JPH0842613A - Electromagnetic brake quality determination device - Google Patents
Electromagnetic brake quality determination deviceInfo
- Publication number
- JPH0842613A JPH0842613A JP18146194A JP18146194A JPH0842613A JP H0842613 A JPH0842613 A JP H0842613A JP 18146194 A JP18146194 A JP 18146194A JP 18146194 A JP18146194 A JP 18146194A JP H0842613 A JPH0842613 A JP H0842613A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- voltage
- electromagnetic brake
- time
- difference
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/005—Force, torque, stress or strain
Landscapes
- Braking Arrangements (AREA)
Abstract
(57)【要約】
【目的】 電磁ブレーキの起動時間を測定し、この起動
時間を基準の環境状態に補正することにより、正確に電
磁ブレーキの良否を判定する電磁ブレーキの良否判定装
置の提供。
【構成】 直流電源８の電源電圧ＥＸを検知し、この電
圧ＥＸと基準電圧ＥＳとの電圧差を演算する電圧差演算
手段３１と電磁コイル６の温度を検知し、この温度ＴＸ
と基準温度ＴＳとの温度差を演算する温度差演算手段３
３と励磁電流を検知し、起動時間ＥＸを演算する起動時
間演算手段２１と前記電圧差演算手段３１と前記温度差
演算手段３３との出力から電磁ブレーキの起動時間ＥＸ
を基準電圧ＥＳおよび基準温度ＴＳの環境状態に補正す
る起動時間補正手段４０と補正された起動時間ｔＹと基
準時間ｔＳとの差が所定値ｔＤを越えたとき前記電磁ブ
レーキを異常と判定する手段を備えたものである。
(57) [Abstract] [Purpose] To provide a device for determining the quality of an electromagnetic brake that accurately determines the quality of the electromagnetic brake by measuring the startup time of the electromagnetic brake and correcting the startup time to a standard environmental condition. [Structure] A temperature difference between a voltage difference calculation means 31 for detecting a power supply voltage EX of a DC power supply 8 and a voltage difference between the voltage EX and a reference voltage ES and a temperature of an electromagnetic coil 6 is detected, and this temperature TX is detected.
Temperature difference calculating means 3 for calculating the temperature difference between the reference temperature TS and the reference temperature TS
3 and the exciting current, the start time EX for calculating the start time EX, the start time EX of the electromagnetic brake from the outputs of the start time calculation means 21, the voltage difference calculation means 31, and the temperature difference calculation means 33.
Means for determining the environmental conditions of the reference voltage ES and the reference temperature TS and means for determining the electromagnetic brake as abnormal when the difference between the corrected start time tY and the reference time tS exceeds a predetermined value tD. It is equipped with.
Description
【０００１】[0001]
【産業上の利用分野】本発明は直流電源で励磁する電磁
ブレーキの良否判定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for judging the quality of an electromagnetic brake excited by a DC power supply.
【０００２】[0002]
【従来の技術】一般に、電磁ブレーキは、常時は制動ば
ねを介してブレーキシューがブレーキドラムを押圧し、
制動状態となっている。そして、電磁ブレーキの動作指
令により直流の励磁電流が流れ、この励磁電流は指数関
数的に上昇する。そして、この励磁電流がある電流値
（通常定格励磁電流の６０％）に達すると、ブレーキシ
ューが開き、電磁ブレーキは釈放状態となる。2. Description of the Related Art Generally, in an electromagnetic brake, a brake shoe normally presses a brake drum via a braking spring,
It is in a braking state. Then, a DC exciting current flows according to the operation command of the electromagnetic brake, and this exciting current rises exponentially. When this exciting current reaches a certain current value (60% of the normal rated exciting current), the brake shoe opens and the electromagnetic brake is released.
【０００３】ところで、この電磁ブレーキの動作指令よ
り、ブレーキシューが動作し始めるまでの起動時間は、
ブレーキシューの摩耗やブレーキ機構のがたにより変化
する。そこで、特開昭６２−９１３５７号公報によれ
ば、前記起動時間を実測し、その測定値とあらかじめ設
定された基準時間とを比較し、この時間差が所定値を越
えたとき、この電磁ブレーキは異常と判定する装置が提
案されている。By the way, according to the operation command of the electromagnetic brake, the starting time until the brake shoe starts to operate is
Changes due to wear of brake shoes and rattling of the brake mechanism. Therefore, according to Japanese Patent Laid-Open No. 62-91357, the starting time is actually measured, the measured value is compared with a preset reference time, and when the time difference exceeds a predetermined value, the electromagnetic brake operates. A device for determining an abnormality has been proposed.
【０００４】[0004]
【発明が解決しようとする課題】上記従来技術におい
て、ブレーキシューが開き始める瞬間の励磁電流値が一
定であっても、電源電圧の変動や、電磁コイルの温度に
よる抵抗変化により励磁電流の立上り速度が変化し、そ
の結果、起動時間も変化し、電磁ブレーキの良否を誤判
定するおそれがあった。In the above prior art, even if the exciting current value at the moment when the brake shoe starts to open is constant, the rising speed of the exciting current is caused by the fluctuation of the power supply voltage or the resistance change due to the temperature of the electromagnetic coil. Change, and as a result, the starting time also changes, and there is a possibility that the quality of the electromagnetic brake may be erroneously determined.
【０００５】本発明は上記の欠点に鑑みて、前記起動時
間をあらかじめ基準の環境状態に補正することにより、
電磁ブレーキの良否を正確に判定する電磁ブレーキの良
否判定装置を提供することにある。In view of the above-mentioned drawbacks, the present invention corrects the startup time in advance to a standard environmental condition,
An object of the present invention is to provide an electromagnetic brake quality determination device that accurately determines the quality of the electromagnetic brake.
【０００６】[0006]
【課題を解決するための手段】上記目的は、直流電源に
より電磁ブレーキの電磁コイルを励磁してから前記電磁
ブレーキのブレーキシューが動作するまでの起動時間を
励磁電流の落ちこみ時刻から演算する手段と前記起動時
間と基準時間との時間差が所定値を越えたとき前記電磁
ブレーキを異常と判定する手段を備えた電磁ブレーキの
良否判定装置において、前記直流電源の電源電圧を検知
し、この電圧と基準電圧との電圧差を演算する電圧差演
算手段と前記電磁コイルの温度を検知し、この温度と基
準温度との温度差を演算する温度差演算手段と前記電圧
差演算手段と前記温度差演算手段との出力から前記起動
時間を前記基準電圧および前記基準温度の環境状態に補
正する起動時間補正手段とを備えることにより達成され
る。The above object is to provide a means for calculating a starting time from the excitation of an electromagnetic coil of an electromagnetic brake by a DC power supply to the operation of a brake shoe of the electromagnetic brake, from a fall time of an exciting current. In a device for determining whether the electromagnetic brake is abnormal when the time difference between the starting time and the reference time exceeds a predetermined value, a device for determining the quality of the electromagnetic brake detects the power supply voltage of the DC power supply, and determines the voltage and the reference voltage. Voltage difference calculating means for calculating a voltage difference with a voltage and temperature of the electromagnetic coil, and temperature difference calculating means for calculating a temperature difference between this temperature and a reference temperature, the voltage difference calculating means, and the temperature difference calculating means And an activation time correction means for correcting the activation time to the environmental conditions of the reference voltage and the reference temperature.
【０００７】[0007]
【作用】本発明によれば、電磁コイルの電源電圧と電磁
コイルの温度を検知し、電源電圧と基準電圧との電圧差
と、電磁コイルの温度と基準温度との温度差を演算し、
この演算した出力により、電磁ブレーキの起動時間を基
準電圧および基準温度との環境状態に補正し、この補正
された起動時間を用いて、基準の起動時間と比較し、良
否を判定したので、電磁ブレーキの良否を正確に判定す
ることができる。According to the present invention, the power supply voltage of the electromagnetic coil and the temperature of the electromagnetic coil are detected, and the voltage difference between the power supply voltage and the reference voltage and the temperature difference between the temperature of the electromagnetic coil and the reference temperature are calculated.
With this calculated output, the startup time of the electromagnetic brake is corrected to the environmental conditions of the reference voltage and the reference temperature, and the corrected startup time is used to compare with the reference startup time to determine whether it is good or bad. The quality of the brake can be accurately determined.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図１〜図３を用い
て、説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【０００９】図１は本発明になる電磁ブレーキの良否判
定装置のブロック図を示したものである。図１におい
て、１はブレーキドラム、２はブレーキシューで、常
時、制動ばね３を介して、ブレーキシュー２はブレーキ
ドラム１を押圧し、制動状態を保っている。４は固定鉄
心、５は可動鉄心で、固定鉄心４と可動鉄心５は間隙ｇ
を隔てて配設されている。そして、スイッチ７を投入す
ると、直流電源８により、電磁コイル６は励磁され、可
動鉄心５は固定鉄心４に吸引され、ブレーキシユー２は
開き、ブレーキドラム１は釈放される。FIG. 1 is a block diagram of an electromagnetic brake quality determining apparatus according to the present invention. In FIG. 1, 1 is a brake drum, 2 is a brake shoe, and the brake shoe 2 constantly presses the brake drum 1 via a braking spring 3 to maintain a braking state. 4 is a fixed iron core, 5 is a movable iron core, and a gap g is provided between the fixed iron core 4 and the movable iron core 5.
Are separated from each other. When the switch 7 is turned on, the electromagnetic coil 6 is excited by the DC power supply 8, the movable iron core 5 is attracted to the fixed iron core 4, the brake shoe 2 is opened, and the brake drum 1 is released.
【００１０】図３は電磁コイル６に流れる励磁電流の波
形図を示したものである。図３において、曲線１１は直
流電源８の電源電圧ＥＸ、電磁コイル６の温度がＴＸの
場合で、励磁電流は動作指令後、指数関数的に上昇し、
励磁電流がＩＸに達すると、ブレーキシュー２が開き、
励磁電流はその反作用で、一瞬落ちこみ、ふたたび上昇
し、定常値に達する。そして、動作指令から励磁電流が
落ちこんだ時刻までが電磁ブレーキの起動時間ｔＸとな
る。曲線１２は電源電圧が基準電圧ＥＳたとえば１００
Ｖ、電磁コイル６の温度が基準温度ＴＸ、たとえば３０
℃の場合で、同様に、ブレーキシュー２が開く励磁電流
はＩＳ、そのときの動作時間はｔＳである。FIG. 3 is a waveform diagram of the exciting current flowing through the electromagnetic coil 6. In FIG. 3, a curve 11 represents the case where the power supply voltage EX of the DC power supply 8 and the temperature of the electromagnetic coil 6 are TX, and the exciting current rises exponentially after the operation command,
When the exciting current reaches IX, the brake shoe 2 opens,
The exciting current, as a reaction, falls for a moment, then rises again, and reaches a steady value. Then, the start time tX of the electromagnetic brake is from the operation command to the time when the exciting current drops. In the curve 12, the power supply voltage is the reference voltage ES, for example 100.
V, the temperature of the electromagnetic coil 6 is a reference temperature TX, for example, 30
Similarly, in the case of ° C, the exciting current for opening the brake shoe 2 is IS, and the operating time at that time is tS.
【００１１】励磁電流をｉ、時間をｔとすると、励磁電
流ｉは次式で与えられる。When the exciting current is i and the time is t, the exciting current i is given by the following equation.
【００１２】 ｉ＝Ｅ／Ｒ（１−ｅｘｐ（−Ｒ＊ｔ／Ｌ）） ・・・・・（１） ここに、Ｌ；電磁コイルのリアクタンス Ｒ；電磁コイルの抵抗 Ｅ；電源電圧 起動時間ｔＸは、（１）式において、ｔ＝ｔＸ、Ｅ＝Ｅ
Ｘとおくことにより、 ｔＸ＝−Ｌ／Ｒ＊１ｎ（１−Ｒ＊１Ｘ／ＥＸ） ・・・・・（２） となる。I = E / R (1−exp (−R * t / L)) (1) where, L is the reactance of the electromagnetic coil, R is the resistance of the electromagnetic coil, E is the power supply voltage, and the startup time is In the equation (1), tX is t = tX and E = E.
By setting X, tX = -L / R * 1n (1-R * 1X / EX) (2).
【００１３】したがって、励磁電流１Ｘが一定でも、電
圧ＥＸおよび抵抗Ｒが変化すると、動作時間ｔＸは変化
する。Therefore, even if the exciting current 1X is constant, if the voltage EX and the resistance R change, the operating time tX changes.
【００１４】今、基準電圧ＥＳ、基準温度ＴＳの環境状
態に起動時間ｔＸを補正すると、補正された起動時間ｔ
Ｙは近似的に ｔＹ＝（１＋Ａ（ＥＸ−ＥＳ）＊（１＋Ｂ（ＴＸ−ＴＳ））＊ｔＸ ・・・・・（３） となる。Now, when the startup time tX is corrected to the environmental conditions of the reference voltage ES and the reference temperature TS, the corrected startup time t
Y is approximately tY = (1 + A (EX-ES) * (1 + B (TX-TS)) * tX (3).
【００１５】ここに、（１＋Ａ（ＥＸ−ＥＳ））；基準
電圧ＥＳに対する補正項 （１＋Ｂ（ＴＸ−ＴＳ））；基準温度ＴＳに対する補正
項 Ａ；電源電圧の補正係数 Ｂ；温度の補正係数 そこで、この補正された起動時間ｔＹと基準時間ｔＳと
の差を演算し、この値が所定値ｔＤを越えると、すなわ
ち ｔＹ−ｔＳ＞ｔＤ ・・・・・（４） のとき、電磁ブレーキは異常と判定する。Here, (1 + A (EX-ES)); correction term for reference voltage ES (1 + B (TX-TS)); correction term for reference temperature TS A; correction coefficient for power supply voltage B; correction coefficient for temperature The difference between the corrected starting time tY and the reference time tS is calculated, and when this value exceeds a predetermined value tD, that is, when tY-tS> tD (4), the electromagnetic brake is abnormal. To determine.
【００１６】図１において、２０は電磁コイル６に流れ
る励磁電流ｉを検知するセンサ、２１は前記励磁電流ｉ
から起動時間ｔＸを演算する起動時間演算手段、３０は
電源電圧ＥＸを検知する電圧センサで、３１は電圧セン
サ３０を用いて、電圧差（ＥＸ−ＥＳ）を演算する電圧
差演算手段、３２は電磁コイル６の温度を検知する温度
センサで、温度センサ３２を用いて、温度差（ＴＸ−Ｔ
Ｓ）を演算する温度差演算手段である。４０は起動時間
演算手段２１、電圧差演算手段３１、温度差演算手段３
３の出力を入力し、起動時間ｔＸを補正された起動時間
ｔＹに補正演算する起動時間補正手段で、４１は補正さ
れた起動時間ｔＹと基準時間ｔＳとの差から電磁ブレー
キの良否を判定する判定手段、４２は判定手段４１の結
果を報知する報知手段である。In FIG. 1, 20 is a sensor for detecting the exciting current i flowing in the electromagnetic coil 6, and 21 is the exciting current i.
Starting-up time calculating means for calculating starting time tX, 30 is a voltage sensor for detecting the power supply voltage EX, 31 is voltage difference calculating means for calculating a voltage difference (EX-ES) using the voltage sensor 30, and 32 is A temperature sensor that detects the temperature of the electromagnetic coil 6 is used to detect a temperature difference (TX-T
It is a temperature difference calculation means for calculating S). Reference numeral 40 is a startup time calculating means 21, a voltage difference calculating means 31, a temperature difference calculating means 3
The start time correction means 41 inputs the output of No. 3 and corrects the start time tX to the corrected start time tY, and 41 determines the quality of the electromagnetic brake from the difference between the corrected start time tY and the reference time tS. Determining means, 42 is an informing means for informing the result of the determining means 41.
【００１７】次に、本実施例の動作を図２に示したフロ
ーチャートを用いて、説明する。Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.
【００１８】ステップＳ１において、基準電圧ＥＳ、基
準温度ＴＳ、基準時間ｔＳ、所定値ｔＤを入力し、ステ
ップＳ２において、スイッチ７を投入し、電磁ブレーキ
に励磁電流ｉを流し、ステップＳ３において、励磁電流
ｉ、電源電圧ＥＸ、電磁コイル６の温度ＴＸを取り込
み、ステップＳ４において、起動時間ｔＸ、電圧差（Ｅ
Ｘ−ＥＳ）、温度差（ＴＸ−ＴＳ）を演算し、ステップ
Ｓ５において、これらの演算出力値を入力し、（３）式
から補正された起動時間ｔＹを演算し、ステップＳ６に
おいて、起動時間差（ｔＹ−ｔＸ）が所定値ｔＤを越え
ると、ステップＳ７に飛び、電磁ブレーキは異常と判定
し、ステップＳ８において、異常であることを報知し、
所定値ｔＤ以下の場合にはステップＳ９に飛び、正常と
判定する。In step S1, the reference voltage ES, the reference temperature TS, the reference time tS, and the predetermined value tD are input. In step S2, the switch 7 is turned on to apply the exciting current i to the electromagnetic brake, and in step S3, the exciting current i is excited. The current i, the power supply voltage EX, and the temperature TX of the electromagnetic coil 6 are fetched, and in step S4, the starting time tX and the voltage difference (E
X-ES) and the temperature difference (TX-TS) are calculated, these calculated output values are input in step S5, and the startup time tY corrected from equation (3) is calculated, and the startup time difference is calculated in step S6. When (tY-tX) exceeds the predetermined value tD, the process jumps to step S7, it is determined that the electromagnetic brake is abnormal, and in step S8, the abnormality is notified,
When the value is equal to or smaller than the predetermined value tD, the process jumps to step S9 and is determined to be normal.
【００１９】このように、電磁ブレーキの起動時間ＴＸ
を基準の環境状態に補正したので、正確に電磁ブレーキ
の良否を判定することができる。In this way, the electromagnetic brake activation time TX
Is corrected to the reference environmental condition, the quality of the electromagnetic brake can be accurately determined.
【００２０】[0020]
【発明の効果】以上、述べたように、本発明によれば、
電磁ブレーキが稼動中の電源電圧および電磁コイルの温
度を測定し、電磁ブレーキの起動時間を前記電源電圧お
よび前記温度から基準電圧、基準温度の環境状態に補正
し、この補正された起動時間を用いて、電磁ブレーキの
良否を判定したので正確に異常状態を検出することがで
きる効果がある。As described above, according to the present invention,
The power supply voltage while the electromagnetic brake is operating and the temperature of the electromagnetic coil are measured, the startup time of the electromagnetic brake is corrected from the power supply voltage and the temperature to the reference voltage and the reference temperature environmental conditions, and the corrected startup time is used. Since the quality of the electromagnetic brake is determined, it is possible to accurately detect the abnormal state.
【図１】本発明になる電磁ブレーキの良否判定装置のブ
ロック図である。FIG. 1 is a block diagram of an electromagnetic brake quality determination device according to the present invention.
【図２】本発明の動作を説明するフローチャートであ
る。FIG. 2 is a flowchart explaining the operation of the present invention.
【図３】電磁コイルに流れる励磁電流の波形図である。FIG. 3 is a waveform diagram of an exciting current flowing in an electromagnetic coil.
２ ブレーキシュー ６ 電磁コイル ８ 直流電源 ２０ 電流センサ ３０ 電圧センサ ３１ 電圧差演算手段 ３２ 温度センサ ３３ 温度差演算手段 ４０ 起動時間補正手段 ４１ 判定手段 ＥＳ 基準電圧 ＥＸ 電源電圧 ＴＳ 基準温度 ＴＸ 電磁コイルの温度 ｔＤ 所定値 ｔＳ 基準時間 ｔＸ 起動時間 ｔＹ 補正された起動時間 2 brake shoes 6 electromagnetic coil 8 DC power supply 20 current sensor 30 voltage sensor 31 voltage difference calculation means 32 temperature sensor 33 temperature difference calculation means 40 startup time correction means 41 determination means ES reference voltage EX power supply voltage TS reference temperature TX electromagnetic coil temperature tD predetermined value tS reference time tX startup time tY corrected startup time
Claims (1)
ルを励磁してから前記電磁ブレーキのブレーキシューが
動作するまでの起動時間を励磁電流の落ちこみ時刻から
演算する手段と前記起動時間と基準時間との時間差が所
定値を越えたとき前記電磁ブレーキを異常と判定する手
段を備えた電磁ブレーキの良否判定装置において、前記
直流電源の電源電圧を検知し、この電圧と基準電圧との
電圧差を演算する電圧差演算手段と前記電磁コイルの温
度を検知し、この温度と基準温度との温度差を演算する
温度差演算手段と前記電圧差演算手段と前記温度差演算
手段との出力から前記起動時間を前記基準電圧および前
記基準温度の環境状態に補正する起動時間補正手段とを
備えたことを特徴とする電磁ブレーキの良否判定装置。1. A means for calculating a starting time from the excitation of an electromagnetic coil of an electromagnetic brake by a direct current power source to the operation of a brake shoe of the electromagnetic brake from a fall time of an exciting current, the starting time and a reference time. An electromagnetic brake quality determination device having means for determining that the electromagnetic brake is abnormal when the time difference exceeds a predetermined value, detects the power supply voltage of the DC power supply, and calculates the voltage difference between this voltage and the reference voltage. The starting time is calculated from the outputs of the temperature difference calculation means, the voltage difference calculation means, which detects the temperature of the voltage difference calculation means and the electromagnetic coil, and calculates the temperature difference between this temperature and the reference temperature. An apparatus for determining the quality of an electromagnetic brake, comprising startup time correction means for correcting the environmental conditions of the reference voltage and the reference temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18146194A JPH0842613A (en) | 1994-08-02 | 1994-08-02 | Electromagnetic brake quality determination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18146194A JPH0842613A (en) | 1994-08-02 | 1994-08-02 | Electromagnetic brake quality determination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0842613A true JPH0842613A (en) | 1996-02-16 |
Family
ID=16101168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18146194A Pending JPH0842613A (en) | 1994-08-02 | 1994-08-02 | Electromagnetic brake quality determination device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0842613A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2384279A (en) * | 2001-12-11 | 2003-07-23 | Hitachi Building Sys Co Ltd | Elevator magnetic brake trouble detection system |
| JP2013018386A (en) * | 2011-07-12 | 2013-01-31 | Kanzaki Kokyukoki Manufacturing Co Ltd | Working vehicle with electromagnetic brake |
| WO2013088823A1 (en) * | 2011-12-12 | 2013-06-20 | 三菱電機株式会社 | Electromagnetic brake condition diagnosis device and method therefor |
| WO2013124538A1 (en) * | 2012-02-20 | 2013-08-29 | Konecranes Plc | Monitoring of brake |
| WO2018054545A1 (en) * | 2016-09-22 | 2018-03-29 | Sew-Eurodrive Gmbh & Co. Kg | Method for monitoring an electromagnetically actuatable brake, and vehicle with electromagnetically actuatable brake |
| CN110207728A (en) * | 2018-02-28 | 2019-09-06 | 北京金风科创风电设备有限公司 | Brake pad wear detection method and device and wind generating set yaw system |
| CN112431876A (en) * | 2019-08-26 | 2021-03-02 | 上海汽车集团股份有限公司 | Temperature estimation method and device for dry clutch |
| US20250381637A1 (en) * | 2022-07-05 | 2025-12-18 | Weiss Gmbh | Method for operating a pivot drive and pivot drive |
-
1994
- 1994-08-02 JP JP18146194A patent/JPH0842613A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2384279A (en) * | 2001-12-11 | 2003-07-23 | Hitachi Building Sys Co Ltd | Elevator magnetic brake trouble detection system |
| GB2384279B (en) * | 2001-12-11 | 2005-06-08 | Hitachi Building Sys Co Ltd | Magnetic brake system and elevator trouble detection system |
| CN1315716C (en) * | 2001-12-11 | 2007-05-16 | 株式会社日立建筑系统 | Electromagnetic braking device and apparatus for detecting abnormal of lift |
| JP2013018386A (en) * | 2011-07-12 | 2013-01-31 | Kanzaki Kokyukoki Manufacturing Co Ltd | Working vehicle with electromagnetic brake |
| WO2013088823A1 (en) * | 2011-12-12 | 2013-06-20 | 三菱電機株式会社 | Electromagnetic brake condition diagnosis device and method therefor |
| WO2013124538A1 (en) * | 2012-02-20 | 2013-08-29 | Konecranes Plc | Monitoring of brake |
| CN104246280A (en) * | 2012-02-20 | 2014-12-24 | 科恩起重机有限公司 | Monitoring of the brakes |
| US9233818B2 (en) | 2012-02-20 | 2016-01-12 | Konecranes Plc | Monitoring of brake |
| WO2018054545A1 (en) * | 2016-09-22 | 2018-03-29 | Sew-Eurodrive Gmbh & Co. Kg | Method for monitoring an electromagnetically actuatable brake, and vehicle with electromagnetically actuatable brake |
| CN109641585A (en) * | 2016-09-22 | 2019-04-16 | 索尤若驱动有限及两合公司 | Method for monitoring electromagnetically operable brakes and vehicle with electromagnetically operable brakes |
| CN109641585B (en) * | 2016-09-22 | 2021-08-27 | 索尤若驱动有限及两合公司 | Method for monitoring an electromagnetically actuable brake and vehicle having an electromagnetically actuable brake |
| US11535226B2 (en) | 2016-09-22 | 2022-12-27 | Sew-Eurodrive Gmbh & Co. Kg | Method for monitoring an electromagnetically actuable brake, and vehicle having an electromagnetically actuable brake |
| CN110207728A (en) * | 2018-02-28 | 2019-09-06 | 北京金风科创风电设备有限公司 | Brake pad wear detection method and device and wind generating set yaw system |
| CN112431876A (en) * | 2019-08-26 | 2021-03-02 | 上海汽车集团股份有限公司 | Temperature estimation method and device for dry clutch |
| CN112431876B (en) * | 2019-08-26 | 2022-05-27 | 上海汽车集团股份有限公司 | Method and device for temperature estimation of dry clutch |
| US20250381637A1 (en) * | 2022-07-05 | 2025-12-18 | Weiss Gmbh | Method for operating a pivot drive and pivot drive |
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