초록 ▼

A motor speed control system comprises an encoder (12) which produces a series of indicator pulses related to the motor\s speed. The period of the pulse is compared with that of a crystal-controlled reference period produced by a period generator (14). Comparison is made by means of a period compara

A motor speed control system comprises an encoder (12) which produces a series of indicator pulses related to the motor\s speed. The period of the pulse is compared with that of a crystal-controlled reference period produced by a period generator (14). Comparison is made by means of a period comparator (16) consisting of logic elements, including flip-flops (F1, F2, F3) and gates (G1 and G2). Digital outputs of the period comparator control UP and DOWN charge pumps whose integrated value controls the motor through a power driver. Advantages of the system are precise digital control with crystal accuracy.

대표청구항 ▼

A motor speed control system comprising: a motor; encoding means connected to said motor for generating indicator pulses related to rotational speed of said motor; period generator means comprising at least one counter which is initiated by said encoder means and generates a reference pulse period;

A motor speed control system comprising: a motor; encoding means connected to said motor for generating indicator pulses related to rotational speed of said motor; period generator means comprising at least one counter which is initiated by said encoder means and generates a reference pulse period; a period comparator connected to said encoder means and to said period generator means, said period comparator having means for comparing said reference period to a period of said indicator pulses of said encoder and for producing an output signal as a result of the comparison, said period comparator having resetting means which resets said period comparator in response to said output signal; digital-to-analog converter means having an input and an output, said period comparator being connected to said input of said converter means; and motor driver means responsive to the output signal of said converter means for controlling the speed of said motor, said driver means having an input and an output, said output of said driver means being connected to said motor.