Product Description:

The U508-012S18 is a compact motion actuator built by Sanyo Denki as part of the Super DC Servo Motors series. As a brushed DC servo motor, it contains field magnets, an armature winding, and an integrated shaft encoder assembled in a single frame. The design allows closed-loop velocity and position regulation when paired with a servo amplifier, making the device suitable for small gantries, laboratory instruments, and semiconductor tooling where limited space demands high power density and precise, repeatable axis control.

The integrated encoder delivers a resolution of 1000 P/R, meaning the feedback circuit receives one thousand quadrature pulses for every mechanical revolution. With 3 independent channels, the encoder supplies A, B, and index signals that allow both incremental counting and homing routines. Each channel switches through an open-collector transistor stage, so external pull-up resistors must be provided on the drive input. Logic power is drawn from a 5 V DC ±5% source, ensuring the photodiodes and driver gates operate within TTL thresholds. Because the motor is classified as a DC servo motor, current direction and magnitude directly control shaft motion, permitting rapid reversal without commutation lag.

Continuous mechanical output is rated at 80 W, allowing the motor to move light loads with reserve capacity for acceleration. The encoder transitions follow a square-wave profile, providing consistent pulse widths that simplify digital timing in the controller. Position sensing is handled by an optical shaft encoder, in which a code disk interrupts infrared beams to create low-jitter feedback suitable for precise servo tuning. The encoder channels provide the controller with the directional and reference information needed to track shaft movement, while the motor responds to changes in commanded current. This arrangement places the feedback device in the same compact frame as the motor, reducing the space required for a closed-loop motion axis.