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    • 2. 发明授权
    • Apparatus and method for determining shaft speed of a motor
    • 用于确定电机轴速度的装置和方法
    • US06449567B1
    • 2002-09-10
    • US09181149
    • 1998-10-27
    • Binish P. DesaiMartin J. Dowling
    • Binish P. DesaiMartin J. Dowling
    • G06F1900
    • G01R31/343
    • Briefly stated the motor speed monitor includes a method of determining a shaft speed of a motor by using an electrical signature of the motor. The method includes: (a) sensing an electrical current supplied to the motor to generate a current sensor output signal for at least one electrical phase of the motor; (b) demodulating the current sensor output signal for a predetermined time interval to obtain an instantaneous amplitude of the electrical current signal; (c) generating a frequency spectrum of the instantaneous current amplitude; (d) finding at least one spectral peak of the instantaneous current amplitude frequency spectrum within a predetermined shaft frequency sideband range; (e) estimating a shaft frequency from the at least one spectral peak and converting the shaft frequency to shaft speed.
    • 简而言之,电动机速度监视器包括通过使用电动机的电气特征来确定电动机的轴速度的方法。 该方法包括:(a)感测供应给电动机的电流以产生用于电动机的至少一个电相的电流传感器输出信号; (b)以预定时间间隔解调电流传感器输出信号以获得电流信号的瞬时振幅; (c)产生瞬时电流幅度的频谱; (d)在预定的轴频边带范围内找到瞬时电流振幅频谱的至少一个频谱峰值; (e)从所述至少一个频谱峰值估计轴频率并将轴频率转换为轴速度。