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METHOD AND SYSTEM FOR CONTROLLING AN ELECTRIC MOTOR WITH VARIABLE SWITCHING FREQUENCY AT VARIABLE OPERATING SPEEDS
METHOD AND SYSTEM FOR CONTROLLING AN ELECTRIC MOTOR WITH VARIABLE SWITCHING FREQUENCY AT VARIABLE OPERATING SPEEDS
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机译:在变速操作速度下以可变开关频率控制电动机的方法和系统
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摘要
A data processor establishes a first range of rotational speeds of a rotor of the motor from a first lower limit to a first higher limit and a second range of rotational speeds from a second lower limit to a second higher limit. A hysteresis band or a rotational range of speeds is established such that during operation in the first range the first higher limit is adjusted (e.g., raised by a first amount to be greater than the second lower limit). A sensor detects or measures a rotational speed of a rotor of the motor. The data processor determines whether the measured rotational speed falls within the first range or the second range, as adjusted by the hysteresis band, to identify a selected speed range. A switching frequency of a pulse-width modulation signal is varied in accordance with the selected speed range.
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