초록 ▼

A digital motor control positioning system, and method, are disclosed in which lead screw position is measured by an encoder, and the error between that position and the destination is measured, either continuously or repetitively, to provide digital, distance-representing control pulses to the moto

A digital motor control positioning system, and method, are disclosed in which lead screw position is measured by an encoder, and the error between that position and the destination is measured, either continuously or repetitively, to provide digital, distance-representing control pulses to the motor. In the final, settling-in portion of motor movement, it is successively started and stopped to provide incremental distance movements, which preferably are reduced in size as the destination is approached.

대표청구항 ▼

That method of causing a driven element to be moved in one direction only into its predetermined destination position by a motor which moves continuously from its energization until its deenergization, said motor having movement increments of variable magnitude, the beginning position of each moveme

That method of causing a driven element to be moved in one direction only into its predetermined destination position by a motor which moves continuously from its energization until its deenergization, said motor having movement increments of variable magnitude, the beginning position of each movement increment being determined solely by its energizing signal and the end position of each movement increment being determined solely by its deenergization plus any coasting thereafter, which method comprises: measuring the position of the driven element with a position-to-digital transducer; comparing the transducer-measured position with the destination position to determine the error distance; causing the motor to move the driven element continuously until it reaches a predetermined distance from the destination position; and thereafter causing the motor to alternately start and stop repeatedly in order to move in increments whose magnitude is controlled by the digital information from the transducer.