首页>
外国专利>
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
展开▼
机译:用于在其使用寿命期间对个人护理用具进行谐振操作的系统
展开▼
页面导航
摘要
著录项
相似文献
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.
展开▼