WO2006019123A1 - ステッピングモータおよびその極歯製造方法 - Google Patents
ステッピングモータおよびその極歯製造方法 Download PDFInfo
- Publication number
- WO2006019123A1 WO2006019123A1 PCT/JP2005/015027 JP2005015027W WO2006019123A1 WO 2006019123 A1 WO2006019123 A1 WO 2006019123A1 JP 2005015027 W JP2005015027 W JP 2005015027W WO 2006019123 A1 WO2006019123 A1 WO 2006019123A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pole teeth
- rotor
- phase
- stepping motor
- yoke plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
- H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
- H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/021—Magnetic cores
- H02K15/022—Magnetic cores with salient poles
Definitions
- the present invention relates to a flat stepping motor in which a stator is projected on both sides of a rotor and a method for manufacturing the pole teeth. More specifically, the stator pole teeth have been improved so that the upper yoke plate and the lower yoke plate are sandwiched between both ends of the coil, and the comb-like pole teeth of both yoke plates are held together in the upper and lower sides. About.
- This claw pole type stepping motor has comb-shaped pole teeth on the stator side, and has a configuration in which the pole teeth face each other with the pole teeth in mesh.
- This claw pole type stepping motor has the advantage that the resolution is relatively good and the manufacturing cost can be reduced.
- a stepping motor having a configuration in which a stator is projected in a flat shape is disclosed in JP-A-10-112970 (Patent Document 1).
- stators are arranged on both sides of the rotor to reduce the thickness and size.
- coils are arranged in the direction along the rotor axis. The coil has a structure in which an iron core is arranged at the center, and the upper yoke plate and the lower plate are sandwiched between both ends of the iron core so that the comb-shaped pole teeth of the yoke plate are held together vertically. Is adopted.
- the positional relationship between the pole teeth is required to be set strictly because the positional relationship between the pole teeth greatly affects the angular accuracy and the torque characteristics.
- the angle accuracy is deteriorated due to the influence of detent torque and magnetic flux interference.
- Patent Document 2 JP-A-9-28072
- Patent Document 3 Proposals such as those found in Japanese Patent No. 3366487
- Patent Document 3 the pole teeth of each adjacent phase are made different from the theoretical phase angle, thereby reducing the vibration of the rotor and facilitating the rotation.
- the shape of the pole teeth is formed in a substantially arc shape in the direction of narrowing the width, and the interference of the magnetic flux is reduced to improve and improve the angular accuracy and torque characteristics. ing.
- Patent Document 1 Japanese Patent Laid-Open No. 10-112970
- Patent Document 2 Japanese Patent Laid-Open No. 9-28072
- Patent Document 3 Japanese Patent No. 3366487
- Patent Documents 2 and 3 have a configuration in which the stators of the respective phases are arranged coaxially with respect to the rotor, and are different from the configuration according to the present invention and are applied as they are. It is not possible. In other words, flat stepping motors that project the stator on both sides of the rotor almost symmetrically do not have pole teeth arranged at equal intervals on the circumference that surrounds the rotor. It cannot be applied.
- the pole teeth of the other-phase stators are arranged adjacent to each other, so that magnetic flux interference is large. Furthermore, the arrangement of the pole teeth is not arranged at equal intervals on the circumference surrounding the rotor, and the magnetic path length varies depending on each pole tooth, resulting in magnetic flux bias. And these appear remarkably in the structure which aims at size reduction.
- the pole teeth are manufactured by first drawing the yoke plate into the corresponding part and forming it into a dome shape, then punching the dome shape part with a punching die, and then ironing and bending. This is formed into pole teeth by raising the corresponding part left after punching. As a result, the raised pole teeth will swell thicker than the cutting edge of the punching die. For this reason, When assembled, the distance between the pole teeth is different from the design value, affecting the distribution of magnetic flux and degrading the angular accuracy.
- the stepping motor also has a problem related to the drive system.
- each phase cancels out the mutual magnetic flux interference, and the angle error is relatively difficult to appear.
- the angle error increases between the A phase and the B phase. There is. Therefore, it is sufficient to improve the angle accuracy and torque characteristics for 1-phase excitation.
- 1-phase excitation, 2-phase excitation, and micro-step drive can achieve high angular accuracy and smooth rotation. There are desirable side effects.
- the present invention solves the above-mentioned problems, and an object of the present invention is to optimize the positional relationship and shape of the pole teeth, thereby improving the angular accuracy and improving the torque characteristics, and the step motor
- the object is to provide a method for manufacturing a pole tooth.
- a stepping motor has a rotor with permanent magnets magnetized in multiple poles, and A-phase and B-phase stators are projected on both sides of the rotor.
- the stator has a coil in a direction along the rotor axis, an iron core is arranged in the center of the coil, and an upper yoke plate having comb-shaped pole teeth facing the rotor and a lower yoke plate
- the yoke plates are arranged at both ends of the iron core so that the pole teeth are held up and down.
- Each pole tooth of the stator is mechanical angle at the corresponding position between A phase and B phase
- ⁇ is an integer
- ⁇ is the number of steps
- ⁇ is the shift angle
- ⁇ is the mechanical angle
- stator is symmetrically projected on both sides of the rotor, and the shift angle ⁇ is set between the A phase and the B phase where the adjacent interval between the pole teeth with the other phase stator is wide. It is better to shift the position by ⁇ Z2.
- the pole teeth are formed such that the upright height rising from the yoke plate is longer than the radius to the shaft center of the facing rotor, and the shape is substantially triangular with a wide base and a narrow tip.
- the sides on both sides of the tip can be set to have a valley point in a bent shape that reduces the width.
- the valley bottom point in the pole teeth is the upright height H, the height h to the valley bottom point, the width w at the valley bottom point height h, and the valley bottom point height h.
- the reference width W when both sides are linear is the reference width W when both sides are linear.
- the rotor includes a permanent magnet magnetized in multiple poles and a plurality of stators, the stator has a coil in a direction along the rotor axis, and comb-shaped pole teeth facing the rotor.
- the stator has a coil in a direction along the rotor axis, and comb-shaped pole teeth facing the rotor.
- a stepping motor pole tooth manufacturing method that is formed longer than the radius to the shaft core of the stepping motor, and by drawing the corresponding portion of the plate member to be processed into the yoke plate, forming it into a dome shape,
- the dome-shaped part is punched by a punching die provided with an annular punching blade corresponding to the pole teeth, and the punching die is a blade that allows for the amount of elongation in the subsequent ironing and bending process Set in shape And, for each site leaving then punched, taking a method of forming the pole teeth by causing up the relevant part performing ironing and bending.
- the position of the pole tooth is shifted by the mechanical angle and the theoretical position force by the shift angle ⁇ , and therefore the interference of the magnetic flux of the other phase stator can be reduced. You can. As a result, angle accuracy can be improved.
- the pole teeth are shifted in a direction in which interference of magnetic flux with the other-phase stator is reduced. Therefore, the deviation of the magnetic flux distribution between the different phases can be reduced, and the angle accuracy can be improved with a small shift amount for each pole tooth.
- the phases are shifted symmetrically in each phase, so that the arrangement of the upper yoke plate and the lower yoke plate can be used upside down, and the number of parts can be reduced.
- the pole teeth have a substantially triangular shape with a wide base and a narrow tip, high torque with less magnetic flux interference can be expected even when the size is reduced.
- the poles of a substantially triangular shape are set to have a valley bottom point in the bent shape that reduces the width on both sides sandwiching the tip, the bottom point should be matched to the maximum position of magnetic flux interference between the pole teeth. Can be set to avoid the interference of magnetic flux as much as possible. Since the base width of the pole teeth where the magnetic flux is most concentrated is not changed, the angular accuracy can be improved while maintaining a high torque. In this case, the management of the shape of the pole teeth can be facilitated, and the area of the pole teeth can be increased compared with the invention of Patent Document 3 described above.
- the valley bottom point is set so that the interference of magnetic fluxes is minimum for the confronting pole teeth, and the deviation of the magnetic flux distribution is maintained while maintaining a high torque. Interference can be reduced.
- claims 2 and 4 may be combined.
- shifting the corresponding position of the pole tooth by the shift angle ⁇ from the theoretical value by the mechanical angle can improve the angle accuracy in the drive of one-phase excitation.
- increasing the amount of displacement affects the angular accuracy and torque characteristics in the two-phase excitation drive, and there is a limit to improving the angular accuracy by optimizing the pole tooth shape. Therefore, by combining claims 2 and 4, the shift amount of the corresponding position of the pole teeth can be reduced, and the angular accuracy can be dramatically improved.
- angle accuracy and torque characteristics can be improved in one-phase excitation, one-two-phase excitation, two-phase excitation, and microstep drive.
- the invention according to claim 5 is effective when the upright height of the pole teeth is formed longer than the radius to the axis of the rotor facing the pole teeth.
- Process ironing The blade shape is set to allow for the amount of elongation in bending and bending.
- the outer shape can be optimized.
- the pole teeth can have a straight shape on both sides sandwiching the tip, or can form valley points on both sides to have a bent shape that reduces the width.
- the positional relationship and shape of the pole teeth can be optimized.
- the angular accuracy can be dramatically improved, the output torque can be increased, and the torque characteristics can be improved.
- FIG. 1 shows one embodiment of the present invention.
- the stepping motor has a rotor 1 composed of multi-pole permanent magnets, and two (A-phase and B-phase) stators Sa and Sb are symmetrically arranged on both sides of the rotor 1. Adopting a configuration of projecting.
- Each of the stators Sa and Sb has a coil 2 in a direction along the axis of the rotor 1, the iron core 20 is arranged in the center of the coil 2, and comb-shaped pole teeth 5 facing the rotor 1 are provided.
- the upper yoke plate 3a (3b) and the lower yoke plate 4a (4b) are sandwiched between both ends of the iron core 20 so that the pole teeth 5 are clamped up and down, resulting in a loose claw pole type stepping motor.
- each of the yoke plates 3a, 4a, 3b, 4b is in the shape of a strip that is curved in a substantially arc shape, forming a fitting hole 6 for fitting the iron core 20, and a comb at the end facing the rotor 1.
- An array of tooth-shaped pole teeth 5 is formed, and sandwiched between both ends of the iron core 20 so that the pole teeth 5 are squeezed up and down, and the squeezing side faces the rotor 1. .
- the two upper yoke plates 3a and 3b and the two lower yoke plates 4a and 4b are manufactured in a state where both the A phase and the B phase are connected from a long strip plate material.
- an array of pole teeth 5 is punched and formed in the center of a long strip plate in a circular manner by the manufacturing method described later. It is excised at an appropriate time in the assembly process and separated into parts.
- the end of the iron core 20 is fitted and fixed in advance into the fitting hole 6 on one of the upper and lower yoke plates 3a, 4a, 3b, 4b, and the coil 2 is attached to each iron core 20. Assemble. Then, the other end of the iron core 20 is fitted and fixed in the fitting holes 6 of the yoke plates facing each other to assemble each stator (Sa, Sb), and each stator (Sa, Sb) is attached to the rotor 1. And place them facing each other.
- a comb-shaped pole tooth 5 is wound around the outer periphery of the rotor 1 to form a magnetic pole (inductor), and the two stators Sa and Sb have a flat shape that protrudes on both sides of the rotor shaft 10. It becomes a stepping motor.
- the shaft 10 of the rotor 1 is configured to be fitted and supported by a bearing (not shown), and the stators Sa and Sb are attached to a support portion that maintains a relative position with the bearing.
- FIG. 3 is a development view of the pole teeth 5
- FIG. 4 is a plan view.
- the corresponding position between phase A and phase B is mechanical angle
- ⁇ is an integer
- ⁇ is the number of steps
- ⁇ is the shift angle
- SHIFT is the mechanical angle
- each pole tooth 5 is the vaginal phase and the B phase is
- n are arranged at intervals. Where m is an integer (m and n are irrelevant).
- each pole tooth 5 of the stator has a corresponding mechanical angle between the A phase and the B phase theoretically,
- the position is shifted by the shift angle ⁇ , whereby the interference of magnetic flux can be reduced.
- the shift angle ⁇ is shifted by 0 Z2 between the A phase and the B phase on the side where the adjacent interval of the pole teeth 5 with the other phase stator is wide. That is, the shift angle Degree ⁇ is set to distribute to phase ⁇ and phase B by ⁇ ⁇ 2 respectively. Therefore, even if it is set to give a shift angle ⁇ with respect to the theoretical position, the upper yoke plate 3a and phase ⁇
- the lower yoke plate 4b has the same shape and configuration, and the A-phase lower yoke plate 4a and the B-phase upper yoke plate 3b have the same shape and configuration. Therefore, each yoke plate can be dealt with by turning it over, and there is an advantage that the number of parts to be manufactured can be reduced.
- the pole teeth 5 have a substantially triangular shape with a wide base and a narrow tip, and both sides sandwiching the tip are set to have a valley point 7 in a bent shape that reduces the width. And then.
- the valley bottom point 7 in the pole tooth 5 has an upright height H, a height h up to the valley bottom point 7, a width w at the height h of the valley bottom point 7, and a valley bottom point 7 Regarding the reference width W when both sides are straight at height h,
- pole teeth 5 are formed such that the upright height H rising from the yoke plate is longer than the radius to the axis of the rotor 1 facing the pole teeth 5.
- the pole teeth 5 are set to have the valley points 7 in the bent shape that reduces the width on both sides sandwiching the tip, the area is larger than that of Patent Document 3 described above. it can. In other words, it is possible to increase the area by forming the valley bottom point 7 and making it straight rather than forming it in a substantially arc shape in the direction of narrowing the width, and as a result, it is possible to reduce interference of magnetic flux while maintaining high torque.
- the pole teeth 5, that is, the yoke plate are manufactured in a state where both the A phase and the B phase are connected from a long strip material.
- the manufacturing method shown in the figure is a pole tooth manufacturing method in which the upright height H of the pole teeth 5 that are caused by the yoke plate force is formed longer than the radius r to the axis of the rotor that faces the rotor.
- the plate member 8 to be processed into a yoke plate is (a), the corresponding portion is drawn into a dome shape (b), and the dome-shaped portion has a punching blade corresponding to the pole tooth 5
- Punching is performed with a punching die with an annular shape (c).
- the punching die is set so that the blade shape forming the side of the pole tooth 5 has a valley point in a bent shape that reduces the width of the pole tooth 5.
- the punching die has a force capable of appropriately setting the blade shape forming the side of the pole teeth 5. To this end, it is necessary to reduce in advance the amount of swelling in the ironing / bending cage in the next step. . Therefore, by appropriately preparing a punching die, when the pole teeth 5 are raised, both sides sandwiching the tip may be straight and the shape may be an isosceles triangle.
- FIG. 7, FIG. 8, and FIG. 9 show various characteristics that simulate the configuration according to the present invention. That is, FIG. 7 is a graph showing the angle error, and shows the characteristics in the pole tooth setting according to the present invention.
- Fig. 8 is a graph showing the relationship between the external setting of the pole teeth and the motor characteristics, where (a) shows the angular characteristics of the motor rotation and (b) shows the relationships with the torque characteristics of the motor rotation.
- FIG. 9 is a graph showing the holding torque, where (a) shows the characteristics in the pole tooth setting according to the present invention, and (b) shows the characteristics in the conventional pole tooth setting.
- the angular error is determined by setting the outer shape of the pole teeth.
- This setting is effective for improving the angular accuracy, as shown in Fig. 9 (a). It can be said that it is an optimization condition because one ruding torque can be obtained well.
- FIG. 1 is a perspective view showing a preferred embodiment of a stepping motor according to the present invention.
- FIG. 2 is an exploded perspective view showing the stepping motor of FIG.
- FIG. 3 is a development view showing the positional relationship between pole teeth.
- FIG. 4 is a plan view for explaining the shifting angle of the pole teeth.
- FIG. 5 is a side view showing the outer shape of a polar tooth, (a) is the outer shape of the polar tooth according to the present invention, and (b) is the outer shape of the reference polar tooth.
- FIG. 6 (a) Force and (d) are cross-sectional views sequentially showing the manufacture of pole teeth.
- FIG. 7 is a graph showing the angle error, and shows the characteristics in the pole tooth setting according to the present invention.
- FIG. 8 is a graph showing the relationship between the pole tooth profile setting and the motor characteristics, where (a) shows the angular characteristics of the motor rotation and (b) shows the relationships with the torque characteristics of the motor rotation. .
- FIG. 9 is a graph showing the holding torque, where (a) shows the characteristics in the pole tooth setting according to the present invention, and (b) shows the characteristics in the conventional pole tooth setting.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004241667A JP4510548B2 (ja) | 2004-08-20 | 2004-08-20 | ステッピングモータ |
| JP2004-241667 | 2004-08-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006019123A1 true WO2006019123A1 (ja) | 2006-02-23 |
Family
ID=35907506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/015027 Ceased WO2006019123A1 (ja) | 2004-08-20 | 2005-08-17 | ステッピングモータおよびその極歯製造方法 |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4510548B2 (ja) |
| WO (1) | WO2006019123A1 (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5161195B2 (ja) * | 2009-11-25 | 2013-03-13 | 日本電産サンキョー株式会社 | モータ |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01136550A (ja) * | 1987-11-20 | 1989-05-29 | Canon Electron Inc | ステッピングモータ |
| JPH10112970A (ja) * | 1996-10-04 | 1998-04-28 | Denso Corp | ステップモータ |
| JP2004180446A (ja) * | 2002-11-28 | 2004-06-24 | Minebea Co Ltd | 扁平型ステッピングモータ |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05308768A (ja) * | 1992-04-28 | 1993-11-19 | Minebea Co Ltd | ステッピングモータ用ステータヨーク |
| JPH0731123A (ja) * | 1993-01-30 | 1995-01-31 | Mitsumi Electric Co Ltd | ステッピングモータのステータ成形方法 |
| JP3376057B2 (ja) * | 1993-11-30 | 2003-02-10 | キヤノン株式会社 | ステッピングモータ |
| JPH07191377A (ja) * | 1993-12-27 | 1995-07-28 | Canon Inc | 電磁駆動モーターユニット |
| JPH07199273A (ja) * | 1993-12-28 | 1995-08-04 | Canon Inc | 電動絞り装置 |
| JP4017286B2 (ja) * | 1999-06-03 | 2007-12-05 | 松下電器産業株式会社 | ステッピングモータのステータヨークの製造方法 |
-
2004
- 2004-08-20 JP JP2004241667A patent/JP4510548B2/ja not_active Expired - Fee Related
-
2005
- 2005-08-17 WO PCT/JP2005/015027 patent/WO2006019123A1/ja not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01136550A (ja) * | 1987-11-20 | 1989-05-29 | Canon Electron Inc | ステッピングモータ |
| JPH10112970A (ja) * | 1996-10-04 | 1998-04-28 | Denso Corp | ステップモータ |
| JP2004180446A (ja) * | 2002-11-28 | 2004-06-24 | Minebea Co Ltd | 扁平型ステッピングモータ |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4510548B2 (ja) | 2010-07-28 |
| JP2006060944A (ja) | 2006-03-02 |
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