| 摘要 |
PURPOSE:To prevent the production of noise when a signal polarity is switched by composing a logic circuit of all transistors to drive 3-phase bipolar motor coils. CONSTITUTION:Signals led to Hall elements Ha-Hc are inverted by the rotation of a rotor whenever the polarity of the rotor is inverted. Currents are flowed to transistors Q3, Q5, Q1 or transistors Q4, Q6, Q2 in response to the inversion. Transistors Q7-Q18 are controlled by the logic signal obtained from the above result, and transistors D1-D6 are further controlled. Currents flowed to 3-phase bipolar motor coils A-C are controlled by the transistors D1-D6. |
