| 摘要 |
PURPOSE: A method for controlling a constant speed of a motor is provided to maintain constantly a rotary speed of a motor by compensating speed errors generated from the motor. CONSTITUTION: A micro computer performs an initialization process and turns off a switch between a prediction compensation portion and the second synthesis portion(ST1,ST2). A motor is driven according to the first control signal(ST3). The motor approaches a constant speed(ST4). The prediction compensation portion stores speed errors from current speed signals of an analog/digital conversion portion and time points for generating the speed errors(ST5 to ST7). The prediction compensation portion obtains a mean value of the speed errors and a mean value of the time points for generating the speed errors(ST8). The switch is turned on(ST9). A motor driving portion drives a drum motor according to the second control signal(ST10). The drum motor is driven with the constant speed(ST11).
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