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公开(公告)号：US4722021A
公开(公告)日：1988-01-26
申请号：US915919
申请日：1986-10-03
CPC分类号： B28D1/14 , B23B45/00 , F16P7/00 , H02H3/14 , Y10S388/903 , Y10S388/909 , Y10S388/919 , Y10S388/937
摘要： To detect if a tool bit, such as a drill, a saw blade, or the like, upon being worked into a wall, meets a metallic obstruction, such as a conduit, reinforcement rod, hydraulic pipe or the like, an alternating voltage, preferably between 2 and 20 kHz, is coupled through a coupling capacitor (9) to the tool bit, and current flow to the tool bit is detected by a current measurement stage (10; 31, 32) to disconnect energy to the drive motor (5), for example by disabling firing of a thyristor (15), or closing a valve of a compressed-air tool. The coupling capacitor should have a capacity small enough to provide high impedance to network power frequency, and to insure a substantial change in current being supplied to the tool bit holder, typically a chuck, if the tool bit meets a metallic object in the wall. The a-c supply circuit can be formed as part of a trigger circuit for the thyristor, by pulse-energizing a trigger diode (28) upon repetitive charge of a capacitor (26) through a charging network (22, 23, 24, 25).
摘要翻译： 为了检测工具钻头（例如钻头，锯片等）在被加工成墙壁时是否遇到金属阻塞物，例如导管，加强杆，液压管等，交流电压， 优选地在2和20kHz之间，通过耦合电容器（9）耦合到工具头，并且通过电流测量级（10; 31,32）检测到工具位的电流流动以将能量断开到驱动电动机 5），例如通过禁止烧制可控硅（15）或关闭压缩空气工具的阀。 耦合电容应具有足够小的能力，以提供对网络功率频率的高阻抗，并且如果工具头与壁中的金属物体相遇，则确保将电流提供给工具头座（通常为卡盘）的实质变化。 a-c电源电路可以形成为用于晶闸管的触发电路的一部分，通过在电容器（26）经过充电网络（22,23,24,25）重复充电时，通过脉冲激励触发二极管（28）。
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公开(公告)号：US4392093A
公开(公告)日：1983-07-05
申请号：US233587
申请日：1981-06-04
CPC分类号： H02P25/10 , Y10S388/919 , Y10S388/922
摘要： An electronic control and regulating system for AC-operated appliances, especially universal motors and with symmetrical phase control. The control circuit includes among other things an inductive current-voltage converter 9, the primary side 8 of which is connected to the load current circuit and in which, in addition to the converter function, the inductivity of the secondary winding 10 is used and becomes a component of a resonant circuit 20 which is tuned approximately to the frequency of the AC voltage source. The feedback variable of the control system is formed by the resonant circuit voltage, i.e. the resonant circuit impedance, which depends not only on the magnitude of the load current but also on the phase angle of the load current. This quasi-resonance effect makes possible a direct influence of the trigger circuit which consists customarily of a trigger capacitor 13, a load resistor 11 and a trigger diode 15 and is possible without excessive use of additional circuit elements.
摘要翻译： PCT No.PCT / EP80 / 00038 Sec。 371日期：1981年6月4日 102（e）日期1981年1月27日PCT归档1980年6月28日PCT公布。 公开号WO81 / 01085 日期：1981年04月16日。一种用于交流电器的电子控制和调节系统，特别是通用电动机，具有对称的相位控制。 控制电路还包括感应电流 - 电压转换器9，其初级侧8连接到负载电流电路，并且除了转换器功能之外，使用次级绕组10的电感，并且变成 谐振电路20的分量近似地被调谐到交流电压源的频率。 控制系统的反馈变量由谐振电路电压即谐振电路阻抗形成，谐振电路电阻不仅取决于负载电流的大小，而且取决于负载电流的相位角。 这种准共振效应使触发电路的直接影响成为可能，触发电路通常由触发电容器13，负载电阻器11和触发二极管15组成，并且可以不过度使用额外的电路元件。
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3.发明授权
公开(公告)号：US4982143A
公开(公告)日：1991-01-01
申请号：US306483
申请日：1989-02-03
CPC分类号： H02H6/00 , H02H7/0852
摘要： Thermal overload of a motor is avoided by measuring temperature and, when a limit temperature is exceeded, reducing the phase "window" within each power cycle during which the motor is energized. The limit temperature is sensed by a temperature sensor which is warmed either by heat conduction through a cooling body or by an air stream from the motor. The overload protection apparatus requires no measuring resistance in the load circuit.
摘要翻译： 通过测量温度来避免电机的热过载，当超过极限温度时，减少电机通电期间的每个电源周期内的相位“窗口”。 极限温度由温度传感器感测到，温度传感器通过冷却体的热传导或来自电动机的气流加热。 过载保护装置在负载电路中不需要测量电阻。
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公开(公告)号：US4213077A
公开(公告)日：1980-07-15
申请号：US936324
申请日：1978-08-24
CPC分类号： H02P25/145
摘要： A transformer having a secondary winding that delivers a regulating magnitude to a speed regulator circuit that approaches zero as the speed approaches the speed setting, is provided with two primary windings wound and connected so that they oppose each other in operation. The first is the conventional primary winding in series with the universal motor of which the speed is being controlled (as by a conduction phase angle control of the input voltage) while the second primary winding is in series with a resistance and, in some cases, also with a capacitor, with this series combination being connected in parallel with the armature winding of the motor for the best regulation, or in parallel with the motor as a whole if it is important to avoid additional internal connections to the motor. The capacitor is used to compensate for the inductive reactance of the second primary winding in cases in which that reactance is not negligible. A second capacitor across the secondary filters out commution "hash."
摘要翻译： 具有次级绕组的变压器具有将速度调节器电路传递到速度接近速度设定时接近零的调节幅度的二次绕组，该二次绕组被缠绕并连接成使得它们在操作中彼此相对的两个初级绕组。 第一个是传统的初级绕组与其速度被控制的通用电动机（如通过输入电压的导电相位角控制）串联，而第二初级绕组与电阻串联，并且在一些情况下， 还有一个电容器，这个串联组合与电动机的电枢绕组并联连接，以实现最佳的调节，或者如果重要的是避免与电机的额外的内部连接，那么这个组合应该与整个电动机并联。 在电抗不可忽略的情况下，电容器用于补偿第二初级绕组的感抗。 二次滤波器上的第二个电容滤除掉杂散“哈希”。
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