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JP4211082B2 - Drive control method and apparatus for vibration feeder - Google Patents
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JP4211082B2 - Drive control method and apparatus for vibration feeder - Google Patents

Drive control method and apparatus for vibration feeder Download PDF

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JP4211082B2
JP4211082B2 JP09393898A JP9393898A JP4211082B2 JP 4211082 B2 JP4211082 B2 JP 4211082B2 JP 09393898 A JP09393898 A JP 09393898A JP 9393898 A JP9393898 A JP 9393898A JP 4211082 B2 JP4211082 B2 JP 4211082B2
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frequency
vibration
drive control
driving
vibration feeder
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JPH11180530A (en
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裕彦 村田
昌伸 冨田
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神鋼電機株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は振動フィーダの駆動制御方法及びその装置に関する。
【0002】
【従来の技術】
電磁振動フィーダ、例えば振動パーツフィーダはボウルとベースとを板ばねで結合し、上記可動部には接極子が固定されているが、これに空隙をおいてベースに電磁石を取り付けている。この電磁石のコイルに印加される電圧と上記ボウルの振動変位との位相差を検出して、この位相差を180度となるように上記コイルに印加される電圧の周波数を増減させて共振振動させるようにしている。いわゆる共振追尾制御と称せされるものであるが、この振動パーツフィーダは駆動開始ごとに上述の共振追尾制御を行っているので、駆動開始時の周波数は共振点から大きく離れているので、強制振動であり、最初は、振巾は小さい。共振追尾制御により、この駆動周波数が上昇していくのであるが、共振点近傍においてはボウルの振巾が急激に大きくなるので、ボウル、特にそのトラック内の部品にショックが加わり、振動開始後直ちに整列作用が行われず、このショックによってトラックからボウルの底壁内へと殆どの部品が落下してしまうことがある。これでは再び整列手段があるトラック部分まで上昇してくるのにかなりの時間を有する。あるいはワイパーなどの整列手段では、ここで詰まりが生ずることがある。また、強制振動時にはコイルに大きな電流を流さねばならないので、共振振動時の電流の容量では足りず、相当大きな電気容量を有する電源でなければならない。
【0003】
【発明が解決しようとする課題】
本発明は上述の問題点に鑑みてなされ、電気容量を小とし、また駆動開始時のショックをなくす振動フィーダの駆動制御方法及びその装置を提供とすることを課題とする。
【0004】
【課題を解決するための手段】
以上の課題は、可動部と基台とをばねで結合し、前記可動部か前記基台に電磁石を取付け、該電磁石のコイルに印加される電圧と前記可動部の振動変位との位相の進み又は遅れを検出して、位相差が180度となるように前記コイルに印加される前記電圧の周波数を増減させて共振振動させるようにした振動フィーダの駆動制御方法において、前記位相の進み又は遅れの検出は、前記電圧の負から正へ又は正から負へのゼロクロスポイントにおいて前記振動変位が正か負かによって行い、前記周波数の増減を制御する共振点追尾手段を有し、前回の駆動時の前記周波数を記憶し、再駆動時には該記憶した前記周波数で駆動開始させるようにしたことを特徴とする振動フィーダの駆動制御方法、によって解決される。
【0005】
又は、ばねで振動可能に支持された可動体と、加振源とを備えた振動フィーダを、前記加振源の加振力と前記可動体の振動変位との位相の進み又は遅れを検出して、前記加振源の加振周波数を増減させて、共振振動させるようにした振動フィーダの駆動制御方法において、前記加振周波数の増減を制御する共振点追尾手段を有し、前記共振振動時の前記加振周波数を記憶し、再駆動時には該記憶した前記周波数で駆動開始させるようにしたことを特徴とする振動フィーダの駆動制御方法、によって解決される。
【0006】
又は、可動部と基台とをばねで結合し、前記可動部か前記基台に電磁石を取付け、該電磁石のコイルに印加される電圧と前記可動部の振動変位との位相の進み又は遅れを位相差検出器により検出して、位相差が180度となるように前記コイルに印加されるべき可変周波数電源の電圧の周波数を増減させて共振振動させるようにした振動フィーダの駆動制御装置において、前記位相の進み又は遅れの検出は、前記電圧の負から正へ又は正から負へのゼロクロスポイントにおいて前記振動変位が正か負かによって行い、前記周波数を制御する共振点追尾回路を有し、前回の駆動時の前記可変周波数電源の前記周波数を内蔵するメモリに記憶し、再駆動時には該記憶した前記周波数で駆動開始させるようにしたことを特徴とする振動フィーダの駆動制御装置によって解決される。
【0007】
上記構成によってその振動フィーダのその時の共振振動数にほゞ近い共振振動数で駆動開始させることができるので、共振点振動までに要する時間はほゞ零であり、よって強制振動から共振振動に移るときのショックをなくし、また電流を最初から多く流す必要がなく、電気容量を小とすることができる。また長期にわたる使用においては、装置自体に経時変化があるが、これに対しても常に共振状態で運転することが出来る。
【0008】
【発明の実施の形態】
以下、本発明の実施の形態において、図面を参照して説明する。
【0009】
本発明の実施の形態では、電磁振動パーツフィーダとして、振動パーツフィーダが適用され、図1においてボウル1内にはその内周壁部にスパイラル状にトラックが形成されており、これは下方のベース2と等角度間隔で配設された傾斜板ばね5により、結合されている。ベース2には電磁石3が固定されており、これには電磁コイル4が巻装されている。振動パーツフィーダ全体は防振ゴム6により、床上に設置されている。
【0010】
板ばね5に近接して振動ピックアップPが配設されている。このピックアップPは図示しない支柱により床上を支持されている。これは本発明に係る共振点追尾制御回路7に電線路W1 を介して接続されている。更に共振点追尾制御回路7から電磁石3の電磁コイル4に出力が加えられている。
【0011】
図2は図1における共振点追尾制御回路7の詳細を示すものであるが、主として可変周波数電源10、位相検出回路11およびメモリ15からなっている。可変周波数電源10には図2にも示されるように交流電源8にスイッチSを介して接続されており、この出力は増巾器12を介して電磁石3の電磁コイル4に接続されている。また図1におけるピックアップPの出力は電線路W1 を介して増巾器13に接続される。この増巾出力は位相検出回路11に供給される。この位相検出回路11には、更に可変周波数電源10の出力を増巾器12に供給し、その増巾出力が電線路W3 を介して供給されており、この位相検出出力が可変周波数電源10に接続されている。これは例えばインバータであってよい。
【0012】
また本発明の実施の形態による位相検出回路11は図4に示されるような方法で検出を行う。これは以下の作用において詳細を説明する。
【0013】
更に本発明の実施の形態によれば、可変周波数電源10は不揮発性のメモリ15に接続されている。
【0014】
以上、本発明の実施の形態の構成について説明したが、次にこの作用について説明する。
【0015】
スイッチSを閉じると交流電源8が可変周波数電源10に接続され、駆動状態となる。この出力電圧は増巾器12を介して電磁石3の電磁コイル4に供給される。これにより、振動パーツフィーダのボウル1は捩り振動を行う。ピックアップPはこの振動変位を検出し、増巾器13により増巾されて、位相検出回路11に加えられる。他方、これにはこの時の電磁コイル4に印加されている電圧が供給されている。
【0016】
図4Aにはこの印加電圧Vの時間的変化を示すものであるが、この電磁コイル4により、一時遅れが生じ、これに流れる電流Iは図4Bに示すように変化する。この電流により、電磁石3とボウル1との間に交番磁気吸引力が発生し、ボウル1は捩り振動を行うのであるが、この振動変位が図4Cに示すように、コイル4にかかる電圧Vと90度遅れている場合にはすなわちコイル電圧Vが正から負に変わるゼロクロスポイントにおいて振動変位S1 が正であれば図3に示すように、共振点ω0 (角周波数)では位相差φは90度であるので、ω0 よりは小さく周波数を上昇させるべきであると位相検出回路11で判断して可変周波数電源10の出力周波数を上昇させる。これが増巾器12で増巾されて電磁石3のコイル4に流され、より周波数の高い電流でボウル1を振動させる。共振点ω0 に前回より近づいたことにより、振巾は上昇する。可変周波数電源10の出力周波数が更に高くなってついにω0 を越えて、これより高くなると図4A、Dに示すように振動変位S2 とコイル電圧Vとの関係は位相差で270度となる。
【0017】
図3の角周波数と位相差の関係から明らかなように共振点ω0 を通過したので可変周波数電源10の出力周波数を減少させる。なお、図3において、C1 、C2 、C3 は振動系の粘性係数を表わし、C3 >C2 >C1 である。
【0018】
以上のようにして可変周波数電源10の出力周波数の増減を行ってついにはこの振動パーツフィーダは共振周波数で駆動するようになる。振動パーツフィーダのボウル1内の図示しないスパイラルトラックでは部品が所定の姿勢になるように部品整列手段により整列される。この姿勢で次工程に供給される。
【0019】
振動パーツフィーダの駆動を停止させるべくスイッチSを開くと可変周波数電源10からの出力はなくなり、ボウル1の駆動は停止する。不揮発性のメモリ15にはスイッチSを切る前の可変周波数電源10の出力周波数が記憶されている。すなわち、駆動中あるいは駆動中の一定時間毎に、可変周波数電源10の出力周波数がメモリ15に記憶される。
【0020】
振動パーツフィーダを再び駆動開始させるべく、スイッチSを閉じるとメモリ15でこの時記憶されている共振周波数を出力すべく可変周波数電源10が駆動される。従って振動パーツフィーダのボウル1は最初から共振周波数で駆動される。従って従来のように強制振動から共振周波数に移るときのショックがなくなり、また電源容量を小とすることができる。
【0021】
以下、駆動停止、駆動開始を繰り返すごとに、メモリ15の内容が書き換えられているのであるが、1か月単位、1年単位では振動パーツフィーダの共振周波数が変動する。したがって従来のように共振周波数をその追尾制御して得ていたのでは上記のように強制振動から共振振動に移るために多くの電流を流さねばならないのであるが、年単位では強制振動に移る程、共振周波数の変動が大きくとも前回の共振周波数で駆動を開始することができるので、常に振動パーツフィーダをショックなく電源容量を小として駆動することができる。
【0022】
以上、本発明の実施の形態について説明したが、勿論、本発明はこれらに限定されることなく、本発明の技術的思想に基づいて種々の変形が可能である。
【0023】
例えば以上の実施例では直線的な捩り振動パーツフィーダについて説明したが、従来公知のように径方向で対向する一対の電磁石により、ボウル1を水平方向に捩り振動させる加振力を垂直方向の加振力(実施の形態のような)に対して所定の位相差を持って加えた時にはボウル1は楕円振動を行う。このような楕円振動パーツフィーダに対しても例えば垂直方向加振用の電磁石3のコイル4には本実施の形態のように共振追尾制御による前回の駆動時の周波数を加えてもよい。この場合には水平方向の電磁石には、可変周波数電源10の出力を加える。
【0024】
また、以上の実施の形態では可変周波数電源を自動的にその周波数を調整させるようにしたが、これに代えて、例えば電圧が一定で周波数掃引してボウルの振動変位を測定しながら最大になる周波数を測定し、すなわち、周波数掃引法により共振周波数を決定しこれをメモリに記憶させるようにしてもよい。
【0025】
また、以上の実施例では加振源が電磁石であるので、電圧と振動変位との位相差が180度になるように周波数を増減させて共振状態を得るようにしたが、コイルに流す電流と比べる場合には、当然のことながら電流と振動変位との位相差が90度となるように周波数は増減される。
【0026】
更に以上の実施の形態では、加振源は電磁石であったが、これに代えて板ばねに貼着した圧電素子に交流電圧を加えることにより、可動体を振動させる駆動制御方法においては共振状態では圧電素子に加える電圧が加振力と位相が同一であるので、振動変位との位相差が90度となるように圧電素子に加える交流電圧の周波数を増減させる。
【0027】
更に以上のようにして共振振動で振動させることができるのであるが、これらに更に加振源の加振周波数を可動部の実際の振動周波数と一致させるようにPLL(Phase Locked Loop)回路を加えてPLL制御を行うようにしてもよい。
【0028】
【発明の効果】
以上述べたように本発明の振動フィーダの駆動制御方法及びその装置によれば従来のように共振追尾制御を行うにしても駆動開始時には常に共振振動で開始させるので従来より電源容量を小とし、また駆動開始時のショックをなくすことができる。
【図面の簡単な説明】
【図1】図1は本発明実施の形態による振動パーツフィーダおよびこの駆動制御回路のブロック図を示す。
【図2】図1における共振追尾制御回路の詳細を表すブロック図である。
【図3】作用を説明するための角周波数と位相差(力と変位)との関係を示すチャートである。
【図4】位相検出回路の作用を説明するためのチャートであって、Aはコイル電圧の時間的変化、Bはコイル電流の時間的変化、Cは共振周波数より低い周波数で駆動される場合の振動変位の時間的変化、Dは共振周波数より高い周波数で駆動される場合の振動変位の時間的チャートである。
【符号の説明】
1 ボウル
3 電磁石
4 コイル
7 共振点追尾制御回路
10 可変周波数電源
11 位相検出回路
15 メモリ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive control method and apparatus for a vibration feeder.
[0002]
[Prior art]
In an electromagnetic vibration feeder, for example, a vibration part feeder, a bowl and a base are coupled by a leaf spring, and an armature is fixed to the movable portion, and an electromagnet is attached to the base with a gap therebetween. The phase difference between the voltage applied to the coil of the electromagnet and the vibration displacement of the bowl is detected, and the frequency of the voltage applied to the coil is increased / decreased so that the phase difference becomes 180 degrees to cause resonance vibration. I am doing so. This vibration parts feeder performs the above-described resonance tracking control every time driving is started, so the frequency at the start of driving is far away from the resonance point. At first, the amplitude is small. This drive frequency increases due to resonance tracking control, but the amplitude of the bowl suddenly increases in the vicinity of the resonance point, so a shock is applied to the bowl, particularly the components in the track, and immediately after the vibration starts. The alignment action is not performed, and this shock can cause most parts to fall from the track into the bottom wall of the bowl. This again takes a considerable amount of time to ascend to the track section where the alignment means is. Or, in an alignment means such as a wiper, clogging may occur here. In addition, since a large current must be passed through the coil during forced vibration, the current capacity during resonance vibration is not sufficient, and the power supply must have a considerably large electric capacity.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a drive control method and apparatus for a vibration feeder that has a small electric capacity and eliminates a shock at the start of driving.
[0004]
[Means for Solving the Problems]
The above problem is that the movable part and the base are coupled by a spring, an electromagnet is attached to the movable part or the base, and the phase advance between the voltage applied to the coil of the electromagnet and the vibration displacement of the movable part is achieved. or lag by detecting, in the drive control method of the vibrating feeder which is adapted the cause coil increases or decreases the frequency of the voltage applied to resonant vibrations so that the phase difference is 180 degrees, the flow advances of the phase or delay Is detected by whether the vibration displacement is positive or negative at the zero cross point from negative to positive or positive to negative of the voltage, and has a resonance point tracking means for controlling increase and decrease of the frequency, at the time of the previous driving storing said frequency, at the time of re-driving is solved drive control method of a vibration feeder, characterized in that so as to start driving by the frequency that the storage, by.
[0005]
Alternatively, a vibration feeder including a movable body supported by a spring so as to vibrate and an excitation source is used to detect a phase advance or delay between the excitation force of the excitation source and the vibration displacement of the movable body. In the drive control method of the vibration feeder that causes resonance vibration by increasing / decreasing the excitation frequency of the excitation source, the resonance feeder has a resonance point tracking unit that controls increase / decrease of the excitation frequency, It said storing vibration frequency, at the time of re-driving is solved drive control method of a vibration feeder, characterized in that so as to start driving by the frequency that the storage, by.
[0006]
Alternatively, the movable part and the base are coupled by a spring, an electromagnet is attached to the movable part or the base, and the phase advance or delay between the voltage applied to the coil of the electromagnet and the vibration displacement of the movable part is adjusted. In the drive control device of the vibration feeder that is detected by the phase difference detector and is caused to resonate and vibrate by increasing or decreasing the frequency of the voltage of the variable frequency power supply to be applied to the coil so that the phase difference is 180 degrees. The detection of the phase advance or delay has a resonance point tracking circuit that controls the frequency by performing the vibration displacement positively or negatively at a zero crossing point of the voltage from negative to positive or from positive to negative . The drive of the vibration feeder, wherein the frequency of the variable frequency power source at the previous drive is stored in a built-in memory, and the drive is started at the stored frequency at the time of re-drive. It is solved by a control device.
[0007]
With the above configuration, the vibration feeder can be started to drive at a resonance frequency that is close to the resonance frequency at that time, so that the time required to resonate at the resonance point is almost zero. The electric shock can be reduced by eliminating the shock at the time and eliminating the need to flow a large amount of current from the beginning. In addition, during long-term use, the device itself changes with time, but it can always be operated in a resonance state.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
In the embodiment of the present invention, a vibrating parts feeder is applied as an electromagnetic vibrating parts feeder, and in FIG. 1, a track is formed in a spiral shape on the inner peripheral wall portion in the bowl 1. Are coupled by inclined leaf springs 5 arranged at equal angular intervals. An electromagnet 3 is fixed to the base 2, and an electromagnetic coil 4 is wound around the electromagnet 3. The whole vibration parts feeder is installed on the floor by vibration-proof rubber 6.
[0010]
A vibration pickup P is disposed in the vicinity of the leaf spring 5. The pickup P is supported on the floor by a support (not shown). This is connected to the resonance point tracking control circuit 7 according to the present invention via the electric line W 1 . Further, an output is applied from the resonance point tracking control circuit 7 to the electromagnetic coil 4 of the electromagnet 3.
[0011]
FIG. 2 shows details of the resonance point tracking control circuit 7 in FIG. 1, which mainly comprises a variable frequency power supply 10, a phase detection circuit 11 and a memory 15. As shown in FIG. 2, the variable frequency power supply 10 is connected to an AC power supply 8 via a switch S, and this output is connected to the electromagnetic coil 4 of the electromagnet 3 via an amplifier 12. Further, the output of the pickup P in FIG. 1 is connected to the amplifier 13 through the electric line W 1 . This amplified output is supplied to the phase detection circuit 11. The phase detection circuit 11 is further supplied with the output of the variable frequency power source 10 to the amplifier 12 and the amplified output is supplied via the electric line W 3. The phase detection output is supplied to the variable frequency power source 10. It is connected to the. This may be an inverter, for example.
[0012]
Further, the phase detection circuit 11 according to the embodiment of the present invention performs detection by a method as shown in FIG. This will be explained in detail in the following operation.
[0013]
Furthermore, according to the embodiment of the present invention, the variable frequency power supply 10 is connected to the nonvolatile memory 15.
[0014]
The configuration of the embodiment of the present invention has been described above. Next, this operation will be described.
[0015]
When the switch S is closed, the AC power source 8 is connected to the variable frequency power source 10 and is in a driving state. This output voltage is supplied to the electromagnetic coil 4 of the electromagnet 3 via the amplifier 12. Thereby, the bowl 1 of the vibration part feeder performs torsional vibration. The pickup P detects this vibration displacement, is amplified by the amplifier 13, and is applied to the phase detection circuit 11. On the other hand, the voltage applied to the electromagnetic coil 4 at this time is supplied to this.
[0016]
FIG. 4A shows the change over time of the applied voltage V. Due to this electromagnetic coil 4, a temporary delay occurs, and the current I flowing therethrough changes as shown in FIG. 4B. This current generates an alternating magnetic attractive force between the electromagnet 3 and the bowl 1, and the bowl 1 undergoes torsional vibration. This vibration displacement, as shown in FIG. If the vibration displacement S 1 is positive at the zero cross point where the coil voltage V changes from positive to negative when it is delayed by 90 degrees, the phase difference φ at the resonance point ω 0 (angular frequency) is as shown in FIG. Since it is 90 degrees, the phase detection circuit 11 determines that the frequency should be increased smaller than ω 0 , and the output frequency of the variable frequency power supply 10 is increased. This is amplified by the amplifier 12 and passed through the coil 4 of the electromagnet 3 to vibrate the bowl 1 with a higher frequency current. By approaching the resonance point ω 0 from the previous time, the amplitude increases. When the output frequency of the variable frequency power supply 10 further increases and finally exceeds ω 0 and becomes higher than this, the relationship between the vibration displacement S 2 and the coil voltage V becomes 270 degrees in phase difference as shown in FIGS. 4A and 4D. .
[0017]
As apparent from the relationship between the angular frequency and the phase difference in FIG. 3, since the resonance point ω 0 is passed, the output frequency of the variable frequency power supply 10 is decreased. In FIG. 3, C 1 , C 2 , and C 3 represent the viscosity coefficients of the vibration system, and C 3 > C 2 > C 1 .
[0018]
As described above, when the output frequency of the variable frequency power supply 10 is increased or decreased, this vibration part feeder is driven at the resonance frequency. In the spiral track (not shown) in the bowl 1 of the vibration part feeder, the parts are aligned by the parts aligning means so as to have a predetermined posture. This posture is supplied to the next process.
[0019]
When the switch S is opened to stop the driving of the vibrating parts feeder, the output from the variable frequency power supply 10 is lost and the driving of the bowl 1 is stopped. The non-volatile memory 15 stores the output frequency of the variable frequency power supply 10 before the switch S is turned off. In other words, the output frequency of the variable frequency power supply 10 is stored in the memory 15 during driving or every fixed time during driving.
[0020]
When the switch S is closed to start driving the vibration parts feeder again, the variable frequency power source 10 is driven to output the resonance frequency stored in the memory 15 at this time. Accordingly, the bowl 1 of the vibrating parts feeder is driven at the resonance frequency from the beginning. Therefore, there is no shock when shifting from the forced vibration to the resonance frequency as in the prior art, and the power source capacity can be reduced.
[0021]
Hereinafter, the contents of the memory 15 are rewritten every time the driving stop and the driving start are repeated, but the resonance frequency of the vibration parts feeder varies in units of one month and one year. Therefore, if the resonance frequency was obtained by tracking control as in the past, a large amount of current must be passed to move from forced vibration to resonant vibration as described above. Since the drive can be started at the previous resonance frequency even if the fluctuation of the resonance frequency is large, the vibration parts feeder can always be driven with a small power supply capacity without a shock.
[0022]
As mentioned above, although embodiment of this invention was described, of course, this invention is not limited to these, A various deformation | transformation is possible based on the technical idea of this invention.
[0023]
For example, in the above embodiment, the linear torsional vibration part feeder has been described. However, as conventionally known, a pair of electromagnets facing each other in the radial direction is used to apply an exciting force for torsionally vibrating the bowl 1 in the horizontal direction in the vertical direction. When the vibration force (as in the embodiment) is applied with a predetermined phase difference, the bowl 1 performs elliptical vibration. Also for such an elliptical vibration parts feeder, for example, the frequency of the previous drive by resonance tracking control may be added to the coil 4 of the electromagnet 3 for vertical direction vibration as in this embodiment. In this case, the output of the variable frequency power supply 10 is applied to the horizontal electromagnet.
[0024]
In the above embodiments, the frequency of the variable frequency power supply is automatically adjusted. However, instead, for example, the voltage is constant and the frequency is swept to measure the vibration displacement of the bowl and maximize. The frequency may be measured, that is, the resonance frequency may be determined by the frequency sweep method and stored in the memory.
[0025]
In the above embodiment, since the excitation source is an electromagnet, the resonance state is obtained by increasing or decreasing the frequency so that the phase difference between the voltage and the vibration displacement is 180 degrees. In comparison, of course, the frequency is increased or decreased so that the phase difference between the current and the vibration displacement is 90 degrees.
[0026]
Further, in the above embodiment, the excitation source is an electromagnet, but instead of this, in the drive control method for vibrating the movable body by applying an AC voltage to the piezoelectric element attached to the leaf spring, a resonance state is obtained. Since the voltage applied to the piezoelectric element has the same phase as the excitation force, the frequency of the alternating voltage applied to the piezoelectric element is increased or decreased so that the phase difference from the vibration displacement is 90 degrees.
[0027]
Further, it is possible to vibrate by resonance vibration as described above, but a PLL (Phase Locked Loop) circuit is added to these so that the excitation frequency of the excitation source matches the actual vibration frequency of the movable part. PLL control may be performed.
[0028]
【The invention's effect】
As described above, according to the drive control method and apparatus of the vibration feeder of the present invention, even if the resonance tracking control is performed as in the prior art, at the start of the drive, the vibration is always started at the resonance vibration, so the power capacity is made smaller than before, In addition, the shock at the start of driving can be eliminated.
[Brief description of the drawings]
FIG. 1 is a block diagram of a vibration parts feeder and a drive control circuit according to an embodiment of the present invention.
FIG. 2 is a block diagram showing details of a resonance tracking control circuit in FIG.
FIG. 3 is a chart showing the relationship between angular frequency and phase difference (force and displacement) for explaining the operation.
FIG. 4 is a chart for explaining the operation of the phase detection circuit, where A is a temporal change in coil voltage, B is a temporal change in coil current, and C is driven at a frequency lower than the resonance frequency. A temporal change of the vibration displacement, D is a time chart of the vibration displacement when driven at a frequency higher than the resonance frequency.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bowl 3 Electromagnet 4 Coil 7 Resonance point tracking control circuit 10 Variable frequency power supply 11 Phase detection circuit 15 Memory

Claims (4)

可動部と基台とをばねで結合し、前記可動部か前記基台に電磁石を取付け、該電磁石のコイルに印加される電圧と前記可動部の振動変位との位相の進み又は遅れを検出して、位相差が180度となるように前記コイルに印加される前記電圧の周波数を増減させて共振振動させるようにした振動フィーダの駆動制御方法において、
前記位相の進み又は遅れの検出は、前記電圧の負から正へ又は正から負へのゼロクロスポイントにおいて前記振動変位が正か負かによって行い、
前記周波数の増減を制御する共振点追尾手段を有し、前回の駆動時の前記周波数を記憶し、再駆動時には該記憶した前記周波数で駆動開始させるようにしたことを特徴とする振動フィーダの駆動制御方法。
A movable part and a base are coupled by a spring, an electromagnet is attached to the movable part or the base, and a phase advance or delay between a voltage applied to the coil of the electromagnet and a vibration displacement of the movable part is detected. In the drive control method of the vibration feeder, the frequency of the voltage applied to the coil is increased or decreased to cause resonance vibration so that the phase difference is 180 degrees.
Detection of the advance or delay of the phase is performed depending on whether the vibration displacement is positive or negative at the zero cross point of the voltage from negative to positive or from positive to negative.
Driving a vibration feeder having resonance point tracking means for controlling increase / decrease of the frequency, storing the frequency at the time of previous driving, and starting driving at the stored frequency at the time of re-driving. Control method.
請求項1に記載の振動フィーダの駆動制御方法であって、
前記記憶される前記周波数は、駆動毎に書き変えられるようにしたことを特徴とする振動フィーダの駆動制御方法。
It is a drive control method of the vibration feeder of Claim 1, Comprising:
The vibration feeder drive control method, wherein the stored frequency is rewritten for each drive.
可動部と基台とをばねで結合し、前記可動部か前記基台に電磁石を取付け、該電磁石のコイルに印加される電圧と前記可動部の振動変位との位相の進み又は遅れを位相差検出器により検出して、位相差が180度となるように前記コイルに印加されるべき可変周波数電源の電圧の周波数を増減させて共振振動させるようにした振動フィーダの駆動制御装置において、
前記位相の進み又は遅れの検出は、前記電圧の負から正へ又は正から負へのゼロクロスポイントにおいて前記振動変位が正か負かによって行い、
前記周波数を制御する共振点追尾回路を有し、前回の駆動時の前記可変周波数電源の前記周波数を内蔵するメモリに記憶し、再駆動時には該記憶した前記周波数で駆動開始させるようにしたことを特徴とする振動フィーダの駆動制御装置。
A movable part and a base are coupled by a spring, an electromagnet is attached to the movable part or the base, and a phase difference between a phase advance or a delay between a voltage applied to the coil of the electromagnet and a vibration displacement of the movable part. In a drive control device of a vibration feeder that is detected by a detector and caused to resonate by increasing or decreasing the frequency of the voltage of the variable frequency power supply to be applied to the coil so that the phase difference is 180 degrees,
Detection of the advance or delay of the phase is performed depending on whether the vibration displacement is positive or negative at the zero cross point of the voltage from negative to positive or from positive to negative.
Having a resonance point tracking circuit for controlling the frequency, storing the frequency of the variable frequency power supply at the time of previous driving in a built-in memory, and starting driving at the stored frequency at the time of re-driving. A vibration feeder drive control device.
請求項3に記載の振動フィーダの駆動制御装置であって、
前記記憶される前記前回の駆動時の前記周波数は、駆動毎に書き変えられるようにしたことを特徴とする振動フィーダの駆動制御装置。
It is a drive control apparatus of the vibration feeder of Claim 3, Comprising:
The drive control device for a vibration feeder, wherein the stored frequency at the previous drive is rewritten for each drive.
JP09393898A 1997-10-16 1998-03-23 Drive control method and apparatus for vibration feeder Expired - Fee Related JP4211082B2 (en)

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JP09393898A JP4211082B2 (en) 1997-10-16 1998-03-23 Drive control method and apparatus for vibration feeder

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JP9-299418 1997-10-16
JP29941897 1997-10-16
JP09393898A JP4211082B2 (en) 1997-10-16 1998-03-23 Drive control method and apparatus for vibration feeder

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JP5795841B2 (en) * 2010-05-26 2015-10-14 Ntn株式会社 Control unit for vibratory component feeder
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