Harmonic actuator
Harmonic Drive LPA low-profile actuator with integrated servo drive
A flat rotary actuator with zero-backlash strain wave gearing, a motor, dual absolute encoders and a 48 VDC servo drive built into one unit. It is controlled over CANopen or EtherCAT.
Key specifications
| Rated torque (max) | 16.9 Nm |
|---|---|
| Peak torque (max) | 57 Nm |
| Speed (max) | 88.2 rpm |
| Supply | 48 VDC nominal (24–60 VDC) |
| Ratio | 51–101:1 |
| Backlash (max) | 0 arcmin |
| Sizes | 20 |
Summarised in our own words from Harmonic Drive SE / Harmonic Drive LLC's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1
Notes on this data
Only LPA-20 is published, with ratios 51, 81 and 101. Peak torque is 34/49/57 Nm and rated 6.5/16 (ratio 81)/16.9 Nm. Maximum speed is 88.2/55.6/44.6 rpm. Communication is CANopen (DS301/DS402) or EtherCAT. Encoders are 15-bit on the motor and 14-bit on the output, both absolute. The unit is for indoor use only at 0–40 °C; no IP rating is given.
Specify Motion is not affiliated with Harmonic Drive SE / Harmonic Drive LLC. Harmonic Drive and LPA low-profile actuator with integrated servo drive are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a Harmonic Drive part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Hollow-shaft harmonic servo actuator: strain-wave gearing, motor, encoder and brake in one unit, run from a separate servo drive. Six frame sizes, from 48 VDC to 220 VAC.
| Published maximum | LPA low-profile actuator with integrated servo drive | MAH |
|---|---|---|
| Peak torque | 57 Nm | 800 Nm meets or exceeds |
| Rated torque | 16.9 Nm | 557 Nm meets or exceeds |
| Speed | 88.2 rpm | 125 rpm meets or exceeds |
Large-bore version of the harmonic actuator with a frameless 16-pole motor, giving a much bigger through-hole for cabling. Two sizes.
| Published maximum | LPA low-profile actuator with integrated servo drive | MAT |
|---|---|---|
| Peak torque | 57 Nm | 800 Nm meets or exceeds |
| Rated torque | 16.9 Nm | 557 Nm meets or exceeds |
| Speed | 88.2 rpm | 102 rpm meets or exceeds |
Harmonic actuator with an integrated German-made Synapticon Circulo servo drive on EtherCAT, with STO and optional FSoE functional safety.
| Published maximum | LPA low-profile actuator with integrated servo drive | MGM |
|---|---|---|
| Peak torque | 57 Nm | 459 Nm meets or exceeds |
| Rated torque | 16.9 Nm | 267 Nm meets or exceeds |
| Speed | 88.2 rpm | 108 rpm meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Other harmonic actuator series
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