| 摘要 |
PURPOSE:To prevent a transistor from burning by limiting a motor current within the prescribed time when the motor does not start or stops rotating or becomes low speed state near it. CONSTITUTION:The output of a rotary position sensor DCM 1 of a DC motor is inputted through comparators C1-C3 to a decoder DEC, and transistors Q1-Q6 are turned On and OFF by the output to control the current to a drive coil DCM 2. When the motor does not start or stops rotating or becomes low speed state near it, a current to a drive coil DCM 2 is limited within the prescribed time by gates G1-G6 and monostable multivibrators MS 1-MS 6. |
