Electric hair cutter and control method for motor rotational speed thereof

摘要

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.

主权项

1. An electric hair cutter, comprising:
a main body, having a cutting unit; a brushless DC (BLDC) motor, which drives the cutting unit; a power source, which provides electricity to the BLDC motor; a detecting unit, which detects counter-electromotive force signals of the BLDC motor; an electrical energy adjusting unit, which is electrically connected with the BLDC motor and the power source and adjusts current fed from the power source to the BLDC motor; and a control module, which receives counter-electromotive force signals detected by the detecting unit and controls the electrical energy adjusting unit according to the counter-electromotive force signals so as to keep the BLDC motor rotating at a fixed RPM.