CN1044955C - Step-by-step motor - Google Patents
Step-by-step motor Download PDFInfo
- Publication number
- CN1044955C CN1044955C CN93108135A CN93108135A CN1044955C CN 1044955 C CN1044955 C CN 1044955C CN 93108135 A CN93108135 A CN 93108135A CN 93108135 A CN93108135 A CN 93108135A CN 1044955 C CN1044955 C CN 1044955C
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- CN
- China
- Prior art keywords
- magnetic pole
- stator
- stator winding
- rotor
- housing
- 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.)
- Expired - Lifetime
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
To increase and stabilize the detent torque of a rotor at the time of non-conduction by setting the total of the areas of the magnetic poles of stator pairs on the interior side and the total of the areas of the magnetic poles of stator pairs on this side so as to be made to differ. A stepping motor 1 is set so that the total of the areas of the stators 21, 22 of stator pairs 3 on the interior side in a cap-shaped case 9 is made smaller than that of the areas of the magnetic poles 29, 30 of the stators 23, 24 of stator pairs 4 on the inlet side of a case 9. When magnetic flux closed while being passed through only one of magnetic poles 27, 28, 29, 30 is represented by PHIa and magnetic flux passed through two of them and a case 9 by PHIb, the detent torque of a rotor 2 takes a large value by the addition of two torque because magnetic flux PHIa is made larger than another magnetic flux PHIb in the wide magnetic poles 29, 30 of the stator pairs 4 and magnetic flux PHIb is made larger than another magnetic flux PHIa in the narrow magnetic poles 27, 28 of the stator pairs 3 in detent torque at the time of non- conduction. There is no dispersion on characteristics.
Description
The present invention relates to have improvement than the permanent-magnet type stepping motor of large braking torque.
The rotor brake torque that produces during permanent-magnet type stepping motor no power is that the magnetic attraction of rotor permanent magnet and stator poles between cog produces.Stator is made of 2 stator winding, and when these stator winding electrical angles only differed pi/2 phase, the brake torque cycle was π, thereby brake torque cancels each other between two stator winding, and is set to smaller value.
Usually, pursue the motor of high accuracy stop position, the load when becoming rotation (energising) owing to the stator torque, thereby be designed to brake torque for very little.But by purposes, brake torque makes the actual occasion that stops of load when no power, and bigger brake torque is essential.
The spy opens in the clear 60-43059 communique, and the width that has disclosed by making the stator poles tooth does not line up, and each middle mutually torque generation model changes the scheme that improves brake torque when making no power.But according to above-mentioned technology, respectively the nonequilibrium condition of middle torque can't be confirmed mutually, is difficult to guarantee certain brake torque in manufacture process, and can not get desired product.
The brake torque of rotor increased or suitably increases when the object of the invention was to make no power in this permanent-magnet type stepping motor, and made it stable.
Under above-mentioned purpose, stepping motor of the present invention comprises:
Rotor with cylindric permanent magnet;
Side by side on the direction of principal axis of described rotor, and be centered around 2 groups of stator winding of this rotor periphery;
In order to holding the hood-like housing of described rotor and described stator winding,
Each group in described 2 groups of stator winding, be included in last stator and following stator that central part has the broach shape magnetic pole relative with described permanent magnet that is bent to form, its centre of described upper and lower stator is provided with the coil that is centered around described magnetic pole periphery and is fixed on relative to each other on the described housing, so that this upper and lower stator described magnetic pole location alternate with each other separately
It is characterized in that, the following stator that is positioned at the stator winding of the recessed side of described housing is also used as described housing, its area total value of the magnetic pole of this recessed side stator winding, with respect to described recessed side stator winding axially side by side the area total value of magnetic pole of front side stator winding of another group form differently.
In the preferred embodiment, for increasing brake torque, narrow down by making magnet pole widths, it is littler than front side stator winding magnetic pole area total value also just to form recessed side stator winding magnetic pole area total value.
According to above-mentioned formation, because the torque curve between each stator winding and permanent magnet rotor changes, in two torque building-up processes, be set at the state that makes the torque addition, therefore can guarantee necessary brake torque.
Fig. 1 is the vertical cross-section diagram of stepping motor of the present invention.
Fig. 2 is the expanded view of 2 stator winding pole configuration.
Fig. 3 represents to produce the key diagram of torque according to the generation situation of each rotatable phase magnetic flux of rotor.
Fig. 4 represents to produce the key diagram of torque according to the generation situation of each rotatable phase magnetic flux of rotor.
Fig. 5 is the oscillogram of the torque curve that produces of stator winding separately.
Fig. 6 is the oscillogram of the torque curve that produces of stator winding separately.
Fig. 7 is the magnetic pole expanded view of another embodiment.
Fig. 8 is the magnetic pole expanded view of another embodiment.
Fig. 9 is the magnetic pole expanded view of another embodiment.
Figure 10 is a part of sectional view of housing bottom.
Figure 11 is a part of sectional view of housing bottom.
Figure 12 is the magnetic pole expanded view of another embodiment.
Fig. 1 shows stepping motor 1 of the present invention.This stepping motor 1 is by cylindric permanent magnet rotor 2, and 2 stator winding 3,4 that surround these rotor 2 peripheries constitute.
Above-mentioned rotor 2 is supported freely by rotary body 7 rotations that are also used as pinion 6 for axle 5.These rotary body 7 peripheries are in conjunction with annular permanent-magnet body 8.Here, permanent magnet 8 is as with alternately forming the N utmost point and the S utmost point at the periphery circumferencial direction shown in 7,8.
In addition, between the lid shell 10 of above-mentioned axle 5 end that is fixed on hood-like housing 9 and these housing 9 opening surfaces of obturation.And the rotation of above-mentioned pinion 6 passes to output shaft 14 through slowing down with gear 11, not shown idler gear, gear 13.Gear 11 is supported freely by axle 15 rotations.This 15 is supported by lid shell 10 and the dividing plate 17 that is inlaid in housing 9 inside, and output shaft 14 be by be formed on the dividing plate 17 bearing portion 18 be inlaid in the bearing portion 19 rotations support freely of cover on shell 10 holes.
And 2 stator winding 3,4 are respectively by ring- type stator 21,22,23,24, and pack between the stator 21,22, the coil 25,26 between the stator 23,24,36,37 assemblings of coil-winding pipe.Each stator 22,23,24 for putting into the size of housing 9 inside, forms magnetic pole 27,28,29,30 respectively in the interior circumferential portion relative with rotor 2 with stator 21 in the form of a ring together.These magnetic poles 27,28; Magnetic pole the 29, the 30th makes stator 21,22 separately; The part of the interior circumferential portion of stator 23,24 bends to the right angle, and is alternately relative under with the opposite state of N, the S extreme direction of rotor 2 peripheries.2 stator winding 3,4 only are offset at electrical angle under the state of pi/2 and dispose.Housing 9 is also used as stator 21 in the bottom like this.
As shown in Figure 2, the recessed side that specially makes hood-like housing 9 inside is that to set than housing 9 entrance sides be that stator 23,24 its magnetic pole 29,30 area total values of stator winding 4 of open side are also little to stator 21,22 its magnetic pole 27,28 area total values of the stator winding 3 of bottom side among the present invention.And vice versa.Promptly also can make 21,22 its magnetic pole 27, the 28 area total values that schedule of housing 9 bottom side stator winding 3 set also greatlyyer than stator 23,24 its magnetic pole 29,30 area total values of housing 9 open side stator winding 4, magnetic pole 27,28 width are littler than magnetic pole 29,30 width in the present embodiment, be set at about 1/2 width, thereby magnetic pole 27,28 area total values are littler than magnetic pole 29,30 area total values.
The generation situation of brake torque when next, Fig. 3, Fig. 4 illustrate no power with regard to stator winding 3,4 respectively.The magnetic flux that comes out from the N utmost point of rotor 2, with the difference of rotor 2 position of rotation, or only by any one turns back to the S utmost point in the magnetic pole 27,28,29,30; Or, turn back to the S utmost point through magnetic pole 27 again by reverse magnetic pole 28 arrival housings 9; Arrive housing 9 by reverse magnetic pole 27, turn back to the S utmost point through magnetic pole 28 again; Or, turn back to the S utmost point through magnetic pole 29 again by reverse magnetic pole 30 arrival housings 9; Arrive housing 9 by reverse magnetic pole 29, turn back to the S utmost point through magnetic pole 30 again.Order is φ by the closed magnetic flux of one of magnetic pole 27,28,29,30 only
a, the magnetic flux of by magnetic pole 27,28,29,30 two and housing 9 is then by φ
bExpression is by this magnetic flux φ
a, φ
b, the torque that just produces CW (clockwise direction) or CCW (counterclockwise) on the rotor 2.
For the magnetic pole 29,30 of stator winding 4 wider width, as shown in Figure 3, in order to make magnetic flux φ
aThan other magnetic flux φ
bGreatly, rotor 2 stops at shown position, and this moment, torque direction and size thereof were as Fig. 5 curve.Torque curve along the lower right to its electrical angle of some θ=0, π, 2 π, 3 π by the torque zero line ...On the other hand, for the narrower magnetic pole 27,28 of stator winding 3 width, as shown in Figure 4, in order to make magnetic flux φ
bThan other magnetic flux φ
aGreatly, thus rotor 2 stop at and form this magnetic flux φ
bThe position on.Therefore, as Fig. 6, torque curve along the lower right to its electrical angle of some θ=0, π, 2 π, 3 π by the torque zero line ...Therefore, the synthetic torque that schedules winding 3,4 is the brake torque of rotor 2, by above-mentioned 2 torque curve additions, becomes higher value.In addition, among Fig. 6, the situation when the dotted line torque curve shows magnetic pole 27,28 wider width.
Here, in order to obtain bigger brake torque, because housing 9 is 1 cover patterns, thereby recessed side (housing 9 bottom sides) stator winding 3 its magnetic pole 27,28 areas must constitute littler than these 9 front sides (open side) stator winding 4 its magnetic pole 29,30 areas of shell.Its reason is that in recessed side stator winding 3, stator 21 is an one with housing 9, magnetic flux φ
bOne place's contact portion is arranged on the path, thereby the magnetic resistance in this path is less, thus the torque curve that can be worth as shown in Figure 6.On the other hand, phase for housing 9 entrance sides of 1 cover pattern, if two stators 23,24 of stator winding 4 all have contact portion with outside housing 9, make closed magnetic resistance bigger by outside housing 9, when making magnetic pole 29,30 width narrower, the torque curve that can't obtain to be worth shown in Fig. 6 just, thereby be difficult to obtain required function.
Fig. 7, Fig. 8, Fig. 9 show to obtaining than large braking torque, and make recessed side stator winding 3 its magnetic pole 27,28 area total values form than other little means of front side stator winding 4 its magnetic pole 29,30 area total values.Shown in Fig. 7 is the example that only makes the magnetic pole 28 narrowed width formation of stator 22, also have shown in Fig. 8 is the example that magnetic pole 27 parts of stator 21 are constituted for narrower width, also having shown in Fig. 9 is to make the magnetic pole 27,28,29 of stator 21,22,23 be same widths, and the magnetic pole 30 a part of width that only make another stator 24 broaden and the example that constitutes.Certainly, even these magnetic poles 27,28,29,30 are not only trapezoidal rectangle or other shapes are also passable.
In addition, Figure 10,11 shows other structures of hood-like housing 9.Shown in Figure 10 is the outer peripheral portion formation protuberance at 9 ends of simple shape housing, constitutes stator 21 with other parts, and the class methods that are pressed into by large tracts of land make both faces contacts, carry out the example that magnetic knot closes better.Also having shown in Figure 11 is that the lateral surface of contact site and stator 21 is collided, the example of being fixed by welding.Among these embodiment, housing 9 finally forms hood-like body with other parts.
Next, Figure 12 embodiment makes the area total value of 2 stators, 22,23 its utmost point teeth 27,28 on one side that dispose back-to-back between the coil-winding pipe 25,26 and the different formation of area total value of another side utmost point tooth 29,30, be to make the area total value of 3 utmost point teeth 27,28,30 identical specifically, make utmost point tooth 29 areas of another side less.The motor of this structure is equivalent to replace the motor of Fig. 7 concrete example stator 22,23 in the motor assembling process.Thereby, the effect that can select 2 different braking torques is just arranged as long as only replace the assembling position of 2 stators 22,23, can be according to the motor purposes with suitably corresponding.
Among the present invention, it is big that the brake torque during no power becomes, and the hold facility of stop position strengthens, thereby, even the part that stepping motor drives is subjected to the power and the also not past revolution of load of involution direction.And this bigger brake torque obtains simply because of the difference that magnetic flux forms, but and does not have disorder, stable brake torque on the acquired character.
Specifically, the present invention utilizes the difference of flux circuit generation type, each phase torque addition is synthesized guarantee brake torque, thereby compare with existing routine motor, can guarantee bigger brake torque effectively.
Claims (3)
1. stepping motor comprises:
Rotor (2) with cylindric permanent magnet (8);
Side by side on the direction of principal axis of described rotor (2), and be centered around 2 groups of stator winding (3,4) of this rotor (2) periphery;
In order to holding the hood-like housing (9) of described rotor (2) and described stator winding (3,4),
Described 2 groups of stator winding (3,4) each group in, be included in central part and have the broach shape magnetic pole (27,28,29 relative that is bent to form with described permanent magnet (8), 30) last stator and following stator (22 and 21,24 and 23), its middle being provided with of described upper and lower stator (22 and 21,24 and 23) is centered around described magnetic pole (27,28,29,30) coil of periphery (25,26) is fixed on the described housing (9) relative to each other, so that this upper and lower stator (22 and 21,24 and 23) described magnetic pole (27,28,29 separately, 30) location alternate with each other
It is characterized in that, the following stator (21) that is positioned at the stator winding (3) of the recessed side of described housing (9) is also used as described housing (9), the magnetic pole (27 of this recessed side stator winding (3), 28) its area total value, with with respect to described recessed side stator winding (3) axially side by side the area total value of magnetic pole (29,30) of front side stator winding (4) of another group form differently.
2. stepping motor as claimed in claim 1 is characterized in that, its area total value of recessed side stator winding (3) magnetic pole (27,28) forms littler than the area total value of front side stator winding (4) magnetic pole (29,30).
3. stepping motor as claimed in claim 2 is characterized in that, reduces the magnetic pole area by magnet pole widths is narrowed down.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP198928/92 | 1992-07-03 | ||
| JP19892892 | 1992-07-03 | ||
| JP145514/93 | 1993-05-25 | ||
| JP5145514A JP2640073B2 (en) | 1992-07-03 | 1993-05-25 | Stepping motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1084682A CN1084682A (en) | 1994-03-30 |
| CN1044955C true CN1044955C (en) | 1999-09-01 |
Family
ID=26476608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93108135A Expired - Lifetime CN1044955C (en) | 1992-07-03 | 1993-06-30 | Step-by-step motor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2640073B2 (en) |
| KR (1) | KR0137193B1 (en) |
| CN (1) | CN1044955C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2982787B2 (en) | 1998-04-28 | 1999-11-29 | 日本精機株式会社 | Stepping motor type indicating instrument |
| JP4252988B2 (en) * | 2005-11-18 | 2009-04-08 | ミネベアモータ株式会社 | Stepping motor for vibration generation |
| JP4295329B2 (en) | 2007-03-30 | 2009-07-15 | ミネベアモータ株式会社 | Stepping motor |
| JP2009207298A (en) | 2008-02-28 | 2009-09-10 | Minebea Motor Manufacturing Corp | Stepping motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043059A (en) * | 1983-08-19 | 1985-03-07 | Nippon Denso Co Ltd | Step motor |
| EP0474048A1 (en) * | 1990-08-27 | 1992-03-11 | Canon Kabushiki Kaisha | Stepping motor and method for driving the same |
-
1993
- 1993-05-25 JP JP5145514A patent/JP2640073B2/en not_active Expired - Fee Related
- 1993-06-19 KR KR1019930011237A patent/KR0137193B1/en not_active IP Right Cessation
- 1993-06-30 CN CN93108135A patent/CN1044955C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043059A (en) * | 1983-08-19 | 1985-03-07 | Nippon Denso Co Ltd | Step motor |
| EP0474048A1 (en) * | 1990-08-27 | 1992-03-11 | Canon Kabushiki Kaisha | Stepping motor and method for driving the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1084682A (en) | 1994-03-30 |
| KR0137193B1 (en) | 1998-06-15 |
| KR940008198A (en) | 1994-04-29 |
| JP2640073B2 (en) | 1997-08-13 |
| JPH0678513A (en) | 1994-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: NIDEC SANKYO CORP. Free format text: FORMER NAME OR ADDRESS: SANKYO SEIKI MFG. SEISAKUSHO K.K. |
|
| CP03 | Change of name, title or address |
Address after: Japan's Nagano Patentee after: Sankyo Seiki Seisakusho KK Address before: Japan's Nagano Patentee before: Sankyo Seiki Manufacturing Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130630 Granted publication date: 19990901 |