| 摘要 |
PURPOSE:To prevent the occurrence of noises by simple constitution. CONSTITUTION:A driver 1 is equipped with an inverter circuit 6 which supplies coils 3, 4, and 5 with drive signals of U phase, V phase, and W phase, respectively. The driver 1 is constituted as an integrated circuit element, and is provided with a rotation pulse detecting circuit 8 which detects the rotational speed or rotation cycle of a motor 2 from the magnetic flux detection signal outputted from a magnetic pole detecting element H. The driver 1 has a speed command part 9 for generating speed command input corresponding to the predetermined reference rotational speed of a motor 2, and a rotation cycle signal, detection signals h1, h2, and h3, and speed command input are inputted into a sine wave making circuit 10. The sine wave making circuit 10 generates control signals nearly in sine waves of three phases having phase difference of 120 deg. with each other, from the positional information and speed command input of a rotor 19 being gotten at every 60 deg. in electric angle by rotation cycle and detection signals h1, h2, and h3. |
