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    • 10. 发明授权
    • Motor controller and electric tool having the same
    • 电机控制器和电动工具具有相同的功能
    • US08294399B2
    • 2012-10-23
    • US12734645
    • 2008-12-01
    • Jiro SuzukiTakuya Kusakawa
    • Jiro SuzukiTakuya Kusakawa
    • H02P1/04H02P1/24H02P25/14H02P7/06H02P6/00E21B15/04E21B3/00B25D13/00
    • B25F5/00B25B21/02H02P6/12H02P6/24H02P6/28H02P29/032
    • A motor controller comprises a processor selectively outputting an on-signal to either one of an upper arm switching element and a lower arm switching element based upon a detected position by the position sensor, gate drivers inputting a driving voltage to the gates of the switching elements by shifting a level of the on-signal from the processor to the upper arm switching element and a bootstrap capacitor configured to be charged while the upper arm switching element is turned off and to behave as a voltage supply for the gate driver while the upper arm switching element is turned on. The processor is configured to reduce a set duty ratio when the set duty ratio is equal to or larger than a predetermined value (e.g. 80 percents) and a rotational position of the motor does not change for a first predetermined time. This motor controller can prevent the switching element from a burnout even if the motor is locked.
    • 电动机控制器包括:处理器基于位置传感器的检测位置,选择性地将接通信号输出到上臂开关元件和下臂开关元件中的任一个,栅极驱动器将驱动电压输入到开关元件的栅极 通过将来自处理器的导通信号的电平移动到上臂开关元件和被配置为在上臂开关元件关闭时被充电并且作为栅极驱动器的电压供应而起作用的自举电容器,而上臂 开关元件导通。 处理器被配置为当设定的占空比等于或大于预定值(例如80%)时减小设定的占空比,并且电动机的旋转位置在第一预定时间内不改变。 即使电机被锁定,该电机控制器也可以防止开关元件烧坏。