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System for adapting the resonant operation of a personal care appliance during the lifetime thereof
System for adapting the resonant operation of a personal care appliance during the lifetime thereof
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机译:用于在个人护理设备的使用寿命内调整其共振操作的系统
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摘要
The adapting system for a resonant drive appliance includes a circuit for measuring the back EMF induced in the stator coil of the motor following turn-off of the appliance. The frequency of the back EMF signal is determined from the zero crossings of the EMF signal. The determined frequency is then compared with a running average of previous frequency determinations, and the drive frequency of the appliance is adjusted if the difference between the compared frequencies is greater than a threshold value, e.g. 1 Hz.
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