S21GNNA-NSVS-03
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The Pacific Scientific S21GNNA-NSVS-03 is a 6-pole Neodymium magnet brushless servo motor from the S Brushless Motors series. It has a continuous stall current of 1.5 A RMS and a typical rated speed of 7900 RPM. The motor weighs 1.4 kg and features a NEMA 23 frame size with Viton shaft seal and a stack length of 1.
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Product Description:
The S21GNNA-NSVS-03 servo motor is produced by Pacific Scientific within the S Brushless Motors series. This 6-pole Neodymium magnet brushless unit is intended for position and velocity control in compact industrial axes and light robotics. It follows the NEMA frame mounting convention and fits the NEMA 23 size, so it installs directly on standard brackets. Delivered without a holding brake, it relies on drive torque or external locks for power-off retention, and it is supplied without a primary feedback device, letting the designer specify an external encoder when closed-loop accuracy is required.
The motor supplies a continuous stall torque of 0.5 Nm while drawing a continuous stall current of 1.5 A RMS. For short overloads, peak torque reaches 1.36 Nm and the drive may command up to 4.5 A RMS. The electromagnetic design yields a torque constant of 0.3 Nm/ARMS, defining the relationship between phase current and developed torque. Static friction tops out at 0.008 Nm, and viscous damping is 0.003 Nm/kRPM, so speed regulation error remains low under light process loads. Typical rated speed is 7900 RPM, matching high-throughput pick-and-place requirements, and the single-section construction (1 stack) keeps overall length short. The NEMA frame mounting combined with winding type G offers a balance between phase resistance and thermal loading for systems powered from low-to-mid-range servo drives.
Line-to-line inductance is 14.4 mH and resistance is 12.0 Ohms, parameters that influence current ripple and drive voltage selection. Rotor inertia of 0.042 ×10⁻³ kg·m² allows fast acceleration with modest controller gains, while the motor weight is 1.4 kg, easing integration on moving gantries. Thermal behavior is assisted by a thermal resistance of 2.2 °C/W and a thermal time constant of 5.0 min, permitting brief overloads without excessive winding temperature rise. The Viton shaft seal protects the front bearing from coolant splash and dust, and a voltage constant of 0.19 VRMS/rad/sec helps the servo amplifier estimate back-EMF for commutation.
Frequently Asked Questions about S21GNNA-NSVS-03:
Q: What mounting standard does the S21GNNA-NSVS-03 motor use and what is its frame size?
A: The S21GNNA-NSVS-03 servo motor utilizes a NEMA 23 frame size for mounting, conforming to NEMA standards.
Q: What is the continuous stall torque rating for the S21GNNA-NSVS-03 brushless servo motor?
A: This motor provides a continuous stall torque output of 0.5 Nm.
Q: Does the S21GNNA-NSVS-03 brushless motor come equipped with a holding brake?
A: There is no holding brake included on the S21GNNA-NSVS-03 model.
Q: What type of shaft seal is used with the S21GNNA-NSVS-03 motor?
A: A Viton shaft seal is provided on this motor for shaft protection.
Q: What is the typical rated speed of the S21GNNA-NSVS-03 servo motor?
A: The typical rated speed of this motor is 7900 RPM in operation.
