PMA43J-1050B-08 Pacific Scientific
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Pacific Scientific PMA43J-1050B-08 is part of the PMA Brushless Motors series and is classified as a brushless servomotor with a 115 mm motor body square and a stack length of 3. This motor has a continuous stall torque of 6.1 Nm, a peak torque of 21.7 Nm, and a rotor inertia of 0.52 kgm^2 x 10^-3. Its shaft type is a closed keyway with key fitted, it does not include a brake, and it weighs 7.6 kg.
Internal Product Review
The PMA43J-1050B-08 is a Pacific Scientific PMA brushless servomotor rated for 6.1 Nm continuous stall torque and 21.7 Nm peak torque. A closed keyway shaft with fitted key and rotor inertia of 0.52 kgm^2 x 10^-3 give the motor strong coupling stability and responsive servo performance.
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Product Description:
The PMA43J-1050B-08 is a brushless servomotor manufactured by Pacific Scientific as part of the PMA Brushless Motors series. It provides rotary motion for industrial automation axes where precise speed and position control are required in packaging, material-handling, and process equipment. The motor receives three-phase power from a matched amplifier and uses an internal permanent-magnet rotor to develop torque without brush maintenance. Its compact housing allows it to fit into machines that need high torque from a moderate-size frame. This arrangement supports smooth closed-loop motion during repeated starts, stops, and speed changes.
Its continuous stall torque is 6.1 Nm, which means the stator can sustain that load continuously while remaining within rated temperature limits. The square aluminum housing measures 115 mm on each side, which sets the mounting footprint and affects enclosure spacing. During acceleration or short overloads, the motor can supply up to 21.7 Nm of peak torque, giving the axis additional headroom for rapid index moves. Rotor inertia is rated at 0.52 kgm^2 x 10^-3, which helps the servo system respond quickly with moderate gain settings and minimal overshoot. The active lamination stack uses length code 3, balancing thermal dissipation and torque density for general-purpose motion tasks. These characteristics make the motor suitable for axes that need stable low-speed torque as well as short bursts of higher output.
For installations that use external mechanical stops or dynamic braking in the drive, the motor is supplied with no brake, which reduces overall length and mechanical complexity. Torque is delivered through a shaft with a closed keyway with a fitted key, providing repeatable coupling and secure torque transfer to the driven load. The assembly weight of 7.6 kg limits added mass on moving carriages and helps keep payload calculations straightforward. This configuration suits systems that rely on the drive or machine mechanics for holding and deceleration instead of an onboard brake.
