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1. 发明公开

EP0808011A1 Anti-kickback and breakthrough torque control for power tool 失效
标题翻译： Anti-Rückschlag-und Durchbruchmomentsteuerungfürein Motorwerkzeug
公开(公告)号：EP0808011A1
公开(公告)日：1997-11-19
申请号：EP96303329.5
申请日：1996-05-13
申请人： Black & Decker Inc.
发明人： Thompson, Stephen S. , Patel, Falgun , Huber, Paul G.
IPC分类号： H02H7/085
CPC分类号： H02H7/0858 , H02H7/0833 , H02H7/0854
摘要： The invention provides a method of controlling a power tool having a motor that imparts torque to an output spindle when actuated by an operator acutable switch. The method comprises

sensing a motor parameter and detecting a rapid change in the value of said parameter indicative of the onset of an impending stall condition; and
while the switch remains actuated, pulsing the motor a plurality of times to deliver a series of torque pulses having a peak torque substantially greater than the average torque delivered during the series.

The invention further provides a motor control circuit for an electric power tool (10). The circuit comprises:

a drive circuit (36) coupled to the motor (16) for controlling the application of current to the motor;
a processor (30) coupled to the drive circuit (36) and providing a processor output signal for controlling the drive circuit;
a current sensor (38, 40) coupled to the drive circuit (36) for sensing a parameter indicative of motor current and coupled to the processor (30) for providing a first processor input signal;
the processor (30) having first means (108 - 114) for detecting a rapid change in the value of the first processor input signal for detecting the onset of a stall condition;
the processor further having second means (142) for using the processor output signal to apply current pulses to the motor in response to the detected onset of a stall condition.
摘要翻译：本发明提供了一种控制电动工具的方法，所述电动工具具有电动机，所述电动机在由操作者可触发开关致动时将扭矩施加到输出心轴。该方法包括感测电机参数并检测表示即将发生的失速状态的开始的所述参数的值的快速变化; 并且当开关保持致动时，脉冲电动机多次以递送一系列扭矩脉冲，其具有基本上大于串联期间输送的平均转矩的峰值扭矩。本发明还提供一种用于电动工具（10）的电机控制电路。电路包括：驱动电路（36），耦合到马达（16），用于控制电流施加到马达; 处理器（30），其耦合到所述驱动电路（36）并提供用于控制所述驱动电路的处理器输出信号; 耦合到所述驱动电路（36）的电流传感器（38,40），用于感测指示电动机电流并且耦合到所述处理器（30）的参数，用于提供第一处理器输入信号; 处理器（30）具有用于检测第一处理器输入信号的值的快速变化的第一装置（108-114），用于检测失速状态的开始; 处理器还具有第二装置（142），用于响应于检测到的失速状态的开始，使用处理器输出信号向电动机施加电流脉冲。

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