Product Description:

The PMB33C-20116-03 is a brushless servomotor built by Pacific Scientific and supplied within the PMB Brushless Servomotors series. It converts commanded electrical power into controlled rotary motion for axes that require precise speed and position regulation in industrial automation cells, packaging lines, and pick-and-place stations. This makes it suitable for indexing, transfer, and synchronized positioning tasks where repeatable motion is required. By combining a permanent-magnet rotor with electronic commutation, the unit delivers rapid acceleration while eliminating brush maintenance. It interfaces directly with digital drives that provide 240 VAC three-phase power.

Physically, the motor conforms to NEMA Size 34, so its 3.4-inch square face fits frame-34 mounting layouts. Inside, an optical encoder delivers 4096 ppr feedback, allowing the drive controller to divide each mechanical revolution into fine position increments for accurate motion control. The armature can sustain a locked-rotor current of 3.8 ARMS, which indicates the current level the winding can handle at stall. Power, signal, and phase-sense connections exit as flying leads with AMP connectors, allowing direct connection to matching harnesses while keeping the housing sealed. Commutation data is provided by a digital encoder with commutation, so the drive can align phase currents without separate Hall sensors.

The motor has a shaft seal and PTC thermistor. The shaft seal helps block contaminants at the output end, and the PTC thermistor sends temperature information to the drive for thermal protection. Torque is transmitted through a shaft with a square key, which helps prevent slip under load and supports standard hub connections. The motor uses a 3-stack lamination, which balances inertia and peak torque density within this frame size.