| 摘要 |
<p>A small electronic machine with a vibratory alarm driven by a flat stator type bipolar stepping motor having a rotor of a high durability, capable of being assembled easily, consuming less electric power, capable of being started stably at all times and capable of being rotated at a high speed. This electronic machine generates vibration by rotating an eccentric weight (2) fixed to a rotor (1) which is rotated by a rotary driving system provided with driving pulse generating means (112, 113, 114) adapted to output pulse signals for driving the stepping motor on the basis of an alarm signal outputted at the alarming time, a driving circuit (110) for supplying a driving current to a driving coil (303) on the basis of pulse signals from the driving pulse generating means, a flat stator (6) adapted to transmit a magnetomotive force occurring in the driving coil to the rotor (1), a coil (306) for detecting a back electromotive force occurring due to the rotation of the rotor, and magnetic pole-position detecting means (107, 115, 116) adapted to detect the position of the magnetic pole of the rotor (1) rotating with respect to the flat stator (6) on the basis of the back electromotive force occurring in the back electromotive force detecting coil, and output a detected signal for controlling the output time for a pulse signal from the driving pulse generating means (113) to the same driving pulse generating means. <IMAGE></p> |
