To provide an electric hoist designed to reduce cost and capable of performing a suspended load landing operation for softening shocks to the suspended load irrespective of a worker's skill.SOLUTION: The electric hoist is provided with: a torque command value calculation unit 71 that is calculated inside an inverter 7; an output torque detection unit 81 that fetches the value of the torque command value calculation unit into an inverter control unit 8 after the lapse of prescribed time; a detected torque storage unit 82 that stores torque detected by the output torque detection unit; a detected torque comparison unit 83 that compares the detected torque with detected torque of last prescribed time; a hook position storage unit 84 that stores a hook position detected by an encoder 9 when hoisting is carried out in responce to a hoisting command and the number of matching times of the comparison results of the detected torque comparison unit reaches the prescribed number of times; and a hoisting deceleration determination unit 85 that carries out high-speed winding-down until the stored hook position is reached in response to a winding-down command, and reduces the speed to low-speed winding-down when the stored hook position is reached.SELECTED DRAWING: Figure 7

    【課題】吊荷への衝撃緩和を行う吊荷の着床作業を、作業者の技量に関わらずに行うことができ、コスト低減を考慮した電動巻上機を提供する。【解決手段】電動巻上機であって、インバータ7の内部で算出されるトルク指令値算出部71と、トルク指令値算出部の値を規定時間経過後にインバータ制御部8に取込む出力トルク検出部81と、出力トルク検出部による検出トルクを保存する検出トルク保存部82と、検出トルクと保存した1つ前の規定時間の検出トルクを比較する検出トルク比較部83と、巻上指令により巻上を行ない、検出トルク比較部による比較結果が一致した回数が規定回数に達したときにエンコーダ9により検出したフック位置を記憶するフック位置記憶部84を有し、巻下指令により高速巻下を記憶したフック位置に達するまで行ない、記憶したフック位置に到達した際に低速巻下に速度を落とす巻下減速判定部85を備える。【選択図】図7


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    Title :

    ELECTRIC HOIST AND OPERATION CONTROL METHOD THEREOF


    Additional title:

    電動巻上機、及びその運転制御方法


    Contributors:

    Publication date :

    2019-06-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66D Haspeln , CAPSTANS



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