| 摘要 |
PURPOSE:To allow detection of the phase current of a motor through a simple constitution. CONSTITUTION:A driver 21 comprises an inverter circuit 27 for feeding drive signals to phases U, V, W of coils 23, 24, 25 and an inverter circuit 27 comprises six transistors Q1, Q2, Q3, Q4, Q5, Q6. The transistors Q1, Q2, Q3 have collectors connected with the positive pole of a DC power supply 28 and emitters connected with the collectors of the transistors Q4, Q5, Q6 having emitters connected through phase current detecting resistors Ru, Rv, Rw with the negative pole of the DC power supply 28. Voltage signal at the joints of the emitters of the transistors Q4, Q5, Q6 and the resistors Ru, Rv, Rw are fed to phase current detection circuits 34, 35, 36. |
