Product Description:

The PBM423FHMK30-M is a geared servo motor manufactured by Sanyo Denki for the PB SANMOTION Servo Motors series. The unit combines a 42 mm class brushless rotor, an incremental encoder, and a built-in harmonic reducer to deliver precise rotary positioning at reduced speed. This configuration is suitable for small indexing tables, vision inspection platters, and compact grippers that require closed-loop motion.

The drive train has an allowable torque of 5 N·m, which is the maximum continuous load that can be applied to the output shaft without shortening its service life. Pulleys or pinions mounted on the keyed shaft may impose radial forces up to 275 N, while axial mechanisms such as ball screws may apply a thrust load as high as 1150 N. A harmonic reducer with a gear ratio of 1:100 multiplies motor torque and limits the flange speed to an allowable 35 rpm, supporting direct coupling to slow-moving production stages. Closed-loop feedback is provided by an incremental encoder with a resolution of 16000 P/R, enabling fine command steps and accurate velocity monitoring for servo drives that interpolate sub-pulse positions.

Directional repeatability is supported by a hysteresis of 2.4 arcmin, so lost motion during direction changes remains minimal for tasks such as precise component alignment. The square mounting register follows a 42 mm flange pattern, and the assembly has a length of 95.1 mm for integration in confined enclosures. The total mass is 0.54 kg, reducing the payload placed on linear axes that carry the motor. The enclosure has an IP40 protection rating, providing guarded access to internal parts when the motor is installed inside a cabinet. A keyed output shaft and low rotor inertia of 0.068 × 10⁻⁴ kg·m² help the servo settle quickly after rapid indexing. The harmonic reducer also minimizes backlash during reversing movements, supporting accurate positioning when the commanded direction changes frequently.