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    • 38. 发明公开
    • Electrical tool having speed control circuit
    • Elektrisches Werkzeug mit Geschwindigkeitsregelschaltung。
    • EP0086114A1
    • 1983-08-17
    • EP83300669.5
    • 1983-02-10
    • HITACHI KOKI CO., LTD.
    • Shinohara, ShigeruSuzuki, Shun
    • H02P7/00H02P5/40
    • H02P23/0077H02P25/145
    • An electrical tool, such as an electrical drill, is controlled by a microcomputer (8) so that the rotational speed of the electrical motor (3) thereof is set to an optimum value in view of data necessary for determining the speed. In order to input such data, a keyboard (7) is provided. An operator may give the computer various information, such as the diameter of the drill, the material of the workpiece to be machined etc via the keyboard. An optimum motor speed will be found from a data map prestored in a memory, and this optimum speed will be compared with an actual speed measured by a speed sensor (6) so that a voltage control circuit (4) supplying the motor with power is controlled by the result of the comparison for adjusting the motor speed. In one embodiment, two-speed reduction gear mechanism (20) is employed, and an optimum gear ratio is found by the computer. The gear ratio or position is sensed so that an alarm signal is produced when the gear ratio is not optimum. In another embodiment, a gear ratio changing actuator is used for automatically setting the gear ratio to the optimum one. A display (73) may be used to visually show sensed motor speed and other information. Not only the motor speed but also the drill speed may be obtained and displayed on the basis of gear ratio sensed.
    • 电动工具例如电钻由微型计算机(8)控制,使得其电动机(3)的旋转速度根据确定速度所需的数据设定为最佳值。 为了输入这样的数据,提供了键盘(7)。 操作员可以通过键盘向计算机提供各种信息,例如钻头的直径,待加工的工件的材料等。 从存储器中预先存储的数据图可以看到最佳的电动机速度,并且将这个最佳速度与由速度传感器(6)测量的实际速度进行比较,使得向电动机供电的电压控制电路(4)为 由比较结果控制,用于调整电机转速。 在一个实施例中。 采用双速减速齿轮机构(20),计算机发现最佳传动比。 感测比率或位置,使得当齿轮比不是最佳时产生报警信号。 在另一个实施例中。 使用变速比变更执行机构自动将变速比设定为最佳。 可以使用显示器(73)来可视地显示感测的电动机速度和其他信息。 不仅可以根据感测到的齿轮比获得和显示电机转速,而且可以显示钻速。
    • 40. 发明公开
    • Method and control circuit for temperature monitoring of an electric motor
    • Verfahren und Steuerung zurTemperaturüberwachungeines elektrischen Motors。
    • EP0033161A1
    • 1981-08-05
    • EP81100617.0
    • 1981-01-28
    • Black & Decker Inc.
    • Saar, David Alan
    • H02H7/085H02P5/28
    • H02P25/145H02H6/005H02H7/0854H02P23/0077
    • A digital control system for electric motors (90) in power tools of the portable or stationary type includes a microcomputer (126) controlled speed regulator connected to the electric motor (90) for maintaining a preselected speed of the motor (90) substantially constant between no load and full load operation of the motor. The preselected speed is inputted to the microcomputer (126) by means of a rotary switch (128a) or similar input switching arrangement When the tool is just starting or the operator changes the speed switch, the microcomputer (126) controls the speed of the motor (90) to slowly approach the desired speed. The microcomputer (126) is programmed to detect an overload condition and activate an alarm, and an impending kickback condition and stop the electric motor (90).
    • 用于便携式或固定式电动工具的电动机(90)的数字控制系统包括连接到电动机(90)的控制速度调节器的微型计算机(126),用于将电机(90)的预选速度保持在 电机无负载和满载运行。 预选速度通过旋转开关(128a)或类似的输入开关装置输入到微型计算机(126)。 当工具正在启动或者操作者改变速度开关时,微型计算机126控制电动机90的速度以缓慢接近所需速度。 微型计算机(126)被编程为检测过载状况并激活报警,以及即将的反冲状态并停止电动机(90)。