Patent Number: 7,042,188

Title: Servo motor with a built-in drive circuit

Abstract: A servo motor with a built-in drive circuit is provided in which, when power is off, positional data including multiple-rotation counting values is stored in a nonvolatile memory to thereby eliminate battery back-up, and in which the CPU of a drive control circuit portion is in charge of the multiple-rotation counting itself to thereby eliminate the circuit for multiple-rotation counting. Due to a reduction in the number of lines involved and an elimination of battery back-up, a reduction in size is achieved. The servo motor with a built-in drive circuit includes an absolute encoder for detecting rotation of a servo motor portion and an electromagnetic mechanical brake, in which, when the power is off, the positional data at that time is stored in a nonvolatile memory.

Inventors: Miura; Hiromasa (Nagano-ken, JP), Noda; Toshiyuki (Nagano-ken, JP)

Assignee: Tamagawa Seiki Kabushiki Kaisha

International Classification: G05B 1/06 (20060101)

Expiration Date: 5/09/02018