초록 ▼

A theoretically optimum motor drive time period or drive pulse width is computed as a function of the number of steps from the present motor shaft position to the desired command position and the present motor shaft rotational speed. A compensation factor is computed as a function of the present mot

A theoretically optimum motor drive time period or drive pulse width is computed as a function of the number of steps from the present motor shaft position to the desired command position and the present motor shaft rotational speed. A compensation factor is computed as a function of the present motor shaft speed and the torque-speed characteristic of the motor (12) and multiplied by the computed drive time period to produce a present drive time period for energization of the motor (12) for rotation of the motor shaft (14) from the present position to the next step position. After the motor shaft (14) has been rotated to within one step of the command position, sensor means (18′) sense displacement of the motor shaft (14) in excess of a predetermined small angular distance from the command position and cause the motor (12) to be energized to rotate the motor shaft (14) toward the command position.

대표청구항 ▼

A servo motor apparatus including a servo motor having a shaft and drive means for energizing the motor to rotate the shaft, characterized by comprising: sensor means for sensing displacement of the shaft from the command position; first control means for controlling the drive means to energize the

A servo motor apparatus including a servo motor having a shaft and drive means for energizing the motor to rotate the shaft, characterized by comprising: sensor means for sensing displacement of the shaft from the command position; first control means for controlling the drive means to energize the motor to rotate the shaft from an initial position toward the command position; and second control means for controlling the drive means to energize the motor to rotate the shaft toward the command position when the sensor means senses displacement from the command position in excess of a first predetermined distance; the sensor means being constructed to actuate only the first control means when the shaft is between the initial position and a second predetermined distance from the command position and to actuate only the second control means when the shaft is within the second predetermined distance from the command position, the second predetermined distance being larger than the first predetermined distance.