초록 ▼

The present invention provides method and apparatus to control a plurality of DC motors each having an encoder by a sole microcomputer. The actual rotating speed of each DC motor is detected in response to the signal from the encoder. A pulse width of a voltage which is applied to each motor is cont

The present invention provides method and apparatus to control a plurality of DC motors each having an encoder by a sole microcomputer. The actual rotating speed of each DC motor is detected in response to the signal from the encoder. A pulse width of a voltage which is applied to each motor is controlled due to the deviation between the actual speed and a preset speed. The output signals from the encoders regarding a specific DC motor to the other DC motor are sequentially selected by a selection signal, thereby controlling the speed measurements and calculations regarding a plurality of DC motors and the duties of electric powers which are applied to the DC motors.

대표청구항 ▼

A method of controlling rotational speed of a plurality of DC motors in a speed controlling apparatus having a whole control unit comprising: a plurality of DC motors; speed detecting apparatuses each of which is connected to each of said DC motors so as to output a pulse signal representative to th

A method of controlling rotational speed of a plurality of DC motors in a speed controlling apparatus having a whole control unit comprising: a plurality of DC motors; speed detecting apparatuses each of which is connected to each of said DC motors so as to output a pulse signal representative to the rotation of each of said motors; a data selector which selects one of said pulse signals from said speed detecting apparatuses and outputs an interruption signal, wherein the pulse signal of each of said speed detecting apparatuses is only supplied to the whole control unit via said data selector; a plurality of driving apparatuses, the method including calculating in the whole control unit a duty corresponding to a current supplying time to said DC motor while measuring the speed of said DC motor on the basis of the period of said pulse signal from said speed detecting apparatus, and controlling the rotating speed of said DC motor in accordance therewith.