TWI839559B - 磁式編碼器 - Google Patents
磁式編碼器 Download PDFInfo
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- TWI839559B TWI839559B TW109126897A TW109126897A TWI839559B TW I839559 B TWI839559 B TW I839559B TW 109126897 A TW109126897 A TW 109126897A TW 109126897 A TW109126897 A TW 109126897A TW I839559 B TWI839559 B TW I839559B
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
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- G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
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- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
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- G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
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Abstract
本發明提供一種磁式編碼器(10),其係具備:第一構件(48),係包含形成有供旋轉體(14)插通之插通孔(54)的第一壁部;及第二構件(52),係包含第二壁部(56)。該等第一壁部(48)與第二壁部(56)之間係隔著永久磁鐵(42)、以及檢測該永久磁鐵(42)所致之磁場變化之磁性感測器(44)。此構成中,第一構件(48)及第二構件(52)係由最多含有3.0重量%之碳之軟鋼構成。
Description
本發明有關於用以檢測旋轉體的旋轉角之磁式編碼器。
眾所周知,磁式編碼器係具有永久磁鐵與磁性感測器,且為廣泛地使用作為檢測旋轉體的位置、旋轉角的裝置。如日本特開2019-015536號公報記載所示,永久磁鐵會隨著固定在馬達之旋轉軸的旋轉體的旋轉而旋轉。藉由此旋轉,會使由該永久磁鐵所形成的磁場產生變化。磁性感測器會檢測此磁場變化。結果,求出旋轉軸的旋轉角(乃至於旋轉量)。
此種構成中,永久磁鐵、磁性感測器受到外部磁場的影響時,檢測值會成為與實際的旋轉角不同的值。亦即,旋轉角的檢測結果之精確度會降低。日本特開2015-001511號公報中提出一種技術,為了避免此種情形,而在覆蓋磁式編碼器之編碼器蓋之內部設置磁性屏蔽構件,藉由該構件來遮斷外部磁場。再者,日本特開2015-001511號公報中,例示以冷軋鋼板、高導磁合金(permalloy)等作為磁性屏蔽構件的素材。
最近,對於來自外部之磁場影響的環境,有進一步提升磁式編碼器之旋轉體的旋轉角的檢測精確度之需求。
本發明之主要目的在於提供一種可減低來自外部之磁場的影響的磁式編碼器。
本發明之另一目的在於提供一種進一步提升檢測精確度的磁式編碼器。
根據本發明一實施形態,提供一種磁式編碼器,其具有永久磁鐵與磁性感測器,該永久磁鐵係隨著構成旋轉驅動部的旋轉體旋轉而旋轉,該磁性感測器係檢測前述永久磁鐵的磁場變化,
該磁式編碼器係具備:
第一構件,係包含形成有供前述旋轉體插通之插通孔的第一壁部;及
第二構件,係包含與前述第一壁部之間隔著前述永久磁鐵及前述磁性感測器的第二壁部;
前述第一構件及前述第二構件係由最多含有3.0重量%之碳的軟鋼構成。
根據本發明,分別包含第一壁部、第二壁部之第一構件、第二構件係由最多含有3.0重量%之碳的軟鋼構成,該第一壁部、第二壁部係於其間隔著永久磁鐵及磁性感測器(亦即,該第一壁部、第二壁部係將永久磁鐵及磁性感測器包夾在其間)。該等第一構件及第二構件係作為磁性遮斷部而發揮功能,因此,可藉由第一構件及第二構件遮斷例如設置磁式編碼器之馬達所產生的磁場、其它機器所產生的外部磁場等。
亦即,此時,可抑制外部磁場的影響及於永久磁鐵及磁性感測器。因此,由磁性感測器所檢測之磁場的大部分係永久磁鐵所形成的磁場。
如此,根據上述構成,在已遮斷外部磁場等的狀況下,可利用磁性感測器檢測永久磁鐵所致之磁場變化。因而可精確度良好地求出以永久磁鐵的磁場變化為依據之旋轉體的旋轉角。亦即,可提升關於旋轉體的旋轉角的檢測精確度。
依據參照圖式之以下的較佳實施形態例之說明,當可更明瞭上述的目的、特徵及優點。
10:編碼器
12:馬達
14:旋轉軸
16:底蓋
18:頂蓋
20:定子
22:轉子
24:第一收容凹部
26:第二收容凹部
28:第一貫通孔
30:第二貫通孔
32:第一軸承
34:第二軸承
40:內室
42:永久磁鐵
44:磁性感測器
46:殼體
48:閉塞構件
50:狹縫
52:筒狀構件
54:插通孔
56:頂板部
58:側板部
60:窗部
62:保持具
64:圓環狀凸部
66:保持用凹部
70:感測器基板
72:內部罩殼
90:編碼器
100:平板構件
102:編碼器
104:罩殼
106:內室
CL:間隙
T:厚度
圖1係設有本發明實施形態之磁式編碼器的馬達(旋轉驅動部)的概略整體前視圖。
圖2係圖1中之II-II線箭頭方向剖面圖。
圖3係構成圖1之磁式編碼器之筒狀構件的概略展開圖。
圖4係從圖3使側板部彎曲所獲得之筒狀構件的概略立體圖。
圖5係設有省略內部罩殼之磁式編碼器的馬達的概略縱剖面圖。
圖6係設有其他實施形態之磁式編碼器的馬達的概略縱剖面圖。
以下,針對本發明之磁式編碼器,列舉較佳實施形態,參照圖式詳細說明。再者,以下說明中之「下」及「上」係對應於圖1及圖2中之下方、上方,但此係用以適當地簡化說明以容易理解,並非用以具體指定使用磁式編碼器之際的姿勢。此外,以下,有時也會將磁式編碼器簡單記載為「編碼器」。
圖1及圖2分別為設有本實施形態之磁式編碼器10的馬達12(旋轉驅動部)的概略整體前視圖及圖1中之II-II線箭頭方向剖面圖。編碼器10係具有檢測馬達12之旋轉軸14(旋轉體)的旋轉角之功能。
首先,針對馬達12概略說明。馬達12係具有由底蓋16與頂蓋18包夾之定子20、及收容於該定子20之中空內部的轉子22(參照圖2)。眾所周知,定子20係設有隨著通電而帶有磁性之未圖示的電磁線圈。另一方面,轉子22係設有未圖示的永久磁鐵。再者,定子20係由於四面之外壁而呈大致四角柱形狀。此外,該定子20之中空內部係呈挖空圓柱體的形狀而成為與長邊方向正交之方向的剖面呈大致正圓形。
底蓋16及頂蓋18係分別形成有大徑的第一收容凹部24、第二收容凹部26、以及連接於該第一收容凹部24與該第二收容凹部26的第一貫通孔28、第二貫通孔30。第一貫通孔28、第二貫通孔30係設定為比第一收容凹部24、第二收容凹部26小徑,另外,第二貫通孔30係設定為比第一貫通孔28大徑。而且,第一收容凹部24、第二收容凹部26中分別收容有第一軸承32、第二軸承34。
轉子22係設有作為旋轉體之旋轉軸14。旋轉軸14之下端部及上端部係分別從轉子22之下端面及上端面露出,並且朝向底蓋16、頂蓋18延伸。其中之下端部係穿通第一軸承32及第一貫通孔28而從底蓋16露出。再者,旋轉軸14可為實心,也可為空心。
另一方面,上端部係貫通第二軸承34及第二貫通孔30,其端部係從頂蓋18露出於外部。上端部之最前端係進入於後述之內室40。
接著,針對本實施形態之編碼器10進行說明。該編碼器10係具備:保持具62,係設在旋轉軸14的最前端;檢測用的永久磁鐵42,係嵌合於形成在該保持具62之上端面的保持用凹部66;磁性感測器44,係保持在感測器基板70而配設成與該永久磁鐵42之一部分相向;及殼體46,係區隔出收容該等永久磁鐵42及磁性感測器44的內室40。
殼體46係藉由組合作為第一構件之閉塞構件48與筒狀構件52(第二構件)而構成,該閉塞構件48係具有呈大致正方形之壁部(第一壁部),該筒狀構件52係近似於短的四角筒形狀,且在轉角部形成有狹縫50。亦即,此時,筒狀構件52的下端為開口端。藉由以閉塞構件48閉塞此開口端而在筒狀構件52的內部形成內室40。
閉塞構件48係沿其厚度方向形成有插通孔54。旋轉軸14的最前端係穿通該插通孔54而進入於內室40。旋轉軸14與形成插通孔54之壁部之間的間隙CL較佳為3mm以內。這是因為間隙CL超過3mm時,會有馬達12所產生的磁場通過間隙CL而進入內室40的顧慮,換言之,此時,不容易藉由閉塞構件48遮斷內室40之外部的磁性。
如顯示筒狀構件52之概略展開圖的圖3所示,筒狀構件52係具有頂板部56(第二壁部)、以及個別地對於該頂板部56連接的五個側板部58。如圖2所示,永久磁鐵42及磁性感測器44係配設成包夾於閉塞構件48(第一壁部)與頂板部56(第二壁部)之間。
為了獲得筒狀構件52,係對於由後述之軟鋼構成的板材進行衝切加工,藉此獲得圖3所示之形狀的中間成形體,接著,將側板部58折彎大致90°
以使側板部58大致正交於頂板部56。藉此,如圖4所示,獲得側板部58彼此之間形成有狹縫50的筒狀構件52。
在折彎後之短的二個側板部58彼此之間形成有窗部60。此窗部60係穿通有用以將磁性感測器44與演算部電性連接的信號線。在此未圖示演算部及信號線。
在此,閉塞構件48及筒狀構件52係由最多含有3.0重量%之碳的軟鋼構成。這是因為軟鋼容易實施成形加工,因而可容易獲得筒狀構件52等。就此種軟鋼之較佳例而言,可列舉冷軋軟鋼板、熱軋軟鋼板等。就冷軋軟鋼板而言,可例示SPCC、SPCD、SPCE、SPCF、SPCG,就熱軋軟鋼板而言,可例示SPHC、SPHD、SPHE、SPHF。再者,SPCC、SPCD、SPCE、SPCF、SPCG係日本工業規格JIS G 3141中規定的材料記號,SPHC、SPHD、SPHE、SPHF係JIS G 3131中規定的材料記號。
尤其是,SPCC較佳。這是因為SPCC價格便宜且容易取得。亦即,採用SPCC時,可低成本地製作殼體46。
一般來說,就構成磁性遮斷部的素材而言,係選擇導磁率較大而易於磁化者。相對於此,上述之軟鋼的相對導磁率皆未達5000,與高導磁合金、純鐵、矽鐵等的磁性材料相比,明顯較小。亦即,軟鋼缺乏吸收磁通的能力,難以磁化。然而,本實施形態中,由軟鋼所構成的殼體46係作為遮斷外部的磁性而妨礙該磁性到達內室40之磁性遮斷部而發揮功能。
筒狀構件52及閉塞構件48換言之即殼體46較佳為其保磁力在3Oe以下。亦即,殼體46係在外部的磁場消除時容易喪失磁性(磁力)之軟磁性體。為了使筒狀構件52及閉塞構件48的保磁力成為3Oe以下,可對於SPCC之
類的軟鋼實施磁性退火。由素材(軟鋼板)經成形加工等而獲得之殼體46的金屬組織中,會有金屬粒粗大化、產生粒徑的不均一化等情形。然而,藉由實施磁性退火,可將金屬粒微細化且使粒徑收斂成大致均等。藉此,消除因加工等所致之殘留應變,且使保磁力降低至3Oe以下。
筒狀構件52及閉塞構件48的厚度T較佳為設定於0.5至2mm。未達0.5mm時,會因為壁厚較薄而使磁性容易通過筒狀構件52及閉塞構件48。亦即,此種情況就不容易遮斷外部的磁性。此外,若超過2mm時,殼體46的壁厚較厚而使重量變大。另外,若筒狀構件52及閉塞構件48的厚度T為0.5至2mm,則磁性難以通過此種壁厚較厚的筒狀構件52、閉塞構件48。從而,該等筒狀構件52及閉塞構件48可充分地遮斷殼體46外的磁場。
進入內室40之旋轉軸14之上端部的最前端係設有呈大致圓板形狀的保持具62。具體而言,保持具62的下端面係突出形成有圓環狀凸部64,且旋轉軸14之上端部係嵌合在該圓環狀凸部64的圓形之中空內部。另一方面,保持具62之上端面係形成有底的保持用凹部66。檢測用的永久磁鐵42係嵌合於該保持用凹部66而保持在保持具62。
內室40係收容有感測器基板70,且在該感測器基板70設有前述磁性感測器44。如前所述,磁性感測器44係與永久磁鐵42的一部分相向。磁性感測器44係經由前述信號線而電性連接於前述演算部,且經由該信號線對前述演算部傳送檢測信號。
內室40收容有呈角筒形狀且由樹脂所構成之內部罩殼72。保持具62、永久磁鐵42、感測器基板70及磁性感測器44係收容在內部罩殼72之中空內部。換言之,內部罩殼72係圍繞於保持具62、永久磁鐵42、感測器基板70
及磁性感測器44。內部罩殼72係形成有連接窗部60之未圖示的連通孔,連接磁性感測器44與演算部的前述信號線係從連通孔及窗部60朝內室40的外部引出。
針對編碼器10之製造過程略為說明。製作筒狀構件52時,係如上所述,使用由軟鋼(例如SPCC)所構成之板材進行衝切加工,而獲得圖3所示之形狀的中間成形體。接著,將側板部58相對於頂板部56折彎大致90°成為大致正交,而成為筒狀構件52。素材為SPCC時,特別容易進行衝切加工及折彎。閉塞構件48也同樣可藉由使用由軟鋼所構成的板材作為素材的衝切加工而獲得。
另外,還對於該等筒狀構件52及閉塞構件48實施磁性退火。磁性退火的處理條件較佳係設定為使筒狀構件52及閉塞構件48的保磁力成為3Oe以下。在此,代表性的碳鋼之S45C係約41Oe左右之較大的保磁力。此外,即使對含碳量為0.5重量%的低碳鋼施加退火,保磁力仍為約8Oe。由此可知,殼體46的保磁力比一般的碳鋼小。
接著,將內部罩殼72收容於經實施磁性退火的筒狀構件52內,另外,將感測器基板70及磁性感測器44收容於該內部罩殼72之中空內部。另一方面,在頂蓋18之上端面配設閉塞構件,將旋轉軸14之上端部的最前端穿通於插通孔54後,將保持有永久磁鐵42的保持具62安裝於該最前端。當然地,此時,將旋轉軸14之上端部嵌合於設在保持具62的下端面之圓環狀凸部64之中空內部。
接著,將筒狀構件52覆於閉塞構件48,經由螺絲等未圖示的連結構件接合筒狀構件52與閉塞構件48。藉此,構成編碼器10。
本實施形態之編碼器10基本係如上所述而構成者,接著,針對其作用功效說明。
編碼器10係檢測旋轉軸14的旋轉角。亦即,對於構成定子20的電磁線圈通電時,伴隨於此,於定子20產生交變磁場。由於此交變磁場與轉子22中的永久磁鐵所產生的磁場之間發生相斥與相吸,而使轉子22與旋轉軸14一體地旋轉。在此,由於旋轉軸14與底蓋16、頂蓋18之間裝設有第一軸承32及第二軸承34,故底蓋16、頂蓋18、定子20不會隨之旋轉。
隨著旋轉軸14的旋轉,設在其上端部的最前端之保持具62亦旋轉,同時,保持在該保持具62之檢測用的永久磁鐵42亦旋轉。該永久磁鐵42係配置成複數個N極與S極沿著環繞方向交互地出現。從而,當永久磁鐵42旋轉時,N極與S極係交互地與磁性感測器44相向。因此,永久磁鐵42所形成的磁場係在磁性感測器44的附近變化。隨著此磁場變化,從磁性感測器44經由前述信號線傳送至前述演算部的檢測信號亦變化。
演算部係依據檢測信號之變化而認知磁場之變化,依據變化的次數、程度等,藉由演算而求出旋轉軸14的旋轉角。藉此,檢測旋轉軸14的旋轉角。
在此,馬達12中係如上所述,由電磁線圈及永久磁鐵產生磁場。然而,此磁場係由閉塞構件48所遮蔽。亦即,藉由閉塞構件48可有效地防止馬達12中所產生的磁場對內室40內的永久磁鐵42及磁性感測器44造成影響。
此外,可預料編碼器10使用於殼體46的附近配置有會產生外部磁場的機器(其他的馬達、電磁線圈等)之狀況,但此狀況下,筒狀構件52會遮
蔽外部磁場。換言之,藉由筒狀構件52可有效地防止殼體46外產生的外部磁場對內室40內的永久磁鐵42及磁性感測器44造成影響。
此外,藉由將筒狀構件52及閉塞構件48的厚度T設定為0.5至2mm,也可有效地對內室40遮斷馬達12中所產生的磁場及外部磁場。另外,將形成插通孔54的壁部與旋轉軸14之間的間隙CL設定為3mm以下時,可防止馬達12中所產生的磁場經由插通孔54進入於內室40。
如上所述地構成時,可充分地抑制永久磁鐵42、磁性感測器44受到馬達12中產生的磁場及外部磁場的影響。從而,成為磁性感測器44之檢測信號的大部分係以由檢測用的永久磁鐵42所產生的磁場為依據者。由於演算部係依據檢測信號來檢測旋轉軸14的旋轉角,故可精確度良好地求出旋轉軸14的旋轉角。亦即,旋轉角的檢測精確度良好。
典型地,比較使用未實施磁性退火之殼體而構成的編碼器所求出之角度誤差、以及使用實施磁性退火而使保磁力成為3Oe以下之殼體46而構成的編碼器10所求出之角度誤差時,後者為前者的大致1/2。由此可知,殼體46係作為磁性遮斷部而有效地發揮功能。在此,角度誤差係從檢測旋轉角減去實際旋轉角而算出之值。
如此,根據將永久磁鐵42及磁性感測器44收容於經實施磁性退火之殼體46的內室40的本實施形態,該殼體46係作為磁性遮斷部而發揮功能,故可使關於旋轉軸14的旋轉角的檢測精確度提升。
此外,由於在內室40內配置內部罩殼72,故可藉由該內部罩殼72來保護永久磁鐵42及磁性感測器44不受塵埃等異物侵襲。因此,可避免異物捲入第二軸承34的情形等。
旋轉角的檢測結束後,停止對於電磁線圈的通電。結果,轉子22及旋轉軸14的旋轉停止。伴隨於此,馬達12所形成的磁場消失。閉塞構件48在其保磁力為較小的3Oe以下的情況,當構成馬達12的定子20所形成的磁場消失時,相應地會迅速地喪失磁性。因此,難以於閉塞構件48殘留較大的磁性。從而,下次檢測旋轉角時,可盡可能地抑制殘留於閉塞構件48之磁性對於永久磁鐵42、磁性感測器44造成影響。
筒狀構件52也同樣地,在保磁力為較小的3Oe以下的情況下,外部磁場消失時會迅速地喪失磁性。亦即,此時,磁性難以殘留在筒狀構件52。從而,在下次的旋轉角的檢測時,可避免永久磁鐵42及磁性感測器44受到殘留於筒狀構件52之磁性的影響。
如以上所述,藉由減小殼體46的保磁力,可在下次的旋轉角的檢測時精確度良好地求出旋轉角。
本發明不特別限定於上述實施形態,可在不脫離本發明之主旨的範圍進行種種變更。
例如,亦可藉由深抽成形而製作筒狀構件52。此時,可獲得未形成狹縫50的筒狀構件52。
而且,亦能夠以筒狀構件52作為第一構件,且以閉塞構件48作為第二構件。此時,可使筒狀構件52的開口端朝向圖1及圖2的上方。
此外,樹脂製的內部罩殼72並非必要構件,亦可如圖5所示,省略內部罩殼72而構成編碼器90。
另外,此實施形態中例示了使用筒狀構件52作為第二構件的情況,但亦可如圖6所示,使用僅具有平板形狀之第二壁部的平板構件100作為第
二構件而構成編碼器102。此時,可利用由樹脂構成之四角筒形狀的罩殼104以及將該罩殼104的開口端閉塞的閉塞構件48來形成內室106,且在該內室106內收容永久磁鐵42及磁性感測器44。
此時,閉塞構件48與平板構件100係作為磁性遮斷部而發揮功能。亦即,此實施形態中,亦可獲得與圖1至圖5所示的編碼器10、90同樣的功效。
任一實施形態中,皆可經由齒輪、滑輪等旋轉構件而對於旋轉軸14的下端部間接地或直接連結其他的旋轉體(旋轉構件)。此時,藉由檢測馬達12之旋轉軸14的旋轉角,可間接地求出旋轉體的旋轉角。
10:編碼器
12:馬達
14:旋轉軸
16:底蓋
18:頂蓋
20:定子
22:轉子
24:第一收容凹部
26:第二收容凹部
28:第一貫通孔
30:第二貫通孔
32:第一軸承
34:第二軸承
40:內室
42:永久磁鐵
44:磁性感測器
46:殼體
48:閉塞構件
52:筒狀構件
54:插通孔
56:頂板部
58:側板部
62:保持具
64:圓環狀凸部
66:保持用凹部
70:感測器基板
72:內部罩殼
CL:間隙
T:厚度
Claims (6)
- 一種磁式編碼器(10),係具有永久磁鐵(42)與磁性感測器(44),該永久磁鐵(42)係隨著構成旋轉驅動部(12)的旋轉體(14)之旋轉而旋轉,該磁性感測器(44)係檢測前述永久磁鐵的磁場變化,該磁式編碼器(10)係具備:第一構件(48),係包含形成有供前述旋轉體插通之插通孔(54)的第一壁部;及第二構件(52),係包含與前述第一壁部之間隔著前述永久磁鐵及前述磁性感測器的第二壁部(56);前述第一構件及前述第二構件係由最多含3.0重量%的碳且保磁力為3Oe以下之軟鋼構成。
- 如請求項1所述之磁式編碼器,其中前述第一構件及前述第二構件係由冷軋軟鋼板構成。
- 如請求項1或2所述之磁式編碼器,其中前述第一構件及前述第二構件的厚度為0.5至2mm。
- 如請求項1或2所述之磁式編碼器,其中前述旋轉體與形成前述插通孔之前述第一壁部之間的間隙為3mm以內。
- 如請求項1或2所述之磁式編碼器,其中前述第一構件與前述第二構件之間設有收容前述永久磁鐵及前述磁性感測器的罩殼(72)。
- 如請求項1或2所述之磁式編碼器,其中前述第一構件或前述第二構件之一者係由一端為開口端的筒狀構件構成,另一者為將前述開口端閉塞的閉塞構件。
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TW109126897A TWI839559B (zh) | 2019-08-09 | 2020-08-07 | 磁式編碼器 |
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US (1) | US12007235B2 (zh) |
EP (1) | EP4012354A4 (zh) |
JP (1) | JP7533464B2 (zh) |
KR (1) | KR20220031092A (zh) |
CN (1) | CN114207383A (zh) |
BR (1) | BR112022002403A2 (zh) |
MX (1) | MX2022001636A (zh) |
TW (1) | TWI839559B (zh) |
WO (1) | WO2021029305A1 (zh) |
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- 2020-08-05 MX MX2022001636A patent/MX2022001636A/es unknown
- 2020-08-05 CN CN202080056253.4A patent/CN114207383A/zh active Pending
- 2020-08-05 US US17/633,822 patent/US12007235B2/en active Active
- 2020-08-05 JP JP2021539237A patent/JP7533464B2/ja active Active
- 2020-08-05 EP EP20852831.5A patent/EP4012354A4/en active Pending
- 2020-08-05 WO PCT/JP2020/030068 patent/WO2021029305A1/ja unknown
- 2020-08-05 BR BR112022002403A patent/BR112022002403A2/pt unknown
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JPWO2021029305A1 (zh) | 2021-02-18 |
EP4012354A1 (en) | 2022-06-15 |
US12007235B2 (en) | 2024-06-11 |
BR112022002403A2 (pt) | 2022-04-26 |
MX2022001636A (es) | 2022-03-11 |
JP7533464B2 (ja) | 2024-08-14 |
US20220299306A1 (en) | 2022-09-22 |
KR20220031092A (ko) | 2022-03-11 |
CN114207383A (zh) | 2022-03-18 |
TW202113309A (zh) | 2021-04-01 |
EP4012354A4 (en) | 2023-08-02 |
WO2021029305A1 (ja) | 2021-02-18 |
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