Pacific Scientific R43HCNA-R2-NS-VS-00 | AC Servo Motor | Resolver Feedback for Industrial Automation

Key Technical Specifications

Available product records identify R43HCNA-R2-NS-VS-00 as a Pacific Scientific R-series AC servo motor with a 4.25-inch frame, 3-inch stack, H winding, NEMA-face mounting, no brake, and a size 21 frameless resolver.

The motor is also reported with approximately 3.7 Nm continuous torque, 3000 RPM, and a 320 VDC electrical rating. These electrical figures should be checked against the original motor nameplate and drive documentation before procurement because servo-motor ratings are configuration-dependent.

R43HCNA-R2-NS-VS-00

Product Introduction

Pacific Scientific R43HCNA-R2-NS-VS-00 Servo Motor

The Pacific Scientific R43HCNA-R2-NS-VS-00 is a brushless AC servo motor from the R43 motor family, intended for closed-loop motion applications where controlled acceleration, deceleration, and positioning are required. Its configuration combines a Samarium Cobalt permanent-magnet rotor, Class H winding, NEMA-face mounting, and a size 21 frameless resolver for primary feedback.

The important point for maintenance teams is the feedback and mechanical configuration. This is not simply a generic 4-inch servo motor. The resolver, shaft mounting, absence of a holding brake, and Viton shaft seal all affect interchangeability with the existing machine.

Application Scenarios & Field Pitfalls

Engineering Pain Point

When an older servo axis starts hunting, losing position, or generating feedback faults, the motor itself is not automatically the culprit. Resolver wiring, feedback excitation, drive parameters, coupling alignment, and mechanical load should be checked before condemning the motor. With the R43HCNA-R2-NS-VS-00, the size 21 frameless resolver is particularly important because a replacement motor with a different feedback arrangement may be mechanically suitable but electrically unusable with the installed drive.

Typical Applications

• Machine Tools — rotary axis positioning, feed drives, and coordinated machining axes.
• Packaging Machinery — indexing, cutting, forming, and synchronized motion.
• Material Handling — conveyor positioning, transfer mechanisms, and controlled acceleration.
• Industrial Automation — closed-loop actuator systems requiring resolver-based feedback.

Technical Pitfalls to Avoid

1. Do not match the motor by frame size alone.
   The R43HCNA configuration specifies a NEMA-face mounting arrangement, H winding, no holding brake, and a particular resolver configuration. Those details determine whether the motor can actually replace the installed unit.
2. Check resolver compatibility before powering the axis.
   The primary feedback is a size 21 frameless resolver, transmitter type. A motor using encoder feedback is not automatically an acceptable substitute, even when the shaft and mounting dimensions appear identical.
3. Confirm the drive’s electrical parameters.
   Available records associate this model with approximately 3.7 Nm continuous torque, 3000 RPM, and 320 VDC. Treat those values as identification data, not a substitute for the original motor datasheet or nameplate.
4. Remember that this version has no holding brake.
   If the machine axis depends on a brake for vertical-load holding or safe stopping, this specific motor configuration requires additional consideration.
5. Inspect the shaft seal and mechanical coupling.
   The specified Viton shaft seal is part of this configuration. Also check coupling condition and shaft alignment when replacing a motor; resolver feedback faults can be caused by mechanical problems rather than electronics alone.

Related Products

• Pacific Scientific R43HCNA-R2-N5-V5-00 — A related R43 motor configuration with different feedback coding. It may share the general R43 mechanical family but should not be treated as a direct electrical replacement without checking the feedback and drive configuration.
• Pacific Scientific R43HEAA-R2-NS-VS-00 — R43-family servo motor with English shaft/mounting configuration rather than the NEMA-face configuration of the R43HCNA. It is relevant where the machine’s mechanical interface requires the corresponding mounting arrangement.
• Pacific Scientific R43HEBA-R2-NS-VS-00 — Another R43-series configuration with different motor coding. Useful for comparison when identifying an existing R43 motor, but the complete part number must be matched before substitution.
• Pacific Scientific E32NCHA-LNN-NS-00 — A different Pacific Scientific brushless servo-motor family. It can be considered where a machine redesign permits a different motor configuration; it is not a drop-in substitute for the R43HCNA.
• Pacific Scientific H32NCHA-LNN-NS-00 — H-series brushless motor configuration intended for applications requiring different mechanical and electrical characteristics. It should be evaluated as an application alternative rather than a direct replacement.
• Pacific Scientific R-Series Servomotors — The broader R-series family contains multiple frame, winding, feedback, shaft, and brake configurations. Comparing the complete ordering code is essential when sourcing a legacy replacement.
• Pacific Scientific Servo Drive — The compatible drive must match the motor’s voltage, current, resolver feedback, speed, and torque requirements. The motor should not be selected independently of the drive.

Procurement note: The safest identification is the complete R43HCNA-R2-NS-VS-00 code, not simply “R43” or “.” The available records consistently identify it as a Pacific Scientific R43-series brushless servo motor with NEMA-face mounting, H winding, no brake, and size 21 frameless resolver feedback.

For a replacement on an operating machine, verify nameplate voltage/current, continuous and peak torque, resolver compatibility, shaft dimensions, mounting pattern, brake requirement, and drive parameters before installation.