PBM423DGBA20 Sanyo Denki
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The Sanyo Denki PBM423DGBA20 is a servo motor from the PB SANMOTION Servo Motors series with a 42 mm flange size and a mass of 0.48 kg. It features an optical incremental encoder with an 800 count resolution and a reduction gear ratio of 1 to 7.2. The maximum stall torque is 0.686 Newton-meters, with allowable radial and thrust loads of 20 newtons and 15 newtons, respectively.
Internal Product Review
The PBM423DGBA20 is a Sanyo Denki SANMOTION servo motor with a 1:7.2 reduction gear ratio and 0.4° backlash for controlled positioning. Optical incremental encoder feedback with 800 P/R supports clean speed monitoring and dependable indexing. A max stall torque of 0.686 N·m makes the assembly a strong option for compact precision motion duty.
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Product Description:
The PBM423DGBA20 is a geared servo motor produced by Sanyo Denki within the PB SANMOTION Servo Motors series. The unit combines a brushless motor with an integrated planetary gearbox to provide position and speed control for compact industrial axes, including small pick-and-place arms, indexing tables, and vision stages. In automation equipment, it acts as the prime mover by accepting drive commands and converting them into controlled rotary motion. The gearbox increases the usable torque available at the output shaft while allowing the motor to operate efficiently at a higher internal speed.
The gearbox has a reduction ratio of 1:7.2, so 7.2 motor revolutions produce one complete output revolution. This reduction increases the delivered torque to a maximum stall torque of 0.686 N·m. A high-resolution optical incremental encoder provides 800 P/R feedback for precise position monitoring by the connected servo drive. The output can sustain continuous rotation up to 250 rpm when the applied load remains within the permitted limits. The motor is configured for forward rotation to match the orientation of the gear set. Radial loading on the output shaft must not exceed 20 N, while the permitted axial load is 15 N to protect the bearings. Gearbox backlash is limited to 0.4 degrees, helping preserve repeatability during repeated changes in direction. Rotor inertia is 0.056 × 10⁻⁴ kg·m², supporting rapid acceleration and controlled deceleration in compact motion systems.
The complete motor and gearbox assembly has an overall length of 87.9 mm, making it suitable for machinery with limited installation depth. Its square flange measures 42 mm on each side and supports installation in compact mounting arrangements associated with this motor size. The assembly has a mass of 0.48 kg, which limits the added load when it is installed on a moving gantry or articulated mechanism. The short housing and low mass also make the unit practical for tightly spaced multi-axis equipment. Conventional differential encoder channels allow the optical incremental encoder to connect to compatible feedback inputs without an unusual interface arrangement.
