SigGear Terminology and Units

Use these terms consistently across product pages, quotations, emails and technical discussions. A model-specific definition or test condition takes priority when explicitly stated.

Product Terms

Term	Controlled meaning
Robot joint actuator	A motor and transmission assembly for a robot joint; encoder and driver inclusion must be stated separately
Integrated joint module	A compact joint assembly combining multiple drive components; list the included motor, reducer, encoder, driver and brake explicitly
Planetary gearbox	A gear transmission using sun, planet and ring gears
Cycloidal joint module	A joint-drive assembly using a cycloidal pinwheel transmission
Micro gear motor	A compact motor and gearbox assembly; motor type, diameter, ratio and feedback must be identified for a specific selection
Hub gear motor	A geared motor arranged for compact wheel or hub-drive integration
Standard configuration	The published baseline configuration for a model; it does not include optional functions unless stated
Customer-specific configuration	A configuration defined by a quotation, drawing or technical agreement for one project

Performance Terms

Term	Controlled meaning
Rated torque	Output torque permitted under defined continuous or duty-rated conditions
Peak torque	Short-duration output torque subject to current, thermal and duty-cycle limits
Holding torque	Torque available while maintaining position under specified control and thermal conditions; not interchangeable with rated torque
Rated speed	Output speed associated with the stated rated operating point
No-load speed	Output speed measured without external working load under stated electrical conditions
Reduction ratio	Input speed divided by output speed, expressed as ratio:1
Backlash	Lost angular motion during direction reversal under a defined measurement method and load
Repeatability	Ability to return to the same position under repeated stated conditions
Accuracy	Difference between commanded or indicated position and actual position under a defined method
Radial load	Load acting perpendicular to the output axis
Axial load	Load acting along the output axis
Overturning moment	Bending moment applied to the output bearing or mounting structure
Duty cycle	Relationship between operating time, load states and rest time over a complete cycle
Backdrivability	Ability of an external output load to drive the mechanism backward under defined conditions

Electrical and Control Terms

Term	Controlled meaning
Operating voltage	Permitted supply-voltage range for the confirmed configuration
Rated current	Current associated with a defined rated operating point; distinguish bus current from phase current
Encoder	Position-sensing device; state whether it measures motor-side or output-side position and whether it is incremental or absolute
Driver	Power electronics and control hardware used to commutate and control the motor
FOC	Field-oriented control for a suitable motor and feedback configuration
CAN	Controller Area Network physical/data-link technology; protocol and command set still require confirmation
RS485	Differential serial physical layer; baud rate and application protocol require confirmation
EtherCAT	Industrial Ethernet fieldbus; availability must be confirmed for the selected driver and firmware
Closed-loop control	Control using measured feedback; identify the controlled variable, feedback location and loop implementation

Preferred Units and Formatting

Quantity	Preferred unit	Example
Torque	Nm	25 Nm
Speed	rpm	120 rpm
Power	W	500 W
Voltage	VDC	24–48 VDC
Current	A	12 A
Diameter and length	mm	80 mm
Mass below 1 kg	g	430 g
Mass at or above 1 kg	kg	1.2 kg
Backlash	arcmin	5–10 arcmin
Radial and axial force	N	500 N
Temperature	°C	25 °C

Use a space between a number and its unit. Use an en dash for ranges. Do not mix output-side and motor-side values without labeling them.