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Servo motor apparatus

  • US 4,258,301 A
  • Filed: 10/13/1978
  • Issued: 03/24/1981
  • Est. Priority Date: 10/21/1977
  • Status: Expired due to Term
First Claim
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1. 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.

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