33VM62-220-1 Pacific Scientific
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The Pacific Scientific 33VM62-220-1 is part of the Low Inertia PMDC Servomotors series and features a feedback type of analog tachometer with a tach constant of 2.5 V per 1000 rpm and an output resistance of 50 Ohm. The motor supports a flange diameter of 4.000 inches, a shaft diameter of 0.3745 inches, and a mounting bolt circle of 3.656 inches.
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Product Description:
The 33VM62-220-1 is a low-inertia permanent-magnet DC servomotor manufactured by Pacific Scientific within the Low Inertia PMDC Servomotors series. In automated lines it provides rapid speed changes and accurate velocity feedback for positioning tables, pick-and-place heads, and similar motion axes. The motor integrates an analog tachometer so the drive can monitor real-time shaft speed and correct any deviation through closed-loop control. Its low-inertia permanent-magnet design also supports quick reversals and responsive motion on axes that must settle rapidly between repeated moves.
The housing is dimensioned for compact machinery. A flange diameter of 4.000 in is held to a ±0.010 in tolerance, while the pilot registers at 3.312 in with a −0.001 in lower limit to center the motor on the mounting face. The armature exits through a ground-steel shaft that measures 0.3745 in in diameter and is limited to a −0.0005 in undersize to maintain bearing fit. Speed feedback is produced by the internal tachometer, which has a constant of 2.5 V/1000 rpm and a permissible variation of ±0.125 V/1000 rpm. Drive electronics see low loop impedance because the tachometer has an output resistance of 50 ohms, which helps minimize signal distortion. The tachometer section occupies a 70 mm diameter by 66 mm length envelope, and its terminals are accessed through 4-40 UNC screws.
The end bell includes a cooling tube with an outside diameter of 0.750 in so coolant can be routed beside the stator when higher duty cycles raise winding temperature. Four through-holes lie on a 3.656 in bolt circle, and each hole is tapped with 8-32 UNC threads with a minimum depth of 0.210 in to secure the frame. Motor power leads attach to 6-32 UNC screws, keeping termination hardware consistent with common industrial practice. Tachometer ripple is limited to 1.5% peak-to-peak, which helps maintain a stable feedback voltage during rapid accelerations and decelerations. This arrangement supports smooth speed monitoring when the axis changes direction frequently or runs through short repetitive cycles.
