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    • 33. 发明申请
    • Rotation positioning device for a coil of a magnetic resonance imaging apparatus
    • 用于磁共振成像装置的线圈的旋转定位装置
    • US20060241393A1
    • 2006-10-26
    • US11323668
    • 2005-12-30
    • Ke LiuTing XueJian Wang
    • Ke LiuTing XueJian Wang
    • A61B5/05
    • G01R33/34046A61B5/0555
    • A rotation positioning device for a coil of a magnetic resonance imaging apparatus, having a cavity in the coil for accommodating a part to be examined, has a backing member that can freely rotate within this accommodating cavity. The backing member is provided with a first driving member and a first rotating member, and the coil is provided with a second driving member and a second rotating member. The first driving member and the second driving member form a transmission pair, and the first rotating member can rotate relative to the second rotating member under the drive of the first driving member and the second driving member. The second driving member can be driven manually or by an external driving source connected thereto to drive the first driving member, thereby driving the backing member to rotate via the cooperation of the first rotating member and the second rotating member. Also, by appropriate configuration of parameters, such as position and size, of the first driving member and the second driving member, the rotation angle or range of the backing member can be controlled precisely and quantitatively.
    • 用于磁共振成像装置的线圈的旋转定位装置具有用于容纳待检查部件的线圈中的空腔,具有能够在该容纳腔内自由旋转的背衬构件。 背衬构件设置有第一驱动构件和第一旋转构件,线圈设置有第二驱动构件和第二旋转构件。 第一驱动构件和第二驱动构件形成传动对,并且第一旋转构件可以在第一驱动构件和第二驱动构件的驱动下相对于第二旋转构件旋转。 第二驱动构件可以手动地或通过与其连接的外部驱动源来驱动以驱动第一驱动构件,从而通过第一旋转构件和第二旋转构件的协作来驱动背衬构件旋转。 此外,通过适当配置第一驱动构件和第二驱动构件的诸如位置和尺寸的参数,可以精确地和定量地控制背衬构件的旋转角度或范围。
    • 35. 发明授权
    • Current limitation process of brush and brushless DC motors during severe voltage changes
    • 刷电机和无刷直流电机在严重电压变化时的电流限制过程
    • US06801009B2
    • 2004-10-05
    • US10305607
    • 2002-11-27
    • John Edward MakaranKe Liu
    • John Edward MakaranKe Liu
    • H02H708
    • H02P29/02H02P6/28Y10S388/903
    • A closed-loop control system for a DC motor includes a DC motor 12, a current sensor 14 for determining a current of the motor, a voltage sensor 32 for measuring a voltage of the motor 12, and a micro-controller 33. The micro-controller is constructed and arranged to (1) compare the determined current with a set point and output a pulse width modulated (PWM) duty cycle to control the motor, and (2) calculate a PWM duty cycle limit based on the measured voltage and compare the outputted PWM duty cycle to the PWM duty cycle limit such that when the outputted PWM duty cycle greater than the PWM duty cycle limit, the outputted PWM duty cycle is set to the PWM duty cycle limit. A method, in a DC motor, of preventing a current surge during severe voltage changes is also disclosed.
    • 用于DC电动机的闭环控制系统包括DC电动机12,用于确定电动机电流的电流传感器14,用于测量电动机12的电压的电压传感器32和微控制器33.微型 - 控制器被构造和布置为(1)将确定的电流与设定点进行比较,并输出脉宽调制(PWM)占空比来控制电动机,以及(2)基于测量的电压计算PWM占空比极限, 将输出的PWM占空比与PWM占空比限制进行比较,使得当输出的PWM占空比大于PWM占空比限制时,输出的PWM占空比被设置为PWM占空比限制。 还公开了一种在直流电动机中在严重电压变化期间防止电流浪涌的方法。