US20080067889A1 - Multiple phase claw pole type motor - Google Patents
Multiple phase claw pole type motor Download PDFInfo
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- US20080067889A1 US20080067889A1 US11/936,266 US93626607A US2008067889A1 US 20080067889 A1 US20080067889 A1 US 20080067889A1 US 93626607 A US93626607 A US 93626607A US 2008067889 A1 US2008067889 A1 US 2008067889A1
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- claw
- pole
- claw pole
- diameter side
- type motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/145—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having an annular armature coil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
A claw pole type motor includes first and second claw poles opposed to each other and each including a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pole portions arranged on the inner diameter side, and axially extended, and an outer peripheral side yoke portion extending on the outer diameter side. A stator core is provided having an inner diameter side, and is formed so as to cause the pole portions of the first claw pole to be meshed with the pole portions of the second claw pole. A rotor is arranged on the inner diameter side of the stator core with a circumferential gap being defined therebetween. In order to provide high efficiency while simplifying manufacturing, the first and second claw poles are formed by compacting of magnetic powder.
Description
- This application is a continuation of U.S. application Ser. No. 11/781,065, filed Jul. 20, 2007, which is a divisional of U.S. application Ser. No. 11/376,091, filed Mar. 16, 2006, which said application claims priority from Japanese patent applications JP 2005-079282, filed Mar. 18, 2005 and JP 2006-066882, filed Mar. 13, 2006, the entire contents of which are hereby incorporated by reference.
- (1) Field of the Invention
- The present invention relates to a multiple phase claw pole type motor used in the fields of industry, home electric appliances, motor vehicles, and the like, and, more particularly, to a multiple phase claw pole type motor having an improved stator iron core.
- (2) Description of Related Art
- Claw pole type iron cores are attracting attention which are provided in ordinary rotating electric motors for the purpose of improving the rate of use of magnetic fluxes by increasing a winding factor of windings, as disclosed in JP-A-2003-333777 for example.
- In the conventional rotating electric motor having a claw pole type iron core, claw poles of the iron core are formed by laminating a rolled plate and, therefore, can only be obtained in a simple shape. Therefore, the conventional rotating electric motor cannot be obtained as a desirable high-efficiency motor.
- An object of the present invention is to provide a multiple phase claw pole type motor with high efficiency having claw poles easily manufacturable.
- To achieve the above object, in a multiple phase claw pole type motor having a plurality of claw poles including a claw portion extending in an axial direction and having a magnetic pole surface facing a rotor in a state of being separated from the rotor by a small gap, a radial yoke portion extending radially outwardly and perpendicularly from this claw portion, and an outer peripheral yoke extending from this radial yoke portion in the same direction as the direction of extension of the claw portion, a stator core formed by alternately placing the claw poles in a circumferential direction so that a distal end of each claw portion faces the radial yoke of an adjacent one of the claw poles and having a stator constructed by sandwiching an annular coil with the adjacent claw poles of this stator iron core, the present invention makes the claw poles formed with a magnetic compact having a DC magnetizing property of its flux density becoming 1.7 teslas when 10000 A/m of magnetic field is applied.
- The claw pole is formed by compacting a magnetic powder as described above. The claw pole can therefore be formed so as to have a complicated shape. Also, a high-efficiency motor can be obtained by using a magnetic compact having a DC B-H curve of its flux density becoming 1.7 teslas when 10000 A/m of magnetic field is applied.
- According to the present invention, as described above, a multiple phase claw pole type high-efficiency motor having claw poles easily manufacturable can be obtained.
- Other objects, features, and advantages of the present invention will become clear from the following description of embodiments of the present invention relating to accompanying drawings.
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FIG. 1 is an exploded perspective view of a first claw pole and a second claw pole used in a first embodiment of a three-phase claw pole type motor according to the present invention; -
FIG. 2 is a perspective view partly in section of a part of stator iron cores for three phases obtained by assembling the first and second claw poles shown inFIG. 1 ; -
FIG. 3 is a schematic longitudinal sectional view of the entire three-phase claw pole type motor according to the present invention; -
FIG. 4A is a sectional view taken along line A-A inFIG. 3 ; -
FIG. 4B is a sectional view taken along line B-B inFIG. 3 ; -
FIG. 4C is a sectional view taken along line C-C inFIG. 3 ; -
FIG. 4D shows the construction of an inductor type rotor; -
FIG. 4E shows the construction of a rotor having an inductor and magnets; -
FIG. 4F shows the construction of a salient pole type rotor; -
FIG. 5A is a diagram showing B-H curves of various iron core materials; -
FIG. 5B is a diagram showing B-H curves of various iron core materials; -
FIG. 6A is a diagram showing a mesh model of the iron core and the results of computation on the various iron core materials using three-dimensional magnetic field analysis; -
FIG. 6B is a diagram showing the results of calculation of output torque of the motor constructed of various iron core materials; -
FIG. 6C is a diagram showing the relationship between the flux density and the output torque of the motor, constructed of various iron core materials, at 10000 A/m; -
FIG. 6D is a diagram showing the relationship between the claw pole thickness and the output torque of the motor constructed of an SMC (Soft Magnetic Composite); -
FIG. 6E is a diagram showing the relationship between the flux density and the output torque of the motor, constructed of various iron core materials, at 10000 A/m; -
FIG. 7A is a sectional view showing a main flux and a leakage flux in the claw pole; -
FIG. 7B is developed plan view showing a leakage flux in the claw pole; -
FIG. 8 is a diagram showing the results of computation of the relationship between the shape of the claw portion of the claw pole and the effective value of the linkage flux using three-dimensional magnetic field analysis; -
FIG. 9 is a perspective view partly in section of a second embodiment of the three-phase claw pole type motor according to the present invention; -
FIG. 10 is a sectional view partly in section of a third embodiment of the three-phase claw pole type motor according to the present invention; -
FIG. 11 is a perspective view partly in section of a fourth embodiment of the three-phase claw pole type motor according to the present invention; -
FIG. 12 is a sectional view partly in section showing the relationship between the magnetic poles and the claw poles shown inFIG. 11 ; -
FIG. 13 is an exploded plan view showing an example of modification of the fourth embodiment; -
FIG. 14 is an enlarged view partly in section of a fifth embodiment of the three-phase claw pole type motor according to the present invention; -
FIG. 15 is a partly exploded perspective view of a sixth embodiment of the three-phase claw pole type motor according to the present invention; -
FIG. 16 is a partly exploded perspective view showing an example of modification of the sixth embodiment; -
FIG. 17 is a perspective view of a claw iron core of a seventh embodiment of the three-phase claw pole type motor according to the present invention; -
FIG. 18 is a perspective view of a claw iron core of an eighth embodiment of the multiple phase claw pole type motor according to the present invention; -
FIG. 19 is a perspective view showing an example of modification of claw poles; -
FIG. 20 is a perspective view showing another example of modification of claw poles; -
FIG. 21 is a perspective view showing still another example of modification of claw poles; -
FIG. 22A is a diagram showing the results of measurement of the induced electromotive force of the claw pole type motor using iron plates such as SPCC; -
FIG. 22B is a diagram showing an induced voltage waveform at the rotating speed of 250 r/min; and -
FIG. 22C is a diagram showing an induced voltage waveform at the rotating speed of 1000 r/min. - Hereafter, a first embodiment of a multiple phase claw pole type motor according to the present invention will be described on the basis of FIGS. 1 to 4.
- A three-phase claw pole type motor is constructed by a
rotor 2 constructed on arotating shaft 1, astator 5 formed concentrically with thisrotor 2 in a state of being separated from the same by a small gap formed in a circumferential direction, and a stator frame 7 on which thestator 5 is supported. Therotating shaft 1 is rotatably supported on opposite ends of the stator frame 7 bybearings - The
rotor 2 is constructed by arotor iron core 3 formed concentrically with therotating shaft 1, and a plurality ofmagnetic poles 4 formed of permanent magnets fixed on the outer periphery of therotor iron core 3. Thestator 5 is constructed bystator iron cores annular coils 13 wound on thestator iron cores stator iron cores rotating shaft 1 is rotatably supported by thebearings - Each of the
stator iron cores first claw pole 9A and asecond claw pole 9B. Each of thefirst claw pole 9A and thesecond claw pole 9B is constructed by aclaw portion 10 having amagnetic pole surface 10F extending in an axial direction and facing therotor 2 while being separated from the same by the small gap, aradial yoke portion 11 extending radially outwardly and perpendicularly from theclaw portion 10, and an outerperipheral yoke 12 extending from theradial yoke portion 11 in the same direction as the direction of extension of theclaw portion 10. Each of theradial yoke portion 11 and the outerperipheral yoke 12 has a circumferential length L2 twice or longer than the circumferential length L1 of theclaw portion 10. Theclaw portion 10 is connected to one side along the circumferential direction of theradial yoke portion 11 having the circumferential length L2. The outerperipheral yoke 12 has an axial length L4 of about ½ of an axial length L3 of theradial yoke portion 11. - The
first claw pole 9A and thesecond claw pole 9B are formed into shapes identical to each other by compacting a magnetic powder in a die. In this way, a complicated magnetic pole structure can be obtained in comparison with those constructed by laminating silicon steel plates. - The
first claw poles 9A and thesecond claw poles 9B formed as described above are alternately arranged in the circumferential direction so that the end of theclaw portion 10 faces the inside diameter side of theradial yoke portion 11 of theadjacent claw pole stator iron core 6U incorporating theannular coil 13U. Thestator iron cores annular coils stator iron core 6U in the axial direction with shifts of 120° in terms of an electrical angle, as shown inFIGS. 4A to 4C, thus constructing the three-phase claw pole type motor having the same number ofmagnetic poles 4 as the number ofclaw portions 10, i.e., sixteenmagnetic poles 4. These three groups ofstator iron cores stator 5 in which thefirst claw poles 9A, thesecond claw poles 9B, and theannular coils - The construction of the
rotor 2 is not limited to the construction of arranging themagnets 4 on its surface, but it is possible to obtain running torque so long as therotor 2 is a rotor, which constructs a pole, such as a rotor which has saliency as shown inFIG. 4F , a cage type inductor shown inFIG. 4D , and a rotor which has magnets and an inductor as shown inFIG. 4E . - As described above, a complicated magnetic pole construction, in other words, a magnetic pole construction capable of improving the motor efficiency can be obtained by forming the
first claw poles 9A and thesecond claw poles 9B by compacting a magnetic powder. -
FIGS. 5A and 5B show the results of measuring the B-H curves of each raw material. This measurement was performed by a ring sample type measuring method (JIS H 7153), and shows DC B-H curves. Iron core bodies formed by compacting a magnetic powder (soft magnetic composites i.e.SMCs FIG. 5B , the flux density of theSMC 1 obtained when a magnetic field of 10000 A/m is applied to its compact is 1.7 teslas or more, and when 80000 A/m, which is large magnetic field strength is applied, the flux density exceeds 2 teslas. On the other hand, the flux density of theSMC 2 obtained when the magnetic field of 10000 A/m is applied to its compact is 1.6 teslas, and when 80000 A/m, which is large magnetic field strength is applied, the flux density is 1.8 teslas or so. As for anSMC 3, its flux density obtained when the magnetic field of 10000 A/m is applied to its compact is only 1.26 teslas, and when 80000 A/m, which is large magnetic field strength is applied, the flux density is less than 1.5 teslas. It can be expected that the obtained torque of theSMC 3 where the flux density as an SMC is low is also small when it is used in a motor. -
FIGS. 6B to 6E show the results of calculation of the output torque of motors in three-dimensional magnetic field analysis using a finite element method. First, a mesh model is shown inFIG. 6A . In this example, one cycle of electrical angle (equivalent to a machine angle of 45°) of a three-phase claw pole motor with outside diameter size of φ60 mm and 8 poles is modeled.FIG. 6B shows the result of calculation of the output torque, obtained when a current is given to a coil of each phase using this model, using the B-H curves of each material. In the consequence of calculation on the condition that shapes of the motors were completely the same, it was found that, as for the output torque of the motors, the higher a magnetic permeability of a material was, the higher the output torque was. That is, according to the results of calculation with four kinds of materials shown inFIG. 5B , the torque of SPCC is the largest, and the torque of theSMC 3 is the smallest.FIG. 6C shows this relationship with taking the flux density at the time of 10000 A/m as a horizontal axis and taking the output torque as a vertical axis. It was found that the output torque became large in proportion to the flux density. - Next, since the SMC can obtain its core shape by compacting, it is possible to employ a pole shape which improves efficiency, as described previously. A specific method is to change pole thickness, which was a limit for SPCC, or the like.
FIG. 6D shows the results of calculation with having increased the thickness of the SMC and having performed the same calculation as the above. It becomes clear that, when the thickness of claws of the SMC increases under the same conditions of the field magnets and the motor size, the output torque had an optimal value.FIG. 6E shows the result of plotting with superposing this optimal value onFIG. 6C having been explained previously. It was confirmed that theSMC 1 exceeded the limit torque in the case of construction from SPCC. - Hence, in this embodiment, it is easy to manufacture the
claw poles claw poles - In addition, since the multiple phase claw pole motor constructed of the SMC core is hardly influenced by an eddy current loss, it is also advantageous to be able to be driven at an RF (radio-frequency). Although the comparison of the output torque in
FIG. 5 mentioned above was at low speed (a frequency area with slight influence of an eddy current), properties of the motor constructed of the SMC core will further improve in an RF.FIG. 22A shows the relationship between the revolution speed and the effective value of no-load induced electromotive force. In a claw pole motor constructed from iron plates such as SPCC, when the revolution speed becomes large, an eddy current flows inside the iron plates in a direction of obstructing magnetic fluxes. Then, owing to a denial operation of the magnetic fluxes by the current, a waveform of the induced electromotive force is distorted as shown inFIG. 22B , and an effective value becomes small. On the other hand, in the claw pole motor whose core is constructed of the SMC, since an eddy current hardly flows, it becomes an effective value of the induced electromotive force linear to a frequency (revolution speed). Hence, although the conventional claw pole type motor with the conventional claw poles could not be used for an application at high revolution speed, the claw pole motor constructed of the SMC core can be driven at high revolution speed (high frequency area). - In addition, because the eddy current hardly flows it is also possible to correspond to a PWM method of control system which performs a pulse division of a sinusoidal voltage and driving. PWM is a drive system of obtaining an effective value of a voltage in a pulse-like voltage. Since a switching frequency of those pulses is usually about 10 times of a maximum frequency of a drive current of a motor, that is, a very high frequency, an eddy current arises by its RF component. Hence, since iron loss becomes large in a conventional claw pole motor constructed from iron plates, the motor has become an inefficient motor. Since the eddy current hardly flows, the claw pole type motor of the present invention which is constructed of the SMC core can be driven.
- On the other hand, large torque pulsation occurs in the case of use of the iron core formed by compacting a magnetic powder, such that the magnitude of pulsation is ⅓ of the average torque. The cause of this torque pulsation is a large distortion in the waveforms of voltages induced in the
annular coils 13U to 13W by local magnetic saturation in theclaw poles - These leakage magnetic fluxes will be described with reference to
FIGS. 7A and 7B .FIG. 7A shows a flow of a main flux Φ. The main flux Φ emerging from one N magnetic pole in themagnetic poles 4, for example, enters theclaw portion 10 of thefirst claw pole 9A through a gap, enters theclaw portion 10 of thesecond claw pole 9B from theclaw portion 10 of thefirst claw pole 9A in linkage to theannular coil 13, and enters the Smagnetic pole 4 from theclaw portion 10 of thesecond claw pole 9B through the gap, thus forming a magnetic path returning to the Nmagnetic pole 4. Apart from the main flux Φ, an interpole leakage flux Φ1 exists. If the interpole size SO between theclaw portions 10 of the first andsecond claw poles magnetic poles 4 and theclaw portions 10, the interpole leakage flux Φ1 forms a magnetic path by shortcutting between theclaw portions 10 without linkage to theannular coil 13, resulting in reduction in a rate of use of the magnetomotive force of themagnetic poles 4 formed of permanent magnets. The interpole size SO between theclaw portions 10 may be increased by considering this phenomenon. However, if the interpole size SO is increased, the width of themagnetic pole surface 10F is so small that the effective value of the linkage flux of linkage between the main flux Φ and theannular coil 13 is considerably reduced. It is not advisable to adopt such an easy way of increasing the interpole size SO. - Further, the generation of an in-pole leakage flux Φ2 is a phenomenon in which, as shown in
FIG. 7B , part of the main flux Φ entering theclaw portion 10 of thefirst claw pole 9A enters theradial yoke portion 11 of the adjacentsecond claw pole 9B facing thefirst claw pole 9A from the distal end of thefirst claw pole 9A by forming the in-pole leakage flux Φ2, and flows in theradial yoke portion 11 in the circumferential direction to form a magnetic path reaching theclaw portion 10 of thesecond claw pole 9B. To reduce this in-pole leakage flux Φ2, a sectional area of the distal end of theclaw portion 10 may be reduced by increasing the angle θk of themagnetic pole surface 10F or the gap d1 between the distal end of theclaw portion 10 and theradial yoke portion 11 may be increased. These measures to reduce the in-pole leakage flux Φ2 entails the drawback of reducing the area of themagnetic pole surface 10F and thereby reducing the effective value of the linkage flux as in the above-described case. It is not advisable to adopt these measures. -
FIG. 8 shows the results of computation of the relationship between the interpole size SO and the effective value of the linkage flux using the above-mentioned three-dimensional magnetic field analysis. - As is apparent from
FIG. 8 , the effective value of the linkage flux can be increased by increasing the angle θk of themagnetic pole surface 10F and by reducing the interpole size SO of theadjacent claw portions 10. However, if the effective value of the linkage flux is increased, the leakage fluxes (Φ1, Φ2) are also increased to cause an increase in distortion of the waveform of the induced voltage, as described above. - A second embodiment of the three-phase claw pole type motor in accordance with the present invention arranged to solve the above-described problem due to the leakage fluxes (Φ1, Φ2) and capable of maintaining a high effective value of the linkage flux will be described with reference to
FIG. 9 . InFIG. 9 , the same reference characters as those in the figure showing the first embodiment indicate the same component parts. The description of the same component parts will not be repeated. - In this embodiment, the angle θk of the
magnetic pole surface 10F is increased and the thickness T of theclaw portion 10 is increased. Also, the thickness T is gradually increased along a direction from the distal end of theclaw portion 10 toward theradial yoke portion 11. - If the sectional area of the
claw portion 10 is increased as described above, a high effective value of the linkage flux can be maintained. Also, local magnetic saturation regions in the first andsecond claw poles magnetic pole surface 10F. Therefore, distortion in the waveform of the induced voltage can be reduced and torque pulsation can be limited. -
FIG. 10 shows a third embodiment of the three-phase claw pole type motor in accordance with the present invention. The third embodiment differs from the first embodiment in the sectional shape of themagnetic pole 4 in the rotor side. - That is, in this embodiment, the
magnetic pole 4 is formed so as to have a sectional shape with a convex curve such that a central portion in the circumferential direction is closest to theclaw portion 10 while opposite end portions in the circumferential direction are remotest from theclaw portion 10. - If a curved surface defined by such a convex curve is formed on the
magnetic pole 4, the main flux Φ can be made to flow concentrically from a center of the curved surface into theclaw portion 10. Also, the resistance of the magnetic flux path for the interpole leakage flux Φ1 flowing in theclaw portions 10 through the opposite end portions of themagnetic pole 4 in the circumferential direction as shown inFIG. 7A is increased by increasing the gap between themagnetic pole 4 and theclaw portion 10, thereby reducing the amount of leakage of this flux. As a result, the interpole leakage flux Φ1 can be reduced without reducing the effective value of the linkage flux. - A fourth embodiment of the three-phase claw pole type motor in accordance with the present invention in which the shape of the
claw portion 10 is changed to reduce a leakage flux will be described with reference toFIGS. 11 and 12 . - The area of the
magnetic pole surface 10F of theclaw portion 10 facing themagnetic pole 4 is increased to ensure a high effective value of the linkage flux. The area of themagnetic pole surface 10F is increased by reducing the angle θk in the construction shown inFIG. 1 so that the sides defining the angle θk are parallel to the axial direction. Also, the interpole size SO between theclaw portions 10 of each adjacent pair of the first andsecond claw poles claw portions 10 and themagnetic poles 4, but the interpole size So between portions of theclaw portions 10 having a thickness t in themagnetic pole 4 side is reduced. - If the
claw portions 10 are formed in this manner, the flow of the interpole leakage flux Φ1 into the portions having the thickness t, between which the magnetic path between theclaw portions 10 is restricted, is limited, thereby reducing the interpole leakage flux Φ1. - To reduce the in-pole leakage flux Φ2, the gap d2 between the distal end of the
claw portion 10 and theradial yoke portion 11 of theadjacent claw pole 9A (or 9B) may be increased. - A leakage flux Φ3 between adjacent pair of phases can be reduced, for example, by setting the gap d3 between the distal end of the
claw portion 10 in the U-phase side and theradial yoke portion 11 of theadjacent claw pole 9A in the V-phase side to an increased value, as shown inFIG. 13 . -
FIG. 14 shows a fifth embodiment of the three-phase claw pole type motor in accordance with the present invention. - In this embodiment, to enable the main flux Φ to flow through the shortest distance, concave portions R1 and R2 formed of polygonal surfaces are respectively formed as an inner corner portion in the connecting portion between the
claw pole radial yoke portion 11 and an inner corner portion in the connecting portion between theradial yoke portion 11 and the outerperipheral yoke 12. The concave portions R1 and R2 are formed by connecting a certain number of surfaces at certain angles. They may alternatively be formed of one curved surface or a certain number of curved surfaces. - A sixth embodiment of the three-phase claw pole type motor in accordance with the present invention will be described with reference to
FIG. 15 . The same basic construction for increasing the effective value of the linkage flux between thefirst claw pole 9A and thesecond claw pole 9B and reducing leakage fluxes as that in each of the above-described embodiments is also used in this embodiment. The description of the basic construction will not be repeated. - A three-dimensional shape can be integrally formed since the
first claw pole 9A and thesecond claw pole 9B constructing each ofstator cores first claw pole 9A and thesecond claw pole 9B are formed so as to be identical in shape to each other, it is desirable to attach marks used as a reference at the time of assembly to the first andsecond claw poles - To provide such a function in this embodiment, recesses 14 and
projections 15 capable of engaging with therecesses 14 are formed in the outerperipheral yoke 12 constructing thefirst claw pole 9A and thesecond claw pole 9B. Therecesses 14 and theprojections 15 are formed in the first andsecond claw poles second claw poles groove 14 and aprojection 15 are formed at positions distanced by 180° in terms of electrical angle in the circumferential direction. Since the first andsecond claw poles - When the first and
second claw poles projections 15 into therecesses 14 in the axial direction, with theannular coil 13 interposed between theclaw portions 10 and theradial yoke portions 11. Thus, the assembly can be easily completed. -
FIG. 16 shows an example of modification of the sixth embodiment. Alead wire channel 16 through which alead wire 13R corresponding to a winding-leading end and/or a wiring-trailing end of theannular coils 13 is laid to the outside is formed by integral compacting in each of the surfaces of theradial yoke portions 11 of the first andsecond claw poles annular coil 13. - If the
lead wire channel 16 is formed in theradial yoke portion 11 in advance, the need for provision of an additional space for thelead wire 13R is eliminated, thereby increasing the winding density of theannular coil 13 and enablinglead wires 13R in the entire motor to be laid in a determined direction. - While the facility with which the first and
second claw poles second claw poles FIG. 17 . - That is, a
recess 16 and aprojection 17 are formed in theradial yoke portion 11 side in the outerperipheral yokes 12 of the first andsecond claw poles recess 14 and theprojection 15 shown inFIG. 15 .Recesses 16 each capable of being fitted to oneprojection 17 provided at least in one place are formed at positions distanced by ±60° and ±120° in terms of electrical angle from the position of theprojection 17, thereby enabling the outerperipheral yokes 12 of the first andsecond claw poles -
FIG. 18 shows an eighth embodiment of the multiple phase claw pole type motor in accordance with the present invention. Fittingholes 18 and afitting projection 19 arranged in the axial direction are formed in the outerperipheral yokes 12 of the first andsecond claw poles - In each of the above-described embodiments, the first and
second claw poles claw pole assembly 20 in which claw pole portions for one phase (360°) are formed integrally with each other as shown inFIG. 19 , aclaw pole assembly 21 in which claw pole portions for ½ phase (180°) are formed integrally with each other as shown inFIG. 20 and aclaw pole assembly 22 in which claw pole portions for ¼ phase (90°) are formed integrally with each other as shown inFIG. 21 may be formed. In such case, the relationship between the positions at which therecesses projections fitting projections 19 are provided may be angular relationships of integer multiples of ±60° and ±120° in terms of electrical angle. - Although the above-mentioned description was made about embodiments, the present invention is not limited to them, but it is apparent to those skilled in the art that various changes and modifications can be made within the scope of the spirit of the present invention, and the attached claims.
Claims (6)
1. A claw pole type motor comprising:
a first claw pole comprised of a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pole portions arranged on the inner diameter side, and axially extended, and an outer peripheral side yoke portion extending on the outer diameter side,
a second claw pole comprised of a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pawl portions arranged on the inner diameter side, and axially extending,
and an outer peripheral side yoke portion arranged on the outer diameter portion,
the first claw pole and the second claw pole being opposed to each other,
a stator core having an inner diameter side, and formed so as to cause the pole portions of the first claw pole to be meshed with the pole portions of the second claw pole, and
a rotor arranged on the inner diameter side of the stator core with a circumferential gap being defined therebetween,
characterized in that:
the plurality of pole portions and the outer peripheral side yoke portions, which are comprised of the first and second claw poles, extend in an axial direction of the motor,
and further the first and second claw poles are formed by compression molding of magnetic powder.
2. A claw pole type motor as set forth in claim 1 , characterized in that the first and second claw poles are formed in one and the same shape.
3. A claw pole type motor as set forth in claim 1 , characterized in that the pole portions of both first and second claw poles have an axial length which is equal to twice the axial length of the outer peripheral side yoke of the first claw pole.
4. A claw pole type motor as set forth in claim 1 , characterized in that the outer peripheral side yoke of the first claw pole and that of the second claw pole are opposed to each other so as to define one outer peripheral surface.
5. A claw pole type motor as set forth in claim 1 , characterized in that each of the pole portions of the first and second claw poles has a radial thickness which is gradually decreased from its front end to the associated radial yoke portion.
6. A claw pole type motor as set forth in claim 1 , characterized in that the first and second claw pole are formed, one phase part thereof being integrated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/936,266 US20080067889A1 (en) | 2005-03-18 | 2007-11-07 | Multiple phase claw pole type motor |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005079282 | 2005-03-18 | ||
JP2005-079282 | 2005-03-18 | ||
JP2006-066882 | 2006-03-13 | ||
JP2006066882A JP4878183B2 (en) | 2005-03-18 | 2006-03-13 | Multiphase claw pole type motor |
US11/376,091 US7714475B2 (en) | 2005-03-18 | 2006-03-16 | Multiple phase claw pole type motor |
US11/781,065 US7795774B2 (en) | 2005-03-18 | 2007-07-20 | Multiple phase claw pole type motor |
US11/936,266 US20080067889A1 (en) | 2005-03-18 | 2007-11-07 | Multiple phase claw pole type motor |
Related Parent Applications (1)
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US11/781,065 Continuation US7795774B2 (en) | 2005-03-18 | 2007-07-20 | Multiple phase claw pole type motor |
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US11/376,091 Active US7714475B2 (en) | 2005-03-18 | 2006-03-16 | Multiple phase claw pole type motor |
US11/781,065 Active US7795774B2 (en) | 2005-03-18 | 2007-07-20 | Multiple phase claw pole type motor |
US11/936,266 Abandoned US20080067889A1 (en) | 2005-03-18 | 2007-11-07 | Multiple phase claw pole type motor |
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US11/376,091 Active US7714475B2 (en) | 2005-03-18 | 2006-03-16 | Multiple phase claw pole type motor |
US11/781,065 Active US7795774B2 (en) | 2005-03-18 | 2007-07-20 | Multiple phase claw pole type motor |
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US20110234145A1 (en) * | 2010-03-25 | 2011-09-29 | Langreck Gerald K | High acceleration rotary actuator |
US8482243B2 (en) * | 2010-03-25 | 2013-07-09 | Gerald K. Langreck | High acceleration rotary actuator |
US8674649B2 (en) * | 2010-03-25 | 2014-03-18 | Gerald K. Langreck | High acceleration rotary actuator |
US20140319949A1 (en) * | 2010-03-25 | 2014-10-30 | Gerald K. Langreck | High acceleration rotary actuator |
US20160268877A1 (en) * | 2010-03-25 | 2016-09-15 | Gerald K. Langreck | High acceleration rotary actuator |
US20190028002A1 (en) * | 2010-03-25 | 2019-01-24 | Gerald K. Langreck | High acceleration rotary actuator |
US20210367484A1 (en) * | 2010-03-25 | 2021-11-25 | Gerald K. Langreck | High acceleration rotary actuator |
Also Published As
Publication number | Publication date |
---|---|
JP2006296188A (en) | 2006-10-26 |
US7795774B2 (en) | 2010-09-14 |
US20070262671A1 (en) | 2007-11-15 |
US7714475B2 (en) | 2010-05-11 |
US20060208602A1 (en) | 2006-09-21 |
JP4878183B2 (en) | 2012-02-15 |
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