| 摘要 |
PURPOSE:To suppress power loss of a brushless motor in small size and to prevent the motor form generating an overvoltage by connecting a spike absorbing auxiliary winding through a diode connected in opposite direction to a power source in parallel with a series circuit of a stator winding and a switching element. CONSTITUTION:The poles of a permanent magnet 1 of a rotor RT are arranged alternately with N- and S-poles. Stator windings L1, L2 are mounted on a main pole 4 opposite to a stator ST, spike absorbing auxiliary windings L3, L4 are lap wound to the windings L1, L2, and the windings L3, L4 are wound in reverse direction to the windings L1, L2 Hall elements H1, H2 and switching transistors (TR)Q1, Q2 are mounted on a printed board 8. The winding L3 is connected via a diode (D)3 in parallel with a series circuit of the winding L2 and the TRQ1, and the winding L4 is connected via a D4 in parallel with a series circuit of the winding L2 and the TRQ2. |
