| 摘要 |
PURPOSE:To make the changing of rotating direction of a rotor into reverse direction quickly possible by a method wherein the circuit is provided with an exciting condition changing means, changing the exciting condition into the exciting condition of rotation of reverse direction when rotation, reversed to the rotating direction of the rotor, is selected. CONSTITUTION:In the brushless motor control circuit of half-wave control, a commutation signal detecting circuit 20, outputting an ON signal when an induced voltage, generated in armature windings 18a-18c by the rotation of a rotor 21, becomes lower than a predetermined voltage, is provided. Further, an exciting condition changing circuit 12, switching the exciting condition in accordance with a normal/reverse rotation selecting signal based on a normal/ reverse converting signal terminal 4 selecting the normal/reverse rotation of the rotor 21, is also provided. The exciting condition changing circuit 12 changes the exciting condition into another exciting condition determined in accordance with the normal/reverse selecting signal and the ON signal from the commutating signal detecting circuit 20 when the rotation of reverse direction is selected during the rotation of the rotor 21 whereby the excitations of the armature windings 18a-18c are controlled. |
