| 摘要 |
PURPOSE: An apparatus for automatically controlling a motor voltage is provided to stably control the motor speed by changing a motor driving voltage from a lower voltage to a high voltage according to a load change of a motor. CONSTITUTION: A power supply(10) outputs a lower voltage and a high voltage. A motor controller(40) drives a motor(30). A microcomputer(50) continues to estimate a load change of the motor(30) and changes a voltage applied to the motor(30) from the lower voltage to the higher voltage. A voltage down(70) adjusts the lower voltage from the power supply(10) to a usage voltage of the microcomputer(50). The microcomputer(50) detects an amplitude of the lower voltage supplied to the voltage down(70) based on the voltage adjusted by the voltage down(70). When an amplitude of the detected lower voltage is greater than a predetermined voltage, the microcomputer(50) maintains Vcc at a high level, and a switching status of a switching circuit(20) to continuously apply the lower voltage to the motor(30).
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