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    • 4. 发明授权
    • Power tool
    • 电动工具
    • US09553542B2
    • 2017-01-24
    • US14744721
    • 2015-06-19
    • MAKITA CORPORATION
    • Yoshitaka MachidaYoshitaka Ichikawa
    • F16D65/14H02P29/00B25D16/00B23D51/16B23D59/00B25D11/00H02P7/18
    • H02P29/20B23D51/16B23D59/001B25D11/00B25D16/00B25D16/006B25D2250/201B25D2250/221H02P7/18
    • A hammer drill (100) comprises an electric motor (110), a piston (127) as a driving member and a controller (199) which controls and drives the electric motor (110). The piston (127) is reciprocated by rotation of the electric motor (110) and thereby a hammer bit (119) is driven in its longitudinal direction. The hammer bit (119) is moved forward in response to a forward movement stroke of the piston (127) and thereby a hammering operation is performed by the hammer bit (119). The controller (199) sets a duty ratio of a driving pulse signal which drives the electric motor (110) in the forward movement stroke of the piston (127) to be larger in order to prevent a reduction of a rotation speed of the electric motor (110) due to a load applied on the electric motor (110) during the forward movement stroke of the piston (127).
    • 锤钻(100)包括电动机(110),作为驱动构件的活塞(127)和控制和驱动电动机(110)的控制器(199)。 活塞(127)通过电动机(110)的旋转而往复运动,从而使锤头(119)在其长度方向上被驱动。 响应于活塞(127)的向前移动行程,锤钻头(119)向前移动,从而通过锤钻头(119)执行锤击操作。 控制器(199)将活塞(127)的前进行程中驱动电动机(110)的驱动脉冲信号的占空比设定得较大,以防止电动机的转速降低 (110)在活塞(127)的向前移动行程期间由于施加在电动机(110)上的负载而产生。
    • 6. 发明授权
    • Motor control device and game machine
    • 电机控制装置和游戏机
    • US09494927B2
    • 2016-11-15
    • US14427375
    • 2013-08-26
    • OMRON Corporation
    • Katsumi MatsushitaYasuyuki ObaHiroyuki Ibuki
    • G05B19/40G05B15/02H02P29/00H02P7/28H02P8/14A63F9/24H02P7/18G05B19/19
    • G05B15/02A63F9/24A63F2009/2447A63F2009/2482G05B19/19G05B2219/33114H02P7/18H02P7/2805H02P8/14H02P29/00
    • A motor control device has a communication unit that receives a control command comprising a motor type identification signal and a rotation signal, wherein the motor type identification signal indicates whether a control object motor is a stepping motor or a DC motor, and wherein the rotation signal designates a target rotation amount and a target rotation speed of the motor, a sensor interface that receives a detection signal from a rotation angle sensor when the control object motor is the DC motor, wherein the rotation angle sensor outputs the detection signal every time the motor rotates by a first rotation angle, a DC motor drive signal generator that generates and outputs a first drive signal rotating the DC motor at the target rotation speed, and a stepping motor drive signal generator that generates and outputs a second drive signal rotating the stepping motor at the target rotation speed.
    • 电动机控制装置具有通信单元,其接收包括电动机类型识别信号和旋转信号的控制指令,其中所述电动机类型识别信号指示控制对象电动机是步进电动机还是DC电动机,并且其中所述旋转信号 指定电动机的目标旋转量和目标转速;传感器接口,当所述控制对象电动机为直流电动机时,所述传感器接口从所述旋转角度传感器接收检测信号,所述旋转角度传感器每当所述电动机 旋转第一旋转角度的直流电动机驱动信号发生器,产生并输出以目标转速旋转直流电动机的第一驱动信号;步进电动机驱动信号发生器,其产生并输出使步进电动机旋转的第二驱动信号 以目标转速。
    • 7. 发明授权
    • Accurate current sensing in H-bridge applications without amplifier having high common mode rejection ratio
    • 不具有高共模抑制比的放大器的H桥应用中的精确电流检测
    • US09240718B2
    • 2016-01-19
    • US14148550
    • 2014-01-06
    • Linear Technology Corporation
    • Kristiaan B. LokereBrendan J. Whelan
    • H02P7/18H02M3/158H02P31/00G01R19/00G01R31/40G01R1/20G01R19/165
    • H02M3/158G01R1/203G01R19/0092G01R19/16538G01R31/40H02P31/00
    • A current sensing circuit may include a shunt resistance through which current to be sensed travels. A first and a second differential amplifier may each provide an amplified output of the voltage across the shunt resistance. A switching system may deliver a current sensing signal output based on the amplified output of the first differential amplifier when the common mode voltage across the shunt resistance is low and based on the amplified output of the second differential amplifier when the common mode voltage across the shunt resistance is high. The first differential amplifier may provide its lowest output DC offset voltage when the common mode voltage is low, while the second differential amplifier may provide its lowest output DC offset voltage when the common mode voltage is high. The first and second differential amplifiers may both have a low common mode voltage rejection ratio, such as a ratio of less than 40 db at the switching frequency of switches that control the current that is sensed.
    • 电流感测电路可以包括分流电阻,通过该分流电阻被感测的电流行进。 第一和第二差分放大器可以分别跨越分流电阻提供电压的放大输出。 当分流电阻两端的共模电压为低电平时,开关系统可以基于第一差分放大器的放大输出传递电流感测信号输出,并且当跨分流器的共模电压时基于第二差分放大器的放大输出 阻力很高。 当共模电压低时,第一差分放大器可以提供其最低输出DC偏移电压,而当共模电压为高时,第二差分放大器可以提供其最低输出DC偏移电压。 第一和第二差分放大器都可以具有低共模电压抑制比,例如在控制感测电流的开关的开关频率下小于40db的比率。