| 摘要 |
PURPOSE:To make frequency into the one lower than that of a speed signal so as to reduce the burden of a controller by changing over it so that the controller may latch the signal from a speed detection circuit when a motor is at low-speed rotation and latch the signal from a magnetic pole position detection circuit when it is at high-speed rotation. CONSTITUTION:A controller latch the speed signal of the output from the speed detection circuit consisting of a sensor 6d and a comparator not shown in the figure when a motor is at low rotation so as to do operate revolution. On the other hand, when it is at high rotation, the controller latches the magnetic pole position signal from the magnetic pole position detection circuit consisting of sensors 6a, 6b, and 6c and a comparator not shown in the figure. Hereby, it operates revolution. |
