Harmonic Drive FLA Flat Brushless Actuators Review: Specs, Price and Applications
Updated: 4 days ago
Harmonic Drive FLA is a flat brushless actuator family offered with planetary HP gearing or strain-wave FB gearing and 24 V or 48 V winding choices. Its compact mechanical arrangement targets applications such as automated guided vehicle wheel drives and powered assist mechanisms, with an external compatible servo drive.
Quick Verdict
FLA is useful where axial space and moving mass matter, but the HP and FB versions address different torque-speed requirements. Choose the actual gearing, size, winding and feedback arrangement. The standard Hall-sensor counts and IP40 enclosure rating are important constraints for precision-positioning or exposed mobile applications.
Harmonic Drive FLA Flat Brushless Actuators at a Glance
Specification | Details |
Family | FLA brushless actuator; external drive required |
Sizes | 11, 14, 17 and 20 |
Gear alternatives | HP planetary; FB strain-wave reduction |
Winding alternatives | 24 VDC or 48 VDC |
HP continuous torque by size 11 /14 /17 /20 | 0.6 /1.2 /3.0 /4.1 Nm |
HP maximum speed by size 11 /14 /17 /20 | 500 /500 /500 /400 rpm; allowable continuous speed 100 rpm |
HP mass by size 11 /14 /17 /20 | 390 /620 /870 /1060 g |
FB size 17 ratio 50 /ratio 100 example | 7.9 /11.4 Nm allowable continuous torque;100 /50 rpm maximum speed |
Standard feedback and enclosure | Hall sensor; IP40; exact control suitability depends on drive and task |
Design and Engineering Assessment
A flat actuator can reduce the axial stack of a mechanism, but its benefit must be assessed with the output support, cabling and external drive. A short actuator body is not the same as a complete compact machine installation. Include maintenance access and any enclosure needed for the actual environment.
HP and FB are different transmission choices. The HP table supports higher output speeds with lower continuous torque than representative high-ratio FB configurations. Use a matched duty comparison: a faster planetary configuration and a higher-ratio strain-wave configuration should not be described as the same actuator with interchangeable headline ratings.
For an HP size 20, the current manufacturer table lists 12.1 Nm maximum torque and 4.1 Nm allowable continuous torque, with 400 rpm maximum speed but 100 rpm allowable continuous speed. Those separate limits show why a brief acceleration capability cannot establish sustained traction or sustained output speed.
The standard Hall feedback has relatively few counts compared with a precision absolute-encoder actuator. The HP output counts are listed as 240, 240, 270 and 432 per revolution across sizes 11 through 20. That is an interface and control consideration; a high gear ratio does not by itself establish precision positioning or repeatability.
HP Versus FB for the Real Duty
For battery-operated motion, begin with the complete torque-speed cycle, including starts, steady motion, stops and any holding periods. Compare this with the selected model's allowable continuous and maximum values. Do not infer that the listed maximum speed is continuously available simply because the motor can briefly reach it.
An FB size 17 ratio 50 example is listed with 7.9 Nm allowable continuous torque and 100 rpm maximum speed; ratio 100 changes those values to 11.4 Nm and 50 rpm. That tradeoff must remain attached to the ordering configuration. Select a gear ratio for the required operating point rather than only the largest torque.
Winding and Drive Selection
A24 Vwinding and a 48 Vwinding have different current requirements. Confirm the selected drive's motor configuration, Hall interface, current limits and supply behavior. Battery nominal voltage also changes with charging and discharge, so assess the actual permitted electrical operating range rather than equating a winding label with every possible supply condition.
The actuator requires a suitable external drive. A statement that third-party drives can be used does not establish compatibility with every feedback input or commutation setup. Verify phase ordering, sensor interpretation and protection before operating against a load.
Mechanical Loads and Environment
The manufacturer's table separately lists allowable moment loads. The radial position of a wheel or linkage can create an overturning moment that must be checked independently of output torque. Include the actual lever arm and external loads in the bearing and mounting assessment.
IP40 is not a washdown or waterproof rating. A mobile platform or wearable mechanism exposed to liquid, dust or cleaning needs an installation-level protection strategy appropriate to the actual environment. Do not transfer a higher ingress rating from another actuator family.
Safety and Acceptance for Assistance Equipment
An exoskeleton or rehabilitation application adds human-interaction requirements beyond motor torque. Assess the complete mechanism, control behavior, limits and response to power loss. A manufacturer-listed application is not evidence that a bare actuator certifies the final wearable or medical system.
Validate loaded temperature rise, command behavior and the required positioning result using the chosen drive. Include stops, reversals and the normal operating environment. Compare alternatives on that tested duty rather than treating gearing type or compactness as proof of overall performance.
Applications and Selection
Space-constrained rotary mechanisms, AGVwheel-drive concepts and powered-assistance equipment selected around the actual load cycle and enclosure requirements.
For Harmonic Drive FLA Flat Brushless 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
Flat motor-and-gear arrangement helps axial packaging
Planetary and strain-wave choices support different duty requirements
24 V and 48 V winding options suit configured battery systems
Published tables distinguish continuous and maximum limits
Limitations
External compatible drive is necessary
Hall feedback does not establish precision absolute positioning
IP40 requires attention to environmental exposure
Output-bearing moments and continuous-duty limits can govern selection
Who Should Consider Harmonic Drive FLA Flat Brushless Actuators?
Consider Harmonic Drive FLA Flat Brushless Actuators for space-constrained rotary mechanisms, AGVwheel-drive concepts and powered-assistance equipment selected around the actual load cycle and enclosure requirements. Establish the required operating point and installation interfaces before choosing the configuration, and use a representative loaded cycle as the acceptance basis.
Harmonic Drive FLA Flat Brushless Actuators FAQ
What is the FLA actuator family?
FLA combines a compact brushless motor with a selected reduction gear in a flat actuator arrangement. HP identifies planetary gearing and FB identifies strain-wave gearing. A compatible external drive is needed.
Which voltages are offered?
The manufacturer lists 24 VDC and 48 VDC windings. Choose the exact winding with the drive and actual supply operating range. The voltage label alone does not approve every battery voltage or charging condition.
How do HP and FB differ?
They use different reduction architectures and provide different torque-speed combinations. Compare the exact size and ratio at the required duty, including continuous torque and allowable continuous speed. Avoid mixing maxima from separate variants.
Can an HP size 20 run continuously at 400 rpm?
The table lists 400 rpm as maximum speed and 100 rpm as allowable continuous speed. It separately lists 12.1 Nm maximum torque and 4.1 Nm allowable continuous torque. Apply the correct duty conditions rather than treating all maxima as continuous ratings.
What feedback is standard?
The product table lists Hall sensors. The published output counts depend on the model and gearing; these counts are not a specification of complete machine accuracy. Verify that the feedback and selected drive support the required motion task.
Is FLA suitable for wet environments?
The published enclosure rating isIP40. Additional machine protection may be needed for liquid, dust, cleaning or outdoor exposure. Do not assume waterproof or washdown capability from the enclosed appearance.
What is the price?
Request a quote for the exact size, HP or FB gearing, ratio, winding and required drive or cables. Compare the full installed mechanism rather than assigning a universal price to the whole family.
What should an AGV or assistance-equipment trial verify?
Verify the loaded duty, thermal behavior, output loads, feedback control and response to stops or power loss. Human-interaction or mobile-system safety must be assessed for the complete machine; an actuator application example does not establish final-system compliance.
Prices are indicative and may change. Confirm the final configuration, commercial terms and delivery schedule before ordering.
