadrilateral outer frame portion 30b. The center portion of the top plate portion 30a includes a lower cover 32. An opening 30c having an inner diameter substantially equal to the inner diameter of the inner frame portion 32c is formed. The upper cover 30 is fixed to the stator 10 by a caulking technique, which will be described later, with the lower end surface of the outer frame portion 30b in contact with the upper surface of the stator core 12. On the top surface of the top plate portion 30a, a mounting plate 34 having substantially the same outer shape as that formed by stamping a metal plate with a press is fixed by, for example, spot welding. The mounting plate 34 also has an opening 34a at the center thereof that matches the opening 30c of the top plate 30a.

  As is apparent from FIG. 3, axial through holes 12 d are formed at the four corners of the stator core 12 at rotationally symmetric positions every 90 °. The upper and lower upper and lower covers 30 and 32 of the stator core 12 are provided with insertion holes corresponding to the through holes 12d, and the mounting plate 34 is formed with screw holes 34b corresponding to the insertion holes. ing. When the motor is mounted, the bolts passed through the through holes 12d and the insertion holes are screwed into the screw holes 34b of the mounting plate 34.

  Bearing bushes 40A and 40B are attached to inner peripheral portions on both axial sides of the stator core 12, and metal bearings 42A and 42B for rotatably supporting the rotor shaft 22 are held on the bushings. The bearing bushes 40A and 40B are of the same shape and are formed of a resin such as PPS, and have a structure as shown in FIG. That is, a stepped fitting portion 40b having an outer diameter substantially equal to the inner diameter of the inductor teeth 12c in each main pole 12b of the stator core 11 is formed at the lower portion of the annularly formed main body portion 40a. A cover support surface 40c is formed on the end surface of the outer peripheral portion of 40a, an inlay portion 40d protruding outward in the axial direction is provided inside the cover support surface 40c, and a bearing holding surface is provided on the inner periphery of the main body portion 40a. 40e is formed, and the cover part 40f extended inwardly is provided in the spigot part 40d side of this bearing holding cylinder surface 40e. The outer peripheral surface of the fitting portion 40b, the outer peripheral surface of the spigot portion 40d, and the bearing holding surface 40e are formed concentrically.

  Metal bearings 42A and 42B are fixed to the bearing holding surfaces 40e of the both bearing bushes 40A and 40B by press fitting inside. Both bearing bushes 40A and 40B are attached to the stator core 12 from both sides in the axial direction with the respective fitting portions 40b facing each other. That is, the fitting portions 40b of the bearing bushes 40A and 40B are fitted to the inner diameters of the inductor teeth 12c in the main poles 12b of the stator core 12, and the respective stepped surfaces are used as the end faces of the stator core 12. The bearing bushes 40A and 40B are attached to each other by being brought into contact with each other, and the alignment of the bearing bushes 40A and 40B with respect to the stator core 12 is performed by the fitting surface (outer peripheral surface) of the fitting portion 40b. It will be regulated by the surface. The metal bearings 42A and 42B are oil-impregnated sleeves obtained by impregnating a sintered porous metal with a lubricant, for example.

  The lower bearing bush 40 </ b> B is simultaneously fixed by fixing the lower cover 32 to the stator core 12. That is, when the bearing bush 40B is attached by fitting its fitting portion 40b inside each main pole 12b of the stator core 12, the main body portion 40a is fitted to the inner peripheral surface of the lower insulating member 18. The lower case 32 is disposed below the stator 10 in this state. At this time, when the upper end surface of the outer frame portion 32b of the lower case 32 comes into contact with the lower surface of the stator core 12, the upper end surface of the inner frame portion 32c of the lower case 32 comes into contact with the mounting support surface 40c of the bearing bush 40B. . Then, by fixing the lower cover 32 to the insulating member 18 by ultrasonic welding, a state in which the bearing bush 40 </ b> B partially fitted and held in the stator core 12 is sandwiched between the stator core 12 and the lower cover 32. And is securely fixed. The inlay portion 40 d of the lower bearing bush 40 </ b> B is loosely fitted into the inner frame portion 32 c of the lower cover 32, and the tip thereof is accommodated in the inner frame portion 32 c without being led out from the lower cover 32.

  The upper bearing bush 40 </ b> A is attached to the stator core 12 after the rotor 20 is incorporated into the stator 10, and is fixed simultaneously by fixing the upper cover 30 to the stator 10. That is, the rotor 20 is inserted into the inner side of the stator core 12 of the stator 10 to which the lower bearing bush 40B and the lower cover 32 are fixed, and the lower portion of the rotor shaft 22 of the rotor 20 is connected to the bearing bush 40B. The rotor magnetic poles 24 </ b> A and 24 </ b> B of the rotor 20 are inserted into the inner side of the held metal bearing 42 </ b> B so as to face the inner surfaces of the main poles 12 b of the stator core 12. Thereafter, the bearing bush 40A holding the metal bearing 42A is inserted into the metal bearing 42A from the upper end of the rotor shaft 22 with the fitting portion 40b facing downward, and the fitting portion 40b is inserted into the stator. The core 12 is fitted inside the main pole 12b. After the fitting portion 40 b of the bearing bush 40 </ b> A is fitted to the stator core 12, the upper cover 30 is fixed to the stator core 12.

  When the upper cover 30 is fixed to the stator core 12, the lower end surface of the outer frame portion 30b of the upper cover 30 is brought into contact with the upper surface of the stator core 12, and at the same time, the upper cover is attached to the mounting support surface 40c of the bearing bush 40A. Since the 30 top plate portions 30a come into contact with each other, the bearing bush 40A is sandwiched between the stator core 12 and the upper cover 30 and is securely fixed. At this time, the spigot portion 40d of the bearing bush 40A is loosely inserted into the opening 30c of the top plate portion 30a of the upper cover 30 and the opening 34a of the mounting plate 34, as shown in FIG. Projects from the top surface. Therefore, by using the lead-out portion of the inlay portion 40d, the rotor shaft 22 can be accurately matched with the input portions of various devices when the motor is attached to various devices.

  Next, the fixing of the upper cover 30 to the stator 10 will be described. As described above, the quadrilateral upper cover 30 has the top plate portion 30a and the outer frame portion 30b. However, the fixing piece 30d as shown in FIG. 5 is integrated with the outer frame portion 30b corresponding to the four corners of the quadrilateral. And extended downward. As clearly shown in FIG. 6A, a hole 30e is provided near the lower portion of the fixed piece 30d, and a portion below the hole 30e of the fixed piece 30d is a caulking action portion 30f. Two tapered surfaces 30e1 and 30e2 are formed on the inner lower edge of the punch hole 30e so that the center position is lowest. The stator core 12 corresponding to the lower portion of the fixed piece 30d is provided with a concave portion 12e having a square opening on the outer surface. Here, the upper edge of the recess 12e is partly on the tapered surfaces 30e1 and 30e2 of the hole 30e of the fixing piece 30d in a state where the lower end surface of the outer frame portion 30 of the upper cover 30 is in contact with the upper surface of the stator core 12. It is arranged to cross.

  When the upper cover 30 is fixed to the stator 10, as described above, after the upper bearing bush 40A is attached to the stator 10, the upper cover 30 is placed on the stator 10 below the outer frame portion 30b. The end surface is arranged in contact with the upper end surface of the stator core 12, and then the central portion of the action portion 30f of each fixing piece 30d located at the four corners of the upper cover 30 is stamped inward from the outside. That is, a part of the action part 30f is deformed and inserted into each of the recesses 12e, and the upper cover 30 is caulked and fixed.

  At this time, part of the action portion 30f of the fixed piece 30d enters the concave portion 12e of the stator core 12 to prevent the upper cover 30 from being detached and prevented from falling off. In the case of the structure of the present embodiment, the upper cover is particularly preferable. 30 strong fixations are realized. That is, as can be seen from FIGS. 6A and 6B, the tapered surfaces 30e1 and 30e2 of the lower edge of the punch hole 30e in the fixed piece 30d, that is, the upper edge tapered surface of the action portion 30f is the concave portion 12e of the stator core 12. When the action portion 30f is deformed into the recess 12e, a downward pulling force is generated in the fixed piece 30d as the upper edge tapered surface of the action portion 30f enters the recess 12e. As a result, the upper cover 30 can be pressed against the stator core 12, and the pressing forces act at the four corners of the upper cover 30, and the entire upper cover 30 can be firmly fixed to the stator core 12.

  In the stepping motor having the above-described configuration, the step angle that can be rotated by the pulse signal is set to 4.09 °, and the rotation angle is set larger than that of the general 1.8 °. Therefore, it can be rotated at this speed. That is, it can be said that the embodiment is a stepping motor capable of increasing the speed. Since the output of the motor is proportional to the product of the rotation speed and the torque, the output increases as a result of this increase in speed, resulting in increased efficiency.

  On the other hand, unlike the conventional stepping motor, metal bearings 42A and 42B are used as bearings for the rotor 20 in the stepping motor described above. Since these types of metal bearings 42A and 42B are so-called sliding bearings, the air gap between the stator and the rotor is set to be slightly larger than the air gap in the case of a ball bearing. In this case, the air gap between the stator and the rotor affects the efficiency of the motor, and the efficiency tends to decrease as the air gap increases. However, in the above embodiment, since the speed is increased and the efficiency is increased by setting the step angle, even if the metal bearings 42A and 42B are used as the bearings, the efficiency decreases. As a result of improving the efficiency only to compensate, a stepping motor that exhibits an efficiency equal to or higher than the conventional case can be obtained.

  Here, the stator core 12 is configured by laminating a predetermined number of silicon steel plates, and adopts a method of laminating the silicon steel plates that are press-punched into a predetermined shape one after another by 90 °. As a result, it is possible to obtain the effect of suppressing variation in the permeance vector. That is, since the stator core 12 shown in FIG. 3 has a 90 ° point symmetrical structure, the permeance vector due to a slight difference in the size of the punching die or a difference in the thickness of the silicon steel plate can be obtained by rotating and overlapping the 90 °. This variation can be canceled.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. In FIG. 7, the same reference numerals as those described above denote the same or corresponding ones. In FIG. 7, a so-called twin magnet type HB type rotor is adopted as the rotor 20 ′, and the stator 10 ′ is configured in accordance with the axial length of the rotor 20 ′.

  That is, the stator 10 ′ is different from the one shown in FIG. 1 in a stator core 12 ′ configured by laminating a plurality of silicon steel plates. The shaft length is formed. In this case as well, by adopting a method in which silicon steel plates that have been punched into a predetermined shape are successively rotated by 90 ° and laminated, variations in permeance vectors can be eliminated and balanced.

The rotor 20 ′ is an HB type rotor configured using a rotor element in which a permanent magnet is sandwiched between a pair of rotor magnetic poles. In this embodiment, two rotor elements are used. It is configured. That is, the rotor 20 ′ includes four rotor magnetic poles 24AX, 24BX, 24BY, and 24AY fixed to the rotor shaft 22 ′ in the axial direction, and between the pair of rotor magnetic poles 24AX and 24BX and 24BY and 24AY. The disk-shaped permanent magnets 26X and 26Y sandwiched between each other and magnetized in the axial direction. Each of these rotor magnetic poles is formed by laminating silicon steel plates and the like, and a plurality (22 in this embodiment) of magnetic teeth 25X and 25Y are provided on the outer periphery of each of the rotor magnetic poles.

The pair of rotor magnetic poles 24AX, 24BX are arranged with a tooth pitch offset by 1/2, and a permanent magnet 26X is sandwiched between them. Similarly, the pair of rotor magnetic poles 24AY, 24BY have a tooth pitch of 1 / The permanent magnets 26Y are sandwiched between the two. The permanent magnets 26X and 26Y are set so that the magnetization directions are opposite to each other. The rotor magnetic poles 24AX and 24BX magnetized by the permanent magnet 26X and the rotor magnetic poles 24AY and 24BY magnetized by the permanent magnet 26Y Among them, the adjacent magnetic poles 24BX and 24BY facing each other are set to have the same polarity. At this time, the tooth positions in the circumferential direction of the adjacent rotor magnetic poles 24BX and 24BY are the same position. The rotor magnetic poles 24AX and 24BX and the permanent magnet 26X constitute a rotor element 28X, and the rotor magnetic poles 24AY and 24BY and the permanent magnet 26Y constitute a rotor element 28Y. Although FIG. 7 shows a state where the rotor elements 28X and 28Y are adjacent to each other without a gap, the rotor elements 28X and 28Y may be adjacent to each other with a slight separation in the axial direction.

  The magnetic teeth 25X, 25Y of the rotor magnetic poles 24AX, 24AY, 24BX, 24BY of the rotor elements 28X, 28Y are opposed to the inductor teeth of the main poles of the stator 10 'in the radial direction via air gaps. To do. A rotor 20 ′ in which two rotor elements 28X and 28Y are supported by a common rotor shaft 22 ′ is a metal of bearing bushes 40A and 40B in which the rotor shaft 22 ′ is provided on both axial sides of the stator 10 ′. By being supported by the bearings 42A and 42B, the bearings 42A and 42B are rotatably supported. As in the case of the first embodiment, the bearing bushes 40A and 40B are attached to the stator 10 'by fixing the upper cover 30 and the lower cover 32 to the stator 10'.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained.

  The two-phase hybrid electric rotating machine according to the present invention is capable of high-speed rotation, achieves high efficiency, and can reduce the cost by adopting a metal bearing. As a stepping motor, a copying machine that is an OA machine, It is possible to provide an inexpensive, high-speed, high-torque, low-vibration rotating electrical machine for printer applications, which is expected to make a significant industrial contribution. In addition, application to medical equipment, FA equipment, robots, amusement machines, and housing equipment is also highly expected.

10, 10 ': Stator 12, 12': Stator core 12b: Main pole 12c: Inductor teeth 14: Winding 20, 20 ': Rotor 22, 22': Rotor shafts 24A, 24B, 24AX, 24BX 24AY, 24BY: Rotor magnetic poles 25, 25X, 25Y: Magnetic teeth 26, 26X, 26Y: Permanent magnets 28, 28X, 28Y: Rotor element 30: Upper cover 32: Lower cover 40A, 40B: Bearing bushes 42A, 42B : Metal bearing

Claims (7)

A substantially annular core back portion, and a stator core comprising a plurality of main poles formed radially inwardly projecting from the core back portion and having a plurality of inductor teeth formed at respective tips; A stator including two-phase windings wound around each main pole of the child core;
A pair of rotor magnetic poles made of a magnetic material, and a permanent magnet sandwiched between the rotor magnetic poles and magnetized in the axial direction, provided rotatably on the stator via an air gap; A rotor configured to support a rotor element consisting of
A plurality of magnetic teeth are formed at an equal pitch on the outer peripheral surface of each rotor magnetic pole, and the pair of rotor magnetic poles are arranged with their magnetic teeth shifted by 1/2 pitch in the circumferential direction. Phase hybrid type rotating electric machine,
A two-phase hybrid rotary electric machine characterized in that a step angle of the rotor is set to 4.09 ° and a metal bearing is used as a bearing for supporting the rotor shaft of the rotor. 2. The rotor according to claim 1, wherein two sets of the rotor elements are provided on a common rotor shaft, and adjacent rotor magnetic poles of the two rotor elements have the same magnetic tooth position in the circumferential direction. A two-phase hybrid rotating electric machine characterized by being magnetized with the same polarity. 3. The stator core according to claim 1, wherein the stator core of the stator has eight main poles at equal intervals in the circumferential direction, and each main pole has three inductor teeth at equal intervals and the center of the main pole. A two-phase hybrid rotating electric machine characterized by being arranged symmetrically with respect to a line. 4. The two-phase hybrid rotating electric machine according to claim 3, wherein the stator core is configured by rotating and laminating magnetic iron plates by 90 ° for each sheet. 4. The two-phase hybrid rotating electric machine according to claim 3, wherein the rotor is set to a 44-pole configuration by setting the number of magnetic teeth of the rotor magnetic poles to 22. 6. The two-phase structure according to claim 1, wherein a resin bearing holding member that holds the metal bearing is attached to the cover member that is positioned on both sides in the axial direction of the stator. Hybrid rotating electric machine.   7. The two-phase hybrid rotation according to claim 6, wherein a common member is used on both sides in the axial direction for the bearing holding member held by each of the cover members and the metal bearing held by the both cover members. Electric.

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