Product Description:

The PMA21B-10100-00 brushless servomotor is manufactured by Pacific Scientific within the PMA Brushless Motors series. As a permanent-magnet unit, it provides closed-loop rotary motion for industrial positioning stages, indexing conveyors, and moderate-inertia machine axes that require repeatable velocity control. A rear-mounted resolver supplies real-time shaft angle feedback to the drive, and the rotor couples to downstream mechanics through a closed-keyway shaft. Because the motor is supplied without a brake, holding torque must be provided by the drive or by an external locking device when power is removed.

The motor delivers a continuous stall torque of 0.63 Nm, allowing steady load support at zero speed, while short duty cycles can draw up to 2.3 Nm of peak torque for acceleration spikes. Dynamic response is supported by a rotor inertia of 0.022 × 10⁻³ kg·m², which keeps stored energy low during speed changes. The windings reach their thermal limit at a nominal stall current of 2.7 ARMS, so continuous current must remain within that value during operation. Electrical insulation supports supplies up to 240 V AC max, matching typical mid-power servo amplifiers. Stack length 1 keeps the envelope compact, and the resolver maintains commutation accuracy under vibration.

Mechanical integration benefits from the square housing dimension of 70 mm, which aligns with standard metric mounting patterns. The frame weighs only 1.7 kg, so vertical-axis loads place minimal static stress on linear guides and support hardware. Power leads terminate in a 6PP (6-Pin Power) connector, and resolver wiring exits through a matching feedback plug located alongside. With the connectors in a right-angle orientation, the motor can be mounted close to panels while preserving cable bend clearance.