Abstract A motor control device is disclosed. The device comprises an electric motor, a first counter for counting clock signals having a certain frequency, means for resetting the first counter by an output corresponding to a rotational frequency of the motor and storing a counted content of the first counter immediately before the reset, a second counter for counting clock signals having a certain frequency higher than the above clock signal, and means for comparing the content of the first counter with that of the second counter, resetting the second counter by a coincidence of both the contents, generating output signals from the reset the second counter to the reset of the first counter, and controlling a rotational frequency of the motor by the output signals.
A motor control device comprising an electric motor, a first counter for counting clock signals having a certain frequency, means for resetting the first counter by an output corresponding to a rotational frequency of the motor and storing a counted content of the first counter immediately before the reset, a second counter for counting clock signals having a certain frequency higher than the above clock signal, and means for comparing the content of the first counter with that of the second counter, resetting the second counter by a coincidence of both the contents, generating output signals from the reset of the second counter to the reset of the first counter, and controlling a rotational frequency of the motor by the output signals.
Claim 2
Dependent Claim
122 words
A motor control device comprising an electric motor, a first counter for counting clock signals having a certain frequency, means for resetting the first counter by an output corresponding to a rotational frequency of the motor and storing a counted content of the first counter immediately before the reset, a second counter for counting clock signals having a certain frequency higher than the above clock signal, and means for comparing the content of the first counter with that of the second counter, resetting the second counter by a coincidence of both the contents, generating output signals from the reset of the second counter to the reset of the first counter, and controlling a rotational frequency of the motor by the output signals.
Claim 3
Dependent Claim
22 words
A motor control device as claimed in claim 1, wherein a frequency of clock signals of the second counter is made variable.
Claim 4
Dependent Claim
17 words
A motor control device as claimed in claim 1, wherein the electric motor is a D.C. motor.