PBM423DHLA20 Sanyo Denki
Wake Industrial LLC is not an authorized distributor of this product.
The Sanyo Denki PBM423DHLA20 is part of the PB SANMOTION Servo Motors series and has a flange size of 42 mm square with a gear ratio of 1:50. This servo motor features an encoder resolution of 800 pulses per revolution and provides a maximum stall torque of 3.5 Newton-meters. The unit weighs 0.54 kilograms and supports a maximum thrust load of 1150 Newtons.
Internal Product Review
The PBM423DHLA20 is a Sanyo Denki PB SANMOTION servo motor with a 1:50 gear ratio and 800 P/R encoder resolution. Torque delivery is especially appealing, with 3.5 N·m max stall torque and 8.3 N·m instantaneous torque supporting precise geared motion.
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Product Description:
The PBM423DHLA20 is a compact geared servo unit produced by Sanyo Denki within the PB SANMOTION Servo Motors series. It is intended for precise positioning duties in small conveyors, laboratory actuators, and semiconductor tooling where controlled speed reduction and high torque are required. By combining a compact motor with an integrated planetary gearhead, the product delivers elevated stall torque at low output speed. This arrangement enables direct connection to mechanical loads without separate transmission hardware.
The gear train has a 1:50 reduction ratio, providing controlled output motion and increased torque. With an instantaneous torque capacity of 8.3 N·m, the assembly can absorb transient acceleration commands without exceeding its mechanical limits. Continuous loading is governed by a maximum stall torque of 3.5 N·m, which establishes the allowable steady-state load for drive tuning. Position feedback is delivered by an incremental encoder resolution of 800 P/R, providing detailed motion data for precise position control. The rotor inertia of 0.068 × 10⁻⁴ kg·m² supports rapid acceleration because the drive current does not need to overcome a large rotating mass. The allowable gearbox output speed is 70 rpm, helping control heat buildup during continuous operation. Gearhead hysteresis is limited to 2.4 arcminutes, keeping lost motion low during direction changes. A 300 mm lead is provided for connection to the amplifier.
Mechanical installation uses a square 42 mm flange that matches NEMA 17 layouts, while 4.5 mm mounting holes and a 37.6 mm pilot support concentric seating on equipment plates. The 97 mm assembly length includes the gearbox and allows the unit to fit into shallow enclosures. A hardened 10 mm shaft accepts keyed or clamp-style couplings. The shaft can tolerate a radial load of 209 N at its midpoint, supporting belt, pulley, and gear-driven applications. It also permits an axial force of up to 1150 N for thrust-bearing applications such as lead-screw drives. The complete assembly has a mass of 0.54 kg, which limits the additional weight placed on moving machine axes.
