| 摘要 |
PURPOSE:To reduce in size a brushless motor and to decrease the number of leads by reducing leads for inputting signals from a sensor group to a driving circuit to one, and externally extending it from a board. CONSTITUTION:A brushless motor is composed of a pivotal shaft, bearings, a hub, a magnetic fluid seal, a rotor member, a stable and a board. A D/A converter 13 for converting digital signals from a sensor group 11 to analog signals is provided on the board, and one lead 14 is externally extended from the board via a through hole 8 of a holding board. The lead 14 serially outputs an analog signal from the converter 13. The lead 14 is connected to an A/D converter 15 for recovering the analog signal to the digital signal of the original. Thus, the work for externally extending the signal line from the board is facilitated, and a circuit 17 in the motor may be isolated from a driving circuit 16. |
