S21HNNA-RNNE-00

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The S21HNNA-RNNE-00 motor offers a continuous stall torque of 0.5 Nm, a peak torque of 1.36 Nm, a NEMA 23 frame size, and weighs 1.4 kilograms. Part of the S Brushless Motors series by Pacific Scientific, it features a size 21 frameless resolver for primary feedback.

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Product Description:

The S21HNNA-RNNE-00 is a magnet-excited motor built by Pacific Scientific for industrial applications. Its 6-pole Neodymium design optimizes torque density and dynamic response, allowing the motor to excel in dynamic tasks that require responsive operation. This motor is designed to provide consistent speed control and modulated torque to suit a wide range of motion control tasks. Its compact form factor allows for integration into diverse system layouts while still maintaining high-performance capabilities.

The S21HNNA-RNNE-00 delivers a continuous stall torque of 0.5 Nm, which allows it to maintain stability under low-speed or standstill operations. This ensures controlled movements under load such as in tensioning systems or precision alignment equipment. It is also equipped to handle intermittent periods of high loads effectively with a peak torque capacity of 1.36 Nm. This allows the motor to output elevated rotational force for short durations to handle rapid acceleration phases or sudden load fluctuations. This allows the motor to support both peak and nominal operations, without losing stability or excessive wear. This motor has a NEMA 23 frame size which is designed to offer both flexibility and convenience in deployment across diverse motion control environments.

The S21HNNA-RNNE-00 is equipped with a size 21 frameless resolver, which serves as a robust feedback device for precise motor control. Unlike encoders, the frameless resolver is exceptionally durable and immune to dust, oil and vibration. This makes it ideal for use in harsh industrial environments, ensuring reliable and long-lasting performance in various industrial settings. The size 21 designation offers a compact yet reliable form factor that integrates easily within the motor housing without increasing its overall dimensions. This enhances the motor’s ability to integrate even in smaller installations.

Continuous Stall Torque
0.5 Nm
Inductance (line-to-line)
3.7 mH
Motor Weight
1.4 kg
Mounting Standard
NEMA Frame
Nema Frame Size
NEMA 23
Peak Torque
1.36 Nm
Primary Feedback Device
Size 21 frameless resolver
Resistance (line-to-line)
3.0 Ohms
Rotor Inertia
0.042 kgm^2 x10^-3
Secondary Feedback Device
No secondary feedback
Shaft Seal
No shaft seal
Stack Length
1 Stack
Termination Style
Interconnection Connectors
Torque Constant
0.2 Nm/ARMS
  • S21-HNNA-RNNE-00
  • S21HNNA RNNE 00
  • S21HNNA-RNNE-OO
  • S21HNNARNNE00

Frequently Asked Questions about S21HNNA-RNNE-00:

Q: What is the continuous stall torque of the S21HNNA-RNNE-00?

A: The S21HNNA-RNNE-00 has a continuous stall torque of 0.5 Nm, which enables the motor to maintain stable torque output during holding or stall conditions.

Q: What is the peak torque rating of the S21HNNA-RNNE-00?

A: The S21HNNA-RNNE-00 provides a peak torque of 1.36 Nm, allowing it to handle momentary overloads or high acceleration demands without damage.

Q: What frame size does the S21HNNA-RNNE-00 use?

A: The S21HNNA-RNNE-00 is built with a NEMA 23 frame size, making it compatible with a wide range of standard industrial equipment and simplifying installation.

Q: What type of resolver is used in the S21HNNA-RNNE-00?

A: The S21HNNA-RNNE-00 is equipped with a size 21 frameless resolver, which offers robust position feedback and enhances motion control accuracy.

Q: What type of feedback interface is available in the S21HNNA-RNNE-00?

A: The S21HNNA-RNNE-00 includes an analog resolver interface, offering stable position feedback even in electrically noisy environments.


Internal Product Review

  • ‘‘The S21HNNA-RNNE-00 offers smooth and precise performance in compact industrial systems, especially where space is limited. The rugged resolver feedback is reliable even in tough environments. A minor drawback is that integration with some digital-only control systems may require additional signal conditioning.’’

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