| 摘要 |
PURPOSE:To prevent a rotor from reversely rotating at the time of starting by feeding direct current to respective phases at the same time, to store energy in exciting coils, and by detecting ther difference of the energy, to create control signal in the direction of rotation. CONSTITUTION:When a switch S is turned ON, then via a change-over circuit 6, specification is performed to a full electrification specifying circuit 7, and transistors Q10, Q20 are turned ON, and exciting coils 11, 12 are excited, and energy is stored. When the switch S is turned OFF, then the energy stored in the exciting coils 11, 12 is released, and via resistors r1, r2, current flows. Each energy stored in the coils 11, 12 is different from each other and so each current flowing to the resistors r1, r2 is different from each other, and a difference is generated on input to a comparator 4. From the comparator 4, signal according to the degree of the input is generated, and by a forward rotation signal output circuit, the position of a rotor 2 is known through the signal, and an exciting method necessary for rotating the rotor forward is discriminated, and via a gate circuit 10, the transistors Q10, Q20 are driven. |
