| 摘要 |
PROBLEM TO BE SOLVED: To obtain the control circuit of a DC brushless motor by providing the number-of-revolution determining part of the DC brushless motor in a microcomputer having the speed-control command function for determining the number of revolution of the motor and the function for generating PWM signals based on the speed control command. SOLUTION: An electrically rewritable nonvolatile memory 11 is connected to a microcomputer 2. The data of number of revolution for determining the number of revolution of a DC brushless motor 1, which are stored in the nonvolatile memory 1, are read out. The PWM signals based on the data are formed in a PWM circuit 22 and inputted into an integrator 9. The integrator 9 integrates the PWM signals outputted from the microcomputer 2 to form the analog voltage signal and compare the signal with the signal from a triangular-wave generator 8 in a comparator 7 to form the DC power supply voltage of an arbitrary voltage from a DC power supply 10 based on the obtained variable-duty PWM signal. Thus, the control circuit of the DC brushless motor 1 can be obtained. |
