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2. 发明授权

US5212437A High speed starter operations monitor 失效
标题翻译：高速起动器运行监视器
公开(公告)号：US5212437A
公开(公告)日：1993-05-18
申请号：US739837
申请日：1991-08-02
申请人： Donald A. Hescht , Walter A. Dupuis , William E. Szabo , Theodore A. Resnick
发明人： Donald A. Hescht , Walter A. Dupuis , William E. Szabo , Theodore A. Resnick
IPC分类号： A61B6/03 , H05G1/66
CPC分类号： A61B6/032 , H05G1/66 , A61B6/4021
摘要： An x-ray tube (10) of a CT scanner has a rotating anode and rotor combination which is propelled by AC currents applied to run and phase windings (42, 46) by a starter (22). A monitor (24) includes Hall effect current detectors (40, 44) which detect the actual current flowing through the run and phase windings. The detected analog current values, voltage values, and the like are multiplexed (132) and digitized in a preselected order by an analog to digital converter (60) and stored in that order in a FIFO memory (62). A microprocessor (64) performs a Fourier transform (94, 96) to convert the digital run and phase signals into frequency spectra. The run and phase frequency spectra are compared (100, 102, 104, 106) with frequency spectra indicative of rotor speed, bearing wear, anode vibration, failure of the anode to rotate, and other conditions, analyzed for symmetry or other characteristics, or the like (FIG. 5 ) to generate digital run and phase reference signals. An error amplifier (54) controls a pulse width modulator ( 56) or other power amplifier controls in accordance with a deviation between analog reference signals converted from the digital signals by a reference digital to analog converter (66) and the actually sensed run and phase signals (40, 44) to adjust the starter. A direct coupled driver (122) adjusts DC offsets in the drive currents to maintain balance and drive efficiency.
摘要翻译： CT扫描器的X射线管（10）具有旋转阳极和转子组合，其由通过起动器（22）施加到运行和相绕组（42,46）的AC电流推动。监视器（24）包括霍尔效应电流检测器（40,44），其检测流过运行和相绕组的实际电流。检测到的模拟电流值，电压值等被模数转换器（60）以预选的顺序复用（132）并数字化，并以该顺序存储在FIFO存储器（62）中。微处理器（64）执行傅里叶变换（94,96）以将数字运行和相位信号转换成频谱。将运行和相位频谱与100Hz，102,104,106）进行比较，其频谱表示转子速度，轴承磨损，阳极振动，阳极转动故障以及其他条件，分析对称性或其他特性，或（图5）以产生数字运行和相位参考信号。误差放大器（54）根据由参考数模转换器（66）从数字信号转换的模拟参考信号之间的偏差和实际检测到的运行和相位来控制脉冲宽度调制器（56）或其它功率放大器控制信号（40,44）来调节起动器。直接耦合驱动器（122）调节驱动电流中的直流偏移以保持平衡和驱动效率。

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