Electric hair cutter and control method for motor rotational speed thereof
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United States of America Patent
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Sep 16, 2014
Issued Date -
N/A
app pub date -
Nov 3, 2011
filing date -
Nov 3, 2011
priority date (Note) -
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Abstract
In an electric hair cutter and a control method for its motor rotational speed, the electric hair cutter includes a main body, a BLDC (brushless DC) motor, a power source, a detecting unit, an electrical energy adjusting unit and a control module. The main body has a cutting unit. The BLDC motor drives the cutting unit. The detecting unit can detect the counter-electromotive force of the BLDC motor. The control module may receive the counter-electromotive force signals detected by the detecting unit and may control the electrical energy adjusting unit according to the counter-electromotive force signals so as to keep the BLDC motor rotating at a fixed RPM.
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