33VM62-101-5 Pacific Scientific
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The Pacific Scientific 33VM62-101-5 is part of the Low Inertia PMDC Servomotors series and features a type 1 cooling system with 16.2 SCFM airflow. It includes a single-channel optical encoder with LED light source and sine signal output, operating at 5 Vdc with a maximum 150 mA current.
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Product Description:
The 33VM62-101-5 direct-current servomotor is produced by Pacific Scientific for the Low Inertia PMDC Servomotors series. As a compact permanent-magnet unit, it is intended for automation tasks that call for quick acceleration and precise velocity control while keeping the overall moving mass low. Integrated optical position feedback lets motion controllers monitor the shaft angle directly, eliminating the need for a separate encoder and simplifying small gantries, pick-and-place heads, or light conveyor stations.
This motor uses Type 1 cooling, with ambient air drawn over the frame to remove internally generated heat. Forced airflow of 16.2 SCFM across the housing maintains the winding temperature within safe limits during continuous duty. The single-ended encoder draws a maximum of 150 mA from the drive’s logic rail, so most microprocessor-based amplifiers can supply it without an auxiliary regulator. Its output is a differential sine signal that enables high-resolution interpolation in digital drive electronics, while a regulated encoder supply of 5 Vdc supports stable operation. Feedback accuracy relies on an optical sensing path, which provides consistent edge detection across a broad speed range. The encoder delivers one information track for systems that require incremental position data.
The encoder has a maximum flutter of 1.0% peak-to-peak, keeping jitter low for tighter velocity loops. Rotor-mounted feedback adds negligible reflected mass because the encoder inertia remains below 0.00001 oz-in-s². This low inertia helps preserve servo stiffness during rapid changes in speed or direction. Illumination for the sensor comes from an integrated LED, avoiding the drift associated with incandescent emitters. The armature uses a low-torque-constant winding, allowing higher peak speeds at a given bus voltage when rapid indexing is more important than continuous stall torque. A zero-index pulse is included, enabling controllers to establish an absolute home reference at startup without external limit switches.
