| 摘要 |
PURPOSE:To prevent the breakdown and burning of a motor by stopping the motor when an abnormal state of a position detection signal is detected. CONSTITUTION:A brushless motor 6 is constituted of a plurality of position detectors H1-H3 for loader position detection, the motor windings L1-L3 and a TG(Tacho Generator) to detect the speeds. And, the output of these position detectors H1-H3 are connected to the address terminals A2-A4 of a memory element ROM3. For this ROM3, a pulse with modulation signal PWM starting signal and a rotating direction signal of the motor 6 are connected to the address terminals A1, A0, and A5 respectively from a microcomputer 1. The output terminals D0-D5 are connected to the power transistors Q1-Q6 constituting a driver 4. Accordingly, an orderly position detection signal is filed in the memory of ROM3 in normal rotation previously; therefore, this signal is compared with the position detection signal is actual rotation, and it is proved that the discordance is abnormality. |
