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    • 95. 发明授权
    • Method and compensation modulator for dynamically controlling induction machine regenerating energy flow and direct current bus voltage for an adjustable frequency drive system
    • 用于动态控制感应电机再生能量流和用于变频驱动系统的直流总线电压的方法和补偿调制器
    • US06768284B2
    • 2004-07-27
    • US10260917
    • 2002-09-30
    • Kevin LeeScott K. BeckerKevin J. Schmidt
    • Kevin LeeScott K. BeckerKevin J. Schmidt
    • H02D540
    • H02M7/797H02P21/36
    • A method for dynamically controlling regenerating energy flow and direct current bus voltage for an adjustable frequency drive system includes sensing a direct current voltage of a direct current bus; and sensing a plurality of alternating currents at outputs of an inverter. The sensed alternating currents are transformed to a stationary current vector. Voltage and frequency values are converted to a stationary voltage vector and an angle. The angle and the stationary current vector are transformed to a rotating current vector including torque and flux producing current components. An induction machine generating mode is determined when the torque producing current component reverses polarity. The voltage and frequency values limit the direct current voltage of the direct current bus at a predetermined threshold responsive to the generating mode. The stationary voltage vector and the angle are converted to pulse width modulated control inputs of the inverter.
    • 用于动态地控制可变频驱动系统的再生能量流和直流母线电压的方法包括感测直流母线的直流电压; 并且在逆变器的输出处感测多个交流电流。 所感测的交流电流被转换成固定的电流矢量。 电压和频率值被转换成一个固定的电压矢量和一个角度。 将角度和固定电流矢量转换成包括产生电流分量的转矩和磁通的旋转电流矢量。 当转矩产生电流分量反转极性时,确定感应电机产生模式。 响应于生成模式,电压和频率值将直流总线的直流电压限制在预定阈值。 将稳定电压矢量和角度转换为变频器的脉宽调制控制输入。
    • 96. 发明授权
    • Automatic keyboard testing apparatus
    • 自动键盘测试仪
    • US06304830B1
    • 2001-10-16
    • US09321956
    • 1999-05-28
    • Kevin Lee
    • Kevin Lee
    • G01L2500
    • G01M99/008
    • An automatic keyboard testing apparatus includes a pair of support arms fixed to a machine frame for supporting a keyboard to be tested therebetween. A clamping device secures the keyboard between the support arms. A test module has testing units for operating/testing pushbuttons, a knob and indictors of the keyboard. A key actuating device comprises a plurality of key depressing elements movably mounted thereto. Each key depressing element forms a pressurized air stream outlet for applying a pressurized air stream to a corresponding key of the keyboard for actuating the key. A conveyor mechanism moves the key actuating device across the keyboard for sequentially actuating the keys of the keyboard. A keyboard coupling device electrically couples the keyboard to a processor-based determination device to receive signals therefrom for determining if the tested keyboard is properly functioning. A warning device is connected to the determination device for giving off a warning signal when the keyboard fails the test.
    • 一种自动键盘测试装置,包括一对固定在机架上的支撑臂,用于支撑要在其间测试的键盘。 夹紧装置将键盘固定在支撑臂之间。 测试模块具有用于操作/测试按钮的测试单元,键盘的旋钮和指示器。 钥匙致动装置包括可移动地安装到其上的多个按键元件。 每个按键元件形成加压空气流出口,用于将加压空气流施加到键盘的相应键以致动键。 传送机构使钥匙致动装置通过键盘移动,以顺序地致动键盘的键。 键盘耦合装置将键盘电耦合到基于处理器的确定装置以从其接收信号,以确定测试的键盘是否正常工作。 警告装置连接到确定装置,用于当键盘未通过测试时发出报警信号。