Description
Harmonic Drive FHA-32C-50-H-C1024-SP | AC Servo Actuator
Dynamic Product Introduction
The FHA-32C-50-H-C1024-SP is not simply a harmonic gearbox with a motor bolted onto it. It is an integrated FHA-C servo actuator designed around Harmonic Drive’s precision gearing, brushless motor, hollow output shaft, output bearing, and encoder feedback. The hollow shaft allows cables, tubing, or other services to pass through the center of the rotating axis.
The 32C frame combined with a 50:1 reduction gives this version substantially more torque capacity than the smaller FHA-17C configuration. Harmonic Drive’s published FHA-C data gives the 32C/50 configuration a 281 N·m maximum torque, 60 N·m continuous torque, and 80 rpm maximum speed under the stated rating conditions. These are actuator-family ratings, not a blanket guarantee for every duty cycle or application.
The final SP suffix deserves special attention. Harmonic Drive defines SP as a special specification code, meaning the complete unit should be matched against the original machine documentation rather than treated as an ordinary catalog-standard actuator.
FHA-32C-50-H-C1024-SP
Model-Code Breakdown
FHA – 32C – 50 – H – C1024 – SP
- FHA — FHA-C AC servo actuator family
- 32C — size 32C
- 50 — 50:1 reduction ratio
- H — high-voltage motor winding
- C1024 — incremental encoder
- SP — special specification / customer-specific configuration
For the H winding, Harmonic Drive specifies a maximum DC bus voltage of 680 VDC. The C1024 feedback option is identified as an incremental encoder with no digital protocol specified in the ordering table.
Key Technical Specifications
- Manufacturer: Harmonic Drive
- Series: FHA-C
- Exact Model: FHA-32C-50-H-C1024-SP
- Actuator Type: AC servo actuator
- Design: Hollow-shaft
- Frame Size: 32C
- Gear Ratio: 50:1
- Motor Winding: H
- Maximum DC Bus Voltage: 680 VDC
- Motor Feedback: C1024 incremental encoder
- Maximum Torque: 281 N·m
- Continuous Torque: 60 N·m
- Maximum Output Speed: 80 rpm
- Backlash: Zero-backlash design
- Special Configuration: SP
The published 32C/50 ratings are 281 N·m maximum torque, 60 N·m continuous torque, and 80 rpm maximum speed. Harmonic Drive also identifies the FHA-C family as a zero-backlash actuator design.
Important Qualification on the SP Suffix
Do not assume that every FHA-32C-50-H-C1024-SP has identical mechanical or electrical details beyond the base ordering code.
Harmonic Drive’s engineering table defines SP as a special design according to customer requirements. That means the original equipment drawing, factory configuration record, or nameplate should be used to establish any additional special characteristics.
For procurement, this is one of the cases where the complete part number is more important than the generic family name.
Feedback Configuration
The C1024 suffix identifies an incremental encoder.
Harmonic Drive’s engineering documentation distinguishes it from other FHA-C feedback options:
- C1024: Incremental
- M512P: Multi-turn absolute, EnDat
- M128P: Multi-turn absolute, HIPERFACE
- D250: Incremental
- US250: Incremental
The option therefore should not be casually replaced with an absolute-feedback actuator merely because the mechanical frame and reduction ratio are identical.
Mechanical Performance
For the FHA-32C-50 configuration, Harmonic Drive publishes:
- Reduction ratio: 50:1
- Maximum torque: 281 N·m
- Continuous torque: 60 N·m
- Maximum speed: 80 rpm
- Maximum current: 11.4 A RMS in the published FHA-C H-series data
The published ratings are engineering reference values. Actual allowable torque and speed depend on operating conditions, duty cycle, temperature, acceleration, load inertia, and the selected drive.
The 50:1 reduction also means that this actuator is intended for high-reduction, precision rotary motion rather than high-speed direct-drive applications.
Hollow-Shaft Architecture
The FHA-C’s hollow shaft is one of its defining mechanical features.
Harmonic Drive describes the center through-hole as suitable for routing:
- Motor/encoder wiring
- Pneumatic tubing
- Process tubing
- Optical or laser paths
- Other services through the axis of rotation
This can substantially simplify rotary-axis packaging compared with a conventional solid-shaft motor and external gearbox arrangement.
The integrated output bearing is another reason not to classify this unit simply as a gear reducer. The FHA-C is engineered as a complete rotary actuator.
Global Sourcing & Live-Test SOP
1. Inbound Verification
For FHA-32C-50-H-C1024-SP, verify every portion of the nameplate:
- FHA designation
- 32C frame
- 50 reduction ratio
- H winding
- encoder
- SP special specification
- Serial number
- Manufacturing information
Photograph the label before cleaning or repackaging.
A partial identification such as “FHA-32C” is not sufficient for a replacement procurement.
2. Mechanical Inspection
Inspect:
- Hollow output shaft
- Output bearing
- Mounting surfaces
- Pilot diameter
- Housing
- Connector(s)
- Motor cable
- Encoder cable
- Shaft rotation
- Evidence of impact
- Oil/grease leakage
- Previous repair marks
Do not force the output shaft through abnormal resistance. A precision harmonic actuator can be damaged by improper mechanical handling.
3. Electrical Verification
Before applying power, match the actuator to the intended servo amplifier.
Verify:
- H winding configuration
- encoder
- Motor phase wiring
- Encoder wiring
- Drive voltage compatibility
- Drive current parameters
- Correct actuator configuration in the amplifier
The H winding is rated for a maximum DC bus voltage of 680 VDC according to Harmonic Drive’s engineering documentation. This is a high-voltage servo configuration and should not be treated like a low-voltage motor.
4. Functional Test
Where the correct drive and test fixture are available, verify:
- Servo initialization
- Encoder feedback
- Correct phase sequence
- Forward/reverse rotation
- Low-speed operation
- Position feedback
- Abnormal mechanical noise
- Vibration
- Drive alarms
- Encoder fault behavior
A no-load power-up should be reported as a basic electrical/functional check, not as proof that the actuator has passed its rated torque or speed performance.
5. Final Preparation
Before shipment:
- Record the complete designation.
- Record serial number.
- Photograph connectors and output shaft.
- Protect encoder and motor connectors.
- Protect the hollow shaft from contamination.
- Use shock-resistant packaging.
- Preserve any factory labels indicating the SP configuration.
Field Engineer’s Pitfall Guide
❗ 1. Do Not Lose the “SP”
The SP suffix is not decorative.
Harmonic Drive defines SP as a special specification according to customer requirements. Removing it from the procurement description can result in a superficially similar standard actuator being supplied instead of the machine-specific unit.
For a critical replacement, the complete ordering code should remain:
❗ 2. Is Incremental Feedback
Do not substitute an EnDat or HIPERFACE encoder configuration simply because the actuator has the same 32C frame and 50:1 reduction.
The feedback electronics are part of the actuator configuration. Harmonic Drive explicitly separates , M512P, M128P, D250, and US250 in its ordering table.
