Tamagawa Seiki Kabushiki Kaisha

Tomio Nakata

Kenji Shiroshita

Tsuneo Sugiura

In an encoder output method and a servo motor encoder according to the present invention, the number of signal lines is reduced by using common signal lines and common output terminals. In the encoder output method and the servo motor encoder, incremental signals (A, B, Z) and servo motor magnetic pole position detection signals (UE, VE, WE) are switchably output by a common driver (2) through a pair of timers and a multiplexer (30), or a pair of timers and two line drivers (60, 70) are selectively active or inactive, and common signal lines are used, thereby reducing the number of signal lines.

Encoder output method and servo motor encoder

The invention provides a servo motor encoder in which signals are output via signal lines and output terminals which are used in common. Incremental signals A, B, and Z and servo motor magnetic pole position detection signals UE, VE, and WE are switched by a multiplexer so as to output these signals via a common line driver. Alternatively, two line drivers are selectively activated and inactivated so that incremental signals and servo motor magnetic pole position detection signals are output via common signal lines. In any modes, signals can be carried via a less number of signal lines.

Servo motor encoder

A brushless direct current electric motor includes a casing, a stator and a plurality of driving coils disposed within the casing, and a rotor having a plurality of alternating north and south magnetic poles formed on its periphery, with the rotor being disposed for rotation within the casing. The stator is composed of plural stator elements, with driving coils wound separately on respective insulated stator elements.

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Iida, Japan

Tomio Nakata