Harmonic Drive FHA-C Mini IDT Integrated Actuators Review: Specs, Price and Applications
Updated: 4 days ago
Harmonic Drive FHA-C Mini IDT integrates a servo drive into the compact geared actuator and communicates over CANopen. Sizes 8, 11 and 14 combine 24 VDC nominal power with separate motor-input and gear-output absolute encoders, providing a materially different integration arrangement from an FHA-C Mini that needs an external drive.
Quick Verdict
FHA-C Mini IDT is a candidate for a compact rotary mechanism where placing the drive at the axis simplifies cabinet wiring. Its strongest distinction is the integrated CANopen drive and dual absolute feedback. Select the exact size and ratio for the required load, and distinguish encoder resolution, positioning accuracy and continuous-duty capability.
Harmonic Drive FHA-C Mini IDT Integrated Actuators at a Glance
Specification | Details |
Architecture | Geared servo actuator with integrated CANopen servo drive |
Sizes and ratios | Sizes 8, 11 and 14; ratios 30:1, 50:1 and 100:1 |
Supply designation | 24 VDC nominal; exact permitted supply conditions must match the ordered unit |
FHA-8C maximum torque by ratio 30 / 50 / 100 | 1.8 / 3.3 / 4.8 Nm |
FHA-11C maximum torque by ratio 30 / 50 / 100 | 4.5 / 8.3 / 11 Nm |
FHA-14C maximum torque by ratio 30 / 50 / 100 | 9 / 18 / 28 Nm |
Maximum output speed by ratio 30 / 50 / 100 | 200 / 120 / 60 rpm; do not combine with a different ratio's torque |
Absolute feedback | 15-bit motor input; 14-bit gear output (16384 counts/revolution) |
Published one-way positioning accuracy | Size and ratio dependent: 90–150 arcsec |
Published mass by size 8 / 11 / 14 | 0.41 / 0.63 / 1.2 kg |
Design and Engineering Assessment
Moving the drive into the actuator changes both wiring and thermal design. It reduces the need for a separate amplifier near the cabinet, but the axis still needs a correctly sized DC supply, protection, grounding and a planned communication bus. Count the complete installed cabling and access space rather than comparing actuator bodies alone.
The manufacturer's four-conductor connection describes CANH, CANL, positive DC power and DC return. It is not a statement that every machine function, shield and safety circuit can be omitted. The optional I/O connector is a separate ordering choice, and protective bonding and installation requirements still follow the equipment documentation.
The two encoders observe different parts of the mechanism. The gear-output encoder provides 16384 counts per output revolution, while the motor-input encoder provides 32768 counts per motor revolution. Multiplying motor counts by the ratio produces a finer equivalent count, but does not turn the output sensor into a sensor of that resolution or establish the final axis accuracy.
Battery-free absolute recovery is explicitly described within one output revolution. A machine requiring knowledge of an unlimited multi-turn path or an external mechanism's absolute state needs a separate position-recovery strategy. Retaining the actuator angle does not automatically establish that the workpiece or machine reference remained unchanged during a power interruption.
Sizing the Exact Ratio and Load
The size-14 ratio-100 row lists 28 Nm maximum torque and 60 rpm maximum output speed. The ratio-30 row has a different torque limit and reaches 200 rpm. These are separate configurations; do not create an imaginary 28 Nm, 200 rpm actuator by combining the family maxima.
Maximum torque is not the continuous operating specification. Use the selected model's allowable current, thermal conditions and actual load cycle. Acceleration, dwell and repeated reversal can create different heating and bearing requirements even when the same maximum load appears on a drawing.
CANopen and Commissioning
The manufacturer lists torque, velocity and position control, including cyclic synchronous modes. The host must support the selected mode, device setup and fault behavior. A supported protocol name alone does not establish that an existing machine controller has the required object configuration or timing.
HDL-IDE supports commissioning through a CAN communication converter without a CANopen master. This is useful for setup and tuning, but normal machine operation still needs its intended command architecture. Verify direction, limits, current protection, fault recovery and position interpretation before applying the production load.
Connectors, Mounting and Service
PM1, PM2, PM3 and PM4 specify rear, right, left and top connector exits. Select the orientation with the complete machine layout, including bend radius, mating connector length and maintenance access. A replaceable panel-mount cable can reduce service effort only when the connector remains accessible after installation.
The output bearing and mounting structure must support the payload and its offset. Check the exact permissible moment load for the selected size and use the required mounting arrangement. Small actuator dimensions do not make a cantilevered tool load negligible.
Comparing the External-Drive FHA-C Mini
An external-drive FHA-C Mini can suit a machine that already has compatible amplifiers and established motor/feedback cabling. IDT changes that architecture to an integrated CANopen axis. Compare controller compatibility, DC distribution, cable replacement and thermal placement before deciding which arrangement simplifies the machine.
Do not transfer hollow-shaft assumptions or every encoder option from another FHA-C Mini version. Order from the integrated-drive configuration and drawing. The correct variant identity is more useful than a broad family label when approving cables or spare actuators.
Applications and Selection
Compact robot mechanisms and rotary machine axes where an integrated networked drive and absolute output-position sensing simplify the installation.
For Harmonic Drive FHA-C Mini IDT Integrated Actuators, define the actual machine duty before selecting an ordering configuration. Include the required operating point, available installation space, environment and control interfaces. The specification table describes the product or family; the surrounding machine determines which of those features matters for the intended job.
Price and Value
Price: Request a quote for the exact configuration. Compare the product, compatible control equipment, required mechanical parts, cabling and commissioning as one installed system. A component price alone does not represent the cost of a working automation axis.
Evaluate an alternative against the same duty and acceptance criteria. Match the continuous operating requirement first, then compare transient capability, feedback, mechanical fit and support. This avoids choosing between superficially similar products whose ratings describe different operating conditions.
Pros and Cons
Advantages
Integrated drive reduces the need for a separate axis amplifier
CANopen command architecture with dedicated commissioning software
Separate absolute feedback at motor input and gear output
Four connector-exit choices support installation and service planning
Limitations
Battery-free absolute claim is limited to one output revolution
Maximum torque does not establish sustained-duty capability
CANopen host and electrical distribution still need engineering
Resolution, accuracy and loaded stiffness must be evaluated separately
Who Should Consider Harmonic Drive FHA-C Mini IDT Integrated Actuators?
Consider Harmonic Drive FHA-C Mini IDT Integrated Actuators for compact robot mechanisms and rotary machine axes where an integrated networked drive and absolute output-position sensing simplify the installation. Establish the required operating point and installation interfaces before choosing the configuration, and use a representative loaded cycle as the acceptance basis.
Harmonic Drive FHA-C Mini IDT Integrated Actuators FAQ
What makes FHA-C Mini IDT different from the standard actuator?
IDT includes a servo drive inside the actuator and uses CANopen. A standard external-drive arrangement requires a separately matched amplifier. Choose the complete drive architecture rather than treating IDT as a connector-only option.
Which sizes and ratios are listed?
The integrated-drive ordering table lists sizes 8, 11 and 14 with ratios 30, 50 and 100. Select the exact size-and-ratio combination because torque, speed, current and accuracy depend on that choice.
What does the four-wire connection include?
The manufacturer identifies CANH, CANL, +24 VDC and 0 VDC. Optional I/O and installation requirements remain separate considerations. The four conductors do not remove grounding, shielding, protection or machine-safety obligations.
Does it remember its position without a battery?
The dual absolute arrangement is described as battery free within 360 degrees of output rotation. A mechanism requiring multi-turn state or an external machine coordinate needs an appropriate recovery strategy beyond that single-turn claim.
Is the output encoder 15-bit?
The motor-input encoder is 15-bit; the output-sensing encoder is 14-bit, or 16384 counts per output revolution. Motor counts multiplied by the gear ratio are a different quantity and should not be substituted for output-sensor resolution or positioning accuracy.
Can 28 Nm and 200 rpm be assumed together?
No. Those figures belong to different ratio conditions in the family. The size 14 ratio 100 row lists 28 Nm maximum torque and 60 rpm maximum speed. Verify the exact operating point and continuous-duty restrictions for the selected unit.
What is the price?
Request a quote for the complete size, ratio, connector orientation, I/O choice, cables and supply arrangement. No universal family price or fabricated sales offer is asserted.
What should commissioning prove?
Prove communication-mode behavior, direction, limits, position recovery, current protection and loaded thermal behavior. Include a controlled power interruption and verify the actual machine reference, rather than assuming that a valid actuator angle alone establishes the entire machine state.
Prices are indicative and may change. Confirm the final configuration, commercial terms and delivery schedule before ordering.
