| 摘要 |
PURPOSE:To minimize a torque ripple and obtain a high driving torque by applying to each stator winding a constant current generated by a constant current unit and distributed by a current distributor while constantly controlling the constant current in a switching section in accordance with the polarity of a rotor. CONSTITUTION:Detection signals obtained through magnetic pole detection elements H1, H2, H3 and differential amplifiers G1, G2, G3 are input into switch actuating sections C1, C2, C3, and the shifting of switching sections S1, S2, S3 is carried out with outputs from the switch actuating sections. The switching sections are formed such that, when N-pole is detected by the magnetic pole detection elements, transistors Tr1, Tr3, Tr5 are turned on and such that, when S-pole is detected by the mentioned elements, transistors Tr2, Tr4, Tr6 are turned on. Since a back electromotive force is applied to stator windings W1, W2, W3, they have different apparent impedance. Therefore, values of current flowing from a constant current unit A to the windings through resistors R2-R7 are forcibly controlled in accordance with the polarities detected by the magnetic pole detection elements H1, H2, H3. |
