发明名称 |
System for adapting the resonant operation of a personal care appliance during the lifetime thereof |
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. |
申请公布号 |
US8314586(B2) |
申请公布日期 |
2012.11.20 |
申请号 |
US20070446780 |
申请日期 |
2007.10.31 |
申请人 |
LUMBANTOBING ARI;MILLER KEVIN;NORG MEINDERT;BAX PIETER JOHANNES;KONINKLIJKE PHILIPES ELECTRONICS N.V. |
发明人 |
LUMBANTOBING ARI;MILLER KEVIN;NORG MEINDERT;BAX PIETER JOHANNES |
分类号 |
H02P3/18;H02H7/08 |
主分类号 |
H02P3/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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