33VM62-009-4 Pacific Scientific
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The Pacific Scientific 33VM62-009-4 is a PMDC servomotor from the Low Inertia PMDC Servomotors series. This model uses carbon brushes for commutation and features a hollow rotor construction. It has a peak torque capability of five times its rated torque and comes with an optical encoder.
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Product Description:
The 33VM62-009-4 belongs to the Low Inertia PMDC Servomotors series produced by Pacific Scientific. It is a permanent-magnet direct-current servo motor intended for positioning and speed-regulated axes in industrial automation. Its lightweight rotating assembly supports rapid acceleration and deceleration during repetitive machine cycles. The motor can be paired with a suitable drive to regulate torque and shaft speed in applications such as material-handling equipment, positioning tables, and automated assembly systems.
The motor is classified as a PMDC servomotor, meaning torque is generated by a permanent-magnet stator rather than an excited field winding. This arrangement eliminates the electrical losses associated with supplying power to a separate field winding. Mechanical commutation is accomplished through carbon brushes, and the soft brush compound helps reduce contact resistance while limiting electrical noise. During transient demand, the shaft can deliver up to five times the rated torque, allowing the drive to provide short bursts of acceleration without increasing the motor’s continuous rating. The motor uses a hollow rotor that removes unnecessary core material from the rotating assembly. This design lowers rotational inertia and improves the motor’s response to changing current commands.
No auxiliary velocity sensor is installed, so the motor has no analog tachometer for supplying speed feedback to the drive. Thermal management relies on surface convection because the unit has no forced-air cooling. Installations operating under continuous high loads must therefore provide adequate airflow around the motor housing. Position feedback can be supplied by an external optical encoder, allowing the encoder resolution and interface to be matched to the connected controller. The magnetic circuit contains no rotating iron, which helps prevent eddy-current drag and further reduces rotational inertia. Because the rotating assembly stores little magnetic energy, stable incoming power supports smooth torque production during changes in speed or load.
