S21GSAA-RNNM-02
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The S21GSAA-RNNM-02 motor from Pacific Scientific is a compact unit weighing 1.4 kilograms with a continuous stall torque of 0.5 Nm. As part of the S Brushless Motors series, it features a NEMA 23 frame size and a size 21 frameless resolver as its primary feedback device. The motor boasts a peak torque of 1.36 Nm.
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Product Description:
A tiny brushless servo motor of the S series, the Pacific Scientific S21GSAA-RNNM-02 has been developed with a balance between mechanical simplicity and control accuracy.
It can be placed in many different setups, as the motor has a standard NEMA 23 frame size. Its dimension is ideal as it weighs 1.4kg, which is favorable to space-constrained and weight-sensitive automation systems. The continuous stall torque is 0.5 Nm, which proves to be stable even with a load. It also has a peak torque of 1.36 Nm, thus able to handle short, high loads in high-motion applications. The torque constant is higher than other motors of this type at 0.3 Nm/ARMS, so it can give higher torque per amp-useful where lower current is required or where improved thermal performance is required. The voltage constant is 0.19VRMS/Rad/Sec, and thus can be correctly applied in speed control. In high-frequency applications, this model's exceptionally large (electrically) line-to-line inductance of 14.4 mH and resistance of 12.0 ohms slow down operation while smoothing the transition. With values of 0.042 x 10⁻³ kg·m², the rotor's inertia is minimal, and the single stack design keeps it lightweight and maneuverable.
The motor itself has a frameless Size 21 resolver as its main feedback device, and is both rugged and reliable in high-temperature position sensing applications. Secondary feedback is not available, and therefore, systems with large resolution encoders may require external supplements. The motor has no shaft seal as well, and this can be a restricting feature when used within a dusty or fluid environment. It is terminated through a motor-mount MS connector and thus has an easy electrical connection. The wind type is identified as G, which follows the typical performance values of this family of motors.
Frequently Asked Questions about S21GSAA-RNNM-02:
Q: What is the torque performance of the S21GSAA-RNNM-02?
A: The S21GSAA-RNNM-02 provides 0.5 Nm of continuous stall torque and 1.36 Nm at peak, delivering dependable performance for moderate dynamic loads and short bursts.
Q: How does the S21GSAA-RNNM-02 handle electrical efficiency and control?
A: It has a torque constant of 0.3 Nm/ARMS and a voltage constant of 0.19 VRMS/rad/sec, making it well-suited for precise torque output and stable speed control with lower current draw.
Q: What kind of feedback system is built into the S21GSAA-RNNM-02?
A: The motor features a frameless Size 21 resolver, which is rugged and suitable for high-temperature or vibration-prone environments but does not provide high-resolution feedback like digital encoders.
Q: Is the S21GSAA-RNNM-02 sealed against dust or fluids?
A: No, the S21GSAA-RNNM-02 does not include a shaft seal, which makes it less suitable for dirty or fluid-exposed environments without additional protection.
Q: What are the installation features of the S21GSAA-RNNM-02?
A: It uses a standard NEMA 23 frame, weighs just 1.4 kg, and is equipped with an MS-style motor-mounted connector for quick and simple electrical integration.
