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    • 1. 发明申请
    • LOW PROFILE ELECTRIC SANDER
    • 低型电动机
    • WO2005102602A2
    • 2005-11-03
    • PCT/US2005/012006
    • 2005-04-12
    • BLACK & DECKER INC.DESHPANDE, Uday, S.GORTI, Bhanuprasad, V.MELVIN, Jason, R.RICE, Gregory, A.WIKLE, DavidWAIKAR, Shailesh, P.HILSHER, William, F.
    • DESHPANDE, Uday, S.GORTI, Bhanuprasad, V.MELVIN, Jason, R.RICE, Gregory, A.WIKLE, DavidWAIKAR, Shailesh, P.HILSHER, William, F.
    • B24B23/00
    • B24B23/03
    • A power tool is a "low profile" power tool, that is the overall height of the power tool is sufficiently small that a user can grasp the top of the power tool with the user's hand and the hand will be positioned relative close to the bottom of the power tool compared with existing power tools. The low profile power tool uses a low profile motor having a diameter to lamination height ratio of at least 2:1. In an aspect of the invention, the motor is an electronically commutated "pancake" style motor. In an aspect of the invention, the power tool is a random orbital sander or an orbital sander having a motor that provides at least 40 watts of power. In an aspect of the invention, the sander has a mechanical brake that brakes the orbital mechanism and the motor is dynamically braked. In an aspect of the invention, the motor is an electronically commutated motor and a motor controller for it changes the speed of at which it runs the motor from an idle speed to a sanding speed upon the motor speed dropping from idle speed to an idle speed threshold value and changes the speed at which it runs the motor from sanding speed to idle speed upon the motor speed increasing from sanding speed to a sanding speed threshold value.
    • 电动工具是“薄型”电动工具,即电动工具的整体高度足够小,使得用户可以用用户的手抓住电动工具的顶部,并且手将相对靠近底部定位 的电动工具与现有的电动工具相比。 低轮廓动力工具使用具有至少2:1的直径与层压高度比的低轮廓马达。 在本发明的一个方面,电动机是电子换向的“煎饼”型电动机。 在本发明的一个方面,电动工具是随机轨道打磨机或具有提供至少40瓦特功率的电动机的轨道磨光机。 在本发明的一个方面,砂光机具有制动轨道机构的机械制动器,并且马达被动态地制动。 在本发明的一个方面,电动机是电子换向电动机,并且电动机控制器用于在电动机速度从怠速下降到怠速时将其运行电动机的速度从空转速度改变到打磨速度 阈值,并将电机从打磨速度运行的速度从磨砂速度改变为怠速,电机速度从砂磨速度增加到砂磨速度阈值。