Actuat · SA1
SA1
A compact metal-geared brushless servo actuator for small robot joints and dexterous mechanisms.
In development at Actuat. No production unit is available for sale.
- 01Brushless motor
- 02Metal reduction
- 03Output stage
- 04Position sensing
- 05Control electronics
- 06Aluminum housing
Product
What it is.
SA1 is Actuat's integrated servo programme: a brushless motor, compact metal transmission, sensing, motor control, and communications developed as one actuator. The programme is aimed at dense robotic mechanisms where mass, torque, backlash, thermal performance, and control bandwidth have to be designed together.
Specifications
Design targets, marked as such.
This is the first-pass engineering envelope for SA1. Values marked target are goals; TBD rows remain open until the design and test programme mature.
- Peak output torque
- ≥ 1.5N·mTGT
- No-load output speed
- ≥ 30rad/s @ 24 VTGT
- Operating voltage
- 12 – 24VTGT
- Package envelope
- ≤ 22 × 36 × 28mm targetTGT
- Mass
- ≤ 40gTGT
- Output position resolution
- ≥ 14bitTGT
Full specification table20
- Confirmed— A locked architectural decision
- Measured— From hardware, with stated conditions
- Simulated— Model output, not a specification
- Estimated— Calculated, not measured
- Manufacturer published— Third-party data, not independently verified
- Design target— Engineered toward
- Under evaluation— Options still open
- TBD— Not yet defined
Configuration
- Motor type
- Brushless motor
- Confirmed
The motor topology is selected; electromagnetic geometry remains open.
- Transmission
- Multi-stage metal gear train
- Design target
Final topology will follow backlash, efficiency, life, and packaging studies.
- Gear material
- Steel
- Design target
- Housing material
- Aluminum alloy
- Design target
- Gear ratio
- 250:1 – 300:1
- Under evaluation
Working range only. Ratio will be selected with the motor winding and output-speed target.
- Package envelope
- ≤ 22 × 36 × 28mm target
- Design target
- Mass
- ≤ 40g
- Design target
Electrical
- Operating voltage
- 12 – 24V
- Design target
The final range depends on driver selection and thermal validation.
- No-load current
- TBD
- TBD
Will be measured on prototypes at each supported bus voltage.
- Standby current
- TBD
- TBD
Controller and sensing architecture must be selected first.
Performance
- No-load output speed
- ≥ 30rad/s @ 24 V
- Design target
A programme target; not a measured capability.
- Continuous output torque
- TBD
- TBD
Requires a defined duty cycle and thermal boundary condition.
- Peak output torque
- ≥ 1.5N·m
- Design target
Target duration and winding-temperature limit are not yet defined.
- Output backlash
- TBD
- TBD
Will be specified after transmission tolerance and life studies.
Control and communication
- Position sensors
- Motor and output sensing
- Design target
Absolute encoder architecture is under evaluation.
- Output position resolution
- ≥ 14bit
- Design target
- Command interface
- Serial bus / CAN
- Under evaluation
The production interface and public protocol are not yet selected.
- Network topology
- Addressable multi-drop bus
- Design target
- Control modes
- Position, velocity, and torque
- Design target
Final limits and loop rates require hardware validation.
- Telemetry
- Position, velocity, current, voltage, and temperature
- Design target
Applications
Where it fits.
Robot joints
Compact actuation with position, velocity, and torque feedback.
Dexterous hands
Small, backdrivable drives for tightly packaged mechanisms.
Research and education
Instrumented hardware for controls, mechatronics, and embodied AI.
Robot competitions
Integrated motion hardware for fast prototype cycles.
Building something that needs to move well?
Tell us what the machine has to do.